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

KÖK M. V., Pokol G., Keskin C., Madarasz J., Bagci S.

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, cilt.76, sa.1, ss.247-254, 2004 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 76 Sayı: 1
  • Basım Tarihi: 2004
  • Doi Numarası: 10.1023/b:jtan.0000027823.17643.5b
  • Dergi Adı: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.247-254
  • Anahtar Kelimeler: activation energy, coal, kinetics, lignite, oil shale, thermal analysis, PARTICLE-SIZE, HEATING RATE, COAL, THERMOGRAVIMETRY, KINETICS
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

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 themogravimetry (TG/DTG) and differential al analysis (DTA) modules. Experiments were performed with a sample size of similar to10 mg, heating rate of 10degreesC min(-1). Flow rate was kept constant (10 L h(-1)) in the temperature range of 20-900degreesC. 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 chic 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.