Static mixer of selective catalytic reduction (SCR) denitration system

Abstract

The invention discloses a static mixer of a selective catalytic reduction (SCR) denitration system. The static mixer comprises a pipe body, fins and a nozzle. The static mixer is characterized in that: the nozzle is arranged on the pipe body, the section of each fin is 'V'-shaped, and a plurality of fins are radically arranged in the pipe body, and the fins are made by curving the steel plates into a certain angle. The 'V'-shaped fins are adopted in the static mixer, and the plurality of fins are eccentrically arranged, so that vortex is formed in the pipeline of the mixer to increase disturbance. By calculation and analysis of FIR special design software of automatic vehicle location (AVL), the mixer of the structure has low exhaust back pressure, and fulfills the purposes of fully mixing the jet urea and the jet tail gas without generating high pressure drop.

Description

technical field [0001] The patent of the present invention relates to the field of automobile exhaust systems, and more specifically relates to a static mixer for automobile exhaust pipes. Background technique [0002] At present, pipeline static mixers are more and more widely used in automobiles, and it has become a development trend to improve the mixing of urea and exhaust gas and reduce NOx emissions. Generally speaking, the current exhaust system is required to reduce NOx emissions as much as possible under the premise of satisfying the exhaust back pressure and not losing the effective power of the engine. Therefore, the current automobile exhaust system requires urea water and exhaust gas to be fully mixed before entering the SCR catalytic converter, because only a mixer with high uniformity of urea and exhaust gas can fully react in the SCR catalytic converter , thereby reducing NOx emissions. However, the arrangement of mixers is usually contradictory to reducing...

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Problems solved by technology

[0003] The patent of the present invention is aimed at the disadvantages in the prior art that there is a fluid stagnation area behind the conventional static mixer, the disturbance effect is poor, the mixing effect of tail gas and urea is poor, the concentration distribution is uneven, and the conversion rate and ammonia escape rate are not ideal. , which aims to provide a static mixer for SCR denitrification system, which can not only fully mix the injected urea and exhaust gas without causing a large pressure drop

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