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Wojtowicz, M.A. (author), Moulijn, J.A. (author)Abstract of WO 9318341 (A1) A method and an apparatus are described for combusting carbonaceous materials in a two-stage process. In a first reaction chamber (2), operating under fuel-rich conditions in a bubbling fluidisation regime, fuel undergoes primary combustion or gasification. Oxidising gas (5) is fed into the first reaction chamber at a...patent 1993