Engine exhaust aftertreatment mixing device, engine exhaust aftertreatment device comprising same and application of engine exhaust aftertreatment mixing device
A technology for exhaust post-treatment and mixing devices, which is applied in exhaust treatment, exhaust devices, engine components, etc., to achieve the effects of large heat transfer area, favorable evaporation and pyrolysis, and improved anti-crystallization ability
Inactive Publication Date: 2017-09-15
TENNECO SUZHOU EMISSION SYST
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On the other hand, in order to ensure that the perforated plate 1' has sufficient mechanical strength, the material part between the perforated holes 2' is unavoidable
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[0029] Please refer to Figure 3 to Figure 12 As shown, the present invention discloses an engine exhaust aftertreatment device 100, which is used in aftertreatment systems such as SCR to treat engine exhaust. The engine exhaust aftertreatment device 100 includes an engine exhaust aftertreatment mixing device 10, an aftertreatment carrier 30 located upstream of the engine exhaust aftertreatment mixing device 10, and an engine exhaust aftertreatment mixing device 10. Downstream Selective Catalytic Reductant (SCR) 40.
[0030] The engine exhaust aftertreatment mixing device 10 includes a housing 1, a first swirl disc 2 installed in the housing 1, installed in the housing 1 and spaced from the first swirl disc 2 The second swirl disk 3 and the installation seat 4 for installing the urea nozzle (not shown) are provided.
[0031] In the illustrated embodiment of the present invention, the housing 1 is cylindrical. A mixing chamber 20 is formed between the first swirl disk 2 and ...
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An engine exhaust aftertreatment mixing device comprises a shell, a first swirling flow disc, a second swirling flow disc and a mounting seat, wherein the first swirling flow disc and the second swirling flow disc are mounted in the shell, and the mounting seat is used for mounting a urea nozzle. A mixing cavity is formed between the first swirling flow disc and the second swirling flow disc. The engine exhaust aftertreatment mixing device further comprises a fine fiber element located in the mixing cavity, wherein the fine fiber element allows exhaust and urea liquid drops to penetrate to further improve breaking and evaporation of the urea liquid drops. Through the arrangement, the engine exhaust aftertreatment mixing device has high crystallization resistance. The invention further relates to application of the fine fiber element in the engine exhaust aftertreatment mixing device and an engine exhaust aftertreatment device comprising the engine exhaust aftertreatment mixing device.
Description
technical field [0001] The invention relates to an engine exhaust aftertreatment mixing device, the aftertreatment device and its application, and belongs to the technical field of engine exhaust aftertreatment. Background technique [0002] At present, the metal structure of the mixer is used in the industry to achieve the mixing of urea droplets and exhaust gas. Usually, structures such as perforated plates and fins are set in the mixer to allow the urea droplets to collide with the metal-structured mixer so that the urea droplets are broken into smaller droplets to facilitate evaporation and pyrolysis on the metal surface . The status quo is due to the upgrade of emission regulations, which makes the current urea injection strategy more aggressive, such as starting a larger amount of urea injection at lower temperature and smaller exhaust flow. There is a heat conservation relationship here, one is the heat required for the evaporation and pyrolysis of urea droplets, an...
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IPC IPC(8): F01N3/28F01N3/20
CPCF01N3/2066F01N3/2892F01N2610/02F01N2610/1486
Inventor 李军良王天宇
Owner TENNECO SUZHOU EMISSION SYST