Patent Publication Number: US-2022220868-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, a condenser and an evaporator. An evaporator has a vapor channel connected the second expander has a vapor channel connected the that a condenser has a liquid refrigerant pipe which passes through a pump and connects the evaporator, the second expander has a vapor channel connected 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 an expander, the evaporator has a low-pressure vapor channel connected the compressor and the third expander respectively has a vapor channel connected the 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 has 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 if necessary, the expander, the second expander and the third expander connect the compressor and transmit power. The expander, the second expander and the third expander connect the compressor and the pump and transmit power if necessary. 
     2. A combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator and a high-temperature regenerator. An evaporator has a vapor channel connected the second expander has a vapor channel connected the that a condenser has a liquid refrigerant pipe which passes through a pump and connects the evaporator, the second expander and a compressor have a vapor channel which passes through a high-temperature regenerator and connects the high-temperature heat exchanger respectively, 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 has a vapor channel connected the 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 has 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 if necessary, the expander, the second expander and the third expander connect the compressor and transmit power. The expander, the second expander and the third expander connect the compressor and the pump and transmit power if necessary. 
     3. A combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator and the fourth expander. An evaporator has a vapor channel connected the second expander has a vapor channel connected the that a condenser has a liquid refrigerant pipe which passes through a pump and connects the evaporator, the second expander and a compressor have a vapor channel connects the high-temperature heat exchanger respectively, the high-temperature heat exchanger has a vapor channel which passes through a intermediate vapor inlet channel and connects the fourth expander, the fourth expander has a intermediate low-pressure vapor channel connected the evaporator, the high-temperature heat exchanger has a vapor channel connected the 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 has 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 if necessary, the expander, the second expander, the third expander and the fourth expander connect the compressor and transmit power. The expander, the second expander, the third expander and the fourth expander connect the compressor and the pump and transmit power if necessary, 
     4. A combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator and the second high-temperature heat exchanger. An evaporator has a vapor channel which passes through the second high-temperature heat exchanger and connects the second expander has a vapor channel connected the that a condenser has a liquid refrigerant pipe which passes through a pump and connects the evaporator, the second expander and a compressor have a vapor channel connects the high-temperature heat exchanger respectively, the compressor has a vapor channel connected the high-temperature heat exchanger, the high-temperature heat exchanger has a vapor channel connected the 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 respectively, the condenser has the cooling medium channel connected the outside, the evaporator has the heat source medium channel connected the outside if necessary, the expander, the second expander and the third expander connect the compressor and transmit power. The expander, the second expander and the third expander connect the compressor and the pump and transmit power if necessary. 
     5. A combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator and a heating unit. An evaporator has a vapor channel connected the second expander has a vapor channel connected the that a condenser has a liquid refrigerant pipe which passes through a pump and connects the evaporator, the second expander has a vapor channel connected the high-temperature heat exchanger, the compressor has a vapor channel connected the high-temperature heat exchanger, the high-temperature heat exchanger has a vapor channel connected the expander, 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 has a vapor channel connected the that the expander has a low-pressure vapor channel and connects the heating unit, 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, 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. The expander, the second expander and the third expander connect the compressor and the pump and transmit power if necessary. 
     6. A combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator and a heating unit. An evaporator has a vapor channel connected the second expander has a vapor channel connected the that a condenser has a liquid refrigerant pipe which passes through a pump and connects the evaporator, the second expander has a vapor channel connected the high-temperature heat exchanger, the 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 heating unit has a vapor channel connected the 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 has 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. The expander, the second expander and the third expander connect the compressor and the pump and transmit power if necessary. 
     7. A combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator, the second high-temperature heat exchanger and the second compressor. An evaporator has a vapor channel connected the second expander has a vapor channel connected the that a condenser has a liquid refrigerant pipe which passes through a pump and connects the evaporator, the second expander has a vapor channel connected the high-temperature heat exchanger, the 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 second high-temperature heat exchanger and connects the expander, the evaporator has a low-pressure vapor channel connected the compressor and the third expander respectively has a vapor channel connected the 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, the evaporator 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. The expander, the second expander and the third expander connect the compressor and the pump and the second compressor and transmit power if necessary. 
     8. A combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator, the fourth expander and the second high-temperature heat exchanger. An evaporator has a vapor channel connected the second expander has a vapor channel connected the that a condenser has a liquid refrigerant pipe which passes through a pump and connects the evaporator, the second expander has a vapor channel connected the high-temperature heat exchanger, the 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 second high-temperature heat exchanger and connects the expander, the evaporator has a low-pressure vapor channel connected the compressor and the third expander respectively has a vapor channel connected the 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 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. The expander, the second expander, the third expander, and the fourth expander connect the compressor and the pump and transmit power if necessary. 
     9. A combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator, a high-temperature regenerator, the second high-temperature heat exchanger and the second compressor. An evaporator has a vapor channel connected the second expander has a vapor channel connected the that a condenser has a liquid refrigerant pipe which passes through a pump and connects the evaporator, the second expander has a vapor channel which passes through a high-temperature regenerator and connects 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 second high-temperature heat exchanger and connects the expander, the expander has a low-pressure vapor channel connected the high-temperature heat regenerator, the evaporator has a low-pressure vapor channel connected the compressor and the third expander respectively has a vapor channel connected the 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 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. The expander, the second expander and the third expander connect the compressor and the pump and the second compressor and transmit power if necessary. 
     10. A combined cycle power device comprises an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator, a high-temperature regenerator, the fourth expander and the second high-temperature heat exchanger. An evaporator has a vapor channel connected the second expander has a vapor channel connected the that a condenser has a liquid refrigerant pipe which passes through a pump and connects the evaporator, the second expander has a vapor channel which passes through a high-temperature regenerator and connects 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 second high-temperature heat exchanger and connects the expander, the expander has a low-pressure vapor channel connected the high-temperature heat regenerator, the evaporator has a low-pressure vapor channel connected the compressor and the third expander respectively has a vapor channel connected the 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 ( 8 ) 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. The expander, the second expander, the third expander and the fourth expander connect the compressor and the pump and the second compressor and transmit power if necessary. 
     11. The device according to any one of claim  1 - 10 , 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. 
     
    
    
     In the figures,  1 —expander,  2 —the second expander,  3 —compressor,  4 —the third expander,  5 —pump,  6 —high-temperature heat exchanger,  7 —condenser,  8 —evaporator (waste heat boiler),  9 —high-temperature regenerator,  10 —the fourth expander,  11 —the second high-temperature heat exchanger,  12 —the heating unit,  13 —the second compressor,  14 —low-temperature regenerator,  15 —the second 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, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, a condenser and an evaporator. An evaporator  8  has a vapor channel connected the second expander  2  has a vapor channel connected the that a condenser  7  has a liquid refrigerant pipe which passes through a pump  5  and connects the evaporator  8 , the second expander  2  has a vapor channel connected 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 an expander  1 , the evaporator  8  has a low-pressure vapor channel connected the compressor  3  and the third expander  4  respectively has a vapor channel connected the that the expander  1  has a low-pressure vapor channel connected the evaporator  8 , the third expander  4  has a low-pressure vapor channel connected the condenser  7 . The high-temperature heat exchanger  6  has the heat source medium channel connected the outside, the condenser  7  has the cooling medium channel connected the outside, the evaporator  8  has the heat source medium channel connected the outside if necessary, the expander  1 , the second expander  2  and the third expander  4  connects the compressor  3  and transmit power. 
     (2) Working processes. The condensate of the condenser  7  flows through the pump  5  and enters into the evaporator  8  in which it absorbs heat, vaporizes and superheats, flows through the expander  2  to depressurize and output work 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  8  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 enters the condenser  7  to release heat and condense. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the evaporator  8 . The cooling medium takes away the low-temperature heat load through the condenser  7 . The expander  1 , the second expander  2  and the third expander  4  supply power to the compressor  3  and the outside. Or the expander  1 , the second expander  2  and the third expander  4  supply power to the compressor  3 , the pump  5  and the outside if necessary. The combined cycle power device is formed. 
     Combined with  FIG. 1 , what needs to be declared is: 
     {circle around (1)} In terms of structure: Reasons for adopting the expression “the expander  1 , the second expander  2  and the third expander  4  connect the compressor  3  and transmit power” is mainly used to indicate that the power required by the compressor  3  comes from the expander of the device itself rather than from the outside. It is not difficult to understand that the obvious connection is that the four devices are coaxially connected together. 
     {circle around (2)} Generally, the work output by expander  1  is greater than the power required by compressor  3 . The expression “the expander  1  connects compressor  3  and transmits power” can also be used. And combined with the expression “the expander  1  provides power to compressor  3 , and the expander  1 , the second expander  2  and the third expander  4  provide power to the outside” from the perspective of process, it reflects that “the expander  1 , the second expander  2  and the third expander  4  connect compressor  3  and transmit power”. But this is more cumbersome. 
     {circle around (3)} The applicant believes that for those skilled in the art, the expression “the expander  1 , the second expander  2  and the third expander  4  connect compressor  3  and transmit power” is clear, and will not cause trouble. 
     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, a condenser, an evaporator and a high-temperature regenerator. An evaporator  8  has a vapor channel connected the second expander  2  has a vapor channel connected the that a condenser  7  has a liquid refrigerant pipe which passes through a pump  5  and connects the evaporator  8 , the second expander  2  has a vapor channel which passes through a high-temperature regenerator  9  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  9 , the evaporator  8  has a low-pressure vapor channel connected the compressor  3  and the third expander  4  respectively has a vapor channel connected the that the high-temperature regenerator  9  has a low-pressure vapor channel connected the evaporator  8 , the third expander  4  has a low-pressure vapor channel connected the condenser  7 . The high-temperature heat exchanger  6  has the heat source medium channel connected the outside, the condenser  7  has the cooling medium channel connected the outside, the expander  1 , the second expander  2  and the third expander  4  connects the compressor  3  and transmit power. 
     (2) Working processes. The condensate of the condenser  7  flows through the pump  5  and enters into the evaporator  8  in which it absorbs heat, vaporizes and superheats, flows through the expander  2  to depressurize and output work, flows through the a high-temperature regenerator  9  for heat absorption and then enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from compressor  3  and flows through the high-temperature regenerator  9  for heat absorption 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 regenerator  9  and the evaporator  8  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 enters the condenser  7  to release heat and condense. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the evaporator  8 . The cooling medium takes away the low-temperature heat load through the condenser  7 . The expander  1 , the second expander  2  and the third expander  4  supply power to the compressor  3  and the outside. Or the expander  1 , the second expander  2  and the third expander  4  supply power to the compressor  3 , the pump  5  and the outside if necessary. 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, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator and the fourth expander. An evaporator  8  has a vapor channel connected the second expander  2  has a vapor channel connected the that a condenser  7  has a liquid refrigerant pipe which passes through a pump  5  and connects the evaporator  8 , the second expander  2  has a vapor channel connected the high-temperature heat exchanger  6 , the high-temperature heat exchanger  6  has a vapor channel which passes through a intermediate vapor inlet channel and connects the fourth expander  10 , the fourth expander  10  has a intermediate low-pressure vapor channel connected the evaporator  8 , the high-temperature heat exchanger  6  has a vapor channel connected the expander  1 , the expander  1  has a low-pressure vapor channel connected the evaporator  8 , the evaporator  8  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  7 . The high-temperature heat exchanger  6  has the heat source medium channel connected the outside, the condenser  7  has the cooling medium channel connected the outside, the expander  1 , the second expander  2 , the third expander  4  and the fourth expander  10  connect the compressor  3  and transmit power. 
     (2) Working processes. The condensate of the condenser  7  flows through the pump  5  and enters into the evaporator  8  in which it absorbs heat, vaporizes and superheats, flows through the expander  2  to depressurize and output work and then enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from compressor  3  and flows through the high-temperature exchanger  6  for heat absorption and enters the high-temperature heat exchanger  6  for heat absorption, and then is divided into two currents. The first current passes through a intermediate vapor inlet channel of the high-temperature heat exchanger  6  and connects the fourth expander  10  to depressurize and output work. The second current flows through the expander  1  to depressurize and output work. The low-pressure vapor discharged from the fourth expander  10  flows through a intermediate vapor inlet channel of the evaporator  8  and enters the evaporator  8 . The low-pressure vapor discharged from the expander enters the evaporator  8  and mixes the low-pressure vapor from the fourth expander  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 enters the condenser  7  to release heat and condense. 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  7 . The expander  1 , the second expander  2 , the third expander  4  and fourth expander  10  supply power to the compressor  3  and the outside. Or the expander  1 , the second expander  2 , the third expander  4  and fourth expander  10  supply power to the compressor  3 , the pump  5  and the outside if necessary. 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, a condenser, an evaporator and the second high-temperature heat exchanger. An evaporator  8  has a vapor channel which passes through the second high-temperature heat exchanger  11  and connects the second expander  2  has a vapor channel connected the that a condenser  7  has a liquid refrigerant pipe which passes through a pump  5  and connects the evaporator  8 , the second expander  2  has a vapor channel connected the high-temperature heat exchanger  6 , the 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 expander  1  has a low-pressure vapor channel connected the evaporator  8 , the evaporator  8  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  7 . The high-temperature heat exchanger  6  and the second high-temperature heat exchanger  11  have the heat source medium channel connected the outside respectively, the condenser  7  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  7  flows through the pump  5  and enters into the evaporator  8  in which it absorbs heat, vaporizes and superheats, flows through the high-temperature heat exchanger  6  for heat absorption and flows through the expander  2  to depressurize and output work and then enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from compressor  3  and enters the high-temperature heat exchanger  6  for heat absorption; The vapor discharged from the high-temperature heat exchanger  6  and passes through the expander  1  to depressurize and output work, The low-pressure vapor discharged from the expander  1  flows through the evaporator  8  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 enters the condenser  7  to release heat and condense. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the second high-temperature heat exchanger  11 . The cooling medium takes away the low-temperature heat load through the condenser  7 . The expander  1 , the second expander  2  and the third expander  4  supply power to the compressor  3  and the outside. Or the expander  1 , the second expander  2  and the third expander  4  supply power to the compressor  3 , the pump  5  and the outside if necessary. The combined cycle power device is formed. 
     What I want to explain here is that: In comparison, the evaporator  8  in  FIG. 1  can be regarded as the result of the combination of the evaporator  8  and the second high-temperature heat exchanger  11  in  FIG. 4 ; When the temperature difference of heat source medium is large, the layout of  FIG. 4  is reasonable. 
     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, a condenser, an evaporator and a heating unit. An evaporator  8  has a vapor channel connected the second expander  2  has a vapor channel connected the that a condenser  7  has a liquid refrigerant pipe which passes through a pump  5  and connects the evaporator  8 , the second expander  2  has a vapor channel connected the high-temperature heat exchanger  6 , the 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 heating unit  12  has a low-pressure vapor channel connected the compressor  3  and the third expander  4  respectively has a vapor channel connected the that the expander  1  has a low-pressure vapor channel connected the heating unit  12 , the third expander  4  has a low-pressure vapor channel connected the condenser  7 . The high-temperature heat exchanger  6  has the heat source medium channel connected the outside, the condenser  7  has the cooling medium channel connected the outside, the evaporator  8  has the heat source medium channel connected the outside, the heating unit  12  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  7  flows through the pump  5  and enters into the evaporator  8  in which it absorbs heat, vaporizes and superheats, flows through the expander  2  to depressurize and output work and then enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from compressor  3  and enters the high-temperature heat exchanger  6  for heat absorption; The vapor discharged from the high-temperature heat exchanger  6  and passes through the expander  1  to depressurize and output work, The low-pressure vapor discharged from the expander  1  flows through the heating unit  12  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 enters the condenser  7  to release heat and condense. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the evaporator  8 . The cooling medium takes away the low-temperature heat load through the condenser  7 . The heated medium takes away the medium temperature heat load through the heating unit  12 . The expander  1 , the second expander  2  and the third expander  4  supply power to the compressor  3  and the outside. Or the expander  1 , the second expander  2  and the third expander  4  supply power to the compressor  3 , the pump  5  and the outside if necessary. 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, a condenser, an evaporator and a heating unit. An evaporator  8  has a vapor channel connected the second expander  2  has a vapor channel connected the that a condenser  7  has a liquid refrigerant pipe which passes through a pump  5  and connects the evaporator  8 , the second expander  2  has a vapor channel connected the high-temperature heat exchanger  6 , the 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  8  has a low-pressure vapor channel connected the heating unit  12  has a vapor channel connected the that the expander  1  has a low-pressure vapor channel connected the evaporator  8 , the heating unit  12  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  7 . The high-temperature heat exchanger  6  has the heat source medium channel connected the outside, the condenser  7  has the cooling medium channel connected the outside, the heating unit  12  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  7  flows through the pump  5  and enters into the evaporator  8  in which it absorbs heat, vaporizes and superheats, flows through the expander  2  to depressurize and output work and then enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from compressor  3  and enters the high-temperature heat exchanger  6  for heat absorption; The vapor discharged from the high-temperature heat exchanger  6  and passes through the expander  1  to depressurize and output work, The low-pressure vapor discharged from the expander  1  flows through the evaporator  8  and the heating unit  12  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 enters the condenser  7  to release heat and condense. 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  7 . The heated medium takes away the medium temperature heat load through the heating unit  12 . The expander  1 , the second expander  2  and the third expander  4  supply power to the compressor  3  and the outside. Or the expander  1 , the second expander  2  and the third expander  4  supply power to the compressor  3 , the pump  5  and the outside if necessary. 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, a condenser, an evaporator, the second high-temperature heat exchanger and the second compressor. An evaporator  8  has a vapor channel connected the second expander  2  has a vapor channel connected the that a condenser  7  has a liquid refrigerant pipe which passes through a pump  5  and connects the evaporator  8 , the second expander  2  has a vapor channel connected the high-temperature heat exchanger  6 , the 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 second high-temperature heat exchanger  11  and connects the expander  1 , the evaporator  8  has a low-pressure vapor channel connected the compressor  3  and the third expander  4  respectively has a vapor channel connected the that the expander  1  has a low-pressure vapor channel connected the evaporator  8 , the third expander  4  has a low-pressure vapor channel connected the condenser  7 . The high-temperature heat exchanger  6  and the second high-temperature heat exchanger  11  have the heat source medium channel connected the outside, the condenser  7  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  7  flows through the pump  5  and enters into the evaporator  8  in which it absorbs heat, vaporizes and superheats, flows through the expander  2  to depressurize and output work and then enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from compressor  3  and enters the high-temperature heat exchanger  6  for heat absorption; The vapor discharged from the high-temperature heat exchanger  6  and passes through the second compressor  13  for pressure rise and temperature rise, flows through the second high-temperature heat exchanger  11  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  8  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 enters the condenser  7  to release heat and condense. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the second high-temperature heat exchanger  11 . The cooling medium takes away the low-temperature heat load through the condenser  7 . The expander  1 , the second expander  2  and the third expander  4  supply 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  supply power to the compressor  3 , the pump  5 , the second compressor  13  and the outside if necessary. 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, a condenser, an evaporator, the fourth expander and the second high-temperature heat exchanger. An evaporator  8  has a vapor channel connected the second expander  2  has a vapor channel connected the that a condenser  7  has a liquid refrigerant pipe which passes through a pump  5  and connects the evaporator  8 , the second expander  2  has a vapor channel connected the high-temperature heat exchanger  6 , the 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  10 , the fourth expander  10  has a vapor channel which passes through the second high-temperature heat exchanger  11  and connects the expander  1 , the evaporator  8  has a low-pressure vapor channel connected the compressor  3  and the third expander  4  respectively has a vapor channel connected the that the expander  1  has a low-pressure vapor channel connected the evaporator  8 , the third expander  4  has a low-pressure vapor channel connected the condenser  7 . The high-temperature heat exchanger  6  and the second high-temperature heat exchanger  11  have the heat source medium channel connected the outside, the condenser  7  has the cooling medium channel connected the outside, the expander  1 , the second expander  2 , the third expander  4  and the fourth expander  10  connect the compressor  3  and transmit power. 
     (2) Working processes. The condensate of the condenser  7  flows through the pump  5  and enters into the evaporator  8  in which it absorbs heat, vaporizes and superheats, flows through the expander  2  to depressurize and output work and then enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from compressor  3  and enters the high-temperature heat exchanger  6  for heat absorption; The vapor discharged from the high-temperature heat exchanger  6  and passes through the fourth expander  10  to depressurize and output work, flows through the second high-temperature heat exchanger  11  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  8  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 enters the condenser  7  to release heat and condense. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the second high-temperature heat exchanger  11 . The cooling medium takes away the low-temperature heat load through the condenser  7 . The expander  1 , the second expander  2 , the third expander  4  and fourth expander  10  supply power to the compressor  3  and the outside. Or the expander  1 , the second expander  2  and the third expander  4  and fourth expander  10  supply power to the compressor  3 , the pump  5  and the outside if necessary. 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, a condenser, an evaporator, a high-temperature regenerator, the second high-temperature heat exchanger and the second compressor. An evaporator  8  has a vapor channel connected the second expander  2  has a vapor channel connected the that a condenser  7  has a liquid refrigerant pipe which passes through a pump  5  and connects the evaporator  8 , the second expander  2  has a vapor channel which passes through a high-temperature regenerator  9  and connects 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 second high-temperature heat exchanger  11  and connects the expander  1 , the expander  1  has a low-pressure vapor channel connected the high-temperature regenerator  9 , the evaporator  8  has a low-pressure vapor channel connected the compressor  3  and the third expander  4  respectively has a vapor channel connected the that the high-temperature regenerator  9  has a low-pressure vapor channel connected the evaporator  8 , the third expander  4  has a low-pressure vapor channel connected the condenser  7 . The high-temperature heat exchanger  6  and the second high-temperature heat exchanger  11  have the heat source medium channel connected the outside, the condenser  7  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  7  flows through the pump  5  and enters into the evaporator  8  in which it absorbs heat, vaporizes and superheats, flows through the expander  2  to depressurize and output work, flows through the high-temperature regenerator  9  for heat absorption, and then enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from compressor  3  flows through the high-temperature regenerator  9  and enters the high-temperature heat exchanger  6  for heat absorption; The vapor discharged from the high-temperature heat exchanger  6  and passes through the compressor  13  for pressure rise and temperature rise, flows through the second high-temperature heat exchanger  11  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 high-temperature regenerator  9  and the evaporator  8  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 enters the condenser  7  to release heat and condense. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the second high-temperature heat exchanger  11 . The cooling medium takes away the low-temperature heat load through the condenser  7 . The expander  1 , the second expander  2 , the third expander  4  and fourth expander  10  supply 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  and fourth expander  10  supply power to the compressor  3 , the second compressor  13 , the pump  5  and the outside if necessary. 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, a condenser, an evaporator, a high-temperature regenerator, the fourth expander and the second high-temperature heat exchanger. An evaporator  8  has a vapor channel connected the second expander  2  has a vapor channel connected the that a condenser  7  has a liquid refrigerant pipe which passes through a pump  5  and connects the evaporator  8 , the second expander  2  has a vapor channel which passes through a high-temperature regenerator  9  and connects the high-temperature heat exchanger  6 , the high-temperature heat exchanger  6  has a vapor channel connected the fourth expander  10 , the fourth expander  10  has a vapor channel which passes through the second high-temperature heat exchanger  11  and connects the expander  1 , the expander  1  has a low-pressure vapor channel connected the high-temperature regenerator  9 , the evaporator  8  has a low-pressure vapor channel connected the compressor  3  and the third expander  4  respectively has a vapor channel connected the that the high-temperature regenerator  9  has a low-pressure vapor channel connected the evaporator  8 , the third expander  4  has a low-pressure vapor channel connected the condenser  7 . The high-temperature heat exchanger  6  and the second high-temperature heat exchanger  11  have the heat source medium channel connected the outside, the condenser  7  has the cooling medium channel connected the outside, the expander  1 , the second expander  2 , the third expander  4  and the fourth expander  10  connect the compressor  3  and transmit power. 
     (2) Working processes. The condensate of the condenser  7  flows through the pump  5  and enters into the evaporator  8  in which it absorbs heat, vaporizes and superheats, flows through the expander  2  to depressurize and output work, flows through the high-temperature regenerator  9  for heat absorption, and then enters the high-temperature heat exchanger  6  for heat absorption. The vapor discharged from compressor  3  flows through the high-temperature regenerator  9  and enters the high-temperature heat exchanger  6  for heat absorption; The vapor discharged from the high-temperature heat exchanger  6  and connects the fourth expander  10 , the fourth expander  10  flows through the second high-temperature heat exchanger  11  for heat absorption and enters the expander  1  to depressurize and output work. The low-pressure vapor discharged from the expander  1  connected the high-temperature regenerator  9  and the evaporator  8  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 enters the condenser  7  to release heat and condense. The heat source medium supplies the driving heat load through the high-temperature heat exchanger  6  and the second high-temperature heat exchanger  11 . The cooling medium takes away the low-temperature heat load through the condenser  7 . The expander  1 , the second expander  2 , the third expander  4  and fourth expander  10  supply power to the compressor  3  and the outside. Or the expander  1 , the second expander  2  and the third expander  4  and fourth expander  10  supply power to the compressor  3 , the pump  5  and the outside if necessary. The combined cycle power device is formed. 
     The combined cycle power device in  FIG. 11  works as follows: 
     (1) Device structure. The device according to any one of  FIG. 1  to  FIG. 11 , wherein adding the low-temperature regenerator and the second pump, adjusting that the condenser  7  has a liquid refrigerant pipe which passes through a pump  5  and connects the evaporator  8  to that the condenser  7  has a liquid refrigerant pipe which passes through a pump  5  and connects a low-temperature regenerator  14 , the compressor  3  adds the vapor extraction channel connected the low-temperature regenerator  14 , the low-temperature regenerator  14  has a liquid refrigerant pipe which passes through the second pump  15  and connects the evaporator  8 , a combined cycle power device is formed. 
     (2) Working processes. The condensate of the condenser  7  flows through the pump  5  and enters the low-temperature regenerator  14  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  14  flows through the second pump  15  and enters the evaporator  8  in which it absorbs heat, vaporizes and superheats, flows through the second expander  2  to depressurize and output work, 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  8  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 enters the condenser  7  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  12  to release heat and condense 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 evaporator  8 . The cooling medium takes away the low-temperature heat load through the condenser  7 . The expander  1 , the second expander  2  and the third expander  4  supply power to the compressor  3  and the outside. Or the expander  1 , the second expander  2  and the third expander  4  supply power to the compressor  3 , the pump  5 , the second pump  15  and the outside if necessary. 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 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. 
     (8) 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. 
     (9) The present invention can realize the heat recovery of enterprise device simply, actively, safely and efficiently. 
     (10) The thermal efficiency improves effectively when the present invention is applied to the lower end of the gas-steam combined cycle. 
     (11) 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.