Fire coal flue gas wet method energy-saving desulfurization method

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 sulfur