Urea nozzle for anti-clogging vehicle and anti-clogging method for urea nozzle

Abstract

The invention discloses an anti-clogging vehicle urea nozzle, which comprises a urea delivery pipe, a nozzle, a mounting plate, a joint pipe and a heat insulation sleeve, the outer end of the urea delivery pipe is connected to the joint pipe and the inner end is connected to the nozzle, and the installation plate is fixedly sleeved on the urea In the middle of the delivery pipe, the joint pipe is connected to the urea supply unit; the heat insulation sleeve is sleeved on the outside of the urea delivery pipe, and one end of the heat insulation sleeve touches the installation plate and the other end touches the nozzle; the inner wall of the heat insulation sleeve is provided with grooves, A closed heat-insulation cavity is formed between the groove and the outer wall of the urea delivery pipe. The heat-insulation sleeve is also provided with an air inlet for introducing compressed cooling air into the heat-insulation chamber and an air outlet for exporting the cooling air. The air inlet passes through the pipe Connect to vehicle compressed cooling air supply unit. The urea nozzle for an anti-clogging vehicle and the anti-clogging method for the urea nozzle of the present invention perform air cooling on the part where the urea nozzle enters an exhaust pipe, lowers its working temperature, and prevents the nozzle from being blocked by urea crystallization.

Description

technical field [0001] The invention relates to the technical field of vehicle accessories, in particular to an anti-clogging vehicle urea nozzle and an anti-clogging method for the urea nozzle. Background technique [0002] With the deterioration of the atmospheric environment, national regulations have increasingly stringent requirements on vehicle emissions. Selective catalytic reduction SCR aftertreatment system has been widely used as the main aftertreatment technology to effectively reduce nitrogen oxides in exhaust gas. Selective catalytic reduction (SCR) is currently recognized as one of the most effective post-treatment technologies for reducing NOx emissions from diesel engines. Urea SCR sprays a certain amount of urea solution into the exhaust pipe, and the urea solution evaporates. The reducing agent NH3 is obtained in the process of pyrolysis and hydrolysis, and NH3 selectively reduces NOx to N2 under the action of the catalyst, thereby reducing the content of ...

AI Technical Summary

Problems solved by technology

[0003] The urea nozzle in the existing diesel engine exhaust gas treatment SCR system tends to crystallize or generate polymer to block the nozzle hole at high temperature and low flow rate, and the part of the nozzle conveying pipe entering the exhaust pipe is placed in the high temperature environment of exhaust gas for a long time, which affects the use due to poor cooling life

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