Thermal Upgrading of Low-Grade, Low-Rank South Australia Coal
- 1 April 1992
- journal article
- research article
- Published by Taylor & Francis Ltd in Energy Sources
- Vol. 14 (2), 169-181
- https://doi.org/10.1080/00908319208908718
Abstract
Experimental data are reported on the extents and rates of removal of impurities from a low-grade, low-rank South Australia lignite by thermal treatment of coal-water slurries in the temperature range 250-3S0“C, Removal of up to 80% of the water, 50% of the oxygen, 40% of the organic sulfur. 60% of the sodium chloride, and 30% of the “ash” constituents has been achieved, with a coal product yield of about 80% (dry, mineral-matter-free basis), containing over 98% of the original coal energy. Process thermal efficiency is estimated to be ∼95%. A distributed activation energy model provides a satisfactory fit to experimental data for the evolution of volatile species.Keywords
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