Hydrogen production method, hydrogen production system, circulation method and circulation device of hydrogen production electrolyte

Abstract

The invention discloses a hydrogen production method, a hydrogen production system, a hydrogen production electrolyte circulation method and a circulation device. The circulation method includes an oxygen side electrolyte circulation method and / or a hydrogen side electrolyte circulation method; an oxygen side electrolyte circulation method The method comprises the steps of: performing gas-liquid separation on the gas-liquid mixture discharged from the oxygen side of the electrolytic cell to obtain an oxygen-side separation electrolyte; performing step-down gas-liquid separation on the oxygen-side separation electrolyte to obtain a step-down separation electrolyte on the oxygen side; The electrolytic solution is depressurized and separated on the side to boost the pressure and input to the electrolytic cell; the electrolyte circulation method on the hydrogen side includes the steps of: performing gas-liquid separation on the gas-liquid mixture discharged from the hydrogen side of the electrolytic cell to obtain the hydrogen-side separated electrolyte; The electrolytic solution is decompressed and gas-liquid separated to obtain the decompressed and separated electrolyte on the hydrogen side; the depressurized and separated electrolyte on the hydrogen side is boosted and input to the electrolytic cell. The above circulation method can improve the purity of hydrogen and oxygen obtained by electrolyzing water to produce hydrogen, and can also ensure a relatively high system pressure.

Description

technical field [0001] The invention relates to the technical field of hydrogen production by electrolysis of water, and more specifically, to a hydrogen production method, a hydrogen production system, a circulation method and a circulation device for hydrogen production electrolyte. Background technique [0002] At present, in the electrolytic water hydrogen production process, the gas-liquid mixture on the hydrogen side and the gas-liquid mixture on the oxygen side produced by the electrolysis of the electrolyzer enter their respective gas-liquid separators, and the electrolytes separated by the gas-liquid separators are combined and then enter the heat exchanger. It is cooled and then fed back to the electrolyzer. [0003] Due to the high pressure of the entire hydrogen production system, the electrolyte contains hydrogen and oxygen, and the cooled electrolyte carries hydrogen and oxygen into the anode and cathode electrolysis chambers of the electrolytic cell, causing t...

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Problems solved by technology

[0003] Due to the high pressure of the entire hydrogen production system, the electrolyte contains hydrogen and oxygen, and the cooled electrolyte carries hydrogen and oxygen into the anode and cathode electrolysis chambers of the electrolytic cell, causing the oxygen generated in the anode electrolysis chamber to be mixed with hydrogen and cathode. The hydrogen produced by electrolysis in the electrolysis chamber is mixed with oxygen, resulting in low purity of the obtained hydrogen

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