DEVICE FOR PURIFYING EXHAUST GAS OF ENGINE

摘要

Disclosure is made of removal of a reducing agent component, which is deposited in an exhaust passage of an engine as a result that a supplied reducing agent is attached to the inside of the exhaust passage. An exhaust emission purifying apparatus for an engine having: a reduction catalytic converter 5 disposed in an exhaust system of the engine, for reductively purifying nitrogen oxides in the exhaust emission with a reducing agent; an injection nozzle 7 for injection-supplying the reducing agent to an exhaust upstream side of the reduction catalytic converter in an exhaust pipe 3 of the exhaust system; and a reducing agent supply device 8 supplying the reducing agent to the injection nozzle 7, in which a recess portion 14 is formed on an inner wall on a lower portion of the exhaust pipe 3, by concaving a site to which at least the reducing agent injection-supplied from the injection nozzle 7 is attached, and also, a bottom wall 15 of the recess portion 14 is made detachable.