Many Baotou beiben heavy truck parts novice truck drivers now sometimes asked: do not add water or urea? SCR technology can cheat cheat vehicle OBD monitoring? Even some manufacturers can boast water added directly substituted urea solution used in the urea tank from the vehicle, so as to reduce the Baotou beiben heavy truck accessories and vehicle costs the user cost, as a selling point of the vehicle.

Urea solution is colorless, transparent, clear liquid, concentration between 31.8%-33.2%, used to reduce nitrogen oxides, known as vehicle urea solution or vehicle denitration agent".

The currently used urea solution for automobiles is usually composed of 32.5% pure urea and 67.5% deionized water. The deionized water needs to be filtered and purified dozens of times on the basis of ordinary tap water to ensure the purity of the water. The concentration of urea directly influences the reduction rate of nitrogen oxides and the crystallization point of urea solution. Too high or too low concentration not only can not improve the conversion efficiency of nitrogen oxides, but will cause the residual of ammonia to form the two pollution. The concentration of 32.5% is due to the lowest concentration of urea solution at the crystallization point (freezing point -11).

Filling needs anti impurity

Baotou North rush truck fittings filling urea solution to avoid impurities into, need to use special tube, if impurities into the tank, will lead to urea box urea pump clogging. In order to prevent impurities, clean water must be used for cleaning SCR and tap water is not available. Urea is alkaline, corrosion of copper, cast iron, solder, cast aluminum is very big. At present, the country four model has used urea filter, filter out the impurities in urea solution, protect the SCR post-processing system. Storage should be avoided light and dustproof, open as soon as possible after use.

Substitution of fertilizer and urea will cause damage to parts

Common urea fertilizer contains two urea, mechanical impurities, formaldehyde and metal ions, which will cause poisoning of catalyst and parts of SCR tail gas processor. The value of urea pump is close to ten thousand yuan. If the damage can not be recovered, it will be a great loss to the users. In addition, the low conversion rate of nitrogen oxides can be caused by the low crystallization temperature of urea fertilizer and the concentration of urea solution. Ammonia loss will destroy the SCR system, so that the vehicle can not meet the emission standards.

Water instead of urea pollution, must not do this

National four cheating is a common practice is to bypass the OBD monitoring, water instead of urea solution to ensure the normal operation of the engine. Because the engine combustion of the four SCR route is sufficient, the content of NOx is higher. You know, nitrogen oxides and water in the air with nitrate conversion is a major cause of acid rain, while nitrogen oxides and other pollutants in the photochemical smog producing ultraviolet radiation pollution. The harm to the atmosphere is very large, and then has a great impact on human health. Therefore, the behavior of adding water instead of urea should be denied and resisted.