Abstract
In support of the Underground Coal Gasification (UCG) program, Sandia National Laboratories is developing a cavity growth model based on the thermal and structural behavior of the coal. An essential element of this effort is the determination of the thermal and structural properties of coals involved in UCG field tests. One goal of this study is to define a consistent set of thermal and structural properties for the coal in the Big Seam near Centralia, Washington. This goal was accomplished by performing a limited number of properties tests and by correlating the results with properties reported in the literature. These tests included measurement of specific heat, thermal conductivity and thermal expansion. To determine ambient temperature elastic properties, uniaxial compression and indirect tension tests (Brazil), were performed. The results show that the thermal properties are dependent on the water content and that the structural properties are anisotropic and show a high degree of sample-to-sample variability.
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