Device and method for producing hydrogen and byproduct oxygen by using green electricity electrolyzed water

Abstract

A device and a method for producing hydrogen and byproduct oxygen by using green electricity electrolyzed water are used for reducing the scale of air separation equipment, reducing the air treatment amount of an air compressor, reducing the investment of the air separation equipment and reducing the operation energy consumption. The device comprises an oxygen purification system, a heat exchange system, an air separation compression and expansion system, an air separation rectification system and a liquid oxygen storage system. The method comprises the following steps: firstly, purifying oxygen prepared by electrolyzing water by green electricity to remove impurities such as hydrogen, carbon monoxide, carbon dioxide and water in the oxygen, then feeding the pure oxygen into a heat exchange system, performing heat exchange liquefaction to obtain liquid oxygen, coupling the liquid oxygen generated by rectification of the air separation rectification system, and obtaining pressure oxygen through the heat exchange system and the air separation compression and expansion system. The system is highly coupled, the load of the air compressor is effectively reduced, the scale of the air separation equipment is reduced, the operation energy consumption of the air separation equipment is reduced, and the purposes of high efficiency, safety and energy conservation are achieved.

Description

technical field [0001] The invention relates to the coupled utilization of green electricity water electrolysis hydrogen production by-product oxygen generated by solar energy and other renewable energy and the compression oxygen production in air separation equipment, and the utilization of oxygen liquefaction energy storage, specifically relates to a green electricity electrolysis water hydrogen production by-product oxygen The device and method belong to the technical field of oxygen production and the technical field of energy storage. Background technique [0002] Due to its zero-carbon emissions during release, hydrogen energy is expected to change the human energy system. The "green hydrogen" produced by water electrolysis using renewable energy such as solar energy is considered to be an ideal form of hydrogen energy utilization because there is no carbon emission in the preparation process. [0003] China is short of oil and gas and relatively rich in coal resource...

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Problems solved by technology

[0004] Green energy such as solar energy is greatly affected by natural environmental factors (seasons, weather), and its power generation process has the characteristics of large fluctuations, discontinuity, randomness, and uncontrollability. ; On the other hand, the oxygen by-product of large-scale green power water electrolysis hydrogen production has not been well utilized at present, and there are a large number of oxygen abandonment phenomena.

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