Comparative Study of the Effect of Fuel Deoxygenation and Polar Species Removal on Jet Fuel Surface Deposition

Abstract

The effect of near-complete deoxygenation and polar species removal on deposition 3 propensity of a Jet A-1 fuel type, with marginal thermal oxidative stability was studied 4 in a laboratory scale approach. The fuel deoxygenation was carried out via nitrogen 5 purging and two types of bespoke zeolites were used separately in a packed bed reactor 6 for partial polar separation. The treated fuel samples were assessed individually for 7 deposition propensity, using "High Reynolds Thermal Stability(HiReTS)" test device. 8 It was found that when the concentration of hydroperoxides in fuel is relatively high, 9 polar removal is more effective way than the fuel deoxygenation in reducing carbona-10 ceous deposits.

Effect of Reactive Sulfur Removal by Activated Carbon on Aviation Fuel Thermal Stability

“…. 11 Our quantum chemistry calculations suggested that the probability of this class of reaction, during the autoxidation, is higher than that of the thermal decomposition reaction. The self-reaction of hydro- peroxides is also suggested by Bateman et al 12 for the liquid phase autoxidation of hydrocarbons.…”

“…It is interesting to note that the maximum uptake of the oxygenated species was approximately the same as in the case of the adsorption in the packed bed of zeolite, as shown in our previous work. 11 However, the rate of adsorption of this class of species was slower in the combined packed bed.…”

“…Baseline Fuels and Chemical Composition. In a similar way as in our previous work, 11 three types of baseline fuels were used in the work presented here for the comparative analysis. These include two types of Jet A-1 (one with a marginal thermal stability (sample A) and the other one with high thermal stability (sample B)) and a surrogate fuel (a polar-free solvent composed of five normal paraffins in the range of C 10 −C 14 ).…”

“…The heteroatomic species included linear C6alcohol, aldehyde, ketones, aniline, butylated hydroxytoluene (BHT), Fe-naphthenate (Fe(Nap) 2 ), and dibuthyl disulfide (DBDS). 11 This article aims to do the following:…”

Synthesis and Performance of a Series of Polyisobutylene-Substituted Succinic Acid Ester Dispersants for Reducing Thermal Oxidation Deposition of Jet Fuel

“…In advanced aircraft, the aviation fuel is not only used as a power source but also as a primary coolant in the onboard thermal management system to remove excessive heat load. − During the heat exchange process, the temperature of the jet fuel increases and when it reaches about 150 °C, the hydrocarbons in the fuel will begin to react with dissolved oxygen to produce thermal oxidation deposition. , This will cause severe problems to the aeroengine, for example, it will block the tubes, nozzles, and valves, affect the heat exchange system, and may eventually even cause flight accident. − …”