Device and method for comprehensively carrying out desulfurization, denitration and dioxin removing on steel sintering flue gas

Abstract

The invention discloses a device and a method for comprehensively carrying out desulfurization, denitration and dioxin removing on steel sintering flue gas. The device mainly comprises a GGH (Gas Gas Heater), a flue gas heating furnace, an ammonia injection grid, an SCR (Selective Catalytic Reduction) reactor, a flue gas-water heat exchanger, a booster fan, a circulating water pump, a desulfurization tower, a chimney and the like. The method adopts a technology of desulfurizing after denitrating and is characterized by firstly accessing sintering flue gas after dust removing to an SCR flue gas denitration device after passing through a main exhaust fan, thus removing NOX and the dioxin; then enabling the sintering flue gas to enter a wet desulfurization tower to desulfurizing, and finally enabling the sintering flue gas to be subjected to standardized emission through the chimney. According to the device and the method, disclosed by the invention, in one hand, the sintering flue gas can be subjected to standardized emission, and the phenomenon that white smoke is discharged by the chimney is removed; meanwhile, on the other hand, the heating energy consumption of the flue gas is reduced, and the energy source is saved.

Description

technical field [0001] The invention belongs to the field of environmental protection of iron and steel sintering production, in particular to a method for comprehensively removing SO in iron and steel sintering flue gas 2 , NO X and dioxin devices and methods. Background technique [0002] Sintering production is one of the most important process units in modern steel production, and it is also a major polluter in the steel industry. Sintering process NO X Emissions account for approximately 50% of total emissions from the steel industry, S0 2 Emissions account for about 60% of the total emissions of the iron and steel industry, and dioxins produced by sintering and electric furnaces in the iron and steel industry account for 25.9% of the total national dioxin emissions. With the increasing environmental protection requirements in our country, not only for sintering flue gas dust and SO 2 emissions are more stringent, while the NO X And dioxin emissions also put forwa...

AI Technical Summary

Problems solved by technology

[0005] The main disadvantage of the existing technology is the large energy consumption

Wet desulfurization + SCR denitrification and dioxin removal technology needs to heat the desulfurization wet flue gas at 50 ℃ ~ 60 ℃ to above 320 ℃ to effectively denitrify and remove dioxins, which consumes a lot of fuel

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