Thermal Stability of Jet-A Fuel Blends

Abstract

The thermal stability of a high-quality hydrotreated Jet-A fuel, an average-quality straight-run Jet-A fuel, and several blends of each fuel has been studied during flow through a single-pass tubular heat exchanger at 185 °C. The goal was to obtain fundamental information concerning the thermal stability of fuel blends using dynamic isothermal methods. Autoxidation was tracked as a function of stress duration by measurements of dissolved oxygen and hydroperoxides; insoluble formation was determined by measurements of the average surface deposition rate and the total quantity of bulk insolubles collected on in-line filters. On the basis of several thermooxidative stability criteria, some of the blends were found to be less stable than either neat fuel. Furthermore, benefits of blending were not realized until the lesser-quality fuel had been diluted more than 8-fold. The implications of blending high- and lesser-quality fuels are discussed in the context of autoxidation and insoluble formation.

Extended Liquid-Phase Oxidation of Aviation Fuels

“…has been proposed for hydrocarbon initiation consistent with the observed 0.5 order in 0 2 (Benson, 1976;Carlsson and Robb, 1966). It has been shown that the concentration of ROOH does not increase significantly in POSF-2827 (Jones et al, 1996). The exact reason for this is not well understood because peroxy radicals and presumably hydroperoxides could be generated following reaction (2) or (3).…”

“…Also, both are representative of their fuel class and have been extensively studied previously in neat and blended forms (Jones et al I996a). All experiments were conducted isothermally at 185°C under conditions of laminar flow using the NIFTR single-pass heat exchanger, which has been described previously (Jones et al, 1996). The configuration consisted of a tube (0.318-cm o.d.. 0.216-cm i.d.)…”

“…Unfortunately, polar species that are good natural antioxidants have also been identified as playing key roles in surface-fouling processes (Kendall and Mills, 1986;Hazlett. 1991;Jones et al. 1996).…”

Re-addition of antioxidant to aged MEROX and hydroprocessed jet fuels

“…It is well known that blending fuels can significantly alter stability aspects of the blend [30,31].…”

The oxidative stability of synthetic fuels and fuel blends with monoaromatic blending components

“…The main stabilisation of this fuel is provided by its synthetic phenolic antioxidant. The rapid autoxidation of hydroprocessed fuels with low concentrations of natural antioxidants has been described by Jones [39].…”