Effect of Lubricant Additives on the Oxidation Characteristics of Diesel Engine Particulate Matter

Abstract

Three common lubricant additives, including an antioxidant, detergent, and an antifoamer, were added to diesel fuel to perform a diesel engine bench test. Particulate matter samples underwent thermogravimetric analysis to investigate the effect of lubricant additives on the particulate matter oxidation process, characteristic temperature, and activation energy. The results showed the following. Different lubricant additives result in different variation trends in the thermogravimetric curve of a particulate matter sample by varying the rotating speed and torque. When the rotating speed was stable, as the torque increased, the ignition temperature of the particulate matter of Fuel C declined rapidly during the initial stage and then increased rapidly. When the torque was stable, as the rotating speed increased, the ignition temperature of the particulate matter of Fuel C increased initially and then declined. The particulate matter of Fuel C had the lowest level of activation energy at approximately 57.89 J·mol−1. The particulate matter of Fuel A had the highest level of activation energy at approximately 74.10 J·mol−1. When the fuel has a higher cetane number, the combustion chemical reaction rate is faster and results in a more complete reaction. The active substance contact surface increases, which facilitates particulate matter oxidation.

Sludge Formation Analysis in Hydraulic Oil of Load Haul Dumper 811MK V Machine Running at Elevated Temperatures for Bioenergy Applications

“…e trend of decreasing log dynamic viscosity with respect to the log shear rate of the proposed oil having characteristics of non-Newtonian pseudoplastic fluid and correlation coefficient of the mathematical model is also close to unity. Xu et al [22] studied the influence of lubricating oil additives on the oxidation of particulate matter of diesel oil with thermogravimetric analysis and found that fuel of high cetane number reacts faster. Yao et al [23] evaluated that the high temperature is the prime reason for aero lubricating oil degradation.…”