Coke oven flue gas desulphurization denitration method

Abstract

The invention belongs to the field of atmosphere pollution control, and provides a coke oven flue gas desulphurization denitration method. the coke oven flue gas desulphurization denitration method comprises following steps: 1, coke oven flue gas is introduced into a hot blast stove to increase the temperature to 250 to 310 DEG C; 2, the heated coke oven flue gas is introduced into a SCR reactor for reaction with ammonia gas on the surface of a catalyst; 3, after removing of nitrogen oxides, the coke oven flue gas is introduced into a heat pipe waste heat boiler, and heat exchange is carried out in the heat pipe waste heat boiler to reduce the temperature of the coke oven flue gas and generate steam, wherein the steam is provided to factories; 4, the cooled coke oven flue gas is introducedinto a desulfurization tower for reaction with ammoniacal liquor in the desulfurization tower; and 5, an obtained mixed solution is introduced into an oxidation tank for oxidation in the oxidation tank, so that ammonium sulfite in the mixed solution is converted into ammonium sulfate through oxidation, and then the coke oven flue gas is introduced into the desulfurization tower. The oxidation tank is arranged outside the desulfurization tower, so that on one hand the ammonia escape rate can be controlled effectively, and on the other hand more complete oxidation is achieved.

Description

technical field [0001] The invention relates to the field of air pollution control, in particular to a coke oven flue gas desulfurization and denitrification method. Background technique [0002] Industrial flue gas usually contains a variety of pollutants, such as sulfur dioxide, nitrogen oxides, dust and heavy metals adhering to the dust, dioxins and other substances, and the moisture in the flue gas will also carry some soluble inorganic salts. The existing flue gas treatment system mainly deals with single pollutants. For such complex flue gas characteristics, the flue gas treatment system is also very complicated, and has the disadvantage of being difficult to respond to load changes in time. [0003] For the removal of sulfur dioxide, the limestone-gypsum method or the ammonia-ammonium sulfate method are commonly used in engineering, but both systems are difficult to deal with nitrogen oxides, and there is a serious phenomenon of alkaline droplets in the outlet flue ga...

AI Technical Summary

Problems solved by technology

The existing flue gas treatment system is mainly aimed at treating a single pollutant. For such complex flue gas characteristics, the flue gas treatment system is also very complicated, and has the disadvantage of being difficult to respond to load changes in a timely manner.

[0003] For the removal of sulfur dioxide, the limestone-gypsum method or the ammonia-ammonium sulfate method are commonly used in engineering, but both systems are difficult to deal with nitrogen oxides, and there is a serious phenomenon of alkaline droplets in the outlet flue gas, causing environmental damage Secondary pollution

For the removal of nitrogen oxides, the traditional methods mainly include selective catalytic reduction and selective non-catalytic reduction. Although the efficiency is high, there are problems such as ammonia leakage and escape.

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