A high pressure pem electrolysis system

Abstract

The utility model relates to a kind of high-pressure PEM electrolysis system, belong to high-pressure electrolytic device technical field.The system includes high-pressure PEM electrolytic cell, hydrogen side electrolyte storage tank, oxygen side electrolyte storage tank and circulating pump, the bottom of hydrogen side electrolyte storage tank and oxygen side electrolyte storage tank is equipped with electrolyte outlet and electrolyte back mouth, gas balance tank is equipped with the slider of gas balance tank is divided into two chambers and is equipped with electrolytic liquid supplementing port, electrolytic liquid supplementing port is communicated with the electrolyte outlet of oxygen side electrolyte storage tank by second pipeline;The top of hydrogen side electrolyte storage tank and oxygen side electrolyte storage tank is equipped with gas balance outlet, and gas balance outlet is communicated with the two chambers of gas balance tank by third pipeline.The system avoids hydrogen gas bubble and oxygen gas bubble mutual stringing in and can balance the electrolytic alkali pressure balance of hydrogen side electrolytic alkali storage tank and oxygen side electrolytic alkali storage tank.

Description

Technical Field

[0001] This utility model relates to a high-voltage PEM electrolysis system and belongs to the technical field of high-voltage electrolysis devices. Background Technology

[0002] Currently, high-pressure PEM electrolysis devices or systems produce hydrogen by electrolyzing water through proton exchange membranes. During electrolysis, small bubbles (especially micron- and nano-sized bubbles) are generated, causing hydrogen and oxygen bubbles to intermingle in the electrolyte, leading to a decrease in hydrogen / oxygen purity and increased subsequent purification costs. Furthermore, the pressure difference between hydrogen and oxygen creates a pressure difference across the membrane in the electrolyzer, affecting the membrane's lifespan and also causing cross-contamination. Summary of the Invention

[0003] The technical problem to be solved by this invention is how to improve the purity of hydrogen / oxygen in a high-pressure PEM electrolysis device or system and reduce the pressure difference across the membrane of the electrolyzer.

[0004] The technical solution proposed by this utility model to solve the above-mentioned technical problems is as follows: a high-voltage PEM electrolysis system, including a high-voltage PEM electrolyzer, a hydrogen-side electrolyte storage tank, an oxygen-side electrolyte storage tank, and a circulation pump. Both the hydrogen-side and oxygen-side electrolyte storage tanks have electrolyte outlets at their bottoms and electrolyte return ports at their tops. The electrolyte inlet of the high-voltage PEM electrolyzer is connected to the electrolyte outlet of the oxygen-side electrolyte storage tank via a first pipeline. The electrolyte outlet of the high-voltage PEM electrolyzer is connected to the electrolyte return ports of both the hydrogen-side and oxygen-side electrolyte storage tanks via second pipelines. A circulating pump is connected in series with the first pipeline; it also includes a horizontal gas balance tank, which has a slider that divides the gas balance tank into two chambers. The bottom of the oxygen-side electrolyte storage tank is also provided with an electrolyte replenishment port, which is connected to the electrolyte outlet of the hydrogen-side electrolyte storage tank through a second pipeline; both the hydrogen-side electrolyte storage tank and the oxygen-side electrolyte storage tank are provided with gas balance outlets at their tops, and the two ends of the gas balance tank are provided with gas inlets that connect to the two chambers respectively. The gas balance outlet and the gas inlet are connected through a third pipeline.

[0005] Furthermore, the high-pressure PEM electrolyzer, hydrogen-side electrolyte storage tank, oxygen-side electrolyte storage tank, circulation pump, first pipeline, second pipeline, third pipeline, and gas balance tank are all resistant to high pressure.

[0006] Furthermore, the upper inner part of the hydrogen-side electrolyte storage tank and the oxygen-side electrolyte storage tank are respectively equipped with demisters facing the electrolyte return port.

[0007] Furthermore, a slider position sensor is installed inside the gas balance tank.

[0008] Furthermore, the top of the hydrogen-side electrolyte storage tank and the oxygen-side electrolyte storage tank are respectively provided with hydrogen vent and oxygen vent, and both the hydrogen vent and the oxygen vent are connected to a safety valve.

[0009] Furthermore, level sensors are respectively installed on the sides of the hydrogen-side electrolyte storage tank and the oxygen-side electrolyte storage tank.

[0010] The beneficial effects of this utility model are: 1) Since only the electrolyte in the oxygen-side electrolytic alkaline solution storage tank is circulated into the high-pressure PEM electrolytic cell, hydrogen bubbles and oxygen bubbles are prevented from entering the electrolyte in the hydrogen-side and oxygen-side electrolytic alkaline solution storage tanks; 2) The gas pressure balance between the hydrogen-side and oxygen-side electrolytic alkaline solution storage tanks can be balanced by the gas balance tank, and the pressure balance of the electrolyte in the hydrogen-side and oxygen-side electrolytic alkaline solution storage tanks can be maintained by the second pipeline; 3) The gas pressure in the hydrogen-side and oxygen-side electrolytic alkaline solution storage tanks can be appropriately adjusted by the hydrogen and oxygen vents, thereby adjusting the electrolyte pressure in the hydrogen-side and oxygen-side electrolytic alkaline solution storage tanks. Attached Figure Description

[0011] The high-voltage PEM electrolysis system of this utility model will be further described below with reference to the accompanying drawings.

[0012] Figure 1 This is a schematic diagram of the high-voltage PEM electrolysis system according to an embodiment of the present invention. Detailed Implementation Example

[0013] The high-voltage PEM electrolysis system of this embodiment, such as Figure 1 As shown, the system includes a high-pressure PEM electrolyzer 1, a hydrogen-side electrolyte storage tank 4, an oxygen-side electrolyte storage tank 3, and a circulation pump 2. Both the hydrogen-side electrolyte storage tank 4 and the oxygen-side electrolyte storage tank 3 have electrolyte outlets at their bottoms: the electrolyte outlet 6 of the hydrogen-side electrolyte storage tank 4 and the electrolyte alkaline solution outlet 5 of the oxygen-side electrolyte storage tank 3. Both the hydrogen-side electrolyte storage tank 4 and the oxygen-side electrolyte storage tank 3 have electrolyte return ports at their tops: the electrolyte return port 11 of the hydrogen-side electrolyte storage tank 4 and the electrolyte return port 10 of the oxygen-side electrolyte storage tank 4. The electrolyte inlet 7 of the high-pressure PEM electrolyzer 1 is connected to the electrolyte outlet 5 of the oxygen-side electrolyte storage tank 3 through the first pipeline 8. The electrolyte outlet 9 of the high-pressure PEM electrolyzer 1 is connected to the electrolyte return ports 11 and 10 of the hydrogen-side electrolyte storage tank 4 and the oxygen-side electrolyte storage tank 3 through the second pipeline 12. The circulation pump 2 is connected in series with the first pipeline 8.

[0014] like Figure 1As shown, the high-pressure PEM electrolysis system of this embodiment also includes a horizontal gas balance tank 13. The gas balance tank 13 has a slider 16 that divides it into two chambers: a hydrogen-side chamber 15 and an oxygen-side chamber 14. The bottom of the oxygen-side electrolyte storage tank 3 is also provided with an electrolyte replenishment port 17, which is connected to the electrolyte outlet 6 of the hydrogen-side electrolyte storage tank 4 via a second pipeline 18. Both the hydrogen-side electrolyte storage tank 4 and the oxygen-side electrolyte storage tank 3 have gas balance outlets at their tops: a gas balance outlet 20 for the hydrogen-side electrolyte storage tank 4 and a gas balance outlet 19 for the oxygen-side electrolyte storage tank 4. The two ends of the gas balance tank 13 have gas inlets that connect to the two chambers 14 and 15, respectively: a gas inlet 22 for the hydrogen-side chamber 15 and a gas inlet 21 for the oxygen-side chamber 14. Gas balance outlets 19 and 20 are connected to gas inlets 21 and 22 respectively via a third pipeline 29.

[0015] like Figure 1 As shown, the high-pressure PEM electrolyzer 1, hydrogen-side electrolyte storage tank 4, oxygen-side electrolyte storage tank 3, circulation pump 2, first pipeline 5, second pipeline 6, third pipeline 7, and gas balance tank 13 are all pressure-resistant. The upper inner portion of the hydrogen-side electrolyte storage tank 4 and the oxygen-side electrolyte storage tank 3 are respectively equipped with demisters 23 facing the electrolyte return ports 11 and 10. The gas balance tank 13 is equipped with a slider position sensor 24. The top of the hydrogen-side electrolyte storage tank 4 and the oxygen-side electrolyte storage tank 3 are respectively equipped with a hydrogen discharge port 26 and an oxygen discharge port 25, both connected to shut-off valves 28 and 27. The sides of the hydrogen-side electrolyte storage tank 4 and the oxygen-side electrolyte storage tank 3 are respectively equipped with level sensors 31 and 30.

[0016] In use, if hydrogen is needed, valve 28 is opened, and hydrogen is discharged through hydrogen outlet 26. At this time, because the pressure on the oxygen side is greater than that on the hydrogen side, slider 16 slides towards the hydrogen side (right) to balance the hydrogen-oxygen pressure difference. Position sensor 24 reflects the position of slider 16. If slider 16 is biased towards the hydrogen side (right), oxygen outlet shut-off valve 27 is opened to appropriately discharge some oxygen, maintaining the gas pressure balance inside the hydrogen-side electrolyte storage tank 4 and the oxygen-side electrolyte storage tank 3. This process can be automatically controlled by repeatedly opening and closing shut-off valves 28 and 27 to keep slider 16 in the middle of the gas balance tank 13 as much as possible, thereby balancing the gas pressure difference inside the hydrogen-side electrolyte storage tank 4 and the oxygen-side electrolyte storage tank 3. At the same time, the pressure balance of the electrolyte in the hydrogen-side electrolyte storage tank 4 and the oxygen-side electrolyte storage tank 3 is maintained through the second pipeline 18. Electrolyte can be replenished through electrolyte replenishment port 17, but care must be taken to ensure that the pressure of the replenished electrolyte is greater than the electrolyte pressure in the oxygen-side electrolyte storage tank 3.

[0017] This utility model is not limited to the above embodiments. All technical solutions formed by equivalent substitutions fall within the protection scope claimed by this utility model.

Claims

1. A high-voltage PEM electrolysis system, comprising a high-voltage PEM electrolyzer, a hydrogen-side electrolyte storage tank, an oxygen-side electrolyte storage tank, and a circulation pump, wherein the bottom of both the hydrogen-side and oxygen-side electrolyte storage tanks is provided with an electrolyte outlet, and the upper part of both tanks is provided with an electrolyte return port; the electrolyte inlet of the high-voltage PEM electrolyzer is connected to the electrolyte outlet of the hydrogen-side electrolyte storage tank via a first pipeline, and the electrolyte outlet of the high-voltage PEM electrolyzer is connected to the electrolyte return ports of both the hydrogen-side and oxygen-side electrolyte storage tanks via second pipelines; the circulation pump is connected in series with the first pipeline; characterized in that... It also includes a horizontal gas balance tank, which has a slider that divides the gas balance tank into two chambers. The bottom of the hydrogen-side electrolyte storage tank is also provided with an electrolyte replenishment port, which is connected to the electrolyte outlet of the oxygen-side electrolyte storage tank through a second pipeline. The top of both the hydrogen-side and oxygen-side electrolyte storage tanks is provided with a gas balance outlet, and both ends of the gas balance tank are provided with gas inlets that connect to the two chambers respectively. The gas balance outlet and the gas inlet are connected through a third pipeline.

2. The high-voltage PEM electrolysis system according to claim 1, characterized in that: The high-pressure PEM electrolyzer, hydrogen-side electrolyte storage tank, oxygen-side electrolyte storage tank, circulation pump, first pipeline, second pipeline, third pipeline, and gas balance tank are all resistant to high pressure.

3. The high-voltage PEM electrolysis system according to claim 1, characterized in that: The upper inner part of the hydrogen-side electrolyte storage tank and the oxygen-side electrolyte storage tank are respectively equipped with demisters facing the electrolyte return port.

4. The high-voltage PEM electrolysis system according to claim 1, 2, or 3, characterized in that: The gas balance tank is equipped with a slider position sensor.

5. The high-voltage PEM electrolysis system according to claim 1, 2, or 3, characterized in that: The top of the hydrogen-side electrolyte storage tank and the oxygen-side electrolyte storage tank are respectively provided with hydrogen vent and oxygen vent, and both the hydrogen vent and the oxygen vent are connected to a safety valve.

6. The high-voltage PEM electrolysis system according to claim 1, 2 or 3, characterized in that: Liquid level sensors are respectively installed on the sides of the hydrogen-side electrolyte storage tank and the oxygen-side electrolyte storage tank.

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