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Dual-swirl inclined cylindrical type urea mixer and application in exhaust after-treatment device thereof

A double swirl and mixer technology, which is applied in the direction of exhaust treatment, exhaust device, noise reduction device, etc., can solve the problems of reducing the risk of urea crystallization, and achieve the effect of reducing the risk of crystallization, improving the uniformity and reducing the risk

Inactive Publication Date: 2019-03-22
WUXI WEIFU LIDA CATALYTIC CONVERTER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The double-swirl oblique barrel-type urea mixer of the present invention can not only reduce the risk of urea crystallization, but also significantly improve the urea mixing effect and urea decomposition rate, and can solve the problems of urea mixing, decomposition and crystallization in the SCR system

Method used

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  • Dual-swirl inclined cylindrical type urea mixer and application in exhaust after-treatment device thereof
  • Dual-swirl inclined cylindrical type urea mixer and application in exhaust after-treatment device thereof
  • Dual-swirl inclined cylindrical type urea mixer and application in exhaust after-treatment device thereof

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Experimental program
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Embodiment Construction

[0025] Double-swirl oblique cylindrical urea mixer, including Z-shaped partition 1, swirl pipe 2, cylinder body 3, nozzle base 4, swirl plate 5, blocking cover 6 and urea nozzle 7, the urea nozzle 7 is installed On the nozzle base 4, the two are obliquely installed on the cylinder body 3, and the blocking cover 6 is welded on the swirl tube 2, and the two are integrated and obliquely welded on the Z-shaped plate 1.

[0026] The swirl plate 5 is installed behind the swirl tube 2 and in front of the SCR catalyst carrier.

[0027] A gap of 2 mm is left between the outlet of the swirl tube 2 lower part and the plugging cover 6 to facilitate the rapid flow of urea particles through the swirl tube 2 .

[0028] The Z-shaped plate 1 and the swirl tube 2 have an included angle with the installation direction, which reduces the influence of the self-weight of urea particles on the position of the wall, and greatly reduces the risk of crystallization at the bottom of the swirl tube 2 . ...

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Abstract

The invention relates to a dual-swirl inclined cylindrical type urea mixer and application in an exhaust after-treatment device thereof, and belongs to the technical field of tail gas after-treatmentof diesel engines. The double-swirl inclined cylindrical type urea mixer comprises a Z-shaped partition plate, a swirl tube, a cylinder body, a nozzle base, a swirl plate, a blocking cover and a ureanozzle, the urea nozzle is mounted on the nozzle base, both of the urea nozzle and the nozzle base are obliquely mounted on the cylinder body; and the blocking cover and the swirl tube are welded intoa whole and obliquely welded to the Z-shaped plate. According to the application of the dual-swirl inclined cylindrical type urea mixer in the exhaust after-treatment device, the exhaust after-treatment device is in a cylinder shape, and sequentially comprises an air inlet pipe assembly, a DOC assembly, a DPF assembly, the double-swirl inclined cylindrical type urea mixer, a SCR assembly and an air outlet pipe assembly in the air flow direction. According to the double-swirl inclined cylindrical type urea mixer, two swirl devices are adopted, the mixing effect of urea and waste gas is ensured, and the crystallization risk of the urea is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of post-treatment of diesel engine exhaust, and in particular relates to a double-swirl oblique barrel-type urea mixer and its application in an exhaust post-treatment device. Background technique [0002] In the SCR system application technology, how to uniformly mix the injected urea and engine exhaust gas and reduce the risk of crystallization of urea at the mixer position is the key to the whole development process. The conventional urea mixer structure has problems such as easy crystallization of urea, low urea decomposition efficiency, and uneven mixing. [0003] Conventional urea mixers usually use fin structures to disturb the parallel airflow to achieve mixing of urea and exhaust gas. In recent years, in order to reduce the risk of crystallization of urea on the wall of the mixer, swirl vane structure or swirl tube structure has been gradually adopted to form swirling airflow, so as to achieve bett...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N3/28
CPCF01N3/2066F01N3/28F01N2610/02Y02T10/12
Inventor 陈增响张俊超
Owner WUXI WEIFU LIDA CATALYTIC CONVERTER
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