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Show INTRODUCTION Various coal combustion phenomena have been scientifically investigated for several decades now and remain very complex, inadequately understood, and controversial. This dilemma is the result, in large measure, of the simple fact that there is actually no such material as coal, but that there are only coals, ranked according to various physicochemical criteria. With recent decisions to temporarily delay or even cancel coal or shale oil conversion scenarios, involving liquefaction and gasification, or extraction, respectively, the direct combustion of pulverized coal and of coal-bearing slurry fuel petroleum-oil-surrogates has taken on an increased and timely importance. Because of this situation, it is now imperative to begin to systematize and unify with dispatch past and present experience and knowledge of neat and slurry pulverized coal combustion so that the conversion of coal-fired, and, more importantly, oil-fired units to available solid fuels becomes less problematic. It is just this task that will be reported upon in this paper. 17-2 |