Combustion characteristics of lignite and oil shale samples by thermal analysis techniques

M. V. Kok, G. Pokol, C. Keskin, J. Madarász, S. Bagci

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73 Citations (Scopus)

Abstract

In this research thermal analysis and kinetics of ten lignite's and two oil shale samples of different origin were performed using a TA 2960 thermal analysis system with thermogravimetry (TG/DTG) and differential al analysis (DTA) modules. Experiments were performed with a sample size of ∼10 mg, heating rate of 10°C min-1. Flow rate was kept constant (10 L h-1) in the temperature range of 20-900°C. Mainly three different reaction regions were observed in most of the samples studied. The first region was due to the evaporation of moisture in the sample. The second region was due to the release of volatile matter and burning of carbon and called as primary reaction region. Third region was due to the decomposition of mineral matter in samples studied. In kinetic calculations, oxidation of lignite and oil shale is described by first-order kinetics. Depending on the characteristics of the samples, the activation energy values are varied and the results are discussed.

Original languageEnglish
Pages (from-to)247-254
Number of pages8
JournalJournal of Thermal Analysis and Calorimetry
Volume76
Issue number1
DOIs
Publication statusPublished - Aug 16 2004

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Keywords

  • Activation energy
  • Coal
  • Kinetics
  • Lignite
  • Oil shale
  • Thermal analysis

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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