NOX REDUCING DEVICE USING BYPASS TUBE

摘要

A reducing device of nitrogen oxide using a bypass pipe is provided to maintain reducing efficiency of nitrogen oxide at a low temperature by bypassing a part of exhaust gas and injecting a reducing agent to a front end of the bypass pipe. A reducing device of nitrogen oxide using a bypass pipe comprises the followings: a bypass pipe(20) installed at a side of an exhaust pipe(10), to bypass a part of exhaust gas; an electric heater(50) installed inside the bypass pipe; a reducing agent injecting unit(40) installed in front of the electric heater, to inject a reducing agent; a reducing catalyst carrier(60) installed at a rear of the bypass pipe in the exhaust pipe; and a slip carrier(70) installed at a rear of the reducing catalyst carrier, to remove the reducing agent passed the reducing catalyst carrier but not reacted. The electric heater is coated with a reducing catalyst.