Circulating water recovery device of PEM water electrolysis hydrogen production system

Abstract

The utility model relates to the technical field of water treatment, and discloses a circulating water recovery device of a PEM water electrolysis hydrogen production system, which comprises a gas-water separator, a pneumatic valve is mounted at a water outlet of the gas-water separator through a pipeline, a liquid level transmitter is mounted on the inner wall of the gas-water separator, and a water outlet of the pneumatic valve is connected with a buffer tank; the filter is connected to a water outlet of the buffer tank through a pipeline, a deionizer is mounted at a water outlet of the filter, and a water outlet of the deionizer is connected with a water tank through a pipeline. According to the circulating water recovery device of the PEM water electrolysis hydrogen production system, the pneumatic valve is controlled to be opened through the additionally arranged liquid level transmitter when the liquid level reaches the upper limit of the set height, so that water can be drained, and the pneumatic valve is closed when the liquid level in the gas-water separator is reduced to the lower limit of the set liquid level, so that circulation can be performed according to the water quantity, the waste of water resources is effectively reduced, and the cost is reduced. The water supplementing frequency and the system power consumption are reduced.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, specifically to a circulating water recovery device for a PEM electrolysis water hydrogen production system. Background Technology

[0002] With the increasing global demand for clean energy, hydrogen, as a clean and efficient energy carrier, is playing an increasingly important role in the energy transition. There are various methods for producing hydrogen, among which PEM (proton exchange membrane) water electrolysis has attracted much attention due to its advantages such as high efficiency, environmental friendliness, and the ability to be applied in small-scale distributed systems. In the PEM water electrolysis process, hydrogen and oxygen are produced, while water is consumed and generated. Therefore, the effective management and recycling of water is a crucial aspect of this system.

[0003] Common circulating water recovery devices often use the method of returning water from the anode side of the electrolyzer to the water tank for recycling, and the water from the cathode side entering the gas-water separator and being collected and discharged by the water collector. However, this method results in a large amount of water accumulating over a long period of time due to the system's periodic drainage, causing the water replenishment system to work frequently and consume a lot of power. In addition, impurities are easily generated in the water during circulation, which affects the quality of the water and cannot meet the requirements of water treatment. Therefore, a circulating water recovery device for a PEM electrolysis water hydrogen production system is proposed. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a circulating water recovery device for a PEM electrolysis water hydrogen production system, which solves the technical problem of large accumulated water volume over a long period of time due to the system's periodic drainage, resulting in frequent operation of the water replenishment system and high power consumption.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a circulating water recovery device for a PEM water electrolysis hydrogen production system, comprising:

[0008] A gas-water separator, wherein a pneumatic valve is installed at the outlet of the gas-water separator via a pipeline, a liquid level transmitter is installed on the inner wall of the gas-water separator, and a buffer tank is connected to the outlet of the pneumatic valve.

[0009] A filter is connected to the outlet of a buffer tank via a pipe. A deionizer is installed at the outlet of the filter, and the outlet of the deionizer is connected to a water tank via a pipe.

[0010] The motor is mounted on the top right side of the filter via a bracket. A cam is coaxially connected to the outer end of the motor rotor. Filter media is installed in the middle of the inner cavity of the filter. A connecting shaft is inserted into the top right side of the filter. A screen plate is installed at the bottom end of the connecting shaft. An actuating plate is installed at the bottom of the screen plate. A connecting plate is installed at the top end of the connecting shaft.

[0011] Preferably, the internal control circuit of the level transmitter is connected to the internal control circuit of the pneumatic valve, and sealing gaskets are installed at the pipe connections of the gas-water separator, pneumatic valve, buffer tank, filter, deionizer and water tank to improve the sealing performance of the device.

[0012] Preferably, the agitator is arranged in a double-layered, staggered configuration, and each agitator has mesh openings inside to improve its ability to disperse water.

[0013] Preferably, springs are fitted on the outside of the connecting shaft column at the position between the connecting plate and the top of the filter, and the added springs facilitate the up-and-down reciprocating movement of the connecting plate and the connecting shaft column.

[0014] Preferably, the upper and lower ends of the spring are connected to the corresponding positions of the connecting plate and the top of the filter, respectively, which improves the stability of the connecting plate and the connecting shaft when they move up and down.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model provides a circulating water recovery device for a PEM electrolysis water hydrogen production system, which has the following beneficial effects:

[0017] 1. The circulating water recovery device of this PEM water electrolysis hydrogen production system, through the addition of a liquid level transmitter, controls the opening of the pneumatic valve when the liquid level reaches the upper limit of the set height, thereby draining water. When the liquid level in the gas-liquid separator drops to the lower limit of the set liquid level, it closes, and can then circulate according to the water volume, effectively reducing water waste, reducing the frequency of water replenishment, and reducing system power consumption. At the same time, the added buffer tank can reduce the impact of liquid on pipelines and subsequent processing equipment, improving the safety of the device during use.

[0018] 2. The circulating water recovery device of this PEM water electrolysis hydrogen production system uses a motor to drive the rotation of a cam, which in turn drives the connecting plate and connecting shaft to move up and down. This, in turn, disperses the water through a screen and agitator, ensuring that the water flow is evenly distributed throughout the filtration area. This prevents areas from being insufficiently filtered. After the water is dispersed, impurities in the water can come into more thorough contact with the filter media, improving the filtration quality. At the same time, the screen disperses the water, resulting in a more even pressure distribution on the filter media, which helps protect the filter media from damage due to excessive local pressure, extending the service life of the filter media. This makes the water flow more uniform throughout the outflow area, which is beneficial for the subsequent reuse of circulating water in the PEM water electrolysis hydrogen production system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the filter structure of this utility model;

[0021] Figure 3 This is a cross-sectional view of the filter structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the connecting plate and connecting shaft column structure of this utility model.

[0023] In the diagram: 1. Gas-liquid separator; 2. Pneumatic valve; 3. Level transmitter; 4. Buffer tank; 5. Filter; 6. Deionizer; 7. Water tank; 8. Motor; 9. Connecting shaft; 10. Mesh plate; 11. Actuating plate; 12. Filter medium; 13. Connecting plate; 14. Spring; 15. Cam. Detailed Implementation

[0024] 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.

[0025] This utility model provides a technical solution: a circulating water recovery device for a PEM electrolysis water hydrogen production system, comprising a gas-water separator 1, a pneumatic valve 2, a level transmitter 3, a buffer tank 4, a filter 5, a deionizer 6, a water tank 7, a motor 8, a connecting shaft 9, a screen plate 10, a toggle plate 11, a filter medium 12, a connecting plate 13, a spring 14, and a cam 15.

[0026] Please see Figure 1A pneumatic valve 2 is installed at the outlet of the gas-water separator 1 via a pipe. A level transmitter 3 is installed on the inner wall of the gas-water separator 1. A buffer tank 4 is connected to the outlet of the pneumatic valve 2.

[0027] Filter 5 is connected to the outlet of buffer tank 4 via a pipe. Deionizer 6 is installed at the outlet of filter 5. The outlet of deionizer 6 is connected to water tank 7 via a pipe. The internal control circuit of level transmitter 3 is connected to the internal control circuit of pneumatic valve 2. Sealing gaskets are installed at the pipe connections of air-water separator 1, pneumatic valve 2, buffer tank 4, filter 5, deionizer 6 and water tank 7. The added level transmitter 3 controls the opening of pneumatic valve 2 when the liquid level reaches the upper limit of the set height, so that drainage can be carried out. When the liquid level in air-water separator 1 drops to the lower limit of the set liquid level, it closes. Then, it can circulate according to the water volume, effectively reducing water waste, reducing water replenishment frequency, and reducing system power consumption. At the same time, the added buffer tank 4 can reduce the impact of liquid on pipelines and subsequent treatment equipment, and improve the safety of the device during use.

[0028] Please see Figure 2 Motor 8 is mounted on the top right side of filter 5 via a stand; please refer to [link / reference]. Figure 3 A cam 15 is coaxially connected to the outer end of the rotor of motor 8. A filter medium 12 is installed in the middle of the inner cavity of filter 5. A connecting shaft 9 is inserted into the top right side of filter 5. A mesh plate 10 is installed at the bottom end of the connecting shaft 9. An actuating plate 11 is installed at the bottom of the mesh plate 10. A connecting plate 13 is installed at the top end of the connecting shaft 9. The actuating plate 11 is arranged in a double-layered, staggered configuration, and each actuating plate 11 has mesh openings inside. Please refer to [link / reference]. Figure 4 Springs 14 are fitted on the outside of the connecting shaft 9 between the connecting plate 13 and the top of the filter 5. The upper and lower ends of the springs 14 are connected to the corresponding positions on the top of the connecting plate 13 and the filter 5, respectively. The rotation of the cam 15 driven by the motor 8 can push the connecting plate 13 and the connecting shaft 9 to move up and down. In turn, the water can be dispersed by the screen plate 10 and the agitator plate 11, which can ensure that the water flow is evenly distributed throughout the filtration area and avoid the situation of insufficient filtration in some areas. After the water is dispersed, the impurities in the water can come into more full contact with the filter medium 12, improving the filtration quality of the water. At the same time, after the screen plate 10 disperses the water, the pressure distribution of the water flow on the filter medium 12 is more even, which helps to protect the filter medium 12 and avoid damage due to excessive local pressure, thus extending the service life of the filter medium 12. This makes the water flow more uniform throughout the outflow area, which is conducive to the reuse of the circulating water in the PEM water electrolysis hydrogen production system.

[0029] This solution uses a level transmitter 3 to control the opening of the pneumatic valve 2 when the liquid level reaches the upper limit of the set height, thus enabling drainage. When the liquid level in the air-water separator 1 drops to the lower limit of the set liquid level, it closes, allowing for circulation based on water volume. This effectively reduces water waste, lowers the frequency of water replenishment, and reduces system power consumption. The added buffer tank 4 reduces the impact of liquid on pipelines and subsequent processing equipment, improving the safety of the device during operation. Simultaneously, the rotation of the cam 15 driven by the motor 8 pushes the connecting plate 13 and the connecting shaft 9 to move up and down, thereby allowing movement through the mesh plate 10 and the actuating plate 1. 1. Agitating and dispersing the water ensures that the water flow is evenly distributed throughout the filtration area, preventing areas from being insufficiently filtered. After the water is dispersed, impurities in the water can come into more thorough contact with the filter medium 12, improving the filtration quality. At the same time, after the mesh plate 10 disperses the water, the pressure distribution of the water flow on the filter medium 12 is more even, which helps protect the filter medium 12, preventing damage due to excessive local pressure and extending the service life of the filter medium 12. This makes the water flow more uniform throughout the outflow area, which is beneficial for the subsequent reuse of circulating water in the PEM water electrolysis hydrogen production system.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A circulating water recovery device of a PEM water electrolysis hydrogen production system, characterized by, include: A gas-water separator (1) is provided with a pneumatic valve (2) installed at the outlet of the gas-water separator (1) via a pipe. A liquid level transmitter (3) is installed on the inner wall of the gas-water separator (1). A buffer tank (4) is connected to the outlet of the pneumatic valve (2). A filter (5) is connected to the outlet of a buffer tank (4) via a pipe. A deionizer (6) is installed at the outlet of the filter (5). The outlet of the deionizer (6) is connected to a water tank (7) via a pipe. The motor (8) is mounted on the top right side of the filter (5) via a bracket. The outer end of the rotor of the motor (8) is coaxially connected to a cam (15). The filter (5) has a filter medium (12) installed in the middle of its inner cavity. A connecting shaft (9) is inserted into the top right side of the filter (5). A screen plate (10) is installed at the bottom end of the connecting shaft (9). A toggle plate (11) is installed at the bottom of the screen plate (10). A connecting plate (13) is installed at the top end of the connecting shaft (9).

2. The water recycling device of a PEM water-splitting hydrogen generation system according to claim 1, characterized in that: The internal control circuit of the level transmitter (3) is connected to the internal control circuit of the pneumatic valve (2). Sealing gaskets are installed at the pipe connections of the gas-water separator (1), pneumatic valve (2), buffer tank (4), filter (5), deionizer (6) and water tank (7).

3. The circulating water recovery device of the PEM electrolysis water hydrogen production system according to claim 1, characterized in that: The actuating plate (11) is arranged in a double-layered staggered manner, and the interior of the actuating plate (11) is provided with mesh holes.

4. The water recycling device of a PEM water-splitting hydrogen generation system according to claim 1, characterized in that: Springs (14) are fitted on the outside of the connecting shaft (9) at the position between the top of the connecting plate (13) and the filter (5).

5. The water recycling device of a PEM water-splitting hydrogen generation system according to claim 4, characterized in that: The upper and lower ends of the spring (14) are respectively connected to the corresponding positions on the top of the connecting plate (13) and the filter (5).

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