Device and method for maintaining liquid level balance of alkaline electrolysis system and inhibiting blow-by risk

Abstract

The invention discloses a device and a method for maintaining liquid level balance of an alkaline electrolysis system and inhibiting a blow-by risk. The method comprises the step of installing a safety device for inhibiting the blow-by risk on a U-shaped pipe between two gas-liquid separators in the alkaline electrolysis system. The mode for restraining the blow-by risk of the two gas-liquid separators in the alkaline electrolysis system through the safety device comprises at least one of slowing down the flowing speed of liquid in the U-shaped pipe, increasing the flowing path of the liquid in the U-shaped pipe and reducing the flow of the liquid in the U-shaped pipe passing through the safety device. According to the invention, when the electrolysis power is changed, the alkali liquor in the gas-liquid separator on one side can be effectively prevented from carrying hydrogen or oxygen to flow into the other side under the action of pressure, so that the blow-by risk caused by breaking the liquid level balance is avoided, and the safety problem under the condition of off-grid hydrogen production of the fluctuating renewable energy source is solved; and the off-grid hydrogen production safety performance of the alkaline electrolysis system is improved.

Description

technical field [0001] The invention relates to the technical field of hydrogen production by electrolysis of water, in particular to a device and method for maintaining the liquid level balance of an alkaline electrolysis system and suppressing the risk of cross gas. Background technique [0002] The alkaline electrolysis system usually uses 30% mass concentration of KOH solution as the electrolyte, nickel mesh as the electrode for electrolysis, and generates hydrogen and oxygen at the cathode and anode, respectively. The electrode reaction of the alkaline electrolysis system is as follows: [0003] [0004] In order to prevent the short circuit caused by the mixing of hydrogen and oxygen during the electrolysis process and the direct contact of the electrodes, a separator is usually used to isolate the cathode and anode chambers. Asbestos cloth was widely used as a diaphragm in the past, but because asbestos dust is easy to cause cancer, with the development, diaphragm...

AI Technical Summary

Problems solved by technology

[0008]Therefore, the technical problem to be solved by the present invention is: when the electrolysis power of the alkaline electrolysis system in the prior art changes, the liquid level in the U-shaped pipe is balanced is broken, resulting in the risk of gas crossover, thereby providing a device and method for maintaining the liquid level balance of the alkaline electrolysis system and suppressing the risk of cross gas

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