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Vehicle urea SCR (Selective Catalyctic Reduction) system and static mixer thereof

A technology of SCR system and static mixer, which is applied in the direction of machines/engines, chemical instruments and methods, mechanical equipment, etc. It can solve the problem of unsatisfactory conversion rate and ammonia escape rate, poor mixing effect of tail gas and urea, uneven concentration distribution, etc. problems, to achieve the effect of compact structure, good mixing effect and reduced deposition

Active Publication Date: 2012-02-01
HANGZHOU YINLUN TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The patent of the present invention is aimed at the disadvantages in the prior art that there is a fluid stagnation area behind the conventional static mixer, the disturbance effect is poor, the mixing effect of tail gas and urea is poor, the concentration distribution is uneven, and the conversion rate and ammonia escape rate are not ideal. , aiming to provide a static mixer for urea SCR system for vehicles, which can not only fully mix the injected urea and exhaust gas without causing a large pressure drop

Method used

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  • Vehicle urea SCR (Selective Catalyctic Reduction) system and static mixer thereof
  • Vehicle urea SCR (Selective Catalyctic Reduction) system and static mixer thereof
  • Vehicle urea SCR (Selective Catalyctic Reduction) system and static mixer thereof

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Embodiment Construction

[0021] The specific implementation of the patent of the present invention, such as: the shape and structure of each structure, the mutual positional relationship and connection relationship between each part, the role and working principle of each part, etc. Further detailed instructions:

[0022] refer to figure 1 , The present invention patents a urea SCR system for vehicles, including a static mixer, a nozzle 4, a pipeline 5 at the rear end of the mixer, a catalytic converter 6 and a pipeline 8 after the catalytic converter. The exhaust pipeline, the static mixer, the mixer rear pipeline 5, the catalytic converter 6 and the catalytic converter rear pipeline 8 are sequentially connected by connecting flanges.

[0023] The static mixer of the present invention utilizes exhaust gas and urea to be fully disturbed and mixed after passing through the mixer, to obtain high uniformity before entering the SCR catalytic converter, and then to carry out sufficient reaction to reduce ...

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Abstract

The invention discloses a static mixer of a vehicle urea SCR (Selective Catalyctic Reduction) system, which is characterized in that one group of fins is arranged in an exhaust pipe in a helical step manner, and the fins and the cross section of a pipe body are arranged at a certain included angle. Through calculation and analysis of special CFD (Computational Fluid Dynamics) software, the staticmixer can effectively increase gas disturbance to ensure that engine waste gas and urea drops are fully mixed through the mixer, obtain better distribution uniformity before entering an SCR catalyticconverter and fully react to reduce the content of NOx in the tail gas of a vehicle. The static mixer has a better mixing effect, small exhaust backpressure and a compact structure, is convenient forinstallation, and can be widely applied to a diesel engine exhaust pipeline with the urea SCR system.

Description

technical field [0001] The patent of the present invention relates to the field of automobile exhaust system, and more specifically relates to a vehicle urea SCR system and a static mixer thereof. Background technique [0002] At present, pipeline static mixers are more and more widely used in automobiles, and it has become a development trend to improve the mixing of urea and exhaust gas and reduce NOx emissions. Generally speaking, the current exhaust system is required to reduce NOx emissions as much as possible under the premise of satisfying the exhaust back pressure and not losing the effective power of the engine. Therefore, the current automobile exhaust system requires urea water and exhaust gas to be fully mixed before entering the SCR catalytic converter, because only a mixer with high uniformity of urea and exhaust gas can fully react in the SCR catalytic converter , thereby reducing NOx emissions. However, the arrangement of mixers is usually contradictory to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/24B01D53/94B01D53/56
CPCY02T10/24Y02A50/20Y02T10/12
Inventor 周小燕陆国栋孔芬霞李兵张婷
Owner HANGZHOU YINLUN TECH CO LTD
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