EXHAUST GAS PURIFICATION SYSTEM

Provided is an exhaust gas purification system capable of performing desired exhaust gas purification treatment by preventing the deposition of white products. This exhaust gas purification system isconfigured to comprise, in an exhaust pipe constituting an exhaust path of an internal combustion engine, a selective reducing-type catalyst device and a reducing agent injector which injects a reducing agent. A flexure section provided with the reducing agent injector is formed upstream of the selective reducing-type catalyst device in the exhaust pipe in the flow direction of an exhaust gas passing through the exhaust pipe, an inner pipe having a smaller inner diameter than the exhaust pipe is disposed upstream of the flexure section of the exhaust pipe, and a gap through which the exhaust gas passes is provided between the exhaust pipe and the inner pipe. 本发明提供能够防止白色生成物堆积而实施所希望的废气净化处理的废气净化系统。废气净化系统构成为在构成内燃机的排气通道的排气管中具备选择性催化还原装置以及喷射还原剂的还原剂喷射器。在通过排气管的废气的流动方向上，在排气管中的选择性催化还原装置的上游侧形成有设置有还原剂喷射器的弯曲部；在流动方向上，在排气管中的弯曲部的上