| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device capable of showing high NOx reduction performances right after a stage where exhaust gas temperature reaches activation temperature zone of selective reduction type catalyst even under a condition where exhaust gas temperature is low such as in the case of engine start and low speed travel. <P>SOLUTION: The exhaust emission control device is provided with the selective reduction type catalyst 11 provided with a characteristics making NOx selectively react with ammonia even under existence of oxygen, and an urea water adding valve 14 (urea water adding means) adding urea water 13 as reducer to an upstream side of the selective reduction type catalyst 11, in the middle of an exhaust pipe 10 in which exhaust gas 8 from an engine 1 flows. The device is additionally equipped with an urea water discharge decomposition reactor 18 forcibly decomposing solid of urea to ammonia by discharge plasma and introducing the same to the exhaust pipe 10 at an upstream side of the selective reduction type catalyst 11. <P>COPYRIGHT: (C)2010,JPO&INPIT |
