Abnormal smoke exhaust from diesel generators is usually manifested as abnormal color of the emitted smoke, such as black smoke, white smoke, or blue smoke. These abnormal smoke colors reflect different causes of the malfunction.
1. Reasons for emitting black smoke:
Black smoke is mainly caused by carbon particles produced by incomplete combustion of fuel. The specific reasons include:
Poor operation of fuel injectors leads to poor fuel atomization quality.
The valve seal is not tight, causing air leakage and low cylinder compression pressure.
The intake duct of the air filter is blocked and the intake volume is insufficient.
The cylinder body, cylinder liner, and piston are worn, resulting in poor sealing of the combustion chamber.
2. Reasons for emitting white smoke:
White smoke is usually caused by incomplete atomization and combustion of fuel, or the presence of moisture in the fuel. The specific reasons include:
Insufficient cylinder pressure, especially during the early stages of cold start.
The cylinder gasket is damaged, causing cooling water to seep into the cylinder.
The water content in fuel is high.
The temperature is low, and diesel cannot burn completely, forming water vapor.
3. Reasons for emitting blue smoke:
Blue smoke is mainly caused by the entry of engine oil into the combustion chamber for combustion. The specific reasons include:
Oil entering the combustion chamber is usually due to wear of the piston rings or cylinder liners.
Water is mixed in the fuel or leaked into the combustion chamber.
By observing the color of the exhaust smoke, the cause of the malfunction of the diesel generator set can be preliminarily determined, and corresponding inspection and maintenance measures can be taken to improve the efficiency of fault resolution.
