SETTING OF AMMONIA INJECTION QUANTITY IN WASTE GAS TREATMENT APPARATUS OF REFUSE INCINERATOR

摘要

PROBLEM TO BE SOLVED: To provide a method for setting ammonia injection quantity in order to carry out treatments of desulfurization, denitrification and dioxins removal at a same stage in a waste gas treatment apparatus in a refuse incinerator. SOLUTION: In a waste gas treatment apparatus of a refuse incinerator wherein hydrochloric acid concentration of a waste gas is lowered to a specified level in a lime spray tower and sprayed lime is captured together with ash by an electric precipitator, and then waste gas temperature is controlled within a specified range by a heat exchanger before being guided into an adsorption tower packed with granular active carbon, and the waste gas is brought into contact with the active carbon before being discharged to a flue, SO2 and dioxins are adsorbed by the granular active carbon, NOx is decomposed under the presence of NH3 injected from the heat exchanger into the flue, and parts of them are filtered and removed as NH4 Cl together with dust by an active carbon layer of the adsorption tower. The granular active carbon which has adsorbed SO2 , dioxins and HCl is guided to a desorption tower and heated so as to desorb SO2 , decompose the dioxins and desorb HCl. Quantity of NH3 injection is set on the basis of NOx concentration at an inlet of the adsorption tower and NOx removal rate or NOx concentration at the inlet of the adsorption tower and NOx concentration at an outlet thereof.