Runner structure for square alkaline water electrolysis bath pole frame

Abstract

The utility model discloses a runner structure for square alkaline water electrolyzer pole frames, which comprises a first end plate and a second end plate, a plurality of non-communicated square pole frames are sequentially arranged between the first end plate and the second end plate, and communicated square pole frames are arranged among the plurality of non-communicated square pole frames at intervals; a liquid inlet header pipe and a liquid inlet branch pipe are formed in the lower borders of the non-communicating square pole frame and the communicating square pole frame, a first connecting groove penetrating through the liquid inlet header pipe and the liquid inlet branch pipe is further formed in the communicating square pole frame, and air outlet pipelines are arranged on the upper borders of the non-communicating square pole frame and the communicating square pole frame. According to the utility model, the flow in the liquid inlet header pipe can be uniformly fed into the liquid inlet branch pipes in batches, so that the flow velocity of electrolyte is effectively relieved, and the assembly is simple.

Description

Technical Field

[0001] The utility model relates to the technical field of electrolytic hydrogen production, in particular to a flow channel structure used for a square alkaline water electrolyzer pole frame. Background Art

[0002] Water electrolysis technology is a commonly used hydrogen production method. Among them, alkaline water electrolysis has the advantages of mature technology and low production cost, and has been successfully applied in large-scale industrialization. Square electrolyzers have great advantages in saving manufacturing costs, modular combination of unit cells, and lower working pressure. However, at present, square electrolyzers with internal flow channels still have the problem of uneven electrolyte flow and flow rate in each electrolytic chamber, which can easily lead to uneven temperature distribution in each electrolytic chamber in the electrolytic cell, large fluctuation of the chamber voltage, and thus increase the energy consumption of the electrolytic cell, and even damage the diaphragm. Therefore, it is necessary to optimize the flow distribution mode of the square electrolyzer to ensure that the current and liquid flow and flow rate in each electrolytic chamber of the square electrolyzer are evenly distributed as much as possible.

[0003] The Chinese invention patent application with publication number CN116815246A discloses an electrolytic cell with uniform electrolyte flow distribution. It proposes to provide an electrolytic chamber flow channel, a liquid outlet flow channel and a distribution flow channel inside the electrolytic unit. The entire flow channel can be regarded as a parallel structure of multiple inverted "Z"-shaped flow channels, so that the electrolyte flow distribution of each electrolytic unit is the same, alleviating the uneven flow distribution between electrolytic units and reducing the waste of electric energy.

[0004] However, the above technical solution will increase the overall height of the electrolytic cell, and the end plate needs to have sufficient thickness to ensure the depth of the "U"-shaped insulating tube in the end plate, thereby increasing the weight of the overall electrolytic cell and increasing the difficulty of designing the support frame of the square electrolytic cell. In addition, the current flow distribution is in the form of multiple branch pipes on a single main pipe to distribute the electrolyte. When there are many electrolytic chambers in the electrolytic cell, this form may result in a higher flow rate in the electrolytic chambers close to the converging end plate and a lower flow rate in the electrolytic chambers far from the converging end plate, which may cause the phenomenon of uneven flow distribution to occur again. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a flow channel structure for the pole frame of a square alkaline water electrolyzer, which can realize segmented flow distribution in all electrolytic chambers of the entire square electrolytic cell, and achieve the effect of reducing the flow rate of the electrolyte by increasing the flow process of the electrolyte entering the electrolytic cell. The segmented flow distribution avoids the problem of uneven flow distribution in the electrolytic chambers of the square electrolytic cell, which causes serious local corrosion and local high temperature damage to the diaphragm.

[0006] In order to solve the above technical problems, the utility model provides a flow channel structure for a square alkaline water electrolyzer pole frame, comprising a first end plate and a second end plate, a plurality of non-connected square pole frames are sequentially arranged between the first end plate and the second end plate, and a plurality of non-connected square pole frames are alternately arranged with connected square pole frames;

[0007] The first total liquid inlet hole and the first branch liquid inlet hole are both provided on the lower frame of the unconnected square pole frame and the connected square pole frame, the first air outlet hole is both provided on the upper frame of the unconnected square pole frame and the connected square pole frame, a first connecting groove is provided between the first total liquid inlet hole and the first branch liquid inlet hole of the connected square pole frame, a second connecting groove is provided between the first branch liquid inlet hole and the corresponding pole frame small chamber groove, and a third connecting groove is provided between the first air outlet hole and the corresponding pole frame small chamber groove;

[0008] An end liquid inlet hole and an end air outlet hole are provided on the first end plate, and a plurality of first main liquid inlet holes cooperate with the end liquid inlet holes to form a main liquid inlet pipe, and a plurality of first branch liquid inlet holes cooperate to form a branch liquid inlet pipe. The main liquid inlet pipe and the branch liquid inlet pipe are connected through a first connecting groove, and a plurality of first air outlet holes cooperate with the end air outlet holes to form an air outlet pipe.

[0009] Furthermore, sealing gaskets are provided between adjacent non-connected square pole frames, between the non-connected square pole frame and the connected square pole frame, between the non-connected square pole frame and the first end plate, and between the non-connected square pole frame and the second end plate.

[0010] Furthermore, the number of the liquid inlet branch pipes is 2 and they are distributed on both sides of the liquid inlet main pipe.

[0011] Furthermore, the cross-sectional structure of the liquid inlet main pipe is elliptical.

[0012] Furthermore, the number of the liquid inlet main pipes is greater than or equal to 2.

[0013] Furthermore, the first end plate and the second end plate are both provided with a first branch liquid inlet groove and an end plate small chamber groove, a fourth connecting groove is provided between the first branch liquid inlet groove and the end plate small chamber groove, the first branch liquid inlet groove is through-connected with the liquid inlet branch pipe, a first main liquid inlet groove is also provided on the second end plate, a fifth connecting groove is provided between the first main liquid inlet groove and the first branch liquid inlet groove on the second end plate, and the first main liquid inlet groove is through-connected with the liquid inlet main pipe.

[0014] Furthermore, two first connecting grooves are arranged between the first total liquid inlet hole and the first branch liquid inlet hole of the connected square pole frame, and the two first connecting grooves are distributed on two surfaces of the connected square pole frame, and the spacing between the two first connecting grooves is greater than or equal to 2 mm.

[0015] Furthermore, the first connecting groove is used to control the flow rate between the liquid inlet main pipe and the liquid inlet branch pipe, and the flow rate is less than or equal to 2m / s.

[0016] Beneficial effects of the utility model:

[0017] By utilizing the flow channel structure of the square pole frame of the present invention, the flow distribution uniformity of each electrolytic chamber of the electrolytic cell can be effectively improved, so that the electrolyte in each electrolytic chamber can evenly take away the heat of the electrolytic chamber, thereby improving the temperature uniformity of each electrolytic chamber and avoiding damage to the diaphragm caused by local excessive temperature.

[0018] By utilizing the flow channel structure of the square pole frame of the present invention, the flow rate of the electrolyte can be effectively alleviated, and severe corrosion of the liquid inlet hole can be avoided, which would lead to increased energy consumption and decreased performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the flow channel structure of the utility model;

[0020] Figure 2 It is a schematic diagram of the structure of the non-connected square pole frame of the utility model;

[0021] Figure 3 It is a schematic diagram of a connected square pole frame of the utility model;

[0022] Figure 4 It is an enlarged schematic diagram of the structure of the connected parts of the utility model;

[0023] Figure 5 It is a schematic diagram of the cross-sectional structure of the electrolytic cell of the utility model. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0025] Reference Figures 1 to 5As shown, an embodiment of the flow channel structure for the pole frame of a square alkaline water electrolyzer of the utility model includes a first end plate 1 and a second end plate 2, a plurality of non-connected square pole frames 3 are sequentially arranged between the first end plate and the second end plate, and a plurality of non-connected square pole frames are arranged at intervals with connected square pole frames 4; the first end plate and the second end plate are the anode end plate and the cathode end plate, and the number of connected square pole frames is determined according to the size of the square electrolyzer, the performance parameter design and the operating conditions, so as to achieve a flow distribution every several electrolytic chambers, and a flow distribution can deliver electrolyte to the electrolytic chamber composed of several non-connected square pole frames adjacent to the connected square pole frame, and the electrolytic chamber is formed by the adjacent pole frame chamber grooves, and at the first end plate and the second end plate, it is formed by the adjacent pole frame chamber grooves and the end plate chamber grooves. For example, according to the assembly form of assembling 1 connected square pole frame for every 7 non-connected square pole frames, a total of 70 non-connected square pole frames and 9 connected square pole frames are required to assemble 80 electrolytic chambers.

[0026] Specifically, the first total liquid inlet hole 5 and the first branch liquid inlet hole 6 are both provided on the lower frame of the unconnected square pole frame and the connected square pole frame, the first air outlet hole 7 is both provided on the upper frame of the unconnected square pole frame and the connected square pole frame, a first connecting groove 8 is provided between the first total liquid inlet hole and the first branch liquid inlet hole of the connected square pole frame, a second connecting groove 9 is provided between the first branch liquid inlet hole and the corresponding pole frame small chamber groove, and a third connecting groove 10 is provided between the first air outlet hole and the corresponding pole frame small chamber groove; an end liquid inlet hole 11 and an end air outlet hole 12 are provided on the first end plate, a plurality of first total liquid inlet holes cooperate with the end liquid inlet holes to form a liquid inlet main pipe 13, a plurality of first branch liquid inlet holes cooperate to form a liquid inlet branch pipe, the liquid inlet main pipe and the liquid inlet branch pipe are connected through the first connecting groove, and a plurality of first air outlet holes cooperate with the end air outlet holes to form an air outlet pipe 15.

[0027] The alkali solution enters from the first main liquid inlet hole on the first end plate (the first end plate is preferably the cathode end plate, that is, the second end plate is the anode end plate) and fills the entire liquid inlet main pipe. Since there is no first connecting groove on the unconnected square pole frame, the alkali solution can flow through quickly, and the pressure at the first and end of the liquid inlet main pipe is stable and changes little. The alkali solution in the liquid inlet main pipe flows into the liquid inlet branch pipe through the first connecting grooves on the 9 connected square pole frames. Since the pressure in the liquid inlet main pipe is stable and the number of the first connecting grooves is small, the flow rate in each first connecting groove can also remain stable, that is, the alkali solution flows stably into the liquid inlet branch pipe, and the flow rate in each first connecting groove is stable, which can ensure that the pressure of each section in the liquid inlet branch pipe is basically the same, that is, the uniformity of flow distribution can be ensured. Subsequently, the alkali solution enters the electrolytic chamber from the liquid inlet branch pipe through the second connecting groove; through multiple second connecting grooves, the alkali solution can evenly fill the entire electrolytic cell at a stable flow rate.

[0028] There are 2 liquid inlet branch pipes and they are distributed on both sides of the liquid inlet main pipe. One liquid inlet main pipe supplies liquid to two liquid inlet branch pipes. The cross-sectional structure of the liquid inlet main pipe is elliptical, that is, a waist-shaped hole structure, which can ensure sufficient liquid inlet flow while extending in both sides, thereby reducing the opening size in the direction of the frame height and ensuring the frame strength. There are 2 liquid inlet main pipes and they are symmetrically arranged along the center line of the lower frame to ensure uniform distribution.

[0029] Sealing gaskets 16 are arranged between adjacent non-connected square pole frames, between the non-connected square pole frame and the connected square pole frame, between the non-connected square pole frame and the first end plate, and between the non-connected square pole frame and the second end plate. The sealing gaskets are provided with sealing gasket waist holes 161 and sealing gasket liquid inlet holes 162 to ensure the sealing between adjacent structures.

[0030] Since there is also a chamber between the unconnected square pole frame and the corresponding first and second end plates, in order to form an electrolytic chamber, a first branch liquid inlet groove 17 and an end plate chamber groove 18 are provided on the first and second end plates, a fourth connecting groove 19 is provided between the first branch liquid inlet groove and the end plate chamber groove, the first branch liquid inlet groove is connected to the liquid inlet branch pipe, and a first total liquid inlet groove 20 is also provided on the second end plate, a fifth connecting groove 21 is provided between the first total liquid inlet groove and the first branch liquid inlet groove on the second end plate, and the first total liquid inlet groove is connected to the liquid inlet main pipe. Therefore, the second end plate also has a diversion channel, which can be used to distribute liquid at the tail end of the liquid inlet main pipe, and the first end plate can also supply liquid to the corresponding electrolytic chamber.

[0031] In addition, two first connection grooves are arranged between the first total liquid inlet hole and the first branch liquid inlet hole of the above-mentioned connected square pole frame, and the two first connection grooves are distributed on the two surfaces of the connected square pole frame. The spacing between the two first connection grooves is greater than or equal to 2mm, so as to avoid deformation of the structure of the pole frame here when the electrolytic cell is assembled and pressed, and the way of opening the first connection grooves on both sides can make the middle part evenly stressed. The first connection groove is used to control the flow rate between the liquid inlet main pipe and the liquid inlet branch pipe, and the flow rate is less than or equal to 2m / s, which meets the liquid supply requirements and ensures stability during use.

[0032] The above embodiments are only preferred embodiments for fully illustrating the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or changes made by technicians in this technical field on the basis of the present utility model are all within the protection scope of the present utility model. The protection scope of the present utility model shall be subject to the claims.

Claims

1. A flow channel structure for a square alkaline water electrolyzer pole frame, characterized in that: It comprises a first end plate and a second end plate, a plurality of non-connected square pole frames are sequentially arranged between the first end plate and the second end plate, and connected square pole frames are arranged at intervals in the plurality of non-connected square pole frames; The first total liquid inlet hole and the first branch liquid inlet hole are both provided on the lower frame of the unconnected square pole frame and the connected square pole frame, the first air outlet hole is both provided on the upper frame of the unconnected square pole frame and the connected square pole frame, a first connecting groove is provided between the first total liquid inlet hole and the first branch liquid inlet hole of the connected square pole frame, a second connecting groove is provided between the first branch liquid inlet hole and the corresponding pole frame small chamber groove, and a third connecting groove is provided between the first air outlet hole and the corresponding pole frame small chamber groove; An end liquid inlet hole and an end air outlet hole are provided on the first end plate, and a plurality of first main liquid inlet holes cooperate with the end liquid inlet holes to form a main liquid inlet pipe, and a plurality of first branch liquid inlet holes cooperate to form a branch liquid inlet pipe. The main liquid inlet pipe and the branch liquid inlet pipe are connected through a first connecting groove, and a plurality of first air outlet holes cooperate with the end air outlet holes to form an air outlet pipe.

2. The flow channel structure for the pole frame of a square alkaline water electrolyzer according to claim 1, characterized in that: Sealing gaskets are arranged between adjacent non-connected square pole frames, between the non-connected square pole frame and the connected square pole frame, between the non-connected square pole frame and the first end plate, and between the non-connected square pole frame and the second end plate.

3. The flow channel structure for the pole frame of a square alkaline water electrolyzer according to claim 1, characterized in that: The number of the liquid inlet branch pipes is 2 and they are distributed on both sides of the liquid inlet main pipe.

4. The flow channel structure for the pole frame of a square alkaline water electrolyzer according to claim 3, characterized in that: The cross-sectional structure of the liquid inlet main pipe is elliptical.

5. The flow channel structure for the pole frame of a square alkaline water electrolyzer according to claim 3, characterized in that: The number of the liquid inlet main pipes is greater than or equal to 2.

6. The flow channel structure for the pole frame of a square alkaline water electrolyzer according to claim 1, characterized in that: A first branch liquid inlet groove and an end plate small chamber groove are both provided on the first end plate and the second end plate, a fourth connecting groove is provided between the first branch liquid inlet groove and the end plate small chamber groove, the first branch liquid inlet groove is through-connected with the liquid inlet branch pipe, a first main liquid inlet groove is also provided on the second end plate, a fifth connecting groove is provided between the first main liquid inlet groove and the first branch liquid inlet groove on the second end plate, and the first main liquid inlet groove is through-connected with the liquid inlet main pipe.

7. The flow channel structure for the pole frame of a square alkaline water electrolyzer according to claim 1, characterized in that: Two first connecting grooves are arranged between the first total liquid inlet hole and the first branch liquid inlet hole of the connected square pole frame. The two first connecting grooves are distributed on the two surfaces of the connected square pole frame. The spacing between the two first connecting grooves is greater than or equal to 2 mm.

8. The flow channel structure for the pole frame of a square alkaline water electrolyzer according to claim 1, characterized in that: The first connecting groove is used to control the flow rate between the liquid inlet main pipe and the liquid inlet branch pipe, and the flow rate is less than or equal to 2m / s.

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