Generator manufacturers remind you that the main factors affecting the aging of diesel generator oil include the following aspects:
1) Oil temperature. At normal engine oil temperature, the oxidation rate of engine oil is not significant. When the upper limit of normal engine oil temperature is exceeded, the oxidation and deterioration of engine oil accelerates with the increase of temperature. For every 10 ℃ increase in temperature, the oxidation rate of engine oil increases by about twice.
2) Diesel dilutes engine oil. Unburned diesel enters the engine oil and is actively regenerated by diesel particulate filters (DPF) through remote injection into the cylinder, causing a decrease in oil degree, flash point, and oil pressure, and damaging the oil film between various friction pairs.
3) Moisture. Oil mixed with water causes oil emulsification, leading to the failure of additives (antioxidants, cleaning dispersants, etc.) in the oil and accelerating the oxidation rate of the oil.
4) Metal debris. Metal debris has a catalytic effect on the aging of engine oil, with copper having the greatest impact, while iron's catalytic effect is 20% that of copper, and the catalytic effect of other metals is not significant.
5) Combustion products inside the cylinder of a diesel generator. The combustion products of diesel generators can be divided into direct products and indirect products. The combustible mixtures and exhaust gases generated during the combustion process of diesel generators, including various oxides, hydrocarbons, and soot, enter the crankcase through the gaps between the piston, piston ring, and cylinder wall. This gas contains fuel vapor, water vapor, carbon dioxide, nitrogen oxides, sulfides, and other types of oxides. After periodic condensation of fuel vapor, it dilutes the engine oil, causing a deterioration in its performance. Water vapor condensation easily causes oil emulsification and produces foam, which affects the lubricating performance of oil and accelerates the wear of friction pairs. Nitrogen oxides and sulfides will generate oxygen-containing acids when they come into contact with water vapor and air in the crankcase, which can corrode engine components. High temperature mixtures and exhaust gases can also cause an increase in crankcase pressure, resulting in a decrease in the lubrication performance of the engine oil.
