A combined heat and power system based on liquid cooling technology proton exchange membrane fuel cell and heat pump coupling

Abstract

This invention discloses a combined heat and power (CHP) system based on liquid cooling technology and coupled with a heat pump, belonging to the field of energy technology. The system includes a proton exchange membrane fuel cell power generation and cooling system, a heat pump system, and a hot water or steam system. This invention proposes a decoupling scheme that combines the proton exchange membrane fuel cell power generation and cooling system with the heat pump system. A novel submerged liquid cooling technology is used to efficiently remove and recover waste heat generated by the fuel cell stack reaction. The coolant absorbs the waste heat from the stack, generating return gas for the heat pump compressor. The high-temperature exhaust gas from the heat pump compressor is used to produce 75-85°C hot water or 0.5-1.0 MPa low-pressure steam. The hot water can be used for hot water supply or winter heating, and the steam can be used in the steam production process. The fuel cell stack cooling uses submerged liquid cooling technology, which improves cooling conditions, ensures long-term efficient and stable operation of the fuel cell, and maximizes the recovery of waste heat from the stack, achieving CHP and thus improving the overall system efficiency.

Description

Technical Field

[0001] This invention relates to the field of energy technology, and specifically to a cogeneration system based on liquid cooling technology, where a proton exchange membrane fuel cell is coupled with a heat pump. Background Technology

[0002] Although renewable energy sources such as wind and solar power are developing rapidly, their intermittent and fluctuating characteristics limit their large-scale application and make it difficult to support the stable operation of future power systems. How to effectively utilize renewable energy power generation technologies and reduce the use of fossil fuels has become an urgent problem to be solved.

[0003] Hydrogen possesses high energy density, storing a large amount of energy per unit volume, making it crucial for addressing the intermittency and uncertainty of renewable energy sources. In highly volatile renewable energy systems such as wind and solar power, hydrogen serves as a stable energy storage medium. Furthermore, hydrogen, as a clean and renewable energy source, has been widely adopted. Low-temperature proton exchange membrane fuel cells (PEMFCs) are ideal for converting hydrogen into electricity due to their high power density, long lifespan, and rapid dynamic response. However, the electrochemical conversion efficiency of fuel cell stacks is typically only around 50%, with the remaining hydrogen energy dissipated as heat, and the power consumption of auxiliary equipment further reducing system efficiency. Utilizing the waste heat generated by the fuel cell is key to improving energy efficiency. In addition, traditional fuel cell stack cooling technologies require complex cooling channel designs, with coolant transported through pipes and flowing between bipolar plates.

[0004] Heat pump systems, as highly efficient heat conversion devices, offer significant advantages. They can recover and enhance the waste heat from proton exchange membrane fuel cells, achieving heat transfer with a small amount of electricity, and can adjust the heating temperature to meet various needs. However, the high thermoelectric coupling strength and insufficient heat output of fuel cell systems limit their flexibility in applications such as high-temperature heating. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems by providing a cogeneration system based on liquid cooling technology and coupled with a heat pump. It proposes a thermoelectric decoupling scheme that combines the proton exchange membrane fuel cell power generation and cooling system with the heat pump system, effectively overcoming the limitations of fuel cell systems, improving economic efficiency and feasibility, and supporting the low-carbon transition of regional energy.

[0006] The technical solution of the present invention is as follows:

[0007] A combined heat and power (CHP) system based on liquid cooling technology and coupled with a heat pump includes a proton exchange membrane fuel cell power generation and cooling system, a heat pump system, a hot water system, and a steam system. The proton exchange membrane fuel cell power generation and cooling system includes a proton exchange membrane fuel cell stack. Air pressurized by an air compressor and humidified by an air humidifier enters the cathode side of the proton exchange membrane fuel cell stack; hydrogen gas depressurized by a pressure reducing valve and humidified by a hydrogen humidifier enters the anode side. Air and hydrogen undergo an electrochemical reaction within the proton exchange membrane fuel cell stack to generate electricity and waste heat. The proton exchange membrane fuel cell stack is housed in a sealed liquid-cooled cabinet and directly immersed in the working fluid. The liquid working fluid absorbs the waste heat from the electrochemical reaction and, as a vapor-liquid mixture, is transferred through pipelines to a gas-liquid separator. After separation, the liquid working fluid is pressurized by a liquid pump and returned to the liquid-cooled cabinet to complete the cycle.

[0008] A heat pump system includes a heat pump compressor, which is connected to a gas-liquid separator and a condenser. The condenser is connected to the gas-liquid separator through a liquid storage tank, forming a heat pump cycle.

[0009] The waste heat generated by the proton exchange membrane fuel cell power generation and cooling system is used to heat the hot water system or steam system through a heat pump system.

[0010] Furthermore, the heat pump system also includes an energy saver. The two inlets of the energy saver are connected to the outlet of the liquid storage tank through inlet pipes, and an expansion valve II is installed on one inlet pipe. The two outlets of the energy saver are connected to the heat pump compressor and the gas-liquid separator, respectively. Both inlet pipes are connected to the outlet of the liquid storage tank through electronic three-way valve I and electronic three-way valve III. One outlet pipe of the energy saver is connected to the gas-liquid separator through expansion valve III and electronic three-way valve II.

[0011] Furthermore, the steam system includes a steam-water separator, the inlet of which is connected to a condenser via an electronic three-way valve IV and a control valve IV, and the outlet of which is connected to the condenser via a control valve V and an electronic three-way valve VII; the steam-water separator is also connected to a steam compressor.

[0012] Furthermore, the hot water system includes a hot water storage tank, the inlet of which is connected to the condenser via electronic three-way valve IV and electronic three-way valve V, and the outlet of which is connected to the condenser via electronic three-way valve VI and electronic three-way valve VII.

[0013] Furthermore, the hot water storage tank is also connected to the user via electronic three-way valve V, control valve II, and electronic three-way valve VI, control valve III.

[0014] Furthermore, the outlet of the storage tank is connected to the gas-liquid separator via electronic three-way valve I, control valve I, expansion valve I, and electronic three-way valve II.

[0015] Furthermore, the working fluid is an organic refrigeration working fluid, including one or more combinations of propane, (iso)pentane, and CO2 natural working fluid.

[0016] Furthermore, the steam compressor is a screw-type steam compressor or a Roots-type compressor, which pressurizes the hot water in the steam-water separator to 0.5-1.0 MPa to generate steam for user use.

[0017] Furthermore, the hydrogen is supplied by a high-pressure hydrogen storage tank.

[0018] Furthermore, the heat pump compressor is a spiral type.

[0019] Compared with existing technologies, the advantages of this invention are:

[0020] 1. A cogeneration system based on liquid cooling technology for proton exchange membrane fuel cells coupled with a heat pump. This system proposes a decoupling scheme that combines the power generation and cooling system of the proton exchange membrane fuel cell with the heat pump system. A novel submerged liquid cooling technology is used to efficiently remove and recover waste heat generated by the fuel cell stack reaction. The coolant absorbs the waste heat from the stack, generating return gas for the heat pump compressor. The high-temperature exhaust gas from the heat pump compressor is used to produce 75-85℃ hot water or 0.5-1.0MPa low-pressure steam. The hot water can be used for hot water supply or winter heating, and the steam can be used in the steam production process. The fuel cell stack cooling adopts submerged liquid cooling technology, which improves the cooling conditions, ensures long-term efficient and stable operation of the fuel cell, and maximizes the recovery of waste heat from the stack, achieving cogeneration and thus improving the overall system efficiency.

[0021] 2. A cogeneration system based on liquid cooling technology, which couples a proton exchange membrane fuel cell with a heat pump, can effectively alleviate the inherent problems of strong thermoelectric coupling and poor cooling effect in fuel cell systems. It has high feasibility and application prospects, improves the energy utilization efficiency of the system, and helps to promote the transformation of regional energy structure towards low carbon. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the system structure of this application.

[0023] Figure 2 This is a schematic diagram of the novel immersion liquid cooling technology for proton exchange membrane fuel cell stacks proposed in this application.

[0024] Figure reference numerals: 1-Air, 2-Air compressor, 3-Air humidifier, 4-High-pressure hydrogen storage tank, 5-Gas pressure reducing valve, 6-Hydrogen humidifier, 7-Liquid cooling cabinet, 8-Working fluid, 9-Proton exchange membrane fuel cell, 10-Liquid pump, 11-Gas-liquid separator, 12-Heat pump compressor, 13-Condenser, 14-Liquid storage tank, 15-Electronic three-way valve I, 16-Control valve I, 17-Expansion valve I, 1 8-Electronic three-way valve II, 19-Electronic three-way valve III, 20-Expansion valve II, 21-Energy saver, 22-Expansion valve III, 23-Electronic three-way valve IV, 24-Electronic three-way valve V, 25-Hot water storage tank, 26-Electronic three-way valve VI, 27-Electronic three-way valve VII, 28-Control valve II, 29-Control valve III, 30-Control valve IV, 31-Control valve V, 32-Steam-water separator, 33-Steam compressor. Detailed Implementation

[0025] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0026] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0027] Please see Figure 1 and Figure 2A combined heat and power system based on liquid cooling technology and coupled with a heat pump includes a proton exchange membrane fuel cell power generation and cooling system, a heat pump system, a hot water system, and a steam system. The proton exchange membrane fuel cell power generation and cooling system includes a proton exchange membrane fuel cell stack 9. The cathode side of the proton exchange membrane fuel cell stack 9 is fed by air 1, which is pressurized by an air compressor 2 and humidified by an air humidifier 3. The anode side of the proton exchange membrane fuel cell stack 9 is fed by hydrogen, which is depressurized by a pressure reducing valve 5 and humidified by a hydrogen humidifier 6. The air 1 and hydrogen undergo an electrochemical reaction in the proton exchange membrane fuel cell stack 9 to generate electricity and waste heat. The proton exchange membrane fuel cell stack 9 is housed in a sealed liquid cooling cabinet 7 and is directly immersed in a working fluid 8. The liquid working fluid 8 absorbs the waste heat from the electrochemical reaction and, as a vapor-liquid mixture, is transferred through a pipeline to a gas-liquid separator 11. After separation, the liquid working fluid 8 is pressurized by a liquid pump 10 and returned to the liquid cooling cabinet 7 to complete the cycle.

[0028] The heat pump system includes a heat pump compressor 12, which is connected to a gas-liquid separator 11 and a condenser 13. The condenser 13 is connected to the gas-liquid separator 11 through a liquid storage tank 14 to form a heat pump cycle.

[0029] The waste heat generated by the proton exchange membrane fuel cell power generation and cooling system is used to heat the hot water system or steam system through a heat pump system.

[0030] The heat pump system also includes an energy saver 21. The two inlets of the energy saver 21 are connected to the outlet of the liquid storage tank 14 through inlet pipes. An expansion valve II 20 is installed on one inlet pipe. The two outlets of the energy saver 21 are connected to the heat pump compressor 12 and the gas-liquid separator 11, respectively. Both inlet pipes are connected to the outlet of the liquid storage tank 14 through electronic three-way valve I 15 and electronic three-way valve III 19. One outlet pipe of the energy saver 21 is connected to the gas-liquid separator 11 through expansion valve III 22 and electronic three-way valve II 18.

[0031] The steam system includes a steam-water separator 32. The inlet of the steam-water separator 32 is connected to the condenser 13 through an electronic three-way valve IV23 and a control valve IV30. The outlet of the steam-water separator 32 is connected to the condenser 13 through a control valve V31 and an electronic three-way valve VII27. The steam-water separator 32 is also connected to a steam compressor 33.

[0032] The hot water system includes a hot water storage tank 25. The inlet of the hot water storage tank 25 is connected to the condenser 13 through electronic three-way valves IV 23 and V 24. The outlet of the hot water storage tank 25 is connected to the condenser 13 through electronic three-way valves VI 26 and VII 27.

[0033] The hot water storage tank 25 is also connected to the user via electronic three-way valve V24, control valve II28, electronic three-way valve VI26, and control valve III29.

[0034] The outlet of the liquid storage tank 14 is connected to the gas-liquid separator 11 through electronic three-way valve I 15, control valve I 16, expansion valve I 17, and electronic three-way valve II 18.

[0035] Working fluid 8 is an organic refrigerant, including one of the following natural working fluids: propane, (iso)pentane, CO2, etc., or a binary (multi-component) mixture of these. It meets the requirements of an evaporation pressure slightly higher than atmospheric pressure, good circulation performance, no flammability or explosiveness, no corrosion to the fuel cell stack cooling channels, and is very environmentally friendly. When supplying steam, the steam-water separator for producing water vapor should be positioned higher than the condenser to ensure the natural circulation pressure differential required for siphon flow.

[0036] The steam compressor 33 is a screw-type steam compressor or a Roots-type compressor. The steam compressor 33 pressurizes the hot water in the steam-water separator 32 to 0.5-1.0 MPa to produce steam for users.

[0037] Hydrogen is supplied by high-pressure hydrogen storage tank 4.

[0038] The heat pump compressor 12 is a spiral type.

[0039] Working principle:

[0040] The proton exchange membrane fuel cell power generation cooling system is as follows: Air 1 from the environment enters air compressor 2, is pressurized to the working pressure of the proton exchange membrane fuel cell stack 9, and then enters air humidifier 3. After being humidified by air humidifier 3, it enters the cathode side of the fuel cell stack. Fresh hydrogen is supplied through high-pressure hydrogen storage tank 4. After the hydrogen enters pressure reducing valve 5 and is depressurized, it enters hydrogen humidifier 6. After being humidified by hydrogen humidifier 6, it enters the anode side of the fuel cell stack. The air and hydrogen in the proton exchange membrane fuel cell stack... After electrochemical reactions occur on the cathode and anode sides, electrical energy and waste heat are generated. The proton exchange membrane fuel cell stack 9 is installed in a sealed liquid-cooled cabinet 7. The working fluid 8 is directly immersed in the proton exchange membrane fuel cell stack 9, so that the waste heat generated by the electrochemical reaction can be directly transferred to the working fluid 8. The vapor-liquid mixture (generally with a vapor content of less than 30%) absorbed by the liquid working fluid is transferred to the gas-liquid separator 11 through a pipeline. Vapor-liquid separation is achieved in the gas-liquid separator 11. The liquid working fluid is pressurized by the liquid pump 10 and sent into the stack cooling channel to complete one cycle.

[0041] The novel submerged proton exchange membrane fuel cell liquid cooling technology is as follows: The proton exchange membrane fuel cell stack 9 is installed in a sealed liquid-cooled cabinet 7 and immersed in the working fluid 8. Because its evaporation pressure is slightly higher than atmospheric pressure, it has good circulation performance, is non-flammable and non-explosive, and does not corrode the stack cooling channels. A novel submerged cooling technology is adopted, which can efficiently absorb the heat generated by the stack by immersing the coolant in the proton exchange membrane fuel cell stack, thereby improving cooling efficiency and significantly enhancing the cooling effect. No additional energy consumption from the cooling circulating water pump is required, reducing energy loss. With the increasing demand for high-performance fuel cell design, this stack cooling technology provides the possibility of reducing volume and optimizing heat dissipation.

[0042] When supplying hot water at 75-85℃, the system operates as follows: Electronic three-way valves I15, II18, IV23, V24, VI26, and VII27, as well as control valves I16, II28, and III29 are opened respectively; simultaneously, electronic three-way valve III19, IV30, and V31 are closed. The ambient temperature heat pump working fluid from storage tank 14 flows sequentially through electronic three-way valve I15 and control valve I16 into expansion valve I17. After being throttled and depressurized by expansion valve I17, it reaches the desired cooling temperature. The cryogenic liquid, with an average temperature 5°C lower than the water inlet and outlet, enters the gas-liquid separator 11 through the electronic three-way valve 18. The liquid working fluid is pressurized by the liquid pump 10 and sent into the stack cooling channel. The liquid-liquid mixture (generally with a vapor content of less than 30%) after absorbing heat from the proton exchange membrane fuel cell stack 9 returns to the gas-liquid separator 11, where gas-liquid separation is achieved. The saturated gas working fluid is drawn into the heat pump compressor 12. The high-temperature and high-pressure exhaust gas from the compressor 12 then enters the condenser 13, which also serves as a hot water heater. The heat pump working fluid is condensed into liquid and flows into the storage tank 14, completing one heat pump cycle. Cold water from the hot water storage tank 25 passes through electronic three-way valves VI 26 and VII 27 into the hot water condenser 13 to absorb the condensation heat of the high-temperature exhaust gas. The cold water is heated to 75-85℃ and then sent to the user or the hot water storage tank 25 through electronic three-way valves IV 23 and V 24. The user's or the heat storage tank's needs are met by the flexible control of control valves II 28 and III 29.

[0043] When supplying low-pressure steam of 0.5-1.0 MPa, the system operates as follows: Electronic three-way valves I15, II18, III19, IV23, VII27, IV30, and V31 are opened respectively, while electronic three-way valves V24 and VI26 are closed simultaneously; the liquid working fluid from storage tank 14 is divided into two paths, one of which flows sequentially through electronic three-way valves I15 and III19 into the heat pump via expansion valve II20 for throttling and pressure reduction. The compressor's replenishment pressure, after throttling, produces a low-temperature liquid working fluid that enters the economizer 21. The low-temperature liquid absorbs heat from the working fluid in the coil and evaporates into saturated gas, which then enters the replenishment port of the screw heat pump compressor 12. Another path leads to the cooling coil of the economizer 21, where it is cooled by the low-temperature working fluid outside the coil, becoming a high-pressure recooled liquid. This recooled liquid is then throttled and depressurized by expansion valve III 22 to a low-temperature liquid of 5-10°C, and enters the gas-liquid separator 11 via electronic three-way valve II 18. The liquid working fluid in the storage tank 14 is pressurized by the liquid pump 10 and sent to... The liquid enters the cooling channel of the proton exchange membrane fuel cell stack 9. The vapor-liquid mixture (generally with a vapor content of less than 30%) after absorbing heat from the proton exchange membrane fuel cell stack 9 returns to the gas-liquid separator 11, where vapor-liquid separation is achieved. The saturated gaseous working fluid is drawn into the screw-type heat pump compressor 12 with a gas inlet. The high-temperature, high-pressure exhaust gas from the compressor 12 then enters the condenser 13, which also serves as a high-temperature hot water heater. The heat pump working fluid is condensed into a liquid and flows into the liquid storage tank 14, completing one heat pump cycle. From the gas-liquid separator 32... The incoming 105-110℃ saturated water flows into the condenser 13 through the downcomer, through the control valve V31 and the electronic three-way valve VII27, to absorb the condensation heat of the heat pump working fluid. Then, it flows through the riser through the electronic three-way valve IV23 and the control valve IV30 into the steam-water separator 32. The saturated steam generated by the hot water absorbing heat in the condenser 13 is separated in the steam-water separator 32 and pressurized to 0.5-1.0MPa by the screw steam compressor (or Roots compressor) 33 to produce steam, which is then supplied to the user.

[0044] The design of a thermoelectric decoupling scheme for proton exchange membrane fuel cell cogeneration combined with a heat pump system improves the overall system performance to a certain extent. The heat pump system, as a highly efficient heat transfer device, uses a heat pump circulating working fluid that meets the requirements of slightly higher evaporation pressure than atmospheric pressure, good circulation performance, no flammability or explosiveness, and no corrosion to the stack cooling channels. The waste heat generated by the fuel cell is efficiently removed and recovered, generating return gas to the heat pump compressor. The high-temperature exhaust gas from the heat pump compressor is used to produce 75-85℃ hot water or 0.5-1.0MPa low-pressure steam. The hot water can be used for hot water supply or winter heating, and the steam can be used in the steam production process, making full use of the waste heat of the fuel cell and realizing the cascade utilization of energy.

[0045] This invention addresses the inherent problem of strong thermoelectric coupling in traditional fuel cell cogeneration systems. By integrating a proton exchange membrane fuel cell system with a heat pump, it enhances thermoelectric regulation and heating capabilities, especially under high heating demands where fuel cell waste heat may be insufficient. This combination not only solves the strong coupling problem in fuel cells but also effectively adapts to different heat and electrical loads, making a significant contribution to the green and low-carbon transformation of regional energy systems.

[0046] The embodiments described above merely illustrate specific implementation methods of this application, and while the descriptions are detailed and specific, they should not be construed as limiting the scope of protection of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the technical solution of this application, and these modifications and improvements all fall within the scope of protection of this application.

Claims

1. A cogeneration system for proton exchange membrane fuel cells coupled with a heat pump based on liquid cooling technology, characterized in that, The system includes a proton exchange membrane fuel cell power generation cooling system, a heat pump system, a hot water system, and a steam system. The proton exchange membrane fuel cell power generation cooling system includes a proton exchange membrane fuel cell stack (9). The cathode side of the proton exchange membrane fuel cell stack (9) is supplied with air (1) that has been pressurized by an air compressor (2) and humidified by an air humidifier (3). The anode side of the proton exchange membrane fuel cell stack (9) is supplied with hydrogen that has been depressurized by a pressure reducing valve (5) and humidified by a hydrogen humidifier (6). Gas enters; air (1) and hydrogen undergo an electrochemical reaction in the proton exchange membrane fuel cell stack (9) to generate electrical energy and waste heat; the proton exchange membrane fuel cell stack (9) is set in a sealed liquid-cooled cabinet (7) and is directly immersed in the working fluid (8); the liquid working fluid (8) absorbs the waste heat of the electrochemical reaction and is transferred to the gas-liquid separator (11) through the pipeline after absorbing the waste heat of the electrochemical reaction. After separation, the liquid working fluid (8) is pressurized by the liquid pump (10) and returned to the liquid-cooled cabinet (7) to complete the cycle; The heat pump system includes a heat pump compressor (12), which is connected to a gas-liquid separator (11) and a condenser (13). The condenser (13) is connected to the gas-liquid separator (11) through a liquid storage tank (14) to form a heat pump cycle. The waste heat generated by the proton exchange membrane fuel cell power generation and cooling system is used to heat the hot water system or steam system through a heat pump system. The heat pump system also includes an energy saver (21). The two inlets of the energy saver (21) are connected to the outlet of the liquid storage tank (14) through inlet pipes. An expansion valve II (20) is installed on one inlet pipe. The two outlets of the energy saver (21) are connected to the heat pump compressor (12) and the gas-liquid separator (11) respectively. Both inlet pipes are connected to the outlet of the liquid storage tank (14) through electronic three-way valve I (15) and electronic three-way valve III (19). One outlet pipe of the energy saver (21) is connected to the gas-liquid separator (11) through expansion valve III (22) and electronic three-way valve II (18). The steam system includes a steam-water separator (32), the inlet of which is connected to a condenser (13) via an electronic three-way valve IV (23) and a control valve IV (30), and the outlet of which is connected to the condenser (13) via a control valve V (31) and an electronic three-way valve VII (27); the steam-water separator (32) is also connected to a steam compressor (33); The hot water system includes a hot water storage tank (25), the inlet of the hot water storage tank (25) is connected to the condenser (13) through electronic three-way valve IV (23) and electronic three-way valve V (24), and the outlet of the hot water storage tank (25) is connected to the condenser (13) through electronic three-way valve VI (26) and electronic three-way valve VII (27).

2. The cogeneration system of a proton exchange membrane fuel cell coupled with a heat pump based on liquid cooling technology according to claim 1, characterized in that, The hot water storage tank (25) is also connected to the user via electronic three-way valve V (24), control valve II (28), electronic three-way valve VI (26), and control valve III (29).

3. A cogeneration system based on liquid cooling technology and coupled with a heat pump, as described in claim 1, is characterized in that... The outlet of the storage tank (14) is connected to the gas-liquid separator (11) via electronic three-way valve I (15), control valve I (16), expansion valve I (17), and electronic three-way valve II (18).

4. A cogeneration system based on liquid cooling technology and coupled with a heat pump, as described in claim 1, is characterized in that... The working medium (8) is an organic refrigeration working medium, including one or more combinations of propane, (iso)pentane, and CO2 natural working medium.

5. A cogeneration system based on liquid cooling technology and coupled with a heat pump for a proton exchange membrane fuel cell, as described in claim 1, is characterized in that... The steam compressor (33) is a screw-type steam compressor or a Roots-type compressor. The steam compressor (33) pressurizes the hot water in the steam-water separator (32) to 0.5-1.0 MPa to generate steam for the user.

6. A cogeneration system based on liquid cooling technology and coupled with a heat pump for a proton exchange membrane fuel cell, as described in claim 1, is characterized in that... The hydrogen is supplied by a high-pressure hydrogen storage tank (4).

7. A cogeneration system based on liquid cooling technology and coupled with a heat pump for a proton exchange membrane fuel cell, as described in claim 1, is characterized in that... The heat pump compressor (12) is a spiral type.

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