TWI755021B - Integrated thermal cycling system - Google Patents

Abstract

This present disclosure provides an integrated thermal cycling system including an organic rankine sub-cycle system, an absorption refrigeration sub-cycle system and a cooling sub-cycle system. The organic rankine sub-cycle system includes an organic rankine condenser and a first working fluid. The absorption refrigeration sub-cycle system includes a second working fluid, an absorption refrigeration generator, an absorption refrigeration condenser, an absorption refrigeration evaporator and an absorption refrigeration absorber. The cooling sub-cycle system includes a cooling fluid that flows through the absorption refrigeration evaporator and the organic rankine condenser to form a loop. The cooling fluid flows through the organic rankine condenser and absorbs a thermal energy released by the liquefaction of the first working fluid. The cooling fluid flows through the absorption refrigeration evaporator and provides a part of the thermal energy to vaporize the refrigerant, and then flows back to the organic Rankine condenser. Therefore, the efficiency of the organic rankine sub-cycle system is improved.

Description

Compound Thermal Cycle System

The present invention relates to a thermal cycle system, and in particular to a composite thermal cycle system combining organic Rankine cycle and absorption refrigeration cycle.

The organic Rankine cycle is a technology that effectively recovers waste heat sources and converts them into electrical energy. It is derived from the Rankine cycle (or vapor Rankine cycle), which uses the working fluid in a high temperature and high pressure state to work through an expansion valve and then condense it. Liquid fluids to low temperature and low pressure and circulate accordingly, and usually use organic compounds with lower boiling points as working fluids.

With the rise of environmental awareness, the impact of organic fluids on the environment has also been paid more attention. Some refrigerants that can produce higher efficiency, such as R123, R134a, etc., are therefore prohibited from being used, and it is necessary to find another way to improve efficiency.

In view of this, how to further improve the thermal efficiency of the organic Rankine cycle system has become the goal of the relevant industry.

According to an embodiment of the present invention, a compound thermal cycle system is provided, which includes an organic Rankine sub-cycle system, an absorption refrigeration sub-cycle system, and a cooling sub-cycle system. The organic Rankine sub-circulation system includes an organic Rankine condenser and a first working fluid. The first working fluid flows through the organic Rankine condenser and releases a heat energy to the organic Rankine condenser for liquefaction. The absorption refrigeration sub-circulation system includes a second working fluid, an absorption refrigeration generator, an absorption refrigeration condenser, an absorption refrigeration evaporator and an absorption refrigeration absorber, and the second working fluid includes a refrigerant and An absorbent, the absorption refrigerating generator heats the second working fluid to vaporize the refrigerant, the absorption refrigerating condenser is used to cool down and liquefy the vaporized refrigerant, and the absorption refrigerating evaporator heats to cool down and liquefy the refrigerant after depressurization The refrigerant is re-vaporized, and the absorption refrigeration absorber is connected to the absorption refrigeration evaporator, and is used to combine the refrigerant and the absorbent to become the second working fluid again. The cooling secondary circulation system includes a cooling fluid, and the cooling fluid flows through the absorption refrigeration evaporator and the organic Rankine condenser to form a loop, wherein the cooling fluid flows through the organic Rankine condenser and absorbs the heat energy released by the liquefaction of the first working fluid , the cooling fluid flows through the absorption refrigeration evaporator, and after providing at least a part of the thermal energy to vaporize the refrigerant, the cooling fluid flows back to the organic Rankine condenser.

In this way, the cooling fluid obtains thermal energy from the organic Rankine sub-circulation system, reduces the heat energy to the absorption refrigeration sub-circulation system to reduce itself to below room temperature, and then returns to the organic Rankine sub-circulation system to further reduce the first working fluid. The condensing temperature can effectively improve the thermal efficiency and power generation of the organic Rankine cycle system.

According to the compound thermal cycle system of the foregoing embodiment, the organic Rankine sub-cycle system further comprises an organic Rankine evaporator, an organic Rankine pump and an organic Rankine expander. The organic Rankine evaporator vaporizes the first working fluid after liquefaction at high pressure, and the organic Rankine pump sends the first working fluid through the organic Rankine condenser to the organic Rankine evaporator, and the organic Rankine expander receives the high pressure vaporization. The first working fluid is used to depressurize the first working fluid after high-pressure vaporization, and at the same time, the organic Rankine expander is driven to generate a rotating shaft work. The organic Rankine condenser receives the depressurized first working fluid to release heat energy, and the first working fluid flows through the organic Rankine condenser, the organic Rankine pump, the organic Rankine evaporator and the organic Rankine expander to form a circuit.

According to the compound thermal cycle system of the foregoing embodiment, the organic Rankine sub-cycle system further includes a recuperator, which includes a first high temperature part and a first low temperature part, and the first working fluid flows through the organic Rankine expander After depressurization, a waste heat is absorbed by the first high temperature part, and the first low temperature part provides the waste heat to the first working fluid before flowing into the organic Rankine evaporator for preheating.

The composite thermal cycle system according to the foregoing embodiment further includes a heat source, which first flows through the organic Rankine evaporator, and then flows through the absorption refrigeration generator.

According to the composite thermal cycle system of the aforementioned embodiment, the cooling secondary cycle system further comprises a cooling water tower and a cooling pump. After the cooling fluid flows through the organic Rankine condenser, it flows through the cooling water tower, and then flows through the cooling pump to It is sent to the absorption refrigeration evaporator and finally returned to the organic Rankine condenser.

According to another embodiment of the present invention, a composite thermal cycle system includes an organic Rankine sub-cycle system, an absorption refrigeration sub-cycle system, a cooling sub-cycle system, and at least one composite recuperator. The organic Rankine sub-circulation system includes an organic Rankine condenser and a first working fluid. The first working fluid flows through the organic Rankine condenser and releases a heat energy to the organic Rankine condenser for liquefaction. The absorption refrigeration sub-circulation system includes a second working fluid, an absorption refrigeration generator, an absorption refrigeration condenser, an absorption refrigeration evaporator and an absorption refrigeration absorber, and the second working fluid includes a refrigerant and An absorbent, the absorption refrigerating generator heats the second working fluid to vaporize the refrigerant, the absorption refrigerating condenser is used to cool down and liquefy the vaporized refrigerant, and the absorption refrigerating evaporator heats to cool down and liquefy the refrigerant after depressurization The refrigerant is re-vaporized, and the absorption refrigeration absorber is connected to the absorption refrigeration evaporator, and is used to combine the refrigerant and the absorbent to become the second working fluid again. The cooling secondary circulation system includes a cooling fluid, and the cooling fluid flows through the absorption refrigeration evaporator and the organic Rankine condenser to form a circuit. The aforementioned at least one compound recuperator preheats the second working fluid with the first working fluid, or preheats the first working fluid with the second working fluid. The cooling fluid flows through the organic Rankine condenser and absorbs the heat energy released by the liquefaction of the first working fluid, and the cooling fluid flows through the absorption refrigeration evaporator and provides at least a part of the heat energy to vaporize the refrigerant, and then the cooling fluid flows back to Organic Rankine Condenser.

According to the compound thermal cycle system of the second embodiment, the organic Rankine sub-cycle system further comprises an organic Rankine evaporator, an organic Rankine pump and an organic Rankine expander. The organic Rankine evaporator vaporizes the liquefied first working fluid under high pressure. The organic Rankine pump sends the first working fluid passing through the organic Rankine condenser to the organic Rankine evaporator. The organic Rankine expander receives the high-pressure vaporized first working fluid to depressurize the high-pressure vaporized first working fluid, while the organic Rankine expander is driven to generate a rotating shaft work. The organic Rankine condenser receives the depressurized first working fluid to release heat energy, and the first working fluid flows through the organic Rankine pump, the organic Rankine evaporator, the organic Rankine expander and the organic Rankine condenser to form a loop.

According to the compound thermal cycle system according to the second embodiment, the number of at least one compound recuperator is two, and one compound recuperator absorbs one of the first working fluids discharged after flowing through the organic Rankine expander The first releases heat and preheats the remixed second working fluid before flowing into the absorption refrigeration generator; the other compound recuperator absorbs a second working fluid released by the vaporized refrigerant flowing through the absorption refrigeration generator. Heat is released and the first working fluid is preheated before flowing into the organic Rankine evaporator.

Please refer to FIG. 1, wherein FIG. 1 shows a block diagram of a compound thermal cycle system 10 according to a first embodiment of the present invention. As can be seen from FIG. 1 , the composite thermal cycle system 10 includes an organic Rankine sub-cycle system 100 , an absorption refrigeration sub-cycle system 200 and a cooling sub-cycle system 300 . The organic Rankine sub-cycle system 100 includes an organic Rankine condenser 110 and a first working fluid 120. The first working fluid 120 flows through the organic Rankine condenser 110 and releases a thermal energy (not shown) to the organic Rankine Condenser 110 for liquefaction. The absorption refrigeration secondary cycle system 200 includes a second working fluid 210, an absorption refrigeration generator 220, an absorption refrigeration condenser 230, an absorption refrigeration evaporator 240 and an absorption refrigeration absorber 290. The second working fluid The fluid 210 includes a refrigerant 211 and an absorbent 212. The absorption refrigeration generator 220 heats the second working fluid 210 to vaporize the refrigerant 211 and separate it from the absorbent 212. The absorption refrigeration condenser 230 is used to make the vaporized The refrigerant 211 is cooled and liquefied, and the refrigerant 211 after being depressurized by the absorption expansion valve 260 absorbs the external heat source and evaporates in the absorption refrigeration evaporator 240. The absorption refrigeration absorber 290 is connected to the absorption refrigeration evaporator 240 to make the refrigerant 211 and the absorbent 212 combine and become the second working fluid 210 with a higher concentration again. The cooling secondary circulation system 300 includes a cooling fluid 310, the cooling fluid 310 flows through the absorption refrigeration evaporator 240 and the organic Rankine condenser 110 to form a loop, wherein the cooling fluid 310 flows through the organic Rankine condenser 110 and absorbs the first The heat energy released by the liquefaction of the working fluid 120, and then the cooling fluid 310 can first flow through the cooling water tower 320 to dissipate a part of the heat energy to reduce to about the ambient temperature, and then flow through the absorption refrigeration evaporator 240, and provide at least a part of the heat energy for refrigeration After the agent 211 is vaporized, the cooling fluid 310 flows back to the organic Rankine condenser 110 .

In this way, the cooling fluid 310 obtains thermal energy from the organic Rankine sub-cycle system 100, and the heat energy is absorbed by the refrigeration sub-cycle system 200 to reduce itself to below room temperature, and then returns to the organic Rankine sub-cycle system 100, so that the first The working fluid 120 further reduces the condensation temperature, which can effectively improve the thermal efficiency and power generation of the organic Rankine cycle system 100 .

Specifically, the organic Rankine sub-cycle system 100 further includes an organic Rankine evaporator 140 , an organic Rankine pump 130 and an organic Rankine expander 150 . After the first working fluid 120 flows through the organic Rankine condenser 110 to be liquefied, it is sent to the organic Rankine evaporator 140 by the organic Rankine pump 130 in a pressurized manner. The first working fluid 120 is vaporized at high pressure. After the high-pressure vaporization, the first working fluid 120 enters the organic Rankine expander 150 to expand and depressurize and generate a rotating shaft work. The rotating shaft work drives the organic Rankine generator 160 to generate electricity through the connector. The organic Rankine condenser 110 receives the depressurized first working fluid 120 (ie, passes through the organic Rankine expander 150 ) to release heat energy. In other words, the first working fluid 120 may flow through the organic Rankine condenser 110 , the organic Rankine pump 130 , the organic Rankine evaporator 140 and the organic Rankine expander 150 to form a loop. The organic Rankine generator 160 is connected to the organic Rankine expander 150, and the first working fluid 120 can push the organic Rankine expander 150 such as: scroll, single screw, twin screw and turbine and other rotating elements to generate rotating shaft work, Further, the rotating shaft work is converted into electrical energy through the organic Rankine generator 160 . The first working fluid 120 can be pure refrigerant, such as R123, R134a, R245fa, R1234yf or mixed refrigerant, such as R245fa/R134a mixed fluid or R245fa/R1234yf mixed fluid, but the present invention is not limited thereto.

The absorption refrigeration secondary cycle system 200 may further include an absorption decompression valve 280 , an absorption expansion valve 260 , an absorption refrigeration heat exchanger 270 and an absorption refrigeration pump 250 . The refrigerant 211 and the absorbent 212 have different boiling points respectively (the boiling point of the refrigerant 211 is lower than that of the absorbent 212) and are fully mixed. The composition of the mixed fluid can be, for example, ammonia plus water or water plus lithium bromide. After the refrigerant 211 is vaporized and separated, the absorbent 212 flows into the absorption decompression valve 280 , and the absorption decompression valve 280 depressurizes the absorbent 212 . The absorption refrigeration absorber 290 remixes the refrigerant 211 passing through the absorption refrigeration evaporator 240 and the absorbent 212 passing through the absorption decompression valve 280 into a second working fluid 210 with a higher concentration. The absorption refrigeration heat exchanger 270 includes a second high temperature part 271 and a second low temperature part 272, and the absorbent 212 that has not been depressurized by the absorption pressure reducing valve 280 is absorbed through the second high temperature part 271 of the absorption refrigeration heat exchanger 270 The second low temperature portion 272 provides waste heat to preheat the remixed second working fluid 210 before the remixed second working fluid 210 flows into the absorption refrigeration generator 220 . The absorption refrigeration pump 250 sends the remixed second working fluid 210 to the absorption refrigeration generator 220 . The refrigerant 211 after passing through the absorption refrigeration condenser 230 flows through the absorption refrigeration evaporator 240 for vaporization (absorbing heat energy from the cooling fluid 310 and cooling the cooling fluid 310), and the refrigerant 211 flows through the absorption refrigeration The generator 220, the absorption refrigeration condenser 230, the absorption refrigeration evaporator 240, the absorption refrigeration absorber 290 and the absorption refrigeration pump 250 form a circuit.

The cooling secondary circulation system 300 further includes a cooling water tower 320 and a cooling pump 330. The cooling fluid 310 flows through the organic Rankine condenser 110 and absorbs the heat energy released by the liquefaction of the first working fluid 120, and then flows through the cooling water tower 320 for preliminary operation. After cooling to release a part of the heat energy, it is cooled to a temperature close to the ambient temperature, and then flows through the cooling pump 330 to be sent to the absorption refrigeration evaporator 240, and part of the heat energy is transferred to the refrigerant 211 to vaporize the refrigerant 211, The cooling fluid 310 is further cooled (below ambient temperature) and finally returned to the organic Rankine condenser 110 to complete the cycle.

The composite thermal cycle system 10 according to the foregoing embodiment further includes a heat source 400 that first flows through the organic Rankine evaporator 140 to provide a high-temperature heat energy (not shown) to the organic Rankine evaporator 140 to make the first heat source 400 . A working fluid 120 is vaporized and then flows through the absorption refrigeration generator 220 to provide the remaining part of the high temperature heat energy to the absorption refrigeration generator 220, which is just enough to make the refrigerant 211 with a lower boiling point in the second working fluid 210 Vaporized and separated from the higher boiling absorbent 212.

Please refer to FIG. 2, wherein FIG. 2 is a block diagram of a compound thermal cycle system 10a according to a second embodiment of the present invention. The configuration of the composite thermal cycle system 10a is similar to that of the composite thermal cycle system 10 in FIG. 1, including an organic Rankine sub-cycle system 100a, an absorption refrigeration sub-cycle system 200a and a cooling sub-cycle system 300a. The organic Rankine sub-cycle system 100a is similar to the organic Rankine sub-cycle system 100 in FIG. 1, and includes a first working fluid 120a, an organic Rankine condenser 110a, an organic Rankine pump 130a, an organic Rankine evaporator 140a and an organic Rankine expander 150a; absorption refrigeration sub-cycle system 200a is similar to absorption refrigeration sub-cycle system 200 in FIG. 1, including second working fluid 210a, absorption refrigeration generator 220a, absorption refrigeration condenser 230a, absorption expansion Valve 260a, absorption refrigeration evaporator 240a, absorption refrigeration absorber 290a, absorption pressure reducing valve 280a, absorption refrigeration pump 250a and absorption refrigeration heat exchanger 270a, the second working fluid 210a also includes refrigerant 211a and The absorbent 212a; the cooling sub-circulation system 300a is similar to the cooling sub-circulation system 300 in FIG. 1, and includes a cooling fluid 310a, a cooling water tower 320a and a cooling pump 330a. The difference is that the organic Rankine sub-cycle system 100a further includes a recuperator 170a, which includes a first high temperature portion 171a and a first low temperature portion 172a, and the first working fluid 120a vaporized at high pressure flows through the organic Rankine expander 150a After depressurization (at the same time accompanied by a cooling effect), it passes through the first high temperature portion 171a and absorbs a waste heat (not shown), so that the first working fluid 120a can be cooled to a certain degree before flowing into the organic Rankine condenser 110a The waste heat can be provided to the first working fluid 120a before flowing into the organic Rankine evaporator 140a through the first low temperature portion 172a, so as to preheat the first working fluid 120a.

Please refer to FIG. 3, wherein FIG. 3 is a block diagram of a compound thermal cycle system 10b according to a third embodiment of the present invention. The configuration of the composite thermal cycle system 10b is similar to that of the composite thermal cycle system 10 in FIG. 1, including an organic Rankine sub-cycle system 100b, an absorption refrigeration sub-cycle system 200b and a cooling sub-cycle system 300b. The organic Rankine sub-cycle system 100b is similar to the organic Rankine sub-cycle system 100 in FIG. 1, and includes a first working fluid 120b, an organic Rankine condenser 110b, an organic Rankine pump 130b, an organic Rankine evaporator 140b and an organic Rankine sub-cycle system 100b. Rankine expander 150b; absorption refrigeration sub-cycle system 200b is similar to absorption refrigeration sub-cycle system 200 in FIG. 1, including second working fluid 210b, absorption refrigeration generator 220b, absorption refrigeration condenser 230b, absorption expansion valve 260b, absorption refrigeration evaporator 240b, absorption refrigeration absorber 290b, absorption pressure reducing valve 280b, absorption refrigeration pump 250b and absorption refrigeration heat exchanger 270b, the second working fluid 210b also includes refrigerant 211b and The absorbent 212b; the cooling sub-circulation system 300b is similar to the cooling sub-circulation system 300 in FIG. 1, and includes a cooling fluid 310b, a cooling water tower 320b and a cooling pump 330b. However, the compound thermal cycle system 10b further includes at least one compound recuperator 510b and 520b. At least one compound recuperator 510b, 520b preheats the second working fluid 210b with the first working fluid 120b, or preheats the first working fluid 120b with the second working fluid 210b, so that the use of thermal energy can be more efficient.

In the third embodiment, the number of the compound recuperators 510b and 520b may be two, and the compound recuperator 510b absorbs one of the first heat released after the first working fluid 120b flows through the organic Rankine expander 150b (not shown), and preheat the remixed second working fluid 210b before flowing into the absorption refrigeration generator 220b, so that the second working fluid 210b can be preheated with the first working fluid 120b; another compound recuperator 520b absorbs a second release heat (not shown) released by the vaporized refrigerant 211b flowing through the absorption refrigeration generator 220b, and preheats the first working fluid 120b before flowing into the organic Rankine evaporator 140b, so as to be able to The first working fluid 120b is preheated with the second working fluid 210b. The compound recuperators 510b and 520b utilize the temperature difference between the organic Rankine sub-cycle system 100b and the absorption refrigeration sub-cycle system 200b to perform heat exchange, and can be configured in the compound heat cycle system 10b according to actual needs in any effective The position of improving the thermal efficiency of the system does not limit the present invention.

Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Anyone skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention The scope shall be determined by the scope of the appended patent application.

10, 10a, 10b: Compound Thermal Cycle System 100, 100a, 100b: Organic Rankine Cycle System 110, 110a, 110b: Organic Rankine Condensers 120, 120a, 120b: the first working fluid 130, 130a, 130b: Organic Rankine Pumping 140, 140a, 140b: Organic Rankine Evaporators 150, 150a, 150b: Organic Rankine Expanders 160: Organic Rankine Generator 170a: Recuperator 171a: First high temperature section 172a: First Cryogenic Section 200, 200a, 200b: Absorption refrigeration secondary cycle system 210, 210a, 210b: Second working fluid 211, 211a, 211b: Refrigerants 212, 212a, 212b: Absorbents 220, 220a, 220b: Absorption Refrigeration Generators 230, 230a, 230b: Absorption refrigeration condensers 240, 240a, 240b: Absorption refrigeration evaporators 250, 250a, 250b: Absorption Refrigeration Pumps 260, 260a, 260b: Absorption expansion valve 270, 270a, 270b: Absorption refrigeration heat exchangers 271: Second high temperature section 272: Second Cryogenic Section 280, 280a, 280b: Absorption relief valve 290, 290a, 290b: Absorption refrigeration absorbers 300, 300a, 300b: cooling secondary circulation system 310, 310a, 310b: Cooling Fluids 320, 320a, 320b: Cooling water towers 330, 330a, 330b: Cooling Pumps 400: heat source 510b, 520b: Compound recuperators

FIG. 1 shows a block diagram of a compound thermal cycle system according to a first embodiment of the present invention; FIG. 2 shows a block diagram of a compound thermal cycle system according to a second embodiment of the present invention; and FIG. 3 shows a block diagram of a compound thermal cycle system according to a third embodiment of the present invention.

10: Composite thermal cycle system

100: Organic Rankine Cycle System

110: Organic Rankine Condenser

120: The first working fluid

130: Organic Rankine Pump

140: Organic Rankine Evaporator

150: Organic Rankine Expander

160: Organic Rankine Generator

200: Absorption refrigeration secondary circulation system

210: Second working fluid

211: Refrigerant

212: Absorbent

220: Absorption Refrigeration Generator

230: Absorption refrigeration condenser

240: Absorption refrigeration evaporator

250: Absorption refrigeration pump

260: Absorption expansion valve

270: Absorption Refrigeration Heat Exchanger

271: Second high temperature section

272: Second Cryogenic Section

280: Absorption pressure reducing valve

290: Absorption refrigeration absorber

300: cooling secondary circulation system

310: Cooling Fluid

320: Cooling water tower

330: Cooling Pump

400: heat source

Claims (6)

A compound thermal cycle system, comprising: an organic Rankine sub-cycle system, which includes: an organic Rankine condenser; a first working fluid, which flows through the organic Rankine condenser, and releases a heat energy to the organic Rankine condenser Rankine condenser for liquefaction; an organic Rankine evaporator to vaporize the first working fluid at high pressure after liquefaction; an organic Rankine pump to send the first working fluid passing through the organic Rankine condenser to a the organic Rankine evaporator; and an organic Rankine expander for receiving the first working fluid after high-pressure vaporization, so as to depressurize the first working fluid after the high-pressure vaporization, while the organic Rankine expander is driven to A rotating shaft work is generated, wherein the organic Rankine condenser receives the depressurized first working fluid to release the heat energy, and the first working fluid flows through the organic Rankine condenser and the organic Rankine pump Pu, the organic Rankine evaporator and the organic Rankine expander to form a loop; an absorption refrigeration sub-circulation system, which includes: a second working fluid, including a refrigerant and an absorbent; an absorption refrigeration generator The second working fluid is heated to vaporize the refrigerant; an absorption refrigerating condenser is used to cool down and liquefy the refrigerant after vaporization; an absorption refrigerating evaporator is heated to cool down and liquefy and depressurize the refrigerant. The refrigerant is re-evaporated; and an absorption refrigeration absorber is connected to the absorption refrigeration evaporator, and is used for combining the refrigerant and the absorbent to become the second working fluid again; and a cooling secondary circulation system, including a cooling fluid, the cooling fluid flows through the absorption refrigeration evaporator and the organic Rankine condenser to form a circuit, wherein the cooling fluid flows through the organic Rankine condenser and absorbs the liquefaction of the first working fluid. The thermal energy and the cooling fluid flow through the absorption refrigeration evaporator, and after providing at least a part of the thermal energy to vaporize the refrigerant, the cooling fluid flows back to the organic Rankine condenser. The compound thermal cycle system according to claim 1, wherein the organic Rankine subcycle system further comprises a recuperator comprising a first high temperature part and a first low temperature part, the first working fluid flows through the first working fluid After the organic Rankine expander is depressurized, a waste heat is absorbed through the first high temperature part, and the first low temperature part provides the waste heat to the first working fluid before flowing into the organic Rankine evaporator for preheating. The composite thermal cycle system according to claim 1, further comprising: a heat source, which first flows through the organic Rankine evaporator, and then flows through the absorption refrigeration generator. The composite thermal cycle system of claim 1, wherein The cooling sub-circulation system further includes a cooling water tower and a cooling pump, the cooling fluid flows through the organic Rankine condenser, then flows through the cooling water tower, and then flows through the cooling pump to be sent to the absorption refrigeration evaporation and finally back to the organic Rankine condenser. A compound thermal cycle system, comprising: an organic Rankine sub-cycle system, which includes: an organic Rankine condenser; a first working fluid, which flows through the organic Rankine condenser, and releases a heat energy to the organic Rankine condenser Rankine condenser for liquefaction; an organic Rankine evaporator to vaporize the first working fluid after liquefaction at high pressure; an organic Rankine pump to send the first working fluid passed through the organic Rankine condenser to the an organic Rankine evaporator; and an organic Rankine expander for receiving the first working fluid after high pressure vaporization to depressurize the first working fluid after high pressure vaporization, while the organic Rankine expander is driven to generate A rotating shaft work, wherein the organic Rankine condenser receives the depressurized first working fluid to release the heat energy, and the first working fluid flows through the organic Rankine pump and the organic Rankine evaporator , the organic Rankine expander and the organic Rankine condenser to form a loop; an absorption refrigeration secondary cycle system, which includes: a second working fluid, including a refrigerant and an absorbent; an absorption refrigeration generator , heating the second working fluid to vaporize the Refrigerant; an absorption refrigerating condenser for cooling and liquefying the vaporized refrigerant; an absorption refrigerating evaporator for heating to make the cooled liquefied and depressurized refrigerant vaporized again; and an absorption refrigerating an absorber, connected to the absorption refrigeration evaporator, and used for combining the refrigerant and the absorbent to become the second working fluid again; a cooling sub-circulation system including a cooling fluid, the cooling fluid flowing through the absorption type a refrigeration evaporator and the organic Rankine condenser to form a circuit; and at least one compound recuperator for preheating the second working fluid with the first working fluid, or preheating the first working fluid with the second working fluid Fluid; wherein, the cooling fluid flows through the organic Rankine condenser and absorbs the thermal energy released by the liquefaction of the first working fluid, the cooling fluid flows through the absorption refrigeration evaporator, and provides at least a part of the thermal energy to make After the refrigerant is vaporized, the cooling fluid flows back to the organic Rankine condenser. The compound thermal cycle system of claim 5, wherein the number of the at least one compound recuperator is two, and one of the compound recuperators absorbs the first working fluid after flowing through the organic Rankine expander One of the first released heat is released to preheat the second working fluid that is remixed before flowing into the absorption refrigeration generator; The refrigerant released by a second release heat and preheat the first working fluid before flowing into the organic Rankine evaporator.

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