Hydrogen and oxygen exhaust system of alkaline water electrolyser capable of being used at constant pressure

Abstract

The utility model relates to a hydrogen-oxygen exhaust system of an alkaline water electrolytic bath capable of being used at constant pressure, which comprises an electrolytic bath and a constant-pressure adjusting system, and the constant-pressure adjusting system comprises a hydrogen pressure supplementing pipeline and an oxygen pressure supplementing pipeline; a hydrogen pipeline for exhausting hydrogen is arranged at the upper part of the hydrogen cooling separator, and an oxygen pipeline for exhausting oxygen is arranged at the upper part of the oxygen cooling separator; the hydrogen pipeline between the hydrogen exhaust control valve and the hydrogen cooling separator is provided with a branch: a hydrogen pressure supplementing pipeline, the hydrogen pressure supplementing pipeline is provided with a hydrogen constant pressure regulating valve, and the hydrogen pressure supplementing pipeline is connected with an external hydrogen source; a branch, namely an oxygen pressure supplementing pipeline is arranged on the oxygen pipeline between the oxygen exhaust control valve and the oxygen cooling separator, an oxygen constant-pressure regulating valve is arranged on the oxygen pressure supplementing pipeline, and the oxygen pressure supplementing pipeline is connected with an external oxygen source. The electrolytic bath can operate safely and stably for a long time, and the service life of the electrolytic bath is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen production by electrolysis of water, in particular to a hydrogen and oxygen exhaust system of an alkaline water electrolyzer which can be used at a constant pressure. Background Art

[0002] Alkaline water electrolysis is the only technology that can achieve large-scale, long-term renewable energy power storage. Alkaline water electrolysis is a mature technical means. However, the current alkaline water electrolysis hydrogen production equipment, especially the use scenarios of green electricity hydrogen production such as photovoltaic and wind power generation, due to the characteristics of green electricity load fluctuations, the electrolyzer is in a large range of load fluctuations, and the frequent start-stop during the day and shut down at night are unstable. The frequent start-stop causes the pressure of the electrolyzer itself to change greatly, making the electrolyzer easily damaged by the alternating pressure, causing the alkaline solution to flow out, and the electrolyzer to be scrapped. Problems such as the phenomenon seriously affect the safety and service life of the electrolyzer.

[0003] Therefore, in view of the above existing problems, there is an urgent need for a hydrogen and oxygen exhaust system for an alkaline water electrolyzer that can be used at a constant pressure. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide a hydrogen and oxygen exhaust system for an alkaline water electrolyzer that can be used at a constant pressure, thereby eliminating the damage to the gasket caused by pressure alternation caused by frequent start-up and shutdown of the electrolyzer, thereby avoiding the electrolyzer being scrapped due to gasket damage and reducing maintenance costs.

[0005] The purpose of the utility model is achieved in this way:

[0006] A hydrogen and oxygen exhaust system of an alkaline water electrolyzer that can be used at a constant pressure, comprising an electrolyzer and a constant pressure regulating system, wherein the constant pressure regulating system comprises a hydrogen pressure-compensating pipeline and an oxygen pressure-compensating pipeline; the electrolyzer is connected to an alkaline liquid cooler through an alkaline liquid circulation pump, the electrolyzer is respectively connected to a hydrogen separator and an oxygen separator, and liquid outlets of the oxygen separator and the hydrogen separator are both connected to the alkaline liquid cooler;

[0007] The gas outlet of the hydrogen separator is connected to the hydrogen scrubber, the gas outlet of the oxygen separator is connected to the oxygen scrubber, the liquid inlets of the hydrogen scrubber and the oxygen scrubber are connected to raw water, the hydrogen scrubber is connected to the hydrogen cooling separator, and the oxygen scrubber is connected to the oxygen cooling separator;

[0008] A hydrogen pipeline for hydrogen exhaust is provided on the upper part of the hydrogen cooling separator, and an oxygen pipeline for oxygen exhaust is provided on the upper part of the oxygen cooling separator; a branch is provided on the hydrogen pipeline between the hydrogen exhaust control valve and the hydrogen cooling separator: a hydrogen pressure-compensating pipeline, a hydrogen constant-pressure regulating valve is provided on the hydrogen pressure-compensating pipeline, and the hydrogen pressure-compensating pipeline is connected to an external hydrogen source; a branch is provided on the oxygen pipeline between the oxygen exhaust control valve and the oxygen cooling separator: an oxygen pressure-compensating pipeline, an oxygen constant-pressure regulating valve is provided on the oxygen pressure-compensating pipeline, and the oxygen pressure-compensating pipeline is connected to an external oxygen source.

[0009] Furthermore, the alkali liquid cooler is provided with a circulating cooling water supply pipeline and a circulating cooling water return pipeline.

[0010] Furthermore, one side of the hydrogen cooling separator and the oxygen cooling separator are respectively connected to a chilled water supply pipeline, and the other side of the hydrogen cooling separator and the oxygen cooling separator are respectively connected to a chilled water return pipeline.

[0011] Furthermore, a hydrogen exhaust control valve is provided on the hydrogen pipeline; and a water outlet is provided at the bottom of the hydrogen cooling separator.

[0012] Furthermore, an oxygen exhaust control valve is provided on the oxygen pipeline, and a water outlet is provided at the bottom of the oxygen cooling separator.

[0013] Furthermore, a hydrogen compressor is provided on the hydrogen pressure replenishing pipeline, and the hydrogen compressor is arranged on the pipeline between the hydrogen constant pressure regulating valve and the external hydrogen source.

[0014] Furthermore, an oxygen compressor is provided on the oxygen pressure replenishing pipeline, and the oxygen compressor is arranged on the pipeline between the oxygen constant pressure regulating valve and the external oxygen source.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model provides a hydrogen and oxygen exhaust system of an alkaline water electrolyzer which can be used at a constant pressure. A pressure-compensating pipeline system connected to an external hydrogen source is added to a hydrogen pipeline in front of a hydrogen exhaust control valve, and a hydrogen constant-pressure regulating valve is arranged on the pressure-compensating pipeline system; a pressure-compensating pipeline system connected to an external oxygen source is added to an oxygen pipeline in front of an oxygen exhaust control valve, and an oxygen constant-pressure regulating valve is arranged on the pressure-compensating pipeline system; when the electrolyzer is shut down, the hydrogen exhaust control valve and the oxygen exhaust control valve are closed, and the hydrogen constant-pressure regulating valve and the oxygen constant-pressure regulating valve of the pressure-compensating pipeline use an external gas source to adjust and control the pressures on the hydrogen and oxygen sides of the electrolyzer, so as to keep the pressures on the hydrogen and oxygen sides consistent with the working pressure when the electrolyzer is in operation, eliminate the problem of pressure alternation caused by frequent start-up and shutdown of the electrolyzer, and the electrolyzer gasket is not affected by pressure alternation, so that the electrolyzer can operate safely and stably for a long time, and the service life of the electrolyzer is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of Example 1 of the utility model.

[0018] Figure 2 This is a schematic structural diagram of Example 2 of the present utility model.

[0019] in:

[0020] Electrolyzer 1, alkali liquid cooler 2, alkali liquid circulation pump 3, hydrogen separator 4, hydrogen scrubber 5, oxygen separator 6, oxygen scrubber 7, hydrogen cooling separator 8, hydrogen exhaust control valve 8.1, oxygen cooling separator 9, oxygen exhaust control valve 9.1, hydrogen pressure replenishing pipeline 10, hydrogen constant pressure regulating valve 10.1, hydrogen compressor 10.2, oxygen pressure replenishing pipeline 11, oxygen constant pressure regulating valve 11.1, oxygen compressor 11.2. DETAILED DESCRIPTION

[0021] In order to better understand the technical solution of the present invention, the following will be described in detail in conjunction with the relevant illustrations. It should be understood that the following specific embodiments are not intended to limit the specific implementation of the technical solution of the present invention, and are only implementations that can be adopted by the technical solution of the present invention. It should be noted that the description of the positional relationship of each component in this article, such as component A being located above component B, is based on the description of the relative positions of the components in the illustration, and is not intended to limit the actual positional relationship of the components. Embodiment 1:

[0022] See also Figure 1 , Figure 1 A hydrogen and oxygen exhaust system of an alkaline water electrolyzer that can be used at a constant pressure in Example 1 is drawn. As shown in the figure, a hydrogen and oxygen exhaust system of an alkaline water electrolyzer that can be used at a constant pressure in Example 1 includes an electrolyzer 1 and a constant pressure regulating system, wherein the constant pressure regulating system includes a hydrogen pressure compensating pipeline 10 and an oxygen pressure compensating pipeline 11;

[0023] The electrolytic cell 1 is connected to the alkali liquid cooler 2 via an alkali liquid circulation pump 3, and the alkali liquid cooler 2 is provided with a circulating cooling water supply pipeline and a circulating cooling water return pipeline; the electrolytic cell 1 is respectively connected to the hydrogen separator 4 and the oxygen separator 6, and the liquid outlets of the oxygen separator 6 and the hydrogen separator 4 are both connected to the alkali liquid cooler 2;

[0024] The gas outlet of the hydrogen separator 4 is connected to the hydrogen scrubber 5, the gas outlet of the oxygen separator 6 is connected to the oxygen scrubber 7, the liquid inlets of the hydrogen scrubber 5 and the oxygen scrubber 7 are connected to raw water, the hydrogen scrubber 5 is connected to the hydrogen cooling separator 8, and the oxygen scrubber 7 is connected to the oxygen cooling separator 9.

[0025] A hydrogen pipeline for hydrogen exhaust is provided at the upper part of the hydrogen cooling separator 8, a hydrogen exhaust control valve 8.1 is provided on the hydrogen pipeline, and a water outlet is provided at the bottom of the hydrogen cooling separator 8; an oxygen pipeline for oxygen exhaust is provided at the upper part of the oxygen cooling separator 9, an oxygen exhaust control valve 9.1 is provided on the oxygen pipeline, and a water outlet is provided at the bottom of the oxygen cooling separator 9;

[0026] One side of the hydrogen cooling separator 8 and the oxygen cooling separator 9 is connected to a chilled water supply pipeline, and the other side of the hydrogen cooling separator 8 and the oxygen cooling separator 9 is connected to a chilled water return pipeline.

[0027] A branch is provided on the hydrogen pipeline between the hydrogen exhaust control valve 8.1 and the hydrogen cooling separator 8: a hydrogen pressure-compensating pipeline 10, on which a hydrogen constant pressure regulating valve 10.1 is provided, and the hydrogen pressure-compensating pipeline 10 is connected to an external hydrogen source;

[0028] A branch is provided on the oxygen pipeline between the oxygen exhaust control valve 9.1 and the oxygen cooling separator 9: an oxygen pressure-compensating pipeline 11, on which an oxygen constant-pressure regulating valve 11.1 is provided, and the oxygen pressure-compensating pipeline 11 is connected to an external oxygen source.

[0029] The external oxygen source can be supplied with oxygen or nitrogen.

[0030] When the electrolyzer is shut down, the hydrogen exhaust control valve and the oxygen exhaust control valve are closed, and the hydrogen constant pressure regulating valve and the oxygen constant pressure regulating valve of the pressure replenishing pipeline use an external gas source to adjust and control the pressure on the hydrogen and oxygen sides of the electrolyzer to keep the pressure on the hydrogen and oxygen sides consistent with the working pressure when the electrolyzer is in operation.

[0031] The hydrogen constant pressure regulating valve 10.1 and the oxygen constant pressure regulating valve 11.1 are connected to a control system, and the control system takes the operating condition pressure in the electrolyzer as a target input to keep the pressure in the electrolyzer the same as the operating condition. Embodiment 2:

[0032] See also Figure 2 , Figure 2 A hydrogen and oxygen exhaust system of an alkaline water electrolyzer that can be used at a constant pressure in Example 2 is drawn. As shown in the figure, the hydrogen and oxygen exhaust system of an alkaline water electrolyzer that can be used at a constant pressure in Example 2 is different from that in Example 1 in that a hydrogen compressor 10.2 is provided on the hydrogen pressure replenishing pipeline 10, and an oxygen compressor 11.2 is provided on the oxygen pressure replenishing pipeline 11;

[0033] The hydrogen compressor 10.2 is arranged on the pipeline between the hydrogen constant pressure regulating valve 10.1 and the external hydrogen source, that is, the hydrogen compressor 10.2 is arranged on the pipeline before the hydrogen constant pressure regulating valve of the external hydrogen source pressure replenishing pipeline system; the oxygen compressor 11.2 is arranged on the pipeline between the oxygen constant pressure regulating valve 11.1 and the external oxygen source, that is, the oxygen compressor 11.2 is arranged on the pipeline before the oxygen constant pressure regulating valve of the external oxygen source pipeline system.

[0034] When the pressure of the external hydrogen source and the external oxygen source is insufficient, the hydrogen compressor and the oxygen compressor can be started to increase the pressure to ensure that the pressure of the electrolyzer is consistent with the working pressure during operation.

[0035] The above are only specific application examples of the utility model, and do not constitute any limitation on the protection scope of the utility model. Any technical solution formed by equivalent transformation or equivalent replacement falls within the protection scope of the utility model.

Claims

1. A hydrogen and oxygen exhaust system for an alkaline water electrolyzer capable of being used at a constant pressure, characterized in that: It comprises an electrolytic cell (1) and a constant pressure regulating system, wherein the constant pressure regulating system comprises a hydrogen pressure compensating pipeline (10) and an oxygen pressure compensating pipeline (11); the electrolytic cell (1) is connected to an alkali liquid cooler (2) via an alkali liquid circulation pump (3); the electrolytic cell (1) is respectively connected to a hydrogen separator (4) and an oxygen separator (6); liquid outlets of the oxygen separator (6) and the hydrogen separator (4) are both connected to the alkali liquid cooler (2); The gas outlet of the hydrogen separator (4) is connected to the hydrogen scrubber (5), the gas outlet of the oxygen separator (6) is connected to the oxygen scrubber (7), the liquid inlets of the hydrogen scrubber (5) and the oxygen scrubber (7) are connected to raw water, the hydrogen scrubber (5) is connected to the hydrogen cooling separator (8), and the oxygen scrubber (7) is connected to the oxygen cooling separator (9); A hydrogen pipeline for exhausting hydrogen is provided at the upper part of the hydrogen cooling separator (8), and an oxygen pipeline for exhausting oxygen is provided at the upper part of the oxygen cooling separator (9); a hydrogen exhaust control valve (8.1) is provided on the hydrogen pipeline; a water outlet is provided at the bottom of the hydrogen cooling separator (8); and an oxygen exhaust control valve ( 9.1), a water outlet is provided at the bottom of the oxygen cooling separator (9); A branch is provided on the hydrogen pipeline between the hydrogen exhaust control valve (8.1) and the hydrogen cooling separator (8): a hydrogen pressure-compensating pipeline (10), on which a hydrogen constant-pressure regulating valve (10.1) is provided, and the hydrogen pressure-compensating pipeline (10) is connected to an external hydrogen source; a branch is provided on the oxygen pipeline between the oxygen exhaust control valve (9.1) and the oxygen cooling separator (9): an oxygen pressure-compensating pipeline (11), on which an oxygen constant-pressure regulating valve (11.1) is provided, and the oxygen pressure-compensating pipeline (11) is connected to an external oxygen source.

2. The hydrogen and oxygen exhaust system of an alkaline water electrolyzer capable of being used at a constant pressure according to claim 1, characterized in that: The alkali liquid cooler (2) is provided with a circulating cooling water supply pipeline and a circulating cooling water return pipeline.

3. The hydrogen and oxygen exhaust system of an alkaline water electrolyzer capable of being used at a constant pressure according to claim 1, characterized in that: One side of the hydrogen cooling separator (8) and the oxygen cooling separator (9) are respectively connected to a chilled water supply pipeline, and the other side of the hydrogen cooling separator (8) and the oxygen cooling separator (9) are respectively connected to a chilled water return pipeline.

4. The hydrogen and oxygen exhaust system of an alkaline water electrolyzer capable of being used at a constant pressure according to claim 1, characterized in that: A hydrogen compressor (10.2) is provided on the hydrogen pressure replenishing pipeline (10); the hydrogen compressor (10.2) is arranged on the pipeline between the hydrogen constant pressure regulating valve (10.1) and the external hydrogen source.

5. The hydrogen and oxygen exhaust system of an alkaline water electrolyzer capable of being used at a constant pressure according to claim 1, characterized in that: An oxygen compressor (11.2) is provided on the oxygen pressure replenishment pipeline (11); the oxygen compressor (11.2) is arranged on the pipeline between the oxygen constant pressure regulating valve (11.1) and the external oxygen source.

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