Solid Deposition on Inconel 600 from Thermal Decomposition of Jet Fuel: Role of Constituent Sulfur Compounds?

摘要

Carbon deposition from heated jet fuel on metal suraces is an important problem for the design of advanced aircraft (1,2). The role of sulfur compounds in carbon deposition from thermally stressed hydrocarbons is not clear. For example, Velenyi (3) found that the addition of H_2S in the steam-less ethane pyrolysis enhanced the coke deposition on an Inconel 600 tube. Reyniers and Froment (4) also found that sulfur compounds promoted coke formation in thermal cracking of hydrocarbons. These authors studied various sulfur compounds as additives and found that the carbon deposition rate decreased in the order dimethyl disulfide > carbon disulfide > benzothiophene > thiophene. On the other hand, Ohla and Grabke (5) reported that sulfur retarded graphitic carbon formation on iron, but the growth graphitic carbon on nickel was accelerated by sulfur. Trimm and Turner (6) observed both the facilitation and retardation effect of sulfur on carbon deposition from a mixture of propane and hydrogen on pre-sulfided nickel, copper ,iron and stainless steel surfaces. They suggested that the formation of stable metal sulfides on surfaces inhibited the carbon deposition, whereas the formation, and subsequent decomposition of labile metal sulfides accelerated the deposition.