Semi-slotted hole tube type urea mixing device

Abstract

The invention relates to a semi-slotted hole tube type urea mixing device. The semi-slotted hole tube type urea mixing device comprises a urea nozzle, a cyclone tube assembly, a Z-shaped partition plate, a cyclone plate, an inner cylinder assembly and an outer cylinder assembly, wherein the urea nozzle is mounted on the outer cylinder assembly, the cyclone tube assembly is inserted into a hole inthe Z-shaped partition plate and welded, then the cyclone tube assembly and the cyclone plate are plugged into the inner cylinder assembly together, the outer cylinder assembly is taken as a heat insulation part and arranged on the outer side of the inner cylinder assembly in a sleeving manner, and the urea nozzle is arranged at the upper end of the outer cylinder assembly. The mixing device can realize mixing of urea and airflow and improve the distribution uniformity of ammonia gas on the end surface of an SCR carrier.

Description

technical field [0001] The invention belongs to the technical field of urea mixing devices, in particular to a half-slot tube type urea mixing device. Background technique [0002] In the SCR system application technology, how to uniformly mix the injected urea and engine exhaust gas and complete the secondary crushing of urea and reduce the risk of crystallization of urea at the mixer position is the key to the entire development process. The U-shaped post-processor is a key component of the commercial vehicle post-treatment system in the National VI emission stage, and its urea mixing device is still immature. [0003] Common mixing units mostly use fin structures or fiber units to achieve crushing. Due to the difficulty of micro-fin processing and other problems, the fin structure mostly adopts a large fin structure, and the crushing effect on urea is limited. In recent years, the problem of crushing and crystallizing urea has also been achieved by using a swirl structu...

AI Technical Summary

Problems solved by technology

In recent years, the problem of crushing and crystallization of urea has also been achieved by using a swirl structure. However, when the swirl structure is applied to U-shaped post-treatment, the direction of the swirling airflow is perpendicular to the direction of the airflow in the SCR catalyst, so it is difficult to ensure that NH3 is in the SCR. Uniformity of catalyst end face distribution

At the same time, due to the limited ability of the cyclone structure to crush urea, it is difficult to quickly decompose urea.

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