Exhaust aftertreatment mixing device and packaging

Abstract

The invention discloses an exhaust aftertreatment mixing device and packaging. The exhaust aftertreatment mixing device includes a shell and a mixing assembly located in the shell. The mixing assemblyincludes a first plate, a second plate, a third plate and a mixer, wherein the first plate is provided with a first inlet and a second inlet which are separately located on two sides of the first plate, the mixer comprises a raised part, fourth space and fifth space, and the fourth space and the fifth space are located below the raised part. The raised part is provided with a first side edge anda second side edge, wherein the first side edge is provided with a plurality of first through holes communicating third space with the fourth space, and the second side edge is provided with a plurality of second through holes communicating the third space with the fifth space. In this way, heat transfer is enhanced, and resistance to crystallization is improved.

Description

[0001] This application claims the priority of a Chinese patent application with an application date of December 29, 2017, an application number of 201711489594.7, and an invention title of "Exhaust gas post-treatment mixing device and its packaging", the entire content of which is incorporated by reference in this application . technical field [0002] The invention relates to an exhaust gas aftertreatment mixing device and its packaging, belonging to the technical field of engine exhaust aftertreatment. Background technique [0003] Studies have shown that the uniformity of ammonia distribution in the exhaust gas after-treatment system (such as selective catalytic reduction system, SCR system) pipeline has an important impact on the overall performance and durability of the system. If the distribution of ammonia is not uniform, it will lead to excessive ammonia in local areas, which will easily cause ammonia leakage, while in other ammonia-lean areas, the conversion effici...

AI Technical Summary

Problems solved by technology

If the distribution of ammonia is not uniform, it will lead to excessive ammonia in local areas, which will easily cause ammonia leakage, and the conversion efficiency of nitrogen oxides (NOx) will be too low in other ammonia-lean areas.

Uneven distribution of ammonia over a long period of time can lead to uneven catalyst aging, which affects the overall performance of the catalyst

In addition, the uneven distribution of urea droplets will cause the temperature of the local pipe wall or the mixing structure to be too low, forming crystallization, which will block the exhaust pipe in serious cases, resulting in a decrease in engine power performance

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