Alkali liquor circulating hydrogen production device

Abstract

The utility model relates to the technical field of hydrogen production by electrolyzing an alkaline aqueous solution, in particular to an alkaline liquor circulating hydrogen production device, which comprises a gas-liquid separator, an electrolytic bath, a booster pump and a non-return component, a separation outlet is arranged at the bottom end of the gas-liquid separator, a separation inlet is arranged at the top end of the gas-liquid separator, a liquid inlet is arranged at the bottom end of the electrolytic bath, and a liquid outlet is arranged at the bottom end of the booster pump. The top end of the electrolytic cell is provided with a gas-liquid outlet, the separation outlet is connected with the liquid inlet through a first pipeline, the booster pump and the non-return assembly are arranged on the first pipeline, the gas-liquid outlet is connected with the separation inlet through a second pipeline, the top end of the second pipeline is higher than the gas-liquid outlet, and the bottom end of the gas-liquid separator is lower than the top end of the electrolytic cell. And liquid flows back to the gas-liquid separator through the second pipeline after passing through the gas-liquid separator, the first pipeline and the electrolytic bath to form circulation. And the height of the gas-liquid separator is reduced while the electrolytic bath is always filled with liquid, the problem that the skid-mounted height of an existing device exceeds the limit is solved, and the transportation difficulty and the transportation cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of producing hydrogen by electrolyzing alkaline aqueous solution, in particular to an alkaline solution circulating hydrogen production device. Background Art

[0002] In the existing alkaline liquid circulation hydrogen production device, the fluid enters the electrolytic cell from the low position of the liquid phase space of the gas-liquid separator, and then flows back to the gas-liquid separator to form a cycle. The electrolytic cell is filled with alkaline liquid, and hydrogen and oxygen are produced under the action of electrolysis. The produced gas will be mixed in the alkaline liquid. The fluid mixed with gas enters the gas-liquid separator through the pipeline, and the gas and liquid are separated in the gas-liquid separator. The gas is discharged through the exhaust port, and the liquid continues to enter the electrolytic cell for circulation electrolysis.

[0003] The separator and electrolyzer of the existing hydrogen production device are interconnected. It is necessary to ensure that the electrolyzer is always full of liquid, otherwise the electrolyzer will burn empty, which poses certain safety hazards. Therefore, in order to ensure that the electrolyzer is always full of liquid, the gas-liquid separator must be completely higher than the height of the electrolyzer. This limits the installation height of the gas-liquid separator to not be too low. When the equipment model increases, the equipment size also increases. When it is a skid-mounted device, the equipment installation height will exceed the transportation height, increasing the difficulty and cost of transportation. Utility Model Content

[0004] The utility model aims to provide a alkali solution circulation hydrogen production device to solve the problems in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is to provide a hydrogen production device by electrolysis of water, including a gas-liquid separator, an electrolyzer, a booster pump and a check assembly, wherein the bottom end of the gas-liquid separator is provided with a separation outlet, the top end of the gas-liquid separator is provided with a separation inlet, the bottom end of the electrolyzer is provided with a liquid inlet, the top end of the electrolyzer is provided with a gas-liquid outlet, the separation outlet is connected to the liquid inlet through a first pipeline, the booster pump and the check assembly are arranged on the first pipeline, the gas-liquid outlet is connected to the separation inlet through a second pipeline, the top end of the second pipeline is higher than the gas-liquid outlet, the bottom end of the gas-liquid separator is lower than the top end of the electrolyzer, and the liquid flows back to the gas-liquid separator through the second pipeline after passing through the gas-liquid separator, the first pipeline and the electrolyzer to form a circulation.

[0006] Furthermore, the second pipeline includes a connecting section, a rising section and a drainage section which are connected in sequence, the end of the connecting section is connected to the gas-liquid outlet and is arranged level with the gas-liquid outlet, the rising section is arranged in a direction higher than the connecting section, and the drainage section connects the rising section and the separation inlet.

[0007] Furthermore, a liquid level switch is provided in the connecting section or the rising section.

[0008] Furthermore, the water electrolysis hydrogen production device also includes a filter, and the filter is arranged on the first pipeline.

[0009] Furthermore, the check assembly is arranged between the boost pump and the electrolytic cell, and the filter is arranged between the boost pump and the check assembly.

[0010] Furthermore, the non-return assembly comprises a cut-off valve and a check valve connected in sequence, and the fluid in the first pipeline first flows through the check valve and then flows through the cut-off valve.

[0011] Furthermore, a flow meter is provided on the first pipeline.

[0012] Furthermore, the gas-liquid separators are in multiple groups, the first pipeline includes multiple first branches, the first branches are connected to the corresponding separation outlets of the gas-liquid separators, and the second pipeline includes multiple second branches, the second branches are connected to the corresponding separation inlets of the gas-liquid separators.

[0013] The beneficial effects of the utility model are:

[0014] 1. When the booster pump stops working, considering that the liquid level in the separator may be lower than the highest point of the electrolytic cell, the check assembly on the first pipeline prevents the liquid in the electrolytic cell from flowing back to the gas-liquid separator, causing a gas phase space to form on the upper part of the electrolytic cell. The top of the second pipeline is higher than the gas-liquid outlet, so that there is a certain amount of alkali liquid in the second pipeline to supplement the liquid level drop caused by the gas precipitation in the electrolytic cell due to long-term static standing. While ensuring that the electrolytic cell is always full of liquid, the height of the gas-liquid separator is reduced, solving the problem of excessive skid height in existing devices, and reducing transportation difficulty and transportation costs.

[0015] 2. The second pipeline includes a connecting section, an elevated section and a drainage section connected in sequence. The end of the connecting section is connected to the gas-liquid outlet and is arranged in parallel with the gas-liquid outlet. The elevated section is arranged in a direction higher than the connecting section. The drainage section connects the elevated section and the separation inlet. A certain amount of alkali solution is stored in the elevated section, which can supplement the liquid level drop caused by the long-term standing of the electrolytic cell due to the precipitation of gas.

[0016] 3. A liquid level switch is provided in the connecting section or the rising section, which can indirectly detect whether the electrolytic cell is full of liquid.

[0017] 4. The electrolytic water hydrogen production device also includes a filter, which is arranged on the first pipeline. The check assembly is arranged between the booster pump and the electrolyzer, and the filter is arranged between the booster pump and the check assembly. The check assembly is arranged at the downstream position of the first pipeline to prevent the liquid from flowing back from various upstream components. If the check assembly is arranged at the upstream position of the first pipeline, the filter is prone to backflow and cause blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 The present invention provides an overall structural diagram of a water electrolysis hydrogen production device according to an embodiment of the present invention.

[0020] Description of reference numerals:

[0021] 1. Gas-liquid separator; 11. Separation outlet; 12. Separation inlet; 2. Electrolyzer; 21. Liquid inlet; 22. Gas-liquid outlet; 3. Booster pump; 4. First pipeline; 5. Second pipeline; 51. Connecting section; 52. Lifting section; 53. Discharging section; 54. Liquid level switch; 6. Filter; 7. Shut-off valve; 8. Check valve; 9. Flow meter. DETAILED DESCRIPTION

[0022] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] An alkaline liquid circulation hydrogen production device provided as an embodiment of the utility model includes a gas-liquid separator 1, an electrolyzer 2, a booster pump 3 and a check assembly. The bottom end of the gas-liquid separator 1 is provided with a separation outlet 11, the top end of the gas-liquid separator 1 is provided with a separation inlet 12, the bottom end of the electrolyzer 2 is provided with a liquid inlet 21, the top end of the electrolyzer 2 is provided with a gas-liquid outlet 22, the separation outlet 11 is connected to the liquid inlet 21 through a first pipeline 4, the booster pump 3 and the check assembly are arranged on the first pipeline 4, the gas-liquid outlet 22 is connected to the separation inlet 12 through a second pipeline 5, the top end of the second pipeline 5 is higher than the gas-liquid outlet 22, the bottom end of the gas-liquid separator 1 is lower than the top end of the electrolyzer 2, and the liquid flows back to the gas-liquid separator 1 through the second pipeline 5 after passing through the gas-liquid separator 1, the first pipeline 4 and the electrolyzer 2 to form a circulation.

[0027] When the booster pump 3 stops working, considering that the liquid level in the separator may be lower than the highest point of the electrolytic cell 2, the check assembly on the first pipeline 4 prevents the liquid in the electrolytic cell 2 from flowing back to the separator, causing a gas phase space to form on the upper part of the electrolytic cell 2. The top of the second pipeline 5 is higher than the gas-liquid outlet 22, so that a certain amount of alkali liquid is stored in the second pipeline 5 to supplement the liquid level drop caused by the gas precipitation of the electrolytic cell 2 due to long-term standing. While ensuring that the electrolytic cell 2 is always full of liquid, the height of the gas-liquid separator 1 is reduced, solving the problem of excessive skid height in the existing device, and reducing transportation difficulty and transportation cost.

[0028] Specifically, the second pipeline 5 includes a connecting section 51, an elevated section 52 and a drainage section 53 which are connected in sequence. The end of the connecting section 51 is connected to the gas-liquid outlet 22 and is arranged in parallel with the gas-liquid outlet 22. The elevated section 52 is arranged in a direction higher than the connecting section 51. The drainage section 53 connects the elevated section 52 and the separation inlet 12. A certain amount of alkali liquid is stored in the elevated section 52, which can replenish the liquid level drop caused by the long-term standing of the electrolytic cell 2 due to the precipitation of gas. A liquid level switch 54 is provided in the connecting section 51 or the elevated section 52. The liquid level switch 54 is provided in the connecting section 51 or the elevated section 52, which can indirectly detect whether the electrolytic cell 2 is full of liquid. A flow meter 9 is provided on the first pipeline 4 to detect the flow rate of the liquid.

[0029] Furthermore, the water electrolysis hydrogen production device also includes a filter 6 , and the filter 6 is arranged on the first pipeline 4 .

[0030] Specifically, the check assembly is arranged between the booster pump 3 and the electrolytic cell 2, and the filter 6 is arranged between the booster pump 3 and the check assembly. The check assembly includes a cut-off valve 7 and a check valve 8 connected in sequence, and the fluid in the first pipeline 4 first flows through the check valve 8 and then flows through the cut-off valve 7. The check assembly is arranged at the downstream position of the first pipeline 4 to prevent the liquid from flowing back from various upstream components. If the check assembly is arranged at the upstream position of the first pipeline 4, the filter 6 is prone to backflow and cause blockage.

[0031] Furthermore, the gas-liquid separator 1 is a plurality of groups, the first pipeline 4 includes a plurality of first branches, the first branches are connected to the separation outlets 11 of the corresponding gas-liquid separators 1, and the second pipeline 5 includes a plurality of second branches, the second branches are connected to the separation inlets 12 of the corresponding gas-liquid separators 1. In this embodiment, the gas-liquid separator 1 is mainly used to collect hydrogen, that is, the cathode position of the electrolyzer 2 is connected to the gas-liquid separator 1. In addition, the anode position of the electrolyzer 2 will produce oxygen under the action of electrolysis, and the oxygen also needs to be collected by a collecting device. The collecting device and the collecting method are consistent with the above-mentioned hydrogen collection method, so they are omitted.

[0032] In this embodiment, hydrogen is produced by the following steps:

[0033] First, the electrolytic cell 2 and the gas-liquid separator 1 are filled with alkaline liquid. The electrolytic cell 2 generates hydrogen under the action of electrolysis. The mixture of hydrogen and liquid enters the gas-liquid separator 1 through the second pipeline 5 for separation. The gas is discharged through the exhaust port of the gas-liquid separator 1. The alkaline liquid enters the booster pump 3 from the separation outlet 11 of the gas-liquid separator 1. After being pressurized by the booster pump 3, it enters the liquid inlet 21 at the bottom of the electrolytic cell 2 through the filter 6 and the flowmeter 9, and then enters the gas-liquid separator 1 from the gas-liquid outlet 22 at the top of the electrolytic cell 2 to form a cycle.

[0034] After the electrolytic cell 2 stops working, the booster pump 3 continues to work to fully separate the gas dissolved in the alkali solution in the electrolytic cell 2 device in the gas-liquid separator 1. When the booster pump 3 stops working, considering that the liquid level in the separator may be lower than the highest point of the electrolytic cell 2, a check valve 8 and a cut-off valve 7 are set in the pipeline from the booster pump 3 to the electrolytic cell 2 to prevent the liquid in the electrolytic cell 2 from flowing back to the separator, causing the formation of a gas phase space in the upper part of the electrolytic cell 2. The top of the second pipeline 5 is higher than the gas-liquid outlet 22, so that a certain amount of alkali solution is stored in the second pipeline 5 to supplement the liquid level drop caused by the long-term standing of the electrolytic cell 2 due to the precipitation of gas.

[0035] The water electrolysis hydrogen production device in the present application reduces the height of the gas-liquid separator 1 while ensuring that the electrolytic cell 2 is always full of liquid, thereby solving the problem of excessive skid height in the existing device and reducing the difficulty and cost of transportation.

[0036] The embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An alkaline solution circulation hydrogen production device, characterized in that: The invention comprises a gas-liquid separator (1), an electrolytic cell (2), a booster pump (3) and a check assembly, wherein the bottom end of the gas-liquid separator (1) is provided with a separation outlet (11), the top end of the gas-liquid separator (1) is provided with a separation inlet (12), the bottom end of the electrolytic cell (2) is provided with a liquid inlet (21), the top end of the electrolytic cell (2) is provided with a gas-liquid outlet (22), the separation outlet (11) is connected to the liquid inlet (21) via a first pipeline (4), the booster pump (3) and the The check assembly is arranged on the first pipeline (4); the gas-liquid outlet (22) is connected to the separation inlet (12) via a second pipeline (5); the top end of the second pipeline (5) is higher than the gas-liquid outlet (22); the bottom end of the gas-liquid separator (1) is lower than the top end of the electrolytic cell (2); the liquid passes through the gas-liquid separator (1), the first pipeline (4), and the electrolytic cell (2), and then flows back to the gas-liquid separator (1) via the second pipeline (5) to form a circulation.

2. The alkaline solution circulation hydrogen production device according to claim 1, characterized in that: The second pipeline (5) comprises a connecting section (51), a rising section (52) and a drainage section (53) which are connected in sequence, the end of the connecting section (51) being connected to the gas-liquid outlet (22) and being arranged in parallel with the gas-liquid outlet (22), the rising section (52) being arranged in a direction higher than the connecting section (51), and the drainage section (53) connecting the rising section (52) and the separation inlet (12).

3. The alkaline solution circulation hydrogen production device according to claim 2, characterized in that: A liquid level switch (54) is provided in the connecting section (51) or the rising section (52).

4. The alkaline solution circulation hydrogen production device according to claim 1, characterized in that: It also comprises a filter (6), wherein the filter (6) is arranged on the first pipeline (4).

5. The alkaline solution circulation hydrogen production device according to claim 4, characterized in that: The non-return assembly is arranged between the booster pump (3) and the electrolytic cell (2), and the filter (6) is arranged between the booster pump (3) and the non-return assembly.

6. The alkaline solution circulation hydrogen production device according to claim 5, characterized in that: The non-return assembly comprises a cut-off valve (7) and a non-return valve (8) which are connected in sequence, and the fluid in the first pipeline (4) first flows through the non-return valve (8) and then flows through the cut-off valve (7).

7. The alkaline solution circulation hydrogen production device according to claim 1, characterized in that: A flow meter (9) is provided on the first pipeline (4).

8. The alkaline solution circulation hydrogen production device according to claim 1, characterized in that: The gas-liquid separators (1) are in multiple groups, the first pipeline (4) includes multiple first branches, the first branches are connected to the corresponding separation outlets (11) of the gas-liquid separators (1), and the second pipeline (5) includes multiple second branches, the second branches are connected to the corresponding separation inlets (12) of the gas-liquid separators (1).

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