Comprehensive processing process for sintering smoke gas

Abstract

The invention discloses a comprehensive processing process for sintering smoke gas, wherein traditional cement-producing equipment is directly adopted by the process, and the process comprises the following steps of: 1) recovering the residual heat, wherein one part of the sintering smoke gas with low dioxin concentration is used as combustion-supporting air to enter an air-heating furnace of a rotary kiln, the other part of the sintering smoke gas is used as cooling gas to enter a grate cooler, the high-temperature smoke gas coming from the grate cooler is used as combustion-supporting gas to respectively enter the rotary kiln and enter a decomposing furnace from the middle part of the decomposing furnace, and the high-temperature smoke gas after being combusted through the rotary kiln enters the decomposing furnace from the bottom of the decomposing furnace; 2) removing dioxin, wherein the sintering smoke gas with high dioxin concentration enters the decomposing furnace from the middle part of the decomposing furnace, and the temperature in the decomposing furnace is larger than or equal to 800 DEG C; and 3) desulfurizing, wherein the high-temperature smoke gas after the dioxin is removed through the decomposing furnace enters a preheater for temperature reduction, the smoke gas after the temperature reduction through the preheater enters a kiln-tail desulfurizing device fordesulfurization after passing through a kiln-tail residual-heat boiler, the desulfurized smoke gas is discharged after dust removal, and a desulfurizer is placed in the kiln-tail desulfurizing device.

Description

technical field [0001] The invention relates to a treatment process for sintering flue gas, in particular to a comprehensive treatment process for purifying sintering flue gas and recovering waste heat by utilizing existing cement production equipment. Background technique [0002] Sintering is an important production process of iron and steel enterprises, and the sulfur dioxide emitted by the sintering process accounts for more than 60% of the total emission of iron and steel production. At the same time, the sintering process is also an important source of dioxins in the iron and steel industry. According to statistics, the contents of NOx and dioxins / furans contained in sintering flue gas can be as high as 72-500mg / Nm 3 , 1.5~10ng-TEQ / Nm 3 . Therefore, desulfurization of sintering flue gas and removal of dioxins are the key to realizing SO in the iron and steel industry. 2 and the key to dioxin emission reduction indicators. [0003] At present, the main methods of do...

AI Technical Summary

Problems solved by technology

Although the ammonia / ammonium sulfate method has a denitrification rate of about 30%, it cannot effectively remove dioxins; although the activated carbon method has a significant effect on the removal of dioxins, the device is huge, and the consumption of activated carbon is also large. High operating costs; the by-products of flue gas treatment are poorly utilized, or even cannot be effectively utilized; in addition, the above flue gas treatment technologies cannot effectively recover and utilize the waste heat in the sintering flue gas

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