Poly-generation system and method integrating hydrogen production, power generation, refrigeration and seawater flash evaporation

Abstract

The invention relates to a hydrogen production, power generation, refrigeration and seawater flash evaporation integrated poly-generation system and method. The poly-generation system comprises an electrolysis system, a hydrogen gas turbine cycle power generation system, a refrigeration system and a seawater flash evaporation desalination system. The electrolysis system utilizes electric power of the renewable energy power generation system to electrolyze water to produce hydrogen; the hydrogen gas turbine cycle power generation system drives a turbine by using steam generated by combustion of hydrogen generated by an electrolysis system so as to drive a generator to generate power, and exhaust steam at the tail end of the turbine is condensed and then flows back to a combustion chamber through a water return pipeline; a generator of the refrigerating system exchanges heat with a refrigerant by using steam of the hydrogen gas turbine circulating power generation system; and the seawater flash evaporation desalination system exchanges heat with seawater by using steam discharged by the refrigerating system. According to the invention, on the basis of solving the problem of renewable energy power generation power consumption, multi-yield combination of hydrogen production, power generation, refrigeration and seawater desalination is realized, and the utilization rate of renewable energy power generation power is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of renewable energy power multiple utilization, in particular to a multi-generation system and method integrating hydrogen production, power generation, refrigeration and seawater flash evaporation. BACKGROUND

[0002] With the development of renewable energy in China, the installed capacity of wind power / photovoltaic power is gradually increasing. However, due to the volatility of wind power / photovoltaic power generation, there is still a problem of power consumption in renewable energy power generation. At present, there is still the problem of abandoned wind power and abandoned light, which leads to the inability to improve the utilization rate of renewable energy power generation. The consumption of green electricity has become a problem that needs to be solved in the development of renewable energy in China.

[0003] The proton exchange membrane electrolysis cell hydrogen production technology uses a solid-state proton exchange membrane as an electrolyte to decompose water to produce hydrogen, with an efficiency of 70% to 80%. Compared with traditional alkaline electrolysis cells, the proton exchange membrane electrolysis cell has the advantages of compact structure, fast dynamic response (second-level adjustment), rapid cold start, and high hydrogen purity. Moreover, the proton exchange membrane electrolysis cell has a high outlet water temperature, which can reach 70℃ to 95℃.

[0004] Hydrogen combustion power generation technology uses hydrogen as fuel to generate high-temperature and high-pressure steam for power generation by utilizing the heat released by combustion. Its power generation system layout is simple, mainly including a combustion chamber, a gas turbine and a steam turbine, with the characteristics of fast response speed and high efficiency.

[0005] The refrigeration system includes a generator, a condenser, an evaporator and an absorber forming a cycle. The refrigerant is heated and evaporated in the generator, the hot steam enters the condenser to exchange heat with the cooling water and condenses, then enters the evaporator to evaporate and absorb heat to output cold energy to the cooling water, achieving the purpose of refrigeration. The steam enters the absorber to exchange heat with the cooling water and condenses, and then is transported to the generator to form a cycle.

[0006] The seawater flash evaporation desalination system is a treatment system that quickly obtains fresh water by desalination of seawater through flash evaporation technology. The principle is that by heating seawater, the boiling point of seawater decreases due to the decrease in pressure when seawater enters a low-pressure container, part of the sensible heat in the liquid is converted into latent heat, forming a gas-liquid coexistence state, so that part of the liquid rapidly vaporizes into saturated steam, thereby collecting fresh water. SUMMARY

[0007] The present application provides a multi-generation system and method integrating hydrogen production, power generation, refrigeration and seawater flash evaporation, which realizes the multi-generation combination of hydrogen production, power generation, refrigeration and seawater desalination, and improves the utilization rate of renewable energy power generation.

[0008] The technical scheme adopted by the present application to solve its technical problems is to provide a multi-generation system integrating hydrogen production, power generation, refrigeration and seawater flash evaporation, comprising: an electrolysis system, the electrolysis system comprising a proton exchange membrane electrolysis cell, electrodes of the proton exchange membrane electrolysis cell being electrically connected with a renewable energy power generation system and electrolyzing water to produce hydrogen by using electric power of the renewable energy power generation system; a hydrogen gas turbine cycle power generation system, the hydrogen gas turbine cycle power generation system comprising a combustion chamber, at least one turbine and a generator, an air inlet of the combustion chamber being connected with the electrolysis system, an air inlet of the at least one turbine being connected with an air outlet of the combustion chamber, hydrogen produced by electrolysis of the electrolysis system being combusted in the combustion chamber to produce steam, the steam driving the turbine to drive the generator to generate power, and exhaust steam at the end of the turbine being returned to the combustion chamber through a backwater pipeline after condensation; a refrigeration system, the refrigeration system comprising a generator, an air inlet of the generator being connected with the hydrogen gas turbine cycle power generation system and heat exchange between steam of the hydrogen gas turbine cycle power generation system and a refrigerant being performed; and a seawater flash evaporation desalination system, the seawater flash evaporation desalination system comprising a flash evaporation device and a No. 3 heat exchanger, the No. 3 heat exchanger being arranged in a seawater pipeline, an air inlet of the No. 3 heat exchanger being connected with an air outlet of the generator, and an air outlet of the No. 3 heat exchanger being connected with the backwater pipeline.

[0009] In another embodiment of the present application, the multi-generation system integrating hydrogen production, power generation, refrigeration and seawater flash evaporation further comprises a heat energy recovery system, the heat energy recovery system performing heat exchange between heat of outlet water of the proton exchange membrane electrolysis cell and backwater of the backwater pipeline through a heat exchange system.

[0010] In another embodiment of the present application, the heat energy recovery system comprises a No. 1 heat exchanger and a No. 2 heat exchanger which are connected in series to form a circulation loop, the No. 1 heat exchanger being connected in series with the proton exchange membrane electrolysis cell and outlet water in the proton exchange membrane electrolysis cell being able to enter the No. 1 heat exchanger to perform heat exchange, and the No. 2 heat exchanger being arranged in the backwater pipeline and backwater in the backwater pipeline being able to enter the No. 2 heat exchanger to perform heat exchange.

[0011] In another embodiment of the present application, a cold water tank and a hot water tank are further arranged in the circulation loop between the No. 1 heat exchanger and the No. 2 heat exchanger.

[0012] In another embodiment of the present application, a hydrogen storage tank is arranged in a hydrogen conveying pipeline between the proton exchange membrane electrolysis cell and the combustion chamber, and an oxygen storage tank is arranged in an oxygen conveying pipeline between the proton exchange membrane electrolysis cell and the combustion chamber.

[0013] In another embodiment of the present application, the hydrogen gas turbine cycle power generation system further comprises a No. 1 compressor, a No. 2 compressor, a condenser and a water pump, the gas turbine, the steam turbine and the generator are coaxially connected, the gas inlet of the gas turbine is connected with the gas outlet of the combustion chamber, the gas outlet of the gas turbine is connected with the gas inlet of the steam turbine and the gas inlet of the generator respectively, the end steam outlet of the steam turbine is connected with the gas inlet of the condenser, the water outlet of the condenser is connected with the backwater pipeline, and the water pump is arranged in the backwater pipeline.

[0014] In another embodiment of the present application, the refrigeration system is an absorption refrigerator, and the absorption refrigerator is internally provided with a generator, a condenser, an evaporator and an absorber, which are sequentially connected in series to form a refrigerant circulation loop.

[0015] In another embodiment of the present application, the seawater flash distillation system comprises at least two stages of flash distillation devices, and each stage of flash distillation device is connected with the No. 3 heat exchanger through a seawater pipeline in series.

[0016] Another technical solution adopted by the present application to solve its technical problems is to provide a poly-generation method, which adopts the integrated hydrogen production, power generation, refrigeration and seawater flash distillation poly-generation system of any one of the above embodiments, and comprises the following steps: determining whether the renewable energy power generation system has excess power, when the renewable energy power generation system has excess power, controlling the circuit between the renewable energy power generation system and the proton exchange membrane electrolysis cell electrode to be conductive, and electrolyzing water to produce hydrogen by using the power of the renewable energy power generation system; delivering the hydrogen generated by the electrolysis system to the combustion chamber of the hydrogen gas turbine cycle power generation system to produce steam by combustion, and then delivering the steam to the gas turbine and the steam turbine to generate power; delivering part of the steam of the hydrogen gas turbine cycle power generation system to the generator of the refrigeration system to exchange heat with the refrigerant; delivering the steam after heat exchange in the generator to the No. 3 heat exchanger of the seawater flash distillation system to exchange heat with seawater.

[0017] In another embodiment of the present application, the heat of the outlet water of the proton exchange membrane electrolysis cell is used to heat the backwater in the backwater pipeline by heat exchange. Advantages

[0018] Firstly, the present application combines the electrolysis system with the renewable energy power generation system, electrolyzes water to produce hydrogen by using the proton exchange membrane electrolysis cell, consumes power, utilizes the excess power of the renewable energy power generation system which cannot be consumed, and produces high-purity hydrogen which can be further utilized, thereby solving the problem of "abandoned wind and electricity" of the existing renewable energy power generation system due to the inability to consume power.

[0019] Secondly, this invention further integrates a hydrogen gas turbine cycle power generation system, a refrigeration system, and a seawater flash desalination system. Hydrogen and oxygen produced by the electrolysis of water in the electrolysis system are burned to generate high-temperature, high-pressure steam. This steam drives a turbine to power a generator. A portion of the steam from the hydrogen gas turbine cycle power generation system is sent to the generator in the refrigeration system to exchange heat with the refrigerant, thus starting the refrigeration system. The steam after heat exchange is further sent to the seawater flash desalination system to exchange heat with seawater, thereby raising the seawater temperature. This invention, starting with the utilization of electricity that renewable energy power generation systems cannot absorb, achieves multi-product integration of hydrogen production, power generation, refrigeration, and seawater desalination, effectively improving the utilization rate of renewable energy power generation.

[0020] Third, this invention constructs a dual-circulation reflux channel for the steam generated by hydrogen combustion in the combustion chamber. Firstly, a terminal exhaust steam condensation reflux channel is constructed within the hydrogen gas turbine cycle power generation system. Secondly, a heat exchange steam reflux channel is constructed between the hydrogen gas turbine cycle power generation system, the refrigeration system, and the seawater flash desalination system. By constructing these reflux channels, the steam generated in the combustion chamber can be comprehensively utilized, enabling the output of electricity, cooling, and fresh water, thereby improving the utilization rate of renewable energy power generation.

[0021] Fourth, some embodiments of the present invention also include a heat recovery system, which can further reuse the heat of the outlet water of the proton exchange membrane electrolyzer through heat exchange to heat the return water in the return water pipeline, thereby further improving the utilization rate of renewable energy power generation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the process of the multi-generation system integrating hydrogen production, power generation, refrigeration and seawater flash evaporation of the present invention. Appendix Figure 1 illustrate: Pipeline marked ① in the electrolysis system is connected to pipeline marked ① in the hydrogen gas turbine cycle power generation system; Pipeline labeled ② in the electrolysis system is connected to pipeline labeled ② in the hydrogen gas turbine cycle power generation system; Pipeline marked ③ in the hydrogen gas turbine cycle power generation system is connected to pipeline marked ③ in the refrigeration system; Pipeline ④ in the refrigeration system is connected to pipe ④ in the seawater flash desalination system; Pipeline number ⑤ in the seawater flash desalination system is connected to pipeline number ⑤ in the hydrogen gas turbine cycle power generation system. Detailed Implementation

[0024] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0025] like Figure 1 The diagram shows a combined hydrogen production, power generation, refrigeration, and seawater flash desalination system, which includes an electrolysis system, a hydrogen gas turbine cycle power generation system, a refrigeration system, a seawater flash desalination system, and a heat recovery system.

[0026] In this embodiment, the electrolysis system includes a proton exchange membrane electrolyzer, a hydrogen storage tank, and an oxygen storage tank. The cathode outlet of the proton exchange membrane electrolyzer is connected to the hydrogen storage tank via a pipeline, and the anode outlet of the proton exchange membrane electrolyzer is connected to the oxygen storage tank via a pipeline. The electrodes of the proton exchange membrane electrolyzer are connected to a renewable energy power generation system via a controllable circuit. When the control circuit is active, the electricity generated by the renewable energy power generation system can be used to electrolyze water to produce hydrogen and oxygen, which are then transported to the hydrogen and oxygen storage tanks for storage.

[0027] In this embodiment, the hydrogen gas turbine cycle power generation system includes a No. 1 compressor, a No. 2 compressor, a combustion chamber, a gas turbine, a steam turbine, a generator, a condenser, and a water pump. The gas turbine, steam turbine, and generator are coaxially connected, and the generator generates electricity by being driven by the gas turbine and steam turbine. The inlet of the No. 1 compressor is connected to the outlet of the hydrogen storage tank via a pipeline, and the outlet of the No. 1 compressor is connected to the inlet of the combustion chamber via a pipeline. The inlet of the No. 2 compressor is connected to the outlet of the oxygen storage tank via a pipeline, and the outlet of the No. 2 compressor is connected to the inlet of the combustion chamber via a pipeline. The steam outlet of the combustion chamber is connected to the steam inlet of the gas turbine via a pipeline, and the steam outlet of the gas turbine is connected to the steam inlet of the steam turbine via a pipeline. The exhaust port of the steam turbine is connected to the steam inlet of the condenser via a pipeline, and the water outlet of the condenser is connected to the combustion chamber via a return water pipeline. A water pump and a No. 2 heat exchanger are sequentially installed in the return water pipeline. Hydrogen and oxygen stored in hydrogen and oxygen storage tanks are transported to the combustion chamber for combustion to produce high-temperature, high-pressure steam. This steam is then transported to a gas turbine to perform work. A portion of the steam after work is then transported to a steam turbine to continue performing work, thereby driving a generator to produce electricity. The exhaust steam from the steam turbine enters a condenser, where it is condensed into condensate. This condensate then enters the return water pipeline and is pumped to heat exchanger No. 2 for heat exchange before being supplied to the combustion chamber. The water entering the combustion chamber absorbs the heat released from the combustion of hydrogen and oxygen. It should be noted that "exhaust steam from the steam turbine" does not refer to a specific location, but rather to the steam discharged from the steam turbine that undergoes subsequent condensation.

[0028] In this embodiment, a heat energy recovery system is provided between the electrolysis system and the hydrogen gas turbine cycle power generation system. The heat energy recovery system comprises a No. 1 heat exchanger, a No. 2 heat exchanger, a hot water tank and a cold water tank. The No. 1 heat exchanger and the No. 2 heat exchanger are connected in series through a pipeline to form a circulation loop, in which the No. 2 heat exchanger is provided with the cold water tank on the feed water side pipeline of the No. 1 heat exchanger, and the No. 1 heat exchanger is provided with the hot water tank on the feed water side pipeline of the No. 2 heat exchanger. The No. 1 heat exchanger is connected in series with the proton exchange membrane electrolysis cell circulation, so that the outlet water in the proton exchange membrane electrolysis cell can enter the No. 1 heat exchanger for heat exchange. The hot water after heat exchange in the No. 1 heat exchanger in the circulation loop enters the hot water tank for storage. The No. 2 heat exchanger is arranged in the backwater pipeline of the gas turbine cycle power generation system, so that the backwater in the backwater pipeline can enter the No. 2 heat exchanger for heat exchange. The cold water after heat exchange in the No. 2 heat exchanger in the circulation loop enters the cold water tank for storage.

[0029] In this embodiment, the refrigeration system is an absorption refrigerator, and the absorption refrigerator is internally provided with a generator, a condenser, an evaporator and an absorber. The generator, the condenser, the evaporator and the absorber are connected in series to form a refrigerant circulation loop. The steam inlet of the generator is connected with the steam outlet of the gas turbine through a pipeline, and part of the steam of the gas turbine is delivered to the generator to exchange heat with the refrigerant in the generator to evaporate the refrigerant to start refrigeration. After the refrigerant is evaporated, it enters the condenser to exchange heat with cooling water to condense, then enters the evaporator to output cold energy to the cooling water through evaporation heat absorption, so as to achieve the purpose of refrigeration. The steam enters the absorber to exchange heat with the cooling water to condense, and then is delivered to the generator to form a circulation.

[0030] In this embodiment, the seawater flash distillation system comprises a four-stage flash device and a No. 3 heat exchanger. The steam inlet of the No. 3 heat exchanger is connected with the steam outlet of the generator of the refrigeration system through a pipeline, and the steam outlet of the No. 3 heat exchanger is connected with the backwater pipeline of the hydrogen gas turbine cycle power generation system through a pipeline. The seawater is delivered into the 4th stage flash device, the 3rd stage flash device, the 2nd stage flash device and the 1st stage flash device in sequence through a pipeline, then enters the No. 3 heat exchanger to exchange heat with the steam to increase the temperature, and then enters the 1st stage flash device, the 2nd stage flash device, the 3rd stage flash device and the 4th stage flash device in sequence to flash and collect the distilled water.

[0031] The integrated hydrogen production, power generation, refrigeration and seawater flash distillation multi-generation system in application comprises the following steps: It is judged whether there is excess power in the renewable energy power generation system. The "excess power" should be understood as the power that cannot be consumed by the renewable energy power generation system within a certain period (such as one day). When there is excess power, the circuit between the renewable energy power generation system and the proton exchange membrane electrolysis cell electrode is turned on, and the water is electrolyzed by the power of the renewable energy power generation system to obtain hydrogen and oxygen, which are respectively stored in the hydrogen storage tank and the oxygen storage tank; The hydrogen and oxygen stored in the hydrogen storage tank and the oxygen storage tank are respectively transported to the combustion chamber of the hydrogen gas turbine cycle power generation system to be combusted, and the high-temperature and high-pressure steam is generated by heat exchange with the feed water of the combustion chamber, and then the steam is transported to the gas turbine to do work, and part of the steam after work is continuously transported to the steam turbine to do work to drive the generator to generate electricity.

[0032] Part of the steam output by the gas turbine is transported to the generator of the refrigeration system to exchange heat with the refrigerant to start the refrigeration system. The steam after heat exchange in the generator is transported to the No. 3 heat exchanger of the seawater flash distillation system to exchange heat with seawater, so that the seawater is heated to meet the sensible heat requirement of flash distillation. The condensate water of the steam turbine end exhaust and the reflux steam of the seawater flash distillation system are mixed in the backwater pipeline of the hydrogen gas turbine cycle power generation system and backflow to the combustion chamber to supply water to the combustion chamber, and the heat of the outlet water of the proton exchange membrane electrolysis cell is exchanged to the backwater in the backwater pipeline through the heat energy recovery system to increase the water temperature of the combustion chamber.

[0033] In this embodiment, the electrolysis system is combined with the renewable energy power generation system, and the hydrogen is produced by electrolysis of water in the proton exchange membrane electrolysis cell to consume electricity, and the excess electricity that cannot be consumed by the renewable energy power generation system is utilized to produce high-purity hydrogen which can be further utilized, so that the problem of “abandoning wind and electricity” due to the inability to consume electricity in the existing renewable energy power generation system is solved.

[0034] In this embodiment, the hydrogen gas turbine cycle power generation system, the refrigeration system and the seawater flash distillation system are further combined, the hydrogen and oxygen produced by electrolysis of water in the electrolysis system are combusted to generate high-temperature and high-pressure steam, the steam is used to drive the turbine to drive the generator to generate electricity, part of the steam of the hydrogen gas turbine cycle power generation system is transported to the generator of the refrigeration system to exchange heat with the refrigerant to start the refrigeration system, and the steam after heat exchange is further transported to the seawater flash distillation system to exchange heat with seawater to heat the seawater. The present application takes the utilization of electricity that cannot be consumed by the renewable energy power generation system as the starting point, realizes the multiple production combination of hydrogen production, power generation, refrigeration and seawater desalination, and effectively improves the utilization rate of renewable energy power generation.

[0035] In this embodiment, a double-cycle backflow channel is constructed for the steam generated by combustion of hydrogen in the combustion chamber, one is an end exhaust condensation cycle backflow channel constructed in the hydrogen gas turbine cycle power generation system, and the other is a heat exchange steam cycle backflow channel constructed between the hydrogen gas turbine cycle power generation system, the refrigeration system and the seawater flash distillation system. By constructing the above-mentioned cycle backflow channel, the comprehensive utilization of the steam generated by the combustion chamber is realized, and the electricity, cold energy and fresh water can be output, and the utilization rate of renewable energy power generation is improved.

[0036] The embodiment further combines a heat energy recovery system, which can further reuse the outlet water heat of the proton exchange membrane electrolysis cell through heat exchange, and is used for heating the return water in the return water pipeline, and further improves the utilization rate of renewable energy power generation.

Claims

1. A combined heat and power (CHP) system integrating hydrogen production, power generation, refrigeration, and seawater flash evaporation, characterized in that, include: An electrolysis system, comprising a proton exchange membrane electrolyzer, wherein the electrodes of the proton exchange membrane electrolyzer are electrically connected to a renewable energy power generation system and utilize the electricity generated by the renewable energy power generation system to electrolyze water to produce hydrogen; A hydrogen gas turbine cycle power generation system includes a combustion chamber, at least one turbine, and a generator. The inlet of the combustion chamber is connected to an electrolysis system, and the steam inlet of the at least one turbine is connected to the steam outlet of the combustion chamber. The steam generated by the combustion of hydrogen produced by electrolysis in the electrolysis system drives the turbine and thus drives the generator to generate electricity. The exhaust steam from the turbine is condensed and then returned to the combustion chamber through a return water pipeline. A refrigeration system, comprising a generator, the generator's inlet being connected to a hydrogen gas turbine cycle power generation system and utilizing the steam from the hydrogen gas turbine cycle power generation system for heat exchange with the refrigerant; and, A seawater flash desalination system, comprising a flash evaporation device and a No. 3 heat exchanger, wherein the No. 3 heat exchanger is installed in the seawater pipeline, the steam inlet of the No. 3 heat exchanger is connected to the steam outlet of the generator, and the steam outlet of the No. 3 heat exchanger is connected to the return water pipeline.

2. The integrated hydrogen production, power generation, refrigeration, and seawater flash evaporation multi-generation system according to claim 1, characterized in that: It also includes a heat recovery system, which transfers the heat from the outlet water of the proton exchange membrane electrolyzer to the return water in the return water pipeline via a heat exchange system.

3. The integrated hydrogen production, power generation, refrigeration, and seawater flash evaporation multi-generation system according to claim 2, characterized in that: The heat recovery system includes a No. 1 heat exchanger and a No. 2 heat exchanger connected in series to form a circulation loop. The No. 1 heat exchanger is connected in series with a proton exchange membrane electrolyzer, and the outlet water in the proton exchange membrane electrolyzer can enter the No. 1 heat exchanger for heat exchange. The No. 2 heat exchanger is located in the return water pipeline, and the return water in the return water pipeline can enter the No. 2 heat exchanger for heat exchange.

4. The integrated hydrogen production, power generation, refrigeration, and seawater flash evaporation multi-generation system according to claim 3, characterized in that: The circulation loop between heat exchanger No. 1 and heat exchanger No. 2 is also equipped with a cold water tank and a hot water tank.

5. A combined heat and power (CHP) system integrating hydrogen production, power generation, refrigeration, and seawater flash evaporation according to any one of claims 1-4, characterized in that: A hydrogen storage tank is provided in the hydrogen delivery pipeline between the proton exchange membrane electrolyzer and the combustion chamber, and an oxygen storage tank is provided in the oxygen delivery pipeline between the proton exchange membrane electrolyzer and the combustion chamber.

6. A combined heat and power (CHP) system integrating hydrogen production, power generation, refrigeration, and seawater flash evaporation according to any one of claims 1-4, characterized in that: The hydrogen gas turbine cycle power generation system also includes a No. 1 compressor, a No. 2 compressor, a condenser, and a water pump. The gas turbine, steam turbine, and generator are coaxially connected. The steam inlet of the gas turbine is connected to the steam outlet of the combustion chamber. The steam outlet of the gas turbine is connected to the steam inlet of the steam turbine and the steam inlet of the generator, respectively. The exhaust port of the steam turbine is connected to the steam inlet of the condenser. The water outlet of the condenser is connected to the return water pipeline. The water pump is installed in the return water pipeline.

7. A combined heat and power (CHP) system integrating hydrogen production, power generation, refrigeration, and seawater flash evaporation according to any one of claims 1-4, characterized in that: The refrigeration system is an absorption chiller, which contains a generator, a condenser, an evaporator, and an absorber, which are connected in series to form a refrigerant circulation loop.

8. A combined heat and power (CHP) system integrating hydrogen production, power generation, refrigeration, and seawater flash evaporation according to any one of claims 1-4, characterized in that: The seawater flash desalination system includes at least two flash evaporation units, and each flash evaporation unit is connected in series with heat exchanger No. 3 via seawater pipelines.

9. A method for combined heat and power generation, employing the integrated hydrogen production, power generation, refrigeration, and seawater flash evaporation system as described in any one of claims 1-8, characterized in that, Includes the following steps: Determine whether there is excess power in the renewable energy power generation system. If there is excess power, control the circuit between the renewable energy power generation system and the proton exchange membrane electrolyzer electrode to conduct and use the electricity from the renewable energy power generation system to electrolyze water to produce hydrogen. The hydrogen produced by the electrolysis system is transported to the combustion chamber of the hydrogen gas turbine cycle power generation system for combustion to generate steam, and then the steam is transported to the turbine to drive the turbine and thus drive the generator to generate electricity. A portion of the steam from the hydrogen gas turbine cycle power generation system is transported to the generator of the refrigeration system to exchange heat with the refrigerant; The steam obtained after heat exchange in the generator is then transported to heat exchanger No. 3 of the seawater flash desalination system to exchange heat with seawater.

10. A method for polygeneration according to claim 9, characterized in that: The heat from the outlet water of the proton exchange membrane electrolyzer is used to heat the return water in the return water pipeline through heat exchange.

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