Method and device for cleaning multi-pollutant flue gas

Abstract

A method for cleaning, treating and disposing of multi-pollutant flue gas, the method comprising the following steps: 1) adsorption of multi-pollutant flue gas: treating multi-pollutant flue gas with activated carbon to obtain adsorbed saturated activated carbon; 2) thermal regeneration of activated carbon: adsorbing Saturated activated carbon is heated to high temperature for thermal regeneration; 3) SRG gas treatment: SRG gas generated by thermal regeneration of activated carbon is wet-washed to obtain high-sulfur gas and acidic scrubbing wastewater; 4) High-sulfur gas treatment: the high-sulfur gas obtained in step 3) Sulfur gas recovers sulfur resources through the sulfur resource process; 5) Acidic washing wastewater treatment: the acidic washing wastewater obtained in step 3) is filtered through acid to obtain clear liquid and carbon powder; 6) clear liquid flocculation: obtained in step 5) Alkali is added to the clear liquid to make the clear liquid flocculate and precipitate to obtain metal-containing sludge and salt-containing wastewater. By adopting the method of the invention, secondary pollutants can be well treated, wastes can be turned into treasures, reused, costs can be saved, resources can be recycled, and the environment can be protected.

Description

Technical field [0001] The present invention relates to a multi-pollutant flue gas treatment method, and more particularly to a multi-pollutant flue gas cleaning treatment method and a device thereof. It belongs to the field of resource environmental protection. Background technique [0002] In conventional steel, electricity, colored, petrochemical, chemical or building materials, often produce a variety of pollutants, such as SO due to many types of raw materials used. 2 , NOx, dust, VOCS, heavy metals, etc. As the national environmental laws and standards are more strict, except for major pollutants, it has gradually been strictly limited to the emissions of various secondary pollutants. For example, the National Environmental Protection Department issued the implementation of "Iron and Steel Sintering, Pollutant Emission Standards" (GB28662-2012) in 2012 (GB28662-2012) increased NOx, dioxin contaminants, and fluoride emission standards. This makes the flue gas governance tech...

AI Technical Summary

Problems solved by technology

[0005] Although the activated carbon flue gas control technology can realize the coordinated removal of multiple pollutants, in fact, the pollutants are only enriched through adsorption-desorption, and there is a problem of secondary pollution.

For example, the charcoal powder produced in the adsorption and desorption process has not been effectively used, the desorption gas washing wastewater has not been effectively treated, and the high concentration sulfur dioxide flue gas generated after desorption is not up to the standard after the sulfur resource recovery, which seriously limits the activated carbon smoke. Popularization and Application of Gas Control Technology

Due to the relatively short period of industrial use of activated carbon flue gas control technology in China, the above-mentioned problems are relatively new and difficult to deal with. There is no process technology that can be used for reference in the world, and completely independent innovation is urgently needed

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