Determination of Kinetic Parameters in Open System Non-Isothermal Pyrolysis with Ultra-High Temperature for Coal and Its Macerals and Geological Extrapolation of Natural Gas

• 责任者：Liu Quanyou (Research Institute of Exploration and Production ; SINOPEC ; Beijing 100083 ; China) ; Bernhard MKrooss
• 刊名：Earth Science Frontiers
• 出版年：2009
• 卷期：16(1)
• 关键词：煤 ; coal ; 显微组分 ; macerals ; 煤成气 ; coal gas
• 页码：p.167-172
• 图表：5 illus., 30 refs.
• 分类号：1003
• issnNo：ISSN1005-2321
• isbnNo：CN11-3370/P

///Open system nonisothermal pyrolysis experiments at a heating rate of 1 K/min were performed on immature coal samples (Ro=0.4%) from the Tarim Basin, NW China, and on their isolated macerals (vitrinite, exinite, fusinite and semifusinite) in order to determine the kinetics of gas generation (CH₄ and N₂). Assuming that the generation rate of CH₄ and N₂ was described by 25 single firstorder reactions with a single preexponential (Ao＝1.0×10¹³ s^-1), a discrete distribution of activation energies was computed by data processing for CH₄ and N₂. Based on the kinetic parameters derived from laboratory experiments, CH₄ transformation ratios were calculated for geological heating rate of 5.3 K/Ma. Gas containing more than 80% of CH₄ was formed under these conditions at temperatures in excess of 160℃ from coal, whereas the percentage of methane generation from vitrinite and exinite was higher than that from coal.