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Proper use of vehicle urea

Common chemical urea because it contains biuret, mechanical impurities, formaldehyde, metal ions will cause SCR exhaust post-processor catalyst poisoning, resulting in damaged parts. And we search through the network and found that the value of urea pump small 10,000 yuan, if the occurrence can not restore damage, the user is not a small loss.
In addition, because the fertilizer low temperature easy crystallization and can not guarantee the concentration of urea solution, will cause low conversion of nitrogen oxides. In addition, the loss of ammonia will destroy the SCR system, so that vehicles can not meet the emission standards. One of the common practices of cheating in the country is to bypass the OBD monitoring and replace the urea solution with water to ensure that the engine is working properly. Because the country four SCR line of the engine combustion is full, the emission of NOx content is relatively high.
NOx and air in the water associated with the conversion of nitric acid is a major cause of acid rain. At the same time, NOx will produce photochemical smog pollution with other pollutants under ultraviolet light. The atmosphere is very large harm, and then on human health also have a great impact. Therefore, the behavior of adding water to replace urea should be denied and resisted.
Car urea selection, automotive urea solution known in the country a lot, in accordance with the European name for the "Adblue" solution, and in North America is also known as DEF diesel discharge treatment fluid, the domestic also known as diesel engine nitrogen oxides reductant, Vehicle denitrifying agent.
Most diesel vehicle manufacturers tend to use a urea aqueous solution (AUS32) at a concentration of 32.5% as a reducing agent. The concentration of urea directly affects the reduction rate of nitrogen oxides and the crystallization point of the urea solution. Too high or too low concentration can not only improve the efficiency of nitrogen oxide conversion, but will cause the formation of secondary pollution of ammonia. The choice of 32.5% concentration, because the vehicle urea solution at this point the lowest crystallization point (freezing point -11 ℃).
Urea solution in the filling process need to try to avoid impurities into the solution and urea tank. General urea solution in the filling when there is a dedicated tube, as long as the opening of urea cans, plug the tube just fine. But there are some people usually do not pay attention to the impurities into the tank, blocking urea tank urea pump. In order to prevent impurities, cleaning SCR must use pure water, not available tap water.
Proper use of automotive urea, urea was alkaline, copper, cast iron, solder, cast aluminum corrosion is great. Urea filling improperly overflows can contaminate tanks and vehicles. In addition, because the urea itself, although the eye, the skin is no major harm, but also a slight stimulation of the human body. If exposed to skin, rinse exposed skin with plenty of soapy water or water. If you contact with the eyes, then open the upper and lower eyelids, rinse with water.
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