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A scr post-treatment system for preventing urea crystallization

A urea, crystallization technology, used in exhaust gas treatment, machine/engine, mechanical equipment, etc.

Active Publication Date: 2020-10-27
ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a SCR post-treatment system that prevents urea crystallization to solve the technical problem of urea crystallization on the inner wall surface of the exhaust pipe and the surface of the mixer in the prior art

Method used

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  • A scr post-treatment system for preventing urea crystallization
  • A scr post-treatment system for preventing urea crystallization

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Embodiment Construction

[0020] The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0021] Such as figure 1 and figure 2 As shown, the embodiment of the present invention provides an SCR post-treatment system for preventing urea crystallization, including a urea injector 2, a mixer 3 and an SCR catalytic converter 4 sequentially arranged along the exhaust pipe 1, wherein: the mixing A temperature sensor (not shown) and a set of blades are arranged in the device 3, and a heat sink 8 is provided on the side of the set of blades away from the impact direction of the airflow; the temperature sensor is used to detect the temperature of the set of blades, and the temperature The signal is transmitted to the ECU; the heat sink 8 is used to receive the instruction signal transmitted by the ECU, and make the temperature of the blade group not lower than the set value.

[0022] The...

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PUM

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Abstract

The invention discloses a selective catalytic reduction (SCR) aftertreatment system capable of preventing urea crystallization. The SCR aftertreatment system comprises a urea ejector, a mixer and an SCR catalysis device which are sequentially arranged along an exhaust pipeline, wherein a temperature sensor and a blade set are arranged in the mixer, and cooling fins are arranged on the face, deviating from the airflow impact direction, of the blade set; the temperature sensor is used for detecting the temperature of the blade set and transmitting a temperature signal to an electric control unit(ECU); and the cooling fins are used for receiving an instruction signal transmitted by the ECU and enabling the temperature of the blade set to be not lower than the set value. According to the SCRaftertreatment system, compared with the prior art, the cooling fins are arranged on the blade set of the mixer, thus the temperature of the blade set is increased, crystallization of urea on the mixer is prevented, the risk of that the exhaust pipeline and the catalysis device are blocked by crystals is completely eradicated, the pressure loss of the mixer is small, and the influence on the exhaust back pressure is small.

Description

technical field [0001] The invention relates to an SCR aftertreatment system, in particular to an SCR aftertreatment system for preventing urea crystallization. Background technique [0002] The emission of diesel vehicles is characterized by PM and NOX emissions that are much higher than those of other fuel vehicles, so reducing PM and NOX of diesel vehicles is the focus of emission control, and diesel vehicle emission regulations are increasingly strict on these two pollutants . Measures to reduce NOX can be roughly divided into three categories: suppression of maximum combustion temperature, improvement of fuel characteristics and aftertreatment. Post-treatment technologies mainly include selective catalytic reduction (SCR) and adsorption catalytic reduction (LNT). Among them, the common reducing agent of SCR is urea aqueous solution. [0003] The principle of catalytic reduction (USCR) technology using urea as a reducing agent is: urea aqueous solution is sprayed into...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20F01N3/28F01N13/08
CPCF01N3/2006F01N3/2066F01N3/208F01N3/2892F01N13/08F01N2470/00F01N2560/06F01N2610/02F01N2610/1453Y02T10/12
Inventor 赵真真王军张超姚炜王宏大雷蕾王次安王强周波孙影卓丽颖刘吉林倪成鑫
Owner ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD