Proton exchange membrane fuel cell combined cooling heating and power system

Abstract

The application discloses a combined cooling, heating and power system of a proton exchange membrane fuel cell, which comprises a hydrogen storage tank connected with a proton exchange membrane fuel cell stack through a hydrogen inlet pipeline, an air inlet pipeline arranged at a cathode inlet of the proton exchange membrane fuel cell stack, an output end of the proton exchange membrane fuel cell connected with a DC / DC converter, a cooling water circulation outlet of the proton exchange membrane fuel cell stack connected with a first three-way valve through a pipeline, the first three-way valve connected with an absorption heat pump system and an organic Rankine cycle system through pipelines respectively, and a cooling water circulation inlet of the proton exchange membrane fuel cell stack connected with a second three-way valve through a pipeline. The application realizes efficient utilization of waste heat of the proton exchange membrane fuel cell, realizes heat / cold supply and power generation by using the waste heat, realizes decoupling of power generation and heat / cold supply by flexibly adjusting a waste heat distribution ratio, improves flexibility and efficiency of waste heat utilization, and improves comprehensive energy utilization efficiency.

Description

Technical Field

[0001] This invention belongs to the field of waste heat recovery of fuel cells, and more specifically relates to waste heat recovery of proton exchange membrane fuel cells and combined cooling, heating and power systems. Background Technology

[0002] Fuel cells are efficient and clean hydrogen energy utilization devices, and waste heat recovery from fuel cells is crucial for improving overall energy efficiency. Proton exchange membrane fuel cells (PEMFCs) offer a range of advantages, including low operating noise, high power density, and high energy conversion efficiency, making them an important method for energy conservation and carbon reduction. Traditional fuel cell systems often fail to effectively utilize the heat generated during operation, with most of the heat energy dissipated as waste heat, leading to energy waste and a significant heat dissipation burden.

[0003] To achieve efficient overall system operation, recovering waste heat from fuel cells and utilizing it through reasonable heat source complementarity and cascade utilization are key issues in improving the overall performance of fuel cell systems. Fuel cell systems are widely used in stationary power supply systems, and there are currently many ways to utilize waste heat, such as waste heat-driven organic Rankine cycle power generation and waste heat cooling. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a proton exchange membrane fuel cell combined cooling, heating and power system that achieves efficient utilization of waste heat from the proton exchange membrane fuel cell, enabling the use of waste heat for heating / cooling and power generation. By flexibly adjusting the waste heat distribution ratio, the power generation and heating / cooling are decoupled, further improving the flexibility and efficiency of waste heat utilization, enhancing the overall energy utilization efficiency, increasing economic benefits, and reducing waste heat emissions.

[0005] The technical objective of this invention is achieved through the following technical solution.

[0006] The proton exchange membrane fuel cell combined cooling, heating and power system comprises the following structural components:

[0007] The hydrogen storage tank is connected to the proton exchange membrane fuel cell stack via a hydrogen inlet pipeline. A pressure reducing valve, a flow valve, a first heat exchanger, a first humidifier, and an ejector are sequentially installed in the hydrogen inlet pipeline between the hydrogen storage tank and the proton exchange membrane fuel cell stack.

[0008] An air intake pipe is provided at the cathode inlet of the proton exchange membrane fuel cell stack, and a filter, an air compressor, a second heat exchanger, and a second humidifier are sequentially installed in the air intake pipe; the cathode outlet of the proton exchange membrane fuel cell stack is connected to the first heat exchanger through a pipe, and a steam-water separator and a first valve are installed in the pipe.

[0009] The power output terminal of the proton exchange membrane fuel cell stack is connected to a DC / DC converter. The DC / DC converter is connected to a DC / AC converter and a lithium-ion battery. The DC / AC converter is connected to the lithium-ion battery and the indoor power supply terminal.

[0010] The cooling water circulation outlet of the proton exchange membrane fuel cell stack is connected to a first three-way valve via a pipeline, and a cooling water circulation pump is installed in the pipeline. The first three-way valve is then connected to an absorption heat pump system and an organic Rankine cycle system via pipelines. The cooling water circulation inlet of the proton exchange membrane fuel cell stack is connected to a second three-way valve via a pipeline, and the second three-way valve is then connected to an absorption heat pump system and an organic Rankine cycle system via pipelines.

[0011] In the above technical solution, a gas pipeline is provided between the anode outlet and the ejector inlet of the proton exchange membrane fuel cell stack.

[0012] In the above technical solution, the gas outlet of the steam-water separator is connected to the first heat exchanger, and the liquid outlet of the steam-water separator is connected to the first humidifier and the second humidifier through pipelines.

[0013] In the above technical solution, the first three-way valve is connected to the second evaporator through a pipeline, and the second three-way valve is connected to the second evaporator through a pipeline; the organic Rankine cycle system includes a second evaporator, which is connected to a steam turbine through a pipeline, the steam turbine is connected to a second condenser, the second condenser is connected to the evaporator through a pipeline and a second pump is installed in the pipeline, and the steam turbine is connected to the indoor power supply terminal.

[0014] In the above technical solution, a first three-way valve is connected to the generator via a pipeline, and a second three-way valve is also connected to the generator via a pipeline. The absorption heat pump system includes a generator connected to a first condenser via a pipeline. The first condenser is connected to an outdoor integrated cooling and heating unit via a pipeline and a second valve is installed on the pipeline. The first condenser is connected to an indoor heating terminal via a pipeline and a ninth valve is installed on the pipeline. The first condenser is connected to a first evaporator via a pipeline and a first expansion valve is installed on the pipeline. The outlet of the first evaporator is connected to the inlet of the outdoor integrated cooling and heating unit via a pipeline and a third valve. A branch line is also connected to the indoor cooling terminal via the pipeline. A seventh valve is installed on the top; the outlet of the outdoor integrated cooling and heating unit is connected to the inlet of the first evaporator through a pipeline and a fifth valve, and is connected to the indoor cooling terminal through a branch line on the pipeline, with an eighth valve installed on the branch line; the outdoor integrated cooling and heating unit is connected to the absorber through a pipeline and a fourth valve is installed on the pipeline; the indoor heating terminal is connected to the absorber through a pipeline and a sixth valve is installed on the pipeline; the first evaporator is connected to the absorber; the absorber is connected to the first condenser through a pipeline; the absorber is connected to the intermediate heat exchanger through two pipelines, with a second expansion valve and a first pump installed on each of the two pipelines; the intermediate heat exchanger is connected to the generator through two pipelines.

[0015] In the above technical solution, the working fluid of the organic Rankine cycle system is R245a.

[0016] In the above technical solution, the cooling medium is not lower than -20℃ and the heating medium is not higher than 60℃, both of which use ethylene glycol.

[0017] In the technical solution of this invention, when the temperature change range is 75℃-85℃, the heating COP and cooling COP of this system vary with the temperature. Studies have found that the cooling COP ranges from approximately 0.85 to 0.87, and the heating COP ranges from 1.7 to 1.85. The power generation efficiency of the organic Rankine cycle system is 0.09-0.12. In practical applications, the absorption temperature, condensation temperature, and evaporation temperature of the system need to be adjusted according to the current environmental conditions and the system's operating mode. The operating conditions are adjusted by regulating the pressure within the absorption heat pump system and the concentration of the lithium bromide solution. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the proton exchange membrane fuel cell combined cooling, heating and power system used in this invention. In the diagram, 1 is a hydrogen storage tank, 2 is a pressure reducing valve, 3 is a flow valve, 4 is a first heat exchanger, 5 is a first humidifier (i.e., an anode humidifier), 6 is an ejector, 7 is a proton exchange membrane fuel cell stack, 8 is a first valve, 9 is a vapor-liquid separator, 10 is a generator, 11 is a first condenser, 12 is a second valve, 13 is an outdoor integrated cooling and heating unit, 14 is a third valve, 15 is a fourth valve, 16 is a fifth valve, 17 is a first evaporator, 18 is a first expansion valve, 19 is an intermediate heat exchanger, 20 is a first pump, and 21 is an absorber. 22 is the second expansion valve, 23 is the cooling water circulation pump, 24 is the second humidifier (i.e., the cathode humidifier), 25 is the second heat exchanger, 26 is the air compressor, 27 is the filter, 28 is the DC / DC converter, 29 is the lithium-ion battery, 30 is the DC / AC converter, 31 is the indoor power supply terminal, 32 is the indoor heating terminal, 33 is the indoor cooling terminal, 34 is the ninth valve, 35 is the sixth valve, 36 is the seventh valve, 37 is the eighth valve, 38 is the second evaporator, 39 is the steam turbine, 40 is the second condenser, 41 is the second pump (i.e., the water pump), 42 is the first three-way valve, and 43 is the second three-way valve.

[0019] Figure 2 This is a graph showing the relationship between the efficiency of the organic Rankine cycle and temperature in this invention.

[0020] Figure 3 The graph shows the heating COP trend of this system when the temperature range is 75℃-85℃, the evaporator temperature is 15℃, the condenser temperature is 52℃, and the absorber temperature is 30℃.

[0021] Figure 4 The graph shows the trend of the refrigeration COP of this system when the temperature change range is 75℃-85℃, the evaporator temperature is 3℃, the condenser temperature is 30℃, and the absorber temperature is 30℃. Detailed Implementation

[0022] The technical solution of the present invention will be described in detail below with reference to specific embodiments.

[0023] like Figure 1 As shown, the proton exchange membrane fuel cell combined cooling, heating and power system includes the following structural components:

[0024] The hydrogen storage tank is connected to the proton exchange membrane fuel cell stack via a hydrogen inlet pipeline to allow hydrogen to enter the stack. A pressure reducing valve, a flow valve, a first heat exchanger, a first humidifier, and an ejector are sequentially installed in the hydrogen inlet pipeline between the storage tank and the stack. Hydrogen from the storage tank passes through the pressure reducing valve and flow valve into the first heat exchanger, then into the first humidifier for humidification, and subsequently through the ejector into the proton exchange membrane fuel cell stack to participate in the chemical reaction. During continuous operation, a gas pipeline is installed between the anode outlet and the ejector inlet of the proton exchange membrane fuel cell stack to mix unreacted hydrogen with hydrogen supplied from the storage tank before allowing it to enter the stack together for chemical reaction.

[0025] An air intake pipe is installed at the cathode inlet of the proton exchange membrane fuel cell stack. A filter, an air compressor, a second heat exchanger, and a second humidifier are sequentially installed in the air intake pipe. The air first undergoes preliminary treatment by the filter to remove solid impurities. The treated air then enters the air compressor for pressurization. The pressurized air then passes through the second heat exchanger and the second humidifier before entering the proton exchange membrane fuel cell stack to participate in the chemical reaction. The cathode outlet of the proton exchange membrane fuel cell stack is connected to the first heat exchanger via a pipe. A gas-water separator and a first valve are installed in the pipeline. The gas outlet of the gas-water separator is connected to the first heat exchanger, and the liquid outlet of the gas-water separator is connected to the first humidifier and the second humidifier through the pipeline. The gas-water mixture at the cathode of the proton exchange membrane fuel cell stack enters the gas-water separator through the pipeline. The separated gas enters the first heat exchanger through the pipeline and uses its heat to preheat the hydrogen entering the anode (it is discharged after preheating). The separated water enters the first humidifier and the second humidifier through the pipeline to humidify the anode intake and cathode intake.

[0026] The power output terminal of the proton exchange membrane fuel cell stack is connected to a DC / DC converter, which is connected to a DC / AC converter and a lithium-ion battery. The DC / AC converter is also connected to the lithium-ion battery and the indoor power supply terminal. Here, the electrical energy generated by the reaction of the proton exchange membrane fuel cell stack is converted by the DC / DC converter and the DC / AC converter and then supplied to the indoor power supply terminal. Alternatively, after passing through the DC / DC converter, it can be temporarily stored inside the lithium-ion battery. When the user's power demand increases, the lithium-ion battery discharges and supplies the power to the indoor power supply terminal through the DC / AC converter.

[0027] Chemical reactions occur within the proton exchange membrane fuel cell stack, generating significant waste heat while outputting electrical energy. This waste heat is removed from the stack via a cooling water circulation system. The cooling water circulation outlet of the proton exchange membrane fuel cell stack is connected to a first three-way valve via a pipeline, and a cooling water circulation pump is installed in this pipeline. The first three-way valve is then connected to the second evaporator and generator via pipelines. Heat is then transferred through the first three-way valve to the organic Rankine cycle system and the absorption heat pump system, respectively, according to user needs. The cooling water circulation inlet of the proton exchange membrane fuel cell stack is connected to a second three-way valve via a pipeline, and the second evaporator and generator are also connected to the second three-way valve via pipelines.

[0028] The second evaporator is connected to the steam turbine via pipelines. The steam turbine is connected to the second condenser, which is also connected to the evaporator via pipelines and has a second pump installed in the pipelines. The steam turbine is connected to the indoor power supply terminal, and heat is supplied to the organic Rankine cycle system to drive the second evaporator. The high-temperature steam generated from the second evaporator drives the steam turbine to do work, and supplies power to users through the indoor power supply terminal connected to it. After doing work, the high-temperature steam enters the second condenser for condensation, and then, via the water pump that acts as the second pump, pumps the condensed working fluid back to the second evaporator to complete the cycle.

[0029] The heat supply generator is used to drive the absorption heat pump system. The generator is connected to the first condenser via piping. The first condenser is connected to the outdoor integrated cooling and heating unit via piping, with a second valve installed on the piping. The first condenser is connected to the indoor heating terminal via piping, with a ninth valve installed on the piping. The first condenser is connected to the first evaporator via piping, with a first expansion valve installed on the piping. The outlet of the first evaporator is connected to the inlet of the outdoor integrated cooling and heating unit via piping and a third valve. A branch line on the pipe connects to the indoor cooling terminal, with a seventh valve installed on the branch line. The outlet of the outdoor integrated cooling and heating unit is connected to the inlet of the first evaporator via piping and a fifth valve. A branch line on the pipe connects to the indoor cooling terminal, with an eighth valve installed on the branch line. The outdoor integrated cooling and heating unit is connected to the absorber via piping, with a fourth valve installed on the piping. The indoor heating terminal is connected to the absorber via piping, with a sixth valve installed on the piping. The first evaporator is connected to the absorber. The absorber is connected to the first condenser via piping. The absorber is connected to the intermediate heat exchanger via two piping, with a second expansion valve and a first pump installed on each of the two piping. The intermediate heat exchanger is connected to the generator via two piping.

[0030] The system can adjust the ratio of heat entering the absorption heat pump system and the organic Rankine cycle through two three-way valves according to the user's electricity, heat and cooling needs, so as to achieve efficient and flexible energy supply for the entire system.

[0031] High-temperature cooling water flowing from the fuel cell system (i.e., the proton exchange membrane fuel cell stack) flows into the generator after passing through a cooling water circulation pump and a first three-way valve. Heat exchange occurs within the generator, and after the high-temperature cooling water temperature decreases, it flows back to the fuel cell stack through a second three-way valve and piping. After heat exchange with the high-temperature cooling water, some of the water in the lithium bromide aqueous solution inside the generator escapes as water vapor. This vapor enters the first condenser through piping, where it condenses and releases heat to become liquid water. The liquid water then passes through piping and a first expansion valve to reduce pressure before entering the first evaporator. Inside the first evaporator, the liquid water evaporates and absorbs heat, turning back into water vapor, which then enters the absorber through piping. After the water vapor escapes from the generator, the concentration of the lithium bromide aqueous solution increases, becoming a high-concentration lithium bromide aqueous solution. The high-concentration lithium bromide aqueous solution enters the absorber after passing through pipelines, an intermediate heat exchanger, and a second expansion valve. Inside the absorber, the high-concentration lithium bromide aqueous solution absorbs water vapor from the first evaporator and becomes a low-concentration lithium bromide aqueous solution. The absorption process is exothermic. The low-concentration lithium bromide solution enters the generator through pipelines, a first pump, and an intermediate heat exchanger, completing the internal circulation of the absorption system. The low-concentration lithium bromide solution from the absorber and the high-concentration lithium bromide solution from the generator exchange heat in the intermediate heat exchanger.

[0032] In summer, users require cooling. The heat carried out by the cooling water circulation system is used to drive the absorption system to provide cooling for users. This system provides cooling by absorbing heat during the evaporation process of liquid water inside the first evaporator. Ethylene glycol from the indoor cooling terminal enters the first evaporator through the eighth valve and pipeline for heat exchange, and its temperature decreases. The cooled ethylene glycol then enters the indoor cooling terminal through the pipeline and the seventh valve to provide indoor cooling. After cooling, the heated ethylene glycol flows back into the first evaporator through the pipeline and the eighth valve to complete the cooling cycle.

[0033] At this time, the third and fifth valves are open, and the pipeline connecting the first evaporator to the outdoor integrated cooling and heating unit is disconnected. Ethylene glycol from the outdoor integrated cooling and heating unit enters the absorber for heat exchange through the fourth valve and connecting pipeline. After absorbing heat, it enters the first condenser for heat exchange through the pipeline, and then enters the outdoor integrated cooling and heating unit through the second valve and connecting pipeline. After the ethylene glycol cools down, it passes through the fourth valve and pipeline to complete the process of residual heat exiting outdoors. At this time, the second valve 12 and the fourth valve 15 are closed to connect the corresponding pipelines; the ninth valve 34 and the sixth valve 35 are open to disconnect the corresponding pipelines.

[0034] In winter heating mode, the heating mode is adjusted by regulating the concentration of lithium bromide solution inside the generator and absorber, as well as the pressure within the generator, first condenser, first evaporator, and absorber. In heating mode, valves nine and six are closed, allowing ethylene glycol solution from the indoor heating terminal to enter the absorber for heat exchange via valve six, then pass through the first condenser, valve nine, and related piping to reach the indoor heating terminal for heating. At this time, valves two and four are open, preventing heat from entering the outdoor heating and cooling unit. Valve three and five are closed, allowing ethylene glycol from the outdoor heating and cooling unit to enter the first evaporator via valve five and piping for heat exchange, then return to the outdoor heating and cooling unit via valve three and piping, completing the cycle.

[0035] When the waste heat is used to drive the organic Rankine cycle, the cooling water from the proton exchange membrane fuel cell stack passes through the cooling water circulation pump and the first three-way valve, and a portion of the cooling water enters the second evaporator through a pipeline. After heat exchange, it returns to the proton exchange membrane fuel cell stack through the pipeline and the second three-way valve.

[0036] The working fluid in the organic Rankine cycle system is R245a. In the second evaporator, the working fluid absorbs heat from the high-temperature cooling water, turning into high-temperature steam. This steam then enters the turbine through pipelines to drive the turbine and perform work. The high-temperature steam, after performing work, becomes low-temperature exhaust steam, which then enters the second condenser for condensation. The condensed working fluid is then pumped back into the second evaporator, completing the cycle. The efficiency of the entire organic Rankine cycle varies with temperature, as shown below. Figure 2 As shown.

[0037] The system can adjust the heat entering the organic Rankine cycle system and absorption heat pump system according to the user's cooling / heating / electricity needs through the first three-way valve and the second three-way valve, thereby achieving flexible energy supply; and can switch between different states by controlling the opening and closing status of each valve.

[0038] When the temperature range is 75℃-85℃, the evaporator temperature is 15℃, the condenser temperature is 52℃, and the absorber temperature is 30℃, the heating COP trend of this system is as follows: Figure 3 As shown; when the temperature change range is 75℃-85℃, the evaporator temperature is 3℃, the condenser temperature is 30℃, and the absorber temperature is 30℃, the refrigeration COP trend of this system is as follows. Figure 4 As shown.

[0039] The present invention has been described above by way of example. It should be noted that any simple modifications, alterations or other equivalent substitutions that can be made by those skilled in the art without creative effort without departing from the core of the present invention fall within the protection scope of the present invention.

Claims

1. A proton exchange membrane fuel cell combined cooling, heating and power system, characterized in that, It includes the following structural components: The hydrogen storage tank is connected to the proton exchange membrane fuel cell stack via a hydrogen inlet pipeline. A pressure reducing valve, a flow valve, a first heat exchanger, a first humidifier, and an ejector are sequentially installed in the hydrogen inlet pipeline between the hydrogen storage tank and the proton exchange membrane fuel cell stack. An air intake pipe is provided at the cathode inlet of the proton exchange membrane fuel cell stack, and a filter, an air compressor, a second heat exchanger, and a second humidifier are sequentially installed in the air intake pipe; the cathode outlet of the proton exchange membrane fuel cell stack is connected to the first heat exchanger through a pipe, and a steam-water separator and a first valve are installed in the pipe. The power output terminal of the proton exchange membrane fuel cell stack is connected to a DC / DC converter. The DC / DC converter is connected to a DC / AC converter and a lithium-ion battery. The DC / AC converter is connected to the lithium-ion battery and the indoor power supply terminal. The cooling water circulation outlet of the proton exchange membrane fuel cell stack is connected to a first three-way valve via a pipeline, and a cooling water circulation pump is installed in the pipeline. The first three-way valve is then connected to an absorption heat pump system and an organic Rankine cycle system via pipelines. The cooling water circulation inlet of the proton exchange membrane fuel cell stack is connected to a second three-way valve via a pipeline, and the second three-way valve is then connected to an absorption heat pump system and an organic Rankine cycle system via pipelines.

2. The proton exchange membrane fuel cell combined cooling, heating and power system according to claim 1, characterized in that, The first three-way valve is connected to the second evaporator through a pipeline, and the second three-way valve is connected to the second evaporator through a pipeline; the organic Rankine cycle system includes a second evaporator, which is connected to a steam turbine through a pipeline, the steam turbine is connected to a second condenser, the second condenser is connected to the evaporator through a pipeline and a second pump is installed in the pipeline, and the steam turbine is connected to the indoor power supply terminal.

3. The proton exchange membrane fuel cell combined cooling, heating and power system according to claim 1 or 2, characterized in that, The first three-way valve is connected to the generator via a pipeline, and the second three-way valve is also connected to the generator via a pipeline. The absorption heat pump system includes a generator connected to a first condenser via a pipeline. The first condenser is connected to an outdoor integrated cooling and heating unit via a pipeline and has a second valve installed on the pipeline. The first condenser is connected to an indoor heating terminal via a pipeline and has a ninth valve installed on the pipeline. The first condenser is connected to a first evaporator via a pipeline and has a first expansion valve installed on the pipeline. The outlet of the first evaporator is connected to the inlet of the outdoor integrated cooling and heating unit via a pipeline and a third valve. A branch line is also connected to the indoor cooling terminal via this branch line, and a seventh valve is installed on the branch line. Valves; the outlet of the outdoor integrated cooling and heating unit is connected to the inlet of the first evaporator through a pipeline and a fifth valve. A branch line is connected to the indoor cooling terminal on the pipeline, and an eighth valve is installed on the branch line. The outdoor integrated cooling and heating unit is connected to the absorber through a pipeline and a fourth valve is installed on the pipeline. The indoor heating terminal is connected to the absorber through a pipeline and a sixth valve is installed on the pipeline. The first evaporator is connected to the absorber. The absorber is connected to the first condenser through a pipeline. The absorber is connected to the intermediate heat exchanger through two pipelines, and a second expansion valve and a first pump are installed on each of the two pipelines. The intermediate heat exchanger is connected to the generator through two pipelines.

4. The proton exchange membrane fuel cell combined cooling, heating and power system according to claim 1 or 2, characterized in that, A gas pipeline is installed between the anode outlet and the ejector inlet of the proton exchange membrane fuel cell stack.

5. The proton exchange membrane fuel cell combined cooling, heating and power system according to claim 3, characterized in that, A gas pipeline is installed between the anode outlet and the ejector inlet of the proton exchange membrane fuel cell stack.

6. The proton exchange membrane fuel cell combined cooling, heating and power system according to claim 1 or 2, characterized in that, The gas outlet of the steam-water separator is connected to the first heat exchanger, and the liquid outlet of the steam-water separator is connected to the first humidifier and the second humidifier through pipelines.

7. The proton exchange membrane fuel cell combined cooling, heating and power system according to claim 3, characterized in that, The gas outlet of the steam-water separator is connected to the first heat exchanger, and the liquid outlet of the steam-water separator is connected to the first humidifier and the second humidifier through pipelines.

8. The proton exchange membrane fuel cell combined cooling, heating and power system according to claim 1 or 2, characterized in that, The working fluid of the organic Rankine cycle system is R245a, the cooling medium is not lower than -20℃, the heat transfer medium is not higher than 60℃, and both use ethylene glycol.

9. The method for operating a proton exchange membrane fuel cell combined cooling, heating and power system as described in any one of claims 1-8, characterized in that, Hydrogen gas in the hydrogen storage tank enters the first heat exchanger through the pressure reducing valve and flow valve in sequence, and then enters the first humidifier for humidification. Subsequently, it enters the proton exchange membrane fuel cell stack through the ejector to participate in the chemical reaction. The air undergoes preliminary treatment by a filter to remove solid impurities. The treated air then enters an air compressor for pressurization. After passing through a second heat exchanger and a second humidifier, the pressurized air enters the proton exchange membrane fuel cell stack to participate in chemical reactions. The electrical energy generated by the proton exchange membrane fuel cell stack reaction is converted by a DC / DC converter and a DC / AC converter and then supplied to the indoor power supply terminal. Alternatively, it can be temporarily stored inside the lithium-ion battery after passing through a DC / DC converter. When the user's power demand increases, the lithium-ion battery discharges and supplies the indoor power supply terminal through the DC / AC converter. Chemical reactions occur within the proton exchange membrane fuel cell stack, generating a large amount of waste heat while outputting electrical energy. The waste heat is removed from the stack through a cooling water circulation system, and the heat is then transferred to the organic Rankine cycle system and the absorption heat pump system respectively through the first three-way valve according to user needs. Heat is supplied to the organic Rankine cycle system to drive the second evaporator. The high-temperature steam generated from the second evaporator drives the turbine to do work, which supplies power to the user through the indoor power supply terminal connected to it. After doing work, the high-temperature steam enters the second condenser and is condensed. Then, the water pump, which acts as the second pump, pumps the condensed working fluid to the second evaporator to complete the cycle. The heat supply generator drives the absorption heat pump system. After heat exchange with high-temperature cooling water, some water in the lithium bromide aqueous solution inside the generator escapes as water vapor. This vapor enters the first condenser through pipes, where it condenses and releases heat to become liquid water. The liquid water then passes through pipes and the first expansion valve to reduce pressure before entering the first evaporator. Inside the first evaporator, the liquid water evaporates and absorbs heat, becoming water vapor again, which then enters the absorber through pipes. After the water vapor escapes from the generator, the concentration of the lithium bromide aqueous solution increases, becoming a high-concentration lithium bromide aqueous solution. This high-concentration solution passes through pipes, an intermediate heat exchanger, and a second expansion valve before entering the absorber. Inside the absorber, the high-concentration lithium bromide solution absorbs water vapor from the first evaporator, becoming a low-concentration lithium bromide aqueous solution. This absorption process releases heat. The low-concentration lithium bromide solution then passes through pipes, the first pump, and the intermediate heat exchanger before entering the generator, completing the internal circulation of the absorption system. The low-concentration lithium bromide solution from the absorber and the high-concentration lithium bromide solution from the generator exchange heat in the intermediate heat exchanger.

10. The operation method of the proton exchange membrane fuel cell combined cooling, heating and power system according to claim 9, characterized in that, In summer, users require cooling. The heat carried out by the cooling water circulation system drives the absorption system to provide cooling for users. Inside the first evaporator, the evaporation process of liquid water absorbs heat to provide cooling for users. Ethylene glycol from the indoor cooling terminal enters the first evaporator through the eighth valve and pipeline for heat exchange, lowering its temperature. The cooled ethylene glycol then enters the indoor cooling terminal through the pipeline and the seventh valve to provide indoor cooling. After cooling, the heated ethylene glycol flows back into the first evaporator through the pipeline and the eighth valve to complete the cooling cycle. At this time, the third valve and the... With valve five open, the pipe connecting the first evaporator to the outdoor integrated cooling and heating unit is disconnected. Ethylene glycol from the outdoor integrated cooling and heating unit enters the absorber for heat exchange through valve four and connecting pipe. After absorbing heat, it enters the first condenser for heat exchange through pipe, and then enters the outdoor integrated cooling and heating unit through valve two and connecting pipe. After the ethylene glycol cools down, it passes through valve four and connecting pipe to complete the process of exhausting heat outdoors. At this time, valves two and four are closed to connect the corresponding pipes. Valve nine and valve six are open to disconnect the corresponding pipes. In winter heating mode, the heating mode is adjusted by regulating the concentration of lithium bromide solution inside the generator and absorber, as well as the pressure within the generator, first condenser, first evaporator, and absorber. In heating mode, valves nine and six are closed, allowing ethylene glycol solution from the indoor heating terminal to enter the absorber for heat exchange via valve six, then pass through the first condenser, valve nine, and related piping to reach the indoor heating terminal for heating. At this time, valves two and four are open, preventing heat from entering the outdoor heating and cooling unit. Valve three and five are closed, allowing ethylene glycol from the outdoor heating and cooling unit to enter the first evaporator via valve five and piping for heat exchange, then return to the outdoor heating and cooling unit via valve three and piping, completing the cycle.

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