Patent ID: 8916101
Filing Date: 2014-12-23
Classification: B01D,B01F,F01N,Y02T

Abstract:
1. A reducing agent aqueous solution mixing device for adding a reducing agent aqueous solution to an exhaust gas, the reducing agent aqueous solution mixing device being adapted to be disposed between a filter for trapping particulate substance in the exhaust gas and a reducing catalyst unit for reducing and purifying nitrogen oxide in the exhaust gas, the reducing agent aqueous solution mixing device comprising: an exhaust pipe including an elbow part having a curved portion, and a linear part disposed on an exhaust downstream side of the elbow part; an injector disposed outside the curved portion of the elbow part, the injector being configured to inject the reducing agent aqueous solution into the elbow part towards the linear part; a mixing pipe having a plurality of openings on an outer peripheral surface thereof, the mixing pipe being disposed inside the elbow part to enclose a surrounding of the reducing agent aqueous solution injected from the injector; and an inner pipe disposed inside the linear part of the exhaust pipe on an exhaust downstream side of the mixing pipe, the inner pipe being a separate member from the mixing pipe and spaced apart from an exhaust downstream side outlet portion of the mixing pipe in a direction along an exhaust stream, the inner pipe being spaced apart from an inner wall of the linear part and configured to allow the exhaust gas to flow through an inside thereof and an outer periphery thereof, the linear part of the exhaust pipe, the mixing pipe, and the inner pipe being cylindrical in shape and arranged coaxially with respect to one another.