Parallel cylinder type aftertreatment structure assembly

Abstract

The invention relates to the field of diesel engine tail gas aftertreatment, in particular to a parallel cylinder type aftertreatment structure assembly. The parallel cylinder type aftertreatment structure assembly comprises a first cylinder, a second cylinder, and a connecting pipe for connecting the two cylinders; a first-grade SCR carrier and a second-grade SCR carrier are mounted in the firstcylinder in sequence; a small-head end of a right end cover is welded with the other end of the connecting pipe, and a large-head end is connected with one end of the second cylinder; an intake end cover is arranged at the other end of the second cylinder; the outer wall of the second cylinder is of a segmented structure, and all the sections are connected through hoops; and a DPF carrier and a DOC carrier are arranged between the right end cover and the intake end cover in the second cylinder in sequence. A cyclone mixing pipe is arranged in the connecting pipe. DOC, DPF and SCR are integrated as an aftertreatment circuit; and urea water solution is used as a reducing agent for spraying into an exhaust system to decompose as ammonia in waste gas currents for reaction with nitric oxides under the effect of a catalyst to finally convert to harmless nitrogen and water so as to achieve the effect of purifying vehicle tail gas.

Description

technical field [0001] The invention belongs to the field of aftertreatment of diesel engine exhaust, in particular to a parallel barrel type aftertreatment structure assembly. Background technique [0002] With the advancement of increasingly stringent emission regulations, the pace of energy conservation and emission reduction upgrades is accelerating, and the implementation of Euro VI emission standards for diesel vehicles is imminent. To the Euro VI stage, the emission requirements can no longer be met only by internal purification. The currently used Euro VI post-treatment route is: the combination of oxidation catalytic converter (DOC), particulate filter (DPF) and selective catalytic reduction converter (SCR) to realize the treatment of particulate matter (PM) and nitrogen in diesel vehicle exhaust. Strict control of oxides (NOx). [0003] At present, when traditional SCR technology is applied to Euro VI products, the uniformity of NH3 is not easy to meet the design...

AI Technical Summary

Problems solved by technology

[0003] At present, when traditional SCR technology is applied to Euro VI products, the uniformity of NH3 is not easy to meet the design requirements, the design is difficult, and urea crystallization is easy to occur

Moreover, most domestic Euro VI products have disadvantages such as large space occupation, inconvenient disassembly, inflexible installation, and poor versatility in loading and unloading.

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