NOVELTY - Fluidized bed reactor system comprises: at least two fluidized bed reactors comprising a first and a second reactor (1, 2), which are each designed as a circulating fluidized bed; a particle line comprising a particle separator (3) for transporting fluidized bed particles from the first into the second reactor; and a particle line leading out in the lower half of the second reactor for transporting fluidized bed particles back into the first reactor, where, reaction zones that are separated from one another are provided in the second reactor.    USE - The fluidized bed reactor system is useful for carrying out physical or chemical reactions in the reaction zones of the system (claimed), preferably coal or biomass gasification.    ADVANTAGE - The fluidized bed reactor system has continuous operation and is an improved system for providing the reactions in rapid, complete, and more economical manner with higher yields.    DETAILED DESCRIPTION - Fluidized bed reactor system comprises: at least two fluidized bed reactors comprising a first and a second reactor (1, 2), which are each designed as a circulating fluidized bed; a particle line comprising a particle separator (3) for transporting fluidized bed particles from the first into the second reactor; and a particle line leading out in the lower half of the second reactor for transporting fluidized bed particles back into the first reactor, where reaction zones that are separated from one another by flow regulators are provided in the second reactor, and the particle line opens into the second reactor above at least one flow regulator. An INDEPENDENT CLAIM is also included for method of using the bed reactor system comprising carrying out chemical reactions in the reaction zones of the system.    DESCRIPTION OF DRAWING(S) - The figure shows the fluidized bed reactor system with flow controls only in the second reactor.    First reactor (1)    Second reactor (2)    Particle separator (3)    Particle separator (4)    Gas outlet (5)