Supply of high-quality car Guilin Guilin Car urea urea where good 18938164136 With the implementation of China's four diesel emissions policy, China's use of urea thousand net automotive diesel will be more and more, but thousand net vehicle after using urea a novelty, many people are still lack of knowledge, and even use some misunderstanding on this for some thousand net car works with a brief introduction and some considerations on the use of urea, and I hope to give you the use of thousand net cars provide useful lessons urea units. The main polluting emissions of diesel engines is NOx (nitrogen oxides) and PM (particulate), required to reduce emissions of these two operating conditions are exactly opposite, and therefore, there has been EGR (exhaust gas recirculation) and SCR (selection catalytic reduction) technology solutions to meet the requirements of the two countries four emissions. SCR technology route taken in the combustion engine in the process, has made the diesel combustion by technical means to achieve effective control PM emissions targets, and NOx in the exhaust process requires in its reduced to nitrogen (N2) and water (H2O), this process is reducing vehicle urea solution. When injected into the urea solution into the exhaust pipe from the exhaust turbocharger out of the exhaust pipe is mounted metering a urea injection device, the temperature reached 300 ℃ -500 ℃, in the catalyst of urea (NH2CONH2) hydrolysis NH3 and CO2, NH3 and NOx react to form nitrogen and water discharge. Vehicle urea solution in the catalytic reduction reaction is very fine control of a process, the quantity of urea injected must match the NOx concentration, the amount of injected urea is too small, then reach the level of treatment should , the amount of injected urea is too large, will cause the excess ammonia gas into the atmosphere, resulting in new pollution. Thousand net environmental protection in this large supply of high-quality car Guilin urea.