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scr system and its urea nozzle

A technology of SCR system and urea, which is applied in injection devices, liquid injection devices, mechanical equipment, etc., can solve the problems of urea crystallization and achieve the effect of avoiding urea crystallization

Active Publication Date: 2017-01-25
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, urea crystallization is still prone to occur due to low temperature conditions and inevitable local eddy currents 12

Method used

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  • scr system and its urea nozzle
  • scr system and its urea nozzle
  • scr system and its urea nozzle

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Experimental program
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Effect test

Embodiment Construction

[0035] In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Please refer to figure 2 and image 3 , figure 2 A schematic structural diagram of a specific embodiment of the urea nozzle provided by the present invention; image 3 for figure 2 Schematic diagram of the spraying of the medium urea nozzle.

[0037] In this embodiment, the urea spray head 2 of the SCR system can be installed on the spray head seat 3 of the SCR system to fix the urea spray head 2 . The urea spray head 2 is provided with a urea spray hole 21 capable of spraying urea, figure 2 Among them, the urea injection hole 21 is arranged in the middle of the urea injection head 2, and the injected urea is catalytically converted by a specific catalyst, which can remove most of the nitrogen oxides in the exhau...

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PUM

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Abstract

The invention discloses a silicon controlled rectifier (SCR) system and a urea spray nozzle thereof. The urea spray nozzle is provided with a urea spray hole capable of spraying urea and flow guiding spray ports capable of spraying compressed air, wherein the flow guiding spray ports are arranged around the urea spray hole. A mist beam sprayed by the urea spray hole form eddy around, after the flow guiding spray ports are arranged around the urea spray hole, air beams formed by the compressed air sprayed by the flow guiding spray ports spray disturb the eddy, the flow guiding effect is played on mist droplets to be deflected in the mist beam, and the mist droplets in the mist beam formed by the urea spray hole do not deviate from a preset orbit with the eddy but are led to the required position according to the preset orbit or according to the preset orbit basically to perform reduction reaction, and accordingly a urea crystallization phenomenon is avoided.

Description

technical field [0001] The invention relates to the technical field of aftertreatment systems, in particular to an SCR system and a urea spray head thereof. Background technique [0002] With the increasingly stringent emission regulations, SCR systems have become an indispensable aftertreatment method and have been widely used in Europe and China. [0003] The SCR system is a post-treatment system for nitrogen oxides. A certain amount of urea solution is injected into the exhaust pipe, and most of the nitrogen oxides in the engine exhaust can be removed through the catalytic conversion of a specific catalyst. When spraying the urea solution, it is carried out through the urea spray head. [0004] Please refer to figure 1 , figure 1 It is a spray schematic diagram of a typical urea nozzle. [0005] The urea spray head 11 is provided with a urea spray hole 14 , and urea is sprayed from the urea spray hole 14 . In order to strengthen the reaction effect and improve the un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05B7/08F01N3/20
CPCY02T10/12
Inventor 李云强战强殷海红马雁
Owner WEICHAI POWER CO LTD