Abstract
Abstract The presence of sodium and chlorine in coals often causes fouling and corrosion of boiler tubes and downstream equipment in power plants. These elements are also suspected of augmenting materials problems in fluidized-bed combustors and coal-burning gas turbines. Battelle Columbus Laboratories has developed a process to remove the sodium and chlorine from coal. Experiments carried out with Illinois No. 6 coal suggest that substantial reductions in sodium and chlorine levels can be achieved by extracting the coal with water in the presence of calcium oxide under appropriate conditions. The degree of removal is a function of temperature, extraction time, and coal particle size, and is independent of the water-to-coal ratio. The effects of these process variables on removal are discussed. The data are also interpreted to postulate the mode of sodium and chlorine occurrence in coal.
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