Fire coal flue gas wet method energy-saving desulfurization method

Abstract

The invention provides a fire coal flue gas wet method energy-saving desulfurization method, and belongs to the technical field of recycle methods of fire coal flue gas. The method comprises the following steps of: firstly, homogenizing a desulfurizing agent and fire coal, transporting into a hearth for combustion, generating various chemical compounds by SO2 generated by the combustion reaction and elements in furnace burden, and discharging the chemical compounds and the furnace burden which is not completely reacted out from the hearth along with furnace slag; absorbing dust in the flue gas and entering a spray tower, and washing the flue gas by an alkaline wash solution for desulfuration; leading discharged wash solution water body to flow into an oxidation pond, discharging to a slag bath along with discharged materials of the hearth, dissolving water-soluble substances discharged out from the hearth by slag washing water body, hydrolyzing to obtain alkaline liquor, carrying out a reaction between sulfuric acid and hydrochloride solutes in the alkaline liquor to generate ocyhydrate precipitates, and jointly taking away by absorbing of the furnace slag; and leading the reacted alkaline liquor to enter a filter tank, pumping into the spray tower after filtering, and circularly washing the flue gas. A desulfurization system used by the invention is simple, the use level of the fire coal can be saved, sewage does not need to be discharged outwards and secondary pollutants can not be additionally discharged in the whole process, the running cost can be reduced, and the desulfuration and the smoke dust treatment can reach the standard.

Description

technical field [0001] The invention relates to a method for recycling coal-burning flue gas, in particular to a wet-process energy-saving desulfurization method for coal-burning flue gas. Background technique [0002] At present, most coal-fired flue gas desulfurization methods use limestone-gypsum wet method (FGD) for desulfurization, and water film dedusting process for dedusting. FGD desulfurization unit includes limestone slurry preparation system, absorption tower system, gypsum dehydration system, waste water treatment system and supporting power plant and spray tower system, etc. The desulfurization of the FGD desulfurization device is insufficient; the structure is complex, the production cost, operation and maintenance costs are high; it is also necessary to purchase related raw materials such as limestone / lime, which increases the production cost; the exhausted flue gas still pollutes the atmosphere; a large amount of sewage needs to be discharged , pollute the e...

AI Technical Summary

Problems solved by technology

The desulfurization of the FGD desulfurization device is insufficient; the structure is complicated, the production cost, operation and maintenance costs are high; limestone / lime and other related raw materials need to be purchased, which increases the production cost; the exhausted flue gas still pollutes the atmosphere; a large amount of sewage needs to be discharged , pollute the environment, and waste water resources

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