| 摘要 |
<P>PROBLEM TO BE SOLVED: To uniformize a urea-based liquid reaching a selective reduction type catalyst. <P>SOLUTION: This exhaust emission control device is provided with the selective reduction type catalyst 24 disposed in the exhaust pipe 16 of an engine 11, and a liquid injection nozzle 29 disposed in the exhaust pipe 16 on the upstream side of the selective reduction type catalyst 24 and capable of injecting the urea-based liquid 32 toward the selective reduction type catalyst 24. A mixer 51 for mixing exhaust gas with the liquid 32 injected from the liquid injection nozzle 29 is arranged in the exhaust pipe 16 between the liquid injection nozzle 29 and the selective reduction type catalyst 24. The mixer 51 is provided with a mixer body 52 having a cylindrical part 52a capable of passing exhaust gas in an axis direction, and a plurality of partitioning plates 53 arranged at required intervals in the mixer body 52 to interrupt the passing of exhaust gas in the inside of the cylindrical part 52a and having a plurality of gas holes 53a. The plurality of gas holes 53a are so formed as not to overlap with the plurality of gas holes 53a formed in the adjacent partitioning plates 53 and the axis direction of the cylindrical part 52a. <P>COPYRIGHT: (C)2003,JPO |
