Patent Publication Number: US-2022213819-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 comprising an expander, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser and a mixed evaporator. A condenser has a liquid refrigerant pipe which passes through a pump and connects a mixed evaporator, an expander has a low-pressure vapor channel connected the mixed evaporator, the mixed evaporator has a low-pressure vapor channel connected a compressor, the mixed evaporator has a low-pressure vapor channel which passes through the second expander and connects the condenser, the compressor has a vapor channel connected a high-temperature heat exchanger, a high-temperature evaporator has a vapor channel connected the high-temperature heat exchanger after that the condenser has a liquid refrigerant pipe which passes through the second pump and connects the high-temperature evaporator, the high-temperature heat exchanger has a vapor channel connected the expander. The high-temperature heat exchanger and the high-temperature evaporator have the heat source medium channel connected the outside respectively, the condenser has the cooling medium channel connected the outside, or the mixed evaporator also has the heat source medium channel connected the outside, the expander connects the compressor and transmits power. Or the expander connects the compressor, the pump and the second pump and transmits power. 
     2. A combined cycle power device comprising an expander, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser and a mixed evaporator. A condenser has a liquid refrigerant pipe which passes through a pump and connects a mixed evaporator, an expander has a low-pressure vapor channel which passes through a high-temperature evaporator and connects the mixed evaporator, the mixed evaporator has a low-pressure vapor channel connected a compressor, the mixed evaporator has a low-pressure vapor channel which passes through the second expander and connects the condenser, the compressor has a vapor channel connected a high-temperature heat exchanger, the high-temperature evaporator has a vapor channel connected the high-temperature heat exchanger after that the condenser has a liquid refrigerant pipe which passes through the second pump and connects the high-temperature evaporator, the high-temperature heat exchanger has a vapor channel connected the expander. The high-temperature heat exchanger has the heat source medium channel connected the outside, or the high-temperature evaporator also has the heat source medium channel connected the outside, the condenser has the cooling medium channel connected the outside, or the mixed evaporator also has the heat source medium channel connected the outside, the expander connects the compressor and transmits power. Or the expander connects the compressor, the pump and the second pump and transmits power. 
     3. A combined cycle power device comprising an expander, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser, a mixed evaporator and a heating unit. A condenser has a liquid refrigerant pipe which passes through a pump and connects a mixed evaporator, an expander has a low-pressure vapor channel which passes through a heating unit and connects the mixed evaporator, the mixed evaporator has a low-pressure vapor channel connected a compressor, the mixed evaporator has a low-pressure vapor channel which passes through the second expander and connects the condenser, the compressor has a vapor channel connected a high-temperature heat exchanger, the high-temperature evaporator has a vapor channel connected the high-temperature heat exchanger after that the condenser has a liquid refrigerant pipe which passes through the second pump and connects the high-temperature evaporator, the high-temperature heat exchanger has a vapor channel connected the expander. The high-temperature heat exchanger and the high-temperature evaporator have the heat source medium channel connected the outside respectively, the condenser has the cooling medium channel connected the outside, or the mixed evaporator also has the heat source medium channel connected the outside, the heating unit has the heated medium channel connected the outside, the expander connects the compressor and transmits power. Or the expander connects the compressor, the pump and the second pump and transmits power. 
     4. A combined cycle power device comprising an expander, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser, a mixed evaporator and a heating unit. A condenser has a liquid refrigerant pipe which passes through a pump and connects a mixed evaporator, an expander has a low-pressure vapor channel which passes through a high-temperature evaporator and a heating unit and connects the mixed evaporator, the mixed evaporator has a low-pressure vapor channel connected a compressor, the mixed evaporator has a low-pressure vapor channel which passes through the second expander and connects the condenser, the compressor has a vapor channel connected a high-temperature heat exchanger, the high-temperature evaporator has a vapor channel connected the high-temperature heat exchanger after that the condenser has a liquid refrigerant pipe which passes through the second pump and connects the high-temperature evaporator, the high-temperature heat exchanger has a vapor channel connected the expander. The high-temperature heat exchanger has the heat source medium channel connected the outside, or the high-temperature evaporator also has the heat source medium channel connected the outside, the condenser has the cooling medium channel connected the outside, or the mixed evaporator also has the heat source medium channel connected the outside, the heating unit has the heated medium channel connected the outside, the expander connects the compressor and transmits power. Or the expander connects the compressor, the pump and the second pump and transmits power. 
     5. A combined cycle power device comprising an expander, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser and a mixed evaporator. A condenser has a liquid refrigerant pipe which passes through a pump and connects a mixed evaporator, an expander has a low-pressure vapor channel connected the mixed evaporator, the mixed evaporator has a low-pressure vapor channel connected a compressor, the mixed evaporator has a low-pressure vapor channel which passes through the second expander and connects the condenser, the compressor has a vapor channel connected a high-temperature heat exchanger, the high-temperature heat exchanger has a vapor channel connected the expander through a intermediate vapor inlet channel, the condenser has a liquid refrigerant pipe which passes through the second pump and connects a high-temperature evaporator, the high-temperature evaporator has a vapor channel connected the expander. The high-temperature heat exchanger and the high-temperature evaporator have the heat source medium channel connected the outside respectively, the condenser has the cooling medium channel connected the outside, or the mixed evaporator also has the heat source medium channel connected the outside, the expander connects the compressor and transmits power. Or the expander connects the compressor, the pump and the second pump and transmits power. 
     6. A combined cycle power device comprising an expander, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser and a mixed evaporator. A condenser has a liquid refrigerant pipe which passes through a pump and connects a mixed evaporator, an expander has a low-pressure vapor channel connected the mixed evaporator, the mixed evaporator has a low-pressure vapor channel connected a compressor, the mixed evaporator has a low-pressure vapor channel which passes through the second expander and connects the condenser, the compressor has a vapor channel connected a high-temperature heat exchanger, the high-temperature heat exchanger has a vapor channel connected the expander, the condenser has a liquid refrigerant pipe which passes through the second pump and connects a high-temperature evaporator, the high-temperature evaporator has a vapor channel connected the expander through a intermediate vapor inlet channel The high-temperature heat exchanger and the high-temperature evaporator have the heat source medium channel connected the outside respectively, the condenser has the cooling medium channel connected the outside, or the mixed evaporator also has the heat source medium channel connected the outside, the expander connects the compressor and transmits power. Or the expander connects the compressor, the pump and the second pump and transmits power. 
     7. A combined cycle power device comprising an expander, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser and a mixed evaporator. A condenser has a liquid refrigerant pipe which passes through a pump and connects a mixed evaporator, an expander has a low-pressure vapor channel which passes through a high-temperature evaporator and connects the mixed evaporator, the mixed evaporator has a low-pressure vapor channel connected a compressor, the mixed evaporator has a low-pressure vapor channel which passes through the second expander and connects the condenser, the compressor has a vapor channel connected a high-temperature heat exchanger, the high-temperature heat exchanger has a vapor channel connected the expander through a intermediate vapor inlet channel, the condenser has a liquid refrigerant pipe which passes through the second pump and connects the high-temperature evaporator, the high-temperature evaporator has a vapor channel connected the expander. The high-temperature heat exchanger has the heat source medium channel connected the outside, or the high-temperature evaporator also has the heat source medium channel connected the outside, the condenser has the cooling medium channel connected the outside, or the mixed evaporator also has the heat source medium channel connected the outside, the expander connects the compressor and transmits power. Or the expander connects the compressor, the pump and the second pump and transmits power. 
     8. A combined cycle power device comprising an expander, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser and a mixed evaporator. A condenser has a liquid refrigerant pipe which passes through a pump and connects a mixed evaporator, an expander has a low-pressure vapor channel which passes through a high-temperature evaporator and connects the mixed evaporator, the mixed evaporator has a low-pressure vapor channel connected a compressor, the mixed evaporator has a low-pressure vapor channel which passes through the second expander and connects the condenser, the compressor has a vapor channel connected a high-temperature heat exchanger, the high-temperature heat exchanger has a vapor channel connected the expander, the condenser has a liquid refrigerant pipe which passes through the second pump and connects the high-temperature evaporator, the high-temperature evaporator has a vapor channel connected the expander through a intermediate vapor inlet channel The high-temperature heat exchanger has the heat source medium channel connected the outside, or the high-temperature evaporator also has the heat source medium channel connected the outside, the condenser has the cooling medium channel connected the outside, or the mixed evaporator also has the heat source medium channel connected the outside, the expander connects the compressor and transmits power. Or the expander connects the compressor, the pump and the second pump and transmits power. 
     9. A combined cycle power device comprising an expander, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser, a mixed evaporator and the third expander. A condenser has a liquid refrigerant pipe which passes through a pump and connects a mixed evaporator, an expander and the third expander have a low-pressure vapor channel connected the mixed evaporator respectively, the mixed evaporator has a low-pressure vapor channel connected a compressor, the mixed evaporator has a low-pressure vapor channel which passes through the second expander and connects the condenser, the compressor has a vapor channel connected a high-temperature heat exchanger, the high-temperature heat exchanger has a vapor channel connected the expander, a high-temperature evaporator has a vapor channel connected the third expander after that the condenser has a liquid refrigerant pipe which passes through the second pump and connects the high-temperature evaporator. The high-temperature heat exchanger and the high-temperature evaporator have the heat source medium channel connected the outside respectively, the condenser has the cooling medium channel connected the outside, or the mixed evaporator also has the heat source medium channel connected the outside, the expander connects the compressor and transmits power. Or the expander connects the compressor, the pump and the second pump and transmits power. 
     10. A combined cycle power device comprising an expander, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser, a mixed evaporator, the second compressor and the second high-temperature heat exchanger. A condenser has a liquid refrigerant pipe which passes through a pump and connects a mixed evaporator, an expander has a low-pressure vapor channel connected the mixed evaporator, the mixed evaporator has a low-pressure vapor channel connected a compressor, the mixed evaporator has a low-pressure vapor channel which passes through the second expander and connects the condenser, the compressor has a vapor channel connected a high-temperature heat exchanger, a high-temperature evaporator has a vapor channel connected the high-temperature heat exchanger after that the condenser has a liquid refrigerant pipe which passes through the second pump and connects the high-temperature evaporator, the high-temperature heat exchanger has a vapor channel connected the second compressor, the second compressor has a vapor channel which passes through the second high-temperature heat exchanger and connects the expander. The high-temperature heat exchanger, the high-temperature evaporator 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, or the mixed evaporator also has the heat source medium channel connected the outside, the expander connects the compressor and the second compressor and transmits power. Or the expander connects the compressor, the pump, the second pump and the second compressor and transmits power. 
     11. A combined cycle power device comprising an expander, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser, a mixed evaporator, the second compressor and the second high-temperature heat exchanger. A condenser has a liquid refrigerant pipe which passes through a pump and connects a mixed evaporator, an expander has a low-pressure vapor channel which passes through a high-temperature evaporator and connects the mixed evaporator, the mixed evaporator has a low-pressure vapor channel connected a compressor, the mixed evaporator has a low-pressure vapor channel which passes through the second expander and connects the condenser, the compressor has a vapor channel connected a high-temperature heat exchanger, the high-temperature evaporator has a vapor channel connected the high-temperature heat exchanger after that the condenser has a liquid refrigerant pipe which passes through the second pump and connects the high-temperature evaporator, the high-temperature heat exchanger has a vapor channel connected the second compressor, the second compressor has a vapor channel which passes through the second high-temperature heat exchanger and connects the expander. The high-temperature heat exchanger and the second high-temperature heat exchanger have the heat source medium channel connected the outside respectively, or the high-temperature evaporator also has the heat source medium channel connected the outside, the condenser has the cooling medium channel connected the outside, or the mixed evaporator also has the heat source medium channel connected the outside, the expander connects the compressor and the second compressor and transmits power. Or the expander connects the compressor, the pump, the second pump and the second compressor and transmits power. 
     12. A combined cycle power device comprising an expander, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser, a mixed evaporator, the third expander and the second high-temperature heat exchanger. A condenser has a liquid refrigerant pipe which passes through a pump and connects a mixed evaporator, an expander has a low-pressure vapor channel connected the mixed evaporator, the mixed evaporator has a low-pressure vapor channel connected a compressor, the mixed evaporator has a low-pressure vapor channel which passes through the second expander and connects the condenser, the compressor has a vapor channel connected a high-temperature heat exchanger, a high-temperature evaporator has a vapor channel connected the high-temperature heat exchanger after that the condenser has a liquid refrigerant pipe which passes through the second pump and connects the high-temperature evaporator, the high-temperature heat exchanger has a vapor channel connected the third expander, the third expander has a vapor channel which passes through the second high-temperature heat exchanger and connects the expander. The high-temperature heat exchanger, the high-temperature evaporator 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, or the mixed evaporator also has the heat source medium channel connected the outside, the expander connects the compressor and transmits power. Or the expander connects the compressor, the pump and the second pump and transmits power. 
     13. A combined cycle power device comprising an expander, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser, a mixed evaporator, the third expander and the second high-temperature heat exchanger. A condenser has a liquid refrigerant pipe which passes through a pump and connects a mixed evaporator, an expander has a low-pressure vapor channel which passes through a high-temperature evaporator and connects the mixed evaporator, the mixed evaporator has a low-pressure vapor channel connected a compressor, the mixed evaporator has a low-pressure vapor channel which passes through the second expander and connects the condenser, the compressor has a vapor channel connected a high-temperature heat exchanger, the high-temperature evaporator has a vapor channel connected the high-temperature heat exchanger after that the condenser has a liquid refrigerant pipe which passes through the second pump and connects the high-temperature evaporator, the high-temperature heat exchanger has a vapor channel connected the third expander, the third expander has a vapor channel which passes through the second high-temperature heat exchanger and connects the expander. The high-temperature heat exchanger and the second high-temperature heat exchanger have the heat source medium channel connected the outside respectively, or the high-temperature evaporator also has the heat source medium channel connected the outside respectively, the condenser has the cooling medium channel connected the outside, or the mixed evaporator also has the heat source medium channel connected the outside, the expander connects the compressor and transmits power. Or the expander connects the compressor, the pump and the second pump and transmits power. 
     14. A combined cycle power device comprising an expander, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser, a mixed evaporator and a high-temperature regenerator. A condenser has a liquid refrigerant pipe which passes through a pump and connects a mixed evaporator, an expander has a low-pressure vapor channel which passes through a high-temperature regenerator and connects the mixed evaporator, the mixed evaporator has a low-pressure vapor channel connected a compressor, the mixed evaporator has a low-pressure vapor channel which passes through the second expander and connects the condenser, the compressor has a vapor channel which passes through the high-temperature regenerator and connects a high-temperature heat exchanger, the condenser has a liquid refrigerant pipe which passes through the second pump and connects a high-temperature evaporator, the high-temperature evaporator 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 the expander. The high-temperature heat exchanger and the high-temperature evaporator have the heat source medium channel connected the outside respectively, the condenser has the cooling medium channel connected the outside, or the mixed evaporator also has the heat source medium channel connected the outside, the expander connects the compressor and transmits power. Or the expander connects the compressor, the pump and the second pump and transmits power. 
     15. A combined cycle power device comprising an expander, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser, a mixed evaporator and a high-temperature regenerator. A condenser has a liquid refrigerant pipe which passes through a pump and connects a mixed evaporator, an expander has a low-pressure vapor channel which passes through a high-temperature regenerator and a high-temperature evaporator and connects the mixed evaporator, the mixed evaporator has a low-pressure vapor channel connected a compressor, the mixed evaporator has a low-pressure vapor channel which passes through the second expander and connects the condenser, the compressor has a vapor channel which passes through the high-temperature regenerator and connects a high-temperature heat exchanger, the condenser has a liquid refrigerant pipe which passes through the second pump and connects the high-temperature evaporator, the high-temperature evaporator 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 the expander. The high-temperature heat exchanger has the heat source medium channel connected the outside, or the high-temperature evaporator also has the heat source medium channel connected the outside, the condenser has the cooling medium channel connected the outside, or the mixed evaporator also has the heat source medium channel connected the outside, the expander connects the compressor and transmits power. Or the expander connects the compressor, the pump and the second pump and transmits power. 
     16. A combined cycle power device comprising an expander, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser, a mixed evaporator, a heating unit and a high-temperature regenerator. A condenser has a liquid refrigerant pipe which passes through a pump and connects a mixed evaporator, an expander has a low-pressure vapor channel which passes through a high-temperature regenerator and a heating unit and connects the mixed evaporator, the mixed evaporator has a low-pressure vapor channel connected a compressor, the mixed evaporator has a low-pressure vapor channel which passes through the second expander and connects the condenser, the compressor has a vapor channel which passes through the high-temperature regenerator and connects a high-temperature heat exchanger, the condenser has a liquid refrigerant pipe which passes through the second pump and connects a high-temperature evaporator, the high-temperature evaporator 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 the expander. The high-temperature heat exchanger and the high-temperature evaporator have the heat source medium channel connected the outside respectively, the condenser has the cooling medium channel connected the outside, or the mixed evaporator also has the heat source medium channel connected the outside, the heating unit has the heated medium channel connected the outside, the expander connects the compressor and transmits power. Or the expander connects the compressor, the pump and the second pump and transmits power. 
     17. A combined cycle power device comprising an expander, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser, a mixed evaporator and a preheater. A condenser has a liquid refrigerant pipe which passes through a pump and connects a mixed evaporator, an expander has a low-pressure vapor channel which passes through a preheater and connects the mixed evaporator, the mixed evaporator has a low-pressure vapor channel connected a compressor, the mixed evaporator has a low-pressure vapor channel which passes through the second expander and connects the condenser, the compressor has a vapor channel connected a high-temperature heat exchanger, the condenser has a liquid refrigerant pipe which passes through the second pump and the preheater and connects a high-temperature evaporator, the high-temperature evaporator has a vapor channel connected the high-temperature heat exchanger, the high-temperature heat exchanger has a vapor channel connected the expander. The high-temperature heat exchanger and the high-temperature evaporator have the heat source medium channel connected the outside respectively, the condenser has the cooling medium channel connected the outside, or the mixed evaporator also has the heat source medium channel connected the outside, the expander connects the compressor and transmits power. Or the expander connects the compressor, the pump and the second pump and transmits power. 
     18. The device according to any one of claim  1 - 16 , wherein adding the low-temperature regenerator and the third pump, adjusting that the condenser has a liquid refrigerant pipe which passes through the second pump and connects the high-temperature evaporator to that the condenser has a liquid refrigerant pipe which passes through the second 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 third pump and connects the high-temperature 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. 
     
    
    
     In the figures,  1 —expander,  2 —compressor,  3 —the second expander,  4 —pump,  5 —the second pump,  6 —high-temperature heat exchanger,  7 —high-temperature evaporator,  8 —condenser,  9 —mixed evaporator (waste heat boiler),  10 —heating unit,  11 —the third expander,  12 —the second condenser,  13 —the second high-temperature heat exchanger,  14 —high-temperature regenerator,  15 —preheater,  16 —low-temperature regenerator,  17 —the third pump. 
     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, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser and a mixed evaporator. A condenser  8  has a liquid refrigerant pipe which passes through a pump  4  and connects a mixed evaporator  9 , an expander  1  has a low-pressure vapor channel connected the mixed evaporator  9 , the mixed evaporator  9  has a low-pressure vapor channel connected a compressor  2 , the mixed evaporator  9  has a low-pressure vapor channel which passes through the second expander  3  and connects the condenser  8 , the compressor  2  has a vapor channel connected a high-temperature heat exchanger  6 , a high-temperature evaporator  7  has a vapor channel connected the high-temperature heat exchanger  6  after that the condenser  8  has a liquid refrigerant pipe which passes through the second pump  5  and connects the high-temperature evaporator  7 , the high-temperature heat exchanger  6  has a vapor channel connected the expander  1 . The high-temperature heat exchanger  6  and the high-temperature evaporator  7  have the heat source medium channel connected the outside respectively, the condenser  8  has the cooling medium channel connected the outside, the expander  1  connects the compressor  2  and transmits power. 
     (2) Working processes. The first current condensate of the condenser  8  flows through the pump  4  and enters the mixed evaporator  9  in which it mixes with the low-pressure vapor came from the expander  1 , absorbs heat and vaporizes. And then the vapor is divided into two currents. The first current enters the compressor  2  for pressure rise and temperature rise, and then enters the high-temperature heat exchanger  6  for heat absorption. The second current flows through the second expander  3  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The second current condensate of the condenser  8  flows through the second pump  5  and enters into the high-temperature evaporator  7  in which it absorbs heat, vaporizes and superheats, 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 expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  enters the mixed evaporator  9  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the high-temperature evaporator  7 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The expander  1  supplies power to the compressor  2 . The expander  1  and the second expander  3  supply power to the outside. The combined cycle power device is formed. 
     Combined with  FIG. 1 , what needs to be declared is: 
     (1) The expression “the expander  1  connects the compressor  2  and transmits 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) The work output by the expander is greater than the power required by the compressor generally. Of course, when the output power of the second expander  3  is enough to meet the needs of the compressor  2 , the second expander  3  can also provide power to the compressor  2 . 
     The combined cycle power device in  FIG. 2  works as follows: 
     (1) Device structure. The combined cycle power device comprises an expander, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser and a mixed evaporator. A condenser  8  has a liquid refrigerant pipe which passes through a pump  4  and connects a mixed evaporator  9 , an expander  1  has a low-pressure vapor channel which passes through a high-temperature evaporator  7  and connects the mixed evaporator  9 , the mixed evaporator  9  has a low-pressure vapor channel connected a compressor  2 , the mixed evaporator  9  has a low-pressure vapor channel which passes through the second expander  3  and connects the condenser  8 , the compressor  2  has a vapor channel connected a high-temperature heat exchanger  6 , the high-temperature evaporator  7  has a vapor channel connected the high-temperature heat exchanger  6  after that the condenser  8  has a liquid refrigerant pipe which passes through the second pump  5  and connects the high-temperature evaporator  7 , the high-temperature heat exchanger  6  has a vapor channel connected the expander  1 . The high-temperature heat exchanger  6  and the high-temperature evaporator  7  have the heat source medium channel connected the outside, the condenser  8  has the cooling medium channel connected the outside, the expander  1  connects the compressor  2  and transmits power. 
     (2) Working processes. The first current condensate of the condenser  8  flows through the pump  4  and enters the mixed evaporator  9  in which it mixes with the low-pressure vapor came from the high-temperature evaporator  7 , absorbs heat and vaporizes. And then the vapor is divided into two currents. The first current enters the compressor  2  for pressure rise and temperature rise, and then enters the high-temperature heat exchanger  6  for heat absorption. The second current flows through the second expander  3  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The second current condensate of the condenser  8  flows through the second pump  5  and enters into the high-temperature evaporator  7  in which it absorbs heat, vaporizes and superheats, 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 expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  flows through the high-temperature evaporator  7  and enters the mixed evaporator  9  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the high-temperature evaporator  7 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The expander  1  supplies power to the compressor  2 . The expander  1  and the second expander  3  supply power to the outside. The combined cycle power device is formed. 
     The combined cycle power device in  FIG. 3  works as follows: 
     (1) Device structure. The combined cycle power device comprises an expander, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser, a mixed evaporator and a heating unit. A condenser  8  has a liquid refrigerant pipe which passes through a pump  4  and connects a mixed evaporator  9 , an expander  1  has a low-pressure vapor channel which passes through a heating unit  10  and connects the mixed evaporator  9 , the mixed evaporator  9  has a low-pressure vapor channel connected a compressor  2 , the mixed evaporator  9  has a low-pressure vapor channel which passes through the second expander  3  and connects the condenser  8 , the compressor  2  has a vapor channel connected a high-temperature heat exchanger  6 , the high-temperature evaporator  7  has a vapor channel connected the high-temperature heat exchanger  6  after that the condenser  8  has a liquid refrigerant pipe which passes through the second pump  5  and connects the high-temperature evaporator  7 , the high-temperature heat exchanger  6  has a vapor channel connected the expander  1 . The high-temperature heat exchanger  6  and the high-temperature evaporator  7  have the heat source medium channel connected the outside respectively, the condenser  8  has the cooling medium channel connected the outside, the heating unit  10  has the heated medium channel connected the outside, the expander  1  connects the compressor  2  and transmits power. 
     (2) Working processes. The first current condensate of the condenser  8  flows through the pump  4  and enters the mixed evaporator  9  in which it mixes with the low-pressure vapor came from the heating unit  10 , absorbs heat and vaporizes. And then the vapor is divided into two currents. The first current enters the compressor  2  for pressure rise and temperature rise, and then enters the high-temperature heat exchanger  6  for heat absorption. The second current flows through the second expander  3  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The second current condensate of the condenser  8  flows through the second pump  5  and enters into the high-temperature evaporator  7  in which it absorbs heat, vaporizes and superheats, 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 expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  flows through the heating unit  10  and enters the mixed evaporator  9  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the high-temperature evaporator  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  supplies power to the compressor  2 . The expander  1  and the second expander  3  supply power to the outside. 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, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser, a mixed evaporator and a heating unit. A condenser  8  has a liquid refrigerant pipe which passes through a pump  4  and connects a mixed evaporator  9 , an expander  1  has a low-pressure vapor channel which passes through a high-temperature evaporator  7  and a heating unit  10  and connects the mixed evaporator  9 , the mixed evaporator  9  has a low-pressure vapor channel connected a compressor  2 , the mixed evaporator  9  has a low-pressure vapor channel which passes through the second expander  3  and connects the condenser  8 , the compressor  2  has a vapor channel connected a high-temperature heat exchanger  6 , the high-temperature evaporator  7  has a vapor channel connected the high-temperature heat exchanger  6  after that the condenser  8  has a liquid refrigerant pipe which passes through the second pump  5  and connects the high-temperature evaporator  7 , the high-temperature heat exchanger  6  has a vapor channel connected the expander  1 . The high-temperature heat exchanger  6  and the high-temperature evaporator  7  have the heat source medium channel connected the outside respectively, the condenser  8  has the cooling medium channel connected the outside, the heating unit  10  has the heated medium channel connected the outside, the expander  1  connects the compressor  2  and transmits power. 
     (2) Working processes. The first current condensate of the condenser  8  flows through the pump  4  and enters the mixed evaporator  9  in which it mixes with the low-pressure vapor came from the heating unit  10 , absorbs heat and vaporizes. And then the vapor is divided into two currents. The first current enters the compressor  2  for pressure rise and temperature rise, and then enters the high-temperature heat exchanger  6  for heat absorption. The second current flows through the second expander  3  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The second current condensate of the condenser  8  flows through the second pump  5  and enters into the high-temperature evaporator  7  in which it absorbs heat, vaporizes and superheats, 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 expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  flows through the high-temperature evaporator  7  and the heating unit  10  and enters the mixed evaporator  9  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the high-temperature evaporator  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  supplies power to the compressor  2 . The expander  1  and the second expander  3  supply power to 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, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser and a mixed evaporator. A condenser  8  has a liquid refrigerant pipe which passes through a pump  4  and connects a mixed evaporator  9 , an expander  1  has a low-pressure vapor channel connected the mixed evaporator  9 , the mixed evaporator  9  has a low-pressure vapor channel connected a compressor  2 , the mixed evaporator  9  has a low-pressure vapor channel which passes through the second expander  3  and connects the condenser  8 , the compressor  2  has a vapor channel connected a high-temperature heat exchanger  6 , the high-temperature heat exchanger  6  has a vapor channel connected the expander  1  through a intermediate vapor inlet channel, the condenser  8  has a liquid refrigerant pipe which passes through the second pump  5  and connects a high-temperature evaporator  7 , the high-temperature evaporator  7  has a vapor channel connected the expander  1 . The high-temperature heat exchanger  6  and the high-temperature evaporator  7  have the heat source medium channel connected the outside respectively, the condenser  8  has the cooling medium channel connected the outside, the expander  1  connects the compressor  2  and transmits power. 
     (2) Working processes. The first current condensate of the condenser  8  flows through the pump  4  and enters the mixed evaporator  9  in which it mixes with the low-pressure vapor came from the expander  1 , absorbs heat and vaporizes. And then the vapor is divided into two currents. The first current enters the compressor  2  for pressure rise and temperature rise, and then enters the high-temperature heat exchanger  6  for heat absorption. The second current flows through the second expander  3  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The second current condensate of the condenser  8  flows through the second pump  5  and enters into the high-temperature evaporator  7  in which it absorbs heat, vaporizes and superheats, and then enters the expander  1  to depressurize and output work. The vapor discharged from the high-temperature heat exchanger  6  enters the expander  1  through a intermediate vapor inlet channel to depressurize and output work. The low-pressure vapor discharged from the expander  1  enters the mixed evaporator  9  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the high-temperature evaporator  7 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The expander  1  supplies power to the compressor  2 . The expander  1  and the second expander  3  supply power to 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, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser and a mixed evaporator. A condenser  8  has a liquid refrigerant pipe which passes through a pump  4  and connects a mixed evaporator  9 , an expander  1  has a low-pressure vapor channel connected the mixed evaporator  9 , the mixed evaporator  9  has a low-pressure vapor channel connected a compressor  2 , the mixed evaporator  9  has a low-pressure vapor channel which passes through the second expander  3  and connects the condenser  8 , the compressor  2  has a vapor channel connected a high-temperature heat exchanger  6 , the high-temperature heat exchanger  6  has a vapor channel connected the expander  1 , the condenser  8  has a liquid refrigerant pipe which passes through the second pump  5  and connects a high-temperature evaporator  7 , the high-temperature evaporator  7  has a vapor channel connected the expander  1  through the intermediate vapor inlet channel The high-temperature heat exchanger  6  and the high-temperature evaporator  7  have the heat source medium channel connected the outside respectively, the condenser  8  has the cooling medium channel connected the outside, the expander  1  connects the compressor  2  and transmits power. 
     (2) Working processes. The first current condensate of the condenser  8  flows through the pump  4  and enters the mixed evaporator  9  in which it mixes with the low-pressure vapor came from the expander  1 , absorbs heat and vaporizes. And then the vapor is divided into two currents. The first current enters the compressor  2  for pressure rise and temperature rise, and then enters the high-temperature heat exchanger  6  for heat absorption. The second current flows through the second expander  3  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The second current condensate of the condenser  8  flows through the second pump  5  and enters into the high-temperature evaporator  7  in which it absorbs heat, vaporizes and superheats, and then enters the expander  1  through the intermediate vapor inlet channel to depressurize and output work. The vapor discharged from the high-temperature heat exchanger  6  enters the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  enters the mixed evaporator  9  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the high-temperature evaporator  7 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The expander  1  supplies power to the compressor  2 . The expander  1  and the second expander  3  supply power to 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, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser and a mixed evaporator. A condenser  8  has a liquid refrigerant pipe which passes through a pump  4  and connects a mixed evaporator  9 , an expander  1  has a low-pressure vapor channel which passes through a high-temperature evaporator  7  and connects the mixed evaporator  9 , the mixed evaporator  9  has a low-pressure vapor channel connected a compressor  2 , the mixed evaporator  9  has a low-pressure vapor channel which passes through the second expander  3  and connects the condenser  8 , the compressor  2  has a vapor channel connected a high-temperature heat exchanger  6 , the high-temperature heat exchanger  6  has a vapor channel connected the expander  1  through a intermediate vapor inlet channel, the condenser  8  has a liquid refrigerant pipe which passes through the second pump  5  and connects the high-temperature evaporator  7 , the high-temperature evaporator  7  has a vapor channel connected the expander  1 . The high-temperature heat exchanger  6  and the high-temperature evaporator  7  have the heat source medium channel connected the outside respectively, the condenser  8  has the cooling medium channel connected the outside, the expander  1  connects the compressor  2  and transmits power. 
     (2) Working processes. The first current condensate of the condenser  8  flows through the pump  4  and enters the mixed evaporator  9  in which it mixes with the low-pressure vapor came from the high-temperature evaporator  7 , absorbs heat and vaporizes. And then the vapor is divided into two currents. The first current enters the compressor  2  for pressure rise and temperature rise, and then enters the high-temperature heat exchanger  6  for heat absorption. The second current flows through the second expander  3  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The second current condensate of the condenser  8  flows through the second pump  5  and enters into the high-temperature evaporator  7  in which it absorbs heat, vaporizes and superheats, and then enters the expander  1  to depressurize and output work. The vapor discharged from the high-temperature heat exchanger  6  enters the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  flows through the high-temperature evaporator  7  and enters the mixed evaporator  9  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the high-temperature evaporator  7 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The expander  1  supplies power to the compressor  2 . The expander  1  and the second expander  3  supply power to 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, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser, a mixed evaporator and the third expander. A condenser  8  has a liquid refrigerant pipe which passes through a pump  4  and connects a mixed evaporator  9 , an expander  1  and the third expander  11  have a low-pressure vapor channel connected the mixed evaporator  9  respectively, the mixed evaporator  9  has a low-pressure vapor channel connected a compressor  2 , the mixed evaporator  9  has a low-pressure vapor channel which passes through the second expander  3  and connects the condenser  8 , the compressor  2  has a vapor channel connected a high-temperature heat exchanger  6 , the high-temperature heat exchanger  6  has a vapor channel connected the expander  1 , a high-temperature evaporator  7  has a vapor channel connected the third expander  11  after that the condenser  8  has a liquid refrigerant pipe which passes through the second pump  5  and connects the high-temperature evaporator  7 . The high-temperature heat exchanger  6  and the high-temperature evaporator  7  have the heat source medium channel connected the outside respectively, the condenser  8  has the cooling medium channel connected the outside, the expander  1  connects the compressor  2  and transmits power. 
     (2) Working processes. The first current condensate of the condenser  8  flows through the pump  4  and enters the mixed evaporator  9  in which it mixes with the low-pressure vapor came from the expander  1  and the third expander  11 , absorbs heat and vaporizes. And then the vapor is divided into two currents. The first current enters the compressor  2  for pressure rise and temperature rise, and then enters the high-temperature heat exchanger  6  for heat absorption. The second current flows through the second expander  3  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The second current condensate of the condenser  8  flows through the second pump  5  and enters into the high-temperature evaporator  7  in which it absorbs heat, vaporizes and superheats. And then, the superheats vapor flows through the third expander  11  to depressurize and output work, and then enters the mixed evaporator  9  to release heat and cool down. The vapor discharged from the high-temperature heat exchanger  6  enters the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  enters the mixed evaporator  9  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the high-temperature evaporator  7 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The expander  1  supplies power to the compressor  2 . The expander  1 , the second expander  3  and the third expander  11  supply power to 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, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser, a mixed evaporator, the second compressor and the second high-temperature heat exchanger. A condenser  8  has a liquid refrigerant pipe which passes through a pump  4  and connects a mixed evaporator  9 , an expander  1  has a low-pressure vapor channel connected the mixed evaporator  9 , the mixed evaporator  9  has a low-pressure vapor channel connected a compressor  2 , the mixed evaporator  9  has a low-pressure vapor channel which passes through the second expander  3  and connects the condenser  8 , the compressor  2  has a vapor channel connected a high-temperature heat exchanger  6 , a high-temperature evaporator  7  has a vapor channel connected the high-temperature heat exchanger  6  after that the condenser  8  has a liquid refrigerant pipe which passes through the second pump  5  and connects the high-temperature evaporator  7 , the high-temperature heat exchanger  6  has a vapor channel connected the second compressor  12 , the second compressor  12  has a vapor channel which passes through the second high-temperature heat exchanger  13  and connects the expander  1 . The high-temperature heat exchanger  6 , the high-temperature evaporator  7  and the second high-temperature heat exchanger  13  have the heat source medium channel connected the outside respectively, the condenser  8  has the cooling medium channel connected the outside, the expander  1  connects the compressor  2  and the second compressor  12  and transmits power. 
     (2) Working processes. The first current condensate of the condenser  8  flows through the pump  4  and enters the mixed evaporator  9  in which it mixes with the low-pressure vapor came from the expander  1 , absorbs heat and vaporizes. And then the vapor is divided into two currents. The first current enters the compressor  2  for pressure rise and temperature rise, and then enters the high-temperature heat exchanger  6  for heat absorption. The second current flows through the second expander  3  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The second current condensate of the condenser  8  flows through the second pump  5  and enters into the high-temperature evaporator  7  in which it absorbs heat, vaporizes and superheats, 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  12  for pressure rise and temperature rise, flows through the second high-temperature heat exchanger  13  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 mixed evaporator  9  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6 , the high-temperature evaporator  7  and the second high-temperature heat exchanger  13 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The expander  1  supplies power to the compressor  2  and the second compressor  12 . The expander  1  and the second expander  3  supply power to 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, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser, a mixed evaporator, the third expander and the second high-temperature heat exchanger. A condenser  8  has a liquid refrigerant pipe which passes through a pump  4  and connects a mixed evaporator  9 , an expander  1  has a low-pressure vapor channel connected the mixed evaporator  9 , the mixed evaporator  9  has a low-pressure vapor channel connected a compressor  2 , the mixed evaporator  9  has a low-pressure vapor channel which passes through the second expander  3  and connects the condenser  8 , the compressor  2  has a vapor channel connected a high-temperature heat exchanger  6 , a high-temperature evaporator  7  has a vapor channel connected the high-temperature heat exchanger  6  after that the condenser  8  has a liquid refrigerant pipe which passes through the second pump  5  and connects the high-temperature evaporator  7 , the high-temperature heat exchanger  6  has a vapor channel connected the third expander  11 , the third expander  11  has a vapor channel which passes through the second high-temperature heat exchanger  13  and connects the expander  1 . The high-temperature heat exchanger  6 , the high-temperature evaporator  7  and the second high-temperature heat exchanger  13  have the heat source medium channel connected the outside respectively, the condenser  8  has the cooling medium channel connected the outside, the expander  1  connects the compressor  2  and transmits power. 
     (2) Working processes. The first current condensate of the condenser  8  flows through the pump  4  and enters the mixed evaporator  9  in which it mixes with the low-pressure vapor came from the high-temperature evaporator  7 , absorbs heat and vaporizes. And then the vapor is divided into two currents. The first current enters the compressor  2  for pressure rise and temperature rise, and then enters the high-temperature heat exchanger  6  for heat absorption. The second current flows through the second expander  3  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The second current condensate of the condenser  8  flows through the second pump  5  and enters into the high-temperature evaporator  7  in which it absorbs heat, vaporizes and superheats, 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 third expander  11  to depressurize and output work, flows through the second high-temperature heat exchanger  13  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 evaporator land enters the mixed evaporator  9  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6 , the high-temperature evaporator  7  and the second high-temperature heat exchanger  13 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The expander  1  supplies power to the compressor  2  and the second compressor  12 . The expander  1 , the second expander  3  and the third expander  11  supply power to 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, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser, a mixed evaporator and a high-temperature regenerator. A condenser  8  has a liquid refrigerant pipe which passes through a pump  4  and connects a mixed evaporator  9 , an expander  1  has a low-pressure vapor channel which passes through a high-temperature regenerator  14  and connects the mixed evaporator  9 , the mixed evaporator  9  has a low-pressure vapor channel connected a compressor  2 , the mixed evaporator  9  has a low-pressure vapor channel which passes through the second expander  3  and connects the condenser  8 , the compressor  2  has a vapor channel which passes through the high-temperature regenerator  14  and connects a high-temperature heat exchanger  6 , the condenser  8  has a liquid refrigerant pipe which passes through the second pump  5  and connects a high-temperature evaporator  7 , the high-temperature evaporator  7  has a vapor channel which passes through the high-temperature regenerator  14  and connects the high-temperature heat exchanger  6 , the high-temperature heat exchanger  6  has a vapor channel connected the expander  1 . The high-temperature heat exchanger  6  and the high-temperature evaporator  7  have the heat source medium channel connected the outside respectively, the condenser  8  has the cooling medium channel connected the outside, the expander  1  connects the compressor  2  and transmits power. 
     (2) Working processes. The first current condensate of the condenser  8  flows through the pump  4  and enters the mixed evaporator  9  in which it mixes with the low-pressure vapor came from the high-temperature regenerator  14 , absorbs heat and vaporizes. And then the vapor is divided into two currents. The first current enters the compressor  2  for pressure rise and temperature rise. The second current flows through the second expander  3  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The second current condensate of the condenser  8  flows through the second pump  5  and enters into the high-temperature evaporator  7  in which it absorbs heat, vaporizes and superheats. And then, the superheats vapor flows through the high-temperature regenerator  14  and enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the compressor  2  flows through the high-temperature regenerator  14  and enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the high-temperature heat exchanger  6  enters the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  flows through the high-temperature regenerator  14  and enters the mixed evaporator  9  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the high-temperature evaporator  7 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The expander  1  supplies power to the compressor  2 . The expander  1  and the second expander  3  supply power to 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, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser, a mixed evaporator and a high-temperature regenerator. A condenser  8  has a liquid refrigerant pipe which passes through a pump  4  and connects a mixed evaporator  9 , an expander  1  has a low-pressure vapor channel which passes through a high-temperature regenerator  14  and a high-temperature evaporator  7  and connects the mixed evaporator  9 , the mixed evaporator  9  has a low-pressure vapor channel connected a compressor  2 , the mixed evaporator  9  has a low-pressure vapor channel which passes through the second expander  3  and connects the condenser  8 , the compressor  2  has a vapor channel which passes through the high-temperature regenerator  14  and connects a high-temperature heat exchanger  6 , the condenser  8  has a liquid refrigerant pipe which passes through the second pump  5  and connects the high-temperature evaporator  7 , the high-temperature evaporator  7  has a vapor channel which passes through the high-temperature regenerator  14  and connects the high-temperature heat exchanger  6 , the high-temperature heat exchanger  6  has a vapor channel connected the expander  1 . The high-temperature heat exchanger  6  has the heat source medium channel connected the outside, or the high-temperature evaporator  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  connects the compressor  2  and transmits power. 
     (2) Working processes. The first current condensate of the condenser  8  flows through the pump  4  and enters the mixed evaporator  9  in which it mixes with the low-pressure vapor came from the high-temperature evaporator  7 , absorbs heat and vaporizes. And then the vapor is divided into two currents. The first current enters the compressor  2  for pressure rise and temperature rise. The second current flows through the second expander  3  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The second current condensate of the condenser  8  flows through the second pump  5  and enters into the high-temperature evaporator  7  in which it absorbs heat, vaporizes and superheats. And then, the superheats vapor flows through the high-temperature regenerator  14  and enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the compressor  2  flows through the high-temperature regenerator  14  and enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the high-temperature heat exchanger  6  enters the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  flows through the high-temperature regenerator  14  and the high-temperature evaporator  7  and enters the mixed evaporator  9  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the high-temperature evaporator  7 . The cooling medium takes away the low-temperature heat load through the condenser  8 . The expander  1  supplies power to the compressor  2 . The expander  1  and the second expander  3  supply power to 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, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser, a mixed evaporator, a heating unit and a high-temperature regenerator. A condenser  8  has a liquid refrigerant pipe which passes through a pump  4  and connects a mixed evaporator  9 , an expander  1  has a low-pressure vapor channel which passes through a high-temperature regenerator  14  and a heating unit  10  and connects the mixed evaporator  9 , the mixed evaporator  9  has a low-pressure vapor channel connected a compressor  2 , the mixed evaporator  9  has a low-pressure vapor channel which passes through the second expander  3  and connects the condenser  8 , the compressor  2  has a vapor channel which passes through the high-temperature regenerator  14  and connects a high-temperature heat exchanger  6 , the condenser  8  has a liquid refrigerant pipe which passes through the second pump  5  and connects a high-temperature evaporator  7 , the high-temperature evaporator  7  has a vapor channel which passes through the high-temperature regenerator  14  and connects the high-temperature heat exchanger  6 , the high-temperature heat exchanger  6  has a vapor channel connected the expander  1 . The high-temperature heat exchanger  6  and the high-temperature evaporator  7  have the heat source medium channel connected the outside respectively, the condenser  8  has the cooling medium channel connected the outside, the heating unit  10  has the heated medium channel connected the outside, the expander  1  connects the compressor  2  and transmits power. 
     (2) Working processes. The first current condensate of the condenser  8  flows through the pump  4  and enters the mixed evaporator  9  in which it mixes with the low-pressure vapor came from the heating unit  10 , absorbs heat and vaporizes. And then the vapor is divided into two currents. The first current enters the compressor  2  for pressure rise and temperature rise. The second current flows through the second expander  3  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The second current condensate of the condenser  8  flows through the second pump  5  and enters into the high-temperature evaporator  7  in which it absorbs heat, vaporizes and superheats. And then, the superheats vapor flows through the high-temperature regenerator  14  and enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the compressor  2  flows through the high-temperature regenerator  14  and enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the high-temperature heat exchanger  6  enters the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  flows through the high-temperature regenerator  14  and the heating unit  10  and enters the mixed evaporator  9  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the high-temperature evaporator  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  supplies power to the compressor  2 . The expander  1  and the second expander  3  supply power to 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, a compressor, the second expander, a pump, the second pump, a high-temperature heat exchanger, a high-temperature evaporator, a condenser, a mixed evaporator and a preheater. A condenser  8  has a liquid refrigerant pipe which passes through a pump  4  and connects a mixed evaporator  9 , an expander  1  has a low-pressure vapor channel which passes through a preheater  15  and connects the mixed evaporator  9 , the mixed evaporator  9  has a low-pressure vapor channel connected a compressor  2 , the mixed evaporator  9  has a low-pressure vapor channel which passes through the second expander  3  and connects the condenser  8 , the compressor  2  has a vapor channel connected a high-temperature heat exchanger  6 , the condenser  8  has a liquid refrigerant pipe which passes through the second pump  5  and the preheater  15  and connects a high-temperature evaporator  7 , the high-temperature heat exchanger  6  has a vapor channel connected the expander  1 . The high-temperature heat exchanger  6  and the high-temperature evaporator  7  have the heat source medium channel connected the outside respectively, the condenser  8  has the cooling medium channel connected the outside, the expander  1  connects the compressor  2  and transmits power. 
     (2) Working processes. The first current condensate of the condenser  8  flows through the pump  4  and enters the mixed evaporator  9  in which it mixes with the low-pressure vapor came from the preheater  15 , absorbs heat and vaporizes. And then the vapor is divided into two currents. The first current enters the compressor  2  for pressure rise and temperature rise, and then enters the high-temperature heat exchanger  6  for heat absorption. The second current flows through the second expander  3  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The second current condensate of the condenser  8  flows through the second pump  5 , flows through the preheater  15  for heat absorption, flows through the high-temperature evaporator  7  in which it absorbs heat, vaporizes and superheats, and then enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the high-temperature heat exchanger  6  enters the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  flows through the preheater  15  and enters the mixed evaporator  9  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the high-temperature evaporator  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  supplies power to the compressor  2 . The expander  1  and the second expander  3  supply power to the outside. The combined cycle power device is formed. 
     The combined cycle power device in  FIG. 15  works as follows: 
     (1) Device structure. Based on the combined cycle power device in  FIG. 1 , a low-temperature regenerator and the third pump are added. That the condenser  8  has a liquid refrigerant pipe which passes through the second pump  5  and connects the high-temperature evaporator  7  is adjusted to that the condenser  8  has a liquid refrigerant pipe which passes through the second pump  5  and connects a low-temperature regenerator  16 . The compressor  2  adds the vapor extraction channel connected the low-temperature regenerator  16 . The low-temperature regenerator  16  has a liquid refrigerant pipe which passes through the third pump  17  and connects the high-temperature evaporator  7   
     (2) Working processes. The first current condensate of the condenser  8  flows through the pump  4  and enters the mixed evaporator  9  in which it mixes with the low-pressure vapor came from the expander  1 , absorbs heat and vaporizes. And then the vapor is divided into two currents. The first current enters the compressor  2  for pressure rise and temperature rise. The second current flows through the second expander  3  to depressurize and output work, and then enters the condenser  8  to release heat and cool down. The vapor entering compressor  2  is divided into two currents after boosting to a certain extent. The first current enters the low-temperature regenerator  16  through the intermediate vapor inlet channel The second current continues to increase pressure and temperature, and then enters the high-temperature heat exchanger  6  for heat absorption. The second current condensate of the condenser  8  flows through the second pump  5  and enters the low-temperature regenerator  16  in which it mixes with the low-pressure vapor came from the compressor  2  for heat absorption. After the extraction vapor is mixed with the condensate, it releases heat and condenses. The condensate of the low-temperature regenerator  16  flows through the third pump  17  and enters the high-temperature evaporator  7  in which it absorbs heat, vaporizes and superheats, and then enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from the high-temperature heat exchanger  6  enters the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  enters the mixed evaporator  9  to release heat and cool down. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the high-temperature evaporator  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  supplies power to the compressor  2 . The expander  1  and the second expander  3  supply power to 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.