Viscosity
The kinematic viscosity of the fuel oil indicates the viscosity of the fuel oil, which is a measure of the flow resistance capacity. Its size indicates the ease of flow, pumping and atomization of the fuel oil. At present, 40 ℃ kinematic viscosity and 100 ℃ kinematic viscosity are commonly used in China. In the past, the fuel oil industry standard used Engler viscosity as the quality control index, and used 80 ℃ kinematic viscosity to divide the brands. The kinematic viscosity of an oil product is the ratio of its dynamic viscosity to its density. When the dynamic viscosity of the body is 1 poise and the density is 1 g/cm3, the dynamic viscosity is 1 stokes. Viscosity is the main basis for classifying fuel oil grades, and also an important quality index of fuel oil.
water content
The water content of the fuel oil indicates the water content in the fuel oil. The water will reduce the calorific value of the fuel oil and rust the relevant parts of the equipment. The existence of water will affect the freezing point of fuel oil. With the increase of water content, the freezing point of fuel oil will gradually rise. For more information about oil products, please pay attention to the public number oil product circle. In addition, water will also affect the combustion performance of fuel oil machinery, which may cause furnace flameout, shutdown and other accidents.
chroma
The chroma of fuel oil, the color depth of diesel oil and the color depth of diesel oil can indirectly reflect the quality of diesel oil.
density
The density of fuel oil, the ratio of mass to volume of fuel oil, and the important basis for fuel oil measurement are also important indicators for measuring fuel oil components.
flash point
The flash point of fuel oil, the lowest flash point of volatile gas of fuel oil, and the safety index of fuel oil also reflect the content of light components in fuel oil.
Freezing point
The freezing point of the fuel oil, the minimum temperature at which the light fuel oil does not flow, the low temperature fluidity index of the fuel oil, and the main basis for the classification of diesel oil.
acidity
The acidity of fuel oil indicates the amount of acidic substances in the fuel oil. If the acidity is too high, the equipment will be corroded, and it is also an important quality indicator of light fuel oil.
Distillation range
It indicates the distribution of components in light fuel oil, the important method for determining the components of fuel oil, and the important quality index of fuel oil
Sulfur content
Sulfur content of fuel oil. The content of sulfur and its derivatives in fuel oil, environmental indicators, and high sulfur content in fuel oil will cause corrosion of metal equipment and environmental pollution. According to the sulfur content, fuel oils can be divided into high sulfur, medium sulfur and low sulfur fuel oils, which are also important quality indicators of fuel oils.
Metal element content
The content of metal elements Al, V, Si, etc. in fuel oil is limited, which is harmful to equipment.
Carbon residue
The residue of fuel oil formed after evaporation and pyrolysis, with more carbon residue in the fuel oil, indicates that the fuel oil is easy to oxidize to form colloid or carbon deposit.
Fuel putty
The residue of carbonized fuel oil is calcined to obtain too much inorganic ash, which will form scaling, aggravate the wear of equipment and affect the normal operation of equipment. In addition, ash will also cover the heating surface of the boiler, which will deteriorate the heat transfer performance.
impurity
Impurities in the fuel oil, insoluble sediment or suspended solids in the fuel oil, and mechanical impurities will block the oil filter, increase the wear of equipment, and affect combustion.
Oxidation stability
It is used to indicate the oxidation stability and oxidation resistance of distillate fuel oil. It is an important quality indicator of diesel oil and can reflect the gum formation tendency of diesel oil.
Cetane number
It is an index to measure the ignition performance of diesel fuel and the ignition performance and work ability of diesel fuel in the engine.
calorific value
The calorific value of fuel oil, the heat released when the unit weight of fuel oil is completely burned, and the level of heat energy generated by fuel oil are the main indicators for evaluating the quality of fuel oil.