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Static mixer for exhaust system

A technology of static mixer and exhaust system, applied in exhaust devices, machines/engines, air quality improvement, etc., can solve the problem of unsatisfactory conversion rate and ammonia escape rate, poor mixing effect of exhaust gas and urea, and uneven concentration distribution and other problems, to achieve the effect of compact structure, good mixing effect and reduced deposition

Inactive Publication Date: 2012-05-09
HANGZHOU YINLUN TECH CO LTD +1
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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. , which aims to provide a static mixer for the exhaust system, which can not only fully mix the injected urea and exhaust gas, but also not generate a large back pressure

Method used

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Embodiment Construction

[0036] Below with reference to the accompanying drawings, through the description of the embodiments, the specific implementation of the patent of the present invention, such as: the shape, structure, and mutual positional relationship and connection relationship between each structure, each role and working principle, etc. are further elaborated. Detailed explanation:

[0037] refer to figure 1 , using an exhaust system of the present invention, including a static mixer of the present invention, 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 3, the mixer rear pipeline 5, the catalytic converter 6 and the catalytic converter rear pipeline 8 are sequentially connected by connecting flanges.

[0038] The two ends of the pipe body 2 are respectively connected with the exhaust pipe and the rear end pipe 5 through connecting flanges 1 and 9 . Said nozzles 4 are a...

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Abstract

The invention provides a static mixer for an exhaust system. A group of wing piece pairs and wing pieces are uniformly distributed in an exhaust pipe; wing piece main bodies and the cross section of a pipe body form a certain included angle; and fins of the wing pieces and the wing piece main bodies also form a certain included angle. By calculation and analysis of special CFD (computational fluid dynamics) software, the mixer can effectively increase the gas disturbance, turbulent flow is obtained after waste gas of an engine and urea drops are treated by the mixer, the waste gas and the urea drops can be fully mixed, higher distribution uniformity is obtained before the mixture enters an SCR (selective catalytic reduction) catalytic converter, and further the mixture reacts fully, so that the content of NOx in the tail gas of a car is reduced. According to the mixer, the mixing effect is good and the exhaust back pressure is low. The mixer is compact in structure and convenience in installation, can be widely applied to an exhaust pipeline of a diesel engine with a urea SCR system.

Description

technical field [0001] The patent of the present invention relates to the field of automobile exhaust systems, and more specifically relates to a static mixer for a vehicle urea SCR system. Background technique [0002] At present, 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 reducing the exh...

Claims

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Application Information

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IPC IPC(8): F01N3/28B01D53/94B01D53/56
CPCY02T10/24Y02A50/20Y02T10/12
Inventor 周小燕孔芬霞李兵许锦皋陆国栋
Owner HANGZHOU YINLUN TECH CO LTD
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