Abstract
The paper reviews the chemical reactions and physical changes of mineral impurities in pulverized coal-fired flames which result in the formation, deposition and retention of sulphates in boiler deposits and in the ash captured in the electrical precipitators. The review is based mainly on the author's own work and it includes the results of laboratory research and boiler plant investigations. British coals when consumed in pulverized fuel-fired boilers result in a retention of sulphates in the ash and boiler deposits which accounts for between 12 and 18% of the total sulphur in coal. The residual alkalinity of pulverized fuel ash derived from bituminous coals is equivalent to a further 4–6% of SO 2 in the flue gas.
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