Abstract
A series of tests was conducted in a thermogravimetric analyzer (TGA) to study the sulphation behaviour of limestone in the presence of water over the temperature range of 800–850 °C. Four different Canadian limestones, all with a particle size range of 75–425 μm, were sulphated using a synthetic flue gas with a composition of 15% CO 2, 3% O 2, 0% or 10% H 2O, 1750 ppm SO 2 and the balance N 2. Water was shown to have a significant promotional effect on sulphation, especially in the diffusion-controlled stage. However, the effect of water during the kinetic-controlled stage appeared to be much less pronounced. Based on these results, it is proposed that the presence of water leads to the transient formation of Ca(OH) 2 as an intermediate, which in turn reacts with SO 2 at a faster rate than CaO does. Alternatively stated, it appears that H 2O acts as catalyst for the sulphation reaction of CaO.
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