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SCR system nozzle integrated type urea mixer

A technology of SCR system and mixer, which is applied in the direction of fluid mixer, mixer, machine/engine, etc., can solve the problems of decreased vehicle power and fuel economy, reduced purification effect of SCR system, and failure to work normally, etc., to achieve Reduce the risk of crystallization, avoid the temperature drop of the pipe wall, optimize the effect of the airflow field and temperature field

Inactive Publication Date: 2017-05-31
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As the use time increases, urea crystals accumulate together and gradually block the exhaust pipe, greatly reducing the purification effect of the SCR system, making it unable to work normally, and reducing vehicle power and fuel economy

Method used

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  • SCR system nozzle integrated type urea mixer

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Embodiment Construction

[0018] The technical solutions of the present invention will be described below in conjunction with specific embodiments. Combined with specific implementation methods, the shape and structure of each structure, their mutual positional relationship and connection relationship, their function and working principle, etc. will be further described.

[0019] figure 1 The urea mixer shown in is a double-layer pipe structure, and the inner pipe 2 of the mixer is slightly shorter than the outer pipe 1 of the mixer. On the outer tube of the mixer, there is a certain distance between the inner tube 2 of the mixer and the outer tube 1 of the mixer. 2 and the mixer outer tube 1 to flow through the gap. Since the inner tube 2 of the mixer is not in contact with the external environment and there are high-temperature airflows on both sides, the temperature drop of the tube wall due to heat exchange is avoided. The contact with the tube inside the device increases the evaporation rate of...

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Abstract

The invention discloses an SCR system nozzle integrated type urea mixer which comprises a mixer outer pipe, a mixer inner pipe, a spoiler, a spoiler rotary shaft, a spoiler balance weight, a nozzle and a mixing blade, wherein the mixer inner pipe is positioned in the mixer outer pipe; a clearance is arranged between the mixer outer pipe and the mixer inner pipe; two ends of the mixer inner pipe are fixed on the mixer outer pipe; the spoiler is positioned at an airflow inlet end of the mixer inner pipe and can rotate around the spoiler rotary shaft in the mixer inner pipe; the spoiler rotary shaft is positioned in the mixer inner pipe; the spoiler balance weight is positioned at the edge of the spoiler; the nozzle penetrates through the mixer outer pipe and the mixer inner pipe and forms a 45-degree included angle with the pipe wall of the mixer; the nozzle opening is formed in the mixer inner pipe and is positioned in the back of the spoiler; and the mixing blade is fixed on the mixer inner pipe and is positioned at the back of the nozzle. The SCR system nozzle integrated type urea mixer can increase the evaporation rate of urea solution, greatly reduces the crystallization risk of urea aqueous solution, and optimizes an airflow field and a temperature field.

Description

technical field [0001] The invention relates to a component of an exhaust device of a diesel automobile, in particular to a urea mixer in an exhaust emission system of a diesel automobile. Background technique [0002] There are currently two technologies for reducing exhaust emissions, one is the SCR (Selective Catalytic Reduction) technology that purifies particles inside the machine and catalytically reduces nitrogen oxides outside the machine, and the other is EGR that purifies nitrogen oxides inside the machine (Engine Exhaust Gas Recirculation) and off-board particulate filter technology through a particulate filter. In order to meet the increasingly stringent emission regulations of heavy-duty diesel commercial vehicles and heavy-duty diesel engines, combined with the domestic supply of diesel oil, the economy of vehicle production and operation, and the reality of vehicle emission standards, in order to reduce the nitrogen oxides of the above-mentioned diesel vehicle...

Claims

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Application Information

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IPC IPC(8): F01N3/28F01N3/20B01F5/06B01F5/02
CPCF01N3/2066F01N3/28F01N3/2892F01N2610/02B01F25/282B01F25/4231Y02T10/12
Inventor 刘军周磊卢凯王明远吴燕
Owner JIANGSU UNIV
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