Abstract
To utilize low rank coal more efficiently, it is indispensable to clarify the coal-water interaction. In this work we presented a new method to estimate the distribution of the heat of adsorption, f(Q), for the adsorption of water on coal. A modified adsorption theory on the heterogeneous surface was applied to develop this new method. The distribution, f(Q), could be estimated easily from three sets of adsorption isobars measured by gravimetry. The method does not require any a priori assumptions for functional forms of f(Q) and adsorption equilibrium constant, K_0(Q). The Q value for water-dried coal systeam was found to be significantly different from that for water-raw coal system through the analysis by the proposed method.
