CN218910544U - An electrolyzed water plate with radial flow field channels - Google Patents

Abstract

The utility model belongs to the technical field of hydrogen production by electrolysis of water, and discloses an electrolysis water pole plate with a radial flow field flow channel, which is mainly formed by an outer ring electrode frame and a pole plate; the outer ring electrode frame is provided with a plurality of gas Liquid outlets, multiple electrolyte inlets, flange sealing lines, and sunken steps for placing diaphragm materials and electrode materials; both sides of the electrolytic water plate are equipped with radial flow field channels, gas-liquid outlets, and electrolyte import. According to the fluid flow characteristics of the electrolyte and the heat and mass transfer effects of the fluid, the bipolar plate forms a radiating smooth structure through circular rectangular protrusions. The double-density radial flow field is a bipolar plate with a bipolar plate with a high density of rectangular protrusions on the outer ring and a small density of rectangular protrusions on the inner ring, forming a double-density radial flow field. The utility model increases the conductive area with the electrode material through the ingenious design of the flow field, increases the flow rate of the electrolyte, improves the heat transfer efficiency of the fluid flow, and reduces the working energy consumption of the electrolytic cell.

Description

An electrolyzed water plate with radial flow field channels

technical field

The utility model belongs to the technical field of hydrogen production by electrolysis of water, and in particular relates to an electrode plate with a multi-layer radial flow channel flow field.

Background technique

Hydrogen production by electrolysis of water includes alkaline electrolysis of water for hydrogen production, proton exchange membrane electrolysis of water for hydrogen production, and solid oxide electrolysis of water for hydrogen production. Compared with the other two electrolytic hydrogen production technologies, alkaline water electrolysis hydrogen production has the advantages of extensive commercialization, high technology maturity, low equipment cost, large-scale hydrogen production, and long service life. The working temperature of alkaline water electrolysis hydrogen production is moderate, and the requirements for material selection, sealing and operation control are not so strict.

At present, alkaline electrolysis tanks at home and abroad adopt the filter-press structure of flow field bipolar plate + cathode collector + electrolytic diaphragm + anode collector + flow field bipolar plate as the electrolysis unit. Polytetrafluoroethylene (PTFE) is used as the sealing material. Most of the large electrolytic cells use concave-convex stamping plates and plate frames welded as flow field bipolar plates. The unique spherical concave-convex improves the flow rate, current density and temperature distribution of lye. of evenness. However, there are still disadvantages such as high mold cost, high processing difficulty, low flow rate due to large lye stock, serious gas stagnation, low current density, and high unit energy consumption, which limit the development of alkaline water hydrogen production technology.

Based on the above-mentioned technical problems caused by the polar plate in alkaline electrolyzed water hydrogen production, this utility model proposes a new type of electrolyzed water with a radial flow field flow channel inside, based on the outer frame structure of the existing electrolyzed water plate plate.

Utility model content

The utility model aims at the above problems, makes up for the deficiencies of the prior art, and provides an electrode plate with a double-layer density radial channel flow field. The utility model can increase the flow rate of the lye, increase the conductive area of the polar plate and the collector electrode, further reduce the voltage of the electrolysis chamber under the same conditions, improve the electrolysis efficiency of the equipment, and reduce the unit energy consumption.

In order to achieve the above object, the utility model adopts the following technical solutions:

An electrolyzed water plate with a radial flow field flow channel, which is mainly formed by an outer electrode frame and an electrode plate; the outer electrode frame is provided with a plurality of gas-liquid outlets 1, a plurality of electrolyte inlets 7, flanges The sealing line 2 and the corresponding sunken steps for placing the diaphragm material and electrode material; both sides of the electrolytic water plate are provided with radial flow field channels;

The radial flow field flow channel is mainly composed of rectangular protrusions arranged on the pole plate. The rectangular protrusions are divided into high-density rectangular protrusions 5 on the outer ring and low-density rectangular protrusions 6 on the inner ring; the radius of the pole plate is R , every R/10 is a group from the inside to the outside; the first group is the flow channel, the second to the tenth group are composed of protrusions and flow channels, and the protrusions and flow channels are arranged alternately at equal intervals; the second group to the The fourth group is divided into nine groups in the circumferential direction, and the protrusions and the flow channels are also arranged alternately at equal intervals; the fifth to tenth groups are divided into thirty-six groups in the circumferential direction, and the protrusions and the flow channels are also arranged alternately at equal intervals.

The cavity formed between the electrode material and the surface of the bipolar plate forms the vertical space of the flow field, and the horizontal space of the flow channel is formed between the rectangular protrusions. The electrolyte enters the flow field space through multiple inlets for electrolytic reaction, and finally the gas and liquid flow from The electrolytic reaction process that flows out of the multiple outlets constitutes a small chamber.

The novel beneficial effect of this experiment:

The utility model pioneeringly uses a double-layer radiation density flow field, and according to the flow characteristics of the electrolyte fluid and the heat and mass transfer effect of the fluid, the bipolar plate forms a radiation-type smooth structure through circular rectangular protrusions. The double-density radial flow field is a bipolar plate with a high density of rectangular protrusions on the outer ring and a small density of rectangular protrusions on the inner ring of the bipolar plate, forming the double-density radial flow field of the bipolar plate.

In the utility model, the flow field flow channel is designed as a radial flow channel with double-layer density distribution inside and outside. When the electrolyte driven by the circulating pump flows through, the high-density rectangular protrusion on the outer ring will shunt the electrolyte at the inlet, increasing the flow rate of the electrolyte. Large electrolyte flow rate, the outer ring forms a local negative pressure, attracting the bubbles generated by electrolysis to quickly leave the electrode surface and merge into the outer ring flow channel and the outlet; the inner ring low-density rectangular protrusions increase the vortex flowing through the electrolyte The space is conducive to the mass transfer and heat transfer of two-phase flow.

Furthermore, the utility model increases the conductive area with the electrode material through the ingenious design of the flow field, increases the flow rate of the electrolyte, improves the heat and mass transfer efficiency of the fluid flow, and reduces the energy consumption of the electrolytic cell . In one embodiment, using the device of the utility model at a working temperature of 65°C, the current density can reach 4200A·m ^-2 , and the highest energy consumption is as low as 4.2kWh/Nm ³ , which is lower than the extremely Board performance (≥4.3kWh/Nm ³ @4000A·m ^-2 ).

Description of drawings

Fig. 1 is a front view of the overall structure of the electrode plate of the present invention.

Fig. 2 is a partially enlarged schematic diagram of the radial flow channel with inner and outer double-layer density distribution of the utility model.

Fig. 3 is a side sectional view of the overall structure of the utility model.

Fig. 4 is a schematic diagram of the assembly of a single cell composed of a diaphragm and electrode material of the present invention.

Fig. 5 is a processing physical diagram of an embodiment of the present invention.

In the figure: 1 gas-liquid outlet; 2 plate sealing line; 3 place diaphragm material sinking steps; 4 place electrode material sinking steps; 5 outer ring high-density rectangular protrusions; 6 inner ring low-density rectangular protrusions; 7 electrolyte inlet ; 8 PTFE gaskets; 9 electrode materials; 10 diaphragm materials.

Detailed ways

Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

As shown in Figure 1, this embodiment provides an electrode plate with a double-layer density radial channel flow field, wherein the outer ring electrode frame is provided with a plurality of gas-liquid outlets 1 and a plurality of electrolyte inlets 7 , In addition, flange sealing line 2 and sunken steps 3, 4 for placing diaphragm material and electrode material are also provided.

As shown in Figures 2 and 3, in this embodiment, the outer ring high-density rectangular protrusions 5 and the inner ring low-density rectangular protrusions 6 are provided on the inner radial flow field bipolar plate. In this embodiment, both sides are provided with radial flow field, gas-liquid outlet 1 for hydrogen and oxygen separation, and electrolyte inlet 7, which can realize the combined structure of electrolysis chambers in filter press layout.

The outer ring electrode frame and the inner ring flow field bipolar plate are integrally cut and formed, which saves the welding process of the bipolar plate and the plate frame, and does not increase the processing cost due to the complicated shape of the flow field structure. The unique inner and outer ring double-density radial flow fields 5 and 6 are easy to pass in the same direction as the gas-liquid flow in the electrolytic chamber. According to the requirements of the embodiment, the overall size of the electrode plate can be adjusted adaptively to meet the diversified design of the electrolytic cell structure.

In this embodiment, the electrolyte enters the cavity of the radial flow field from three direction inlets 7 driven by the external circulation pump, and the high-density rectangular protrusion 5 on the outer ring will divide the electrolyte at the inlet, increasing the The flow rate of the electrolyte, the outer ring forms a local negative pressure, attracts the bubbles generated by electrolysis to quickly leave the electrode surface, and merges into the outer ring flow channel and the outlet; the inner ring low-density rectangular protrusions 6 increase the vortex flowing through the electrolyte The space is conducive to the mass transfer and heat transfer of two-phase flow. The gas-liquid mixed flow is finally discharged from the flow field through three outlets 1 and converged to the external pipeline to form a cycle.

As shown in Figure 5, in this embodiment, the technical parameters of the radiation field flow channel are: the radius of the pole plate is 300 mm, and every 30 mm from the inside to the outside is a group; the first group is the flow channel, and the second group to the tenth group They are all composed of protrusions and flow channels, and the protrusions and flow channels are arranged alternately at equal intervals; the second group to the fourth group are divided into nine groups in the circumferential direction, and the protrusions and flow channels are also arranged alternately at equal intervals; The tenth group is divided into thirty-six groups in the circumferential direction, and the projections and flow channels are also arranged alternately at equal intervals. In particular, in this embodiment, the inlets and outlets 1 and 7 of the outer frame are matched with the outer ring flow channel to avoid interference.

In this embodiment, the electrolyte enters the cavity of the radial flow field from three direction inlets 7 driven by the external circulation pump, and the high-density rectangular protrusion 5 on the outer ring will divide the electrolyte at the inlet, increasing the The flow rate of the electrolyte, the outer ring forms a local negative pressure, attracts the bubbles generated by electrolysis to quickly leave the electrode surface, and merges into the outer ring flow channel and the outlet; the inner ring low-density rectangular protrusions 6 increase the vortex flowing through the electrolyte The space is conducive to the mass transfer and heat transfer of two-phase flow. The gas-liquid mixed flow is finally discharged from the flow field through three outlets 1 and converged to the external pipeline to form a cycle.

It can be understood that the above specific description of the utility model is only used to illustrate the utility model and is not limited to the technical solutions described in the implementation of the utility model. Those of ordinary skill in the art should understand that they can still understand the utility model Modifications or equivalent replacements are carried out to achieve the same technical effect; as long as the needs of use are met, they are all within the protection scope of the present utility model.

Claims (1)

1. An electrolytic water polar plate with a radiation type flow field runner is characterized in that the electrolytic water polar plate is mainly formed by an outer ring electrode frame and a polar plate integrally; the outer ring electrode frame is provided with a plurality of gas-liquid outlets (1), a plurality of electrolyte inlets (7), flange sealing wires (2) and sinking steps corresponding to the electrode materials for placing the diaphragm materials; both sides of the electrolytic water polar plate are provided with radiation type flow field flow channels;

the radiation type flow field flow channel is mainly formed by dividing rectangular bulges arranged on the polar plate, wherein the rectangular bulges are divided into an outer ring high-density rectangular bulge (5) and an inner ring low-density rectangular bulge (6); the radius of the polar plate is R, and each R/10 from inside to outside is a group; the first group is a runner, the second group to the tenth group are composed of bulges and runners, and the bulges and the runners are alternately distributed at equal intervals; the second group to the fourth group are divided into nine groups in the circumferential direction, and the protrusions and the flow channels are alternately distributed at equal intervals; the fifth group to the tenth group are divided into thirty-six groups in the circumferential direction, and the protrusions and the flow channels are alternately arranged at equal intervals.

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