A selective sintering flue gas segmented comprehensive treatment process

Abstract

The invention discloses a selective sintering flue gas sectional type comprehensive treatment technology, and belongs to the technical field of energy conservation and environmental protection. Flue gas circulation sintering is performed on ignition section flue gas with the high SO2 concentration and the low NOx concentration at a sintering head part; dust removal and desulfurization are performed on flue gas with the high SO2 concentration at a sintering middle part and then the flue gas is exhausted out; dust removal is performed on flue gas with the low SO2 concentration and the low NOx concentration at the sintering middle part and then the flue gas is exhausted out; dust removal and denitrification are performed on flue gas with the low SO2 concentration and the high NOx concentration at a sintering tail part, then the flue gas is mixed with flue gas at a high temperature section of a cooler, and waste heat recovery is performed; heated air circulation sintering is performed on the recycled hot flue gas; and steam generated after waste heat recycling can be used for waste heat power generation or steam-driving sintering of a main suction fan. According to the selective sintering flue gas sectional type comprehensive treatment technology, sintering flue gas section desulfurization and denitrification are achieved, and the flue gas discharge amount is decreased; and the flue gas waste heat recycling efficiency is improved, the construction investment and production running cost are lowered on the whole, and the selective sintering flue gas sectional type comprehensive treatment technology conforms to the energy-saving, environment-friendly, emission reduction, consumption reduction, efficiency increase and recycling economic running mode.

Description

technical field [0001] The invention belongs to the technical field of energy saving, environmental protection, emission reduction and consumption reduction in the sintering production process of the iron and steel metallurgy industry, and relates to a segmented comprehensive treatment process for sintering flue gas desulfurization and denitrification and cascade utilization of flue gas waste heat, in particular to a selective sintering process A comprehensive treatment process for flue gas segmental desulfurization and denitrification, hot air circulation sintering, and waste heat recovery and utilization of flue gas, more specifically involving a SO 2 , NO x , CO x A selective sintering flue gas segmented comprehensive treatment process with concentration distribution characteristics. Background technique [0002] The iron and steel industry is a major energy consumer and also a major polluter. The sintering process is one of the main sources of air pollutants in the iro...

AI Technical Summary

Problems solved by technology

[0006] To sum up, the current control and removal methods of sintering flue gas pollutants are mostly terminal treatment processes with a single function. With the increase of pollutant emission restrictions, the terminal treatment process facilities can only be more and more, occupying more and more land. The larger the size, the higher the construction investment and operating costs; the waste heat of the sintering process is also recycled from a single part, which also causes waste in equipment investment and operation, site occupancy, etc.

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