Small device for producing hydrogen by electrolyzing alkaline water

By introducing a heat exchanger, pressure sensor, and control valve into the alkaline water electrolysis hydrogen production device, combined with a liquid supply mode switching valve group and an online gas phase detection system, the problem of difficult control of electrolysis parameters is solved, and precise adjustment of electrolyte state and efficient detection of gas purity are achieved. This method is suitable for alkaline water electrolysis hydrogen production experiments.

CN223674760UActive Publication Date: 2025-12-16JIANGYIN ANCAN ELECTROCHEM EQUIP
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Patent Information

Application Number
CN202423236896.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-27
Publication Date
2025-12-16
Estimated Expiration
2034-12-27

AI Technical Summary

Technical Problem

Existing alkaline water electrolysis hydrogen production devices struggle to achieve efficient online monitoring and control of parameters such as electrolysis temperature, pressure, flow rate, electrolyte gas content, and concentration, which affects voltage and gas purity.

Method used

A small-scale device for producing hydrogen by alkaline water electrolysis was designed, comprising an electrolyzer, cathode and anode outlet storage tanks, a gas-liquid separation bottle, and an online gas phase detection system. It is equipped with a heat exchanger, pressure sensor, and control valve. A liquid supply mode switching valve group is adopted to realize the switching between the separation and mixing liquid supply modes of the electrolyte. Combined with temperature, pressure, and flow rate controllers, the electrolysis process parameters can be monitored and controlled online.

Benefits of technology

It achieves precise control over the electrolyte state, reduces the gas content in the liquid, improves the real-time performance and accuracy of gas purity detection, has good flexibility, can simulate industrial operation, optimize electrolysis conditions, and ensure the accuracy of pressure balance and electrolyte concentration.

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Patent Text Reader

Abstract

The utility model discloses a small device for producing hydrogen by electrolyzing alkaline water. The small device comprises an electrolytic bath, a cathode outlet liquid storage tank, an anode outlet liquid storage tank, a cathode gas-liquid separation bottle, an anode gas-liquid separation bottle and an online gas phase detection system, a cathode gas separation pipeline is connected between the cathode outlet liquid storage tank and the top of the cathode gas-liquid separation bottle; a cathode outlet heat exchanger is arranged on the cathode gas separation pipeline; an anode gas separation pipeline is connected between the anode outlet liquid storage tank and the top of the anode gas-liquid separation bottle, and an anode outlet heat exchanger is arranged on the anode gas separation pipeline; a cathode gas discharge pipeline is arranged at the top of the cathode gas-liquid separation bottle, and an anode gas discharge pipeline is arranged at the top of the anode gas-liquid separation bottle; the on-line gas phase detection system comprises an on-line gas chromatograph used for connecting the cathode gas discharge pipeline and the anode gas discharge pipeline. According to the utility model, on-line monitoring and control of electrolysis process parameters in the alkaline water electrolysis hydrogen production experiment process are realized.
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Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of alkaline water electrolysis hydrogen production device, specifically relates to a kind of small device of alkaline water electrolysis hydrogen production. BACKGROUND

[0002] In the process of alkaline water electrolysis hydrogen production experiment, voltage and gas purity are the key of test data.In terms of materials, electrolytic cell structure, membrane material and electrode sheet material are the main factors affecting voltage and gas purity.In terms of electrolysis process, electrolysis temperature, pressure, flow rate, electrolyte gas content and electrolyte concentration are the main factors affecting voltage and gas purity.In order to more conveniently control electrolysis temperature, pressure, flow rate, electrolyte gas content and electrolyte concentration at the same time, it is necessary to improve the existing alkaline water electrolysis hydrogen production experiment device. SUMMARY

[0003] To solve the above problems, the utility model provides a kind of small device of alkaline water electrolysis hydrogen production, to realize the on-line monitoring and control of electrolysis process parameters in the process of alkaline water electrolysis hydrogen production.The specific technical scheme is as follows:

[0004] A kind of small device of alkaline water electrolysis hydrogen production, including electrolytic cell, cathode outlet storage tank, anode outlet storage tank, cathode gas-liquid separation bottle, anode gas-liquid separation bottle and on-line gas phase detection system;The cathode liquid outlet of the electrolytic cell is connected to the cathode outlet storage tank by pipeline, and the top of the cathode outlet storage tank and the cathode gas separation pipeline are connected, and the cathode outlet heat exchanger is arranged on the cathode gas separation pipeline;The anode liquid outlet of the electrolytic cell is connected to the anode outlet storage tank by pipeline, and the top of the anode outlet storage tank and the anode gas separation pipeline are connected, and the anode outlet heat exchanger is arranged on the anode gas separation pipeline;Cathode gas discharge pipeline is arranged at the top of the cathode gas-liquid separation bottle, and anode gas discharge pipeline is arranged at the top of the anode gas-liquid separation bottle;The on-line gas phase detection system includes on-line gas chromatograph for connecting the cathode gas discharge pipeline and anode gas discharge pipeline.

[0005] The cathode outlet heat exchanger and anode outlet heat exchanger are arranged, which can condense water in the gas into liquid and realize the drying of the gas.

[0006] Preferably, the cathode gas discharge pipeline is respectively provided with a cathode on-line gas pressure sensor and a cathode gas pressure control valve.

[0007] Preferably, the anode gas discharge pipeline is respectively provided with an anode on-line gas pressure sensor and an anode gas pressure control valve.

[0008] Preferably, the cathode gas-liquid separation bottle is provided with a cathode gas-liquid separation liquid level instrument, and the anode gas-liquid separation bottle is provided with an anode gas-liquid separation liquid level instrument.

[0009] In the utility model, the bottom of the cathode outlet liquid storage tank is connected with the cathode chamber liquid inlet of the electrolytic tank through a cathode electrolyte circulating liquid supply pipeline, and the cathode electrolyte circulating liquid supply pipeline is respectively provided with a cathode inlet heat exchanger and a cathode inlet high-precision piston pump.

[0010] In the utility model, the bottom of the cathode outlet liquid storage tank is connected with the cathode chamber liquid inlet of the electrolytic tank through a cathode electrolyte circulating liquid supply pipeline, and the cathode electrolyte circulating liquid supply pipeline is respectively provided with a cathode inlet heat exchanger and a cathode inlet high-precision piston pump.

[0011] As a further improvement of the utility model, the cathode electrolyte circulating liquid supply pipeline is further respectively provided with a cathode inlet temperature controller, a cathode inlet pressure controller and a cathode inlet flow rate controller.

[0012] In the utility model, the bottom of the cathode outlet liquid storage tank is connected with the cathode chamber liquid inlet of the electrolytic tank through a cathode electrolyte circulating liquid supply pipeline, and the cathode electrolyte circulating liquid supply pipeline is respectively provided with a cathode inlet heat exchanger and a cathode inlet high-precision piston pump.

[0013] Preferably, the cathode electrolyte circulating liquid supply pipeline is further respectively provided with a cathode inlet temperature controller, a cathode inlet pressure controller and a cathode inlet flow rate controller.

[0014] As a further improvement of the utility model, the cathode electrolyte circulating liquid supply pipeline is further respectively provided with a cathode inlet temperature controller, a cathode inlet pressure controller and a cathode inlet flow rate controller.

[0015] The utility model discloses a small -size device of alkaline water electrolysis hydrogen -producing, and the liquid storage tank and gas -liquid separation tank two devices are adopted, and it is favorable to further reduce the gas rate in liquid.

[0016] First, the small -size device of alkaline water electrolysis hydrogen -producing of the utility model adopts liquid storage tank and gas -liquid separation tank two devices, and it is favorable to further reduce the gas rate in liquid.

[0017] Second, the utility model discloses a small -size device of alkaline water electrolysis hydrogen -generating, adopts the gas purity of on -line gas chromatograph detection, and its detection real -time is good, and detection precision is high.

[0018] Third, the utility model discloses a small -size device of alkaline water electrolysis hydrogen -generating is provided with liquid supply mode switching valve group, and its through two three -way valves and the special connection structure of a partition valve, formed the switching of electrolyte separation liquid supply mode and electrolyte mixed liquid supply mode, and its flexibility is good, and liquid supply mode switching valve group can adjust solution separation or mixing at any time, can test the air separation performance of membrane through separation system, and can also utilize mixed system simulation industrialization operation.

[0019] Fourth, the utility model discloses a small -size device of alkaline water electrolysis hydrogen -generating is installed temperature sensor, pressure controller and flow rate controller on cathode electrolyte circulation liquid supply pipeline and anode electrolyte circulation liquid supply pipeline, can effectively control the state of electrolyte into electrolytic cell, realizes the optimization of electrolytic working condition.

[0020] Fifth, the utility model discloses a small -size device of alkaline water electrolysis hydrogen -generating is provided with pressure control valve on cathode gas discharge pipeline and cathode gas discharge pipeline respectively. Through the control of pressure control valve, can make the pressure of cathode side and anode side almost same, realizes pressure balance.

[0021] Sixth, the utility model discloses a small -size device of alkaline water electrolysis hydrogen -generating is provided with gas -liquid separation liquid level instrument on cathode gas -liquid separation bottle and anode gas -liquid separation bottle respectively, and through liquid level instrument control electrolyte concentration, is more accurate. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the structure schematic diagram of a small -size device of alkaline water electrolysis hydrogen -generating of the utility model.

[0023] In the drawing: 1-cathode gas pressure control valve, 2-anode gas pressure control valve, 3-cathode on -line gas pressure sensor, 4-anode on -line gas pressure sensor, 5-cathode outlet heat exchanger, 6-anode outlet heat exchanger, 7-cathode outlet liquid storage tank, 8-anode outlet liquid storage tank, 9-cathode gas -liquid separation bottle, 10-anode gas -liquid separation bottle, 11-cathode gas -liquid separation liquid level instrument, 12-anode gas -liquid separation liquid level instrument, 13-liquid level balance high -precision piston pump, 14-cathode import temperature controller, 15-anode import temperature controller, 16-cathode import flow rate controller, 17-anode import flow rate controller, 18-cathode import pressure controller, 19-anode import pressure controller, 20-cathode import heat exchanger, 21-anode import heat exchanger, 22-cathode import high -precision piston pump, 23-anode import high -precision piston pump, 24, 25-three -way valve, 26-partition valve. DETAILED DESCRIPTION

[0024] The specific embodiments of the utility model will be further described below in combination with the drawings and examples. The following examples are only used to more clearly illustrate the technical scheme of the utility model, and cannot be used to limit the protection scope of the utility model. Example 1

[0025] As Figure 1 It is an embodiment of a small device for alkaline water electrolysis hydrogen production of the utility model, including electrolytic cell, cathode outlet storage tank 7, anode outlet storage tank 8, cathode gas-liquid separation bottle 9, anode gas-liquid separation bottle 10 and online gas phase detection system;The cathode liquid outlet of electrolytic cell is connected to the cathode outlet storage tank 7 by pipeline, and the cathode outlet storage tank 7 is connected with the top of the cathode gas-liquid separation bottle 9 between the cathode gas separation pipeline, the cathode gas separation pipeline is provided with cathode outlet heat exchanger 5;The anode liquid outlet of electrolytic cell is connected to the anode outlet storage tank 8 by pipeline, and the anode outlet storage tank 8 is connected with the top of the anode gas-liquid separation bottle 10 between the anode gas separation pipeline, the anode gas separation pipeline is provided with anode outlet heat exchanger 6;The top of the cathode gas-liquid separation bottle 9 is provided with cathode gas discharge pipeline, and the top of the anode gas-liquid separation bottle 10 is provided with anode gas discharge pipeline;The online gas phase detection system includes online gas chromatograph for connecting the cathode gas discharge pipeline and anode gas discharge pipeline.

[0026] The cathode outlet heat exchanger 5 and anode outlet heat exchanger 6 described above can condense water in gas into liquid, realizing the drying of gas.

[0027] Preferably, the cathode gas discharge pipeline is respectively provided with cathode online gas pressure sensor 3 and cathode gas pressure control valve 1.

[0028] Preferably, the anode gas discharge pipeline is respectively provided with anode online gas pressure sensor 4 and anode gas pressure control valve 2.

[0029] Preferably, the cathode gas-liquid separation bottle 9 is provided with cathode gas-liquid separation liquid level instrument 11, and the anode gas-liquid separation bottle 10 is provided with anode gas-liquid separation liquid level instrument 12.

[0030] In the embodiment, the bottom of the cathode outlet storage tank 7 and the bottom of the cathode gas-liquid separation bottle 9 are provided with a cathode liquid communication pipe, and the bottom of the anode outlet storage tank 8 and the bottom of the anode gas-liquid separation bottle 10 are provided with an anode liquid communication pipe;The bottom of the cathode outlet storage tank 7 is also connected with a liquid level balance high-precision piston pump 13 by pipeline.

[0031] In this embodiment, a cathode electrolyte circulation supply pipeline is connected between the bottom of the cathode outlet storage tank 7 and the cathode chamber liquid inlet of the electrolytic cell, and a cathode inlet heat exchanger 20 and a cathode inlet high-precision piston pump 22 are respectively arranged on the cathode electrolyte circulation supply pipeline.

[0032] As a further improvement of this embodiment, a cathode inlet temperature controller 14, a cathode inlet pressure controller 18 and a cathode inlet flow rate controller 16 are respectively arranged on the cathode electrolyte circulation supply pipeline.

[0033] In this embodiment, an anode electrolyte circulation supply pipeline is connected between the bottom of the anode outlet storage tank 8 and the anode chamber liquid inlet of the electrolytic cell, and an anode inlet heat exchanger 21 and an anode inlet high-precision piston pump 23 are respectively arranged on the anode electrolyte circulation supply pipeline.

[0034] Preferably, an anode inlet temperature controller 15, an anode inlet pressure controller 19 and an anode inlet flow rate controller 17 are respectively arranged on the anode electrolyte circulation supply pipeline.

[0035] As a further improvement of this embodiment, a supply mode switching valve group for switching between electrolyte separate supply mode and electrolyte mixed supply mode is arranged between the cathode electrolyte circulation supply pipeline and the anode electrolyte circulation supply pipeline, and the supply mode switching valve group includes a cutoff valve 26 and a pair of three-way valves 24 and 25. The cutoff valve 26 is connected in series on the cathode electrolyte circulation supply pipeline, both of the two through ports of the pair of three-way valves 24 and 25 are connected in series on the anode electrolyte circulation supply pipeline, and the third through port of the pair of three-way valves is connected to the cathode electrolyte circulation supply pipeline and is arranged on the two sides of the cutoff valve 26. Embodiment 2:

[0036] The working process and principle of a small-scale alkaline water electrolysis hydrogen production device of embodiment 1 are as follows:

[0037] The electrolysis system mainly includes an electrolytic cell, a liquid storage tank, a gas-liquid separation bottle, an online gas phase detection system and a related control system.

[0038] 30% KOH solution as electrolyte into the anode and cathode chamber, in the cathode electrolysis generated hydrogen, electrolyte and hydrogen gas flow into the cathode outlet storage tank 7, hydrogen containing moisture by the cathode outlet heat exchanger 5 condensation and be removed, the cathode gas pressure control valve 1 for controlling the gas pressure and through the cathode on-line gas pressure sensor 3 on the display pressure;In the anode electrolysis generated oxygen, electrolyte and oxygen gas flow into the anode outlet storage tank 8, oxygen containing moisture by the anode outlet heat exchanger 6 condensation and be removed, the anode gas pressure control valve 2 for controlling the gas pressure and through the cathode on-line gas pressure sensor 4 on the display pressure. The hydrogen and oxygen gas produced can be directly analyzed by on-line gas chromatograph, obtain gas purity data. After electrolysis, electrolyte is recycled into the anode and cathode chamber in two modes of separation or mixing. In the separation mode, the three-way valve 24, 25 and the isolation valve 26 are adjusted to separate the anode and cathode electrolyte, the cathode electrolyte is recycled into the cathode chamber by the cathode inlet high-precision piston pump 22 to control the flow, the cathode inlet pressure controller 18 controls the pressure, and the cathode inlet temperature controller 14 controls the temperature, the anode electrolyte is recycled into the anode chamber by the anode inlet high-precision piston pump 23 to control the flow, the anode inlet pressure controller 19 controls the pressure, and the anode inlet temperature controller 15 controls the temperature, in this mode, the anode and cathode electrolyte are independently circulated, the trace hydrogen and oxygen in the electrolyte will not be mixed, and the purity of the gas will be higher, but the concentration of the cathode chamber will continue to rise, and the concentration of the anode chamber will decrease;In the mixing mode, the three-way valve 24, 25 and the isolation valve 26 are adjusted, the anode and cathode electrolyte is mixed, the electrolyte is recycled into the anode chamber by the anode inlet high-precision piston pump 23 to control the flow, the anode inlet pressure controller 19 controls the pressure, and the anode inlet temperature controller 15 controls the temperature, the electrolyte is recycled into the cathode chamber by the cathode inlet high-precision piston pump 22 to control the flow, the cathode inlet pressure controller 18 controls the pressure, and the cathode inlet temperature controller 14 controls the temperature, in this mode, the concentration of the anode and cathode chamber will be maintained constant, but due to the mixing of the anode and cathode electrolyte, the trace oxygen and hydrogen in the electrolyte are mixed, which slightly reduces the purity of hydrogen and oxygen. In the mixing mode, the volume of the electrolyte is observed by the cathode gas-liquid separation liquid level instrument 11, and the KOH concentration is controlled in real time by the liquid level balance high-precision piston pump 13. The mixed circulation mode is closer to industrial production.

[0039] The above only describes the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and refinements can be made, which should also be considered as the protection scope of the present application.

Claims

1. A small device for hydrogen production by alkaline water electrolysis, characterized in that, The application relates to an electrolytic tank, a cathode outlet storage tank, an anode outlet storage tank, a cathode gas-liquid separation bottle, an anode gas-liquid separation bottle and an online gas phase detection system; a cathode liquid outlet of the electrolytic tank is connected to the cathode outlet storage tank through a pipeline, a cathode gas separation pipeline is connected between the cathode outlet storage tank and the top of the cathode gas-liquid separation bottle, and a cathode outlet heat exchanger is arranged on the cathode gas separation pipeline; an anode liquid outlet of the electrolytic tank is connected to the anode outlet storage tank through a pipeline, an anode gas separation pipeline is connected between the anode outlet storage tank and the top of the anode gas-liquid separation bottle, and an anode outlet heat exchanger is arranged on the anode gas separation pipeline; a cathode gas discharge pipeline is arranged at the top of the cathode gas-liquid separation bottle, and an anode gas discharge pipeline is arranged at the top of the anode gas-liquid separation bottle; the online gas phase detection system comprises an online gas chromatograph for connecting the cathode gas discharge pipeline and the anode gas discharge pipeline.

2. A small-sized device for hydrogen production by alkaline water electrolysis according to claim 1, characterized in that, A cathode online gas pressure sensor and a cathode gas pressure control valve are arranged on the cathode gas discharge pipeline.

3. A small-sized device for hydrogen production by alkaline water electrolysis according to claim 1, characterized in that, An anode online gas pressure sensor and an anode gas pressure control valve are arranged on the anode gas discharge pipeline.

4. The small-sized device for hydrogen production by alkaline water electrolysis according to claim 1, characterized by A cathode gas-liquid separation liquid level instrument is arranged on the cathode gas-liquid separation bottle, and an anode gas-liquid separation liquid level instrument is arranged on the anode gas-liquid separation bottle.

5. The small-sized device for hydrogen production by alkaline water electrolysis according to claim 1, characterized by the fact that A cathode liquid communication pipe is arranged between the bottom of the cathode outlet storage tank and the bottom of the cathode gas-liquid separation bottle, and an anode liquid communication pipe is arranged between the bottom of the anode outlet storage tank and the bottom of the anode gas-liquid separation bottle; a liquid level balance high-precision piston pump is further connected to the bottom of the cathode outlet storage tank through a pipeline.

6. The small-sized device for hydrogen production by alkaline water electrolysis according to claim 1, characterized by the fact that A cathode electrolyte circulating liquid supply pipeline is connected between the bottom of the cathode outlet storage tank and the cathode chamber liquid inlet of the electrolytic tank, and a cathode inlet heat exchanger and a cathode inlet high-precision piston pump are arranged on the cathode electrolyte circulating liquid supply pipeline.

7. A small device for hydrogen production by alkaline water electrolysis according to claim 6, characterized in that, A cathode inlet temperature controller, a cathode inlet pressure controller and a cathode inlet flow rate controller are further arranged on the cathode electrolyte circulating liquid supply pipeline.

8. A small-sized device for hydrogen production by alkaline water electrolysis according to claim 6, characterized in that, An anode electrolyte circulating liquid supply pipeline is connected between the bottom of the anode outlet storage tank and the anode chamber liquid inlet of the electrolytic tank, and an anode inlet heat exchanger and an anode inlet high-precision piston pump are arranged on the anode electrolyte circulating liquid supply pipeline.

9. A small-sized device for hydrogen production by alkaline water electrolysis according to claim 8, characterized in that, An anode inlet temperature controller, an anode inlet pressure controller and an anode inlet flow rate controller are further arranged on the anode electrolyte circulating liquid supply pipeline.

10. The small-sized device for hydrogen production by alkaline water electrolysis according to claim 8, characterized by A liquid supply mode switching valve group for realizing electrolyte separation liquid supply mode and electrolyte mixing liquid supply mode switching is further arranged between the cathode electrolyte circulating liquid supply pipeline and the anode electrolyte circulating liquid supply pipeline, the liquid supply mode switching valve group comprises a cutoff valve and a pair of three-way valves, the cutoff valve is connected in series on the cathode electrolyte circulating liquid supply pipeline, two through openings of the pair of three-way valves are connected in series on the anode electrolyte circulating liquid supply pipeline, and the third through opening of the pair of three-way valves is connected to the cathode electrolyte circulating liquid supply pipeline and is arranged on the two sides of the cutoff valve.