EXHAUST EMISSION CONTROL DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an exhaust emission control device equipped with an additive injection valve in an exhaust pipe with a bent part wherein exhaust gas is uniformly mixed with an additive while achieving reduction in heat and can reach a catalyst.

SOLUTION: A bent pipe 12 is connected to the upstream side of an SCR catalyst through a straight pipe. A protrusion 14 protruding to a side opposite from the straight pipe is provided on the bent pipe 12, and the additive injection valve 50 is stored and arranged in an end face 18 of the protrusion 14 so that a center line of the straight line coincides with an axis. A spray angle θ or a protruding distance L of the protrusion 14 is adjusted so that a conical spray F of the injection valve 50 is not adhered to an exhaust gas downstream side end part 15 in a connection opening end of the protrusion 14 with the bent pipe 12.

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