Post-treatment SCR mixer for vehicle

Abstract

The invention relates to the technical field of SCR mixers, and discloses a post-treatment SCR mixer for a vehicle. The post-treatment SCR mixer for the vehicle comprises a U-shaped elbow, wherein oneend of the U-shaped elbow is connected with an exhaust inlet, the other end of the U-shaped elbow communicates with an outer cylinder, a flow guide plate is fixedly connected to the interior of the U-shaped elbow, and a cyclone barrel is arranged on the inner side of one end of the outer cylinder. A urea injector is arranged at the end, corresponding to the cyclone barrel, of the outer side faceof the outer barrel. A positioning ring is connected with the inner side of the lower end of the cyclone barrel, a plurality of cyclone blades are distributed on the inner wall of the positioning ring. A turbulent flow bin is welded into the outer barrel and located at the bottom end of the cyclone barrel, and a blocking partition plate is welded to the outer side face of the cyclone barrel and located above the turbulent flow bin. Under the condition that flowing resistance is not increased, the post-treatment SCR mixer for the vehicle enhances the mixing of urea and exhausted tail gas, reduces a flowing dead zone in the mixer, and enhances air disturbance at a urea falling point, so that urea decomposition and evaporation are accelerated, wall surface liquid film is effectively reduced,and urea crystal is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of SCR mixers, in particular to a vehicle after-treatment SCR mixer. Background technique [0002] Urea-SCR (Urea-Selective Catalytic Reduction) is the main technical means to reduce NOx emissions of national six diesel locomotives. It is a technology that uses ammonia and NOx to undergo a catalytic reduction reaction to eliminate nitrogen oxides in diesel engine exhaust. The SCR mixer is set Installed between the exhaust pipe and the SCR carrier, it is mainly used to improve the mixing uniformity between the urea spray and the exhaust gas, increase the evaporation of ammonia gas, and improve the conversion efficiency of NOx; [0003] However, at present, during the use of SCR mixers, the risk of urea crystallization is relatively high, which causes problems such as increased fuel consumption of the vehicle and decreased conversion efficiency of aftertreatment NOx; therefore, those skilled in the art provide...

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Problems solved by technology

[0003] However, at present, during the use of SCR mixers, the risk of urea crystallization is relatively high, which causes problems such as increased fuel consumption of the vehicle and decreased conversion efficiency of aftertreatment NOx; therefore, those skilled in the art provide a kind of SCR mixer for aftertreatment of vehicles , to solve the problems raised in the above background technology

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