System and method for preparing hydrogen and oxygen by electrolyzing sewage

Abstract

The invention discloses a system and method for preparing hydrogen and oxygen by electrolyzing sewage. The system comprises a primary sedimentation tank, a reagent A dosing device, a reagent A stirring device, a reagent B dosing device, a reagent B stirring device, a secondary sedimentation tank, a resin filter, an RO (Reverse Osmosis) water purifier, a purified water reservoir and a water electrolysis device. The method comprises the following steps: (1) carrying out primary sedimentation on sewage; (2) adding a reagent A and a reagent B to the sewage subjected to primary sedimentation; (3) carrying out secondary sedimentation on the sewage; (4) filtering by the resin filter; (5) producing pure water by the RO water purifier; and (6) carrying out pure water electrolysis to obtain hydrogen and oxygen. The system and method disclosed by the invention have the beneficial effects that the prepared hydrogen is used for generating electricity which is then transmitted to a power grid at the power grid peak period to achieve the effects of clipping peak and filling vale of the power grid; on the one hand, the municipal sewage is treated at a lower cost, on the other hand, a water source is provided for preparing hydrogen and oxygen by electrolyzing water, and thus a large number of underground water sources are saved.

Description

technical field [0001] The invention relates to a system and method for producing hydrogen and oxygen, in particular to a system and method for producing hydrogen and oxygen by electrolyzing sewage. Background technique [0002] Hydrogen is used in a wide range of fields. Among them, as an important petrochemical raw material, it is used in the production of methanol and hydrogenation reactions in petroleum refining processes. In addition, it is used in the electronics industry, metallurgical industry, food processing industry, fine chemical synthesis, and aerospace industry. field application. The largest amount of hydrogen is used for ammonia synthesis. 60% of the world's hydrogen is used for ammonia synthesis, and the proportion in China is even higher. In order to improve the environmental requirements, the quality requirements for gasoline and diesel are constantly increasing at home and abroad. Hydrogenation in the refining process The refining process also requires a...

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Problems solved by technology

[0003] At present, technically speaking, there are many well-developed methods for hydrogen production, such as hydrogen production by water-gas method. This method has low hydrogen production cost, large output, and many equipments. This method is often used in synthetic ammonia plants; Hydrogen production from cracked synthesis gas and natural gas. This method has high manufacturing costs, but in terms of developability, no method superior to hydrogen production by electrolysis of water has been found. Therefore, hydrogen production by electrolysis of water has the most application prospects. method, it has the advantages of high product purity, easy operation, no pollution, no noise, recyclable utilization, etc.

However, hydrogen production by electrolysis of water requires the consumption of a large amount of groundwater resources. Due to limited water resources, hydrogen production by electrolysis of water is limited.

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