Oil shale pyrolysis kinetics and variable activation energy principle
Omar S. Al-Ayed,
Adnan M. Khaleel and
Applied Energy, 2010, vol. 87, issue 4, 1269-1272
A modified first order kinetic equation with variable activation energy is employed to model the total weight loss of Ellajjun oil shale samples. Fixed bed retort with 400Â g of oil shale sample size is used in this study in 350-550Â Â°C temperature range. Variable heating rate, h, in the range 2.6-5Â Â°CÂ min-1 are tested. Activation energy was allowed to vary as a function of oil shale conversion. The value of the activation energy increased from 98 to 120Â kJÂ mol-1 while the corresponding frequency factor changed from 9.51Â xÂ 105 to 1.16Â xÂ 106. Fischer Assay analysis of the studied samples indicated 12.2Â wt.% oil content. The oil shale decomposition ranged from 3.2% to 28.0%. The obtained kinetic data are modeled using variable heating rate, pyrolysis temperature and variable activation energy principle in a nitrogen sweeping medium. Good fit to the obtained experimental data is achieved.
Keywords: Variable; activation; energy; Oil; shale; Variable; heating; rate; Pyrolysis; kinetics (search for similar items in EconPapers)
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