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According to the official website of the Ministry of Industry and Information Technology, on January 1, 2015, that is, from tomorrow, China will implement the National IV emission standard for diesel vehicles, and the diesel vehicles of the National III standard (engine) will not be allowed to be sold or registered.
Solve the high emission of diesel vehicles
Speaking of heavy-duty diesel cars, many people will have such a picture in their minds: The engine emits a huge noise and the car's buttocks emits thick black smoke. People will wrinkle whenever the diesel car passes by. Raise your brow and cover your mouth and nose as far as possible. Although such scenarios are not common in metropolitan areas, exhaust emissions from diesel vehicles have always been a big problem. It is understood that in recent years, China has significantly improved vehicle exhaust emissions through a series of oil upgrades and vehicle exhaust gas treatment, but diesel vehicle exhaust emissions have not been fundamentally resolved.
According to the “2013 Annual Report of China’s Motor Vehicle Pollution Prevention and Control†issued by the Ministry of Environmental Protection earlier this year, the number of motor vehicles in China increased by 7.8% in 2012. Among them, only 10.1% of vehicles that meet the national IV and above standards are in China. Accounting for 51.5%, the National II standard car accounted for 15.7%, and the National I standard car accounted for 14.9%. The remaining 7.8% of cars still do not meet the national I standards. Classified by environmental protection signs. "Green standard car" accounted for 86.6%, and high-emission "yellow car" still accounted for 13.4%. Relevant statistics show that in 2012, the number of heavy trucks in China was 4.725 million, which accounted for 2.11% of the total vehicle population, but the proportion of nitrogen oxides and particulates emitted was 49.3% and 60.7% respectively. In other words, heavy-duty trucks (diesel cars) are the "culprit" of nitrogen oxides and particulate emissions from motor vehicles. According to statistics, the sales volume of heavy-duty diesel vehicles in China was 770,000 in 2013, and the number is still increasing.
According to the national "Twelfth Five-Year Plan", nitrogen oxides are listed as binding targets, requiring a reduction of emissions by 10% during the "12th Five-Year Plan" period. In order to control the exhaust emissions of diesel vehicles, the Ministry of Industry and Information Technology released an announcement in the first half of this year that it will be abolished by the end of this year for diesel vehicles that are applicable to the National III emission standards. In other words, from the New Year's Day next year, the State III standard diesel vehicles will not be sold.
SCR technology allows exhaust gas compliance
Because the environmental protection department has proposed to further reduce the emission of nitrogen oxides from diesel engines, engine manufacturers have used their post-discharge processing technology. So an SCR technology to deal with diesel emissions (SelectiveCatalyticReductionTechnology Selective Catalytic Reduction Technology) came into being. It is understood that currently the developed countries in Europe and America mainly use SCR technology, which is an oxidation catalyst technology that can solve the problem of heavy-duty diesel vehicle exhaust emissions. At present, China has installed SCR systems for all diesel vehicles of the National IV Standard.
According to reports, using tail gas treatment liquid can reduce 90% of nitrogen oxides and 80% of particulate matter in diesel vehicle exhaust. This technology is mainly used in diesel exhaust gas treatment fluid (commonly known as car urea) used in diesel engine exhaust gas after-treatment, as a reductant SCR system, thereby effectively reducing emissions of nitrogen oxides (NOx) in diesel vehicle exhaust . Then by increasing the temperature and pressure inside the cylinder, PM emissions are reduced. In the SCR system, a urea tank (loading a diesel exhaust fluid) and an SCR catalytic reaction tank are included. The operation process is as follows: When it is found that there is nitrogen oxide in the exhaust pipe, the urea tank automatically ejects the diesel exhaust gas treatment liquid, and the diesel exhaust gas treatment liquid and the nitrogen oxides undergo an oxidation-reduction reaction in the SCR catalytic reaction tank to generate no pollution. Nitrogen and water vapor are discharged.
According to experts, the SCR system will be the main technical direction for future domestic diesel engine emission upgrades. At present, major domestic diesel engine manufacturers have basically reached consensus. The main reasons for the SCR system being suitable for the Chinese market are: First, the SCR system can effectively save fuel consumption. The fuel consumption of the SCR system is slightly lower than that of the EGR (exhaust gas recirculation) + DPF (applied particle trap) system, and its consumption of urea aqueous solution can also be compensated for in fuel consumption; secondly, in the EGR+DPF system, it needs to increase. The volume of the cooler, SCR system only requires an additional storage tank, which has little effect on the design of the vehicle cab; Third, if this technology is adopted now, it can meet the requirements of emission regulations for a long time until European The introduction of V and even higher emission standards; In addition, the engine is low in complexity and wide in application, and the SCR system can meet both the National III and National IV standards.
Relevant experts remind consumers that when they choose to purchase the corresponding products, they need to choose a regular manufacturer and choose a formal channel to purchase.
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