Abstract: A circulating fluidized bed reactor comprises a reaction chamber (10) with an upwardly directed flow of gas with entrained particulate solid material, a separator (18) for separating the particles from the gas flow, and a particle recycling system (23) for controlled return of the particles to the reaction chamber (10). The particle recycling system (23) may comprise means (47) for controlled return of the particles in a non-cooled condition and superposed fluid beds (55 and 59) which may be connected in parallel or in series as desired for returning particles to the reaction chamber in a more or less cooled condition. The reactor may also render it possible to return various fractions of the particles into the reactor chamber (10) at different levels.

Abstract: A circulating fluidized bed reactor comprises a reaction chamber (10) with an upwardly directed flow of gas with entrained particulate solid material, a separator (18) for separating the particles from the gas flow, and a particle recycling system (23) for controlled return of the particles to the reaction chamber (10). The particle recycling system (23) may comprise means (47) for controlled return of the particles in a non-cooled condition and superposed fluid beds (55 and 59) which may be connected in parallel or in series as described for returning particles to the reaction chamber in a more or less cooled condition. The reactor may also render it possible to return various fractions of the particles into the reactor chamber (10) at different levels.