Burning Characteristics of Fuel Droplet from Refined Lubricating Oil

The burning characteristics of heavy fuel oil (HFO) and two types of refined lubricating oil (RLO) with different filtration condition are studied using TGA-FTIR analysis and a suspended droplet system. In comparison with HFO, RLO has more volatile composition, larger oxidation rate and lower gas emissions. RLO also lower ignition temperature and burnout temperature. The oxidation activation energies of these three oils were also calculated by Flynn-Wall-Ozawa method and both refined lubricating oils have similar activation energy. HFO has a higher activation energy especially when the conversion rate exceeds 40%. The results of suspended droplet experiments show that the combustion rate and the micro-explosion performance of RLO are more intense than these of HFO. During the combustion process, all these oils follow d²-law. The magnitude of the combustion rate is RLO_B>RLO_A>HFO and the final residual amount is HFO>RLO_B>RLO_A. In general, RLB_O has the best combustion performance among these oils.