Patent Publication Number: US-2022228511-A1

Title: Combined cycle power device

Description:
FIELD 
     The present invention belongs to the flied of energy and power technology. 
     BACKGROUND 
     Cold demand, heat demand and power demand are common in human life and production. It is an important way to obtain and provide power by the conversion of thermal energy into mechanical energy. In general, the temperature of heat source reduces and varies with the release of heat. When fossil fuels are used as the primary energy, the heat source has the dual characteristics of both high-temperature and variable temperature. This makes it is difficult to transform more heat energy into mechanical energy using the power device based on a single thermal cycle. For high-quality fuel, the traditional gas-steam combined cycle can be used to obtain a high thermal efficiency. However, there are still some problems to be solved, such as high cost, large investment and low thermal efficiency to be improved. 
     Take the vapor power device with the outside combustion for example, its heat source has the dual characteristics of high-temperature and variable temperature. For those vapor power devices based on the Rankine cycle, the material&#39;s temperature resistance and pressure resistance abilities and safety concerns limit the parameters of the cycle&#39;s working medium. Therefore, there is a big temperature difference between the working medium and the heat source, which leads to big irreversible loss and low efficiency. This means that there is great potential to improve the thermal efficiency. 
     Humans need to use heat energy simply, actively, efficiently for achieving power. Therefore, the present invention provides a combined cycle power device with high thermal efficiency, strong safety, adaptation to high-temperature heat source or variable temperature heat source and response to various fuels. 
     THE CONTENTS OF THE PRESENT INVENTION 
     The combined cycle power device are mainly provided in the present invention, and the specific contents of the present invention are as follows: 
     1. A combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser and an evaporator. A condenser has a liquid refrigerant pipe which passes through a pump and connects an evaporator, an evaporator has a vapor channel connected the second expander, the second expander has a vapor channel which passes through the second high-temperature heat exchanger and connects a high-temperature heat exchanger, a compressor has a vapor channel connected the high-temperature heat exchanger, the high-temperature heat exchanger has a vapor channel connected an expander, the evaporator has a low-pressure vapor channel connected the compressor and the third expander respectively after that the expander has a low-pressure vapor channel connected the evaporator, the third expander has a low-pressure vapor channel connected the condenser. The high-temperature heat exchanger and the second high-temperature heat exchanger have the heat source medium channel connected the outside, the condenser has the cooling medium channel connected the outside, or the evaporator also has the heat source medium channel connected the outside. The expander, the second expander and the third expander connect the compressor and transmit power. Or the expander, the second expander and the third expander connect the compressor and the pump and transmit power. 
     2. A combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser and an evaporator. A condenser has a liquid refrigerant pipe which passes through a pump and connects an evaporator, an evaporator has a vapor channel connected the second expander, the second expander has a vapor channel which passes through the second high-temperature heat exchanger and connects a high-temperature heat exchanger, a compressor has a vapor channel connected the high-temperature heat exchanger, the high-temperature heat exchanger has a vapor channel connected an expander, the expander has a low-pressure vapor channel connected the second high-temperature heat exchanger, the evaporator has a low-pressure vapor channel connected the compressor and the third expander respectively after that the second high-temperature heat exchanger has a low-pressure vapor channel connected the evaporator, the third expander has a low-pressure vapor channel connected the condenser. The high-temperature heat exchanger has the heat source medium channel connected the outside, or the second high-temperature heat exchanger also has the heat source medium channel connected the outside, the condenser has the cooling medium channel connected the outside, or the evaporator also has the heat source medium channel connected the outside. The expander, the second expander and the third expander connect the compressor and transmit power. Or the expander, the second expander and the third expander connect the compressor and the pump and transmit power. 
     3. A combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser, an evaporator and a heating unit. A condenser has a liquid refrigerant pipe which passes through a pump and connects an evaporator, an evaporator has a vapor channel connected the second expander, the second expander has a vapor channel which passes through the second high-temperature heat exchanger and connects a high-temperature heat exchanger, a compressor has a vapor channel connected the high-temperature heat exchanger, the high-temperature heat exchanger has a vapor channel connected an expander, the heating unit has a low-pressure vapor channel connected the compressor and the third expander respectively after that expander has a low-pressure vapor channel connected a heating unit, the third expander has a low-pressure vapor channel connected the condenser. The high-temperature heat exchanger and the second high-temperature heat exchanger have the heat source medium channel connected the outside, the condenser has the cooling medium channel connected the outside, the evaporator has the heat source medium channel connected the outside, the heating unit has the heated medium channel connected the outside. The expander, the second expander and the third expander connect the compressor and transmit power. Or the expander, the second expander and the third expander connect the compressor and the pump and transmit power. 
     4. A combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser, an evaporator and a high-temperature regenerator. A condenser has a liquid refrigerant pipe which passes through a pump and connects an evaporator, the evaporator has a vapor channel connected the second expander, the second expander has a vapor channel which passes through the second high-temperature heat exchanger and a high-temperature regenerator and connects a high-temperature heat exchanger, a compressor has a vapor channel which passes through the high-temperature regenerator and connects the high-temperature heat exchanger, the high-temperature heat exchanger has a vapor channel connected an expander, the expander has a low-pressure vapor channel connected the high-temperature regenerator, the evaporator has a low-pressure vapor channel connected the compressor and the third expander respectively after that the high-temperature regenerator has a low-pressure vapor channel connected the evaporator, the third expander has a low-pressure vapor channel connected the condenser. The high-temperature heat exchanger and the second high-temperature heat exchanger have the heat source medium channel connected the outside, the condenser has the cooling medium channel connected the outside, or the evaporator also has the heat source medium channel connected the outside. The expander, the second expander and the third expander connect the compressor and transmit power. Or the expander, the second expander and the third expander connect the compressor and the pump and transmit power. 
     5. A combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser, an evaporator and a high-temperature regenerator. A condenser has a liquid refrigerant pipe which passes through a pump and connects an evaporator, the evaporator has a vapor channel connected the second expander, the second expander has a vapor channel which passes through the second high-temperature heat exchanger and a high-temperature regenerator and connects a high-temperature heat exchanger, a compressor has a vapor channel which passes through the high-temperature regenerator and connects the high-temperature heat exchanger, the high-temperature heat exchanger has a vapor channel connected an expander, the expander has a low-pressure vapor channel which passes through the high-temperature regenerator and connects the second high-temperature heat exchanger, the evaporator has a low-pressure vapor channel connected the compressor and the third expander respectively after that the second high-temperature heat exchanger has a low-pressure vapor channel connected the evaporator, the third expander has a low-pressure vapor channel connected the condenser. The high-temperature heat exchanger has the heat source medium channel connected the outside, or the second high-temperature heat exchanger also has the heat source medium channel connected the outside, the condenser has the cooling medium channel connected the outside, or the evaporator also has the heat source medium channel connected the outside. The expander, the second expander and the third expander connect the compressor and transmit power. Or the expander, the second expander and the third expander connect the compressor and the pump and transmit power. 
     6. A combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser and an evaporator. A condenser has a liquid refrigerant pipe which passes through a pump and connects an evaporator, the evaporator has a vapor channel connected the second expander, the second expander has a vapor channel which passes through the second high-temperature heat exchanger and connects an expander, a compressor has a vapor channel connected the high-temperature heat exchanger, the high-temperature heat exchanger has a vapor channel connected the expander, the evaporator has a low-pressure vapor channel connected the compressor and the third expander respectively after that the expander has a low-pressure vapor channel connected the evaporator, the third expander has a low-pressure vapor channel connected the condenser. The high-temperature heat exchanger and the second high-temperature heat exchanger have the heat source medium channel connected the outside, the condenser has the cooling medium channel connected the outside, or the evaporator also has the heat source medium channel connected the outside. The expander, the second expander and the third expander connect the compressor and transmit power. Or the expander, the second expander and the third expander connect the compressor and the pump and transmit power. 
     7. A combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser and an evaporator. A condenser has a liquid refrigerant pipe which passes through a pump and connects an evaporator, the evaporator has a vapor channel connected the second expander, the second expander has a vapor channel connected the second high-temperature heat exchanger, the second high-temperature heat exchanger has a vapor channel connected the expander, a compressor has a vapor channel which passes through the high-temperature heat exchanger and connects the expander, the evaporator has a low-pressure vapor channel connected the compressor and the third expander respectively after that the expander has a low-pressure vapor channel connected the evaporator, the third expander has a low-pressure vapor channel connected the condenser. The high-temperature heat exchanger and the second high-temperature heat exchanger have the heat source medium channel connected the outside, the condenser has the cooling medium channel connected the outside, or the evaporator also has the heat source medium channel connected the outside. The expander, the second expander and the third expander connect the compressor and transmit power. Or the expander, the second expander and the third expander connect the compressor and the pump and transmit power. 
     8. A combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser, an evaporator and a high-temperature regenerator. A condenser has a liquid refrigerant pipe which passes through a pump and connects an evaporator, the evaporator has a vapor channel connected the second expander, the second expander has a vapor channel connected the second high-temperature heat exchanger, the second high-temperature heat exchanger has a vapor channel connected the expander, a compressor has a vapor channel which passes through the high-temperature regenerator and the high-temperature heat exchanger and connects the expander, the expander has a low-pressure vapor channel connected the high-temperature regenerator, the evaporator has a low-pressure vapor channel connected the compressor and the third expander respectively after that the high-temperature regenerator has a low-pressure vapor channel connected the evaporator, the third expander has a low-pressure vapor channel connected the condenser. The high-temperature heat exchanger and the second high-temperature heat exchanger have the heat source medium channel connected the outside, the condenser has the cooling medium channel connected the outside, or the evaporator also has the heat source medium channel connected the outside. The expander, the second expander and the third expander connect the compressor and transmit power. Or the expander, the second expander and the third expander connect the compressor and the pump and transmit power. 
     9. A combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser, an evaporator and the fourth expander. A condenser has a liquid refrigerant pipe which passes through a pump and connects an evaporator, the evaporator has a vapor channel connected the second expander, the second expander has a vapor channel which passes through the second high-temperature heat exchanger and connects the fourth expander, the fourth expander has a low-pressure vapor channel connected the evaporator, a compressor has a vapor channel which passes through the high-temperature heat exchanger and connects an expander, the expander has a low-pressure vapor channel connected the evaporator, the evaporator has a low-pressure vapor channel connected the compressor and the third expander respectively, the third expander has a low-pressure vapor channel connected the condenser. The high-temperature heat exchanger and the second high-temperature heat exchanger have the heat source medium channel connected the outside, the condenser has the cooling medium channel connected the outside, or the evaporator also has the heat source medium channel connected the outside. The expander, the second expander, the third expander and the fourth expander connect the compressor and transmit power. Or the expander, the second expander, the third expander and the fourth expander connect the compressor and the pump and transmit power. 
     10. A combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser, an evaporator and a heating unit. A condenser has a liquid refrigerant pipe which passes through a pump and connects an evaporator, the evaporator has a vapor channel connected the second expander, the second expander has a vapor channel which passes through the second high-temperature heat exchanger and connects the high-temperature heat exchanger, a compressor has a vapor channel connected the high-temperature heat exchanger, the high-temperature heat exchanger has a vapor channel connected the expander, the evaporator has a low-pressure vapor channel connected a heating unit after that the expander has a low-pressure vapor channel connected the evaporator, the heating unit has a low-pressure vapor channel connected the compressor and the third expander respectively, the third expander has a low-pressure vapor channel connected the condenser. The high-temperature heat exchanger and the second high-temperature heat exchanger have the heat source medium channel connected the outside respectively, the condenser has the cooling medium channel connected the outside, the heating unit ( 10 ) has the heated medium channel connected the outside, or the evaporator also has the heat source medium channel connected the outside. The expander, the second expander and the third expander connect the compressor and transmit power. Or the expander, the second expander and the third expander connect the compressor and the pump and transmit power. 
     11. A combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser, an evaporator, the second compressor and the third high-temperature heat exchanger. A condenser has a liquid refrigerant pipe which passes through a pump and connects an evaporator, the evaporator has a vapor channel connected the second expander, the second expander has a vapor channel which passes through the second high-temperature heat exchanger and connects a high-temperature heat exchanger, a compressor has a vapor channel connected the high-temperature heat exchanger, the high-temperature heat exchanger has a vapor channel connected the second compressor, the second compressor has a vapor channel which passes through the third high-temperature heat exchanger and connects an expander, the expander has a low-pressure vapor channel connected the evaporator, the evaporator has a low-pressure vapor channel connected the compressor and the third expander respectively, the third expander has a low-pressure vapor channel connected the condenser. The high-temperature heat exchanger, the second high-temperature heat exchanger and the third high-temperature heat exchanger have the heat source medium channel connected the outside, the condenser has the cooling medium channel connected the outside, or the evaporator also has the heat source medium channel connected the outside. The expander, the second expander and the third expander connect the compressor and the second compressor and transmit power. Or the expander, the second expander and the third expander connect the compressor, the pump and the second compressor and transmit power. 
     12. A combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser, an evaporator, the fourth expander and the third high-temperature heat exchanger. A condenser has a liquid refrigerant pipe which passes through a pump and connects an evaporator, the evaporator has a vapor channel connected the second expander, the second expander has a vapor channel which passes through the second high-temperature heat exchanger and connects a high-temperature heat exchanger, a compressor has a vapor channel connected the high-temperature heat exchanger, the high-temperature heat exchanger has a vapor channel connected the fourth expander, the fourth expander has a vapor channel which passes through the third high-temperature heat exchanger and connects an expander, the expander has a low-pressure vapor channel connected the evaporator, the evaporator has a low-pressure vapor channel connected the compressor and the third expander respectively, the third expander has a low-pressure vapor channel connected the condenser. The high-temperature heat exchanger, the second high-temperature heat exchanger and the third high-temperature heat exchanger have the heat source medium channel connected the outside, the condenser has the cooling medium channel connected the outside, or the evaporator also has the heat source medium channel connected the outside. The expander, the second expander, the third expander and the fourth expander connect the compressor and transmit power. Or the expander, the second expander, the third expander and the fourth expander connect the compressor and the pump and transmit power. 
     13. A combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser, an evaporator, a high-temperature regenerator, the second compressor and the third high-temperature heat exchanger. A condenser has a liquid refrigerant pipe which passes through a pump and connects an evaporator, the evaporator has a vapor channel connected the second expander, the second expander has a vapor channel which passes through the second high-temperature heat exchanger and a high-temperature regenerator and connects a high-temperature heat exchanger, a compressor has a vapor channel which passes through the high-temperature regenerator the high-temperature heat exchanger, the high-temperature heat exchanger has a vapor channel connected the second compressor, the second compressor has a vapor channel which passes through the third high-temperature heat exchanger and connects an expander, the expander has a low-pressure vapor channel connected the high-temperature regenerator, the high-temperature regenerator has a low-pressure vapor channel connected the evaporator, the evaporator has a low-pressure vapor channel connected the compressor and the third expander respectively, the third expander has a low-pressure vapor channel connected the condenser. The high-temperature heat exchanger, the second high-temperature heat exchanger and the third high-temperature heat exchanger have the heat source medium channel connected the outside, the condenser has the cooling medium channel connected the outside, or the evaporator also has the heat source medium channel connected the outside. The expander, the second expander, the third expander and the fourth expander connect the compressor and the second compressor and transmit power. Or the expander, the second expander, the third expander and the fourth expander connect the compressor, the pump and the second compressor and transmit power. 
     14. A combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser, an evaporator, a high-temperature regenerator, the fourth expander and the third high-temperature heat exchanger. A condenser has a liquid refrigerant pipe which passes through a pump and connects an evaporator, the evaporator has a vapor channel connected the second expander, the second expander has a vapor channel which passes through the second high-temperature heat exchanger and a high-temperature regenerator and connects a high-temperature heat exchanger, a compressor has a vapor channel which passes through and a high-temperature regenerator and connects a high-temperature heat exchanger, the high-temperature heat exchanger has a vapor channel connected the fourth expander, the fourth expander has a vapor channel which passes through the third high-temperature heat exchanger and connects an expander, the expander has a low-pressure vapor channel connected the high-temperature regenerator, the high-temperature regenerator has a low-pressure vapor channel connected the evaporator, the evaporator has a low-pressure vapor channel connected the compressor and the third expander respectively, the third expander has a low-pressure vapor channel connected the condenser. The high-temperature heat exchanger, the second high-temperature heat exchanger and the third high-temperature heat exchanger have the heat source medium channel connected the outside, the condenser has the cooling medium channel connected the outside, or the evaporator also has the heat source medium channel connected the outside. The expander, the second expander, the third expander and the fourth expander connect the compressor and transmit power. Or the expander, the second expander, the third expander and the fourth expander connect the compressor and the pump and transmit power. 
     15. The device according to any one of claim  1 - 14 , wherein adding the low-temperature regenerator and the second pump, adjusting that the condenser has a liquid refrigerant pipe which passes through a pump and connects the evaporator to that the condenser has a liquid refrigerant pipe which passes through a pump and connects a low-temperature regenerator, the compressor adds the vapor extraction channel connected the low-temperature regenerator, the low-temperature regenerator has a liquid refrigerant pipe which passes through the second pump and connects the evaporator, a combined cycle power device is formed. 
    
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
         FIG. 1  is a type 1 example general flow chart of a combined cycle power device provided in the present invention. 
         FIG. 2  is a type 2 example general flow chart of a combined cycle power device provided in the present invention. 
         FIG. 3  is a type 3 example general flow chart of a combined cycle power device provided in the present invention. 
         FIG. 4  is a type 4 example general flow chart of a combined cycle power device provided in the present invention. 
         FIG. 5  is a type 5 example general flow chart of a combined cycle power device provided in the present invention. 
         FIG. 6  is a type 6 example general flow chart of a combined cycle power device provided in the present invention. 
         FIG. 7  is a type 7 example general flow chart of a combined cycle power device provided in the present invention. 
         FIG. 8  is a type 8 example general flow chart of a combined cycle power device provided in the present invention. 
         FIG. 9  is a type 9 example general flow chart of a combined cycle power device provided in the present invention. 
         FIG. 10  is a type 10 example general flow chart of a combined cycle power device provided in the present invention. 
         FIG. 11  is a type 11 example general flow chart of a combined cycle power device provided in the present invention. 
         FIG. 12  is a type 12 example general flow chart of a combined cycle power device provided in the present invention. 
         FIG. 13  is a type 13 example general flow chart of a combined cycle power device provided in the present invention. 
         FIG. 14  is a type 14 example general flow chart of a combined cycle power device provided in the present invention. 
         FIG. 15  is a type 15 example general flow chart of a combined cycle power device provided in the present invention. 
         FIG. 16  is a type 16 example general flow chart of a combined cycle power device provided in the present invention. 
         FIG. 17  is a type 17 example general flow chart of a combined cycle power device provided in the present invention. 
     
    
    
     In the figures,  1 —expander,  2 —the second expander,  3 —compressor,  4 —the third expander,  5 —pump,  6 —high-temperature heat exchanger,  7 —the second high-temperature heat exchanger,  8 —condenser,  9 —evaporator (waste heat boiler),  10 —heating unit,  11 —high-temperature regenerator,  12 —the fourth expander,  13 —the second compressor,  14 —the third high-temperature heat exchanger,  15 —low-temperature regenerator,  16 —the second pump. 
     What needs to be declared is: 
     (1) The above-mentioned expression “the expander, the second expander and the third expander connect the compressor and transmit power” mainly indicates that the power required by the compressor comes from the expander of the device itself rather than from the outside. The obvious connection method is that the four devices are coaxially connected together. 
     (2) Taking  FIG. 1  as an example, the work output by the expander is greater than the power required by the compressor generally. “The expander connects the compressor and transmits power”, combined with the expression “The expander supplies power to the compressor. And the expander, the second expander and the third expander supply power to the outside”, can also be used to replace “the expander, the second expander and the third expander connect the compressor and transmit power”. 
     (3) For the technical personnel in this field, the applicant believes that the expression “the expander, the second expander and the third expander connect the compressor and transmit power” is clear and will not cause trouble. 
     DETAILED DESCRIPTION 
     The first thing to note is that, when describing the cycle&#39;s structures and processes, the processes will not be repeatedly described if not necessary, and the obvious processes will not be described. The detailed description of the present invention is as follows: 
     The combined cycle power device in  FIG. 1  works as follows: 
     (1) Device structure. The combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser and an evaporator. A condenser  8  has a liquid refrigerant pipe which passes through a pump  5  and connects an evaporator  9 , an evaporator  9  has a vapor channel connected the second expander  2 , the second expander  2  has a vapor channel which passes through the second high-temperature heat exchanger  7  and connects a high-temperature heat exchanger  6 , a compressor  3  has a vapor channel connected the high-temperature heat exchanger  6 , the high-temperature heat exchanger  6  has a vapor channel connected an expander  1 , the evaporator  9  has a low-pressure vapor channel connected the compressor  3  and the third expander  4  respectively after that the expander  1  has a low-pressure vapor channel connected the evaporator  9 , the third expander  4  has a low-pressure vapor channel connected the condenser  8 . The high-temperature heat exchanger  6  and the second high-temperature heat exchanger  7  have the heat source medium channel connected the outside, the condenser  8  has the cooling medium channel connected the outside. The expander  1 , the second expander  2  and the third expander  4  connect the compressor  3  and transmit power. 
     (2) Working processes. The condensate of the condenser  8  flows through the pump  5  and enters into the evaporator  9  in which it absorbs heat, vaporizes and superheats, and then enters the second expander  2  to depressurize and output work. The vapor discharged from the second expander  2  flows through the second high-temperature heat exchanger  7  and the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the compressor  3  enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the high-temperature heat exchanger  6  flows through the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  flows through the evaporator  9  to release heat and cool down, and then is divided into two currents. The first current enters the compressor  3  for pressure rise and temperature rise. The second current flows through the third expander  4  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the second high-temperature heat exchanger  7 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3  and the outside. Or the expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3 , the pump  5  and the outside. The combined cycle power device is formed. 
     The combined cycle power device in  FIG. 2  works as follows: 
     (1) Device structure. The combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser and an evaporator. A condenser  8  has a liquid refrigerant pipe which passes through a pump  5  and connects an evaporator  9 , an evaporator  9  has a vapor channel connected the second expander  2 , the second expander  2  has a vapor channel which passes through the second high-temperature heat exchanger  7  and connects a high-temperature heat exchanger  6 , a compressor  3  has a vapor channel connected the high-temperature heat exchanger  6 , the high-temperature heat exchanger  6  has a vapor channel connected an expander  1 , the expander  1  has a low-pressure vapor channel connected the second high-temperature heat exchanger  7 , the evaporator  9  has a low-pressure vapor channel connected the compressor  3  and the third expander  4  respectively after that the second high-temperature heat exchanger  7  has a low-pressure vapor channel connected the evaporator  9 , the third expander  4  has a low-pressure vapor channel connected the condenser  8 . The high-temperature heat exchanger  6  has the heat source medium channel connected the outside, or the second high-temperature heat exchanger  7  also has the heat source medium channel connected the outside, the condenser  8  has the cooling medium channel connected the outside. The expander  1 , the second expander  2  and the third expander  4  connect the compressor  3  and transmit power. 
     (2) Working processes. The condensate of the condenser  8  flows through the pump  5  and enters into the evaporator  9  in which it absorbs heat, vaporizes and superheats, and then enters the second expander  2  to depressurize and output work. The vapor discharged from the second expander  2  flows through the second high-temperature heat exchanger  7  and the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the compressor  3  enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the high-temperature heat exchanger  6  flows through the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  flows through the second high-temperature heat exchanger  7  and the evaporator  9  to release heat and cool down, and then is divided into two currents. The first current enters the compressor  3  for pressure rise and temperature rise. The second current flows through the third expander  4  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3  and the outside. Or the expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3 , the pump  5  and the outside. The combined cycle power device is formed. 
     The combined cycle power device in  FIG. 3  works as follows: 
     Based on combined cycle power device in  FIG. 1 , the evaporator  9  adds the heat source medium channel connected the outside. The condensate entering the evaporator  9  obtains the heat load provided by the low-pressure vapor and the heat source medium at the same time, heats up, vaporizes and superheats, and then enters the second expander  2 . The combined cycle power device is formed. 
     The combined cycle power device in  FIG. 4  works as follows: 
     (1) Device structure. The combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser, an evaporator and a heating unit. A condenser  8  has a liquid refrigerant pipe which passes through a pump  5  and connects an evaporator  9 , an evaporator  9  has a vapor channel connected the second expander  2 , the second expander  2  has a vapor channel which passes through the second high-temperature heat exchanger  7  and connects a high-temperature heat exchanger  6 , a compressor  3  has a vapor channel connected the high-temperature heat exchanger  6 , the high-temperature heat exchanger  6  has a vapor channel connected an expander  1 , the heating unit  10  has a low-pressure vapor channel connected the compressor  3  and the third expander  4  respectively after that expander  1  has a low-pressure vapor channel connected a heating unit  10 , the third expander  4  has a low-pressure vapor channel connected the condenser  8 . The high-temperature heat exchanger  6  and the second high-temperature heat exchanger  7  have the heat source medium channel connected the outside, the condenser  8  has the cooling medium channel connected the outside, the evaporator  9  has the heat source medium channel connected the outside, the heating unit  10  has the heated medium channel connected the outside. The expander  1 , the second expander  2  and the third expander  4  connect the compressor  3  and transmit power. 
     (2) Working processes. The condensate of the condenser  8  flows through the pump  5  and enters into the evaporator  9  in which it absorbs heat, vaporizes and superheats, and then enters the second expander  2  to depressurize and output work. The vapor discharged from the second expander  2  flows through the second high-temperature heat exchanger  7  and the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the compressor  3  enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the high-temperature heat exchanger  6  flows through the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  flows through the heating unit  10  to release heat and cool down, and then is divided into two currents. The first current enters the compressor  3  for pressure rise and temperature rise. The second current flows through the third expander  4  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6 , the second high-temperature heat exchanger  7  and the evaporator  9 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The heated medium takes away the medium-temperature heat load through the heating unit  10 . The expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3  and the outside. Or the expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3 , the pump  5  and the outside. The combined cycle power device is formed. 
     The combined cycle power device in  FIG. 5  works as follows: 
     (1) Device structure. The combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser, an evaporator and a high-temperature regenerator. A condenser  8  has a liquid refrigerant pipe which passes through a pump  5  and connects an evaporator  9 , the evaporator  9  has a vapor channel connected the second expander  2 , the second expander  2  has a vapor channel which passes through the second high-temperature heat exchanger  7  and a high-temperature regenerator  11  and connects a high-temperature heat exchanger  6 , a compressor  3  has a vapor channel which passes through the high-temperature regenerator  11  and connects the high-temperature heat exchanger  6 , the high-temperature heat exchanger  6  has a vapor channel connected an expander  1 , the expander  1  has a low-pressure vapor channel connected the high-temperature regenerator  11 , the evaporator  9  has a low-pressure vapor channel connected the compressor  3  and the third expander  4  respectively after that the high-temperature regenerator  11  has a low-pressure vapor channel connected the evaporator  9 , the third expander  4  has a low-pressure vapor channel connected the condenser  8 . The high-temperature heat exchanger  6  and the second high-temperature heat exchanger  7  have the heat source medium channel connected the outside, the condenser  8  has the cooling medium channel connected the outsid. The expander  1 , the second expander  2  and the third expander  4  connect the compressor  3  and transmit power. 
     (2) Working processes. The condensate of the condenser  8  flows through the pump  5  and enters into the evaporator  9  in which it absorbs heat, vaporizes and superheats, and then enters the second expander  2  to depressurize and output work. The vapor discharged from the second expander  2  flows through the second high-temperature heat exchanger  7 , the high-temperature regenerator  11  and the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the compressor  3  flows through the high-temperature regenerator  11  and enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the high-temperature heat exchanger  6  flows through the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  flows through the high-temperature regenerator  11  and the evaporator  9  to release heat and cool down, and then is divided into two currents. The first current enters the compressor  3  for pressure rise and temperature rise. The second current flows through the third expander  4  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the second high-temperature heat exchanger  7 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3  and the outside. Or the expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3 , the pump  5  and the outside. The combined cycle power device is formed. 
     The combined cycle power device in  FIG. 6  works as follows: 
     (1) Device structure. The combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser, an evaporator and a high-temperature regenerator. A condenser  8  has a liquid refrigerant pipe which passes through a pump  5  and connects an evaporator  9 , the evaporator  9  has a vapor channel connected the second expander  2 , the second expander  2  has a vapor channel which passes through the second high-temperature heat exchanger  7  and a high-temperature regenerator  11  and connects a high-temperature heat exchanger  6 , a compressor  3  has a vapor channel which passes through the high-temperature regenerator  11  and connects the high-temperature heat exchanger  6 , the high-temperature heat exchanger  6  has a vapor channel connected an expander  1 , the expander  1  has a low-pressure vapor channel which passes through the high-temperature regenerator  11  and connects the second high-temperature heat exchanger  7 , the evaporator  9  has a low-pressure vapor channel connected the compressor  3  and the third expander  4  respectively after that the second high-temperature heat exchanger  7  has a low-pressure vapor channel connected the evaporator  9 , the third expander  4  has a low-pressure vapor channel connected the condenser  8 . The high-temperature heat exchanger  6  has the heat source medium channel connected the outside, or the second high-temperature heat exchanger  7  also has the heat source medium channel connected the outside, the condenser  8  has the cooling medium channel connected the outside. The expander  1 , the second expander  2  and the third expander  4  connect the compressor  3  and transmit power. 
     (2) Working processes. The condensate of the condenser  8  flows through the pump  5  and enters into the evaporator  9  in which it absorbs heat, vaporizes and superheats, and then enters the second expander  2  to depressurize and output work. The vapor discharged from the second expander  2  flows through the second high-temperature heat exchanger  7 , the high-temperature regenerator  11  and the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the compressor  3  flows through the high-temperature regenerator  11 , and enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the high-temperature heat exchanger  6  flows through the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  flows through the high-temperature regenerator  11 , the second high-temperature heat exchanger  7  and the evaporator  9  to release heat and cool down, and then is divided into two currents. The first current enters the compressor  3  for pressure rise and temperature rise. The second current flows through the third expander  4  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3  and the outside. Or the expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3 , the pump  5  and the outside. The combined cycle power device is formed. 
     The combined cycle power device in  FIG. 7  works as follows: 
     (1) Device structure. The combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser and an evaporator. A condenser  8  has a liquid refrigerant pipe which passes through a pump  5  and connects an evaporator  9 , the evaporator  9  has a vapor channel connected the second expander  2 , the second expander  2  has a vapor channel which passes through the second high-temperature heat exchanger  7  and connects an expander  1 , a compressor  3  has a vapor channel connected the high-temperature heat exchanger  6 , the high-temperature heat exchanger  6  has a vapor channel connected the expander  1 , the evaporator  9  has a low-pressure vapor channel connected the compressor  3  and the third expander  4  respectively after that the expander  1  has a low-pressure vapor channel connected the evaporator  9 , the third expander  4  has a low-pressure vapor channel connected the condenser  8 . The high-temperature heat exchanger  6  and the second high-temperature heat exchanger  7  have the heat source medium channel connected the outside, the condenser  8  has the cooling medium channel connected the outside. The expander  1 , the second expander  2  and the third expander  4  connect the compressor  3  and transmit power. 
     (2) Working processes. The condensate of the condenser  8  flows through the pump  5  and enters into the evaporator  9  in which it absorbs heat, vaporizes and superheats, and then enters the second expander  2  to depressurize and output work. The vapor discharged from the second expander  2  flows through the second high-temperature heat exchanger  7  for heat absorption and enters the expander  1  to depressurize and output work. The vapor discharged from the compressor  3  flows through the high-temperature heat exchanger  6  for heat absorption and enters the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  flows through the evaporator  9  to release heat and cool down, and then is divided into two currents. The first current enters the compressor  3  for pressure rise and temperature rise. The second current flows through the third expander  4  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the second high-temperature heat exchanger  7 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3  and the outside. Or the expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3 , the pump  5  and the outside. The combined cycle power device is formed. 
     The combined cycle power device in  FIG. 8  works as follows: 
     (1) Device structure. The combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser and an evaporator. A condenser  8  has a liquid refrigerant pipe which passes through a pump  5  and connects an evaporator  9 , the evaporator  9  has a vapor channel connected the second expander  2 , the second expander  2  has a vapor channel connected the second high-temperature heat exchanger  7 , the second high-temperature heat exchanger  7  has a vapor channel connected the expander  1 , a compressor  3  has a vapor channel which passes through the high-temperature heat exchanger  6  and connects the expander  1 , the evaporator  9  has a low-pressure vapor channel connected the compressor  3  and the third expander  4  respectively after that the expander  1  has a low-pressure vapor channel connected the evaporator  9 , the third expander  4  has a low-pressure vapor channel connected the condenser  8 . The high-temperature heat exchanger  6  and the second high-temperature heat exchanger  7  have the heat source medium channel connected the outside, the condenser  8  has the cooling medium channel connected the outside. The expander  1 , the second expander  2  and the third expander  4  connect the compressor  3  and transmit power. 
     (2) Working processes. The condensate of the condenser  8  flows through the pump  5  and enters into the evaporator  9  in which it absorbs heat, vaporizes and superheats, and then enters the second expander  2  to depressurize and output work. The vapor discharged from the second expander  2  flows through the second high-temperature heat exchanger  7  for heat absorption and enters the expander  1  through the medium vapor channel. The vapor discharged from the compressor  3  flows through the high-temperature heat exchanger  6  for heat absorption and enters the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  flows through the evaporator  9  to release heat and cool down, and then is divided into two currents. The first current enters the compressor  3  for pressure rise and temperature rise. The second current flows through the third expander  4  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the second high-temperature heat exchanger  7 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3  and the outside. Or the expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3 , the pump  5  and the outside. The combined cycle power device is formed. 
     The combined cycle power device in  FIG. 9  works as follows: 
     (1) Device structure. The combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser, an evaporator and a high-temperature regenerator. A condenser  8  has a liquid refrigerant pipe which passes through a pump  5  and connects an evaporator  9 , the evaporator  9  has a vapor channel connected the second expander  2 , the second expander  2  has a vapor channel connected the second high-temperature heat exchanger  7 , the second high-temperature heat exchanger  7  has a vapor channel connected the expander  1 , a compressor  3  has a vapor channel which passes through the high-temperature regenerator  11  and the high-temperature heat exchanger  6  and connects the expander  1 , the expander  1  has a low-pressure vapor channel connected the high-temperature regenerator  11 , the evaporator  9  has a low-pressure vapor channel connected the compressor  3  and the third expander  4  respectively after that the high-temperature regenerator  11  has a low-pressure vapor channel connected the evaporator  9 , the third expander  4  has a low-pressure vapor channel connected the condenser  8 . The high-temperature heat exchanger  6  and the second high-temperature heat exchanger  7  have the heat source medium channel connected the outside, the condenser  8  has the cooling medium channel connected the outside. The expander  1 , the second expander  2  and the third expander  4  connect the compressor  3  and transmit power. 
     (2) Working processes. The condensate of the condenser  8  flows through the pump  5  and enters into the evaporator  9  in which it absorbs heat, vaporizes and superheats, and then enters the second expander  2  to depressurize and output work. The vapor discharged from the second expander  2  flows through the second high-temperature heat exchanger  7  for heat absorption and enters the expander  1  through the medium vapor channel. The vapor discharged from the compressor  3  flows through the high-temperature regenerator  11  and the high-temperature heat exchanger  6  for heat absorption, and then enters the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  flows through the high-temperature regenerator  11  and the evaporator  9  to release heat and cool down, and then is divided into two currents. The first current enters the compressor  3  for pressure rise and temperature rise. The second current flows through the third expander  4  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the second high-temperature heat exchanger  7 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3  and the outside. Or the expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3 , the pump  5  and the outside. The combined cycle power device is formed. 
     The combined cycle power device in  FIG. 10  works as follows: 
     (1) Device structure. The combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser, an evaporator and the fourth expander. A condenser  8  has a liquid refrigerant pipe which passes through a pump  5  and connects an evaporator  9 , the evaporator  9  has a vapor channel connected the second expander  2 , the second expander  2  has a vapor channel which passes through the second high-temperature heat exchanger  7  and connects the fourth expander  12 , the fourth expander  12  has a low-pressure vapor channel connected the evaporator  9 , a compressor  3  has a vapor channel which passes through the high-temperature heat exchanger  6  and connects an expander  1 , the expander  1  has a low-pressure vapor channel connected the evaporator  9 , the evaporator  9  has a low-pressure vapor channel connected the compressor  3  and the third expander  4  respectively, the third expander  4  has a low-pressure vapor channel connected the condenser  8 . The high-temperature heat exchanger  6  and the second high-temperature heat exchanger  7  have the heat source medium channel connected the outside, the condenser  8  has the cooling medium channel connected the outside. The expander  1 , the second expander  2 , the third expander  4  and the fourth expander  12  connect the compressor  3  and transmit power. 
     (2) Working processes. The condensate of the condenser  8  flows through the pump  5  and enters into the evaporator  9  in which it absorbs heat, vaporizes and superheats, and then enters the second expander  2  to depressurize and output work. The vapor discharged from the second expander  2  flows through the second high-temperature heat exchanger  7  for heat absorption and enters the fourth expander  12  to depressurize and output work. The low-pressure vapor discharged from the fourth expander  12  enters the evaporator  9  to release heat and cool down. The vapor discharged from the compressor  3  flows through the high-temperature heat exchanger  6  for heat absorption, and then enters the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  enters the evaporator  9  to release heat and cool down, and then is divided into two currents. The first current enters the compressor  3  for pressure rise and temperature rise. The second current flows through the third expander  4  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6 , the second high-temperature heat exchanger  7  and the evaporator  9 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The expander  1 , the second expander  2 , the third expander  4  and the fourth expander  12  supplies power to the compressor  3  and the outside. Or the expander  1 , the second expander  2 , the third expander  4  and the fourth expander  12  supplies power to the compressor  3 , the pump  5  and the outside. The combined cycle power device is formed. 
     The combined cycle power device in  FIG. 11  works as follows: 
     (1) Device structure. The combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser, an evaporator and a heating unit. A condenser  8  has a liquid refrigerant pipe which passes through a pump  5  and connects an evaporator  9 , the evaporator  9  has a vapor channel connected the second expander  2 , the second expander  2  has a vapor channel which passes through the second high-temperature heat exchanger  7  and connects the high-temperature heat exchanger  6 , a compressor  3  has a vapor channel connected the high-temperature heat exchanger  6 , the high-temperature heat exchanger  6  has a vapor channel connected the expander  1 , the evaporator  9  has a low-pressure vapor channel connected a heating unit  10  after that the expander  1  has a low-pressure vapor channel connected the evaporator  9 , the heating unit  10  has a low-pressure vapor channel connected the compressor  3  and the third expander  4  respectively, the third expander  4  has a low-pressure vapor channel connected the condenser  8 . The high-temperature heat exchanger  6  and the second high-temperature heat exchanger  7  have the heat source medium channel connected the outside, the condenser  8  has the cooling medium channel connected the outside. The expander  1 , the second expander  2  and the third expander  4  connect the compressor  3  and transmit power. 
     (2) Working processes. The condensate of the condenser  8  flows through the pump  5  and enters into the evaporator  9  in which it absorbs heat, vaporizes and superheats, and then enters the second expander  2  to depressurize and output work. The vapor discharged from the second expander  2  flows through the second high-temperature heat exchanger  7  and the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the compressor  3  enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the high-temperature heat exchanger  6  flows through the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  flows through the evaporator  9  and the heating unit  10  to release heat and cool down, and then is divided into two currents. The first current enters the compressor  3  for pressure rise and temperature rise. The second current flows through the third expander  4  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the second high-temperature heat exchanger  7 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The heated medium takes away the medium-temperature heat load through the heating unit  10 . The expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3  and the outside. Or the expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3 , the pump  5  and the outside. The combined cycle power device is formed. 
     The combined cycle power device in  FIG. 12  works as follows: 
     (1) Device structure. The combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser, an evaporator, the second compressor and the third high-temperature heat exchanger. A condenser  8  has a liquid refrigerant pipe which passes through a pump  5  and connects an evaporator  9 , the evaporator  9  has a vapor channel connected the second expander  2 , the second expander  2  has a vapor channel which passes through the second high-temperature heat exchanger  7  and connects a high-temperature heat exchanger  6 , a compressor  3  has a vapor channel connected the high-temperature heat exchanger  6 , the high-temperature heat exchanger  6  has a vapor channel connected the second compressor  13 , the second compressor  13  has a vapor channel which passes through the third high-temperature heat exchanger  14  and connects an expander  1 , the expander  1  has a low-pressure vapor channel connected the evaporator  9 , the evaporator  9  has a low-pressure vapor channel connected the compressor  3  and the third expander  4  respectively, the third expander  4  has a low-pressure vapor channel connected the condenser  8 . The high-temperature heat exchanger  6 , the second high-temperature heat exchanger  7  and the third high-temperature heat exchanger  14  have the heat source medium channel connected the outside, the condenser  8  has the cooling medium channel connected the outside. The expander  1 , the second expander  2  and the third expander  4  connect the compressor  3  and the second compressor  13  and transmit power. 
     (2) Working processes. The condensate of the condenser  8  flows through the pump  5  and enters into the evaporator  9  in which it absorbs heat, vaporizes and superheats, and then enters the second expander  2  to depressurize and output work. The vapor discharged from the second expander  2  flows through the second high-temperature heat exchanger  7  and the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the compressor  3  enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the high-temperature heat exchanger  6  flows through the second compressor  13  for pressure rise and temperature rise, flows through the third expander  4  for heat absorption, and flows through the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  flows through the evaporator  9  to release heat and cool down, and then is divided into two currents. The first current enters the compressor  3  for pressure rise and temperature rise. The second current flows through the third expander  4  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6 , the second high-temperature heat exchanger  7  and the third high-temperature heat exchanger  14 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3 , the second compressor  13  and the outside. Or the expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3 , the pump  5 , the second compressor  13  and the outside. The combined cycle power device is formed. 
     The combined cycle power device in  FIG. 13  works as follows: 
     (1) Device structure. The combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser, an evaporator, the fourth expander and the third high-temperature heat exchanger. A condenser  8  has a liquid refrigerant pipe which passes through a pump  5  and connects an evaporator  9 , the evaporator  9  has a vapor channel connected the second expander  2 , the second expander  2  has a vapor channel which passes through the second high-temperature heat exchanger  7  and connects a high-temperature heat exchanger  6 , a compressor  3  has a vapor channel connected the high-temperature heat exchanger  6 , the high-temperature heat exchanger  6  has a vapor channel connected the fourth expander  12 , the fourth expander  12  has a vapor channel which passes through the third high-temperature heat exchanger  14  and connects an expander  1 , the expander  1  has a low-pressure vapor channel connected the evaporator  9 , the evaporator  9  has a low-pressure vapor channel connected the compressor  3  and the third expander  4  respectively, the third expander  4  has a low-pressure vapor channel connected the condenser  8 . The high-temperature heat exchanger  6 , the second high-temperature heat exchanger  7  and the third high-temperature heat exchanger  14  have the heat source medium channel connected the outside, the condenser  8  has the cooling medium channel connected the outside. The expander  1 , the second expander  2 , the third expander  4  and the fourth expander  12  connect the compressor  3  and transmit power. 
     (2) Working processes. The condensate of the condenser  8  flows through the pump  5  and enters into the evaporator  9  in which it absorbs heat, vaporizes and superheats, and then enters the second expander  2  to depressurize and output work. The vapor discharged from the second expander  2  flows through the second high-temperature heat exchanger  7  and the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the compressor  3  enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the high-temperature heat exchanger  6  flows through the fourth expander  12  to depressurize and output work, flows through the third high-temperature heat exchanger  14  for heat absorption, and flows through the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  flows through the evaporator  9  to release heat and cool down, and then is divided into two currents. The first current enters the compressor  3  for pressure rise and temperature rise. The second current flows through the third expander  4  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6 , the second high-temperature heat exchanger  7  and the third high-temperature heat exchanger  14 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The expander  1 , the second expander  2 , the third expander  4  and the fourth expander  12  supplies power to the compressor  3  and the outside. Or the expander  1 , the second expander  2 , the third expander  4  and the fourth expander  12  supplies power to the compressor  3 , the pump  5  and the outside. The combined cycle power device is formed. 
     The combined cycle power device in  FIG. 14  works as follows: 
     (1) Device structure. The combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser, an evaporator, a high-temperature regenerator, the second compressor and the third high-temperature heat exchanger. A condenser  8  has a liquid refrigerant pipe which passes through a pump  5  and connects an evaporator  9 , the evaporator  9  has a vapor channel connected the second expander  2 , the second expander  2  has a vapor channel which passes through the second high-temperature heat exchanger  7  and a high-temperature regenerator  11  and connects a high-temperature heat exchanger  6 , a compressor  3  has a vapor channel which passes through the high-temperature regenerator  11  the high-temperature heat exchanger  6 , the high-temperature heat exchanger  6  has a vapor channel connected the second compressor  13 , the second compressor  13  has a vapor channel which passes through the third high-temperature heat exchanger  14  and connects an expander  1 , the expander  1  has a low-pressure vapor channel connected the high-temperature regenerator  11 , the high-temperature regenerator  11  has a low-pressure vapor channel connected the evaporator  9 , the evaporator  9  has a low-pressure vapor channel connected the compressor  3  and the third expander  4  respectively, the third expander  4  has a low-pressure vapor channel connected the condenser  8 . The high-temperature heat exchanger  6 , the second high-temperature heat exchanger  7  and the third high-temperature heat exchanger  14  have the heat source medium channel connected the outside, the condenser  8  has the cooling medium channel connected the outside. The expander  1 , the second expander  2 , the third expander  4  and the fourth expander  12  connect the compressor  3  and the second compressor  13  and transmit power. 
     (2) Working processes. The condensate of the condenser  8  flows through the pump  5  and enters into the evaporator  9  in which it absorbs heat, vaporizes and superheats, and then enters the second expander  2  to depressurize and output work. The vapor discharged from the second expander  2  flows through the second high-temperature heat exchanger  7  and the high-temperature regenerator  11 , and then enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the high-temperature heat exchanger  6  flows through the second compressor  13  for pressure rise and temperature rise, flows through the third high-temperature heat exchanger  14  for heat absorption, and flows through the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  flows through the high-temperature regenerator  11  and the evaporator  9  to release heat and cool down, and then is divided into two currents. The first current enters the compressor  3  for pressure rise and temperature rise. The second current flows through the third expander  4  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6 , the second high-temperature heat exchanger  7  and the third high-temperature heat exchanger  14 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3 , the second compressor  13  and the outside. Or the expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3 , the pump  5 , the second compressor  13  and the outside. The combined cycle power device is formed. 
     The combined cycle power device in  FIG. 15  works as follows: 
     (1) Device structure. The combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser, an evaporator, a high-temperature regenerator, the fourth expander and the third high-temperature heat exchanger. A condenser  8  has a liquid refrigerant pipe which passes through a pump  5  and connects an evaporator  9 , the evaporator  9  has a vapor channel connected the second expander  2 , the second expander  2  has a vapor channel which passes through the second high-temperature heat exchanger  7  and a high-temperature regenerator  11  and connects a high-temperature heat exchanger  6 , the high-temperature heat exchanger  6  has a vapor channel connected the fourth expander  12 , the fourth expander  12  has a vapor channel which passes through the third high-temperature heat exchanger  14  and connects an expander  1 , the expander  1  has a low-pressure vapor channel connected the high-temperature regenerator  11 , the high-temperature regenerator  11  has a low-pressure vapor channel connected the evaporator  9 , the evaporator  9  has a low-pressure vapor channel connected the compressor  3  and the third expander  4  respectively, the third expander  4  has a low-pressure vapor channel connected the condenser  8 . The high-temperature heat exchanger  6 , the second high-temperature heat exchanger  7  and the third high-temperature heat exchanger  14  have the heat source medium channel connected the outside, the condenser  8  has the cooling medium channel connected the outside. The expander  1 , the second expander  2 , the third expander  4  and the fourth expander  12  connect the compressor  3  and transmit power. 
     (2) Working processes. The condensate of the condenser  8  flows through the pump  5  and enters into the evaporator  9  in which it absorbs heat, vaporizes and superheats, and then enters the second expander  2  to depressurize and output work. The vapor discharged from the second expander  2  flows through the second high-temperature heat exchanger  7  and the high-temperature regenerator  11 , and then enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the high-temperature heat exchanger  6  flows through the fourth expander  12  to depressurize and output work, flows through the third high-temperature heat exchanger  14  for heat absorption, and flows through the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  flows through the high-temperature regenerator  11  and the evaporator  9  to release heat and cool down, and then is divided into two currents. The first current enters the compressor  3  for pressure rise and temperature rise. The second current flows through the third expander  4  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6 , the second high-temperature heat exchanger  7  and the third high-temperature heat exchanger  14 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The expander  1 , the second expander  2 , the third expander  4  and the fourth expander  12  supplies power to the compressor  3  and the outside. Or the expander  1 , the second expander  2 , the third expander  4  and the fourth expander  12  supplies power to the compressor  3 , the pump  5  and the outside. The combined cycle power device is formed. 
     The combined cycle power device in  FIG. 16  works as follows: 
     (1) Device structure. Based on the combined cycle power device in  FIG. 1 , a low-temperature regenerator and the second pump are added. That the condenser  8  has the liquid refrigerant pipe which passes through the pump  5  and connects the evaporator  9  is adjusted for that the condenser  8  has the liquid refrigerant pipe which passes through the pump  5  and connects a low-temperature regenerator  15 . The compressor  3  adds a vapor extraction channel connected the low-temperature regenerator  15 . The low-temperature regenerator  15  has a liquid refrigerant pipe which passes through the second pump  16  and connects the evaporator  9 . 
     (2) Working processes. The condensate of the condenser  8  flows through the pump  5  and enters the low-temperature regenerator  15  in which it mixes with the vapor extraction from the compressor  3  for heat absorption. The vapor extraction releases and is condensed. The condensate of the low-temperature regenerator  15  flows through the second pump  16  and enters the evaporator  9  in which it absorbs heat, vaporizes and superheats, flows through the second expander  2  to depressurize and output work, flows through the second high-temperature heat exchanger  7  for heat absorption, and then enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from compressor  3  enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the high-temperature heat exchanger  6  flows through the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  flows through the evaporator  9  to release heat and cool down, and then is divided into two currents. The first current enters the compressor  3 . The second current flows through the third expander  4  to depressurize and output work, and then enters the condenser  8  to release heat and condense. The low-pressure vapor entering the compressor  3  is compressed to the certain extent and then divided into two currents. The first current enters the low-temperature regenerator  15  by the intermediate extraction channel. The second current continues to boost pressure and temperature. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the second high-temperature heat exchanger  7 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3  and the outside. Or the expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3 , the pump  5 , the second pump  16  and the outside. The combined cycle power device is formed. 
     The combined cycle power device in  FIG. 17  works as follows: 
     (1) Device structure. Based on the combined cycle power device in  FIG. 4 , a low-temperature regenerator and the second pump are added. That the condenser  8  has the liquid refrigerant pipe which passes through the pump  5  and connects the evaporator  9  is adjusted for that the condenser  8  has the liquid refrigerant pipe which passes through the pump  5  and connects a low-temperature regenerator  15 . The compressor  3  adds a vapor extraction channel connected the low-temperature regenerator  15 . The low-temperature regenerator  15  has a liquid refrigerant pipe which passes through the second pump  16  and connects the evaporator  9 . 
     (2) Working processes. The condensate of the condenser  8  flows through the pump  5  and enters the low-temperature regenerator  15  in which it mixes with the vapor extraction from the compressor  3  for heat absorption. The vapor extraction releases and is condensed. The condensate of the low-temperature regenerator  15  flows through the second pump  16  and enters the evaporator  9  in which it absorbs heat, vaporizes and superheats, flows through the second expander  2  to depressurize and output work, flows through the second high-temperature heat exchanger  7  for heat absorption, and then enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from compressor  3  enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the high-temperature heat exchanger  6  flows through the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  flows through the heating unit  10  to release heat and cool down, and then is divided into two currents. The first current enters the compressor  3 . The second current flows through the third expander  4  to depressurize and output work, and then enters the condenser  8  to release heat and condense. The low-pressure vapor entering the compressor  3  is compressed to the certain extent and then divided into two currents. The first current enters the low-temperature regenerator  15  by the intermediate extraction channel. The second current continues to boost pressure and temperature. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6 , the second high-temperature heat exchanger  7  and the evaporator  9 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The heated medium takes away the medium-temperature heat load through the heating unit  10 . The expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3  and the outside. Or the expander  1 , the second expander  2  and the third expander  4  supplies power to the compressor  3 , the pump  5 , the second pump  16  and the outside. The combined cycle power device is formed. 
     The technical effects of the present invention: the combined cycle power device proposed by the present invention has the following effects and advantages: 
     (1) The circulating working medium absorbs heat at high-temperature heat under low pressure. The temperature difference loss between the circulating working medium and the high-temperature heat source is small, which is conducive to improving the thermal efficiency of the system and the safety of the device. 
     (2) The circulating working medium mainly relies on the condensation phase transformation process to realize low-temperature heat release. The temperature difference loss between the circulating working medium and the environment is controllable, which is conducive to improving the thermal efficiency. 
     (3) The present invention adopts the low-pressure and high-temperature operation mode to work in the high-temperature region. Therefore, the contradiction among thermal efficiency, the working medium&#39;s parameters and the material&#39;s temperature resistance and pressure resistance abilities, which is common in traditional vapor power devices, can be resolved. The temperature difference loss between the heat source and the circulating medium can be greatly reduced, and the thermal efficiency can be greatly improved. 
     (4) In the present invention, the equipment is shared to increase the heat absorption process of the lower cycle (Rankine cycle) and improve the thermal efficiency. 
     (5) The present invention only uses a single working medium, which reduce the operation cost and improve the flexibility of thermal device. 
     (6) When the high-temperature expander is shared, the number of core equipment is reduced, which is conducive to reducing system investment and improving thermal efficiency. 
     (7) The present invention adopts three expansion and double heat absorption processes in the lower cycle, which is conducive to flexible adjustment of working parameters and adaptability. 
     (8) The present invention effectively deals with the high-temperature heat source and the variable temperature heat source, the high-quality fuel and the non high-quality fuel, and has a wide range of application. 
     (9) On the premise of realizing high thermal efficiency, the device in the present invention can be selected to operate at low pressure, so as to greatly improve the operation safety of the device. 
     (10) The present invention can realize the heat recovery of enterprise device simply, actively, safely and efficiently. 
     (11) The thermal efficiency improves effectively when the present invention is applied to the lower end of the gas-steam combined cycle. 
     (12) When the present invention is applied to the coal-fired thermal system, it can maintain the original advantages of the traditional steam power cycle in which water vapor is used as working medium and has a wide range of working parameters. According to the actual situation, the present invention can work in subcritical, critical, supercritical or ultra supercritical state, etc.