High-efficiency SCR (Selective Catalytic Reduction) barrel type mixer and vehicle adopting mixer

Abstract

The invention discloses a high-efficiency SCR (Selective Catalytic Reduction) barrel type mixer and a vehicle adopting the mixer. A U-shaped mixing pipe and a baffle plate are arranged in an inner cavity of a mixer barrel body of a post-processor of the high-efficiency SCR barrel type mixer, a urea nozzle for spraying urea mist into the U-shaped mixing pipe is arranged on the mixer barrel body of the post-processor, and the U-shaped mixing pipe is arranged in a manner of inclining to the axis direction of the mixer barrel body of the post-processor; the baffle plate is arranged in the inner cavity of the mixer barrel body of the post-processor; and the U-shaped mixing pipe comprises a first pipe body arranged in a first cavity, a middle pipe body and a second pipe body arranged in a second cavity, the middle pipe body is arranged between the first pipe body and the second pipe body and is communicated with the first pipe body and the second pipe body, and the second pipe body is a double-layer porous pipe. According to the high-efficiency SCR barrel type mixer and the vehicle adopting the mixer provided by the invention, the U-shaped mixing pipe is designed in a connecting cavity between a DPF and SCR to promote atomization of a urea water solution, and the second pipe body of the U-shaped mixing pipe is arranged to be the double-layer porous pipe, so that urea mist beams and exhaust gas are further fully mixed, and the requirement for uniformity of ammonia in the mixer is met.

Description

technical field [0001] The invention relates to the technical field of vehicle denitration, in particular to a high-efficiency SCR cartridge mixer and a vehicle using the mixer. Background technique [0002] Selective Catalytic Reduction (Selective Catalytic Reduction, SCR) refers to the use of reducing agents (such as NH3, liquid ammonia, urea) to selectively react with NO in the flue gas under the action of a catalyst. x React and generate non-toxic and non-polluting N 2 and H 2 O. Automotive exhaust systems include an injection system that injects Diesel Exhaust Fluid (DEF) or a reducing agent, such as a solution of urea and water, upstream of an SCR catalyst (Selective Catalytic Reduction Catalyst). A mixer is positioned upstream of the SCR catalyst and mixes engine exhaust gases and urea conversion products. [0003] The Chinese invention patent with the authorized notification number CN 107530655 B discloses a full-rotary mixer, including: a mixer body, which defin...

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Problems solved by technology

[0006]However, the above-mentioned technical solution has the following defects: 1. The design of the post-processor mixer is not compact enough, resulting in a larger overall size of the vehicle post-processor, which increases the cost and occupies a relatively large area. The control is installed on a large vehicle chassis; 2. The mixing distance of the mixer is short, which may easily cause urea to enter the SCR carrier behind without being fully mixed in the mixer, resulting in carrier blockage; 3. The urea solution in the mixer still exists in the early stage of urea spraying Risk of hitting the wall at the first stage, thus causing the risk of urea crystallization blockage

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