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SCR urea injection protective system

A technology of urea injection and protection system, which is applied in exhaust gas treatment, mechanical equipment, engine components, etc., can solve the problem of low working efficiency of SCR system, avoid urea crystals from blocking nozzles, slow down the reduction of exhaust gas temperature, and improve work efficiency. The effect of efficiency

Active Publication Date: 2018-04-17
DONGFENG COMML VEHICLE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem of low working efficiency of the SCR system in the prior art, and provide a SCR urea injection protection system that can effectively improve the working efficiency of the SCR system

Method used

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  • SCR urea injection protective system
  • SCR urea injection protective system
  • SCR urea injection protective system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] see Figure 1 to Figure 4 , an SCR urea injection protection system, comprising an exhaust pipe 1, a urea nozzle assembly 2 whose urea injection end is inserted into the exhaust pipe 1, the exhaust pipe 1 is provided with an annular air cavity 11 along its inner wall, the One side of the annular air cavity 11 is communicated with the outside of the exhaust pipe 1 through the intake passage 12 , and the other side of the annular air cavity 11 is evenly provided with a plurality of No. 1 air nozzle holes 111 that communicate with the inside of the exhaust pipe 1 . The air injection holes 111 are disposed toward the exhaust gas outlet 13 of the exhaust pipe 1 . The urea injection nozzle assembly 2 includes a urea injection pipe 21 and an air cooling pipe 22 coaxially sleeved outside the urea injection pipe 21 . The urea injection pipe 21 It is a straight pipe structure, the angle formed by it and the pipe wall of the exhaust pipe 1 is 135°, the liquid inlet end of the urea...

Embodiment 2

[0047] see Figure 5 , the structure is the same as that of Example 1, the difference is:

[0048] The urea injection pipe 21 is an L-shaped elbow structure, including a vertical pipe 213 and a horizontal pipe 214. The angle formed by the vertical pipe 213 and the wall of the exhaust pipe 1 is 90°. The spray end of 214 extends into the area enclosed by the annular air cavity 11 .

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Abstract

An SCR urea injection protective system comprises an exhaust pipe and a urea nozzle assembly of which the urea injection end is inserted into the exhaust pipe; the exhaust pipe is provided with an annular air cavity along the inner wall of the exhaust pipe; one side of the annular air cavity communicates with the outside of the exhaust pipe through an air inlet channel, and the other side of the annular air cavity is provided with a plurality of first air injection holes communicating with the interior of the exhaust pipe; and the urea nozzle assembly comprises a urea injection pipe and an aircooling pipe which coaxially sleeves the urea injection pipe, an air channel is formed between the interior of the air cooling pipe and the exterior of the urea injection pipe, and the air inlet endand the air outlet end of the air cooling pipe communicate with the interior of an air connector and the interior of the exhaust pipe correspondingly. Through the design, waste gas heat preservation is achieved, meanwhile, the working efficiency of an SCR system is improved, and a urea nozzle can be cooled.

Description

technical field [0001] The invention belongs to the technical field of automotive SCR post-treatment, and in particular relates to an SCR urea injection protection system, which is suitable for engines with an SCR post-treatment system above the National 5th grade, and can effectively improve the use efficiency of the SCR post-treatment system while achieving heat preservation of exhaust gas. Background technique [0002] SCR after-treatment system has been widely used as a means of NOx emission treatment. It is mainly composed of catalyst, urea tank, dosing unit, nozzle, sensor, compressed air tank, and air filter. Among them, the urea tank is used for the storage and supply of urea solution, the compressed air tank is used to provide compressed air to the dosing unit, the nozzle is installed in the exhaust pipe in front of the catalyst, and is connected to the dosing unit through the injection pipe. The main function is to spray the atomized urea solution into the exhaust ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N3/30F01N13/08
CPCF01N3/2066F01N3/30F01N13/082F01N2610/02F01N2610/1453F01N2610/1486Y02T10/12
Inventor 潘亮贾李水吴娟娟张覃亚
Owner DONGFENG COMML VEHICLE CO LTD
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