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Engine exhaust aftertreatment mixing device

A tail gas post-treatment and mixing device technology, which is applied to exhaust devices, exhaust treatment, engine components, etc., can solve the problems of poor gas flow rate distribution uniformity, urea crystallization, high mixing uniformity, and poor mixing uniformity

Active Publication Date: 2020-10-20
无锡亿利环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the disadvantages of poor gas flow velocity distribution uniformity, easy formation of urea crystals, poor mixing uniformity, and large gas flow pressure drop in the existing tail gas post-treatment mixing device, the applicant provides a tail gas post-treatment mixing device with a reasonable structure. High homogeneity, low risk of crystallization, high mixing uniformity and low airflow pressure drop

Method used

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Experimental program
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Effect test

Embodiment 1

[0045] Such as figure 1 , figure 2 , image 3 As shown, the inner cavity of the cylindrical outer shell 1 of the present invention is provided with an inner shell 4, and the inner shell 4 is located in the middle and lower part of the inner cavity; Figure 4 As shown, the inner shell 4 divides the inner cavity of the outer shell 1 into an air inlet cavity 9 located outside the inner shell 4 and an air outlet cavity 10 located inside the inner shell 4; the upper surface of the inner shell 4 is provided with a through air inlet 11 , The air inlet 11 communicates with the air inlet cavity 9 and the air outlet cavity 10. Such as figure 1 , image 3 As shown, the front end face of the inner shell 4 is provided with a front baffle 3, such as figure 2 , image 3 As shown, a rear baffle 5 is fixed at the rear end of the inner shell 4, and the rear baffle 5 is welded and fixed to the outer shell 1; the outer shell 1 is provided with a nozzle seat 2 above the air inlet 11, the nozzle sea...

Embodiment 2

[0054] Such as Figure 5 , Image 6 As shown, the inner cavity of the outer shell 1 is provided with an inner shell 4, which is located in the middle and lower part of the inner cavity; the inner shell 4 divides the inner cavity of the outer shell 1 into an air inlet cavity 9 located outside the inner shell 4, And an air outlet cavity 10 located inside the inner shell 4; the upper surface of the inner shell 4 is provided with a through air inlet 11, which communicates with the air inlet cavity 9 and the air outlet cavity 10. The front end of the inner shell 4 is covered with a front baffle 3, the rear end of the inner shell 4 is fixed with a rear baffle 5, and the rear baffle 5 is welded and fixed to the outer shell 1; the front and rear sides of the air inlet 11 of the inner shell 4 The first shielding plate 17 and the second shielding plate 19 are respectively fixedly arranged. The upper ends of the first shielding plate 17 and the second shielding plate 19 are fixed on the ho...

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Abstract

The invention discloses an engine tail gas aftertreatment mixing device. An inner housing divides the interior of an outer housing into a gas inlet cavity and a gas outlet cavity, wherein a gas inletcommunicating with the gas inlet cavity and the gas outlet cavity is formed in the inner housing; a front baffle is arranged on one end face of the inner housing; a rear baffle is arranged at the other end of the inner housing; and a gas outlet is formed in the position, corresponding to the inner housing, of the rear baffle. According to the engine tail gas aftertreatment mixing device, the gas inlet cavity and the gas outlet cavity directly communicate through the gas inlet in the inner housing, no other blocking element exists between the gas inlet cavity and the gas outlet cavity, tail gasflow in the gas inlet cavity can smoothly enter the gas outlet cavity, the gas flow pressure drop is small, the tail gas flow entering the gas inlet cavity directly blows the wall face of the front baffle and the outer wall face of the inner housing and preheats all the wall faces, urea liquid drops falling on all the wall faces sufficiently absorb heat and volatilize, the urea crystallization risk is reduced, the volatilization rate of the urea liquid drops is increased, and then the NOX conversion efficiency is improved.

Description

Technical field [0001] The invention relates to the technical field of engine exhaust gas aftertreatment, in particular to an engine exhaust gas aftertreatment mixing device. Background technique [0002] At present, in the engine exhaust gas aftertreatment system, the selective catalytic reduction technology (SCR) is usually used for the aftertreatment of the engine exhaust emissions. The exhaust gas aftertreatment mixing device is sprayed into the urea aqueous solution, and the urea aqueous solution is decomposed into Ammonia (NH 3 ), under the action of the catalyst, ammonia (NH 3 ) The nitrogen oxides (NO X ) Reduced to harmless nitrogen (N 2 ) And water (H 2 O), finally discharged from the exhaust pipe, so as to achieve the purpose of reducing emissions. In order to meet increasingly stringent emission standards, it is necessary to increase the NO of SCR devices X The conversion rate of urea can reduce the emission of pollutants, and the fully decomposed NH 3 Fully and unifo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/28F01N3/20
CPCF01N3/2066F01N3/2892F01N2240/20F01N2610/02F01N2610/1453F01N2610/1486Y02T10/12
Inventor 薛红娟田入园李江飞牛雨飞朱海艳史运帅
Owner 无锡亿利环保科技有限公司
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