Most coal requires some preparation before use Preparation may range from simply crushing to provide a size consist suitable for certain types of boilers to extensive size reduction and cleaning to remove sulfur and ash forming mineral matter At present
·Washington DC A novel technology that could help release some of the currently unusable energy in an estimated 2 billion tons of coal waste has been successfully demonstrated by a Department of Energy DOE supported The full scale test of the advanced hyperbaric centrifuge technology at a Jim Walter Resources Inc coal cleaning plant
According to the annual census of coal preparation plants conducted by Coal Age [] the USA operates 286 coal preparation plants in 12 number is relatively small by comparison to the worldwide fleet which is estimated to be 2 283 plants [] The capacity of the plants can range from less than 200 t/h for small operations to 6 000 t/h or more for large industrial plants
·The successful demonstration of Vujnovic technology was reported by Harrison et al [41] in which the developed apparatus was retrofitted in coal cleaning plants situated in Pennsylvania and Illinois Basin of the USA The outcomes of the experiments showed enhancement in clean coal yield from 3% to 10% more extraction of clean coal and
·The transition to clean coal technology poses the risk of transferring pollution from the downstream to the upstream stages of the coal life cycle thereby concentrating it in coal production areas The amount of coal treated in the coal washing plants of coal producing regions has dramatically increased in response to the decline in the
·The flowsheet for a coal preparation plant can typically be represented by a series of sequential unit operations for sizing cleaning and dewatering Fig This sequence of steps is repeated for each size fraction since the processes used in modern plants have a limited range of applicability in terms of particle size Osborne 1988 As a result modern plants may
·COAL PREPARATION AND CLEANING 49 FIGURE 1 Numerous micrometer size crystals of pyrite are dispersed among the coalified plant fibers of Iowa bituminous coal after Greer 1981 the fraction of western coal cleaned is much smaller However recent studies have shown that coal cleaning can provide several important economic
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