EXHAUST EMISSION CONTROL DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an exhaust emission control device inhibiting accumulation of solids formed from urea water and securing satisfactory exhaust emission control efficiency.

SOLUTION: Communication between an upstream side casing 30 and a downstream side casing 34 is provided by a communication path 32 including a first and a second bending part 32a, 32b, and an ammonia selective reduction NOx catalyst 40 selectively reducing NOx in exhaust gas is held in the downstream side casing 34 as reducing agent. Urea water is injected from an urea water injector 44 to exhaust gas flowing in the communication path 32 from the upstream side casing 30. Part of exhaust gas before its flow direction is changed by the first bending part 32a is prevented from colliding with urea water contained in exhaust gas and an inner wall surface of the communication path 32 by providing a collision plate 50 changing flow direction of colliding exhaust gas toward a downstream side of the first bending part 32a at a position where the exhaust gas collides with the plate before reaching the inner wall surface of the communication path 32 at the first bending part 32a.

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