Comparison of the Gas Compound Generation of Tarim Coal and Its Maceralsin Open System Non-Isothermal Pyrolysis with Ultra-high Temperature
Received date: 2008-09-11
Revised date: 2008-11-10
Online published: 2008-12-10
Open system nonisothermal pyrolysis at a heating rate of 1K/min, in which Tmax was 1200℃, was performed on immature coal (RO=0.4%) from the Tarim basin, and isolated macerals (vitrinite, exinite, fusinite and semifusinite), and the gas generation rate and cumulative gas production of the coal and its macerals were gotten. The gas compounds (i.e. CH4, N2, CO, etc) from the Tarim coal and its macerals in the pyrolysis were contrastively described, where the temperature of N2 generation was higher than that of CH4 and CO, and the temperature of H2 formation was consistent with the CH4, suggesting hydrogen would be an indispensable agent for hydrocarbon gases. The sequence of hydrocarbon generation potential from coal and its macerals occurs as follows: exinite>vitrinite>coal>semifusinite≥fusinite. This result indicates the hydrocarbon generation potential of coal would be controlled by its macerals. Although the exinite content in coal is the lowest than other macerals it had the greatest potential of hydrocarbon generation. The distinct two peak generation of nitrogen from coal indicated two potential sources, the former from inorganic matter, such as ammonium clays, and the latter mainly from organic matter. N2 generation from the macerals occurs at the high temperatures due to the partial loss of inorganic matter during the maceral isolation.
LIU Quan-you ;Bernhard M Krooss ;JIN Zhi-jun ;WANG Yi ; Jan Hollenstein; Ralf Littke ; LIU Wen-hui . Comparison of the Gas Compound Generation of Tarim Coal and Its Maceralsin Open System Non-Isothermal Pyrolysis with Ultra-high Temperature[J]. Natural Gas Geoscience, 2008 , 19(06) : 748 -753 . DOI: 10.11764/j.issn.1672-1926.2008.06.748
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