Abstract
AbstractElectron microprobe analyses were made of the residual ash particles remaining after combustion in air at 1200 K of samples of representative coals used in thermal power plants and of samples of Northern Ireland lignite. Local associations of sulphur and calcium in the small areas analysed (c. 10 μm) were ascribed to the formation of the relatively stable CaSO4. This correlation was not linear and it was concluded that locally CaO reacted preferentially with the acidic oxides of silicon and aluminium to form calcium alumino‐silicates. We recommend, therefore, that in assessing the amount of CaCO3 or Ca(OH)2 that must be added to a given fuel to achieve effective desulphurisation, due account must be taken of the ability of the constituent oxides in that coal to react with the additive.
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