Asymmetric multi-channel liquid inlet and exhaust structure for large alkaline water electrolytic tank

Abstract

The invention relates to an asymmetric multi-channel liquid inlet and exhaust structure for a large alkaline water electrolytic bath, the electrolytic bath comprises a bath body, a front pole plate, a rear pole plate, a front end pressing plate and a rear end pressing plate, the bath body, the front pole plate and the rear pole plate are all provided with inner cavities, the front pole plate and the rear pole plate are provided with radial holes, and a plurality of small electrolysis chambers are arranged in the inner cavity of the bath body; a main electrolyte inlet is formed in the lower end of the front-end pressing plate, a plurality of hydrogen-side auxiliary electrolyte inlets and oxygen-side auxiliary electrolyte inlets are formed in the middle of the front-end pressing plate, and the main electrolyte inlet, the hydrogen-side auxiliary electrolyte inlets and the oxygen-side auxiliary electrolyte inlets are communicated with an inner cavity of the rear polar plate; a hydrogen outlet and an oxygen outlet communicated with the inner cavity of the rear polar plate are formed in the upper end of the front-end pressing plate. Compared with the prior art, the hydrogen-side auxiliary electrolyte inlet and the oxygen-side auxiliary electrolyte inlet are additionally arranged, the hydrogen-side auxiliary electrolyte channel is communicated with the cathode chamber, and the oxygen-side auxiliary electrolyte channel is communicated with the anode chamber, so that the temperature of one side can be relatively independently controlled, and the temperatures of the two electrodes of the small electrolysis chamber are uniformly distributed.

Description

technical field [0001] The invention relates to the hydrogen production technology of electrolyzed water, in particular to an asymmetric multi-channel liquid inlet and exhaust structure for large-scale alkaline water electrolyzers. Background technique [0002] The pressure of global warming is increasing, and countries around the world are focusing on clean energy. Hydrogen energy is the key to green development in the new era due to its low-carbon, clean, high energy density, and wide sources. The alkaline water electrolyzer is the key equipment of the renewable energy electrolysis water hydrogen production technology. With the rapid development of hydrogen energy, the alkaline water electrolyzer is also gradually developing to large-scale. [0003] The water electrolyzer is composed of electrolysis chambers connected in series. The industrial alkaline water electrolyzer generally supplies the lye needed by the electrolyzer from an lye inlet. This liquid supply structure i...

AI Technical Summary

Problems solved by technology

However, with the enlargement of the alkaline water electrolyzer, the number of electrolytic chambers connected in series will also increase greatly, which will increase the length of the flow field inside the alkaline water electrolyzer, and the single lye channel will affect the mass transfer and heat transfer effect of the electrolyzer , the uniformity of the flow field in the tank becomes worse, which causes uneven temperature distribution inside the electrolytic tank, especially the uneven temperature distribution of the cathode and anode of the electrolytic tank, which reduces the efficiency of the electrolytic tank and shortens the service life of the electrolytic tank

[0004] Chinese patent CN212669809U discloses a new type of water electrolyzer with a flow field structure. By setting the middle plate, the tank body is separated, and the front half tank and the second half tank form two independent cycles, which do not interfere with each other. The essence is The large-scale alkaline water electrolyzer is divided into two small and medium-sized electrolyzers, and no substantial improvement has been made to the liquid inlet and exhaust channels

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