Estimation of Quantity of Components in Marine Fuel Oil Forming into Carbonaceous Residuum

Abstract

Components of high boiling point and asphartene in fuel are decomposed into cracked gas and carbonaceous residuum by heating. The purpose of the present is to make clear how far the quantity of products generated by thermal cracking of the fuel influences ignition delay and the making of soot. As a first step of this examination, this report investigated if the quantity of the thermal cracking components and of the carbone residue could. be estimated by thermogravimetry using a thermobalance, in regard to heating of the fuel. Samples are 4 kinds of marine diesel fuels, their distillates above 350°C and 4 kinds of marine fuel oils. Aluminagel column chromatography and IP 143/90 classified each of 12 samples in total into 4 types of hydrocarbons: saturate (Sa), aromatics (Ar), resin (Re) and asphartene (Asp) . These hydrocarbons were heated up to 500°C on the condition that the temperature continued to rise 20°C/min in the thermobalance. Gas chromatography analyzed vapor and gas which were generated from the heated components. As a result of investigating data, Ar, Re and Asp, except Sa, showed the same phenomenon: the three components above 400°C reduced their weight quickly and increased rapidly the volume of cracked gas, remained the carbonaceous residuum. These properties could be gotten from an analysis of the TG-curve obtained by thermobalance. And the weight of carbonaceous residuum at 500°C on the TG-curve were proportional to the value of conradson carbon residue test. These facts clarified that the thermobalance was very useful in estimating the quantity of the thermal cracking components and of the carbone residue which the heated fuel have.