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Urea supersonic jet ejector structure and engine SCR tail gas emission aftertreatment system

An exhaust emission, supersonic technology, applied in the direction of machine/engine, exhaust treatment, engine components, etc., can solve problems such as affecting the effect of exhaust treatment, and achieve the effect of shortening the injection stroke, reducing the output pressure, and improving the conversion efficiency.

Pending Publication Date: 2021-07-09
广西沃宾电子科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the existing engine exhaust gas treatment system, the journey of urea from mixing with gas to injection is very long, and the delayed injection is very serious, thus affecting the effect of exhaust gas treatment

Method used

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  • Urea supersonic jet ejector structure and engine SCR tail gas emission aftertreatment system
  • Urea supersonic jet ejector structure and engine SCR tail gas emission aftertreatment system
  • Urea supersonic jet ejector structure and engine SCR tail gas emission aftertreatment system

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Embodiment approach

[0065] figure 1 An embodiment of the structure of a urea supersonic jet injector of the present invention is shown, including:

[0066] Primary injection mechanism 202 for urea metering injection;

[0067] The secondary injection mechanism 203 that atomizes the metered urea;

[0068] An airtight mixing chamber 201 is constructed between the primary injection mechanism 202 and the secondary injection mechanism 203, and the mixing chamber 201 is configured to allow additional fluid to mix with the urea injected by the primary injection mechanism to form a mixed fluid that is directly sprayed by the secondary injection mechanism. out.

[0069] In order to allow fluid to flow into the mixing chamber, the mixing chamber is generally provided with a fluid inlet 207. The function of the mixing chamber is mainly to provide space for the mixing of metered urea and fluid. Therefore, under the premise of ensuring the mixing, the injection port of the primary injection mechanism It is ...

Embodiment 2

[0072] On the basis of Example 1, such as figure 1 and 3 As shown in ~9, further, in the structure of the urea supersonic jet injector, the distance between the end surface of the injection port 2021 of the primary injection mechanism 202 and the end surface of the inlet 2031 of the secondary injection mechanism 203 is -50mm~50mm , no matter how the primary spraying mechanism and the secondary spraying mechanism are arranged in space, as long as the distance between the end surface of the injection port of the primary spraying mechanism and the inlet end surface of the secondary spraying mechanism is -50mm ~ 50mm.

Embodiment 3

[0074] On the basis of Example 1, such as figure 1 and 3 As shown in ~9, in the structure of the urea supersonic jet injector, the arrangement of the primary injection mechanism and the secondary injection mechanism is: coaxial arrangement or axial parallel arrangement or axial cross arrangement or axial space intersect set up. image 3 The middle is the axial vertical cross setting; Figure 4 Set for axial cross but not perpendicular angles; Figure 5 is perpendicular to the axial space; Figure 6 is axially parallel; Figure 7 The axes are parallel but in opposite directions; Figure 8 It is set coaxially but the entrance of the secondary injection mechanism is concave, and the injection port of the primary injection mechanism is inserted into it; Figure 9 The middle injection port sinks into the entrance of the secondary injection mechanism, and the distance to the entrance of the secondary injection mechanism is a negative value. Of course, there are other arrangem...

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Abstract

The invention discloses a urea supersonic jet ejector structure and an engine SCR tail gas emission aftertreatment system. The urea supersonic jet ejector structure comprises a first-stage ejection mechanism and a second-stage ejection mechanism, wherein the first-stage ejection mechanism is used for metering injection of urea, and the second-stage ejection mechanism is used for atomizing the metered urea. A closed mixing cavity is formed between the first-stage ejection mechanism and the second-stage ejection mechanism, and the mixing cavity is arranged in the mode that fluid can be additionally introduced into the mixing cavity to be mixed with the ejected urea to form mixed fluid, and the mixed fluid can be immediately sprayed out by the second-stage ejection mechanism. The system is composed of the structure, the urea can be atomized into liquid drops with very small particle sizes at low pressure, and the output pressure of a urea pump can be reduced in application, so that the system cost is reduced, and the system reliability is improved. Meanwhile, the urea gasification stroke is shortened, crystallization of the urea on an exhaust pipe is reduced, unreacted urea emission of the system is also reduced, the conversion efficiency of a catalyst is improved, and the problem that the conversion rate of NOx oxynitride is low due to difficult urea atomization is solved.

Description

technical field [0001] The invention relates to the technical field of exhaust gas post-treatment systems, and more specifically, the invention relates to a structure of a urea supersonic jet injector and an engine SCR exhaust gas after-treatment system. Background technique [0002] The implementation of China VI puts forward higher requirements on the treatment effect of the engine exhaust treatment system. [0003] In the engine exhaust treatment system, the engine exhaust is discharged into the exhaust pipe, the urea pump provides urea solution, and the electronic control unit controls the injection mechanism to mix the metered urea and gas to form a mixed fluid based on signals such as sensors and engine conditions, and then sprays it And injected into the exhaust pipe, the urea decomposes into ammonia gas at high temperature, and the ammonia gas and the exhaust gas are fully mixed and then enter the catalytic converter to undergo a catalytic reduction reaction, and fin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N3/28
CPCF01N3/2066F01N3/28F01N2610/02F01N2610/04F01N2610/146F01N2610/1486F01N2570/14Y02T10/12
Inventor 滕煜杨仕安李涛
Owner 广西沃宾电子科技有限责任公司
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