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Dynamic mixer for urea-SCR (Selective Catalytic Reduction) system of diesel engine

A dynamic mixer, diesel engine technology, applied in machine/engine, mechanical equipment, engine components, etc., can solve problems such as increased engine exhaust back pressure and reduced fuel economy

Inactive Publication Date: 2021-07-13
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of the mixer will also increase the engine exhaust back pressure, reducing fuel economy

Method used

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  • Dynamic mixer for urea-SCR (Selective Catalytic Reduction) system of diesel engine
  • Dynamic mixer for urea-SCR (Selective Catalytic Reduction) system of diesel engine
  • Dynamic mixer for urea-SCR (Selective Catalytic Reduction) system of diesel engine

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Embodiment Construction

[0019] The object of the present invention is to reduce the generation of deposits in the urea-SCR system by providing a dynamic mixer for the diesel engine urea-SCR system, improve the catalyst inlet velocity and NH 3 Concentration uniformity, while ensuring that its impact on engine exhaust back pressure is small.

[0020] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] figure 1 As shown, the dynamic mixer used in the diesel engine urea-SCR system provided by this embodiment includes a swirl tube 1 , an annular baffle 2 , a porous conical tube 3 , and an impeller 4 . Connect according to the sequence of swirl tube 1, annular baffle plate 2, porous cone tube 3, and impeller 4. The side wall of the swirl tube 1 is evenly arranged with the swirl sheets 1-1 along the axial direction, such as figure 2 shown. Evenly arrange baffle plate through holes 2-1 on the annular baf...

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Abstract

The invention relates to a dynamic mixer for a urea-SCR (Selective Catalytic Reduction) system of a diesel engine. The dynamic mixer comprises a rotational flow pipe, an annular baffle, a porous taper pipe and an impeller, wherein the rotational flow pipe, the annular baffle, the porous taper pipe and the impeller are connected in sequence; axially-distributed rotational flow pieces are uniformly arranged on the side wall of the rotational flow pipe; baffle holes are uniformly formed in the annular baffle; taper pipe holes are formed in the wall of the porous taper pipe; impeller blades are uniformly distributed in the radial direction; and the impeller rotates under the action of airflow. the dynamic mixer provided by the invention can effectively reduce the generation of sediments in the urea-SCR system and improve the inlet speed of a catalytic reactor and the concentration uniformity of NH3, so that the conversion efficiency of the catalytic reactor is improved, and meanwhile the influence of the dynamic mixer on the exhaust back pressure of an engine is relatively small; and the mixer is simple in structure, relatively low in manufacturing cost and convenient to install.

Description

technical field [0001] The invention relates to a dynamic mixer of urea-SCR system, which belongs to diesel engine NO X Emissions in the field of exhaust aftertreatment. Background technique [0002] At present, Selective Catalytic Reduction (SCR) technology is considered to reduce diesel engine NO X One of the most efficient methods of emissions. [0003] However, there are still some unresolved problems in SCR technology. For example, urea spray droplets are easy to form a liquid film on the wall of the exhaust pipe, resulting in urea crystallization, biuret, cyanuric acid and cyanuric acid monoamide and other deposits, resulting in urea Incomplete decomposition, NH 3 Unable to reach expected value, uneven distribution, NO X Lower conversion rates. It may even cause serious consequences such as exhaust pipe blockage, increased exhaust back pressure, and engine failure. [0004] SCR catalyst versus inlet velocity and NH 3 Concentration uniformity requirements are hig...

Claims

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Application Information

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IPC IPC(8): F01N3/28
CPCF01N3/2892F01N2570/14
Inventor 黄豪中陈雅娟陈英杰郭晓宇
Owner GUANGXI UNIV
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