Coal additives

Abstract From the Canadian patent

A process for combusting a sulphur-bearing fuel is disclosed. A mixture of the fuel a sulphur, binding material and a sulphur retaining material is introduced into a first combustion zone. The mixture is combusted in the first zone under conditions of fuelrich stoichiometry and temperature wherein substantially all of the sulphur is captured in a solid form by the sulphur binding material. The resulting captured sulphur compounds are then physically and/or chemically bound within or with the retaining material. Combustion products are thereby produced which include fuel-rich gases and solid flyash and slag containing mixtures of the captured sulphur and the binding and retaining materials. …