Small alkaline electrolytic cell for laboratory test

Abstract

The utility model discloses a small alkaline electrolytic bath for laboratory testing, and belongs to the field of water electrolysis hydrogen production. Comprising a left end pressing plate and a right end pressing plate, and a left polar plate, a diaphragm, a sealing gasket and a right polar plate are sequentially arranged between the two end pressing plates; a first flow channel is formed below the left polar plate, a first flow channel hole is formed in the first flow channel, a second flow channel is formed above the left polar plate, and a second flow channel hole is formed in the second flow channel; a third runner is formed below the right polar plate, a fourth runner is formed above the right polar plate, and a fourth runner hole is formed in the fourth runner. The surface of the left polar plate is recessed inwards to form a diaphragm placement layer, a first electrode placement layer and a first electrolysis region of which the sizes are sequentially reduced. And the surface of the right polar plate is recessed inwards to form a second electrode placement layer and a second electrolysis region of which the sizes are sequentially reduced. The small alkaline electrolytic bath for laboratory testing can achieve the effects of more uniform flow field distribution, more uniform alkali liquor heating and more accurate test results.

Description

Technical Field

[0001] The utility model relates to hydrogen production by electrolyzing water, in particular to a small alkaline electrolytic cell for laboratory testing. Background Art

[0002] With the proposal of carbon peak and carbon neutrality, the water electrolysis hydrogen production industry has seen unprecedented development. The core component of water electrolysis hydrogen production equipment is the electrolyzer, which is composed of different numbers of electrolysis chambers connected in series. A complete cell body is connected by a pull rod through an end pressure plate and multiple electrolysis chambers (containing positive and negative plates). The performance of the diaphragm and electrodes in the electrolysis chamber largely determines the efficiency of hydrogen production in the electrolyzer. When the electrolyzer is working, the electrolyte (usually KOH solution) is injected into each electrolysis chamber through the alkaline solution channel for electrolysis. At the same time, the hydrogen and oxygen produced by electrolysis will carry part of the gas liquid from each electrolysis chamber into the hydrogen and oxygen gas channels and send them out of the electrolyzer, and so on. In the prior art, the pole frame uses engineering plastic injection molding instead of metal, which greatly reduces the overall weight of the electrolyzer and reduces the cost.

[0003] Existing alkaline electrolytic cells used in laboratory tests are relatively small and cannot rely on their own structure and the heat generated by the reaction itself to heat the alkali solution to the optimal reaction temperature range. Existing electrolytic cells usually use a circulation pump to transport the alkali solution into the cell. Due to the small size of the cell, the flow rate of the input alkali solution in the electrolysis chamber is uneven, which can easily lead to uneven temperature distribution in the electrolytic cell, thereby affecting the electrolysis efficiency and reducing the accuracy of the experimental results. Summary of the Invention

[0004] Purpose of the utility model: The purpose of the utility model is to provide a small alkaline electrolytic cell for laboratory testing with more uniform flow field distribution, more uniform heating of alkali solution and more accurate test results.

[0005] Technical solution: The small alkaline electrolytic cell for laboratory testing described in the utility model includes a left end pressure plate and a right end pressure plate, and a left pole plate, a diaphragm, a sealing gasket, and a right pole plate are sequentially arranged between the two end pressure plates; a first flow channel and a second flow channel for the flow of alkali solution are respectively opened below and above the left pole plate, a first flow channel hole is opened in the first flow channel, and a second flow channel hole is opened in the second flow channel; a third flow channel and a fourth flow channel for the flow of alkali solution are respectively opened below and above the right pole plate, and a fourth flow channel hole is opened in the fourth flow channel.

[0006] Preferably, a plurality of first positioning holes for bolts to pass through during assembly are evenly opened on the left pole plate, and the surface of the left pole plate is recessed inward to form a diaphragm placement layer, a first electrode placement layer, and a first electrolysis area with successively decreasing sizes.

[0007] Preferably, a plurality of second positioning holes for bolts to pass through during assembly are evenly provided on the right electrode plate, and the surface of the right electrode plate is recessed inward to form a second electrode placement layer and a second electrolysis area with successively decreasing sizes.

[0008] Preferably, a plurality of first through holes for bolts to pass through during assembly are evenly formed on the left end pressure plate, a liquid inlet hole is formed at the lower end, and a hydrogen side liquid outlet hole is formed at the upper end.

[0009] Preferably, a plurality of second through holes for bolts to pass through during assembly are evenly formed on the right end pressure plate, and an oxygen side liquid outlet hole is formed at the upper end.

[0010] Preferably, a first expansion net is placed in the first electrolysis zone, and the size of the first expansion net is such that it can be placed in the first electrolysis zone; a first electrode is placed in the first electrode placement layer, and the size of the first electrode is such that it can be placed in the first electrode placement layer; a diaphragm is placed in the diaphragm placement layer, and the size of the diaphragm is such that it can be placed in the diaphragm placement layer.

[0011] Preferably, an opening is provided at the center of the sealing gasket to allow the alkaline solution in the electrolytic cell to flow freely, and a fifth flow channel hole is provided below the opening.

[0012] Preferably, a second electrode is placed in the second electrode placement layer, and the size of the second electrode is such that it can be placed in the second electrode placement layer; a second expansion net is placed in the second electrolysis zone, and the size of the second expansion net is such that it can be placed in the second electrolysis zone.

[0013] Preferably, the electrolytic cell further comprises a fastening assembly, which comprises a tightening bolt, to which an insulating washer, a flat washer and a hexagonal nut are sequentially connected.

[0014] Preferably, the electrolytic cell is connected to the gas-liquid separator, the water bath, and the peristaltic pump through corresponding pipelines when in use.

[0015] Beneficial effects: Compared with the prior art, the utility model has the following significant advantages: (1) The electrolysis area of ​​the electrolytic cell is small and the number of flow channels is large and the area is small, and the flow channel arrangement is more uniform. Compared with the traditional electrolytic cell, the flow field distribution in the electrolytic cell is more uniform, so that the test results of the electrode and diaphragm performance in the electrolytic cell are more accurate; (2) The heating method is changed to water bath heating, so that the heating of the alkali solution is more uniform, and the alkali solution entering the electrolytic cell reaches the optimal reaction temperature range to ensure the maximum electrolysis efficiency, thereby better testing the performance of the electrode and diaphragm; (3) The peristaltic pump is used to stably and constantly input the alkali solution heated in the water bath into the electrolytic cell. Indoor, it can not only improve the stability and accuracy; (4) The left and right end pressure plates are made of hard plastic material, which not only reduces the cost but also reduces the weight of the entire tank body; (5) The inlet and outlet ports are both NPT threaded interfaces, which are more convenient to install than the flange interfaces used in traditional alkaline electrolytic cells; (6) The cell body of the electrolytic cell is small and does not require professional assembly tools, making assembly simpler and more convenient; (7) The electrodes on the electrolytic cell do not need to be welded and can be placed directly on the plate, which is not only convenient for assembly but also avoids experimental errors caused by welding; (8) The electrolytic cell can increase the plate as needed, thereby increasing the number of electrolysis chambers and improving electrolysis efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an exploded view of the electrolytic cell of the present invention;

[0017] Figure 2 This is an assembly diagram of the electrolytic cell of the present invention;

[0018] Figure 3 It is a structural diagram of the left end pressure plate;

[0019] Figure 4 It is a structural diagram of the right end pressure plate;

[0020] Figure 5 It is the structural diagram of the left plate;

[0021] Figure 6 It is the structural diagram of the right plate;

[0022] Figure 7 Schematic diagram of the structure of the sealing gasket;

[0023] Figure 8 is a structural diagram of a fastening assembly;

[0024] Figure 9 Schematic diagram of the structure in which the electrolytic cell is connected to the gas-liquid separator. DETAILED DESCRIPTION

[0025] The technical solution of the present utility model will be further described below in conjunction with the embodiments.

[0026] like Figure 1-8 As shown, the small alkaline electrolytic cell for laboratory testing described in the present invention includes a left end pressure plate 1 and a right end pressure plate 2, between which a left electrode plate 3, a diaphragm 7, a sealing gasket 8, and a right electrode plate 4 are sequentially arranged. A first transmission plate 39 is fixed on the top of the left electrode plate 3, and a second transmission plate 49 is fixed on the top of the right electrode plate 4; a first flow channel 36 for the flow of alkali solution is opened below the left electrode plate 3, and a first flow channel hole 35 is opened in the first flow channel 36; a second flow channel 37 for the flow of alkali solution is opened above the left electrode plate 3, and a second flow channel hole 38 is opened in the second flow channel 37; a third flow channel 44 for the flow of alkali solution is opened below the right electrode plate 4, and a fourth flow channel 45 for the flow of alkali solution is opened above the right electrode plate 4, and a fourth flow channel 45 is opened in the fourth flow channel 45.

[0027] Four first positioning holes 31 for bolts to pass through during assembly are evenly formed on the left electrode plate 3. The surface of the left electrode plate 3 is recessed inward to form a diaphragm placement layer 32, a first electrode placement layer 33, and a first electrolysis area 34 with successively decreasing sizes.

[0028] Three second positioning holes 41 for bolts to pass through during assembly are evenly formed on the right electrode plate 4. The surface of the right electrode plate 4 is recessed inward to form a second electrode placement layer 42 and a second electrolysis area 43 of successively decreasing sizes.

[0029] Eight first through holes 101 are evenly formed on the left end pressure plate 1 for bolts to pass through during assembly, a liquid inlet hole 102 is formed at the lower end, and a hydrogen side liquid outlet hole 13 is formed at the upper end.

[0030] Eight second through holes 21 are evenly formed on the right end pressure plate 2 for bolts to pass through during assembly, and an oxygen side liquid outlet hole 22 is formed on the upper end.

[0031] The positions of the four first positioning holes 31 , the four second positioning holes 41 , the four first through holes 101 and the four second through holes 21 correspond to each other so that the tightening bolts 111 can pass through, thereby completing the assembly of the components.

[0032] A first expansion net 5 is placed in the first electrolysis zone 34 , and the size of the first expansion net 5 is such that it can be placed in the first electrolysis zone 34 .

[0033] The first electrode 6 is placed in the first electrode placement layer 33 , and the size of the first electrode 6 is such that it can be placed in the first electrode placement layer 33 .

[0034] The diaphragm 7 is placed in the diaphragm placement layer 32 , and the size of the diaphragm 7 is based on the size that can be placed in the diaphragm placement layer 32 .

[0035] An opening 81 is provided at the center of the sealing gasket 8 to allow the alkaline solution in the electrolytic cell to flow freely. A fifth flow channel hole 82 is provided below the opening 81 . The opening 81 is square.

[0036] The second electrode 9 is placed in the second electrode placement layer 42 , and the size of the second electrode 9 is such that it can be placed in the second electrode placement layer 42 .

[0037] A second expansion net 10 is placed in the second electrolysis zone 43 , and the size of the second expansion net 10 is such that it can be placed in the second electrolysis zone 43 .

[0038] The diaphragm placement layer 32 , the first electrode placement layer 33 , the first electrolysis zone 34 , the second electrode placement layer 42 , and the second electrolysis zone 43 are all square.

[0039] The electrolytic cell further includes a fastening assembly 11 , which includes a tightening bolt 111 , to which an insulating washer 112 , a flat washer 113 and a hexagonal nut 114 are sequentially connected.

[0040] like Figure 2 As shown, the tightening bolt 111 passes through the positioning holes and through holes on the left end pressure plate 1, the left pole plate 3, the right pole plate 4, and the right end pressure plate 2 in sequence, and is then fixed by the insulating gasket 112, the flat gasket 113, and the hexagonal nut 114 to assemble the various components of the electrolytic cell together.

[0041] like Figure 9 As shown, when the electrolytic cell 12 is in operation, it is connected to the gas-liquid separator 16 , the water bath 14 , and the peristaltic pump 15 through corresponding pipelines.

[0042] The electrolytic cell of the present invention operates as follows: First, alkaline solution is placed in a water bath 14 and heated. When the temperature of the alkaline solution reaches a specified temperature range, the alkaline solution is pumped into the electrolytic cell 12 via a peristaltic pump 15. The alkaline solution first enters the electrolytic cell 12 through the liquid inlet 12. A portion of the alkaline solution enters the first flow channel 36 through the first flow channel 35, then flows along the first flow channel 36 into the first electrolysis zone 34, where it then reacts. After the reaction is complete, the alkaline solution and the gas mixture produced by the reaction flow along the second flow channel 37 into the second flow channel 38, then flows out of the hydrogen-side liquid outlet 13 and into the gas-liquid separator 16. After separation, the alkaline solution flows back into the water bath 14. Another portion of the alkaline solution enters the third flow channel 44 through the fifth flow channel 82, then flows along the third flow channel 44 into the second electrolysis zone 43, where the alkaline solution reacts. After the reaction is completed, the alkali solution and the gas mixture produced by the reaction flow along the fourth flow channel 45 into the fourth flow channel hole 46, then out of the oxygen-side liquid outlet 22 and into the gas-liquid separator 16. The separated alkali solution flows back into the water bath 14, and then the alkali solution in the water bath 14 is again input into the electrolysis chamber through the peristaltic pump 15.

Claims

1. A small alkaline electrolytic cell for laboratory testing, comprising a left end pressure plate (1) and a right end pressure plate (2), wherein a left electrode plate (3), a diaphragm (7), a sealing gasket (8), and a right electrode plate (4) are sequentially arranged between the two end pressure plates; characterized in that: A first flow channel (36) and a second flow channel (37) for the flow of alkali solution are respectively provided below and above the left electrode (3), a first flow channel hole (35) is provided in the first flow channel (36), and a second flow channel hole (38) is provided in the second flow channel (37); a third flow channel (44) and a fourth flow channel (45) for the flow of alkali solution are respectively provided below and above the right electrode (4), and a fourth flow channel hole (46) is provided in the fourth flow channel (45).

2. The small alkaline electrolytic cell for laboratory testing according to claim 1, characterized in that: The left pole plate (3) is evenly provided with a plurality of first positioning holes (31) for bolts to pass through during assembly. The surface of the left pole plate (3) is recessed inward to form a diaphragm placement layer (32), a first electrode placement layer (33), and a first electrolysis zone (34) of successively decreasing sizes.

3. The small alkaline electrolytic cell for laboratory testing according to claim 1, characterized in that: The right pole plate (4) is evenly provided with a plurality of second positioning holes (41) for bolts to pass through during assembly. The surface of the right pole plate (4) is recessed inward to form a second electrode placement layer (42) and a second electrolysis zone (43) of successively decreasing sizes.

4. The small alkaline electrolytic cell for laboratory testing according to claim 1, characterized in that: The left end pressure plate (1) is evenly provided with a plurality of first through holes (101) for bolts to pass through during assembly, a liquid inlet hole (102) is provided at the lower end, and a hydrogen side liquid outlet hole (13) is provided at the upper end.

5. The small alkaline electrolytic cell for laboratory testing according to claim 1, characterized in that: The right end pressure plate (2) is evenly provided with a plurality of second through holes (21) for bolts to pass through during assembly, and an oxygen side liquid outlet hole (22) is provided at the upper end.

6. The small alkaline electrolytic cell for laboratory testing according to claim 2, characterized in that: A first expansion net (5) is placed in the first electrolysis zone (34), and the size of the first expansion net (5) is based on the ability to be placed in the first electrolysis zone (34); a first electrode (6) is placed in the first electrode placement layer (33), and the size of the first electrode (6) is based on the ability to be placed in the first electrode placement layer (33); a diaphragm (7) is placed in the diaphragm placement layer (32), and the size of the diaphragm (7) is based on the ability to be placed in the diaphragm placement layer (32).

7. The small alkaline electrolytic cell for laboratory testing according to claim 1, characterized in that: The center of the sealing gasket (8) is provided with an opening (81) for allowing the alkali solution inside the electrolytic cell to flow freely, and a fifth flow channel hole (82) is provided below the opening (81).

8. The small alkaline electrolytic cell for laboratory testing according to claim 3, characterized in that: A second electrode (9) is placed in the second electrode placement layer (42), and the size of the second electrode (9) is based on the ability to be placed in the second electrode placement layer (42); a second expansion net (10) is placed in the second electrolysis zone (43), and the size of the second expansion net (10) is based on the ability to be placed in the second electrolysis zone (43).

9. The small alkaline electrolytic cell for laboratory testing according to claim 1, characterized in that: The electrolytic cell (12) further comprises a fastening assembly (11), wherein the fastening assembly (111) comprises a tightening bolt (111), and an insulating gasket (112), a flat gasket (113) and a hexagonal nut (114) are sequentially connected to the tightening bolt (111).

10. The small alkaline electrolytic cell for laboratory testing according to claim 1, characterized in that: When in operation, the electrolytic cell (12) is connected to the gas-liquid separator (16), the water bath (14), and the peristaltic pump (15) through corresponding pipelines.

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