WO2023045435A1 - Differential pressure adjusting device for electrolytic hydrogen production system, and electrolytic hydrogen production system - Google Patents

Abstract

The present application provides a differential pressure adjusting device for an electrolytic hydrogen production system, and the electrolytic hydrogen production system. The differential pressure adjusting device comprises an oxygen side separator, a hydrogen side separator, and a pipeline which enables the oxygen side separator and the hydrogen side separator to be communicated; and a movable member for adjusting the differential pressure of the two sides, the oxygen side separator and the hydrogen side separator, is provided in the pipeline. According to the present application, the differential pressure serves as a driving force to drive the movable member to adjust the differential pressure of the two sides, hydrogen and oxygen; extra energy output is not required; energy and manpower consumption are avoided; potential safety hazards caused by the differential pressure of the two sides, hydrogen and oxygen, are eliminated; the differential pressure of the two sides, hydrogen and oxygen, can be adjusted in real time; the flexibility is high; no pollution and carbon emission is generated; safety guarantee is provided for development of the national hydrogen energy industry, and support is provided for implementation of national carbon neutralization when carbon reaches the peak.

Description

Pressure difference adjustment device and electrolytic hydrogen production system of an electrolytic hydrogen production system

This application claims the priority of the Chinese patent application submitted to the China Patent Office on September 23, 2021, the application number is 202111115870.X, and the invention title is "a pressure difference adjustment device for an electrolytic hydrogen production system and an electrolytic hydrogen production system" , the entire contents of which are incorporated in this application by reference.

technical field

The present application relates to the technical field of electrolytic hydrogen production, and in particular to a pressure difference regulating device of an electrolytic hydrogen production system and an electrolytic hydrogen production system.

Background technique

At present, the mainstream industrial water electrolysis hydrogen production equipment is an alkaline water electrolyzer. Under the blessing of direct current, the water in the electrolyzer will be decomposed into 1 part of hydrogen and 1/2 part of oxygen at the cathode and anode respectively. The ideal water electrolysis hydrogen production process is that the electrolyzer is full of lye, and the pressure on the hydrogen side and the oxygen side in the electrolyzer should be equal. However, in the actual production process of water electrolysis, since the amount of hydrogen and oxygen produced by water decomposition satisfies the 2:1 relationship, there will be a pressure difference on both sides of hydrogen and oxygen. Driven by the pressure difference, hydrogen and oxygen can easily pass through the diaphragm and interact with each other. Mixing will lead to the decrease of gas purity and even the occurrence of vicious accidents such as explosions.

Contents of the invention

This application aims to solve one of the technical problems in the related art at least to a certain extent.

Therefore, the purpose of this application is to propose a pressure difference regulating device for an electrolytic hydrogen production system. This application uses the pressure difference as the driving force to drive the movable parts to adjust the pressure difference on both sides of hydrogen and oxygen, which does not require additional energy output, avoids energy consumption and manpower, and eliminates potential safety hazards caused by the pressure difference on both sides of hydrogen and oxygen. It has the characteristics of real-time adjustment of the pressure difference on both sides of hydrogen and oxygen, high flexibility, no pollution, no carbon emissions, which provides a security guarantee for the development of the national hydrogen energy industry, and also provides support for the realization of the national carbon peak carbon neutrality .

In order to achieve the above purpose, the present application proposes a pressure difference regulating device for an electrolytic hydrogen production system, which includes an oxygen side separator, a hydrogen side separator, and a pipeline connecting the oxygen side separator and the hydrogen side separator. The pipeline is provided with movable parts for adjusting the pressure difference between the oxygen-side separator and the hydrogen-side separator.

Optionally, when the movable part is a piston, the piston is movably arranged in the pipeline.

Optionally, a controller is also included, and a first proximity switch and a second proximity switch are respectively provided on both sides of the piston in the pipeline, and the first proximity switch and the second proximity switch are respectively connected to the The controller is electrically connected.

Optionally, when the movable part is a gas film, the gas film is fixedly arranged in the pipeline at a position close to 1/3 of the oxygen-side separator.

Optionally, the air film has at least a double-layer film structure.

An electrolytic hydrogen production system, including the above-mentioned differential pressure regulating device of the electrolytic hydrogen production system, and an electrolytic cell, the two ends of the electrolytic cell are connected to the hydrogen-side separator and the oxygen-side separator respectively through pipelines connected.

Optionally, a first return line is further provided between the hydrogen-side separator and the electrolytic cell, and a hydrogen-side filter and a hydrogen-side cooler are sequentially arranged on the first return line along the liquid flow direction.

Optionally, a second return line is also provided between the oxygen-side separator and the electrolyzer, and the oxygen-side filter and the oxygen-side cooling line are sequentially arranged on the second return line along the liquid flow direction. device.

Optionally, a hydrogen side pump is also provided on the first return line between the hydrogen side cooler and the electrolytic cell.

Optionally, an oxygen side pump is also provided on the second return line between the oxygen side cooler and the electrolytic cell.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

Fig. 1 is a structural schematic diagram of a differential pressure regulating device of an electrolytic hydrogen production system proposed in an embodiment of the present application;

Fig. 2 is a schematic structural diagram of an electrolytic hydrogen production system proposed in another embodiment of the present application.

Detailed ways

Embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary, and are only for explaining the present application, and should not be construed as limiting the present application. On the contrary, the embodiments of the present application include all changes, modifications and equivalents falling within the spirit and scope of the appended claims.

Fig. 1 is a schematic structural diagram of a differential pressure regulating device of an electrolytic hydrogen production system proposed by an embodiment of the present application.

Referring to Fig. 1, a pressure difference regulating device of an electrolytic hydrogen production system includes an oxygen side separator 1, a hydrogen side separator 2 and a pipeline 3 connecting the oxygen side separator 1 and the hydrogen side separator 2, the A movable member 4 for adjusting the pressure difference between the oxygen-side separator 1 and the hydrogen-side separator 2 is arranged in the pipeline 3 . In this embodiment, the oxygen-side separator 1 and the hydrogen-side separator 2 are communicated through the pipeline 3. Since the gas production of the oxygen-side separator 1 and the hydrogen-side separator 2 are different, the two sides of the movable part 4 in the pipeline 3 A pressure difference is generated on both sides of the movable part 4, and the pressure is absorbed by the deformation or movement of the movable part 4, so that the pressure on both sides of the movable part 4 is rebalanced. Specifically, the oxygen-side separator 1, the hydrogen-side separator 2, and the pipeline 3 can be integrally formed, have good airtightness, and can react quickly when a pressure difference occurs. The gas phase part of the hydrogen-side separator 2 and the oxygen-side separator 1 is physically separated by the movable part 4. When there is a pressure difference between the hydrogen and oxygen sides, the movable part 4 will move or deform to the low-pressure side driven by the pressure difference until The pressure on both sides of hydrogen and oxygen is equal.

When the movable part 4 is a piston, the piston is movably arranged in the pipeline 3 . It can be understood that when the piston is installed in the pipe 3, it has better airtightness, so that it can quickly respond to the pressure difference on both sides of the piston. When the pressures of the hydrogen side separator 2 and the oxygen side separator 1 are not equal, driven by the pressure difference, the piston moves to the low pressure side, and the piston stops moving after the pressure on both sides is equal to complete the adjustment of the pressure difference.

A pressure difference regulating device of an electrolytic hydrogen production system further includes a controller, and a first proximity switch and a second proximity switch are respectively arranged on both sides of the piston in the pipeline 3, and the first proximity switch and the The second proximity switches are electrically connected to the controllers respectively. Specifically, the first proximity switch and the second proximity switch are respectively arranged at the left and right ends of the pipe 3. When the piston moves to the left end or the right end of the pipe 3 and is about to lose its adjustment function, the first proximity switch or the second proximity switch will The controller sends out a signal, which can inform the staff of the pressure control situation in the electrolysis hydrogen production system, so that the staff can respond in time and avoid potential safety hazards. In other embodiments, it also includes a pressure relief pipeline connected to the oxygen-side separator 1 and the hydrogen-side separator 2 respectively, and a valve is set on the pressure relief pipeline, which can be opened and closed by remote control of the controller, so that when the proximity switch senses the piston , it indicates how much the pressure in the electrolytic hydrogen production system is, which exceeds the adjustment range of the piston. At this time, the valve is opened to realize the pressure in the electrolytic hydrogen production system.

When the movable part 4 is a gas film, the gas film is fixedly arranged at a position of 1/3 of the pipeline 3 close to the oxygen-side separator 1 . Since the gas production of the oxygen-side separator 1 is smaller than that of the hydrogen-side separator 2, the gas film is set in the pipeline 3 close to the oxygen-side separator 1, and a part of the hydrogen produced by the hydrogen-side separator 2 can be stored in the pipeline 3 In, so that the device of the present application has a greater ability to adjust the pressure difference. When there is a pressure difference on both sides of the gas film, driven by the pressure difference, the gas film deforms and bulges toward the low pressure side, so that the pressure on both sides is restored to balance. The advantage of this structure compared with the piston is that the air tightness is guaranteed.

The gas film is at least a double-layer film structure. Since the air film is made of high-deformation material, the double-layer film setting can ensure safety and avoid accidental rupture of the air film.

As shown in Figure 2, an electrolytic hydrogen production system includes the above-mentioned pressure difference adjustment device of the electrolytic hydrogen production system, and also includes an electrolytic cell 5, and the two ends of the electrolytic cell 5 are respectively separated from the hydrogen side by pipelines The device 2 communicates with the oxygen side separator 1. The electrolytic cell 5 is filled with electrolyte solution and electrolyzed, and the produced hydrogen and oxygen flow to the hydrogen-side separator 2 and the oxygen-side separator 1 respectively for gas-liquid separation of oxygen and hydrogen.

A first return pipeline 6 is also provided between the hydrogen-side separator 2 and the electrolytic cell 5, and a hydrogen-side filter 7 and a hydrogen-side cooling system are sequentially arranged on the first return pipeline 6 along the liquid flow direction. device 8. Through the first return line 6, the electrolytic solution separated in the hydrogen-side separator 2 is returned to the electrolytic cell 5, and is filtered and cooled by the hydrogen-side filter 7 and the hydrogen-side cooler 8 in order to ensure the electrolysis of the return flow. liquid quality.

A second return line 9 is also provided between the oxygen side separator 1 and the electrolytic cell 5, and the oxygen side filter 10 and the oxygen side filter 10 are sequentially arranged on the second return line 9 along the liquid flow direction. side cooler 11. Through the second return line 9, the electrolytic solution separated in the oxygen-side separator 1 is returned to the electrolytic cell 5, and is filtered and cooled by the oxygen-side filter 10 and the oxygen-side cooler 11 in order to ensure the electrolysis of the return flow. liquid quality.

A hydrogen side pump 12 is also provided on the first return line 6 between the hydrogen side cooler 8 and the electrolytic cell 5 . An oxygen side pump 13 is also provided on the second return line 9 between the oxygen side cooler 1 and the electrolytic cell 5 . The hydrogen-side pump 12 and the oxygen-side pump 13 are arranged to improve the efficiency of the electrolyte in the hydrogen-side separator 2 and the oxygen-side separator 1 returning to the electrolytic cell 5, so that the electrolyte in the electrolytic cell 5 is sufficient to ensure electrolysis efficiency.

It should be noted that in the description of the present application, terms such as "first" and "second" are used for description purposes only, and should not be understood as indicating or implying relative importance. In addition, in the description of the present application, unless otherwise specified, "plurality" means two or more.

Any process or method descriptions in flowcharts or otherwise described herein may be understood to represent modules, segments or portions of code comprising one or more executable instructions for implementing specific logical functions or steps of the process , and the scope of alternative embodiments of the present application includes additional implementations in which functions may be performed out of the order shown or discussed, including substantially concurrently or in reverse order depending upon the functions involved, which It should be understood by those skilled in the art to which the embodiments of the present application belong.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations on the present application, and those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (10)

1. A pressure difference regulating device for an electrolytic hydrogen production system, characterized in that it includes an oxygen-side separator, a hydrogen-side separator, and a pipeline connecting the oxygen-side separator and the hydrogen-side separator, and a useful The movable part is used to adjust the pressure difference between the oxygen side separator and the hydrogen side separator.
2. The pressure difference regulating device of the electrolytic hydrogen production system according to claim 1, wherein when the movable part is a piston, the piston is movably arranged in the pipeline.
3. The pressure difference regulating device of the electrolytic hydrogen production system according to claim 2, further comprising a controller, a first proximity switch and a second proximity switch are respectively arranged on both sides of the piston in the pipeline, The first proximity switch and the second proximity switch are respectively electrically connected to the controller.
4. The pressure difference regulating device of the electrolytic hydrogen production system according to claim 1, wherein when the movable part is a gas film, the gas film is fixedly arranged in the pipeline close to 1/2 of the oxygen-side separator 3 positions.
5. The pressure difference regulating device of the electrolytic hydrogen production system according to claim 4, wherein the gas film is at least a double-layer film structure.
6. An electrolytic hydrogen production system, comprising the pressure difference regulating device of the electrolytic hydrogen production system according to any one of the above claims 1-5, and also comprising an electrolytic cell, the two ends of the electrolytic cell are respectively connected to the hydrogen A side separator communicates with the oxygen side separator.
7. The electrolytic hydrogen production system according to claim 6, characterized in that, a first return pipeline is further arranged between the hydrogen side separator and the electrolytic cell, and the first return pipeline is sequentially arranged along the liquid flow direction A hydrogen side filter and a hydrogen side cooler are provided.
8. The electrolytic hydrogen production system according to claim 6, characterized in that a second return line is arranged between the oxygen-side separator and the electrolytic cell, and the second return line is sequentially arranged along the flow direction of the liquid The oxygen side filter and the oxygen side cooler are provided.
9. The electrolytic hydrogen production system according to claim 7, characterized in that a hydrogen side pump is further arranged on the first return pipeline between the hydrogen side cooler and the electrolytic cell.
10. The electrolytic hydrogen production system according to claim 8, characterized in that an oxygen side pump is further arranged on the second return line between the oxygen side cooler and the electrolytic cell.

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