Formation and Decomposition of Aromatic Hydrocarbons from High-volatile Coals under High-temperature Pressurized Gasifier Conditions

Abstract

The formation and decomposition of aromatic hydrocarbon is important for understanding the reaction in coal gasifiers. There are few reports about the formation and decomposition of aromatic hydrocarbons from fuel in pressurized drop tube furnace (PDTF) reactor which was operated under sufficiently dilute condition to neglect the interaction between hydrocarbon and char. So we measured the hydrocarbon formation and decomposition from 4 high-volatile coals with fixed carbon over volatile matter ratio ranging from 0.94 to 1.53, using a dilute PDTF. PDTF was operated under a pressurized condition of 1.0 MPa at 1273 K and the residence time was varied from 0.5 to 1.5 s. Applying first-order reaction kinetics for decomposition of aromatic hydrocarbons, it was estimated that higher volatile coal yielded more initial formation of higher carbon number aromatic hydrocarbons.