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Urea injection device for engine SCR system

A technology of SCR system and urea injection, which is applied to engine components, combustion engines, machines/engines, etc., can solve problems such as urea crystallization, achieve the effects of improving stability, avoiding direct contact, and avoiding residual dead ends

Active Publication Date: 2017-04-26
WEICHAI POWER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to effectively solve the problem of wall-attached crystallization of urea at the gas path check valve in the mixing chamber of the urea pump, the present invention proposes a urea injection device for the engine SCR system, which can reduce vehicle failures and improve the stability of the SCR injection system and reliability

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  • Urea injection device for engine SCR system
  • Urea injection device for engine SCR system

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Embodiment Construction

[0023] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0024] According to the embodiment of the present invention, such as figure 1 As shown, a urea injection device for engine SCR system is proposed, including urea liquid path, gas path, mixing chamber and nozzle, one end of the mixing chamber communicates with the gas path, and the other end of the mixing chamber communicates with the nozzle , the other inlet end of the mixing chamber communicates with the urea liquid path, the outl...

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Abstract

The invention relates to a urea injection device for an engine SCR system. The urea injection device comprises a urea liquid way, a gas way, a mixing chamber and a nozzle. One inlet end of the mixing chamber communicates with the gas way, and the other inlet end of the mixing chamber communicates with the urea liquid way. The outlet end of the mixing chamber communicates with the nozzle. A gas way one-way valve is arranged on the gas way. A liquid way one-way valve is arranged on the urea liquid way. Gas in the gas way enters the mixing chamber in the horizontal flowing direction. A urea solution in the urea liquid way is vertically injected into the mixing chamber. By the adoption of the urea injection device for the engine SCR system, the problem that the urea at the urea pump mixing chamber is attached to the wall of the gas way one-way valve and crystallized is solved effectively, the whole vehicle failure rate can be lowered, and the stability and reliability of the SCR injection system are improved. The invention further relates to the engine SCR system with the urea injection device.

Description

technical field [0001] The invention belongs to the technical field of engine exhaust post-treatment systems, and in particular relates to a urea injection device for an engine SCR system and an engine SCR system including the urea injection device. Background technique [0002] SCR catalytic reduction technology is an important technical route to reduce NOx emissions from diesel engines and meet National IV and above emission regulations. The basic working principle of the SCR system is that the exhaust gas flows out of the turbocharger and enters the exhaust pipe, and at the same time, the urea injection unit installed on the exhaust pipe sprays a certain amount of urea aqueous solution into the exhaust pipe in the form of mist. The urea droplets undergo hydrolysis and pyrolysis reactions under the action of high-temperature exhaust gas to generate the required reducing agent ammonia, which selectively reduces nitrogen oxides to nitrogen under the action of the catalyst. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N3/28B01D53/90B01D53/86B01D53/56
CPCB01D53/8631B01D53/90B01D2251/2067B01D2258/01B01D2259/124F01N3/2066F01N3/28F01N2610/02F01N2610/14F01N2610/1453Y02A50/20Y02T10/12
Inventor 郑志强王飞张建华宋勃震安丽花
Owner WEICHAI POWER CO LTD
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