EXHAUST EMISSION CONTROL DEVICE

PROBLEM TO BE SOLVED: To provide a configuration capable of preventing backflow of exhaust gas that has been caused to flow in a bypass passage to a catalyst passage in an exhaust emission control device having a casing in which the catalyst passage and the bypass passage are formed.SOLUTION: An exhaust emission control device 100 includes: a casing 10; SCR catalysts (first SCR catalyst 25 and second SCR catalyst 26); a first backflow prevention plate 31; and a second backflow prevention plate 32. At least part of a catalyst passage 52 and at least part of a bypass passage 53 are formed in the casing 10. The SCR catalysts are disposed in the catalyst passage 52 to selectively reduce NOx included in exhaust gas flowing in the catalyst passage 52. The first backflow prevention plate 31 prevents backflow of exhaust gas from a second exhaust passage 54 to the catalyst passage 52. The second backflow prevention plate 32 is disposed between the SCR catalysts and the first backflow prevention plate 31 to prevent backflow of the exhaust gas.SELECTED DRAWING: Figure 3 【課題】触媒経路とバイパス経路が形成されたケーシングを備える排気ガス浄化装置において、バイパス経路を流れた排気ガスが触媒経路へ逆流することを防止可能な構成を提供する。【解決手段】排気ガス浄化装置１００は、ケーシング１０と、ＳＣＲ触媒（第１ＳＣＲ触媒２５及び第２ＳＣＲ触媒２６）と、第１逆流防止板３１と、第２逆流防止板３２と、を備える。ケーシング１０は、触媒経路５２の少なくとも一部及びバイパス経路５３の少なくとも一部が形成される。ＳＣＲ触媒は、触媒経路５２に配置されており、当該触媒経路５２を流れる排気ガスに含まれるＮＯｘを選択還元する。第１逆流防止板３１は、第２排気経路５４から触媒経路５２への排気ガスの逆流を防止する。第２逆流防止板３２は、ＳＣＲ触媒と第１逆流防止板３１の間に配置されており、排気ガスの逆流を防止する。【選択図】図３