Hydrogen production system

Abstract

The utility model discloses a hydrogen production system, which comprises an AEM electric pile, at least one hydrogen side gas-water separator and a water-sealed tank, and the AEM electric pile is used for electrolyzing alkali liquor; any hydrogen side gas-water separator comprises a first inlet, a first gas phase outlet and a first liquid phase outlet; wherein the first inlet is communicated with a hydrogen side outlet of the AEM electric pile; and the water-sealed tank is communicated with the first liquid phase outlet of any hydrogen side gas-water separator, so that liquid separated from gas and water in the hydrogen side gas-water separator is output to the water-sealed tank. According to the utility model, the alkali liquor on the hydrogen side does not flow back to the AEM galvanic pile any more, so that the complexity of the process and the workload of electrical installation control and later debugging are reduced, the production efficiency is improved, and the production cost is reduced.

Description

Technical Field

[0001] This utility model relates generally to the technical field of hydrogen production, and more specifically to a hydrogen production system. Background Technology

[0002] Currently, the technology for AEM water electrolysis hydrogen production equipment is not yet mature, and most of them still use the hydrogen production process of alkaline water electrolysis cells. However, the difference between AEM water electrolysis hydrogen production and alkaline water electrolysis hydrogen production is that the main output from the cathode side of the electrolyzer is hydrogen gas, while carrying a small amount of water. Therefore, the method of controlling the pressure of the system by comparing the liquid level deviation in the previous alkaline water electrolysis hydrogen production process is not applicable in this scenario. Even if some AEM water electrolysis hydrogen production processes achieve separate pressure control on the hydrogen and oxygen sides, the small amount of water carried out on the hydrogen side requires the addition of a liquid level control discharge valve during the process of hydrogen-side water returning to the oxygen-side alkaline solution and returning to the electrolyzer. This increases the complexity of the process, the workload of electrical installation and control, and subsequent commissioning, reduces production efficiency, increases production costs, and causes unnecessary waste of resources.

[0003] Therefore, there is a need to provide a hydrogen production system to at least partially solve the above problems. Utility Model Content

[0004] The utility model description section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This utility model description section is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] To at least partially solve the above problems, a first aspect of this utility model provides a hydrogen production system, comprising:

[0006] AEM fuel cell stack, wherein the AEM fuel cell stack is used for electrolyzing alkaline solution;

[0007] At least one hydrogen-side gas-water separator, each of the hydrogen-side gas-water separators including a first inlet, a first gas phase outlet and a first liquid phase outlet;

[0008] The first inlet is connected to the hydrogen-side outlet of the AEM stack;

[0009] A water seal tank is connected to the first liquid phase outlet of any of the hydrogen-side gas-water separators, so that the liquid separated from the gas and water in the hydrogen-side gas-water separator is output to the water seal tank.

[0010] Optionally, the hydrogen production system further includes:

[0011] A hydrogen output pipeline, along the hydrogen flow path, is connected to the first gas phase outlet of the hydrogen-side gas-water separator furthest from the AEM stack.

[0012] A hydrogen-side pressure regulating valve is installed on the hydrogen output pipeline.

[0013] Optionally, the hydrogen production system further includes:

[0014] An oxygen-side gas-liquid separator, comprising a second inlet, a second gas phase outlet, and a second liquid phase outlet, wherein the second inlet is connected to the oxygen-side outlet of the AEM stack via a pipeline;

[0015] The second liquid phase outlet is connected to the liquid inlet of the AEM stack so that the liquid separated from the gas and water in the oxygen-side gas-water separator flows back to the AEM stack.

[0016] Optionally, the hydrogen production system further includes:

[0017] An oxygen output pipeline is connected to the second gas phase outlet of the oxygen-side gas-water separator.

[0018] An oxygen-side pressure regulating valve is installed on the oxygen output pipeline.

[0019] Optionally, the hydrogen-side gas-water separator includes a hydrogen-side primary gas-water separator and a hydrogen-side secondary gas-water separator;

[0020] The first inlet of the hydrogen-side primary gas-water separator is connected to the hydrogen-side outlet of the AEM stack via a pipeline, and the first inlet of the hydrogen-side secondary gas-water separator is connected to the first gas phase outlet of the hydrogen-side primary gas-water separator.

[0021] Optionally, the hydrogen production system further includes a cooler, the two ends of which are respectively connected to the first gas phase outlet of the hydrogen-side primary gas-water separator and the first inlet of the hydrogen-side secondary gas-water separator.

[0022] Optionally, the hydrogen production system further includes:

[0023] An alkaline heat exchanger, the two ends of which are respectively connected to the second liquid phase outlet of the oxygen-side gas-water separator and the liquid inlet of the AEM stack.

[0024] Optionally, the hydrogen production system further includes:

[0025] A heater, the two ends of which are respectively connected to the alkali heat exchanger and the liquid inlet of the AEM stack.

[0026] Optionally, the hydrogen production system further includes:

[0027] An alkaline solution filter, the two ends of which are respectively connected to the inlet of the heater and the inlet of the AEM stack.

[0028] Optionally, the hydrogen production system further includes:

[0029] An alkali circulation pump is installed on the pipeline connecting the alkali heat exchanger to the second liquid phase outlet of the oxygen-side gas-liquid separator to promote alkali flow.

[0030] According to this utility model, in a hydrogen production system, the liquid phase outlet of the hydrogen-side gas-water separator is connected to a water-sealed tank, preventing the hydrogen-side alkaline solution (after merging with the oxygen-side alkaline solution) from flowing back to the AEM fuel cell stack. Therefore, the pressures on both the hydrogen and oxygen sides of the production system can be controlled and regulated separately, eliminating the need for a cumbersome process of adding liquid level discharge control to the circuit where the alkaline solutions merge on both sides. This reduces process complexity, electrical installation and control workload, and subsequent commissioning, thereby improving production efficiency and lowering production costs. Attached Figure Description

[0031] The following drawings, which illustrate embodiments of the present invention, are incorporated herein as part of the present invention for understanding the invention. The drawings show embodiments of the present invention and their descriptions, serving to explain the principles of the present invention. In the drawings,

[0032] Figure 1 This is a schematic diagram of a hydrogen production system according to a preferred embodiment of the present invention;

[0033] Figure 2 for Figure 1 A magnified view of part A in the middle.

[0034] Explanation of reference numerals in the attached figures:

[0035] 111: AEM stack 1111: Hydrogen side outlet

[0036] 1112: Oxygen-side outlet; 1113: Liquid inlet

[0037] 121: Oxygen-side gas-water separator; 1211: Second inlet

[0038] 1212: Second gas phase outlet; 1213: Second liquid phase outlet

[0039] 1214: Second supply port; 122: Heater

[0040] 123: Alkali solution filter 124: Alkali solution heat exchanger

[0041] 125: Alkali circulation pump; 126: Oxygen-side pressure regulating valve

[0042] 127: Oxygen output pipeline; 131: Hydrogen-side primary gas-water separator

[0043] 1311: First inlet; 1312: First gas phase outlet

[0044] 1313: First liquid phase outlet; 1314: First supply port

[0045] 132: Cooler; 133: Hydrogen-side secondary gas-water separator

[0046] 1331: First inlet; 1332: First gas phase outlet

[0047] 1333: First liquid phase outlet; 134: Water seal tank

[0048] 135: First gas-water separation discharge valve; 136: Hydrogen-side pressure regulating valve

[0049] 137: Hydrogen-side vent valve; 138: Second gas-water separator discharge valve

[0050] 139: Hydrogen output pipeline Detailed Implementation

[0051] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0052] To fully understand this invention, a detailed description will be set forth in the following description. It should be understood that these embodiments are provided so that the disclosure of this invention is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. Obviously, the implementation of embodiments of this invention is not limited to the specific details familiar to those skilled in the art. Preferred embodiments of this invention are described in detail below; however, other embodiments may be available in addition to these detailed descriptions.

[0053] The ordinal numbers such as "first" and "second" used in this invention are merely identifiers and have no other meaning, such as a specific order. Furthermore, for example, the term "first component" does not imply the existence of "second component," and the term "second component" does not imply the existence of "first component."

[0054] It should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer" and similar expressions used in this utility model are for illustrative purposes only and are not intended to be limiting.

[0055] This utility model discloses a hydrogen production system.

[0056] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings.

[0057] like Figure 1 As shown, in a preferred embodiment, a hydrogen production system includes: an AEM fuel cell stack 111, at least one hydrogen-side gas-water separator, and a water seal tank 134.

[0058] The AEM stack 111 is used for electrolyzing alkaline solutions. The AEM stack 111 contains an AEM membrane, which selectively transports anions (such as hydroxide ions OH-) while blocking the passage of cations, thereby achieving a highly selective and efficient electrochemical process. The alkaline solution can be KOH solution. The AEM stack 111 in the figure includes three interfaces.

[0059] Each hydrogen-side gas-liquid separator includes a first inlet, a first gas phase outlet, and a first liquid phase outlet; the first inlet is used to input hydrogen gas output from the AEM stack 111, the first gas phase outlet is used to output hydrogen gas after gas-liquid separation, and the first liquid phase outlet is used to output liquid gas after gas-liquid separation.

[0060] The first inlet is connected to the hydrogen-side outlet 1111 of the AEM stack 111;

[0061] The water seal tank 134 is connected to the first liquid phase outlet of any hydrogen-side gas-water separator so that the liquid separated from the gas and water in the hydrogen-side gas-water separator is output to the water seal tank 134.

[0062] In this embodiment of the hydrogen production system, the liquid phase outlet of the hydrogen-side gas-water separator is connected to a water-sealed tank, preventing the hydrogen-side alkaline solution (after merging with the oxygen-side alkaline solution) from flowing back to the AEM stack. Therefore, the pressures on both the hydrogen and oxygen sides of the production system can be controlled and regulated separately. This eliminates the need for a cumbersome process of adding liquid level discharge control to the circuit where the alkaline solutions merge on both sides, reducing process complexity, electrical installation and control workload, and subsequent commissioning, thereby improving production efficiency and reducing production costs.

[0063] In one implementation, such as Figure 1 As shown, the hydrogen production system also includes:

[0064] Hydrogen output line 139, along the hydrogen flow path, is connected to the first gas phase outlet of the hydrogen-side gas-water separator furthest from the AEM stack 111.

[0065] Hydrogen-side pressure regulating valve 136 is installed on hydrogen output pipeline 139.

[0066] like Figure 1 As shown, in this embodiment, the hydrogen-side gas-water separator includes a hydrogen-side primary gas-water separator 131 and a hydrogen-side secondary gas-water separator 133.

[0067] The first inlet 1311 of the hydrogen-side primary gas-water separator 131 is connected to the hydrogen-side outlet 1111 of the AEM stack 111 via a pipeline, and the first inlet 1331 of the hydrogen-side secondary gas-water separator 133 is connected to the first gas phase outlet 1312 of the hydrogen-side primary gas-water separator 131.

[0068] The hydrogen-side primary gas-liquid separator 131 is connected to the AEM fuel cell stack 111 via a pipeline. The hydrogen produced by the AEM fuel cell stack 111 is output to the hydrogen-side primary gas-liquid separator 131. Since the hydrogen also carries alkaline solution, the hydrogen is separated into gas and water in the hydrogen-side primary gas-liquid separator 131.

[0069] The water seal tank 134 is connected to the first liquid phase outlet 1313 of the hydrogen-side primary gas-liquid separator 131 and the first liquid phase outlet 1333 of the hydrogen-side secondary gas-liquid separator 133 via pipelines. The liquid separated from the hydrogen gas in the hydrogen-side primary gas-liquid separator 131 and the hydrogen-side secondary gas-liquid separator 133 is output to the water seal tank 134.

[0070] The hydrogen output pipeline 139 is connected to the first gas phase outlet 1332 of the hydrogen-side secondary gas-water separator 133, and the flow rate of the hydrogen output pipeline 139 is controlled according to the detected pressure in the hydrogen-side secondary gas-water separator 133.

[0071] The hydrogen-side pressure regulating valve 136 can be a PID pneumatic regulating valve. The detection end of the hydrogen-side pressure regulating valve 136 is connected to the hydrogen-side secondary gas-water separator 133. A pressure transmitter is installed at the detection end. The opening or closing is controlled by the pressure value in the hydrogen-side secondary gas-water separator 133. The electrical signal generated by the pressure transmitter is transmitted to the hydrogen-side pressure regulating valve 136 to achieve precise control of the hydrogen-side gas pressure and automatically balance the system pressure.

[0072] Figure 1 The hydrogen-side primary gas-liquid separator 131 includes four interfaces. In addition to the three interfaces mentioned above, a first supply interface 1314 can also be provided, through which the nitrogen supply system and the water supply system are connected. The hydrogen-side secondary gas-liquid separator 133 includes three interfaces: a first inlet 1331, a first gas phase outlet 1332, and a first liquid phase outlet 1333 (the hydrogen-side secondary gas-liquid separator 133 has a similar structure to the hydrogen-side primary gas-liquid separator 131).

[0073] In one implementation, such as Figure 1 As shown, the hydrogen production system also includes:

[0074] The oxygen-side gas-liquid separator 121 includes a second inlet 1211, a second gas phase outlet 1212, and a second liquid phase outlet 1213. The second inlet 1211 is used to input oxygen output from the AEM stack 111, the second gas phase outlet 1212 is used to output oxygen after gas-liquid separation, and the second liquid phase outlet 1213 is used to output liquid after gas-liquid separation.

[0075] The second inlet 1211 is connected to the oxygen-side outlet 1112 of the AEM stack 111 via a pipeline; the oxygen produced by the AEM stack 111 also carries alkaline solution, and the oxygen is separated into gas and water in the oxygen-side gas-water separator 121.

[0076] The second liquid phase outlet 1213 is connected to the liquid inlet 1113 of the AEM stack 111 so that the liquid separated from the gas and water in the oxygen-side gas-water separator 121 flows back to the AEM stack 111.

[0077] Figure 1 The oxygen-side gas-water separator 121 includes four interfaces. In addition to the three interfaces mentioned above, a second supply interface 1214 can also be provided to connect the nitrogen supply system and the water supply system.

[0078] like Figure 1 As shown, the hydrogen production system also includes:

[0079] Oxygen output pipeline 127 is connected to the second gas phase outlet 1212 of oxygen-side gas-water separator 121.

[0080] Oxygen-side pressure regulating valve 126 is installed on oxygen output pipeline 127 and is used to control the flow rate of oxygen output pipeline 127 according to the detected pressure in oxygen-side gas-water separator 121.

[0081] The oxygen-side pressure regulating valve 126 can be a PID pneumatic regulating valve. The detection end of the oxygen-side pressure regulating valve 126 is connected to the oxygen-side gas-liquid separator 121. A pressure transmitter is installed at the detection end. The opening or closing is controlled by the pressure value in the oxygen-side gas-liquid separator 121. The electrical signal generated by the pressure transmitter is transmitted to the oxygen-side pressure regulating valve 126 to achieve precise control of the oxygen-side gas pressure and automatically balance the system pressure.

[0082] Thus, in the hydrogen production system, the oxygen-side alkaline solution of the AEM stack 111 is circulated on one side to drive the operation of the entire system. The pressure on both sides of the hydrogen and oxygen sides is controlled and regulated separately by the hydrogen-side pressure regulating valve 136 and the oxygen-side pressure regulating valve 126, which saves the cumbersome hydrogen-side liquid level control and discharge steps, achieves high efficiency in hydrogen production, and reduces resource waste.

[0083] In one implementation, such as Figure 1 As shown, the hydrogen production system also includes a cooler 132. The two ends of the cooler 132 are respectively connected to the first gas phase outlet 1312 of the hydrogen-side primary gas-water separator 131 and the first inlet 1331 of the hydrogen-side secondary gas-water separator 133. The cooler 132 is used to cool the hydrogen output from the hydrogen-side primary gas-water separator 131. The hydrogen cooled by the cooler 132 is then input into the hydrogen-side secondary gas-water separator 133 for further gas-water separation.

[0084] Figure 1 The intercooler 132 includes four ports: the first and second ports are connected to the cooling system, the third port is connected to the hydrogen-side primary gas-water separator 131, and the fourth port is connected to the hydrogen-side secondary gas-water separator 133.

[0085] Cooling water enters from the first port of cooler 132, exchanges heat with hydrogen in cooler 132, and then exits from the second port, flowing back to the cooling system. The hydrogen is cooled by the cooler, which reduces the solubility of gaseous water in the hydrogen and causes some water to precipitate out, and then it is separated by the hydrogen-side secondary gas-water separator 133.

[0086] In one implementation, such as Figure 1 , Figure 2 As shown, the hydrogen production system also includes:

[0087] The alkaline heat exchanger 124 is connected at both ends to the second liquid phase outlet 1213 of the oxygen-side gas-water separator 121 and the liquid inlet 1113 of the AEM stack 111, respectively.

[0088] The alkali heat exchanger 124 includes four ports. The first and second ports are connected to the cooling system, and the third port is connected to the oxygen-side gas-liquid separator 121. The liquid returning from the oxygen-side gas-liquid separator 121 is still at a relatively high temperature and needs to be cooled by heat exchange in the alkali heat exchanger 124 before flowing back to the AEM stack 111. Cooling water enters from the first port of the alkali heat exchanger 124, exchanges heat with the alkali in the alkali heat exchanger 124, and then exits from the second port, flowing back to the cooling system.

[0089] In one implementation, such as Figure 1 , Figure 2 As shown, the hydrogen production system also includes:

[0090] Heater 122, with its two ends connected to alkaline heat exchanger 124 and liquid inlet 1113 of AEM stack 111, respectively.

[0091] The inlet of heater 122 is connected to the fourth port of alkali heat exchanger 124, and the outlet is connected to AEM stack 111. It is used to heat the alkali solution flowing back to AEM stack 111 so that the temperature of the alkali solution meets the requirements of the hydrogen production process.

[0092] Since the AEM stack 111 has strict requirements for electrolyte temperature during operation, a heater 122 is added to the alkali circuit to work with the alkali heat exchanger 124 in the circuit to achieve precise control of the alkali temperature entering the AEM stack 111.

[0093] In one implementation, such as Figure 1 , Figure 2 As shown, the hydrogen production system also includes:

[0094] The alkaline filter 123 is connected at both ends to the heater 122 and the liquid inlet 1113 of the AEM stack 111, respectively.

[0095] The alkali filter 123 is installed on the pipeline connecting the heater 122 to the AEM stack 111. It is used to filter the reflux alkali solution and prevent impurities from entering the AEM stack 111 with the alkali solution, which could damage the AEM stack 111.

[0096] In one implementation, such as Figure 1 , Figure 2 As shown, the hydrogen production system also includes:

[0097] The alkali circulation pump 125 is installed on the pipeline connecting the alkali heat exchanger 124 to the second liquid phase outlet 1213 of the oxygen-side gas-liquid separator 121, and is used to promote the flow of alkali.

[0098] In one implementation, such as Figure 1 As shown, the hydrogen production system also includes:

[0099] The first gas-liquid separation discharge valve 135 is installed on the drain pipe connecting the hydrogen-side primary gas-liquid separator 131 to the water seal tank 134. One end of the drain pipe can be connected to the fourth interface of the hydrogen-side primary gas-liquid separator 131, and the other end can be connected to the water seal tank 134. It is used to control the opening and closing of the drain pipe according to the detected liquid level in the hydrogen-side primary gas-liquid separator 131.

[0100] The detection end of the first gas-liquid separation discharge valve 135 is connected to the hydrogen-side primary gas-liquid separator 131. A level transmitter is installed at the detection end, which controls the opening or closing of the valve based on the liquid level value in the hydrogen-side primary gas-liquid separator 131. The electrical signal generated by the level transmitter is transmitted to the first gas-liquid separation discharge valve 135. This is an automatic control system that can automatically adjust the discharged liquid according to the liquid level in the hydrogen-side primary gas-liquid separator 131.

[0101] When the alkaline solution entering the hydrogen-side primary gas-liquid separator 131 from the AEM fuel cell stack 111 reaches a certain level, the hydrogen-side primary gas-liquid separator 131 transmits an electrical signal to control the opening of the first gas-liquid separator discharge valve 135, discharging the alkaline solution from the hydrogen-side primary gas-liquid separator 131. When the liquid level is too low, the signal stops, and the first gas-liquid separator discharge valve 135 returns to its normally closed state.

[0102] In one implementation, such as Figure 1 As shown, the hydrogen production system also includes:

[0103] The second gas-liquid separator discharge valve 138 is installed on the drain pipe connecting the hydrogen-side secondary gas-liquid separator 133 to the water seal tank 134. One end of the drain pipe can be connected to the fourth interface of the hydrogen-side secondary gas-liquid separator 133, and the other end can be connected to the water seal tank 134. It is used to control the opening and closing of the drain pipe according to the detected liquid level in the hydrogen-side secondary gas-liquid separator 133.

[0104] The detection end of the second gas-liquid separation discharge valve 138 is connected to the hydrogen-side secondary gas-liquid separator 133. A level transmitter is installed at the detection end, which controls the opening or closing of the valve based on the liquid level value in the hydrogen-side secondary gas-liquid separator 133. The electrical signal generated by the level transmitter is transmitted to the second gas-liquid separation discharge valve 138. This is an automatic control system that can automatically adjust the discharged liquid according to the liquid level in the hydrogen-side secondary gas-liquid separator 133.

[0105] When the liquid level in the hydrogen-side secondary gas-liquid separator 133 entering from the cooler 132 reaches a certain height, the hydrogen-side secondary gas-liquid separator 133 transmits an electrical signal to control the second gas-liquid separator discharge valve 138 to open, discharging the liquid in the hydrogen-side secondary gas-liquid separator 133. When the liquid level is too low, the signal stops, and the second gas-liquid separator discharge valve 138 returns to the normally closed state.

[0106] In one implementation, such as Figure 1 As shown, the hydrogen production system also includes:

[0107] The hydrogen-side vent valve 137 is installed on the hydrogen output pipeline of the hydrogen-side secondary gas-water separator 133 and is located downstream of the hydrogen-side pressure regulating valve 136. It is used to control the opening and closing of the outlet end of the hydrogen output pipeline.

[0108] The hydrogen-side vent valve 137 can also be connected to a purification system, which is used to further improve the purity of hydrogen.

[0109] In one implementation, such as Figure 1 As shown, the oxygen-side gas-liquid separator 121 and the hydrogen-side primary gas-liquid separator 131 are also connected to a nitrogen supply system. The nitrogen supply system is used to purge nitrogen into the oxygen-side gas-liquid separator 121 and the hydrogen-side primary gas-liquid separator 131, which improves system safety. Before starting the hydrogen production equipment, nitrogen purging is required to displace other gases in the system, and the nitrogen is discharged through the vent valve to ensure system cleanliness and safety. Nitrogen purging can also be used to perform system airtightness tests and locate leak sources.

[0110] In one implementation, such as Figure 1 As shown, the oxygen-side gas-water separator 121 and the hydrogen-side primary gas-water separator 131 are also connected to a water replenishment system. The water replenishment system is used to replenish water to the oxygen-side gas-water separator 121 and the hydrogen-side primary gas-water separator 131, which can balance the pressure in the oxygen-side gas-water separator 121 and the hydrogen-side primary gas-water separator 131.

[0111] According to the hydrogen production system of this invention, the liquid phase outlet of the hydrogen-side gas-water separator is connected to the water seal tank, preventing the hydrogen-side alkaline solution (after merging with the oxygen-side alkaline solution) from flowing back to the AEM stack. Therefore, the pressure on both the hydrogen and oxygen sides of the production system can be controlled and regulated separately, eliminating the need for the cumbersome process of adding liquid level discharge control to the circuit where the alkaline solutions merge on both sides. This reduces the complexity of the process, the workload of electrical installation and control, and subsequent commissioning, thereby improving production efficiency and reducing production costs.

[0112] This invention controls the discharge of water during hydrogen-side gas-water separation by adding a gas-water separation discharge valve on the hydrogen side, thereby preventing water from being discharged with hydrogen and improving the dryness of hydrogen.

[0113] This utility model patent achieves high efficiency and precision in hydrogen preparation in AEM electrolyzers, increasing production efficiency, reducing resource waste, and making the production process more precise and reliable.

[0114] The processes and steps described in all the preferred embodiments above are merely examples. Unless adverse effects occur, various processing operations can be performed in a different order than those described above. The order of steps in the above process can also be added, combined, or deleted according to actual needs.

[0115] In understanding the scope of this utility model, the term "comprising" and its derivatives, as used herein, are intended to be open-ended terms that specify the presence of the described features, elements, components, groups, integrals, and / or steps, but do not exclude the presence of other undescribed features, elements, components, groups, integrals, and / or steps. This concept also applies to words with similar meanings, such as the terms "comprising," "having," and their derivatives.

[0116] The term "attached" or "joined" as used herein includes: a construction in which one element is directly fixed to another element by fixing it directly to another element; a construction in which one element is indirectly fixed to another element by fixing it to an intermediate member, which in turn is fixed to another element; and a construction in which one element is integral with another element, that is, one element is substantially part of another element. This definition also applies to words with similar meanings, such as "connect," "joint," "couple," "install," "adhere," "fix," and their derivatives. Finally, degree terms such as "substantially," "approximately," and "approximately" as used herein indicate the amount of deviation from which modifications to the terminology do not significantly alter the final result.

[0117] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for descriptive purposes only and is not intended to limit the scope of the invention. Features described in one embodiment may be applied, alone or in combination with other features, to another embodiment, unless that feature is not applicable in that other embodiment or is otherwise stated.

[0118] This utility model has been described through the above embodiments. However, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit this utility model to the described embodiments. Furthermore, those skilled in the art will understand that this utility model is not limited to the above embodiments, and many more variations and modifications can be made based on the teachings of this utility model, all of which fall within the scope of protection claimed by this utility model.

Claims

1. A hydrogen production system, characterized in that, include: AEM stack (111), the AEM stack (111) being used for electrolyzing alkaline solution; At least one hydrogen-side gas-water separator, each of the hydrogen-side gas-water separators including a first inlet, a first gas phase outlet and a first liquid phase outlet; The first inlet is connected to the hydrogen-side outlet of the AEM stack (111); A water seal tank (134) is connected to the first liquid phase outlet of any of the hydrogen-side gas-water separators, so that the liquid separated from the gas and water in the hydrogen-side gas-water separator is output to the water seal tank (134).

2. The hydrogen production system according to claim 1, characterized in that, The hydrogen production system also includes: A hydrogen output line (139) is connected along the hydrogen flow path to the first gas phase outlet of the hydrogen-side gas-water separator furthest from the AEM stack (111). Hydrogen-side pressure regulating valve (136) is installed on the hydrogen output pipeline (139).

3. The hydrogen production system according to claim 1 or 2, characterized in that, The hydrogen production system also includes: Oxygen-side gas-liquid separator (121), the oxygen-side gas-liquid separator (121) includes a second inlet, a second gas phase outlet and a second liquid phase outlet, wherein the second inlet is connected to the oxygen-side outlet of the AEM stack (111) through a pipeline; The second liquid phase outlet is connected to the liquid inlet of the AEM stack (111) so that the liquid separated from the gas and water in the oxygen-side gas-water separator (121) flows back to the AEM stack (111).

4. The hydrogen production system according to claim 3, characterized in that, The hydrogen production system also includes: An oxygen output pipeline (127) is connected to the second gas phase outlet of the oxygen-side gas-water separator (121); An oxygen-side pressure regulating valve (126) is provided on the oxygen output pipeline (127).

5. The hydrogen production system according to claim 1, characterized in that, The hydrogen-side gas-water separator includes a hydrogen-side primary gas-water separator (131) and a hydrogen-side secondary gas-water separator (133); The first inlet of the hydrogen-side primary gas-water separator (131) is connected to the hydrogen-side outlet of the AEM stack (111) via a pipeline, and the first inlet of the hydrogen-side secondary gas-water separator (133) is connected to the first gas phase outlet of the hydrogen-side primary gas-water separator (131).

6. The hydrogen production system according to claim 5, characterized in that, The hydrogen production system also includes a cooler (132), the two ends of which are connected to the first gas phase outlet of the hydrogen-side primary gas-water separator (131) and the first inlet of the hydrogen-side secondary gas-water separator (133), respectively.

7. The hydrogen production system according to claim 3, characterized in that, The hydrogen production system also includes: Alkali heat exchanger (124), the two ends of which are respectively connected to the second liquid phase outlet of the oxygen-side gas-water separator (121) and the liquid inlet of the AEM stack (111).

8. The hydrogen production system according to claim 7, characterized in that, The hydrogen production system also includes: The heater (122) is connected at both ends to the inlet of the alkaline heat exchanger (124) and the AEM stack (111), respectively.

9. The hydrogen production system according to claim 8, characterized in that, The hydrogen production system also includes: An alkaline filter (123) is provided, with its two ends connected to the inlet of the heater (122) and the AEM stack (111), respectively.

10. The hydrogen production system according to any one of claims 7-9, characterized in that, The hydrogen production system also includes: An alkali circulation pump (125) is installed on the pipeline connecting the alkali heat exchanger (124) to the second liquid phase outlet of the oxygen-side gas-water separator (121) to promote alkali flow.

Images