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Mixing device and diesel engine aftertreatment device

A technology of mixing devices and mixers, which is applied in the direction of exhaust devices, noise reduction devices, mechanical equipment, etc., can solve the problems of large pressure loss, poor mixing effect, complex structure, etc., and achieve small pressure loss, convenient installation and disassembly, and uniform mixing good sex effect

Active Publication Date: 2020-07-10
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a mixing device and a diesel engine aftertreatment device to solve the problems of poor mixing effect, large noise, large pressure loss and complex structure in the prior art.

Method used

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  • Mixing device and diesel engine aftertreatment device
  • Mixing device and diesel engine aftertreatment device
  • Mixing device and diesel engine aftertreatment device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Such as figure 1 The shown diesel engine aftertreatment device includes exhaust gas intake pipe 1, DOC catalyst carrier 2, urea nozzle 3, mixing device, SCR catalyst carrier 4 and exhaust gas exhaust pipe 5 connected in sequence. At this time, the mixed material in the mixing device Contains urea, an easily crystallizable component.

[0059] Such as Figure 1-6 As shown, the mixing device includes a hollow housing 6, a baffle 7, a muffler cylinder 8 and a deflector 9 connected in sequence along the direction of material flow in the axial direction of the housing 6, the baffle 7 and the surroundings of the deflector 9 are connected to the inner wall of the housing 6, and the spoiler 7 and the deflector 9 are provided with mounting holes matching the size of the muffler cylinder 8, so that Forming an inner cavity 61 located in the muffler cylinder 8 and an outer cavity 62 formed by the baffle plate 7, the muffler cylinder 8, the deflector plate 9 and the housing 6;

[...

Embodiment 2

[0068] Compared with Embodiment 1, the mixing device of this embodiment has the difference that: no heat preservation hole 71 is provided on the baffle 7 . It has been verified that under the same test conditions, the mixing device of Example 1 can obtain a mixture with better mixing effect and fewer urea crystals.

Embodiment 3

[0070] Compared with Embodiment 1, the difference of the mixing device of this embodiment is that: the deflector plate 9 is only provided with deflector holes of one diameter. It has been verified that under the same test conditions, no matter only the first diversion hole 91 or the second diversion hole 92 is provided, the mixing device of Example 1 can obtain a mixture with better mixing effect and fewer urea crystals .

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Abstract

The invention discloses a mixing device and a diesel engine aftertreatment device. The mixing device includes a hollow shell, and also includes a baffle, a muffler and a baffle connected in sequence along the material flow direction in the axial direction of the shell, and the baffle and the baffle are The surroundings are connected with the inner wall of the housing, and the baffle and the deflector are provided with mounting holes matching the size of the muffler, thereby forming an inner cavity in the muffler and the The outer cavity formed by the baffle, the muffler cylinder, the deflector and the housing; the muffler hole is provided on the muffler cylinder to make the inner cavity and the outer cavity conduct; the deflector plate There are at least two diversion holes with different hole diameters; a mixer is arranged in the muffler cylinder. The post-treatment device of the diesel engine comprises an exhaust gas intake pipe, a DOC catalyst carrier, a urea nozzle, a mixing device, an SCR catalyst carrier and an exhaust gas exhaust pipe connected in sequence.

Description

technical field [0001] The invention relates to the technical field of mixing, in particular to a mixing device and a diesel engine post-processing device. Background technique [0002] SCR catalytic reduction technology is a key technology for reducing NOx emissions from diesel engines, especially in meeting national V and above emission regulations, SCR catalytic reduction technology has become one of the essential technical routes. At present, most of the DOC+SCR straight-type urea mixers are limited by the space position, resulting in ignoring the design of the mixer, or the design is simple and rough, resulting in poor mixing uniformity of urea and ammonia. [0003] Although some existing SCR urea mixers can play a good role in urea mixing, due to the unreasonable design structure, the pressure loss generated by the mixer is relatively large, the power performance of the engine is affected to a certain extent, and there is a risk of urea crystallization. Larger, inconv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20F01N13/18
CPCF01N3/2066F01N13/18
Inventor 胡广地马卢平郭峰
Owner SOUTHWEST JIAOTONG UNIV
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