Effect of heating rate on pyrolysis kinetics of Tuncbilek lignite


Guldogan Y. , Bozdemir T., Durusoy T.

ENERGY SOURCES, cilt.22, ss.305-312, 2000 (SCI İndekslerine Giren Dergi) identifier

  • Cilt numarası: 22 Konu: 4
  • Basım Tarihi: 2000
  • Doi Numarası: 10.1080/00908310050013901
  • Dergi Adı: ENERGY SOURCES
  • Sayfa Sayıları: ss.305-312

Özet

Pyrolysis kinetics of the Tuncbilek lignite was investigated by thermogravimetric analysis in the present study. All experiments were conducted at nonisothermal conditions with a heating rate range of 10-80 K/min in the pyrolysis temperature interval 298-1173 K under argon atmosphere. Although some differences were obtained in TG/DTG curves of the lignite samples at different heating rates, the same volatile matter yield of 40.7% of the total weight of the sample was calculated in the same temperature range of 673-873 K of the TG curves. Kinetic parameters were determined with the use of the proposed model. A comparison of the experimental and model values of the weight of lignite at arty time was presented. Lower activation energies were calculated at higher heating rates for Tuncbilek lignite. Minimum activation energy was obtained as 24.8 kJ/mol at the heating rate value of 60 K/min. It appears to be the lowest one when compared to those obtained from the literature.