THE SPECIFIC-HEATS OF COALS, COKES AND THEIR ASHES

Specific heats of a range of coals, cokes and ashes have been measured from 300 to 600 K (coals, cokes) or 1000 K (ashes) using differential scanning calorimetry. There is a rapid increase of specific heat with the content of volatile matter in the region 0-10 wt% followed by only mild increases at higher concentrations. A general equation is given expressing the heat capacity of a daf coal in terms of proximate composition and temperature. It provides a simple and accurate method of assessing enthalpy changes up to 600 K-the onset of volatilization for many bituminous coals.