Barrel type compact mixer for diesel engine tail gas treatment

Abstract

The invention discloses a barrel type compact mixer for diesel engine tail gas treatment. The mixer comprises an outer shell body and a mixing pipe arranged in the outer shell body and arranged in thelength direction of the outer shell body. The outer shell body is divided into a first cavity and a second cavity through a plurality of baffle plates, wherein the first cavity and the second cavitydo not communicate with each other; a nozzle mounting seat and a waste gas inlet are formed in one end, located on the first cavity, of the outer shell body; two openings are formed in the two ends ofthe mixing pipe, and one end of the mixing pipe is connected to the nozzle mounting seat; the mixing pipe penetrates through the first cavity and extends into the second cavity; a plurality of swirlblades are arranged in the portion, positioned in the first cavity, of the mixing pipe; and a steel wire mesh used for enhancing the crushing and decomposition of urea is arranged in one end, extending into the second cavity, of the mixing pipe. According to the mixer, the steel wire mesh is arranged in the mixing pipe, so that the problem of urea crystallization and low conversion efficiency of acarrier is effectively solved. The mixer not only has the advantages of simple structure and ingenious design, but also is convenient to machine, low in machining cost, and more suitable for industrial application.

Description

technical field [0001] The invention belongs to the post-treatment technology of diesel engine exhaust gas, in particular to a cartridge type compact mixer used for diesel engine exhaust gas treatment. Background technique [0002] SCR (Selective Catalyst Reduction) for diesel engine selective catalytic conversion system refers to a catalytic reduction device installed in the exhaust system of diesel vehicles to catalytically reduce NOx in diesel engine emissions into N2 and O2, and urea aqueous solution is selected as the reducing agent. Urea aqueous solution is injected into the exhaust pipe upstream of the catalyst, and is hydrolyzed into CO under the action of exhaust gas temperature and airflow 2 And ammonia, ammonia as a reducing agent to reduce NOx into pollution-free nitrogen and water. [0003] The mixer is an essential and important part of the SCR system, which is used for NH 3 Mixing with exhaust gas, and the key technology of SCR system lies in NH 3 The unifo...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a cartridge type compact mixer for diesel exhaust gas treatment to solve the problem that urea crystals are easily formed at the bottom of the spherical plug in prior art mixers for diesel exhaust aftertreatment

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