Abstract
The attrition characteristics of limestone have an important influence on the material balance and the efficiency of desulfurization in circulating fluidized bed boiler. By means of XRD, XRF, SEM and BET analysis, the attrition behaviour and morphology of two kinds of limestone with different particle sizes were studied by investigating the effects of simultaneous reaction of sulfation and calcination, sulfation reaction, oxygen-enriched flue gas atmosphere.The variation trend of attrition rate constant under simultaneous reaction is similar to that under only sulfation condition. Both of these conditions decrease with time and then reach a stable value. The attrition rate of finer limestone is higher than that of coarser limestone in a certain size range. The attrition rate of limestone in air atmosphere is the largest, while, in SO2 atmosphere it's far less. This is mainly caused by the formation of CaSO4 layer that reduces the attrition rate. By calculating the conversion of Ca to CaSO4, it is found that the conversion increases with time, but the increasing rate decreases gradually. The increase of SO2 concentration leads to the increase of final conversion. In the oxygen-enriched flue gas atmosphere, the limestone is more attrition-resistant than that in the air.
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