Heavy trucks, buses and other diesel vehicles to meet the country's four emission standards, in the exhaust gas treatment is to choose the appropriate SCR system, and this system must use urea solution to the exhaust nitrogen oxides processing.
Therefore, the automotive urea solution has become a necessary product for heavy trucks and buses to meet the national four emission standards. SCR is the best choice for emission reduction in China. At present, the current domestic diesel national standard gb19147-2009 requirements of sulfur content ≤350ppm, and Ecr-doc technology requirements of oil content of less than 10ppm, so in China temporarily does not have the promotion conditions. SCR is resistant to 350ppm of sulfur-containing oil and therefore has a technical basis for promotion. Thanks to the SCR technology, the fuel economy of the four-engine is better than EGR technology, small engine changes, low fuel and oil requirements, advantages in technology upgrade continuity, good durability of SCR catalyst and there is no risk of catalyst clogging.
Therefore SCR technology is the most suitable for China's national conditions of heavy diesel vehicle emission reduction technology route. Automotive urea is a concentration of 32.5% and solvent for ultra-pure water urea aqueous solution, the production of raw materials for automotive urea special raw materials and ultrapure water, the key point is the purity of raw materials. From the production process, although the automotive urea to the raw material purity requirements than the general industrial needs, but the current domestic process has been able to meet the needs of practical applications.
The production process of adblue is insufficient to construct high entry barriers.