| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device combining DPF and SCR catalyst capable of satisfactorily mixing urea water and exhaust gas even if there is a limit in distance between the DPF and the SCR catalyst, and homogeneously evaporating and diffusing urea water mixed with the exhaust gas. <P>SOLUTION: The exhaust emission control device includes a catalyst device disposed in an exhaust gas passage of an internal combustion engine and reducing NOx in exhaust gas by ammonia, and a filter disposed at an upstream side of the catalyst device in the exhaust gas passage, and is provided with a fin device and an urea water injection nozzle injecting urea water at the upstream side of the catalyst device and at a downstream side of the filter. In the device, the urea water injection nozzle is inserted into the exhaust gas passage on the downstream side of the filter and on the upstream side of the catalyst device, is disposed near the filter with the tip part directed toward an exhaust gas passage upstream side and passing through the fin device, and an injection port from which urea can be injected to a radial direction of the exhaust gas passage is provided near the tip part. <P>COPYRIGHT: (C)2010,JPO&INPIT |
