PEM electrolysis water hydrogen production system

Abstract

The utility model belongs to PEM electrolytic water hydrogen production system technical field, concretely relates to a kind of PEM electrolytic water hydrogen production system, comprising: with the gas-liquid separator being connected to electrolytic cell hydrogen discharge end, the gas outlet end of the gas-liquid separator is connected with the gas inlet end of deoxygen cylinder by valve body one, the exhaust end of the deoxygen cylinder is connected with the gas discharge end of heat exchanger one and heating cylinder by valve body two parallel intercommunication, the gas outlet end of the heat exchanger one and heating cylinder is communicated electrolytic water purification system by valve body three.The utility model by the exhaust end of deoxygen cylinder is preferentially interconnected valve body two, then the gas discharge end of heat exchanger one and heating cylinder is interconnected by valve body two parallel intercommunication, so that gas can selectively enter heat exchanger one or heating cylinder according to the state of actual electrolytic water purification system before entering electrolytic water purification system, thereby the gas temperature during deoxidation can be effectively utilized, to greatly reduce the energy consumption of water chiller and heating cylinder.

Description

Technical Field

[0001] This utility model belongs to the technical field of PEM electrolysis water hydrogen production system, specifically relating to a PEM electrolysis water hydrogen production system. Background Technology

[0002] like Figure 1 As shown, the normal operating temperature of the deoxygenation cylinder in the existing PEM water electrolysis hydrogen production system is above 80℃. The three-way valve between the deoxygenation cylinder and the heating cylinder is located after the heat exchanger at the rear end of the deoxygenation cylinder. This means that all gases must be cooled down before entering the water electrolysis purification system and then heated up in the heating cylinder. As a result, the gas temperature during deoxygenation in the deoxygenation cylinder cannot be effectively utilized, thus greatly increasing the energy consumption of the chiller and the heating cylinder.

[0003] In view of this, the present invention provides a PEM electrolysis water hydrogen production system to solve the above problems. Utility Model Content

[0004] To achieve the above objectives, this utility model provides the following technical solution: a PEM water electrolysis hydrogen production system, comprising: a gas-liquid separator connected to the hydrogen discharge end of the electrolyzer, wherein the gas discharge end of the gas-liquid separator is connected to the gas inlet end of the deoxygenation cylinder through a valve body one, the exhaust end of the deoxygenation cylinder is connected in parallel to the gas discharge end of the heat exchanger one and the heating cylinder through a valve body two, and the gas discharge ends of the heat exchanger one and the heating cylinder are connected to the water electrolysis purification system through a valve body three.

[0005] In a preferred embodiment of the PEM electrolysis water hydrogen production system of this utility model, the cooling water pipeline of the gas-liquid separator, the cooling water pipeline of the second heat exchanger in the electrolysis water purification system, and the cooling water pipeline of the first heat exchanger are connected to the same cooling water circulation system.

[0006] As a preferred embodiment of the PEM water electrolysis hydrogen production system of this utility model, it further includes a drainage collector whose drainage end is connected to the drainage pipeline through valve body four. The liquid discharge end of the gas-liquid separator, the liquid discharge end of heat exchanger two in the water electrolysis purification system and the liquid discharge end of heat exchanger one are also connected to the water inlet end of the drainage collector through valve body five, valve body six and valve body seven respectively.

[0007] As a preferred embodiment of the PEM water electrolysis hydrogen production system of this utility model, a hydrogen venting branch is also connected between the gas-liquid separator and the valve body 2, and the discharge end of the hydrogen venting branch is connected to the hydrogen detection pipeline located at the end of the water electrolysis purification system.

[0008] As a preferred embodiment of the PEM electrolysis water hydrogen production system of this utility model, the hydrogen venting branch includes two valve bodies arranged in parallel, the two valve bodies being an electric control valve and a manual control valve, respectively.

[0009] In a preferred embodiment of the PEM electrolysis water hydrogen production system of this utility model, valve body two and valve body three are both pneumatic three-way valves, valve body one is a pneumatic valve, and valve body five, valve body six, valve body seven and valve body four are all solenoid valves.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] 1. This utility model connects valve body 2 first to the exhaust end of the deoxygenation cylinder, and then connects heat exchanger 1 and the gas inlet end of heating cylinder in parallel through valve body 2. This allows the gas to selectively enter heat exchanger 1 or heating cylinder according to the actual state of the electrolytic water purification system before entering the system. This effectively utilizes the gas temperature during deoxygenation to greatly reduce the energy consumption of the chiller and heating cylinder.

[0012] 2. This utility model provides a hydrogen venting branch that is independently set between the gas-liquid separator and the valve body, allowing hydrogen to be discharged directly through the hydrogen venting branch without passing through the drain collector. This effectively prevents hydrogen from leaking into the sewer pipe due to pressure and flow rate issues.

[0013] 3. The heat exchanger of this utility model and the gas discharge end of the heating cylinder are connected to a three-way electrolytic water purification system through an independent valve body. Compared with the prior art, this reduces the use of one valve body and the program control of that valve body, thereby reducing the cost of the entire hydrogen production system and the probability of program errors. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0015] Figure 1 This is a schematic diagram of the existing technology structure;

[0016] Figure 2 This is a schematic diagram of the structure of this utility model.

[0017] In the diagram: 1. Deoxygenation cylinder; 2. Valve body two; 3. Heat exchanger one; 4. Heating cylinder; 5. Valve body three; 6. Purification cylinder A; 7. Purification cylinder B; 8. Heat exchanger two; 9. Inlet check valve for cylinder A; 10. Inlet check valve for cylinder B; 11. Outlet check valve for cylinder A; 12. Outlet check valve for cylinder B; 14. Gas-liquid separator; 15. Valve body five; 16. Valve body six; 17. Valve body seven; 18. Drainage collector; 19. Valve body four; 20. Hydrogen venting branch; 21. Valve body one. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Example 1:

[0020] This utility model relates to a PEM electrolysis water production system for hydrogen production, such as... Figure 2 As shown, the system includes: a gas-liquid separator 14 connected to the hydrogen emission end of the electrolyzer; the gas emission end of the gas-liquid separator 14 is connected to the inlet end of the deoxygenation cylinder 1 via valve body 21; the exhaust end of the deoxygenation cylinder 1 is connected in parallel to the gas inlet ends of the heat exchanger 3 and the heating cylinder 4 via valve body 2; and the gas exhaust ends of the heat exchanger 3 and the heating cylinder 4 are connected to the electrolytic water purification system via valve body 5. In this embodiment, valve body 2 and valve body 5 are both pneumatic three-way valves, and valve body 21 is a pneumatic valve.

[0021] In this embodiment, the water electrolysis purification system includes purification cylinders A6 and B7 connected in parallel, and a second heat exchanger 8 connected in parallel with purification cylinders A6 and B7 via inlet check valve 9 and outlet check valve 11 of cylinder A, and inlet check valve 10 and outlet check valve 12 of cylinder B, respectively. The second heat exchanger 8 is connected to an external cooling water circulation system. It should be noted that the specific principle and structure of the water electrolysis purification system have been disclosed in a PEM water electrolysis purification system patent with publication number CN222266641U. Please refer to the aforementioned patent for details; further elaboration is omitted here.

[0022] During operation, the hydrogen produced in the electrolytic cell enters the gas-liquid separator 14, where gas and water are separated. The separated hydrogen then enters the deoxygenation cylinder 1 through valve body 21. If the hydrogen contains oxygen, a deoxygenation reaction (at approximately 80°C) is carried out in the deoxygenation cylinder 1 to remove the oxygen. The water produced in the cylinder is then returned to the gas-liquid separator 14 for discharge. The deoxygenated hydrogen is divided into two sections within one regeneration cycle, passing through valve body 2. Specifically, when the purification cylinder A6 is in regeneration mode, the first half of the hydrogen... The hydrogen gas, controlled by valve 2, enters the heating cylinder 4 for heating and then flows into the purification cylinder A6 through valve 5. Because the hydrogen is heated, the temperature inside purification cylinder A6 is high, allowing the water adsorbed by the molecular sieve to evaporate and be discharged, thus regenerating the molecular sieve. After regeneration, the molecular sieve needs to be cooled before it can adsorb water molecules for purification. Therefore, in the latter half, the hydrogen gas, controlled by valve 2, enters the heat exchanger 3 for cooling and then flows into purification cylinder A6 through valve 5 to assist in cooling the molecular sieve inside purification cylinder A6, completing the entire regeneration cycle. It should be noted that the regeneration principle of purification cylinder B7 is the same as that of purification cylinder A6, and will not be elaborated upon here.

[0023] In the above process, since hydrogen utilizes the reaction temperature of the deoxygenation reaction, its heating efficiency is improved while effectively reducing the power consumption of heating cylinder 4. Secondly, in the latter half of the cooling process, only a portion of the hydrogen is cooled, thus further reducing the power consumption of the chiller in the cooling water circulation system connected to heat exchanger 3, achieving the goal of overall system energy saving and efficiency improvement.

[0024] Furthermore, the cooling water pipes of the gas-liquid separator 14, the cooling water pipes of heat exchanger 2 8 and heat exchanger 3 in the electrolytic water purification system can be connected to the same cooling water circulation system. This reduces the need for a separate cooling water circulation system, thereby lowering the overall system cost and space requirements.

[0025] Example 2:

[0026] Based on Embodiment 1, this embodiment also provides a drainage collector 18 for collecting condensate in the gas-liquid separator 14, heat exchanger 3 and heat exchanger 8, so as to recycle and reuse water resources.

[0027] Specifically, such as Figure 2As shown, the drain end of the drain collector 18 is connected to the sewer pipe via valve body 19. The liquid discharge end of the gas-liquid separator 14, the liquid discharge end of the heat exchanger 2 8 in the electrolytic water purification system, and the liquid discharge end of the heat exchanger 11 3 are also connected to the water inlet end of the drain collector 18 via valve body 15, valve body 16, and valve body 17, respectively. In this embodiment, valve body 15, valve body 16, valve body 17, and valve body 19 are all solenoid valves. When the condensate in the gas-liquid separator 14, heat exchanger 11 3, and heat exchanger 2 8 is full, the condensate can be discharged into the drain collector 18 for collection and reuse by opening valve body 15, valve body 16, and valve body 17. At the same time, when the drain collector 18 is full, the water can also be discharged to the drain pipe through valve body 19.

[0028] Example 3:

[0029] like Figure 1 As shown, in the prior art, the venting pipeline for hydrogen depressurization shutdown is connected to the condensate drain pipeline of the drain collector 18. This can cause hydrogen to backflow into the condensate drain pipeline of the drain collector 18 due to pressure and flow rate issues within the system, resulting in hydrogen leakage. Therefore, this embodiment, based on the above-described embodiment one or embodiment two, independently provides a hydrogen venting branch 20.

[0030] Combination Figure 2 As shown, the hydrogen venting branch 20 is independently connected between the gas-liquid separator 14 and the valve body 2, and its discharge end is connected to the hydrogen detection pipeline located at the end of the water electrolysis purification system. During venting, because the hydrogen venting branch 20 is independently set up, the hydrogen does not need to pass through the condensate drain pipeline, thus effectively preventing hydrogen leakage into the condensate drain pipeline.

[0031] Specifically, the hydrogen venting branch 20 includes two valve bodies arranged in parallel, one electrically controlled and one manually controlled. In this embodiment, the electrically controlled valve is a solenoid valve. Through manual and automatic control, venting efficiency can be improved, and multiple pathways can be provided in case of venting failure, thereby enhancing the overall safety of the system.

[0032] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A PEM water electrolysis hydrogen production system, characterized in that, include: A gas-liquid separator (14) is connected to the hydrogen discharge end of the electrolyzer. The gas discharge end of the gas-liquid separator (14) is connected to the gas inlet end of the deoxygenation cylinder (1) through valve body one (21). The exhaust end of the deoxygenation cylinder (1) is connected in parallel to the gas inlet end of the heat exchanger one (3) and the heating cylinder (4) through valve body two (2). The gas discharge ends of the heat exchanger one (3) and the heating cylinder (4) are connected to the electrolytic water purification system through valve body three (5).

2. The PEM water electrolysis hydrogen production system according to claim 1, characterized in that: The cooling water pipeline of the gas-liquid separator (14), the cooling water pipeline of the second heat exchanger (8) in the electrolytic water purification system, and the cooling water pipeline of the first heat exchanger (3) are connected to the same cooling water circulation system.

3. The PEM water electrolysis hydrogen production system according to claim 2, characterized in that: It also includes a drain collector (18) whose drain end is connected to the drain pipe through valve body four (19). The liquid discharge end of the gas-liquid separator (14), the liquid discharge end of the heat exchanger two (8) in the electrolytic water purification system and the liquid discharge end of the heat exchanger one (3) are also connected to the water inlet end of the drain collector (18) through valve body five (15), valve body six (16) and valve body seven (17), respectively.

4. The PEM water electrolysis hydrogen production system according to any one of claims 1-3, characterized in that: The gas-liquid separator (14) is also connected to the valve body (2) by a hydrogen venting branch (20), and the end of the hydrogen venting branch (20) is connected to the hydrogen detection pipeline located at the end of the water electrolysis purification system.

5. The PEM water electrolysis hydrogen production system according to claim 4, characterized in that: The hydrogen venting branch (20) includes two valve bodies arranged in parallel, namely an electric control valve and a manual control valve.

6. The PEM water electrolysis hydrogen production system according to claim 3, characterized in that: Valve body two (2) and valve body three (5) are both pneumatic three-way valves, valve body one (21) is a pneumatic valve, and valve body five (15), valve body six (16), valve body seven (17) and valve body four (19) are all solenoid valves.

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