| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device surely evaporating added solution without letting it remain around an inner tube and showing good exhaust emission control properties even if a double structure exhaust pipe is adopted near the position where reducer or the like is added. <P>SOLUTION: In the exhaust emission control device, a double pipe structure exhaust pipe 10 on an upstream side of a SCR catalyst unit includes an outer tube 11 having an outer introduction hole 11a introducing urea water to an inside formed thereon, and a tube wall 13a supported with the outer tube 11 on an upstream side of the outer introduction hole 11a and forming an tubular space 12 with the outer tube 11 near the outer introduction hole 11a, and is composed of the inner tube 13 having inner introduction hole 13b for introducing urea water formed thereon, and an outer diffusion member 14 provided between the outer tube 11 and the inner tube 13 to support an end 13c on a downstream side of the inner tube 13 on a downstream of both of the introduction holes 11a, 13b, making exhaust gas and urea water in the tubular space 12 pass through the SCR catalyst unit side, and diffusing and evaporating urea water. <P>COPYRIGHT: (C)2010,JPO&INPIT |
