| 摘要 |
<P>PROBLEM TO BE SOLVED: To preliminarily avoid risk of toxic vaporized gas being highly concentrated in a urea water tank. <P>SOLUTION: In the middle of an exhaust tube 9, a selective reduction type catalyst 10 capable of selectively causing NOx to react with ammonia even in coexistence with oxygen is installed, and urea water 17 from the urea water tank 14 is added as reducer on the upstream side of the selective reduction type catalyst 10 in this exhaust emission control device. The urea water tank 14 is provided with a gas extracting line 18 to properly extract vaporized gas 17' from a gas phase part in the tank to be introduced to the upstream side of the selective reduction type catalyst 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
