SCR catalyzing silencer and mixing tube device thereof
A technology of catalytic muffler and mixing tube, which is applied in the direction of muffler, exhaust device, machine/engine, etc. It can solve the problem of affecting the mixing effect of urea solution and exhaust gas, the atomization effect is not ideal, and the reliability and adaptability of the treatment system are affected And other issues
Active Publication Date: 2013-10-02
WEICHAI POWER CO LTD +1
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Problems solved by technology
[0007] First, the airflow disturbance in the mixing tube 12 is small, and there is an airflow stagnation area, so the urea droplets are easy to gather and adhere to the walls of the mixing tube 12 and the air inlet cylinder 14, resulting in the formation of urea crystals in the urea solution under low temperature conditions, affecting Reliability and Adaptability of SCR After-treatment System
[0008] Second, although the mixing tube 12 is provided with a perforation 121, the atomization effect is still not ideal, which affects the mixing effect of the urea solution and the exhaust gas, thereby affecting the subsequent reduction reaction, and also causing urea crystallization
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[0050] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0051] Please refer to Figure 2-3 , figure 2 It is a schematic structural diagram of the first embodiment of the mixing tube device provided by the present invention; image 3 for having figure 2 Schematic diagram of the structure of the SCR catalytic muffler in the mixing tube device.
[0052]The SCR catalytic muffler includes an intake pipe 21 , an air intake cylinder 25 and an air outlet cylinder 26 , and the mixing pipe device is located in the inner chamber of the air intake cylinder 25 , that is, the air intake chamber. The exhaust gas of the engine exhaust pipe enters the mixing pipe device through the intake pipe 21, and then enters the air intake chamber of the entire air intake cylinder 25, and then discha...
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The invention provides an SCR catalyzing silencer and a mixing tube device of the SCR catalyzing silencer. The mixing tube device comprises an outer tube and an inner tube inserted into the outer tube. One end of the inner tube is an air inlet end which allows exhausted air inside an SCR catalyzing silencer air inlet tube to enter the inner tube. An outer through hole is formed in the outer tube. The diameters of the inner tube are gradually narrowed in the direction from the air inlet end to the other end of the inner tube. Due to the design, the flow rate of airflow is increased along with the gradual narrowing of the tube diameters, and airflow disturbance is strengthened. Pyrolysis and hydrolysis reactions are generated on urea when air is exhausted, decomposed ammonia gas is evenly distributed in the exhausted air due to strong airflow disturbance, therefore, pulverization of the urea is strengthened, the probability of undecomposed urea is reduced, and formation of urea crystals is avoided.
Description
technical field [0001] The invention relates to the technical field of exhaust aftertreatment, in particular to an SCR catalytic muffler and a mixing tube device thereof. Background technique [0002] SCR technology is one of the main aftertreatment technologies to eliminate nitrogen oxides in engine exhaust. According to the function, the SCR system mainly includes three parts: the control unit, the urea dosage unit and the catalytic reaction unit. The control unit of the SCR system is integrated with the engine control unit (ECU), which is mainly used to implement the SCR control strategy, and according to the ambient temperature, exhaust temperature, urea level, urea temperature, urea pressure, NOx concentration and other sensor signals The urea dosage unit is controlled, and the urea dosage unit injects the urea solution into the exhaust gas flow regularly and quantitatively according to the demand. [0003] The urea solution is sprayed into the exhaust pipe through th...
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Inventor 张建华苗垒张素英王奉双王意宝郑贯宇陶建忠刘伟达
Owner WEICHAI POWER CO LTD