Close-coupled scr post-processing packaging structure for light-duty diesel vehicles

A packaging structure, diesel vehicle technology, applied in mufflers, exhaust devices, engine components, etc., can solve the problems of low NOx catalytic conversion efficiency, limited layout space, etc., to achieve compact structure, less space occupation, and improved efficiency.
CN105587386BActive Publication Date: 2018-03-23WUXI WEIFU LIDA CATALYTIC CONVERTER
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
WUXI WEIFU LIDA CATALYTIC CONVERTER
Publication Date
2018-03-23

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Abstract

The invention belongs to the technical field of automobile exhaust aftertreatment and relates to a tightly-coupled selective catalytic reduction (SCR) aftertreatment packaging structure of a light diesel vehicle. The tightly-coupled SCR aftertreatment packaging structure comprises a particulate trap and a diesel oil oxidation catalyst. The particulate trap is connected with the diesel oil oxidation catalyst through a lower clamshell-shaped shell; the upper end of the lower clamshell-shaped shell is connected with an upper clamshell-shaped shell in a tightly coupled mode to form an enclosed cavity; a flow guide plate is fixedly connected to the vertical folded surface of the lower clamshell-shaped shell and comprises a horizontal plate and a vertical plate which are connected into a whole; the vertical plate extends towards the inside of the enclosed cavity; a flow guide groove is formed in the root position of the horizontal plate; a second flow guide block is disposed at the outer end of the horizontal plate; a first flow guide block is mounted on the vertical plate; a urea spray nozzle is installed on the upper clamshell-shaped shell; and the center line of the urea spray nozzle and the second flow guide block intersect. By means of the structural design, full mixing of urea liquid drops with air flow can be facilitated, and the urea pyrolysis and hydrolysis environment temperature is guaranteed.
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Description

technical field

[0001] The invention belongs to the technical field of automobile exhaust aftertreatment, and relates to a light-duty diesel vehicle close-coupled SCR aftertreatment packaging structure. Background technique

[0002] With the increasingly stringent emission regulations for diesel vehicles, SCR (Selective Catalytic Reduction) technology not only has the property of lower requirements on oil products, but also has the advantages of high fuel economy and high NOx conversion rate, etc., and is recognized It is the mainstream technology in the field of diesel engine aftertreatment. However, in the traditional SCR catalyst, the urea nozzle is placed on the exhaust pipe through the connecting seat, which requires a large space. Difficult layout and insufficient atomization space for urea droplets lead to direct spraying of urea droplets onto the wall of the exhaust pipe. When the exhaust temperature is low, urea crystallization is likely to occur on the wall of the...

Claims

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