·The back of the diesel vehicle country IV: the cost of the exhaust gas purification device is difficult to popularize

It is understood that as of the end of 2013, there were more than 13 million yellow-label vehicles in the country, accounting for about 10% of the car ownership, and the pollutants emitted accounted for about 50% of the total pollutant emissions. According to the No. 27 announcement of the Ministry of Industry and Information Technology in 2014, starting from January 1 this year, the national IV emission standards for diesel vehicles will be enforced nationwide, and commercial vehicles below the national IV emission standards will not be produced and sold.
The problem of diesel exhaust pollution has been widely criticized. Therefore, the elimination of yellow-label vehicles and old models has been designated as a “hard indicator”. At present, diesel vehicles with domestic emission levels lower than the national III emission standards are called “yellow-label vehicles”.
So what is the current promotion of the National IV diesel model? Is it facing a technical barrier?
According to a survey conducted by the "Daily Economic News" reporter, from the perspective of engine technology, upgrading the country IV or the country V has no technical problems at present, but the cost of the exhaust gas filtering device is high, which is a problem to be solved in the promotion.
The cost is high and the promotion is not satisfactory. "The national IV car with similar horsepower is about 20,000 to 30,000 yuan higher than the national III car." A technical expert in the commercial vehicle field told the "Daily Economic News" reporter that In the country III car, the national IV car is relatively high in the purchase cost, and because the national IV car needs urea in the tail gas treatment, it will increase the certain use cost. These reasons lead to the promotion of the national IV car is not satisfactory. "The upgrade of the National IV model to the National V requires two layers of exhaust gas purification equipment, which is roughly equivalent to twice the purification of the National III upgrade country IV. However, if the sulfur content in the oil is too high, the catalyst (ie, catalyst) will be poisoned. The effect of purifying exhaust emissions is greatly reduced or even invalidated." A person engaged in engine technology research told the reporter of "Daily Economic News".
A heavy truck company told reporters that from the technical route, SCR and DPF (diesel exhaust particulate filter) are exhaust gas treatment devices, and the technical route of which purification device is used depends on the structure and optimization performance of the engine body. , depends on the ratio of nitrogen oxides to particulate matter in the engine exhaust, and has an impact on engine matching and cost control. "We now have DPF products installed." A related technical staff of Dongfeng Commercial Vehicle told reporters that there are no technical obstacles for most commercial vehicle companies in China for the installation of DPF and upgrade of diesel V emission standards. DPF technology is mainly used for diesel vehicle V emission standards. At present, the mandatory emission standard in most parts of China is National IV. The DPF that meets the national V standard is more expensive and only equipped in high-end products. Some products have limited sales.
The quality of supporting oil products needs to be improved. "Daily Economic News" reporter learned that at present, China mainly uses SCR (Selective Catalytic Reduction) technology as the mainstream technology for the implementation of the National IV standard for heavy-duty diesel vehicles. However, under this technology, the oil is The quality of the product also has the same requirements.
It is understood that the sulfur content of diesel with lower quality is generally too high, which will cause certain damage to SCR. Long-term use will affect the ability of tail gas treatment, and even lead to the failure of purification function.
According to the data, the oil of the National III standard was supplied in July 2013. Among them, Sinopec started to replace the national IV and national V gasoline in advance on October 1, 2014. Among them, Shanghai, Jiangsu, the eight cities of the Yangtze River and the six cities of Guangdong began to replace the national V gasoline, and the remaining provinces (cities) started 3 months ahead of schedule. Full replacement of National IV gasoline. However, the national IV standard diesel fuel supply to the whole country is far away, and it is difficult to meet the requirements of diesel engines and exhaust gas aftertreatment devices under the new standard.
Not only that, according to media reports, the current domestic urea supply facilities are still not perfect, and some areas of many cities often do not have urea to add, urea solution filling facilities are not in place or it is not convenient to use the national IV vehicles. Have a certain impact.
According to CCTV reports, the National Standards Committee issued the fifth phase of the national standard for automotive diesel, stipulating that the sulfur content per kilogram of diesel does not exceed 10 mg, and will be enforced from January 1, 2018.
According to the Beijing Environmental Protection Bureau, new heavy-duty diesel vehicles will be fully implemented before the end of this year to implement the national fifth-stage emission standards. Vehicles that do not meet the standards are “not allowed to be sold and registered in Beijing”.
From this point of view, in the face of more stringent emission standards, it requires more stringent law enforcement, as well as a comprehensive upgrade of the technical level of commercial vehicle enterprises and the improvement of the quality of supporting oil products. The necessary conditions for environmental protection problems.

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