• With the implementation of the country's three emission standards, the country's three diesel engines have been technically upgraded. At present, the diesel engine adopts high-pressure common rail and EGR technology (EGR is the abbreviation of the English Exhaust Gas Recirculation meaning exhaust gas recirculation system. It is set for nitrogen oxide NOx, one of the harmful gases in the engine exhaust. Exhaust gas purification device). At present, the domestic high-pressure common-rail engine of State III emissions is about 1-2 thousand yuan more expensive than the National III emission EGR engine. Taking the Cummins engine as an example, the price of a Cummins engine of a country III standard is approximately 15,000 to 20,000 yuan higher than the price of a national II standard; and the price of an EGR engine of a country III standard is only approximately 1 higher than the price of a national II standard. Ten thousand yuan. Due to the difference in price between high-pressure common-rail engine and EGR engine, many people in the industry pointed out that EGR engines may have an advantage in the sales market, but they also pointed out that the current domestic EGR technology is consistent in stability, reliability and environmental protection. And further technical upgrades. Relevant persons also pointed out that if the user's use is concerned, since EGR works by sending part of the exhaust gas produced by the diesel engine back to the cylinder and forming a cycle, delaying the combustion process causes the pressure forming process in the combustion chamber to slow down. The main reason for the reduction in nitrogen oxides, but easily lead to poor combustion of the engine, and poor economics in the long run. The high-pressure common-rail engine has a good economy. In the long run, it can reduce the user's operating costs. In terms of practical performance, high-pressure common-rail engines are also more advanced. And in terms of technology upgrades, it is easier to upgrade high-pressure common rail engines to China IV. Experts also pointed out that the problem with EGR is the deposition of particulate matter in the pipeline. After the EGR engine has been in operation for several hundred hours, there will be deposition of particles in the pipeline, which will reduce the effect of EGR. As well as the tightness and reliability of the EGR valve, this can also cause the deposition of particles. This is also the reason to minimize the dependence on EGR when doing new concepts. There are also some industry insiders questioned that in foreign countries, the cost of EGR engines and high pressure common rail engines is almost the same, why is there a big price difference in the country? According to investigations, the current domestic car manufacturers that use EGR technology are only China National Heavy Duty Trucks. Regarding various doubts in the market, relevant Sinotruk sources pointed out that they can only be proved one by one by the effect of EGR on the market in the future. China National Heavy Duty Truck Group also explained that if only from the material cost point of view, EGR engine and high pressure common rail engine costs are similar. The difference in price that currently appears is mainly reflected in the cost of technology research and development. Because China National Heavy Duty Truck's EGR engine technology is independently developed by China National Heavy Duty Truck, so the core technology is owned by China National Heavy Duty Truck, and the core part of the domestic high-pressure common-rail engine to be imported from abroad, so the price It will be higher. Regarding stability and reliability issues, relevant Sinotruk sources said that Sinotruk's EGR engine was in charge of the two years of experimentation by the Tianjin China Steam Weaving Research Center before it was introduced to the market. At present, there may be problems with the engine. All are just speculation, but also depends on the future use, but Sinotruck related persons also pointed out that due to the uneven quality of domestic oil products, some oil products can not meet the national III standard, it is possible to make EGR engine in use process Obstacles are encountered because the EGR engine requires less than 500 ppm of sulfur in the fuel, but China's local fuels have varying amounts of sulfur, which may impair EGR performance. In summary, high-pressure common-rail engines are technically superior to EGR engines, but are at a disadvantage in terms of price. Whether the engine uses high-pressure common rail technology or EGR technology, both will eventually reach the same goal, both to meet higher emission standards and reduce environmental pollution. Aone-Best
VAS02/05 Vortex Air Separator is used in the circulating water pipe of air
conditioning system to separate the air from the system and to discharge the
collected air through the Air Release Valve at the top of the system. Through
this function, the air in the system can be removed, the pipe resistance can be
reduced, the noise can be reduced, the service life of the system accessories
can be improved, and the conveying efficiency of the system can be improved.
The
working principle of the vertex air separator is to make the water flowing into
the separator rotate around the center through its special design structure.
Due to the influence of centrifugal force, bubbles and water are separated,
gathered at the top of the separator, accumulated to a certain amount and then
discharged by the air release valve. Therefore, the higher velocity is
beneficial to the separation effect of bubbles and water.
Vortex Separator,Vortex Air Separator,Air Separator Valve,Air Oil Separator Filter A1BEST International Corporation , https://www.aone-best.com
The upgrade from the Euro II emission standard to the Euro III emission standard is actually an upgrade of the engine. Currently, in many countries, the National IV emission standards are used in many places. The main technologies are high pressure common rail and EGR, as follows:
August 04, 2021