Particles containing CaS are fluidized by an O2-containing gas in a first bed (compartment 1) under such conditions that some, but not all, the CaS is converted to CaSO4 with the liberation of heat but with substantially no evolution of sulfur moieties. Particles containing CaSO4 and the remaining CaS pass to another bed (between baffles 2 and 3) wherein they are fluidized by an O2- containing gas under such conditions that CaS is converted to CaO with the liberation of sulfur moieties, recoverable as (e.g.) SO2 or elemental sulfur. Particles containing CaSO4, CaO and unchanged CaS may be passed to a third bed (9) and fluidized therein by an O2-containing gas under such conditions that substantially all the CaS is oxidized to CaSO4 with no liberation of sulfur moieties. The resulting hot particles containing CaSO4 and CaO are preferably used for the oxidation and desulfurization of a sulfur-containing fuel in a fluidized bed (8) between the first and third beds. IMAGE
展开▼
