A high-pressure caustic electrolysis system

Abstract

The utility model relates to a kind of high-pressure lye electrolysis system, belong to high-pressure electrolytic device technical field.The system includes high-pressure electrolytic cell, hydrogen side electrolytic lye storage tank, oxygen side electrolytic lye storage tank and circulating pump, further include horizontal electrolytic lye balance tank, electrolytic lye balance tank is equipped with the slider that electrolytic lye balance tank is separated two chambers, hydrogen side electrolytic lye storage tank, high-pressure electrolytic cell and electrolytic lye balance tank constitute hydrogen side electrolytic lye's first circulation loop between;Oxygen side electrolytic lye storage tank, high-pressure electrolytic cell and electrolytic lye balance tank constitute oxygen side electrolytic lye's second circulation loop between.The system avoids hydrogen gas bubble and oxygen gas bubble mutual stringing into and can balance hydrogen side electrolytic lye storage tank and oxygen side electrolytic lye storage tank electrolytic lye pressure balance.

Description

Technical Field

[0001] This utility model relates to a high-pressure alkaline solution electrolysis system, belonging to the technical field of high-pressure electrolysis devices. Background Technology

[0002] Currently, high-pressure alkaline electrolysis devices or systems generate small bubbles (especially micron- and nano-sized bubbles) during electrolysis, causing hydrogen and oxygen bubbles to cross-into the electrolyte, resulting in a decrease in the purity of hydrogen / oxygen and an increase in subsequent purification costs. Moreover, the pressure difference between hydrogen and oxygen will create a pressure difference across the membrane of the electrolyzer, affecting the membrane's service life and also causing cross-intolerance of gas across the membrane. 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 alkaline 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-pressure alkaline solution electrolysis system, including a high-pressure electrolytic cell, a hydrogen-side alkaline solution storage tank, an oxygen-side alkaline solution storage tank, and a circulation pump. Both the hydrogen-side and oxygen-side alkaline solution storage tanks have alkaline solution outlets at their bottoms and alkaline solution return ports at their tops. The alkaline solution inlet of the high-pressure electrolytic cell is connected to the alkaline solution outlets of the hydrogen-side and oxygen-side alkaline solution storage tanks respectively through a first pipeline. The outlet is connected to the return ports of the electrolytic alkali storage tanks on the hydrogen side and the oxygen side via a second pipeline, and a circulation pump is connected in series to the first pipeline; it also includes a horizontal electrolytic alkali balance tank, which is equipped with a slider that divides the electrolytic alkali balance tank into two chambers. The bottom of both the hydrogen-side and oxygen-side electrolytic alkali storage tanks is also provided with an electrolytic alkali balance outlet, and both ends of the electrolytic alkali balance tank are provided with electrolytic alkali balance inlets that connect to the two chambers respectively. The electrolytic alkali balance outlet and the electrolytic alkali balance inlet are connected via a third pipeline.

[0005] Furthermore, the hydrogen-side electrolytic alkali storage tank, the high-pressure electrolytic cell, and the electrolytic alkali balance tank form a first circulation loop for the hydrogen-side electrolytic alkali; the oxygen-side electrolytic alkali storage tank, the high-pressure electrolytic cell, and the electrolytic alkali balance tank form a second circulation loop for the oxygen-side electrolytic alkali, and the first circulation loop and the second circulation loop are isolated from each other.

[0006] Furthermore, the high-pressure electrolytic cell, the hydrogen-side electrolytic alkali storage tank, the oxygen-side electrolytic alkali storage tank, the circulating pump, the first pipeline, the second pipeline, the third pipeline, and the electrolytic alkali balance tank are all resistant to high pressure.

[0007] Furthermore, the upper inner part of the hydrogen-side electrolytic alkali storage tank and the oxygen-side electrolytic alkali storage tank are respectively equipped with demisters facing the electrolytic alkali return port.

[0008] Furthermore, the electrolytic alkali balance tank is equipped with a slider position sensor.

[0009] Furthermore, the top of the hydrogen-side electrolytic alkaline solution storage tank and the oxygen-side electrolytic alkaline solution storage tank are respectively provided with hydrogen vent and oxygen vent, and both the hydrogen vent and the oxygen vent are connected to safety valves.

[0010] Furthermore, the bottom of the hydrogen-side electrolytic alkali storage tank and the oxygen-side electrolytic alkali storage tank are respectively provided with an electrolytic alkali replenishment port.

[0011] Furthermore, level sensors are respectively installed on the sides of the hydrogen-side electrolytic alkaline solution storage tank and the oxygen-side electrolytic alkaline solution storage tank.

[0012] Furthermore, the circulating pumps are a hydrogen-side circulating pump for circulating the electrolytic alkali solution in the hydrogen-side electrolytic alkali solution storage tank and an oxygen-side circulating pump for circulating the electrolytic alkali solution in the oxygen-side electrolytic alkali solution storage tank.

[0013] The beneficial effects of this utility model are: 1) Since the electrolyzed alkaline solution in the hydrogen-side electrolyzed alkaline solution storage tank and the electrolyzed alkaline solution in the oxygen-side electrolyzed alkaline solution storage tank are isolated from each other in the first circulation loop and the second circulation loop respectively, hydrogen bubbles and oxygen bubbles are prevented from interfering with each other; 2) The electrolyzed alkaline solution balance tank can balance the electrolyzed alkaline solution pressure between the hydrogen-side electrolyzed alkaline solution storage tank and the oxygen-side electrolyzed alkaline solution storage tank; 3) The gas pressure in the hydrogen-side electrolyzed alkaline solution storage tank and the oxygen-side electrolyzed alkaline solution storage tank can be appropriately adjusted through the hydrogen vent and the oxygen vent, thereby adjusting the electrolyzed alkaline solution pressure in the hydrogen-side electrolyzed alkaline solution storage tank and the oxygen-side electrolyzed alkaline solution storage tank. Attached Figure Description

[0014] The high-pressure alkaline electrolysis system of this utility model will be further described below with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the structure of the high-pressure alkaline electrolysis device or system according to an embodiment of this utility model. Detailed Implementation Example

[0016] The high-pressure alkaline electrolysis system in this embodiment is as follows: Figure 1As shown, the system includes a high-voltage electrolytic cell 34, a hydrogen-side alkaline solution storage tank 9, an oxygen-side alkaline solution storage tank 10, and two circulation pumps: a hydrogen-side circulation pump 21 for circulating alkaline solution within the hydrogen-side alkaline solution storage tank and an oxygen-side circulation pump 22 for circulating alkaline solution within the oxygen-side alkaline solution storage tank. Both the hydrogen-side and oxygen-side alkaline solution storage tanks 9 and 10 have alkaline solution outlets at their bottoms: outlet 13 for the hydrogen-side tank and outlet 14 for the oxygen-side tank. Both tanks 9 and 10 have alkaline solution return ports at their tops: return port 11 for the hydrogen-side tank and return port 12 for the oxygen-side tank. The high-voltage electrolyzer 34 has two alkali inlets: a hydrogen-side alkali inlet 23 and an oxygen-side alkali inlet 24. These inlets are connected to the alkali outlets 13 and 14 of the hydrogen-side alkali storage tank 9 and the oxygen-side alkali storage tank 10, respectively, via a first pipeline 5. The high-voltage electrolyzer 34 also has two alkali outlets: a hydrogen-side alkali outlet 25 and an oxygen-side alkali outlet 26. These outlets are connected to the alkali return ports 11 and 12 of the hydrogen-side alkali storage tank 9 and the oxygen-side alkali storage tank 10, respectively, via a second pipeline 6. A hydrogen-side circulation pump 21 and an oxygen-side circulation pump 22 are connected in series in the first pipeline 5.

[0017] like Figure 1 As shown, the high-pressure alkaline electrolysis system of this embodiment also includes a horizontal alkaline balance tank 8. The alkaline balance tank 8 has a slider 29 that divides it into two chambers: a hydrogen-side chamber 31 and an oxygen-side chamber 32. Both the hydrogen-side alkaline storage tank 9 and the oxygen-side alkaline storage tank 10 have alkaline balance outlets at their bottoms: a hydrogen-side alkaline balance outlet 15 and an oxygen-side alkaline balance outlet 16, respectively. The alkaline balance tank 8 has alkaline balance inlets at both ends, connecting to the two chambers: a hydrogen-side alkaline balance inlet 27 and an oxygen-side alkaline balance inlet 28, respectively. The alkaline balance outlets 15 and 16 are connected to the alkaline balance inlets 27 and 28, respectively, via a third pipeline 7.

[0018] An electrolytic alkali balance tank 7 is equipped with a slider position sensor 30. The tops of the hydrogen-side electrolytic alkali storage tank 9 and the oxygen-side electrolytic alkali storage tank 10 are respectively equipped with hydrogen vent 3 and oxygen vent 4, both connected to safety valves 1 and 2. The bottoms of the hydrogen-side and oxygen-side electrolytic alkali storage tanks 9 and 10 are respectively equipped with electrolytic alkali replenishment ports 17 and 18. The sides of the hydrogen-side and oxygen-side electrolytic alkali storage tanks 9 and 10 are respectively equipped with level sensors 35 and 36. Demisters, namely hydrogen-side demister 19 and oxygen-side demister 20, are respectively installed in the upper inner part of the hydrogen-side and oxygen-side electrolytic alkali storage tanks 9 and 10, directly opposite the electrolytic alkali return ports 11 and 12. The high-pressure electrolytic cell 34, the hydrogen-side electrolytic alkali storage tank 9, the oxygen-side electrolytic alkali storage tank 10, the circulating pumps 21 and 22, the first pipeline 5, the second pipeline 6, the third pipeline 7, and the electrolytic alkali balance tank 8 are all resistant to high pressure.

[0019] In use, the electrolyte solution from the hydrogen-side electrolytic alkali storage tank 9 exits from the electrolyte solution outlet 13, enters the hydrogen-side electrolytic alkali inlet 23 of the high-pressure electrolytic cell 34 through the first pipeline 5 and the hydrogen-side circulation pump 21, then exits from the hydrogen-side electrolytic alkali outlet 25 of the high-pressure electrolytic cell 34, and returns to the hydrogen-side electrolytic alkali storage tank 9 through the second pipeline 6 and the electrolyte return port 11. Simultaneously, the electrolyte solution from the hydrogen-side electrolytic alkali storage tank 9 enters the hydrogen-side chamber 31 of the electrolyte balance tank 8 through the electrolyte balance outlet 15, the third pipeline 7, and the hydrogen-side electrolytic alkali balance inlet 27. Thus, the hydrogen-side electrolytic alkali storage tank 9, the high-pressure electrolytic cell 34, and the hydrogen-side chamber 31 of the electrolyte balance tank 8 form the first circulation loop for the hydrogen-side electrolytic alkali solution.

[0020] Similarly, the alkali electrolyte in the oxygen-side electrolytic alkali storage tank 10 exits from the alkali electrolyte outlet 14, enters the oxygen-side electrolytic alkali inlet 24 of the high-pressure electrolytic cell 34 through the first pipeline 5 and the oxygen-side circulation pump 22, then exits from the oxygen-side electrolytic alkali outlet 26 of the high-pressure electrolytic cell 34, and returns to the oxygen-side electrolytic alkali storage tank 10 through the second pipeline 6 and the electrolytic alkali return port 12. Simultaneously, the alkali electrolyte in the oxygen-side electrolytic alkali storage tank 10 enters the oxygen-side chamber 32 of the electrolytic alkali balance tank 8 through the electrolytic alkali balance outlet 16, the third pipeline 7, and the oxygen-side electrolytic alkali balance inlet 28. Thus, the oxygen-side electrolytic alkali storage tank 10, the high-pressure electrolytic cell 34, and the oxygen-side chamber 32 of the electrolytic alkali balance tank 8 form a second circulation loop for the oxygen-side electrolytic alkali. The first circulation loop and the second circulation loop are isolated from each other.

[0021] The electrolyte solution from the hydrogen-side electrolytic alkali storage tank 9 flows into the hydrogen-side chamber 31 of the electrolytic alkali balance tank 8, while the electrolyte solution from the oxygen-side electrolytic alkali storage tank 10 flows into the oxygen-side chamber 32 of the electrolytic alkali balance tank 8. The electrolyte solutions in the hydrogen-side chamber 31 and the oxygen-side chamber 32 are located on opposite sides of the slider 29. When the pressure of the electrolyte solution in the hydrogen-side chamber 31 is greater than that in the oxygen-side chamber 32, the slider 29 slides to the right within the electrolytic alkali balance tank 8. When the pressure of the electrolyte solution in the hydrogen-side chamber 31 is less than that in the oxygen-side chamber 32, the slider 29 slides to the left within the electrolytic alkali balance tank 8. In this way, the slider 29 slides left and right within the electrolytic alkali balance tank 8, thereby balancing the electrolyte pressures of the hydrogen-side electrolytic alkali storage tank 9 and the oxygen-side electrolytic alkali storage tank 10.

[0022] In addition, the electrolytic alkali balance tank 8 is equipped with a slider position sensor 30 to measure the position of slider 29. If slider 29 is too biased to the left or right, hydrogen vent 3 and oxygen vent 4 can be opened to appropriately release some hydrogen from hydrogen-side electrolytic alkali storage tank 9 or oxygen from oxygen-side electrolytic alkali storage tank 10, thus maintaining the gas pressure balance inside hydrogen-side electrolytic alkali storage tank 9 and oxygen-side electrolytic alkali storage tank 10. This ensures that slider 29 in electrolytic alkali balance tank 8 is in the middle or near the middle position, and also maintains the electrolytic alkali pressure balance between hydrogen-side electrolytic alkali storage tank 9 and oxygen-side electrolytic alkali storage tank 10.

[0023] 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-pressure alkaline electrolysis system, comprising a high-pressure electrolytic cell, a hydrogen-side alkaline electrolysis solution storage tank, an oxygen-side alkaline electrolysis solution storage tank, and a circulation pump. Both the hydrogen-side and oxygen-side alkaline electrolysis solution storage tanks have alkaline electrolysis solution outlets at their bottoms and alkaline electrolysis solution return ports at their tops. The alkaline electrolysis solution inlet of the high-pressure electrolytic cell is connected to the alkaline electrolysis solution outlets of the hydrogen-side and oxygen-side alkaline electrolysis solution storage tanks respectively via a first pipeline. The alkaline electrolysis solution outlet of the high-pressure electrolytic cell is connected to the alkaline electrolysis solution return ports of the hydrogen-side and oxygen-side alkaline electrolysis solution storage tanks respectively via a second pipeline. The circulation pump is connected in series with the first pipeline. It also includes a horizontal alkali electrolyte balance tank, which is equipped with a slider that divides the alkali electrolyte balance tank into two chambers. The bottom of both the hydrogen-side alkali electrolyte storage tank and the oxygen-side alkali electrolyte storage tank is also provided with an alkali electrolyte balance outlet. Both ends of the alkali electrolyte balance tank are provided with alkali electrolyte balance inlets that connect to the two chambers respectively. The alkali electrolyte balance outlet and the alkali electrolyte balance inlet are connected through a third pipeline.

2. The high-pressure alkaline electrolysis system according to claim 1, characterized in that: The hydrogen-side electrolytic alkali storage tank, the high-voltage electrolytic cell, and the electrolytic alkali balance tank form a first circulation loop for the hydrogen-side electrolytic alkali; the oxygen-side electrolytic alkali storage tank, the high-voltage electrolytic cell, and the electrolytic alkali balance tank form a second circulation loop for the oxygen-side electrolytic alkali, and the first circulation loop and the second circulation loop are isolated from each other.

3. The high-pressure alkaline electrolysis system according to claim 1, characterized in that: The high-pressure electrolytic cell, the hydrogen-side electrolytic alkali storage tank, the oxygen-side electrolytic alkali storage tank, the circulating pump, the first pipeline, the second pipeline, the third pipeline, and the electrolytic alkali balance tank are all resistant to high pressure.

4. The high-pressure alkaline electrolysis system according to claim 1, 2, or 3, characterized in that: The upper inner part of the hydrogen-side electrolytic alkali storage tank and the oxygen-side electrolytic alkali storage tank are respectively equipped with demisters facing the return port of the electrolytic alkali.

5. The high-pressure alkaline electrolysis system according to claim 1, 2, or 3, characterized in that: The electrolytic alkali balance tank is equipped with a slider position sensor.

6. The high-pressure alkaline electrolysis system according to claim 1, 2 or 3, characterized in that: The top of the hydrogen-side electrolytic alkali storage tank and the oxygen-side electrolytic alkali storage tank are respectively provided with hydrogen vent and oxygen vent, and both the hydrogen vent and the oxygen vent are connected to safety valves.

7. The high-pressure alkaline electrolysis system according to claim 1, 2 or 3, characterized in that: The bottom of the hydrogen-side electrolytic alkali storage tank and the oxygen-side electrolytic alkali storage tank are respectively provided with an electrolytic alkali replenishment port.

8. The high-pressure alkaline 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 electrolytic alkali storage tank and the oxygen-side electrolytic alkali storage tank.

9. The high-pressure alkaline electrolysis system according to claim 1, 2 or 3, characterized in that: The circulating pumps are a hydrogen-side circulating pump for circulating the electrolytic alkali solution in the hydrogen-side electrolytic alkali solution storage tank and an oxygen-side circulating pump for circulating the electrolytic alkali solution in the oxygen-side electrolytic alkali solution storage tank.

Images