Integrated plastic pole frame polar plate with pressure and flow adjusting structure and electrolytic bath

Abstract

The invention discloses an integrated plastic pole frame polar plate with a pressure and flow adjusting structure and an electrolytic bath, and belongs to the technical field of water electrolysis hydrogen production equipment. The integrated plastic pole frame polar plate comprises a pole frame body and a polar plate integrally formed with the pole frame body, and a plurality of metal sheets with pressure and flow adjusting structures are embedded in the polar plate; the adjusting structure is a concave notch and is arranged at the top of the metal sheet, or the adjusting structure is a through hole and is arranged in the middle of the metal sheet. The electrolytic bath comprises end pressing plates and a plurality of electrolytic cells which are arranged between the end pressing plates and are connected in series; the small electrolysis chamber comprises the integrated plastic electrode frame polar plate. The structures capable of adjusting the pressure and the flow are arranged on the metal sheets of the integrated plastic electrode frame polar plate and used for automatically adjusting the pressure and the flow between the adjacent metal sheets in the electrolyte flowing process, so that the hydrogen production effect of the electrolytic cell is improved; the technical problems of uneven pressure, uneven hydrogen and oxygen production, uneven temperature, reduction of electrolysis efficiency and the like caused by uneven flow in an existing electrolytic cell are effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of water electrolysis hydrogen production equipment, and in particular to an integrated plastic pole frame pole plate and an electrolytic cell with a pressure and flow regulating structure. Background Art

[0002] At present, the main methods of producing hydrogen by water electrolysis include alkaline water electrolysis (AWE / ALK), proton exchange membrane (PEM) water electrolysis, high-temperature solid oxide (SOEC) water electrolysis, and solid polymer anion exchange membrane (AEM) water electrolysis. Among them, AWE is the earliest industrialized water electrolysis technology, with decades of application experience and the most mature; PEM water electrolysis technology has developed rapidly in recent years; SOEC water electrolysis technology is in the initial demonstration stage; and AEM water electrolysis research has just started. At present, the main water electrolysis hydrogen production technologies that can be practically applied are AWE and PEM, while SOEC electrolysis and AEM electrolysis are still in the early demonstration and research and development stages, respectively.

[0003] Among them, the electrolyzer is the core equipment in the process of hydrogen production by alkaline water electrolysis. However, the number and position of the inlet and outlet of the electrolysis chamber in the existing battery tank equipment are limited, so there are areas close to the inlet and outlet lines and areas far away from the inlet and outlet lines. Fluid flow also follows the principle that the straight line between two points is the shortest, so the flow rate in the area of ​​the inlet and outlet lines is relatively large, while the flow rate in other areas is relatively small. The uneven flow causes uneven pressure, uneven hydrogen and oxygen production, uneven temperature, and reduced electrolysis efficiency, resulting in low reaction efficiency of the electrolyzer and poor hydrogen production effect. Summary of the invention

[0004] Purpose of the invention: The first purpose of the present invention is to provide an integrated plastic pole frame and plate with a pressure and flow regulating structure. The second purpose of the present invention is to provide an electrolytic cell comprising the above-mentioned integrated plastic pole frame and plate with a pressure and flow regulating structure.

[0005] Technical solution: The integrated plastic pole frame and pole plate with pressure and flow regulating structure provided by the present invention comprises a pole frame body and a pole plate integrally formed with the pole frame body, wherein a plurality of metal sheets with pressure and flow regulating structure are embedded in the pole plate.

[0006] Furthermore, the adjustment structure is a concave notch, which is arranged on the top of the metal sheet; or; the adjustment structure is a through hole, which is arranged in the middle of the metal sheet.

[0007] Furthermore, the adjustment structures are evenly distributed or unevenly distributed on the metal sheet.

[0008] Furthermore, the adjustment structures are staggered or co-located on adjacent metal sheets.

[0009] Furthermore, the top of the electrode plate is provided with a plurality of hydrogen outlets and a plurality of oxygen outlets, the bottom of the electrode plate is provided with a plurality of alkali solution inlets, and the hydrogen outlet, oxygen outlet and alkali solution inlet are all provided with water lines.

[0010] Furthermore, the hydrogen outlet and the oxygen outlet are staggeredly distributed.

[0011] Furthermore, an inner sealing surface is provided at the junction of the pole frame body and the pole plate; and an outer sealing waterline is provided around the pole frame body.

[0012] Furthermore, the plastic pole frame body is provided with a plurality of positioning structures, and the metal sheet and the integrated plastic pole frame plate are integrally injection molded.

[0013] The electrolytic cell provided by the present invention comprises an end pressure plate and a plurality of electrolytic chambers connected in series between the end pressure plates; the electrolytic chambers comprise, from left to right, the above-mentioned integrated plastic pole frame plate, an anode electrode, a diaphragm, a cathode electrode and another above-mentioned integrated plastic pole frame plate.

[0014] Furthermore, in the electrolysis chamber, a gasket is provided between the anode electrode or cathode electrode and the integrated plastic pole frame plate.

[0015] Beneficial effects: Compared with the prior art, the present invention has the following significant effects: the present invention provides a structure capable of regulating pressure and flow on the metal sheet of the one-piece plastic pole frame and pole plate to realize automatic adjustment of the pressure and flow between adjacent metal sheets during the flow of the electrolyte, thereby improving the hydrogen production effect of the electrolyzer, and effectively solving the technical problems of uneven pressure, uneven hydrogen and oxygen production, uneven temperature, reduced electrolysis efficiency, etc. caused by uneven flow in the existing electrolyzer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of an integrated plastic pole frame and pole plate;

[0017] Figure 2 A schematic diagram of one structure of the metal sheet in Example 1;

[0018] Figure 3 is another structural schematic diagram of the metal sheet in Example 1; Figure 4 A schematic diagram of one structure of the metal sheet in Example 2; Figure 5 This is another structural schematic diagram of the metal sheet in Example 2. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the embodiments and drawings.

[0020] Embodiment 1: The electrolytic cell provided in this embodiment includes an end pressure plate and a plurality of electrolytic chambers connected in series between the end pressure plates, wherein the electrolytic chamber includes, from left to right, an integrated plastic pole frame plate, a gasket, an anode electrode, a diaphragm, a cathode electrode and another integrated plastic pole frame plate. The integrated plastic pole frame plate adopts an alkali-resistant plastic pole frame plate, such as PPU or PPSU, which has strong chemical corrosion resistance and is free of metal impurities, thereby fundamentally eliminating the risk of electrochemical corrosion, and also greatly reducing the weight, size and production cost of the device, making it easy to install, transport and maintain.

[0021] like Figure 1 As shown, the one-piece plastic pole frame and pole plate are of a rectangular structure, including a pole frame body 1 and a pole plate 2 integrally formed with the pole frame body. The top of the pole frame body 2 is provided with a plurality of hydrogen outlets 3 and a plurality of oxygen outlets 4, which are staggered, and the bottom is provided with a plurality of alkali liquid inlets 5; the hydrogen outlet 3, the oxygen outlet 4 and the alkali liquid inlet 5 are all provided with water lines 6; in order to ensure the sealing of the structure, an inner sealing surface 7 is provided between the pole frame body 1 and the pole plate 2, and an outer sealing water line 8 is provided around the pole frame body 1 to the outside, and the area between the inner sealing surface 7 and the outer sealing water line 8 is used for a gasket to prevent leakage of alkali liquid and gas, and ensure the inner and outer sealing of the electrolysis chamber; the pole plate 2 is provided with a plurality of metal sheets 9 with pressure and flow regulating structures, such as Figure 2-Figure 3 As shown, the adjustment structure is a concave notch 11, which is arranged on the top of the metal sheet 9. The concave notch 11 is evenly or unevenly distributed on the metal sheet, and is distributed in the same position or staggered on adjacent metal sheets. In order to facilitate the installation and fixation of the electrolytic chamber, a plurality of positioning structures 10 are provided on the pole frame body 1, and the positioning structures 10 are preferably symmetrically distributed.

[0022] In order to ensure the sealing of the overall structure, the metal sheet 9 and the integrated plastic pole frame and pole plate are integrally injection molded.

[0023] The working principle of the electrolyzer provided in this embodiment is as follows: the alkali solution flows into the electrolysis chamber from the alkali solution inlet 5 at the bottom of the integrated plastic pole frame plate, and then is distributed between each metal sheet 9. As the alkali solution rises, the cathode and anode continuously produce hydrogen and oxygen, and the temperature continues to rise. The mixture of hydrogen, oxygen and alkali solution reaches their respective outlets and flows out of the electrolyzer. During the working process, the plastic plate isolates the gas mixture on both sides, and the metal sheet 9 is responsible for electron transmission and providing space for the flow of alkali solution and gas. The pressure and flow regulating structure 11 on the metal sheet 9 is responsible for regulating the flow of the electrolyte and the pressure and flow between adjacent metal sheets, thereby improving the efficiency of hydrogen production by electrolysis. The overall device structure adopts the injection molding process, which eliminates the processes of processing, testing, welding, electroplating, etc., greatly simplifies the manufacturing process and reduces costs.

[0024] Embodiment 2: The difference from Embodiment 1 is that the structure of the metal sheet is different, such as Figure 4As shown, a through hole 12 is provided in the middle of the metal sheet 9. The through holes 12 are evenly distributed on the metal sheet 9 and are co-located on adjacent metal sheets. Figure 5 As shown, the through holes 12 are evenly distributed on the metal sheet 9 and staggered on adjacent metal sheets. The through holes 12 are used as a pressure and flow regulating structure to adjust the pressure and flow in the electrolytic cell while maintaining the integrity of the contact with the electrode. Compared with the concave notch in Example 1, the contact area with the electrode is increased, thereby improving the reaction efficiency to a certain extent.

Claims

1. An integrated plastic pole frame plate with a pressure and flow regulating structure, characterized in that: It comprises a pole frame body and a pole plate integrally formed with the pole frame body, wherein a plurality of metal sheets with pressure and flow regulating structures are embedded in the pole plate.

2. The integrated plastic pole frame plate with pressure and flow regulating structure according to claim 1, characterized in that: The adjustment structure is a concave notch, which is arranged on the top of the metal sheet.

3. The integrated plastic pole frame plate with pressure and flow regulating structure according to claim 1, characterized in that: The adjustment structure is a through hole, which is arranged in the middle of the metal sheet.

4. The integrated plastic pole frame plate with pressure and flow regulating structure according to claim 1, characterized in that: The adjustment structures are evenly distributed or non-evenly distributed on the metal sheet.

5. The integrated plastic pole frame plate with pressure and flow regulating structure according to claim 1, characterized in that: The regulating structures are distributed in a staggered manner or in a co-located manner on adjacent metal sheets.

6. The integrated plastic pole frame plate with pressure and flow regulating structure according to claim 1, characterized in that: The top of the electrode plate is provided with a plurality of hydrogen outlets and a plurality of oxygen outlets, the bottom of the electrode plate is provided with a plurality of alkali solution inlets, and the hydrogen outlet, oxygen outlet and alkali solution inlet are all provided with water lines; the hydrogen outlet and the oxygen outlet are staggeredly distributed.

7. The integrated plastic pole frame plate with pressure and flow regulating structure according to claim 1, characterized in that: An inner sealing surface is provided at the junction of the pole frame body and the pole plate; and an outer sealing waterline is provided around the pole frame body.

8. The integrated plastic pole frame plate with pressure and flow regulating structure according to claim 1, characterized in that: The plastic pole frame body is provided with a plurality of positioning structures; the metal sheet and the integrated plastic pole frame plate are integrally injection molded.

9. An electrolytic cell, characterized in that: It comprises an end pressure plate and a plurality of electrolysis chambers connected in series between the end pressure plates; the electrolysis chamber comprises, from left to right, the one-piece plastic pole frame plate according to any one of claims 1 to 8, an anode electrode, a diaphragm, a cathode electrode and another one-piece plastic pole frame plate according to any one of claims 1 to 8.

10. The electrolytic cell according to claim 9, characterized in that In the electrolysis chamber, a gasket is provided between the anode electrode or cathode electrode and the integrated plastic pole frame plate.

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