The evaporation performance of diesel

As with gasoline, diesel must first vaporize and form an oil-gas mixture with air in the engine cylinder before it can burn quickly and completely, and the diesel engine can work
properly.
The evaporation rate of diesel fuel is slow, the combustion is incomplete, resulting in a decrease in power, an increase in fuel consumption, and the oil is easily diluted by the unevaporated components, resulting in increased cylinder wear; The evaporation rate of diesel fuel is too fast, and when injected into the engine, it will cause a sharp rise in the pressure in the cylinder, causing the engine to work erratically
.
Therefore, the evaporation performance of diesel fuel is required to be moderate
.
Different types of diesel engines have different
requirements for diesel evaporation performance.

The evaporation performance of diesel fuel is generally expressed
by two indicators: distillation range and flash point.
The low distillation path of diesel fuel indicates that the light component content is high, the evaporation performance is good, and the diesel engine is easy to start, but the diesel is not resistant to burning; The high distillation range of diesel fuel indicates that the recombinant content in diesel is large, the evaporation performance is poor, and the combustion is incomplete, resulting in reduced power and increased fuel consumption
.
The distillation range of light diesel is generally 200 ~ 350 °C, and the partial distillation temperature is also limited
in the vehicle diesel quality standard.

The flash point is mainly to control the evaporation performance of diesel oil not to be too strong, the flash point of diesel is low, the content of light components is high, and the evaporation loss of diesel is large
.
At the same time, the flash point is also an indicator to control the safety performance of diesel, the flash point is low, and the risk of diesel fire in storage, transportation and use is high
.
For example, the internal point of diesel fuel commonly used in vehicles in Shandong is generally not less than 55 °C
.