Abstract
Heating values (both for original and devolatilized samples) and proximate analyses of 26 selected Turkish coals with widely varying characteristics (from bituminous coal to low grade lignite) are determined utilizing an isothermal calorimeter and a special coal analyser. Analysis of experimental results indicates that the heating value of volatile matter is strongly correlated with the heating value of coal on a dry, ash-free basis. This correlation is expressed as a simple second degree polynomial that reproduces experimental results with very high accuracy. A second correlation is also developed for estimating the heating value of Turkish coals that employs only proximate analysis data. Application to 47 different coals reveals that this correlation compares favourably with previous correlations based on proximate analysis, and its accuracy is also comparable with correlations based on elemental analysis.
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