Mixing device for diesel engine urea SCR system

A technology of SCR system and mixing device, applied in mixers, mufflers, exhaust devices, etc., can solve the problems of ammonia leakage and low conversion efficiency, and achieve the effect of reducing crystallization, easy processing and installation, and compact structure

Active Publication Date: 2011-06-08
HANGZHOU YINLUN TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the urea SCR system is being promoted and applied all over the world, there are still many problems to be solved, such as: how to improve the conversion ef

Method used

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  • Mixing device for diesel engine urea SCR system
  • Mixing device for diesel engine urea SCR system
  • Mixing device for diesel engine urea SCR system

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Example Embodiment

[0020] In the following, with reference to the drawings, through the description of the embodiments, the specific implementation of the present invention, such as: the shape and structure of each structure, the mutual positional relationship and connection relationship between each part, the function and working principle of each part, etc. The detailed description:

[0021] The present invention is a mixing device used in a diesel engine urea SCR system, which uses a mixer to guide the gas flow in an automobile exhaust pipe, forms a strong turbulence at the nozzle outlet and in the direction of the spray axis, and promotes the urea aqueous solution to better interact with the automobile Exhaust gas mixing to improve the uniformity of ammonia distribution and NO in the exhaust pipe X The conversion efficiency can further reduce the NOx content in the exhaust gas, and at the same time can reduce the formation of urea crystals.

[0022] Reference image 3 , The static mixer of the di...

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Abstract

The invention discloses a mixing device for diesel engine urea SCR system, comprises a tube body, a mixer fin device and a nozzle. The invention is characterized in that: the nozzle is arranged on the central axis of the tube body; the mixer fin device adjoins to the nozzle and is installed at the front end of the nozzle; the mixer fin device is composed of a set of fins; the main body of the fins is a sector structure twisting along the air-flow direction, and the arrangement direction of the fins is consistent with the spray axis direction; a set of inclined flow deflector is arranged in each fin. The mixer fin device of the invention guides the air-flow to flow to the center along the fin direction, and strong flow-disturbing can be formed in the fan-shaped center end to promote atomization and mixing of the spray at the nozzle exit, thereby fully mixing the urea aqueous solution injected from the nozzle and the tail gas before flowing into SCR catalytic reactor, reducing urea crystallization on the wall surface, at the same time, the mixing device is compact in structure, easy to process and install and the effect of the device is verified by calculation and analysis by means of special-purpose design software.

Description

technical field [0001] The patent of the present invention relates to the field of diesel engine exhaust aftertreatment system, and more specifically relates to a mixing device for diesel engine urea SCR system. Background technique [0002] As countries around the world have stricter requirements on diesel engine emissions, diesel particulate matter (PM) and NO X Emission control has become a key technology for the development of diesel engines. At present, there are two different routes for diesel engine exhaust after-treatment technology for diesel engines to meet the requirements of my country's National IV emission regulations: one is to reduce the NOx emissions of engine cylinder combustion through exhaust gas recirculation (EGR) technology, and then use diesel particulate filter (DPF) to control PM; the other is to reduce PM emissions from combustion in the engine cylinder through high-pressure fuel injection technology, and then use selective catalytic reduction tech...

Claims

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Application Information

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IPC IPC(8): B01D53/94B01D53/56B01F5/06F01N3/10
Inventor 陈镇陆国栋周小燕帅石金赵彦光
Owner HANGZHOU YINLUN TECH CO LTD
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