EXHAUST GAS PURIFICATION DEVICE OF ENGINE

摘要

An exhaust gas purification device of an engine, comprising a reduction catalyst disposed in an engine exhaust gas system and reducing nitrogen oxides with a liquid reducer for purification, a reducer supply device controlling the flow of the liquid reducer supplied to the reduction catalyst according to the operating conditions of the engine, an injection nozzle fixed to the exhaust gas system through a flange and jetting/ supplying the liquid reducer to the exhaust gas upstream side of the reduction catalyst, and a pipe communicably connecting the reducer supply device to the injection nozzle. The pipe is formed of a ceramics material, or water repellent finishing is applied to the inner wall of at least one of the injection nozzle and the pipe. Thus, the liquid reducer adhered to the inner walls of the pipe and injection nozzle immediately after the injection and supply of the liquid reducer is stopped can be reduced so that the pipe and injection nozzle can be less clogged.