Compact-type mixing device capable of meeting Euro-VI emission standard

Abstract

The invention belongs to the technical field of the diesel engine tail gas posttreatment, and relates to a compact-type mixing device capable of meeting a Euro-VI emission standard. The compact-type mixing device comprises a gas inlet pipe, a urea nozzle, a housing, a transition pipe, and a cone, wherein the gas inlet pipe and the urea nozzle are welded at one side of the housing, and a certain included angle is formed between the gas inlet pipe and the urea nozzle, the other side of the housing is welded with the transition pipe, and the transition pipe is welded with the cone; the housing isinternally provided with a rotational flow pipe, and the tail end of the transition pipe is provided with an insert mixer. Through using the rotational flow pipe and the insert mixer, the effect of mixing and crushing is better, so the mixing uniformity is better, a risk of urea crystallization is greatly reduced, and the efficient and stable operation of an SCR can be guaranteed.

Description

technical field [0001] The invention relates to a mixing device, in particular to a compact mixing device meeting Euro VI emission standards, and belongs to the technical field of aftertreatment of diesel engine exhaust. Background technique [0002] With the development of the national emission standards for diesel vehicle exhaust pollutants to the Euro VI stage, more stringent emission standards have stricter definitions for exhaust pollutants. SCR (Selective Catalytic Reduction Converter) technology has become the first choice of major domestic OEMs. The SCR technology sprays urea solution into the exhaust gas, and the urea solution is then pyrolyzed into ammonia gas at high temperature. The ammonia gas reacts with NOx in the exhaust gas under the catalysis of platinum, palladium and other precious metals in the SCR carrier coating, making its concentration large. The range is reduced, so that the exhaust gas can be treated to meet the Euro VI emission standards. [000...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems existing in the existing SCR technology, and provide a compact mixing device that meets the Euro VI emission standard. The mixing device uses a swirl tube to fully mix the exhaust gas and urea, and uses an insert mixer to , the urea particles are crushed and evenly brought to the front end of the SCR carrier, which solves the problems existing in the existing SCR technology

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