Combined alkali liquor circulating device, alkaline water electrolysis hydrogen production system and control method

Abstract

The invention relates to a combined alkali liquor circulating device, an alkaline water electrolysis hydrogen production system and a control method. The combined alkali liquor circulating device is used for supplying alkali liquor for alkaline water electrolysis hydrogen production, and comprises an alkali liquor filter, an alkali supplementing module, a combined alkali liquor circulating moduleand an alkali liquor circulating controller, the input end of the alkali liquor filter is respectively connected with the liquid output end of a gas-liquid separator of an alkaline water electrolysishydrogen production device and the alkali supplementing module, the output end of the alkali liquor filter is connected to an electrolytic cell of the alkaline water electrolysis hydrogen production device through the combined alkali liquor circulating module to form a closed-loop circulating system, the alkali supplementing module and the combined alkali liquor circulating module are connected tothe alkali liquor circulating controller, the combined alkali liquor circulating module comprises a plurality of alkali liquor circulating branches with different alkali liquor flow ranges, the alkali liquor circulating branches are arranged in parallel, and at least one alkali liquor circulating branch works during working. Compared with the prior art, the adaptability of alkaline electrolyzed water under wide power fluctuation is improved, and the economical efficiency of an alkali liquor circulating system is improved.

Description

technical field [0001] The invention relates to the technical field of hydrogen production by alkaline electrolysis of water, in particular to a combined lye circulation device, a hydrogen production system by alkaline electrolysis of water and a control method. Background technique [0002] The source of hydrogen is an important issue in the development of hydrogen energy at present. Hydrogen is still used as an industrial raw material gas and has abundant applications in the chemical industry. In terms of sources, there are mainly three mature technical routes; one is hydrogen production by reforming fossil energy ; The second is industrial by-product hydrogen; the third is electrolysis of water to produce hydrogen. In electrolysis of water to produce hydrogen, the most mature technical route is alkaline electrolysis of water technology. The existing related research does not take into account the lye supply problem of alkaline electrolyzed water for hydrogen production a...

AI Technical Summary

Problems solved by technology

The existing related research does not take into account the lye supply problem of alkaline electrolyzed water for hydrogen production under different power conditions, and lacks the wide power adaptability of alkaline electrolyzed water for hydrogen production equipment starting from the system lye circulation. Combined lye circulation system and control strategy of alkaline electrolysis water hydrogen production device

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