阅读说明：本技术 一种轴向非等距波纹板电极 (Axial non-equidistant corrugated plate electrode ) 是由 王金意 张畅 张欢 任志博 王鹏杰 徐显明 张竹砚 于 2021-09-23 设计创作，主要内容包括：本发明公开了一种轴向非等距波纹板电极,包括电极片,电极片上设置有正、反向凸出的乳突结构；乳突结构沿电极片上的中心轴线呈轴向对称分布,相邻两个乳突结构的间距以中心轴线为中心向外侧逐步增大。电极片上的乳突结构通过机械冲压形成。所述中心轴线两侧乳突结构之间的间距成倍数增加。通过将电极片上乳突结构的位置从竖直中心轴向外发散排列,在电解槽工作过程中通入电解液后,电解液到达远离中心轴位置时,相比于乳突位置均匀分布的极片,受到的阻力更小,电解液流速更接近于中心轴附近位置的流速。从而保证整个极板表面流速一致性、各个位置传质的均匀性,从而避免气泡大小和产出速率的差异,避免电解浓差,有利于电解槽稳定、安全运行。(The invention discloses an axial non-equidistant corrugated plate electrode which comprises an electrode plate, wherein a mastoid structure protruding in the positive direction and a mastoid structure protruding in the reverse direction are arranged on the electrode plate; the mastoid structures are axially and symmetrically distributed along the central axis on the electrode plate, and the distance between every two adjacent mastoid structures is gradually increased outwards by taking the central axis as the center. The mastoid structure on the electrode sheet is formed by mechanical stamping. The distance between mastoid structures on both sides of the central axis is multiplied. Through the position with mastoid process structure on the electrode plate outwards disperse the range from vertical center pin, let in electrolyte in the electrolysis trough working process after, when electrolyte reachd the center axis position of keeping away from, compare in the pole piece of mastoid process position evenly distributed, the resistance that receives is littleer, and the electrolyte velocity of flow is more close to the velocity of flow of the near position of center pin. Thereby ensuring the consistency of the flow velocity on the surface of the whole polar plate and the uniformity of mass transfer of each position, avoiding the difference of the size of bubbles and the output rate, avoiding the concentration difference of electrolysis and being beneficial to the stable and safe operation of the electrolytic cell.)

1. The axial non-equidistant corrugated plate electrode is characterized by comprising an electrode plate (1), wherein a mastoid structure protruding in the positive direction and a mastoid structure protruding in the reverse direction are arranged on the electrode plate (1);

the mastoid structure is axially and symmetrically distributed along the central axis (3) on the electrode plate (1), and the distance between two adjacent mastoid structures gradually increases towards the outside by taking the central axis (3) as the center.

2. An axially non-equidistant corrugated sheet electrode as in claim 1, characterized in that the mastoid structure on the electrode sheet (1) is formed by mechanical punching.

3. An axially non-equidistant corrugated sheet electrode according to claim 1, characterized in that the distance between the mastoid structures on both sides of the central axis (3) is multiplied.

4. An axially non-equidistant corrugated sheet electrode according to claim 1, characterized in that the distance d between the mastoid structures on both sides of the central axis (3) satisfies the following formula:

wherein: s is the distance from the central point of the mastoid process in the 1 st row to the central axis (3);

l is the distance from the central line of the forward mastoid process in the 2 nd row to the central line in the 1 st row;

k is a divergence coefficient and is a real number with a numerical value greater than 0;

n is the number of columns.

5. An axial non-equidistant corrugated plate electrode as claimed in claim 1, wherein the electrode plate (1) is circumferentially surrounded by a frame (2) at the outer side, and the bottom and the top of the frame (2) are provided with an electrolyte inlet and an electrolyte outlet.

6. An axially non-equidistant corrugated sheet electrode according to claim 5, characterized in that the electrode sheet (1) is fixedly connected to the electrode frame (2) by welding.

7. An axially non-equidistant corrugated plate electrode as claimed in claim 5, characterized in that the electrode frame (2) is provided with grooves, and the electrode sheet (1) is embedded in the grooves of the electrode frame (2) for fixed connection.

8. An axially non-equidistant corrugated sheet electrode according to claim 1, characterized in that the surface of the electrode sheet (1) is provided with an electrocatalyst layer.

9. An axially non-equidistant corrugated plate electrode as claimed in claim 1, characterized in that the substrate of the electrode sheet (1) is stainless steel, metallic nickel or metallic titanium, and the surface of the electrode sheet (1) is plated with a nickel-based alloy electrocatalyst layer or a platinum-based alloy electrocatalyst layer.

Technical Field

The invention belongs to the technical field of hydrogen production by water electrolysis, and particularly belongs to an axial non-equidistant corrugated plate electrode.

Background

Hydrogen is an important industrial raw material and also an energy carrier. At present, the hydrogen production technology mainly uses fossil fuels such as coal, natural gas and the like to react with steam at high temperature for conversion, and accounts for more than 99 percent of the total yield; the other type of hydrogen production technology is hydrogen production by water electrolysis, and the hydrogen production by water electrolysis can be coupled with the power generation process of renewable energy sources such as wind power, photovoltaic and hydroelectric power, so that the large-scale consumption of intermittent renewable energy sources is realized, carbon emission is not produced in the hydrogen production process, and the large-scale carbon-free production of hydrogen is realized under the background that the power generation cost of the renewable energy sources is greatly reduced.

The principle of water electrolysis is that under the action of direct current, water molecules are dissociated into hydrogen and oxygen through an electrochemical process, and the hydrogen and the oxygen are separated out at the cathode and the anode respectively. Water electrolysis technologies currently include alkaline water electrolysis and proton exchange membrane electrolysis (PEM) technologies. PEM technology is costly and not yet universally available. From the economical point of view, the alkaline water electrolysis device is relatively suitable for large-scale application. The commonly used alkaline water electrolysis generally employs a high-concentration potassium hydroxide aqueous solution (20 wt% to 30 wt%) having high conductivity as an electrolyte, and the electrolysis is performed at 70 to 85 ℃.

The electrolyzer is the core equipment in the electrolytic water system, generally adopts a filter-press type bipolar structure, and is composed of a plurality of unit cells which have the same size and structure and are connected in series. The small chambers are firmly pressed together by fasteners such as end pressure plates and fastening bolts to form a complete electrolytic cell. The electrolysis chamber consists of a cathode and an anode, a diaphragm and a sealing gasket. The surface of the cathode and anode plate is a place where the electrolytic water hydrogen evolution and oxygen evolution reaction occurs, the cathode of a certain small chamber is also the anode next to the small chamber, the polar plate generally adopts a corrugated plate with regularly distributed protrusion shapes, and the protrusion structure can play the roles of supporting the electrode and providing an electrolyte circulation channel. The pole plates are welded to the frame so that a frame assembly is formed for stacking and securing. The diaphragm is clamped between the polar plates and can separate oxyhydrogen gas generated by electrolysis, so that the chamber is divided into a cathode chamber and an anode chamber. In order to avoid gas and electrolyte leakage, a sealing gasket needs to be fastened between the polar frame assemblies for sealing, and the diaphragm and the sealing gasket can be of a split structure or an integrated structure.

The polar plates are vertically stacked together in the electrolytic bath, electrolyte flows in from a liquid inlet on the polar frame at the bottom end or near the top end of the vertical axis of the polar plates, flows out from a liquid outlet at the top end or the bottom end aligned with the axis after flowing through the small chamber, and the mastoid structure on the polar plates supports the space of the diaphragm to form a flow channel of the electrolyte. Because the electrolytic component is of a bipolar structure, the mastoid has positive direction and also reverse direction, and the adjacent small chambers are used as supports, so that the positive and negative direction alternate structure forms the electrode corrugated plate. The mastoid structures on the existing corrugated plate are generally uniformly distributed, and the distances between the center points of the mastoid structures are equal. In the process of electrolyte flowing, the mastoid structure can generate resistance on a flowing path, because the distance from an electrolyte inlet to a certain horizontal line on the electrode plate is inconsistent, the current uniformly distributed mastoid structure can cause the flow rate of the electrolyte at the outer edge of the electrode plate to be lowered, because the potentials of all points of the electrode plate are basically consistent under the electrified condition, the problems of slow bubble diffusion, increased local resistance, fluctuation of electrolyte concentration, concentration difference of the electrolyte on the surface and the like are easily caused due to nonuniform electrolyte flow rate on the surface of the electrode, the electrolysis efficiency of the electrode is reduced, and the safe and stable operation of an electrolytic cell is also influenced. The large-scale electrolytic cell size is the trend of large-scale hydrogen production in the future, and the problem is more obvious on a large-size polar plate.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides an axial non-equidistant corrugated plate electrode which can improve the flow rate of electrolyte on the surface of the electrode plate at a position far away from the central axis of the plate, so that the flow rate of the electrolyte on the surface of the electrode plate at a position close to the central axis is more similar to the flow rate of the electrolyte on the surface of the electrode plate at a position close to the central axis, the uniformity of the surface environment of the electrode is improved, the electrolysis efficiency is improved, and the safety and stability of the water electrolysis process are ensured.

In order to achieve the purpose, the invention provides the following technical scheme:

an axial non-equidistant corrugated plate electrode comprises an electrode plate, wherein a mastoid structure protruding in the positive direction and a mastoid structure protruding in the reverse direction are arranged on the electrode plate;

the mastoid structures are axially and symmetrically distributed along the central axis on the electrode plate, and the distance between every two adjacent mastoid structures is gradually increased outwards by taking the central axis as the center.

Preferably, the mastoid structure on the electrode sheet is formed by mechanical punching.

Preferably, the spacing between mastoid structures on either side of the central axis is multiplied.

Preferably, the distance d between mastoid structures on both sides of the central axis satisfies the following formula:

wherein: s is the distance from the center point of the mastoid process in the 1 st row to the central axis;

l is the distance from the central line of the forward mastoid process in the 2 nd row to the central line in the 1 st row;

k is a divergence coefficient and is a real number with a numerical value greater than 0;

n is the number of columns.

Preferably, the outer side of the electrode plate is circumferentially surrounded by a polar frame, and the bottom and the top of the polar frame are provided with an electrolyte inlet and an electrolyte outlet.

Further, the electrode plate is fixedly connected with the electrode frame through welding.

Furthermore, a groove is formed in the pole frame, and the electrode plate is embedded into the groove of the pole frame and fixedly connected.

Preferably, the surface of the electrode sheet is provided with an electrocatalyst layer.

Preferably, the electrode sheet base material is stainless steel, metallic nickel or metallic titanium, and the surface of the electrode sheet is plated with a nickel-based alloy electrocatalyst layer or a platinum-based alloy electrocatalyst layer.

Compared with the prior art, the invention has the following beneficial technical effects:

the invention provides an axial non-equidistant corrugated plate electrode, wherein the positions of mastoid structures on electrode plates are arranged in an outward diverging manner from a vertical central shaft, and after electrolyte is introduced in the working process of an electrolytic cell, when the electrolyte reaches the position far away from the central shaft, the resistance applied to the electrode plates is smaller compared with the electrode plates uniformly distributed at the mastoid positions, and the flow velocity of the electrolyte is closer to the flow velocity of the position near the central shaft. Thereby ensuring the consistency of the flow velocity on the surface of the whole polar plate and the uniformity of mass transfer of each position, avoiding the difference of the size of bubbles and the output rate, avoiding the concentration difference of electrolysis and being beneficial to the stable and safe operation of the electrolytic cell.

Drawings

FIG. 1 is a schematic structural diagram of the front surface of an axial non-equidistant corrugated plate electrode in the invention.

In the figure: 1 is an electrode slice; 2 is a polar frame; and 3 is a central axis.

Detailed Description

The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.

Example 1:

as shown in figure 1, the electrode sheet 1 of the corrugated plate electrode with non-equidistant axial direction is provided with a mastoid structure protruding in the positive direction and the reverse direction and is formed by mechanical stamping. The electrode plate 1 is connected with the electrode frame 2 through welding or clamping.

The bottom and the top of the pole frame 2 are provided with an electrolyte inlet and an electrolyte outlet.

The electrode plate 1 is made of stainless steel, metallic nickel or metallic titanium and other electric conductors, and the surface of the electrode is plated with a nickel-based alloy and platinum-based alloy electrocatalyst layer.

The pole pieces are vertically arranged in the electrolytic cell, the mastoid structures on the pole pieces on the left side and the right side of the vertical central axis 3 are axially and symmetrically distributed, and the distance from the central point of each vertical mastoid column in the same direction on one side of the central axis 3 to the central axis 3 gradually diverges. The distance from the central line of the 2 nd row of forward mastoid process on one side of the axis to the central line of the 1 st row is 4-1, the distance from the central line of the 3 rd row of forward mastoid process to the central line of the 2 nd row is 4-2, the length of 4-2 is greater than 4-1, the rest rows are analogized, and the distances of all the other rows are multiplied.

The distance d from the center point of the N-th row of the equidirectional mastoids on one side of the central axis 3 to the central axis 3 meets the following formula:

wherein s is the distance from the center point of the mastoid process in the 1 st row to the central axis 3;

l is the distance from the central line of the forward mastoid process in the 2 nd row to the central line in the 1 st row;

k is a divergence coefficient and is a real number with a numerical value greater than 0; the value 10> k > 0.1;

n is the number of columns.

The large circular holes in fig. 1 represent the positive mastoids, the small circular holes represent the negative mastoids, and the centers of the negative mastoids are located between the two rows of positive mastoids, so that the distances between each row of negative mastoids are also gradually diverging.

The corrugated plate electrode is provided with mastoid structures protruding in the positive direction and the reverse direction, the pole pieces are vertically arranged in the electrolytic bath, the mastoid structures on the pole pieces on the left side and the right side of the vertical central axis are axially and symmetrically distributed, and the distances from the central points of the vertical mastoid columns in the same direction on one side of the central axis to the central axis gradually diverge. After the electrolyte is introduced into the electrolytic cell during working, when the electrolyte reaches a position far away from the central shaft, the resistance received by the electrolytic cell is smaller than that of the pole pieces uniformly distributed at the mastoid positions, and the flow velocity of the electrolyte is closer to that of the position near the central shaft. Thereby ensuring the consistency of the flow velocity on the surface of the whole polar plate and the uniformity of mass transfer of each position, avoiding the difference of the size of bubbles and the output rate, avoiding the concentration difference of electrolysis and being beneficial to the stable and safe operation of the electrolytic cell.

Example 2:

an axially non-equidistant corrugated plate electrode is characterized in that an electrode plate 1 is provided with a mastoid structure protruding in the positive direction and the negative direction and is formed by mechanical stamping. The electrode plate 1 is connected with the electrode frame 2 through welding.

The bottom and the top of the pole frame 2 are provided with an electrolyte inlet and an electrolyte outlet.

The base material of the electrode plate 1 is 304 stainless steel, and the surface of the electrode is plated with nickel.

The pole pieces are vertically arranged in the electrolytic cell, the mastoid structures on the pole pieces on the left side and the right side of the vertical central axis 3 are axially and symmetrically distributed, and the distance from the central point of each vertical mastoid column in the same direction on one side of the central axis 3 to the central axis 3 gradually diverges. The distance from the central line of the 2 nd row of positive mastoid to the central axis 3 is 3 cm, the distance from the central line of the 2 nd row of positive mastoid to the central line of the 1 st row on one side of the axis is 3 cm, the distance from the central line of the 3 rd row of positive mastoid to the central line of the 2 nd row is 6 cm, the distance from the central line of the 4 th row of positive mastoid to the central line of the 3 rd row is 9 cm, and the distance from the rest rows to the previous row is increased by 3 cm.

Example 3:

an axially non-equidistant corrugated plate electrode is characterized in that an electrode plate 1 is provided with a mastoid structure protruding in the positive direction and the negative direction and is formed by mechanical stamping. The electrode plate 1 is embedded into the groove of the electrode frame 2 and connected.

The bottom and the top of the pole frame 2 are provided with an electrolyte inlet and an electrolyte outlet.

The electrode plate 1 is made of titanium material, and the surface of the electrode is plated with nickel-cobalt alloy.

The pole pieces are vertically arranged in the electrolytic cell, the mastoid structures on the pole pieces on the left side and the right side of the vertical central axis 3 are axially and symmetrically distributed, and the distance from the central point of each vertical mastoid column in the same direction on one side of the central axis 3 to the central axis 3 gradually diverges. The distance from the central line of the 2 nd row of positive mastoid to the central axis 3 is 3 cm, the distance from the central line of the 2 nd row of positive mastoid to the central line of the 1 st row on one side of the axis is 4 cm, the distance from the central line of the 3 rd row of positive mastoid to the central line of the 2 nd row is 5 cm, the distance from the central line of the 4 th row of positive mastoid to the central line of the 3 rd row is 6 cm, and the distance from the rest rows to the previous row is increased by 1 cm.