EXHAUST EMISSION CONTROL DEVICE

摘要

An exhaust emission control device has a particulate filter 5 incorporated in an exhaust pipe to capture particulates in exhaust gas 3, a selective reduction catalyst 6 arranged downstream of the particulate filter 5 to selectively react NO x with ammonia even in the presence of oxygen and urea water addition means 12 capable of adding urea water as reducing agent between the catalyst 6 and the filter 5. At least a bent 13, 14 is formed in a passage which guides the exhaust gas 3 from the urea water addition means 12 to the selective reduction catalyst 6.