SULFUR DEPOSIT FORMATION IN JET FUEL AT HIGH THERMAL STRESSING TEMPERATURES

摘要

Aviation fuel thermal stability is defined by its resistance to deposit formation while undergoing thermal stress. Thermal deposits have normally been characterized visually or when quantified, as a total deposit mass or specifically related to carbon mass. It has been observed that some fuels, specifically MEROX treated, tend to form high levels of sulfur containing deposits, some times of greater mass of total sulfur than carbon. This work describes sulfur deposit formation quantified by total sulfur analysis using a LECO CS-244 from jet fuels over a range of temperatures (300 - 400°C) and flow conditions (0.5 - 2 ml/minute) in a single pass thermal stability rig. It was observed that sulfur deposit mass increased with temperature and decreased with increasing flow rate. Sulfur deposition rate also decreased with total mass of fuel stressed suggesting influences from changes in deposit thermal conductivity on the reaction vessel surface.