At present, you can see such an eye-catching reminder on the tank of every MAN truck currently sold in China: only diesel is allowed, and biodiesel is prohibited. Some people may think that this is a lot of tips, because now there are no examples of biodiesel in domestic gas stations. Some people may wonder why they are not allowed to use biodiesel . After consulting the relevant information, we learned that there are many reasons why this alternative to petroleum fuel is not as simple as it can be used in the commercial vehicle market. What are the specific issues? After reading the article, you may have a better understanding of biodiesel.
What is biodiesel?
Many people have heard of biodiesel more or less. So what is biodiesel ? Biodiesel, also known as biodiesel, is a kind of eco-friendly biofuel that is prepared from different chemical reactions using unprocessed or used vegetable oils and animal fats. This biofuel can be used like diesel. The most common method of preparing biodiesel is transesterification. Triglycerides, which are the main components of vegetable oils and fats, react with alcohols (typically methanol) in the presence of a catalyst to produce fatty acid esters. The physical and chemical properties of the fatty acid esters are very similar to and even better than those of diesel fuels.
There is a problem that domestic use of biodiesel is not climate
Although biodiesel can be considered as an example of waste recycling, biodiesel is not generally used directly as fuel, but is mixed with ordinary diesel. A recognized empirical value is to reconcile 20% biodiesel (B20). It should be noted that this ratio may be controversial when using biodiesel with toxic components. For example, non-food grade castor oil may contain ricin. If combustion is not complete, safety concerns may result.
Biodiesel also has some technical limitations and does not adapt to many regions. Because it is more viscous than regular diesel, it will reduce usability at low temperatures. As the meat is put into the refrigerator, the fat will condense into a white, sticky texture. The academic term is called "clouding," and the condensation temperature is called "cloud point." The cloud point of petroleum-based diesel oil is about minus 15 degrees Celsius, and 100% biodiesel B100 will begin to cloud at zero degrees Celsius, and it is easy to plug the automobile oil circuit at low temperatures. Biodiesel must be added with additives or other insulation measures during the winter. In the hot and humid environment, long-term storage of biodiesel needs to take into account the inhibition of microbial and bacterial growth.
Insufficient combustion of the truck using biodiesel or excessive exhaust
Researchers in Denmark have found that if biodiesel made from rapeseed oil is not used for more effective engine improvement, the resulting emissions are likely to be more severe than those using regular diesel. Researchers reported that they tested biodiesel made from rapeseed oil with an engine modified by several parameters. As a result, the total level of carbon dioxide and carcinogens in the tail gas after combustion was 20% higher than that of ordinary high-quality diesel.
The Danish Technical University's Jessper Schramm, who is involved in biodiesel research, pointed out that the main cause of more serious tail gas emissions is that some of the engines currently using biodiesel are "breasted" to ordinary diesel engines, even if some of their operating parameters are modified. When biodiesel made from rapeseed oil is used, insufficient combustion may still occur, resulting in poor emission indicators.
Another way to say: American truck drivers love biodiesel
Although automakers recommend not using hybrid diesel with a biodiesel ratio of more than 5%, it is claimed that this diesel will damage the engine and the fuel system. But currently, there are 450 gas stations in the United States that supply 20% of biodiesel. The price of this diesel is 3 to 10 cents cheaper than regular diesel at a gas station. In order to make biodiesel an affordable alternative energy source, the U.S. government has adopted a new federal subsidy policy to lower the price of biodiesel. Through publicity, biodiesel has been accepted by more and more Americans.
Domestic policies support the development of biodiesel
In July 2011, the Ministry of Finance and the State Administration of Taxation jointly promulgated the Notice on Clearly Applying the Exemption of Excise Tax for the Production of Pure Biodiesel from Animal and Vegetable Oils, which will formally include pure organic biodiesel from waste animal and vegetable oils such as waste oil. The scope of application of consumption tax. From a policy perspective, it is a great support for biodiesel.
It is difficult to become a long-term climate biodiesel promotion
The advantage of biodiesel is that waste oil can be recovered, wastes can be used while reducing emissions of carbon monoxide and other wastes, and transport is also safer than regular diesel. In addition, studies have found that biodiesel has high lubricating properties. Blending within 5% can improve lubrication performance. However, in a short period of time, if biodiesel is used, the engine will be retrofitted, the use cost will increase, and the cost performance will be completely inferior to that of regular diesel.
Although biodiesel has been favored by the industry as an alternative energy source, many problems currently exist are the factors that hinder its development and the long road to popularization, but it is believed that with the development of science and technology, these problems will be solved in the future. After all, petroleum fuels With limited storage, finding alternative energy sources is a matter that must be considered for human development.
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