Steam/Hot-Water Drying of Lignite. Part I. Activities at the University of North Dakota Hot-Water Drying of Lignite to Produce Slurries

摘要

Hot-water slurry drying of low-rank coal produces a slurry which for some coals appears to be stable. With this method of drying, the product does not reabsorb moisture and is partly slurried in its own water. Energy requirements are low because water is removed from the pores of the coal in liquid form by being expelled by carbon dioxide. The carbon dioxide is formed by removing carboxyl groups from the coal structure, which in addition to expelling the water, increases the heating value of the coal and reduces the sodium content, potentially making it a low fouling fuel. Slurries produced by this method potentially can be used in direct combustion as replacement for fuel oil or in Texaco gasifier. 10 figures, 1 table. (ERA citation 08:033079)