Knowledge of engineering machinery diesel oil
When it comes to construction machinery, diesel is natural, and diesel is the root of construction machinery. Therefore, choosing the right diesel fuel is half the effort to maintain machinery and proper use.
Diesel oil is extracted from the oil distillation process, according to the different, can be divided into light and heavy diesel diesel two categories. Due to the construction machinery engine speed is higher, so the use of light diesel. Diesel color was light yellow to deep yellow, some slightly green, evaporation is not easy, some feel thick.
A requirements for use of light diesel oil.
1 the ignition of moderate diesel fuel is the ability of diesel and air to form a combustible mixture, which is usually used as a "Sixteen alkane value".
As for the sixteen cetane number, it is not what the unit, but a comparison value. It refers to the combustion performance of diesel equivalent mixture of sixteen alkyl and a- methyl naphthalene, the volume percentage of sixteen. Sixteen for alkyl alkane combustion properties and starting properties than a- methyl naphthalene is much better. The combustion performance of hypothesis sixteen alkyl is 100 units, a- methyl naphthalene is 0 units. The combustion performance of two different substances, according to the different volume ratio of synthesis of mixed solution, you can get sixteen octane from 0 to 100 for a variety of standard diesel. For example, 0 Light Diesel Cetane Number sixteen should not be less than 50. Said mixture combustion performance it is equivalent to 50% 50%a- and sixteen alkyl methylnaphthalene. Sixteen alkane value is greater, the combustion performance is also better. Light diesel engineering machinery diesel engine, sixteen octane in 45 - 60. Sixteen octane number is too low, will cause the engine crude, winter It is difficult to start the season. The sixteen alkane value is too high, and the diesel injected into the combustion chamber is not enough to mix with the air. It has been on fire, resulting in incomplete combustion, resulting in black smoke, power loss and fuel consumption increase.
Low temperature fluidity 2 good low-temperature fluidity of diesel, with pour point to express. The pour point refers to the diesel engine cooling diesel engine used to lose liquidity when the temperature is an important indicator of diesel fuel.
3 the purpose of a certain viscosity is to ensure that the injection pump plunger pairs are well lubricated under the premise of good spray and complete combustion.
The evaporation of 4 appropriate evaporative diesel distillation of 50%, 90%, 95% fraction temperature said it reflected diesel from liquid to gaseous performance. The lower the temperature is, the better. But the evaporation evaporation if too good, will make diesel fuel evaporation rate indoor too fast spray, can cause diesel combustion speed, the cylinder pressure rise rate is too large. But the evaporation of crude is too low, will cause difficulties to diesel fuel evaporation, mixed with air, can not form a good mixture, resulting in incomplete combustion, coke increased, black smoke exhaust and fuel consumption increase, and difficult to start.
Selection method of B light diesel oil made in China
Grades and specifications of domestic light diesel oil, divided into high grade, first grade and three grades of qualified goods, according to the pour point is divided into 10, O, -10, -20, -35, -50 and other six brands.
The main difference between the light diesel oil, a product of high quality and qualified products in quality indicators is sulfur. Considering the current conditions of China's diesel engine lubricating oil, engineering machinery diesel engine should use sulfur in light diesel oil 0.20/0~0.50/0. This is because sulfur diesel is too large, will be generated after burning three sulphur trioxide, with water to produce sulfuric acid is very corrosive, will serious corrosion of the cylinder.
In order to ensure the normal operation of diesel engine, the temperature is allowed, can try to use high pour point diesel. Its purpose is, can increase the economic benefits. Therefore, usually use diesel pour point than the local minimum temperature of 5 DEG C lower. For example the ambient temperature at 4~7 degrees above, and purchase specifications of diesel O is to ensure the normal use of the diesel engine. Similarly, -10 light diesel oil for the minimum temperature at -5 degrees above the area.
Light diesel oil of different brands, because of their performance in addition to freezing point, is basically the same. So the oil unit in the container under the condition of insufficient, can be mixed use, does not affect its quality. However, this must be to the highest point of diesel, used as a reference. Otherwise, because of not suitable for the local environment temperature of the diesel engine the machine is not working properly.
After the introduction of the above knowledge, I believe you have a certain understanding of the choice of diesel oil. We hope that the construction machinery industry will correctly select diesel fuel and maintain good machines, so that the machine can repay you with more profitable profits.
