White smoke refers to the exhaust smoke color is white, it is different from colorless, white is the white of water vapor, said the exhaust smoke contains moisture or contains unburned fuel components. White smoke from the exhaust pipe is formed due to the evaporation of oil and gas at low temperature in the cylinder of the diesel engine, especially in winter. When the diesel engine is running in severe cold weather, the temperature of the diesel engine is low and the exhaust pipe temperature is also low. It is a normal phenomenon that the steam exhaust condenses into water vapor to form white exhaust smoke. If the temperature of the diesel engine is normal and the exhaust pipe temperature is normal, the white smoke is still discharged, indicating that the diesel engine is not working normally and can be judged as a fault of the diesel engine. The main influencing factors are:
When the diesel engine is just started, there is no combustion in the individual cylinder (especially in winter), and the unburned fuel mixture is discharged with the exhaust gas of other working cylinders to form water vapor smoke.
Piston, cylinder liner and other serious wear caused by insufficient compression force, resulting in incomplete combustion.
There is water and air in fuel oil. Water and air with fuel injection into the cylinder to form an uneven fuel mixture, combustion is not complete, resulting in a large number of unburned hydrocarbon out of the machine.
The cylinder liner is cracked or the cylinder cushion is damaged, and the cooling water enters the cylinder with the increase of the temperature and pressure of the cooling water. Form easily when exhaust water mist or steam.
The fuel advance Angle is too small. Before the piston goes up to the top of the cylinder, too little fuel is injected into the cylinder to form a thinner combustible mixture. The late injection reduces the amount of premixed fuel and the amount of premixed fuel. Pre-mixture is reduced, reducing the combustion rate, the end of combustion is late, combustion forms a large number of water vapor smoke.
Post time: May-29-2021