SCR DE-NOX SYSTEM FOR REDUCING YELLOW PLUME AND NOX UNDER LOW TEMPERATURE OPERATING CONDITION

摘要

PURPOSE: A selective catalytic reduction denitrification apparatus is provided to evaporate and spray a reducing agent using an exhaust gas in high and low temperature regions of an emission pipe under a certain temperature, thereby efficiently removing nitrogen oxide even when the reducing agent requires large amounts of heat during evaporation. CONSTITUTION: A selective catalytic reduction denitrification apparatus comprises: a nozzle unit(120); an evaporation part(140); a valve unit(150); a pump(160); a blower unit(170); a high temperature exhaust gas control valve(181); a low temperature exhaust gas control valve(182); a flow detector(210); a temperature detector(260); and a control unit(190). A catalyst which is a carrier of TiO2/V2O5/WO3 is prepared along an exhaust pipe(10). The exhaust pipe discharges the exhaust gas, which is combusted in and discharged from a gas turbine, through a chimney(20). The nozzle unit is placed on a catalyst member(110). The evaporation part evaporates the reducing agent of the aqueous solution of ammonia series supplied from a storage tank(130) and delivers the reducing agent to the nozzle unit. The high temperature exhaust gas control valve is placed on a pipe that connects the front end of the exhaust pipe and the blower unit to control the amount of the high temperature exhaust gas supplied to the evaporation part. The low temperature exhaust gas control valve is placed on a pipe that connects the rear end of the exhaust pipe and the blower unit to control the amount of the low temperature exhaust gas supplied to the evaporation part. The flow detector detects the flowing amount of the reducing agent which is prepared in the discharge end of the pump and delivered to the evaporation part. The temperature detector detects the temperature of the evaporated reducing agent when discharged.