Method for treating salty sewage of coal chemical industry based on in-furnace combustion

Abstract

A method for processing coal-chemical-industry salt-containing sewage based in furnace internal combustion is disclosed and belongs to the technical field of sewage processing. According to the method, salt-containing sewage is processed by using crystallization equipment, thus a crystal substance is formed, then the crystal substance is added into a boiler for blending combustion, contamination scorification and high-temperature chlorine corrosion are comprehensive considered, the maximum processing quantity of salt-containing sewage with different concentrations is calculated according to the mass percentage of crystal-substance alkali metal salts in the original salt-containing sewage, various organics and a large amount of inorganic salts in the salt-containing sewage crystal substance are effectively processed in a high-temperature combustion environment, and thus the large-scale processing problem of the salt-containing sewage is solved. Under the cases that the boiler is safely economically operated and the boiler thermal efficiency decrease is acceptable, the coal-chemical-industry sewage processing cost is greatly reduced, and the method is applicable to process coal-chemical-industry with high alkali metal content.

Description

technical field [0001] The invention relates to a method for treating salty sewage of coal chemical industry based on combustion in a furnace. The sewage of coal chemical industry is evaporated and concentrated into crystals and then added to a boiler for mixed combustion, and the pollution and slagging and high-temperature chlorine corrosion are comprehensively considered to calculate the coal chemical industry. The maximum treatment capacity of salty sewage to ensure the safe and economical operation of the boiler belongs to the technical field of sewage treatment. Background technique [0002] Coal chemical industry needs to consume a lot of water. Typical coal chemical sewage contains as many as 130 kinds of organic substances that are difficult to degrade, and its main components include COD (2000-4000mg / L), ammonia nitrogen (200-500mg / L), The concentration is 300-1000mg / L, the mass concentration of volatile phenol is 50-300mg / L, and it also contains toxic and harmful s...

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Problems solved by technology

In addition, coal chemical wastewater also contains various soluble inorganic salts (crystalline salts). The specific content depends on the mineral components in the coal, but mainly alkali metal salts such as sodium salts. Large, but the purity is not high, and the commercial value is very low. The research on boiler ash deposition and slagging shows that the presence of alkali metals such as sodium has an important impact on boiler contamination and slagging, and it is still necessary to reduce the sintering temperature of coal ash and accelerate the process of coal ash sintering. Sintering rate and important reasons for increasing sintering strength and causing pipe wall corrosion

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