SCR (Selective Catalytic Reduction) catalytic conversion muffler

Abstract

The invention discloses an SCR (Selective Catalytic Reduction) catalytic conversion muffler, which comprises a front cavity body, a carrier cavity body, a back cavity body and an air outlet pipe that are sequentially and coaxially connected, wherein a catalyst carrier is arranged in the carrier cavity body; a catalyst is coated on the catalyst carrier; a porous air inlet pipe is vertically arranged on the front cavity body; through holes which are uniformly and circumferentially arranged are arranged on the pipe wall of the porous air inlet pipe located in the front cavity body. The SCR catalytic conversion muffler is characterized in that the bottom of the porous air inlet pipe is hung in the air; and a closed end cover is arranged at the bottom of the porous air inlet pipe. According to the SCR catalytic conversion muffler disclosed by the invention, a urea solution is effectively prevented from crystallizing, and the atomization degree of the urea solution is improved. Meanwhile, the air inlet pipe is vertically arranged so that the overall structure of the catalytic conversion muffler is more compact, the condition that the catalytic reduction reaction is affected by deposited particles in an exhaust gas flow blocking a carrier passage is avoided. While the porous air inlet pipe effectively reduces system noises, the distribution uniformity of reactants in the carrier can be remarkably improved, thereby effectively improving the catalytic conversion of tail gas.

Description

technical field [0001] The invention relates to the field of automobile exhaust systems, in particular to an automobile SCR post-treatment system, and more specifically to an SCR catalytic conversion muffler. Background technique [0002] At present, the SCR aftertreatment system is more and more widely used in the field of heavy diesel engine aftertreatment. Generally speaking, the existing catalytic conversion mufflers are 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 that the urea water can be fully atomized and pyrolyzed before reaching the catalyst carrier, and fully mixed with the exhaust gas, and then fully react on the surface of the carrier in the SCR catalyst to reduce NOx emissions. Purpose. The catalytic converter muffler in which the intake pipe and the carrier are vertically arranged can b...

AI Technical Summary

Problems solved by technology

The catalytic converter muffler in which the intake pipe and the carrier are vertically arranged can better meet the loading requirements of the engine and make the structure of the whole reaction device more compact. However, a prominent problem of this structure is that after the exhaust gas enters the catalytic converter through the intake pipe, the The distribution uniformity in the catalyst carrier is relatively low, which affects the conversion rate of NOx

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