Process and system for activated-carbon desulfurization and denitration of coke oven flue gas and comprehensive utilization of byproducts

Abstract

The invention relates to a process and a system for activated-carbon desulfurization and denitration of coke oven flue gas and comprehensive utilization of byproducts. The activated carbon is adoptedas a desulfurization adsorbent and a denitration catalyst of the coke oven flue gas, sulfur-rich gas generated by desulfurization is sent to a chemical production process of a coking plant for producing sulfur or ammonium sulfate, and powdered activated carbon which cannot be recycled is sent to a sewage treatment process of the coking plant as a high-efficiency adsorbent of coking wastewater, sothat the byproducts from activated-carbon desulfurization and denitration of the coke oven flue gas are recycled. Real desulfurization and denitration integration is realized, requirements of desulfurization and denitration indexes are met, and the activated carbon is environmentally friendly; the sulfur-rich gas generated by desulfurization is sent to the chemical production process of the cokingplant for producing sulfur or ammonium sulfate; ammonia is used as a reducing agent in activated carbon denitration, and the generated products are nitrogen and water, which can be directly discharged with flue gas; the worn powdered activated carbon is sent to the sewage treatment process of the coking plant as the high-efficiency adsorbent of the coking wastewater, and thus, comprehensive utilization of the desulfurization and denitration by-products of the coke oven flue gas is realized.

Description

technical field [0001] The invention relates to the technical field of coke oven flue gas purification treatment, in particular to a coke oven flue gas desulfurization and denitrification and by-product comprehensive utilization process and system. Background technique [0002] At present, the coke oven flue gas desulfurization and denitrification process mainly adopts various combined processes of SCR denitrification technology and wet desulfurization, dry or semi-dry desulfurization technology. [0003] Conventional SCR denitrification technology uses heavy metal catalysts such as vanadium-titanium or manganese-based catalysts. Such catalysts contain heavy metal elements. After reaching the service life, they are classified as hazardous waste materials and must be disposed of by professional institutions. There is a potential risk of damage to the environment. [0004] Wet, dry or semi-dry desulfurization technologies based on calcium-based and sodium-based desulfurizers w...

AI Technical Summary

Problems solved by technology

Since the coke oven flue gas contains a lot of impurities, the purity of the generated sulfur-containing solid by-products is very low, basically useless or the cost of secondary utilization is very high, and the treatment of by-products has always been an industry problem

[0005] In addition, the combination process of the current SCR denitrification technology and various desulfurization technologies cannot truly realize the integration of desulfurization and denitrification, that is, the desulfurization and denitrification reactions can be completed in the same equipment

The combined desulfurization and denitrification process is long, the system is complex, and there are many operation and maintenance points, which increases the land occupation and operating costs

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