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The structure and pyrolysis product distribution of lignite from different sedimentary environment

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  • Liu, Peng
  • Zhang, Dexiang
  • Wang, Lanlan
  • Zhou, Yang
  • Pan, Tieying
  • Lu, Xilan

Abstract

Low-temperature pyrolysis is an economically efficient method for lignite to obtain coal tar and improve its combustion calorific value. The research on the distribution of pyrolysis product (especially coal tar yield) plays an important role in energy application and economic development in the now and future. Pyrolysis test was carried out in a tube reactor at 873K for 15min. The structure of the lignite was measured by solid 13C nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FTIR). The thermal analysis was analyzed by thermo-gravimetric (TG) analyzer. The results show that the pyrolysis product distribution is related to the breakage of branch structures of aromatic ring in lignites from different sedimentary environment. The gas yield and composition are related to the decomposition of carbonyl group and the breakage of aliphatic carbon. The tar yield derived from lignite pyrolysis follows the order: Xianfeng lignite (XF, 13.67wt.%)>Xiaolongtan lignite (XLT, 7.97wt.%)>Inner Mongolia lignite (IM, 6.30wt.%), which is mainly influenced by the aliphatic carbon contents, the CH2/CH3 ratio and the oxygen functional groups in lignite. The pyrolysis water yield depends on the decomposition of oxygen functional groups. IM has the highest content of oxygen-linked carbon so that the pyrolysis water yield derived from IM is the highest (9.20wt.%), and is far more than that from the other two lignites.

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  • Liu, Peng & Zhang, Dexiang & Wang, Lanlan & Zhou, Yang & Pan, Tieying & Lu, Xilan, 2016. "The structure and pyrolysis product distribution of lignite from different sedimentary environment," Applied Energy, Elsevier, vol. 163(C), pages 254-262.
    • Handle: RePEc:eee:appene:v:163:y:2016:i:c:p:254-262
    DOI: 10.1016/j.apenergy.2015.10.166
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