Novel electrolytic bath electrode plate with optimized structure, electrolytic unit and application

Abstract

The invention provides a novel electrolytic bath electrode plate with an optimized structure, an electrolytic unit and application, and the novel electrolytic bath electrode plate with the optimized structure comprises an electrode frame and a main electrode plate, the electrode frame is annular; a main polar plate is arranged in the electrode frame, and the electrode frame and the main polar plate are coaxially arranged; the electrode frame and the main polar plate form a liquid storage cavity; a liquid inlet runner and a gas-liquid outlet runner are arranged on the electrode frame; an inlet distributor is arranged on the surface of one side, in the liquid storage cavity, of the main polar plate and is close to the liquid inlet runner, a middle-section fluid accelerator is arranged in the middle, and a plurality of liquid distribution units which are arranged in a concave-convex manner are arranged on the rest part; each liquid distribution unit is a rhombic unit with a diagonal line parallel to the direction in which liquid flows through the main polar plate. According to the novel electrolytic cell electrode plate with the optimized structure, the flow velocity distribution is uniform when liquid flows through, the transportation and discharge of bubbles can be accelerated, the retention time of the bubbles in a chamber is shortened, the mass transfer process of hydrogen production reaction is enhanced, and the hydrogen production efficiency of a system is improved.

Description

technical field [0001] The invention belongs to the field of electrolytic hydrogen production, and in particular relates to a novel electrolytic cell electrode plate with an optimized structure, an electrolytic unit and its application. Background technique [0002] Hydrogen energy is a new type of clean energy. In the process of hydrogen energy utilization, only water will be produced in the end, and no pollutants or carbon dioxide emissions will be generated. At present, hydrogen production by electrolysis of water is the most commonly used and only large-scale commercial hydrogen production method. The structure of the electrolyzer determines the flow distribution of the electrolyte, which has an important influence on the efficiency of the electrolytic hydrogen production process. At present, the surface of the main plate inside the electrolytic unit (chamber) of the commercial filter press type electrolyzer mostly adopts a concave-convex structure (papillary structure)...

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Problems solved by technology

[0003] 1. The traditional electrode plate has no inlet distribution structure. When the lye flows in, the flow velocity at the center is high, and the flow velocity at both sides is small, such as figure 2 As shown, the flow rate of lye is significantly unevenly distributed on the plate (the difference in cross-section velocity near the inlet is CV=2.0), and the hydrogen production efficiency is reduced.

[0004] 2. The papillae structure has a weak effect on the distribution of lye

This will lead to a large difference in the velocity distribution of the alkali solution on the cross section of the electrode plate, that is, the flow velocity in the central area of ​​the electrode plate is relatively large, and the flow velocity in the two sides is relatively small, which will further lead to the uneven concentration of the alkali solution in the small chamber, and the flow velocity on both sides of the electrode plate will be relatively large. Regional air bubbles / heat are not easily carried out by the lye, and as the size of the electrolytic cell increases, the uneven distribution of the lye flow rate becomes more serious, which will greatly hinder the development of large-scale electrolyzer equipment

[0005] 3. The concave-convex structure on the surface of the electrode plate makes the two sides of the electrode plate in "top-to-top" contact, that is, they are not in full contact. As the electrolysis progresses, a large number of air bubbles generated in the small chamber move to the position near the concave-convex apex, which will increase the number of electrode plates. Contact resistance increases electrolysis energy consumption

[0006] 4. When the bubbles in the electrolysis unit pass through the concave-convex structure, they may be "stuck" in the depression, increasing the residence time of the bubbles and increasing the energy consumption of electrolysis

The adhesion of air bubbles on the wall hinders the discharge of air bubbles, increases the electrode resistance, and reduces the electrolysis efficiency

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