Abstract
Slaging combustors with injected lime or limestone are being considered as replacements for conventional coal burners. They have advantages in that they can be staged to reduce NO x and SO x emissions. Iron oxide, as an alternative to lime or limestone, may be effective not only as a desulfurizing agent, but under the right conditions of oxygen potential and after combination with sulfur, the reaction products of coal gases with iron oxide can act as a flux to produce a fluid phase. The thermodynamic conditions for effective use of these sorbents is determined for the first stage of a combustor fed one of several Illinois coals. These conditions include contact of the gas with the following phase combinations: CaO/CaSO 4 , CaO/CaS, and Fe/FeO/liquid for the temperature range 950-1300 o C
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