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Exhaust aftertreatment device

A technology for exhaust after-treatment and exhaust, which is applied in exhaust treatment, exhaust device, muffler device, etc., can solve problems such as engine power performance decline, ammonia leakage, blockage of exhaust pipe, etc., to avoid dead zone and increase temperature , the effect of reducing risk

Active Publication Date: 2019-01-15
TENNECO SUZHOU EMISSION SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the distribution of ammonia is not uniform, it will lead to excessive ammonia in some areas, which will easily cause ammonia leakage, and the conversion efficiency of nitrogen oxides (NOx) will be too low in other ammonia-lean areas.
Uneven distribution of ammonia over a long period of time can lead to uneven catalyst aging, which affects the overall performance of the catalyst
In addition, the uneven distribution of urea droplets will cause the temperature of the local pipe wall or mixing structure to be too low, forming crystallization, which will block the exhaust pipe in serious cases and cause the engine power performance to decline

Method used

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Embodiment Construction

[0029] Please refer to Figure 1 to Figure 11 As shown, the present invention discloses an exhaust gas after-treatment device 100 for treating exhaust gas of a diesel engine, which includes a housing 1, a mixer assembly 2 installed in the housing 1, and a The downstream post-treatment carrier 3 and the anti-urea crystallization structure 4. Please refer to Figure 11 As shown, in the illustrated embodiment of the present invention, the aftertreatment carrier 3 includes a selective catalytic reductant (SCR) 31 and an ammonia slip catalyst (ASC) 32 .

[0030] The housing 1 is provided with an exhaust gas intake passage 11 , a mounting seat 12 for installing the urea nozzle 5 and a cover plate 13 for welding the mounting seat 12 . The urea nozzle 5 is provided with a spray hole 51 at its end for spraying urea droplets into the mixer assembly 2 .

[0031] In one embodiment of the present invention, the mixer assembly 2 includes a mixing tube 21 , a bowl cover 22 located at the ...

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Abstract

Disclosed is a tail gas after-treatment device, comprising a housing (1), a mixer assembly (2) and an after-treatment carrier (3). The housing is provided with a tail gas inlet channel (11), and an installation base (12) for installing a urea nozzle (5). The urea nozzle is provided with a spray hole (51) located at a tail end of the urea nozzle. The tail gas after-treatment device is further provided with a tail gas guiding portion (41) and a blocking piece (42) at least partially surrounding the periphery of the spray hole, the tail gas guiding portion being provided with a tail gas guiding channel (411) in communication with the tail gas inlet channel. Such an arrangement increases the temperature near the spray hole, and reduces the risk of urea crystallization. Additionally, the swirling flow formed by the blocking piece can quickly bring away sprayed urea liquid drops, thereby preventing dead zones and also reducing the risk of urea crystallization.

Description

technical field [0001] The invention relates to an exhaust gas aftertreatment device, which belongs to the technical field of engine exhaust aftertreatment. Background technique [0002] Studies have shown that the uniformity of ammonia distribution in the exhaust gas after-treatment system (such as selective catalytic reduction system, SCR system) has an important impact on the overall performance and durability of the system. If the distribution of ammonia is not uniform, it will lead to excessive ammonia in local areas, which will easily cause ammonia leakage, and the conversion efficiency of nitrogen oxides (NOx) will be too low in other ammonia-lean areas. The uneven distribution of ammonia over a long period of time can lead to uneven catalyst aging, which affects the overall performance of the catalyst. In addition, the uneven distribution of urea droplets will cause the temperature of the local pipe wall or mixing structure to be too low, forming crystallization, wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20F01N3/28
CPCF01N3/2066F01N3/2892F01N2610/02F01N2610/1453F01N2610/1486
Inventor 殷雷
Owner TENNECO SUZHOU EMISSION SYST