Asymmetric mastoid pole plate for alkaline electrolytic bath

Abstract

The invention relates to an alkaline electrolytic water hydrogen production system, in particular to an asymmetric mastoid type polar plate used for an alkaline electrolytic bath, which can ensure uniform flow of alkaline liquor at a cathode and an anode and guarantee electrolytic efficiency, and comprises a polar plate body, a cathode-to-mastoid process facing the cathode and an anode-to-mastoid process facing the anode are arranged on the polar plate, and the cathode-to-mastoid process and the anode-to-mastoid process are arranged on the polar plate body. The electrode is characterized in that the height from the cathode to the mastoid process is 4.5-5.5 mm, and the height from the anode to the mastoid process is 3.5-4.5 mm.

Description

Technical Field

[0001] This invention relates to an alkaline water electrolysis hydrogen production system, specifically an asymmetric papillary electrode plate used in an alkaline electrolyzer. Background Technology

[0002] Electrolytic hydrogen production is a key technology for wind and solar power utilization. Alkaline water electrolysis is currently the most mature and commercially available hydrogen production technology. Its basic principle involves passing direct current into an alkaline aqueous solution, decomposing water into hydrogen and oxygen. The electrolyzer is the core equipment of the alkaline water electrolysis hydrogen production system, and its design and performance directly affect the efficiency and safety of the system. During water electrolysis, the volume yield of hydrogen is twice that of oxygen. As the current density increases, the difference in volume yield between hydrogen and oxygen in the same electrolysis unit gradually increases, leading to a significant difference in the alkaline solution flow rate between the cathode and anode in the electrolysis chamber. This can result in insufficient alkaline solution flow at the cathode, causing localized overheating and excessive gas content, leading to decreased electrolysis efficiency. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides an asymmetric nipple-shaped electrode plate for use in an alkaline electrolyzer, which ensures uniform alkaline flow at both the cathode and anode, thereby guaranteeing electrolysis efficiency.

[0004] The technical solution is as follows: an asymmetric papillary electrode plate used in an alkaline electrolytic cell, comprising an electrode plate body, wherein the electrode plate is provided with a cathode-oriented papillary facing the cathode and an anode-oriented papillary facing the anode, characterized in that the height of the cathode-oriented papillary is 4.5-5.5 mm and the height of the anode-oriented papillary is 3.5-4.5 mm.

[0005] A further feature is that the cathode-oriented papillae and the anode-oriented papillae are arranged at intervals.

[0006] By employing this invention, the different heights of the cathode protrusion and the anode protrusion increase the volume of the cathode chamber, reduce the pressure loss of the two-phase flow through the cathode chamber, increase the alkaline flow rate of the cathode chamber, ensure the uniformity of the alkaline flow field between the cathode and anode, and prevent problems such as excessively high local temperatures and excessively high gas content, thus ensuring electrolysis efficiency. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the electrode plate structure of the present invention; Figure 2 This is a schematic diagram of the nipple protrusions on the side of the electrode plate. Detailed Implementation

[0008] See Figure 1 , Figure 2As shown, an asymmetric nipple-type electrode plate used in an alkaline electrolytic cell includes an electrode plate body, on which a cathode-oriented nipple 1 facing the cathode and an anode-oriented nipple 2 facing the anode are provided. The height of the cathode-oriented nipple 1 is 4.5-5.5 mm, and the height of the anode-oriented nipple 2 is 3.5-4.5 mm. In the design, the height of the cathode-oriented nipple 1 is always about 1 mm higher than the height of the anode-oriented nipple 2, and the height difference is significant. The difference in nipple height increases the volume of the cathode chamber, reduces the pressure loss of the two-phase flow through the cathode chamber, and increases the alkaline flow rate of the cathode chamber.

[0009] The cathode-oriented nipple 1 and the anode-oriented nipple 2 are arranged alternately. They can be evenly distributed, or the distribution can be adjusted according to the analysis results of computational fluid dynamics to further optimize the flow field uniformity.

Claims

1. An asymmetric papillary electrode plate for use in an alkaline electrolytic cell, comprising an electrode plate body, wherein the electrode plate is provided with cathode-oriented papillae facing the cathode and anodic papillae facing the anode, characterized in that, The height of the cathode protrusion is 4.5-5.5 mm, and the height of the anode protrusion is 3.5-4.5 mm.

2. The asymmetric papillary electrode plate used in an alkaline electrolytic cell according to claim 1, characterized in that, The cathode-oriented papillae and the anode-oriented papillae are arranged alternately.

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