Pole frame of flow field alkaline water electrolysis bath

Abstract

The invention discloses a flow field alkaline water electrolytic bath pole frame which comprises a circular body, a plurality of hydrogen liquid gas passage holes and oxygen liquid gas passage holes are evenly formed in the body in the circumferential direction of the body in a staggered mode, each hydrogen liquid gas passage hole is correspondingly connected with a hydrogen liquid gas passage groove, the hydrogen liquid gas passage grooves are formed in the surface of the body, each oxygen liquid gas passage hole is correspondingly connected with an oxygen liquid gas passage groove, and the oxygen liquid gas passage holes are communicated with the oxygen liquid gas passage grooves. The oxygen liquid air channel groove is formed in the surface of the body, the body is further provided with an electrode liquid channel assembly, and the outer edge of the body is connected with a sealing waterline in the circumferential direction of the body. According to the invention, the hydrogen liquid gas passage hole, the oxygen liquid gas passage hole, the hydrogen liquid gas passage groove, the oxygen liquid gas passage groove, the electrolyte catholyte passage hole, the electrolyte anolyte passage hole, the electrolyte catholyte passage groove, the electrolyte anolyte passage groove, the electrolyte liquid inlet hole passage and other passages which are mutually staggered are designed, so that gas-liquid two-phase flow fields are uniformly distributed in the electrolytic cell; and rising bubbles in the small electrolysis chamber are quickly discharged, so that a gas dead zone in the small electrolysis chamber is eliminated, and the electrolyte resistance is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of water electrolysis hydrogen production equipment, and in particular relates to a flow field alkaline water electrolyzer pole frame. Background Art

[0002] The alkaline water hydrogen production electrolyzer is the core equipment in the electrolytic water hydrogen production system. It is a device that generates hydrogen and oxygen by electrolyzing water. At present, most of the electrolyzers in the existing electrolytic water hydrogen production system adopt a bipolar filter press structure, which consists of multiple parallel electrolysis chambers, and the two ends are compressed by two end pressure plates and several tension bolts to form a compact filter press structure.

[0003] The plate assembly is the most important repetitive component in the electrolyzer. It is mainly formed by welding the pole frame and the main pole plate. The pole frame is provided with hydrogen liquid, oxygen liquid gas channel holes, liquid channel holes and positioning holes. In the prior art, two groups of gas channel holes are provided at the upper end of the pole frame, usually one group is the hydrogen liquid outlet, and the other group is the oxygen liquid outlet. The lower end of the pole frame is provided with a single electrolyte cathode and anode inlet. This structure has little effect on the internal flow field distribution of a small diameter electrolyzer, but as the diameter of the electrolyzer increases, the single electrolyte cathode and anode inlet at the lower end of the pole frame will cause a large difference in electrolyte concentration at various locations inside the electrolyzer, poor electrolyte flow disturbance performance, and large temperature differences in each electrolytic chamber; the unilateral distribution of hydrogen liquid and oxygen liquid outlets will cause uneven distribution of the gas-liquid two-phase flow field inside the electrolyzer, and the rising bubbles during the electrolysis process cannot be discharged in time, gas aggregation is formed in the electrolytic chamber, and the resistance of each electrolytic chamber increases, resulting in uneven current density of the electrolyzer and reduced electrolysis efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a flow field alkaline water electrolyzer pole frame, which solves the problem of uneven distribution of gas-liquid two-phase flow field inside the electrolyzer caused by the existing pole frame.

[0005] The technical solution adopted by the present invention is: a flow field alkaline water electrolyzer electrode frame, including a circular ring-shaped body, the body having a plurality of hydrogen-liquid gas duct holes and oxygen-liquid gas duct holes evenly and staggeredly arranged along its circumference, each hydrogen-liquid gas duct hole is correspondingly connected to a hydrogen-liquid gas duct groove, the hydrogen-liquid gas duct groove is opened on the surface of the body, each oxygen-liquid gas duct hole is correspondingly connected to an oxygen-liquid gas duct groove, the oxygen-liquid gas duct groove is opened on the surface of the body, the body is also provided with an electrode liquid channel assembly, and the outer edge of the body is connected to a sealing water line along its circumference.

[0006] The present invention is also characterized in that:

[0007] The hydrogen-liquid gas duct holes, hydrogen-liquid gas duct grooves, oxygen-liquid gas duct holes and oxygen-liquid gas duct grooves are arranged within a 130° range of the upper part of the main body, and the number of oxygen-liquid gas duct holes, hydrogen-liquid gas duct holes, hydrogen-liquid gas duct grooves and oxygen-liquid gas duct grooves are all set to 6.

[0008] The oxygen-liquid gas duct holes and the hydrogen-liquid gas duct holes are symmetrically distributed along the vertical center line of the body, the oxygen-liquid gas duct grooves and the hydrogen-liquid gas duct grooves are also symmetrically distributed along the vertical center line of the body, and the oxygen-liquid gas duct grooves and the hydrogen-liquid gas duct grooves are cross-distributed along both sides of the body.

[0009] The electrode liquid channel assembly includes a plurality of cathode liquid channel holes and anode liquid channel holes uniformly and staggeredly arranged along the circumference of the body, the cathode liquid channel holes and the anode liquid channel holes are opened on the surface of the body, the cathode liquid channel holes and the anode liquid channel holes are respectively connected to the cathode liquid channel groove and the anode liquid channel groove in a one-to-one correspondence, and the cathode liquid channel groove and the anode liquid channel groove are arranged on the surface of the body.

[0010] The surface of the main body is also provided with four electrolyte inlet holes, which are symmetrically arranged along the vertical center line of the main body. The cathode liquid channel hole, the anode liquid channel hole, the cathode liquid channel groove, and the anode liquid channel groove are arranged between the two innermost electrolyte inlet holes, and the cathode liquid channel hole and the anode liquid channel hole are symmetrically arranged along the vertical center line of the main body.

[0011] The number of cathode liquid channel holes, anode liquid channel holes, cathode liquid channel grooves and anode liquid channel grooves is set to 5, and the cathode liquid channel grooves and anode liquid channel grooves are cross-distributed along the two sides of the body.

[0012] The cathode liquid channel hole, the anode liquid channel hole, the cathode liquid channel groove and the anode liquid channel groove are arranged within a range of 130 degrees of the lower half of the body.

[0013] The body is provided with 4 positioning holes along its circumference, the 4 positioning holes are symmetrically distributed along the vertical center line and the horizontal center line of the body, and the 4 positioning holes are arranged at the edges of the upper half 130° and the lower half 130° of the body.

[0014] The beneficial effects of the present invention are as follows: the flow field alkaline water electrolyzer pole frame of the present invention is designed with mutually staggered hydrogen-liquid gas channel holes, oxygen-liquid gas channel holes, hydrogen-liquid gas channel grooves, oxygen-liquid gas channel grooves, mutually staggered electrolyte cathode liquid channel holes, electrolyte anode liquid channel holes, electrolyte cathode liquid channel grooves, electrolyte anode liquid channel grooves and electrolyte liquid inlet channels, etc., which give the inside of the electrolyzer a better uniform distribution of gas-liquid two-phase flow field, quickly discharge rising bubbles in the electrolysis chamber, eliminate the gas dead zone of the electrolysis chamber, and reduce the electrolyte resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the pole frame of the flow field alkaline water electrolyzer of the present invention;

[0016] Figure 2 It is a cross-sectional view of the pole frame of the flow field alkaline water electrolyzer of the present invention.

[0017] In the figure, 1. body, 1-1 hydrogen-liquid airway hole, 1-2 hydrogen-liquid airway groove, 1-3 oxygen-liquid airway hole, 1-4 oxygen-liquid airway groove, 1-5 electrolyte inlet channel, 1-6 positioning hole, 1-7 sealing water line, 1-8 electrolyte cathode liquid channel hole, 1-9 electrolyte cathode liquid channel groove, 1-10 electrolyte anode liquid channel hole, 1-11 electrolyte anode liquid channel groove. Detailed implementation mode

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation modes.

[0019] The present invention provides a flow field alkaline water electrolysis cell bipolar plate, as Figure 1-2 shown, including an annular body 1. Along its circumferential direction, a number of hydrogen-liquid airway holes 1-1 and oxygen-liquid airway holes 1-3 are evenly and staggeredly arranged on the body 1. Each hydrogen-liquid airway hole 1-1 is correspondingly connected to a hydrogen-liquid airway groove 1-2, and the hydrogen-liquid airway groove 1-2 is opened on the surface of the body 1. Each oxygen-liquid airway hole 1-3 is correspondingly connected to an oxygen-liquid airway groove 1-4, and the oxygen-liquid airway groove 1-4 is opened on the surface of the body 1. The body 1 is also provided with an electrode liquid channel assembly. Along its circumferential direction, the outer edge of the body 1 is connected with a sealing water line 1-7. The cross-sectional shape of the sealing water line 1-7 can be triangular or rectangular or a combination of the two forms. The number of the sealing water lines 1-7 is determined according to the layout. The body 1 can also be a square structure.

[0020] Embodiment 1

[0021] The hydrogen-liquid airway holes 1-1, hydrogen-liquid airway grooves 1-2, oxygen-liquid airway holes 1-3 and oxygen-liquid airway grooves 1-4 are arranged within a range of 130° in the upper half of the body 1. The numbers of the oxygen-liquid airway holes 1-3, hydrogen-liquid airway holes 1-1, hydrogen-liquid airway grooves 1-2 and oxygen-liquid airway grooves 1-4 are all set to 6.

[0022] The oxygen-liquid airway holes 1-3 and hydrogen-liquid airway holes 1-1 are symmetrically distributed along the vertical center line of the body 1. The oxygen-liquid airway grooves 1-4 and hydrogen-liquid airway grooves 1-2 are also symmetrically distributed along the vertical center line of the body 1. The oxygen-liquid airway grooves 1-4 and hydrogen-liquid airway grooves 1-2 are cross-distributed on both sides of the body 1. The shapes of the hydrogen-liquid airway holes 1-1 and oxygen-liquid airway holes 1-3 are long oval holes and penetrate through the body 1.

[0023] Embodiment 2

[0024] The electrode liquid channel assembly includes a number of cathode liquid channel holes 1-8 and anode liquid channel holes 1-10 that are evenly and staggeredly arranged along the circumference of the main body 1. The cathode liquid channel holes 1-8 and the anode liquid channel holes 1-10 are opened on the surface of the main body 1. The cathode liquid channel holes 1-8 and the anode liquid channel holes 1-10 are respectively connected to the cathode liquid channel groove 1-9 and the anode liquid channel groove 1-11 in a one-to-one correspondence. The cathode liquid channel groove 1-9 and the anode liquid channel groove 1-11 are arranged on the surface of the main body 1. Each cathode liquid channel hole 1-8 is connected to the cathode liquid channel groove 1-9 in a one-to-one correspondence, and each anode liquid channel hole 1-10 is also connected to the anode liquid channel groove 1-11 in a one-to-one correspondence.

[0025] Example 3

[0026] Four electrolyte inlet holes 1-5 are also opened on the surface of the main body 1. The four electrolyte inlet holes 1-5 are symmetrically arranged along the vertical center line of the main body 1. The cathode liquid channel holes 1-8, the anode liquid channel holes 1-10, the cathode liquid channel groove 1-9, and the anode liquid channel groove 1-11 are arranged between the two innermost electrolyte inlet holes 1-5. The cathode liquid channel holes 1-8 and the anode liquid channel holes 1-10 are symmetrically arranged along the vertical center line of the main body 1. The four electrolyte inlet holes 1-5 are arranged along the circumference of the main body 1, and two of the electrolyte inlet holes 1-5 are arranged within the range of 130° in the lower half of the main body 1.

[0027] Example 4

[0028] The number of the cathode liquid channel holes 1-8, the anode liquid channel holes 1-10, the cathode liquid channel groove 1-9, and the anode liquid channel groove 1-11 is set to 5. The cathode liquid channel groove 1-9 and the anode liquid channel groove 1-11 are distributed crosswise on both sides of the main body 1.

[0029] The cathode liquid channel holes 1-8, the anode liquid channel holes 1-10, the cathode liquid channel groove 1-9, and the anode liquid channel groove 1-11 are arranged within the range of 130° in the lower half of the main body 1.

[0030] Example 5

[0031] The main body 1 is provided with 4 positioning holes 1-6 along its circumference. The 4 positioning holes 1-6 are symmetrically distributed along the vertical center line and the horizontal center line of the main body 1. The 4 positioning holes 1-6 are arranged at the edges of the upper half of 130° and the lower half of 130° of the main body 1.

[0032] The working principle of the flow field alkaline water electrolysis cell electrode frame of the present invention is as follows:

[0033] The electrolyte enters the liquid collecting chamber of the electrolytic cell through the electrolyte inlet channel 1-5. The electrolyte is diverted from the liquid collecting chamber of the electrolytic cell to each electrolytic cell. It enters the cathode chamber through the electrolyte cathode liquid channel hole 1-8 and is diverted through the electrolyte cathode liquid channel groove 1-9. It enters the anode chamber through the electrolyte anode liquid channel hole 1-10 and is diverted through the electrolyte cathode liquid channel groove 1-11. In each electrolytic cell, the electrolysis reaction of water occurs under the action of a direct current. The hydrogen evolution reaction occurs in the cathode chamber to generate hydrogen gas, and the generated hydrogen gas is discharged through the hydrogen liquid-gas channel groove 1-2 and the hydrogen liquid-gas channel hole 1-1. The oxygen evolution reaction occurs in the anode chamber to generate oxygen gas, and the generated oxygen gas is discharged through the oxygen liquid-gas channel groove 1-4 and the hydrogen liquid-gas channel hole 1-2.

[0034] The bipolar plate of the flow field alkaline water electrolyzer of the present invention has multi-channel hydrogen liquid and oxygen liquid gas channels with interlaced holes, interlaced hydrogen liquid and oxygen liquid gas channels, multi-channel electrolyte inlet channels, and interlaced electrolyte cathode and anode liquid channel holes and interlaced electrolyte cathode and electrolyte anode liquid channels. It innovatively designs three grooves and a sealing structure. This new structure of the electrolyzer bipolar plate can provide multiple flow distribution channels for the electrolyte, enabling the electrolyte to quickly fill each electrolytic cell, making the electrolyte concentration uniform throughout the electrolytic cell, making the gas-liquid two-phase flow field distribution in the electrolytic cell more uniform, enabling the rising bubbles in the electrolytic cell to be quickly discharged at the shortest distance, eliminating gas accumulation, and reducing the resistance voltage drop in the electrolytic cell.

Claims

1. Flow field alkaline water electrolysis cell bipolar plate, Characterized in that, It includes an annular body (1), and a number of hydrogen liquid gas channels (1-1) and oxygen liquid gas channels (1-3) are evenly and staggeredly arranged along the circumferential direction of the body (1). Each hydrogen liquid gas channel (1-1) is correspondingly connected to a hydrogen liquid gas channel groove (1-2), and the hydrogen liquid gas channel groove (1-2) is opened on the surface of the body (1). Each oxygen liquid gas channel (1-3) is correspondingly connected to an oxygen liquid gas channel groove (1-4), and the oxygen liquid gas channel groove (1-4) is opened on the surface of the body (1). The body (1) is also provided with an electrode liquid channel assembly, and a sealing water line (1-7) is connected along the circumferential direction of the outer edge of the body (1).

2. The flow field alkaline water electrolysis cell bipolar plate according to claim 1, Characterized in that, The hydrogen liquid gas channels (1-1), hydrogen liquid gas channel grooves (1-2), oxygen liquid gas channels (1-3) and oxygen liquid gas channel grooves (1-4) are arranged within a range of 130° in the upper half of the body (1), and the number of the oxygen liquid gas channels (1-3), hydrogen liquid gas channels (1-1), hydrogen liquid gas channel grooves (1-2) and oxygen liquid gas channel grooves (1-4) are all set to 6.

3. The flow field alkaline water electrolysis cell bipolar plate according to claim 1, Characterized in that, The oxygen liquid gas channels (1-3) and hydrogen liquid gas channels (1-1) are symmetrically distributed along the vertical center line of the body (1), and the oxygen liquid gas channel grooves (1-4) and hydrogen liquid gas channel grooves (1-2) are also symmetrically distributed along the vertical center line of the body (1), and the oxygen liquid gas channel grooves (1-4) and hydrogen liquid gas channel grooves (1-2) are cross-distributed on both sides of the body (1).

4. The flow field alkaline water electrolysis cell bipolar plate according to claim 1, Characterized in that, The electrode liquid channel assembly includes a number of cathode liquid channels (1-8) and anode liquid channels (1-10) that are evenly and staggeredly arranged along the circumferential direction of the body (1). The cathode liquid channels (1-8) and anode liquid channels (1-10) are opened on the surface of the body (1). The cathode liquid channels (1-8) and anode liquid channels (1-10) are respectively correspondingly connected to cathode liquid channel grooves (1-9) and anode liquid channel grooves (1-11), and the cathode liquid channel grooves (1-9) and anode liquid channel grooves (1-11) are arranged on the surface of the body (1).

5. The flow field alkaline water electrolysis cell bipolar plate according to claim 4, Characterized in that, Four electrolyte inlet holes (1-5) are also opened on the surface of the body (1). The four electrolyte inlet holes (1-5) are symmetrically arranged along the vertical center line of the body (1). The cathode liquid channels (1-8), anode liquid channels (1-10), cathode liquid channel grooves (1-9) and anode liquid channel grooves (1-11) are arranged between the two innermost electrolyte inlet holes (1-5), and the cathode liquid channels (1-8) and anode liquid channels (1-10) are symmetrically arranged along the vertical center line of the body (1).

6. The flow field alkaline water electrolysis cell bipolar plate according to claim 5, Characterized in that, The number of the cathode liquid channel holes (1-8), anode liquid channel holes (1-10), cathode liquid channel grooves (1-9), and anode liquid channel grooves (1-11) is set to 5, and the cathode liquid channel grooves (1-9) and anode liquid channel grooves (1-11) are distributed crosswise along two sides of the body (1).

7. The bipolar plate of the flow field alkaline water electrolyzer according to claim 5, characterized in that the cathode liquid channel holes (1-8), anode liquid channel holes (1-10), cathode liquid channel grooves (1-9), and anode liquid channel grooves (1-11) are arranged within a range of 130° in the lower half of the body (1).

8. The bipolar plate of the flow field alkaline water electrolyzer according to claim 1, characterized in that the body (1) is provided with 4 positioning holes (1-6) along its circumferential direction, the 4 positioning holes (1-6) are symmetrically distributed along the vertical center line and the horizontal center line of the body (1), and the 4 positioning holes (1-6) are arranged at the edges of the upper half of 130° and the lower half of 130° of the body (1).

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