Combined desulfurization and denitrification system for sintering flue gas

Abstract

The invention discloses a combined desulfurization and denitrification system for sintering flue gas, and belongs to the technical field of sintering flue gas treatment. The system comprises a boosterfan and an active coke adsorption tower, wherein a flue gas pipeline is connected between the booster fan and the active coke adsorption tower; an adsorption tower feeding system and an active coke bin are arranged at the input end of the active coke adsorption tower; the output end of the active coke adsorption tower is provided with a regeneration tower feeding system and an active coke regeneration tower; one side of the active coke adsorption tower is connected with a heat exchanger through the flue gas pipeline, and the exterior of the heat exchanger is respectively connected with an SCRreactor and a heater. The sintering flue gas desulfurization and denitrification process combining activated coke desulfurization and SCR method denitrification is high in efficiency, free of secondary pollution or waste treatment, capable of efficiently removing dioxin at the same time and meeting the low-emission requirement, is an environment-friendly process route completely meeting the current and future stricter environment-friendly requirements, and has wide market prospects.

Description

technical field [0001] The invention relates to the technical field of sintering flue gas treatment, and more specifically relates to a sintering flue gas combined desulfurization and denitrification system. Background technique [0002] Sintering is the main source of pollution in steel production. Pollutants include particulate matter, SO2, NOx, CO2, CO, dioxins, fluorides, chlorides, and heavy metals. Among them, SO 2 It accounts for about 60% of the total emissions of the iron and steel industry, smoke dust accounts for about 20% of the total emissions of the iron and steel industry, and nitrogen oxides (NOx) accounts for about 48% of the total emissions. [0003] Based on the current desulfurization and denitrification technologies for sintering flue gas, wet desulfurization (FGD) and circulating fluidized bed semi-dry (CFB) desulfurization efficiencies are relatively high, but the absorption effect on NOx is not good, and both produce waste water, desulfurization ash,...

AI Technical Summary

Problems solved by technology

Because the ozone denitrification method is to oxidize low-valence NOx to high-valence NOx, and then use alkaline absorbent to remove it, it will also produce secondary pollutants and bring new follow-up problems, and ozone preparation consumes a lot of power. The process cost of large flue gas volume is high, and there are few engineering applications

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