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A TGA/DTA-MS investigation to the influence of process conditions on the pyrolysis of Jimsar oil shale

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  • Pan, Luwei
  • Dai, Fangqin
  • Li, Guangqiang
  • Liu, Shuang

Abstract

The influence of heating rate and pyrolysis temperature on the pyrolysis of Jimsar oil shale was studied. Oil shale samples were pyrolyzed in a TG analyzer (thermogravimetric analyzer) at eight different heating rates (0.5–30 °C/min) up to a temperature of 1000 °C. The decomposition mechanism of oil shale was confirmed through online MS (mass spectrometric) combined with the TGA. Compounds of about 258 atomic mass units in the products were identified and the evolution rates of the compounds were measured. Increasing the heating rate increased the lighter alkanes/heavier alkanes ratio, unsaturated hydrocarbons/respective alkane ratio and benzene/alkyl aromatics ratio. The atomic H/C ratio of derived oil (C5–C18) decreased as the heating rate was increased from 0.5 to 15 °C/min. Then the ratio increased as the heating rate was increased to 30 °C/min. Lighter hydrocarbons evolved at lower temperature and their formation rates were higher. The H/C ratio of derived oil (C5–C18) increased firstly and then decreased with the increase of pyrolysis temperature (<620 °C). The pyrolysis kinetics of oil shale was calculated using Friedman-Carroll method. The reaction order and activation energy were changed with heating rate. And the reliability of the calculated activation energies was verified through DTA (differential thermal analysis).

Suggested Citation

  • Pan, Luwei & Dai, Fangqin & Li, Guangqiang & Liu, Shuang, 2015. "A TGA/DTA-MS investigation to the influence of process conditions on the pyrolysis of Jimsar oil shale," Energy, Elsevier, vol. 86(C), pages 749-757.
    • Handle: RePEc:eee:energy:v:86:y:2015:i:c:p:749-757
    DOI: 10.1016/j.energy.2015.04.081
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    References listed on IDEAS

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    1. Al-Ayed, Omar S. & Matouq, M. & Anbar, Z. & Khaleel, Adnan M. & Abu-Nameh, Eyad, 2010. "Oil shale pyrolysis kinetics and variable activation energy principle," Applied Energy, Elsevier, vol. 87(4), pages 1269-1272, April.
    2. Williams, Paul T. & Ahmad, Nasir, 2000. "Investigation of oil-shale pyrolysis processing conditions using thermogravimetric analysis," Applied Energy, Elsevier, vol. 66(2), pages 113-133, June.
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    Cited by:

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    2. Ziad Abu El-Rub & Joanna Kujawa & Samer Al-Gharabli, 2020. "Pyrolysis Kinetic Parameters of Omari Oil Shale Using Thermogravimetric Analysis," Energies, MDPI, vol. 13(16), pages 1-13, August.
    3. Wei Guo & Zhendong Wang & Youhong Sun & Xiaoshu Lü & Yuan Wang & Sunhua Deng & Qiang Li, 2020. "Effects of Packer Locations on Downhole Electric Heater Performance: Experimental Test and Economic Analysis," Energies, MDPI, vol. 13(2), pages 1-17, January.

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