Hydrogen production system

Abstract

The application relates to a hydrogen production system. The hydrogen production system comprises an electrolysis cell module and a steam heat pump module. The steam heat pump module comprises a heat pump assembly, a water storage tank and a flash tank. The heat pump assembly comprises a condenser. An outlet of the water storage tank is connected to a cold side inlet of the condenser. A cold side outlet of the condenser is connected to an inlet of the flash tank. An outlet of the flash tank is connected to an inlet of a fuel gas preheater. The steam heat pump module of the application only needs a small amount of electric energy to generate a large amount of water vapor. In the case of the same water vapor yield, the power consumption of the steam heat pump module is only about half of the power consumption of the water vapor generator, achieving a more energy-saving effect. In the case of the same power, the water vapor yield of the steam heat pump module is much larger than the water vapor yield of the steam generator, so that the hydrogen production system of the application can meet the demand of a high-power hydrogen production system.

Description

Technical Field

[0001] This application relates to the field of fuel cell system technology, and more particularly to a hydrogen production system. Background Technology

[0002] With the increasing global demand for renewable energy, hydrogen, as a clean energy carrier, has attracted widespread attention due to its high energy density and environmental friendliness. Solid oxide electrolysis cell (SOEC) technology is a highly efficient water electrolysis technology for hydrogen production. SOEC typically uses ceramic materials as the electrolyte and utilizes the ion conduction properties of solid oxides at high temperatures (usually 600-1000℃) to electrolyze water into hydrogen and oxygen. SOEC technology has advantages such as high electrolysis efficiency, the ability to utilize low-grade heat energy, and good coupling with renewable energy sources, making it a promising candidate for renewable energy storage and conversion, especially in the storage of intermittent energy sources such as wind and solar power.

[0003] Traditional SOEC systems typically rely on steam generators to provide the steam needed for electrolysis. These steam generators work by vaporizing liquid water through electric heating. However, this design has several significant drawbacks: First, the electric heating process requires a large amount of electrical energy to heat the water to its vaporization temperature, leading to reduced overall system energy efficiency and high energy consumption. Second, electric heating is inefficient, and the steam generator suffers significant energy losses during conversion, failing to fully utilize the input energy. Finally, in large-scale applications, traditional steam generators struggle to provide sufficient steam flow to support high-power electrolysis processes, limiting the scalability and application scope of SOEC systems. Utility Model Content

[0004] This application provides a hydrogen production system that solves the problems of low overall energy efficiency, high energy consumption, large energy loss, and difficulty in providing sufficient steam flow to support high-power electrolysis processes in systems that rely on steam generators to provide the steam required for electrolysis.

[0005] To achieve the above objectives, this application provides a hydrogen production system, comprising: an electrolyzer module including a fuel cell test furnace, a hydrogen storage tank, a fuel gas preheater, and an air preheater; the first inlet of the hydrogen storage tank is connected to a hydrogen source, the outlet of the hydrogen storage tank is connected to the inlet of the fuel gas preheater, the outlet of the fuel gas preheater is connected to the fuel gas inlet of the fuel cell in the fuel cell test furnace, the inlet of the air preheater is connected to an air source, and the outlet of the air preheater is connected to the air inlet of the fuel cell in the fuel cell test furnace; and a vapor heat pump module including: a heat pump assembly, a water storage tank, and a flash tank; the heat pump assembly includes a condenser, the first inlet of the water storage tank is connected to a water source, the outlet of the water storage tank is connected to the cold side inlet of the condenser, the cold side outlet of the condenser is connected to the inlet of the flash tank, and the outlet of the flash tank is connected to the inlet of the fuel gas preheater.

[0006] In some embodiments, the vapor heat pump module further includes: a valve body, an outlet of a water storage tank connected to a first inlet of the valve body, an outlet of a flash tank connected to a second inlet of the valve body, and an outlet of the valve body connected to the cold side inlet of the condenser.

[0007] In some embodiments, the vapor heat pump module further includes: a circulation pump, the outlet of the valve body being connected to the inlet of the circulation pump, and the outlet of the circulation pump being connected to the cold side inlet of the condenser.

[0008] In some embodiments, the electrolytic cell module further includes: a fuel gas heat exchanger, the outlet of the hydrogen storage tank and the outlet of the flash tank being connected to the cold side inlet of the fuel gas heat exchanger, the cold side outlet of the fuel gas heat exchanger being connected to the inlet of the fuel gas preheater, and the fuel gas outlet of the fuel cell stack in the fuel cell stack test furnace being connected to the hot side inlet of the fuel gas heat exchanger.

[0009] In some embodiments, the electrolytic cell module further includes a gas-liquid separator, wherein the hot-side outlet of the fuel gas heat exchanger is connected to the inlet of the gas-liquid separator.

[0010] In some embodiments, the outlet of the gas-liquid separator is connected to the second inlet of the hydrogen storage tank.

[0011] In some embodiments, the outlet of the gas-liquid separator is connected to the second inlet of the water storage tank.

[0012] In some embodiments, the electrolytic cell module further includes: an air heat exchanger, the cold-side inlet of which is connected to an air source, the cold-side outlet of which is connected to the inlet of an air preheater, and the air outlet of the fuel cell stack in the fuel cell stack test furnace is connected to the hot-side inlet of the air heat exchanger.

[0013] In some embodiments, the heat pump assembly further includes an evaporator, the cold-side inlet of which is connected to the hot-side outlet of the condenser, and the cold-side outlet of the evaporator is connected to the hot-side inlet of the condenser; wherein the hot-side outlet of the air heat exchanger is connected to the hot-side inlet of the evaporator.

[0014] In some embodiments, the heat pump assembly further includes a compressor and an expansion valve, the compressor being connected between the cold-side outlet of the evaporator and the hot-side inlet of the condenser, and the expansion valve being connected between the hot-side outlet of the condenser and the cold-side inlet of the evaporator.

[0015] This application utilizes heat exchange between the refrigerant within a heat pump assembly and water entering from the cold side inlet of the condenser. The heated water is then fed into a flash tank to generate steam, which is then used to supply steam from the fuel gas to the fuel cell stack in the test furnace of the electrolysis cell module. Compared to traditional steam generators, this application's steam heat pump module requires only a small amount of electricity to produce a large amount of steam. With the same steam yield, the power consumption of the steam heat pump module is only about half that of a steam generator, achieving a significantly higher energy efficiency. This substantial energy saving not only reduces system operating costs but also improves overall energy efficiency. Furthermore, with the same power output, the steam output of the steam heat pump module is far greater than that of a steam generator. This characteristic enables the hydrogen production system of this application to meet the needs of high-power hydrogen production systems, expanding its potential for large-scale applications. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0018] Figure 1 This is a schematic diagram of the hydrogen production system provided in the embodiments of this application. Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the hydrogen production system provided in the embodiments of this application. Figure 2 .

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Electrolytic cell module; 2. Steam heat pump module;

[0022] 11. Fuel stack test furnace; 12. Hydrogen storage tank; 13. Fuel gas preheater; 14. Air preheater; 15. Fuel gas heat exchanger; 16. Gas-liquid separator; 17. Air heat exchanger;

[0023] 21. Heat pump assembly; 22. Water storage tank; 23. Flash tank; 24. Valve body; 25. Circulation pump;

[0024] 211. Condenser; 212. Evaporator; 213. Compressor; 214. Expansion valve. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0026] Please see Figure 1 This application provides a hydrogen production system. The hydrogen production system includes an electrolyzer module 1 and a vapor heat pump module 2.

[0027] Please see Figure 2 The electrolytic cell module 1 includes: a fuel cell stack test furnace 11, a hydrogen storage tank 12, a fuel gas preheater 13, and an air preheater 14. The first inlet of the hydrogen storage tank 12 is used to connect to a hydrogen source, and the outlet of the hydrogen storage tank 12 is connected to the inlet of the fuel gas preheater 13. The outlet of the fuel gas preheater 13 is connected to the fuel gas inlet of the fuel cell stack in the fuel cell stack test furnace 11. The inlet of the air preheater 14 is used to connect to an air source, and the outlet of the air preheater 14 is connected to the air inlet of the fuel cell stack in the fuel cell stack test furnace 11. In this embodiment, the inlet of the air preheater 14 is used to connect to an air source; in other embodiments, the inlet of the air preheater 14 can also be used to connect to nitrogen, a mixture of air and nitrogen, etc.

[0028] Please see Figure 2 The vapor heat pump module 2 includes a heat pump assembly 21, a water storage tank 22, and a flash tank 23. The heat pump assembly 21 includes a condenser 211, an evaporator 212, a compressor 213, and an expansion valve 214. The cold-side inlet of the evaporator 212 is connected to the hot-side outlet of the condenser 211, and the cold-side outlet of the evaporator 212 is connected to the hot-side inlet of the condenser 211. The compressor 213 is connected between the cold-side outlet of the evaporator 212 and the hot-side inlet of the condenser 211. The expansion valve 214 is connected between the hot-side outlet of the condenser 211 and the cold-side inlet of the evaporator 212. In the evaporator 212, the refrigerant absorbs heat, evaporates, and becomes a gas. The gaseous refrigerant is compressed by the compressor 213, increasing its pressure and temperature, allowing it to release heat in the condenser 211. The high-temperature, high-pressure refrigerant releases heat in the condenser 211 and condenses into a liquid. The liquid refrigerant, through the expansion valve 214, reduces its pressure and temperature and returns to the evaporator 212, starting a new cycle.

[0029] The water storage tank 22 has a first inlet for connecting to a water source, an outlet for connecting to the cold side inlet of the condenser 211, a cold side outlet for connecting to the inlet of the flash tank 23, and an outlet for connecting to the inlet of the fuel gas preheater 13. In this embodiment, the water at the cold side inlet of the condenser 211 is heated by the heat released by the high-temperature, high-pressure refrigerant in the condenser 211.

[0030] The refrigerant in the heat pump assembly 21 exchanges heat with water entering from the cold side inlet of the condenser 211, causing the heated water to be passed into the flash tank 23 to generate steam. This steam then provides the fuel gas for the fuel cell stack in the fuel cell stack test furnace 11 of the electrolysis cell module 1. Compared to traditional steam generators, the steam heat pump module of this application requires only a small amount of electricity to generate a large amount of steam. With the same steam yield, the power consumption of the steam heat pump module is only about half that of the steam generator, achieving a more energy-efficient effect. This significant energy saving not only reduces the system's operating costs but also improves overall energy efficiency. With the same power output, the steam heat pump module produces significantly more steam than the steam generator. This characteristic enables the hydrogen production system of this application to meet the needs of high-power hydrogen production systems, expanding its potential for large-scale applications.

[0031] Please see Figure 2 The vapor heat pump module 2 also includes: a valve body 24, with the outlet of the water storage tank 22 connected to the first inlet of the valve body 24, the liquid outlet of the flash tank 23 connected to the second inlet of the valve body 24, and the outlet of the valve body 24 connected to the cold side inlet of the condenser 211. Specifically, the valve body 24 is a three-way valve. This allows for the recycling of water from the outlet of the flash tank 23, improving water utilization efficiency, reducing the demand for external water sources, thereby reducing the operating costs of the hydrogen production system, reducing wastewater discharge, minimizing environmental impact, and supporting a more sustainable production process.

[0032] Please see Figure 2 The vapor heat pump module 2 also includes a circulation pump 25, with the outlet of the valve body 24 connected to the inlet of the circulation pump 25, and the outlet of the circulation pump 25 connected to the cold-side inlet of the condenser 211. The circulation pump 25 maintains water flow, ensuring continuous operation and stability of the system, promoting water entry into the condenser 211 for heat exchange, and helping to improve heat exchange efficiency, enabling the hydrogen production system to utilize thermal energy more effectively.

[0033] Please see Figure 2In this embodiment, the electrolysis cell module 1 further includes a fuel gas heat exchanger 15. The outlet of the hydrogen storage tank 12 and the outlet of the flash tank 23 are connected to the cold side inlet of the fuel gas heat exchanger 15, the cold side outlet of the fuel gas heat exchanger 15 is connected to the inlet of the fuel gas preheater 13, and the fuel gas outlet of the fuel cell stack in the fuel cell stack test furnace 11 is connected to the hot side inlet of the fuel gas heat exchanger 15. In the electrolytic cell module 1, since the reaction temperature of the fuel cell in the fuel cell test furnace 11 reaches 600-1000℃, the exhaust gas from the fuel gas outlet of the fuel cell in the fuel cell test furnace 11 after the reaction is a high-temperature gas. Even if the exhaust gas temperature may drop by 100-300℃ due to losses during pipeline transportation, the exhaust gas temperature is still at a high temperature. In this embodiment, the exhaust gas from the fuel cell in the fuel cell test furnace 11 is heat-exchanged with the fuel gas at the cold side inlet of the fuel gas heat exchanger 15. The waste heat of the exhaust gas from the fuel cell in the fuel cell test furnace 11 is used to preheat the fuel gas at the cold side inlet of the fuel gas heat exchanger 15. This can reduce the demand for external heat sources, improve the energy efficiency of the entire system, reduce energy consumption, and thus reduce the operating cost of the system.

[0034] Please see Figure 2 In this embodiment, the electrolytic cell module 1 further includes a gas-liquid separator 16. The hot-side outlet of the fuel gas heat exchanger 15 is connected to the inlet of the gas-liquid separator 16.

[0035] The outlet of the gas-liquid separator 16 is connected to the second inlet of the hydrogen storage tank 12. This allows for the recovery and reuse of hydrogen from the gas-liquid separation of the exhaust gas at the hot side outlet of the fuel gas heat exchanger 15, improving the hydrogen recovery rate, reducing the demand for external hydrogen, thereby increasing the efficiency of the entire hydrogen production system, reducing hydrogen procurement costs, lowering overall operating costs, reducing hydrogen emissions, reducing environmental impact, and supporting a more sustainable energy production approach.

[0036] The outlet of the gas-liquid separator 16 is connected to the second inlet of the water storage tank 22. This allows for gas-liquid separation of the exhaust gas from the hot side outlet of the fuel gas heat exchanger 15. The separated liquid is then recycled, improving water resource utilization efficiency, reducing the need for external water sources, thereby lowering the operating costs of the hydrogen production system, reducing wastewater discharge, minimizing environmental impact, and supporting a more sustainable production process.

[0037] Please see Figure 2In this embodiment, the electrolytic cell module 1 further includes an air heat exchanger 17. The cold-side inlet of the air heat exchanger 17 is used to connect to an air source, the cold-side outlet of the air heat exchanger 17 is connected to the inlet of the air preheater 14, and the air outlet of the fuel cell stack in the fuel cell stack test furnace 11 is connected to the hot-side inlet of the air heat exchanger 17. In the electrolytic cell module 1, since the reaction temperature of the fuel cell in the fuel cell test furnace 11 reaches 600-1000℃, the exhaust gas from the air outlet of the fuel cell in the fuel cell test furnace 11 after the reaction is a high-temperature gas. Even if the exhaust gas temperature may drop by 100-300℃ due to losses during pipeline transportation, the exhaust gas temperature is still at a high temperature. In this embodiment, the exhaust gas from the air outlet of the fuel cell in the fuel cell test furnace 11 is heat-exchanged with the air at the cold side inlet of the air heat exchanger 17. The waste heat of the exhaust gas from the air outlet of the fuel cell in the fuel cell test furnace 11 is used to preliminarily heat up the air at the cold side inlet of the air heat exchanger 17, which can reduce the demand for external heat sources, improve the energy efficiency of the entire system, reduce energy consumption, and thus reduce the operating cost of the system.

[0038] Please see Figure 2 The hot-side outlet of the air heat exchanger 17 is connected to the hot-side inlet of the evaporator 212. The temperature of the exhaust gas from the air outlet of the fuel cell stack in the fuel cell stack test furnace 11 after heat exchange with the air at the cold-side inlet of the air heat exchanger 17 is between 50°C and 100°C. Compared to the conventional method of collecting or discharging the exhaust gas from the hot-side outlet of the air heat exchanger 17 by lowering its temperature below 50°C through a circulating cooling water system, this application exchanges heat between the exhaust gas from the hot-side outlet of the air heat exchanger 17 and the refrigerant at the cold-side inlet of the evaporator 212. This allows the exhaust gas from the hot-side outlet of the air heat exchanger 17 to meet the standard for discharge into the ambient temperature atmosphere after heat exchange, reducing the power consumption of the entire system and the maintenance of multiple systems. The refrigerant absorbs the low-grade heat from the exhaust gas at the hot side outlet of the air heat exchanger 17, converts it into high-grade heat after passing through the compressor 213, and then exchanges heat with the water entering from the cold side inlet of the condenser 211. The heated water is then passed into the flash tank 23 to generate water vapor, which utilizes the heat of the exhaust gas at the hot side outlet of the air heat exchanger 17. This reduces the demand for external heat sources, improves the energy efficiency of the entire system, reduces energy consumption, and thus reduces the operating cost of the system.

[0039] In the startup phase of the hydrogen production system described in this application: a small amount of air exists in the pipeline of the fuel cell test furnace 11. A small amount of hydrogen from the hydrogen source enters the cold side inlet of the fuel gas heat exchanger 15 through the hydrogen storage tank 12. After being heated by the fuel gas preheater 13, the hydrogen enters the fuel cell stack in the fuel cell test furnace 11 through the fuel gas inlet. The temperature of the air and hydrogen in the fuel cell stack in the fuel cell test furnace 11 reaches 600-1000°C. The high-temperature exhaust gas from the air outlet of the fuel cell stack in the fuel cell test furnace 11 enters the hot side inlet of the air heat exchanger 17 and exchanges heat with the air source entering from the cold side inlet of the air heat exchanger 17. After the heat circulation meets the requirements, the hydrogen production system begins to operate normally.

[0040] In the water vapor supply stage of the hydrogen production system of this application: low-grade heat from the hot side outlet of the air heat exchanger 17 enters the hot side inlet of the evaporator 212 and exchanges heat with the refrigerant entering from the cold side inlet of the evaporator 212. The exhaust gas from the hot side outlet of the air heat exchanger 17 provides low-grade heat to the heat pump assembly 21. Then, the refrigerant in the heat pump assembly 21 undergoes continuous gas-liquid transformation through the action of the evaporator 212, compressor 213, condenser 211 and expansion valve 214, completing the heat absorption and release process to convert low-grade heat into high-grade heat (that is, converting low-grade heat in the evaporator 212 into high-grade heat in the condenser 211). Meanwhile, the water source passes through the water storage tank 22, valve body 24, and then through the circulation pump 25 before entering the cold side inlet of the condenser 211 to absorb the high-grade heat of the refrigerant in the condenser 211. After being heated, the water source enters the flash tank 23. Part of it is sprayed out in the form of water vapor to provide water vapor from the fuel gas in the fuel cell stack test furnace 11 of the electrolytic cell module 1. The other part still flows to the bottom of the flash tank 23 in liquid form and is repeatedly circulated from the liquid outlet of the flash tank 23 through the valve body 24 and the circulation pump 25.

[0041] During the normal operation phase of the hydrogen production system of this application: the hydrogen gas from the outlet of the hydrogen storage tank 12 and the water vapor from the outlet of the flash tank 23 enter the cold side inlet of the fuel gas heat exchanger 15, where they exchange heat with the high-temperature tail gas from the fuel gas outlet of the fuel cell stack in the fuel cell stack test furnace 11. The temperature is raised to 500°C and then enters the fuel gas preheater 13 from the cold side outlet of the fuel gas heat exchanger 15. After being heated to 700°C in the fuel gas preheater 13, the tail gas enters the fuel cell stack in the fuel cell stack test furnace 11 from the fuel gas inlet of the fuel cell stack test furnace 11 for heat preservation treatment. After the tail gas cools down after heat exchange in the fuel gas heat exchanger 15, it enters the gas-liquid separator 16 from the hot side outlet of the fuel gas heat exchanger 15. The gas enters the hydrogen storage tank 12 from the outlet of the gas-liquid separator 16 as a device integrating circulation and storage. The liquid flows into the water storage tank 22 together with the water source through the liquid outlet of the gas-liquid separator 16 as the input part of the water source.

[0042] Air enters the cold side inlet of air heat exchanger 17 and exchanges heat with the high-temperature exhaust gas from the air outlet of the fuel cell stack in fuel cell stack test furnace 11. The exhaust gas is heated to 500°C and then enters the air preheater 14 from the cold side outlet of air heat exchanger 17. After being heated to 700°C in air preheater 14, the exhaust gas enters the fuel cell stack in fuel cell stack test furnace 11 from the air inlet of fuel cell stack test furnace 11 for heat preservation. After the exhaust gas is cooled down after heat exchange in air heat exchanger 17, it provides low-grade heat to heat pump assembly 21, achieving the coupling purpose between electrolytic cell module 1 and steam heat pump module.

[0043] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0044] In the above embodiments, the descriptions of each embodiment have their own emphasis. Parts not described in detail in a particular embodiment can be referred to in the relevant descriptions of other embodiments. The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0045] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A hydrogen production system, characterized in that, include: An electrolytic cell module (1) includes a fuel cell test furnace (11), a hydrogen storage tank (12), a fuel gas preheater (13), and an air preheater (14). The first inlet of the hydrogen storage tank (12) is used to connect to a hydrogen source. The outlet of the hydrogen storage tank (12) is connected to the inlet of the fuel gas preheater (13). The outlet of the fuel gas preheater (13) is connected to the fuel gas inlet of the fuel cell in the fuel cell test furnace (11). The inlet of the air preheater (14) is used to connect to an air source. The outlet of the air preheater (14) is connected to the air inlet of the fuel cell in the fuel cell test furnace (11). as well as A steam heat pump module (2) includes: a heat pump assembly (21), a water storage tank (22), and a flash tank (23). The heat pump assembly (21) includes a condenser (211). The first inlet of the water storage tank (22) is used to connect to a water source. The outlet of the water storage tank (22) is connected to the cold side inlet of the condenser (211). The cold side outlet of the condenser (211) is connected to the inlet of the flash tank (23). The gas outlet of the flash tank (23) is connected to the inlet of the fuel gas preheater (13).

2. The hydrogen production system according to claim 1, characterized in that, The steam heat pump module (2) further includes: a valve body (24), the outlet of the water storage tank (22) is connected to the first inlet of the valve body (24), the liquid outlet of the flash tank (23) is connected to the second inlet of the valve body (24), and the outlet of the valve body (24) is connected to the cold side inlet of the condenser (211).

3. The hydrogen production system according to claim 2, characterized in that, The vapor heat pump module (2) further includes: a circulation pump (25), the outlet of the valve body (24) is connected to the inlet of the circulation pump (25), and the outlet of the circulation pump (25) is connected to the cold side inlet of the condenser (211).

4. The hydrogen production system according to claim 1, characterized in that, The electrolytic cell module (1) further includes: a fuel gas heat exchanger (15), the outlet of the hydrogen storage tank (12) and the outlet of the flash tank (23) are connected to the cold side inlet of the fuel gas heat exchanger (15), the cold side outlet of the fuel gas heat exchanger (15) is connected to the inlet of the fuel gas preheater (13), and the fuel gas outlet of the fuel cell stack in the fuel cell stack test furnace (11) is connected to the hot side inlet of the fuel gas heat exchanger (15).

5. The hydrogen production system according to claim 4, characterized in that, The electrolytic cell module (1) further includes a gas-liquid separator (16), and the hot side outlet of the fuel gas heat exchanger (15) is connected to the inlet of the gas-liquid separator (16).

6. The hydrogen production system according to claim 5, characterized in that, The outlet of the gas-liquid separator (16) is connected to the second inlet of the hydrogen storage tank (12).

7. The hydrogen production system according to claim 5, characterized in that, The outlet of the gas-liquid separator (16) is connected to the second inlet of the water storage tank (22).

8. The hydrogen production system according to claim 1, characterized in that, The electrolytic cell module (1) further includes an air heat exchanger (17), the cold side inlet of which is used to connect to the air source, the cold side outlet of which is connected to the inlet of the air preheater (14), and the air outlet of the fuel cell stack in the fuel cell stack test furnace (11) is connected to the hot side inlet of the air heat exchanger (17).

9. The hydrogen production system according to claim 8, characterized in that, The heat pump assembly (21) further includes an evaporator (212), the cold side inlet of which is connected to the hot side outlet of the condenser (211), and the cold side outlet of the evaporator (212) is connected to the hot side inlet of the condenser (211). The hot-side outlet of the air heat exchanger (17) is connected to the hot-side inlet of the evaporator (212).

10. The hydrogen production system according to claim 9, characterized in that, The heat pump assembly (21) further includes a compressor (213) and an expansion valve (214), the compressor (213) being connected between the cold-side outlet of the evaporator (212) and the hot-side inlet of the condenser (211), and the expansion valve (214) being connected between the hot-side outlet of the condenser (211) and the cold-side inlet of the evaporator (212).

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