Strictly speaking, the vehicle urea solution is composed of 32.5% high purity vehicle urea and 67.5% deionized water. On the basis of ordinary water purification, dozens of times of water purification can be guaranteed. Compared with the common agricultural urea, the requirements for the control of micro metal content index of vehicle urea are much more strict. These control requirements are important factors to determine whether the quality of vehicle urea solution is qualified. Therefore, in order to reduce production costs, some "small workshop" enterprises use ordinary water instead of deionized water, and use agricultural urea instead of vehicle urea. The quality of vehicle urea solution produced in this way is quite different from that of qualified products.
The use of unqualified urea for vehicles will reduce the conversion efficiency of nitrogen oxides in light cases, and directly damage the after-treatment system of vehicles in severe cases, resulting in irreversible mechanical failure and even engine scrapping, resulting in huge losses of tens of thousands of yuan or even more than 100000 yuan. How does the quality of vehicle urea affect the vehicle and SCR system in use?
Firstly, the concentration of vehicle urea solution is one of the key factors affecting SCR system. The concentration of urea is directly related to the catalytic efficiency of nitrogen oxides and the freezing point of urea solution, and also affects the parameter setting of after treatment system. The concentration of high-quality urea solution for vehicles must be within the specified range, which is difficult for inferior products to achieve.
Secondly, the quality of vehicle urea also has adverse effects on spray attachment and catalyst of SCR system. The unqualified vehicle urea contains impurities insoluble in water, which block the filter, urea solution delivery pipeline and nozzle. The coke deposition after combustion of impurities will affect the spray attachment of the postprocessing system and block the catalyst skeleton, resulting in the reduction of catalyst efficiency and service life.
In addition, if the urea concentration does not meet the standard, the emission will exceed the standard, which is reflected in the immediate reduction of engine torque and insufficient vehicle power; in cold conditions, it will directly cause the metering pump to freeze
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