Abstract
Boiler slagging jeopardizes the safe and economic operation of coal-fired boilers. Aluminosilicates are the most abundant substances in fly ash and boiler slagging deposits. In order to understand the roles of the fly ash aluminosilicates in slagging, studying their evolution in the ash deposition is invaluable. In this work, 27Al magic angle spinning nuclear magnetic resonance (MAS-NMR) and X-ray diffraction were used to measure the aluminum coordination and the phase distribution in fly ash and ash deposit samples of two USA thermal coals [Powder River Basin (PRB) sub-bituminous coal and Illinois coal] and their blended coal prepared in an oxy-coal combustion experiment apparatus. Morphology and constituents of these samples were also analyzed using scanning electronic microscopy. The results show that, for all fly ashes and ash deposits, the aluminum exists only in aluminosilicates and is mainly four-coordinate aluminum [Al(IV)], with a small amount in six-coordinate aluminum Al(VI) (chemical shift: 2....
Published Version
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