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Why pulverized coal is used in a power plant bright hub ,jan 29, 2010 modern boilers powder the coal to a very fine dust so that while burning, it is almost like a fluid stream. the size of the coal particles is in the range of microns. the loss due to unburned carbon is only in the range of 0.5 or less making the boilers very efficient. the pulverizer does the powdering or the pulverizing. pulverizers