CN216838211U - A multi-stage PEM electrolyzer structure for water electrolysis - Google Patents

Abstract

The utility model discloses a multistage PEM electrolysis trough structure for brineelectrolysis, including lower end plate (1) and upper end plate (4) that have water entry (2) and export (3) stack is provided with at least two sets of unit mechanism between lower end plate (1) and upper end plate (4), every two sets of unit mechanism subtend sets up, and is provided with bipolar plate (14) between the adjacent unit mechanism, it is fixed through bolt (5) between lower end plate (1), unit mechanism and upper end plate (4). The utility model has the advantages of simple structure, use reliably, low cost adopt its effectual collapse that prevents the channel, avoided the emergence of runner blocking phenomenon, simultaneously, still improved sealed effect, prevented the emergence of the mutual cluster problem of hydrogen and oxygen, guaranteed the normal operating of electrolysis trough.

Description

A multi-stage PEM electrolyzer structure for water electrolysis

technical field

The utility model relates to a hydrogen production technology from electrolyzed water, in particular to a multi-stage PEM electrolytic cell structure for electrolyzed water.

Background technique

At present, the PEM pure water hydrogen production electrolyzer is composed of two end plates and bolts to sequentially and symmetrically stack the sealing insulating gasket, the titanium electrode plate, the supporting water-conducting layer, the sealing frame of the water-conducting layer and the titanium felt current collector on the coated catalyst. On both sides of the proton membrane electrode, an electrolysis unit is formed, and then direct current is applied to the electrode plate to electrolyze pure water to produce hydrogen and oxygen. When the electrolytic cells are connected in series with multiple units, the holes for water and gas on each layer of components are stacked together to form a common flow channel. In order to allow the water and gas in the common flow channel to enter and exit the supporting water-conducting layer and finally spread to the titanium felt through the titanium felt On the membrane electrode, it is necessary to engrave one or more thin communication grooves inward on the water passage hole of the water-conducting layer sealing frame, but since the water-conducting layer sealing frame is usually made of soft materials such as PTFE and silica gel After the groove is locked, it is easy to cause the channel to collapse and cause the flow channel to be blocked. In addition, when the water is electrolyzed to produce gas, the local air pressure is very high, and the local thickness of the sealing frame is thinned by the slotting. When the pressure is slightly larger, the position of the channel cannot provide a reliable seal, which causes the hydrogen and oxygen gases to be intertwined, which affects the electrolytic cell. normal function.

Utility model content

The purpose of the utility model is to provide a multi-stage PEM electrolytic cell structure for electrolyzing water which can effectively prevent the blockage of the flow channel and has reliable sealing.

The purpose of the present utility model is achieved through such a technical solution, a multi-stage PEM electrolytic cell structure for electrolyzing water, comprising a lower end plate and an upper end plate with a water inlet and an outlet, in the lower end plate and the upper end plate At least two groups of unit mechanisms are superimposed therebetween, and each two groups of unit mechanisms are arranged oppositely, and a bipolar plate is arranged between adjacent unit mechanisms, and the lower end plate, the unit mechanism and the upper end plate are fixed by bolts.

Wherein, the unit mechanism includes a sealing insulating pad, a polar plate, a supporting water-conducting layer, a water-conducting layer sealing pad A, a collector electrode, a membrane electrode, a current collector, a water-conducting layer sealing pad B and a support, which are stacked in sequence from bottom to top. water-conducting layer.

Further described, the supporting water-conducting layer includes a coarse mesh and/or a fine mesh.

It is further described that water gas ports are provided at the edges of the water-conducting layer gasket A and the water-conducting layer gasket B; The inner side of the groove is provided with a semicircular groove, and the coarse mesh, the fine mesh and the current collector are all located in the groove.

In the present invention, there are two semi-circular grooves, and the two semi-circular grooves are located at both ends of the inner side of the groove, respectively. The grooves are not on the same axis.

Further, two groups of water inlet and outlet air holes are symmetrically arranged on both ends of the polar plate and the bipolar plate, and comb-shaped communication grooves are arranged on the water inlet and outlet air holes and toward the inner direction; the polar plate and the bipolar plate It is made of titanium material and has high strength, which effectively prevents the communication groove from collapsing and blocking the flow channel after being laminated and locked.

Wherein, the groove width of the comb-tooth-shaped communication groove is 0.2-5 mm.

The polar plate is arranged on the lower end face of the water-conducting layer gasket A; the bipolar plate is arranged on the upper end face of the water-conducting layer gasket B; There is a distance L ₁ and a distance L ₂ between the tooth-shaped communication groove and the semicircular groove of the water-conducting layer gasket. Due to the existence of L ₁ , the gas generated on one side of the membrane electrode surface can enter the common pipeline formed by the water inlet and outlet holes through the comb-tooth-shaped communication groove. Because the semicircular grooves of the water-conducting layer gasket A and the water-conducting layer gasket B on both sides of the membrane electrode are not _on the same axis, and due to the existence of the distance L2. As a result, the comb-shaped communication groove on the other side of the membrane surface cannot be connected to the groove of the water-conducting layer gasket, so the gas generated on the other side of the membrane surface cannot enter and exit the same public pipeline, thus effectively isolating hydrogen and oxygen gas. intertwined.

It is further described that the edges of the sealing insulating pad, the polar plate and the bipolar plate are all provided with water inlet and outlet holes, and the water inlet and outlet holes are stacked together with the water inlet and the water inlet and outlet on the upper end plate to form at least three common lines. pipes, and at least two common pipes are used for water and oxygen in and out, and at least one common pipe is used for water and hydrogen in and out.

Further, water inlet and outlet holes are provided on the lower end plate.

In the present invention, the material of the water-conducting layer sealing pad A and the water-conducting layer sealing pad B is silica gel or PTFE.

Due to the adoption of the above technical solutions, the utility model has the advantages of simple structure, reliable use and low cost. The utility model can effectively prevent the collapse of the channel, avoid the occurrence of blockage of the flow channel, and at the same time, improve the sealing effect. It prevents the occurrence of the problem of hydrogen and oxygen intertwined, and ensures the normal operation of the electrolyzer.

Description of drawings

The accompanying drawings of the present utility model are described as follows:

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the split structure schematic diagram of the present utility model;

3 is a cross-sectional view of a multi-stage electrolytic cell of the present invention;

Fig. 4 is the structural representation of the pole plate in the utility model;

Fig. 5 is the structural representation of the bipolar plate in the utility model;

6 is a schematic structural diagram of the water-conducting layer gasket A in the utility model;

FIG. 7 is a schematic diagram of the matching mechanism between the water-conducting layer gasket A and the electrode plate in the present invention;

FIG. 8 is a water flow diagram of the present invention.

Detailed ways

The specific embodiments of the present utility model will be described in further detail below in conjunction with the accompanying drawings, but the present utility model is not limited to these embodiments, and any improvement or substitution in the basic spirit of the present embodiment still belongs to the claims of the present utility model. Scope of protection claimed.

Example 1: As shown in Figures 1, 2, and 3, a multi-stage PEM electrolytic cell structure for electrolyzing water, comprising a lower end plate 1 and an upper end plate 4 with a water inlet 2 and an outlet 3, at the lower end At least two groups of unit mechanisms are superimposed between the plate 1 and the upper end plate 4, each two groups of unit mechanisms are oppositely arranged, and a bipolar plate 14 is arranged between adjacent unit mechanisms. The lower end plate 1, the unit mechanism and the upper end The plates 4 are fixed by bolts 5.

The unit mechanism includes a sealing insulating pad 6, a polar plate 7, a supporting water-conducting layer 8, a water-conducting layer sealing pad A9, a collector electrode 10, a membrane electrode 11, a current collector 12, a water conducting layer and Layer gasket B13 and bipolar plate 14.

Wherein, the supporting water-conducting layer includes a coarse mesh 15 and/or a fine mesh 16 .

As shown in Figures 4, 5, 6, 7, and 8, water gas ports 21 are provided on the edges of the water-conducting layer gasket A9 and the water-conducting layer gasket B13, and the water-conducting layer gasket A9 and the water-conducting layer The center of the gasket B13 is provided with a groove 19 , and a semicircular groove 20 is provided on the inner side of the groove. The coarse mesh 15 , the fine mesh 16 and the current collector 12 are all located in the groove 19 .

Wherein, there are two semicircular grooves 20 , and the two semicircular grooves 20 are respectively located at the inner ends of the groove 19 , and after lamination, the two semicircular grooves on the water conducting layer gasket A9 and the water conducting layer gasket B13 20 is not on the same axis.

Wherein, two sets of water inlet and outlet holes 17 are symmetrically arranged on both ends of the polar plate 7 and the bipolar plate 14 , and comb-shaped communication grooves 18 are arranged on the inlet and outlet water holes 17 and toward the inner direction.

In the present invention, the groove width of the comb-tooth-shaped communication groove 18 is 0.2-5 mm.

In order to effectively prevent the mutual stringing of hydrogen and oxygen, the polar plate 7 is arranged on the lower end surface of the water-conducting layer gasket A9; the bipolar plate 14 is arranged on the upper end surface of the water-conducting layer gasket B13; the polar plate 7 There is a distance L ₁ and a distance L ₂ between the comb-shaped communication groove 18 on the bipolar plate 14 and the semicircular groove 20 on the water-conducting layer gasket A9 and the outer edge of the polar plate; the comb-shaped communication groove 18 on the bipolar plate 14 is connected to the guide There is a distance L ₁ and a distance L ₂ between the semicircular groove 20 on the water layer gasket B13 and the outer edge of the bipolar plate.

Wherein, the edges of the sealing insulating pad 6 , the pole plate 7 and the bipolar plate 14 are all provided with water inlet and outlet holes 17 , and the water inlet and outlet holes 21 and the water inlet 2 on the upper end plate 4 are overlapped with each other. And the outlet 3 constitutes at least three common pipes, and at least two common pipes are used for entering and leaving water and oxygen, and at least one common pipe is used for entering and leaving water and hydrogen.

For further description, water inlet and outlet air holes 17 are provided on the lower end plate 1 .

In the present invention, the material of the water-conducting layer sealing pad A9 and the water-conducting layer sealing pad B13 is silica gel or PTFE.

The utility model works as follows: the pure water system is connected to the water inlet 2 of the electrolytic cell, and direct current is applied to the two electrodes; the pure water is electrolyzed under the action of direct current, and hydrogen is separated out on both sides of the membrane electrode 11 respectively. and oxygen, the separated gas and reaction water pass through the current collector 10, the supporting water-conducting layer 8, the groove 19 on the water-conducting layer gasket A9, the semicircular groove 20, and the comb-shaped communication groove 18 on the polar plate 7 in turn, It enters into the common pipeline formed by the stacking of various components, and completes the communication with the external water and gas system. Since the semicircular grooves 20 of the water-conducting layer gasket A9 on both sides of the membrane electrode and the water-conducting layer gasket B13 are not on the same axis, and there are two gaps between the comb-tooth-shaped communication groove 18 on the electrode plate 7 and the water-conducting layer gasket A9 There are two distances L ₁ and L ₂ , so the same membrane surface can only communicate with hydrogen or oxygen, and the two gases cannot be connected to each other, thus realizing the reliable separation of gases.

By comparison, it is found that the electrolytic cell assembled by the utility model can still maintain a reliable seal when the gas pressure on both sides is 0.5Mpa, and hydrogen and oxygen are not interlinked.

Claims (10)

1. A multi-stage PEM electrolyser structure for the electrolysis of water, comprising a lower end plate (1) and an upper end plate (4) with water inlet (2) and outlet (3), characterized in that: at least two groups of unit mechanisms are arranged between the lower end plate (1) and the upper end plate (4) in a superposed mode, every two groups of unit mechanisms are arranged in an opposite mode, a bipolar plate (14) is arranged between every two adjacent unit mechanisms, and the lower end plate (1), the unit mechanisms and the upper end plate (4) are fixed through bolts (5).

2. A multi-stage PEM electrolyser structure for electrolyzing water as claimed in claim 1 wherein: the unit mechanism comprises a sealing insulating pad (6), a polar plate (7), a supporting water guide layer (8), a water guide layer sealing pad A (9), a collector electrode (10), a membrane electrode (11), a current collector (12), a water guide layer sealing pad B (13) and a supporting water guide layer which are sequentially stacked from bottom to top.

3. A multi-stage PEM electrolyser construction for electrolyzing water as in claim 2 wherein: the supporting water-guiding layer comprises a coarse mesh (15) and/or a fine mesh (16).

4. A multi-stage PEM electrolyser structure for electrolyzing water as claimed in claim 3 wherein: the edge of the water guide layer sealing gasket A (9) and the edge of the water guide layer sealing gasket B (13) are both provided with a water gas port (21), the centers of the water guide layer sealing gasket A (9) and the water guide layer sealing gasket B (13) are both provided with a groove (19), the inner side of the groove is provided with a semicircular groove (20), and the coarse net (15), the fine net (16) and the current collector (12) are all positioned in the groove (19).

5. A multi-stage PEM electrolyser structure for electrolyzing water as claimed in claim 4 wherein: the number of the semicircular grooves (20) is two, the two semicircular grooves (20) are respectively positioned at two ends of the inner side of the groove (19), and after the two semicircular grooves are overlapped, the two semicircular grooves (20) on the water guide layer sealing gasket A (9) and the water guide layer sealing gasket B (13) are positioned on different axes.

6. A multi-stage PEM electrolyser structure for electrolyzing water as claimed in claim 5 wherein: two groups of water inlet and outlet air holes (17) are symmetrically arranged at two ends of the polar plate (7) and the bipolar plate (14), and comb-shaped communicating grooves (18) are arranged on the water inlet and outlet air holes (17) and in the inward direction.

7. A multi-stage PEM electrolyser structure for electrolyzing water as claimed in claim 6 wherein: the width of the comb-shaped communicating groove (18) is 0.2-5 mm.

8. A multi-stage PEM electrolyzer structure for electrolyzing water as recited in claim 7 further characterized by: the polar plate (7) is arranged on the lower end face of the water guide layer sealing gasket A (9); the bipolar plate (14) is arranged on the upper end face of the water guide layer sealing gasket B (13); a distance L is arranged between the comb-shaped communication groove (18) on the polar plate (7) and the semi-circular groove (20) on the water guide layer sealing gasket A (9) and the outer edge of the polar plate₁And a spacing L₂(ii) a A distance L is arranged between the comb-shaped communication groove (18) on the bipolar plate (14), the semicircular groove (20) on the water guide layer sealing gasket B (13) and the outer edge of the bipolar plate₁And a spacing L₂。

9. A multi-stage PEM electrolyzer structure for electrolyzing water as recited in claim 8 further characterized by: the edges of the sealing insulating pad (6), the polar plate (7) and the bipolar plate (14) are all provided with water inlet and outlet air holes (17), the water inlet and outlet air holes, after being laminated, form at least three public pipelines with a water inlet (2) and an outlet (3) on the upper end plate (4) and a water and air port (21), at least two public pipelines are used for water inlet and outlet and oxygen, and at least one public pipeline is used for water inlet and outlet and hydrogen inlet and outlet.

10. A multi-stage PEM electrolyser construction for electrolyzing water as in claim 9 wherein: and the lower end plate (1) is provided with water inlet and outlet air holes (17).

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