Electric hydrogen production and hydrogen compression multiplexing integrated system

Abstract

The invention discloses an electric hydrogen production and hydrogen compression multiplexing integrated system, and relates to the technical field of hydrogen energy. The problems that linkage of a water electrolysis hydrogen production system and a hydrogen compression system is insufficient, the equipment integration degree is insufficient, and economical efficiency is poor are solved. The system comprises a water source module, a water or low-pressure hydrogen pretreatment module, a reuse electrolytic bath, a low-pressure hydrogen storage module, a high-pressure hydrogen storage module and a power supply, the reuse electrolytic bath comprises an anode chamber and a cathode chamber which are separated by a proton exchange membrane; the anode chamber comprises a PEM anode chamber and an EHC anode chamber which are separated by an anode separation layer; an inlet of the water or low-pressure hydrogen pretreatment module is respectively communicated with outlets of the water source module and the low-pressure hydrogen storage module, and an outlet is selectively communicated with the PEM anode chamber or the EHC anode chamber; the cathode chamber is selectively communicated with the inlet of the high-pressure hydrogen storage module or the inlet of the low-pressure hydrogen storage module; the power supply can supply power to the multiplex electrolytic cell. The method is used for improving the hydrogen production performance.

Description

Technical Field

[0001] The present application relates to the field of hydrogen energy technology, and in particular to an integrated system for hydrogen production by electricity and hydrogen compression and reuse. Background Art

[0002] As a clean and efficient energy source, hydrogen energy plays an important role in energy transformation and carbon neutrality goals. At present, the overall technology of proton exchange membrane water electrolysis technology (PEM) is relatively mature, and commercialization is gradually being promoted. In addition, due to the properties of hydrogen itself, hydrogen needs to be pressurized for actual use. Electrochemical Hydrogen Compression (EHC) technology has the characteristics of low compression energy consumption, no moving equipment, and purification of gas impurities, and is currently attracting widespread attention.

[0003] Although the structures of the electrolyzers in the existing PEM water electrolysis hydrogen production system and the electrolyzers in the EHC electrochemical hydrogen compression technology are highly similar, the existing PEM water electrolysis hydrogen production system and EHC hydrogen compression system mostly use two completely independent systems, and the composition of each system is very complex. The linkage between the two systems is insufficient, and the equipment operation is cumbersome and inconvenient. Especially for the key components of the two systems, the electrolyzers, in order to realize the overall function, two different sets of electrolyzers need to be purchased, which is less economical and requires a high space for the equipment. Summary of the invention

[0004] The embodiments of the present application provide an integrated system for reuse of electric hydrogen production and hydrogen compression. By separating the anode chamber of the electrolyzer and sharing the cathode chamber, one electrolyzer can reuse two independent processes, namely, hydrogen production by electrolysis of water and electrochemical hydrogen compression. This solves the problems of insufficient linkage between the hydrogen production system by electrolysis of water and the hydrogen compression system, insufficient equipment integration, and poor economy.

[0005] To achieve the above-mentioned objectives, an embodiment of the present application provides an integrated system for hydrogen production by electricity and hydrogen compression reuse, comprising a water source module, a water or low-pressure hydrogen pretreatment module, a reused electrolyzer, a low-pressure hydrogen storage module, a high-pressure hydrogen storage module and a power supply; the reused electrolyzer comprises an anode chamber and a cathode chamber separated by a proton exchange membrane; the anode chamber comprises a PEM anode chamber and an EHC anode chamber separated by an anode separator layer; the inlet of the water or low-pressure hydrogen pretreatment module is respectively connected to the outlet of the water source module and the low-pressure hydrogen storage module, and the outlet can be selectively connected to the PEM anode chamber or the EHC anode chamber; the cathode chamber can be selectively connected to the inlet of the high-pressure hydrogen storage module or the inlet of the low-pressure hydrogen storage module; the power supply can supply power to the reused electrolyzer.

[0006] Furthermore, the anode separator layer is made of ceramic material.

[0007] Furthermore, the water or low-pressure hydrogen pretreatment module can be selectively connected to the PEM anode chamber or the EHC anode chamber through a first two-position three-way valve; the cathode chamber can be selectively connected to the inlet of the high-pressure hydrogen storage module or the inlet of the low-pressure hydrogen storage module through a second two-position three-way valve.

[0008] Furthermore, a gas-liquid separator is provided between the cathode chamber and the second two-position three-way valve.

[0009] Furthermore, the hydrogen outlet of the EHC anode chamber is connected to the low-pressure hydrogen storage module.

[0010] Furthermore, the water source module includes a water tank and a pump; the inlet of the pump is connected to the water tank, and the outlet is connected to the water or low-pressure hydrogen pretreatment module.

[0011] Furthermore, the water or low-pressure hydrogen pretreatment module includes a first filter and a first stop valve arranged at an outlet of the first filter.

[0012] Furthermore, the low-pressure hydrogen storage module includes a second filter, a second stop valve, a low-pressure hydrogen storage bottle and a flow control valve which are sequentially arranged along the flow direction of the gas.

[0013] Furthermore, the high-pressure hydrogen storage module includes a high-pressure hydrogen storage bottle; a flame arrester is provided at the inlet of the high-pressure hydrogen storage bottle.

[0014] Furthermore, the high-pressure hydrogen storage bottle is provided with a first state monitoring sensor; the low-pressure hydrogen storage bottle is provided with a second state monitoring sensor.

[0015] Compared with the prior art, this application has the following beneficial effects:

[0016] 1. The embodiment of the present application integrates the electrolytic cell for producing hydrogen by electrolysis of water with the electrolytic cell for electrochemical hydrogen compression, and realizes the reuse of hydrogen production and compression equipment by dividing the anode chamber and sharing the cathode chamber, thereby improving the integration of the equipment, reducing the complexity of the equipment, and reducing the production cost.

[0017] 2. The embodiment of the present application can freely choose to produce hydrogen or compress hydrogen according to actual production needs, and has the advantages of higher integration, simpler structure, high hydrogen purity, clean and low noise.

[0018] 3. The anode separator layer in the embodiment of the present application is made of a non-conductive ceramic material that does not participate in the electrolysis reaction of the system, and only plays a physical partition role and will not affect the hydrogen production or hydrogen compression effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the present application;

[0021] Figure 2 This is a schematic diagram of the reused electrolytic cell in an embodiment of the present application. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0024] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, they can understand the specific meanings of the above terms in this application according to specific circumstances.

[0025] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" can explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0026] Reference Figure 1 and Figure 2, an embodiment of the present application provides an integrated system for hydrogen production by electricity and hydrogen compression reuse, including a water source module, a water or low-pressure hydrogen pretreatment module, a reused electrolyzer 6, a low-pressure hydrogen storage module, a high-pressure hydrogen storage module and a power supply 17. The reused electrolyzer 6 includes an anode chamber and a cathode chamber separated by a proton exchange membrane. The anode chamber includes a PEM anode chamber and an EHC anode chamber separated by an anode separator layer. The inlet of the water or low-pressure hydrogen pretreatment module is respectively connected to the outlet of the water source module and the low-pressure hydrogen storage module, and the outlet can be selectively connected to the PEM anode chamber or the EHC anode chamber. The cathode chamber can be selectively connected to the inlet of the high-pressure hydrogen storage module or the inlet of the low-pressure hydrogen storage module. The power supply 17 can supply power to the reused electrolyzer 6.

[0027] Specifically, the water source module includes a water tank 1 and a pump 2. The water tank 1 is also provided with a water inlet, a drain outlet, and a drain and oxygen outlet. The inlet of the pump 2 is connected to the drain outlet of the water tank 1, and the outlet is connected to the inlet of the water or low-pressure hydrogen pretreatment module.

[0028] The water or low-pressure hydrogen pretreatment module includes a first filter 3 and a first stop valve 4. The inlet of the first filter 3 is connected to the outlet of the pump 2, and the outlet is connected to the inlet of the first stop valve 4. The first filter 3 is used to filter the fluid in the pipeline, and the first stop valve 4 is used to prevent the fluid in the pipeline from flowing back.

[0029] The water or low-pressure hydrogen pretreatment module can be selectively connected to the PEM anode chamber or the EHC anode chamber through the first two-position three-way valve 5. Specifically, the outlet of the first stop valve 4 is connected to the inlet of the first two-position three-way valve 5, and the two outlets of the first two-position three-way valve 5 are respectively connected to the PEM anode chamber or the EHC anode chamber of the reused electrolyzer 6. The first two-position three-way valve 5 is controlled to switch by the first controller 19.

[0030] Reference Figure 2 , the cathode chamber of the reused electrolyzer 6 is shared, and the anode chamber is divided into a PEM anode chamber and an EHC anode chamber by an anode separator. The PEM anode chamber electrolyzes water to produce hydrogen - water enters the anode side and electrolyzes O 2- and H + , O 2- Oxidation at the PEM anode electrode generates oxygen. + The proton exchange membrane is used to reduce and aggregate hydrogen at the cathode. The EHC anode chamber performs electrochemical hydrogen compression - low-pressure hydrogen enters the anode side and is oxidized to H at the EHC anode electrode. + , and then through the proton exchange membrane, it is reduced to high-pressure hydrogen at the cathode. In order to avoid mutual interference between the two different electrolysis chambers in the anode chamber, which may cause safety hazards and affect the purity of hydrogen, the two electrolysis chambers are separated by an anode separator. The anode separator is made of ceramic material, which is non-conductive and does not participate in the electrolysis reaction of the system. It only plays a physical partition role and will not affect the hydrogen production or hydrogen compression effect.

[0031] Continue to refer to Figure 1 The cathode chamber of the reused electrolytic cell 6 is connected to the inlet of the gas-liquid separator 7 , and a drain valve 18 is provided on the gas-liquid separator 7 . The water generated by the gas-liquid separator 7 is discharged through the drain outlet of the drain valve 18 .

[0032] The gas-liquid separator 7 can selectively communicate with the inlet of the high-pressure hydrogen storage module or the inlet of the low-pressure hydrogen storage module through the second two-position three-way valve 8. Specifically, the outlet of the gas-liquid separator 7 communicates with the inlet of the second two-position three-way valve 8, and the two outlets of the second two-position three-way valve 8 communicate with the inlet of the high-pressure hydrogen storage module or the inlet of the low-pressure hydrogen storage module respectively. The second two-position three-way valve 8 is controlled to switch by the second controller 20.

[0033] The high-pressure hydrogen storage module comprises a high-pressure hydrogen storage bottle 10, and a flame arrester 9 is provided at the inlet of the high-pressure hydrogen storage bottle 10. The high-pressure hydrogen storage bottle 10 is also provided with a first state monitoring sensor 11.

[0034] The low-pressure hydrogen storage module includes a second filter 12, a second stop valve 13, a low-pressure hydrogen storage bottle 15 and a flow control valve 16 which are sequentially arranged along the flow direction of the gas. The inlet of the second filter 12 is connected to one of the outlets of the second two-position three-way valve 8, and the outlet of the flow control valve 16 is connected to the inlet of the first filter 3. The second filter 12 is used to filter the fluid in the pipeline, the second stop valve 13 is used to prevent the fluid in the pipeline from flowing back, and the flow control valve 16 is used to control the flow of the fluid. A second state monitoring sensor 14 is also provided on the low-pressure hydrogen storage bottle 15.

[0035] In addition, in order to prevent the waste of hydrogen, the hydrogen outlet of the EHC anode chamber is connected to the inlet of the second filter 12, so that the low-pressure hydrogen generated by the EHC anode chamber can be compressed and reused. Similarly, in order to prevent the waste of water, the water and oxygen outlets of the PEM anode chamber are connected to the water tank 1 for recycling the generated water.

[0036] The working process of the embodiment of the present application is as follows:

[0037] 1. Hydrogen production process by water electrolysis:

[0038] After being driven by the pump 2, the water in the water tank 1 flows through the first filter 3 and the first stop valve 4 in sequence, and then enters the first two-position three-way valve 5. After the first controller 19 selects different valve paths according to the working state of the system, it enters the PEM anode chamber of the reused electrolyzer 6. The power supply 17 supplies power to electrolyze water to produce hydrogen. The low-pressure hydrogen produced in the cathode chamber of the reused electrolyzer 6 enters the gas-liquid separator 7. The water therein is discharged through the steam trap 18. The purified low-pressure hydrogen enters the second two-position three-way valve 8. After the second controller 20 controls the valve to select the path according to the working state of the system, the low-pressure hydrogen flows through the second filter 12 and the second stop valve 13 in sequence, and then enters the low-pressure hydrogen storage bottle 15 for storage. The second state monitoring sensor 14 monitors the state of the low-pressure hydrogen storage bottle 15 at all times to ensure its safety and reliability.

[0039] 2. Electrochemical hydrogen compression process:

[0040] The hydrogen in the low-pressure hydrogen storage bottle 15 passes through the flow control valve 16, flows through the first filter 3 and the first stop valve 4 in sequence, and then enters the first two-position three-way valve 5. The first controller 19 selects different valve paths according to the system working state and then enters the EHC anode chamber of the reused electrolyzer 6. The power supply 17 supplies power for electrochemical compression. The compressed high-pressure hydrogen generated in the cathode chamber of the reused electrolyzer 6 enters the gas-liquid separator 7. The moisture therein is discharged through the steam trap 18. The purified high-pressure hydrogen enters the second two-position three-way valve 8. The second controller 20 controls the valve to select the path according to the system working state, and then enters the high-pressure hydrogen storage bottle 10 through the flame arrester 9 for storage. The second state monitoring sensor 14 monitors the state of the high-pressure hydrogen storage bottle 10 at all times to ensure its safety and reliability.

[0041] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An integrated system for hydrogen production from electricity and hydrogen compression reuse, characterized in that: It includes a water source module, a water or low-pressure hydrogen pretreatment module, a reused electrolyzer, a low-pressure hydrogen storage module, a high-pressure hydrogen storage module and a power supply; the reused electrolyzer includes an anode chamber and a cathode chamber separated by a proton exchange membrane; the anode chamber includes a PEM anode chamber and an EHC anode chamber separated by an anode separator layer; the inlet of the water or low-pressure hydrogen pretreatment module is connected to the outlet of the water source module and the low-pressure hydrogen storage module respectively, and the outlet can be selectively connected to the PEM anode chamber or the EHC anode chamber; the cathode chamber can be selectively connected to the inlet of the high-pressure hydrogen storage module or the inlet of the low-pressure hydrogen storage module; the power supply can supply power to the reused electrolyzer.

2. The integrated system for hydrogen production by electricity and hydrogen compression and reuse according to claim 1 is characterized in that: The anode separator layer is made of ceramic material.

3. The integrated system for hydrogen production by electricity and hydrogen compression and reuse according to claim 1 is characterized in that: The water or low-pressure hydrogen pretreatment module can be selectively connected to the PEM anode chamber or the EHC anode chamber through a first two-position three-way valve; the cathode chamber can be selectively connected to the inlet of the high-pressure hydrogen storage module or the inlet of the low-pressure hydrogen storage module through a second two-position three-way valve.

4. The integrated system for hydrogen production by electricity and hydrogen compression and reuse according to claim 3 is characterized in that: A gas-liquid separator is also provided between the cathode chamber and the second two-position three-way valve.

5. The integrated system for hydrogen production by electricity and hydrogen compression and reuse according to claim 1 is characterized in that: The hydrogen outlet of the EHC anode chamber is connected to a low-pressure hydrogen storage module.

6. The integrated system for hydrogen production by electricity and hydrogen compression and reuse according to claim 1, characterized in that: The water source module comprises a water tank and a pump; the inlet of the pump is connected to the water tank, and the outlet of the pump is connected to the water or low-pressure hydrogen pretreatment module.

7. The integrated system for hydrogen production by electricity and hydrogen compression and reuse according to claim 1, characterized in that: The water or low-pressure hydrogen pretreatment module includes a first filter and a first stop valve arranged at an outlet of the first filter.

8. The integrated system for hydrogen production by electricity and hydrogen compression and reuse according to claim 1, characterized in that: The low-pressure hydrogen storage module comprises a second filter, a second stop valve, a low-pressure hydrogen storage bottle and a flow control valve which are sequentially arranged along the flow direction of the gas.

9. The integrated system for hydrogen production by electricity and hydrogen compression and reuse according to claim 8, characterized in that: The high-pressure hydrogen storage module comprises a high-pressure hydrogen storage bottle; a flame arrester is arranged at the inlet of the high-pressure hydrogen storage bottle.

10. The integrated system for hydrogen production by electricity and hydrogen compression and reuse according to claim 9, characterized in that: The high-pressure hydrogen storage bottle is provided with a first state monitoring sensor; the low-pressure hydrogen storage bottle is provided with a second state monitoring sensor.

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