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The rate of reaction of calcined limestone with SO 2 and O 2 was measured at conditions that eliminate all resistances not associated with the CaO grain surface. Reactivity increased with the square of the BET surface area when grain size was varied as an experimental parameter. The observed effects of surface area and temperature account for the SO 2 capture reported for boiler tests of the limestone injection process.
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Borgwardt et al. (1986) studied this question.
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