Physical and chemical properties of selected Turkish lignites and their pyrolysis and gasification rates determined by thermogravimetric analysis

Cakal G. O., Yucel H., Guruz A. G.

JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS, vol.80, no.1, pp.262-268, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 80 Issue: 1
  • Publication Date: 2007
  • Doi Number: 10.1016/j.jaap.2007.03.005
  • Journal Name: JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.262-268
  • Keywords: lignite, CO2-gasification, pyrolysis, reactivity, TGA, HEAT-TREATED COALS, CARBON-DIOXIDE, CHAR GASIFICATION, ACTIVATED CARBONS, PORE STRUCTURE, SURFACE-AREA, REACTIVITY, TEMPERATURE, BEHAVIOR, DECOMPOSITION
  • Middle East Technical University Affiliated: Yes

Abstract

Pyrolysis and CO(2)-gasification behavior of lignites representing four different deposits in Turkey were investigated by Thermogravimetric Analysis (TGA) in the temperature range from 750 degrees C to 1000 degrees C. The rates of pyrolysis and CO(2)-gasification were evaluated from the corresponding TGA profiles. As expected, maximum pyrolysis rates for each coal were shown to be constant with respect to the final carbonization temperature. Lignites used in this study are from the tertiary period, chosen from major coal deposits in Turkey and their carbon contents are in the range of 60-70% (daf) based on ultimate analysis. They have shown different gasification reactivities under similar conditions and the reactivity sequence was found to be temperature dependent.