Diesel generators in the normal working temperature, the exhaust smoke color should be colorless or light gray, the so-called colorless is not completely colorless, not as colorless as gasoline engines, but in colorless with light gray, this is the normal exhaust smoke color. Diesel engine in the work, will often appear smoke phenomenon, diesel exhaust smoke black smoke, blue smoke, white smoke and gray four, they are one of the conditions to determine the failure of the diesel engine.
The oil supply is too high to increase the amount of oil in the cylinder, resulting in more oil and less gas and incomplete fuel combustion. In addition, the heavy workload, poor quality of the fuel, low working temperature can also cause the exhaust smoke and diesel fuel in high temperature cracking reaction is inevitable, especially in the space of mixed combustion of diesel engine, due to the high temperature gas surrounded by liquid droplets, causing conditions favour cracking reaction, so at the beginning of the combustion produces a large amount of carbon, This has been confirmed by high-speed photography of the combustion process. Diesel engine in normal combustion, before the exhaust door opened, the formation of a large number of carbon particles in the early combustion can be basically burned out, the exhaust is basically smokeless. But in some adverse conditions, carbon particles can not be burned in time but reunion adsorption, in the cylinder and exhaust process to form a larger soot particles or flocs, so that the exhaust black smoke. Black smoke is incomplete combustion products, is the hydrocarbon combustion under the condition of high temperature hypoxia cracking process release and polymerization.
Exhaust light gray smoke, diesel engine work is normal, but the smoke color is gray or close to black is not normal, in addition to the above smoke black reasons, there may also be poor intake that is, the air supply is not good reasons. When the intake air filter is removed, the exhaust smoke color from deep to light or even into colorless, is the air filter is blocked, should check the cause of poor intake.
Post time: May-29-2021