WET TYPE DENITRIFYING DEVICE

摘要

PURPOSE: To accomplish the high denitration efficiency using small installation area at reduced installation and the operation cost by providing a bent duct downstream of an oxidizing vessel and spraying alkaline aqueous solution at a point upstream of at least one bent portion of the duct. CONSTITUTION: Tunnel ventilation air containing nitrogen monoxide of 3ppm is lead to an electron beam irradiation reactor 1 to apply electron beam of 0.3kGy to the air by means of an electron beam irradiation device 2. Next, an aqueous solution of potassium carbonate of pH10 is sprayed from a spray nozzle 4 provided at the inlet of bent duct 7 having a sectional area of 1m<2> and total length of 15m which is bent at four points in such a manner that liquid amount-to-gas amount ratio is 0.1kg/m<3> and average particle diameter of liquid droplet is 2mm. If the gas is lead to an outlet 6 through an electrostatic precipitator 5, denitrifying efficiency for the same residence time is higher than in the case of a spray tower, and concentration of liquid droplets in the gas remains unchanged even with higher gas flow velocity than in the spray tower.