SIMULTANEOUSLY DESULFURIZING AND DENITRIFYING METHOD

摘要

PURPOSE:To simultaneously and efficiently remove sulfur oxide and nitrogen oxide contained in gas by means of a fluidized bag by introducing the gas containing sulfur oxide and nitrogen oxide as fluidization gas together with a reducing agent into the fluidized bed composed of a reductive denitrification catalyst of coarse particles and a desulfurizing agent of fine particles. CONSTITUTION:A fluidized bed 3 is constituted of a reductive denitrification catalyst of 100-1500mum means particle diameter and a desulfurizing agent of fine particles having 0.5-30mum mean particle diameter. Gas containing sulfur oxide and nitrogen oxide is introuduced into the fluidized bed 3 as fluidization gas together with a reducing agent. The gas is brought into contact with the particles under the fluidization conditions wherein coarse particles are practically held up in the fluidized bed 3 and fine particles are discharged to the outside of the fluidized bed 3 while holding a controlled means residence time. After nitrogen oxide is reduced to nitrogen and sulfur oxide is caught by the desulfurizing agent, both gas from which sulfur oxide and nitrogen oxide have been removed and the desulfurizing agent of fine particles by which sulfur oxide has been caught are discharged from the fuidized bed 3. Moreover the desulfurizing agent of fresh fine particles is replenished to the fluidized bed 3.