Abstract
Coal combustion with O 2/CO 2 is promising because of its easy CO 2 recovery, extremely low NO x emission and high sulfation efficiency. The mechanism of direct sulfation of limestone under high CO 2 concentration, different from that of CaO–SO 2 sulfation, is one of the factors to account for its high sulfation efficiency. However, many unknowns about the mechanism of direct sulfation exist. The mechanisms and kinetics of direct sulfation were examined. Both experiment and modeling suggested that sintering is much mitigated during direct sulfation of limestone. The rate of direct sulfation does not decrease so much with sulfation degree as CaO–SO 2 sulfation. Direct sulfation is favorable for high sulfation degree. Furthermore, the diffusivity in the product layer demonstrates high temperature dependence and hardly changes with sulfation degree. This result is associated with the fact that the calcium sulfate layer produced is porous owing to CO 2 formation.
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