NOVELTY - System comprises: a decarbonizer (201) segment configured such that at least a solid sorbent reacts with the fuel gas and steam to remove carbon from the input fuel gas and to produce the output fuel gas stream in an exhaust gas from the decarbonizer; and a calciner (202) segment configured such that the solid sorbent from the decarbonizer segment reacts to release the carbon as carbon dioxide into the carbon dioxide gas stream.    USE - The system is useful for processing an input fuel gas and steam to produce separate carbon dioxide and output fuel gas streams (claimed).    ADVANTAGE - The system: reduces the degree of carbonation of the sorbent to 6% by utilizing a high solids flow, thus the effect of reactive sintering is reduced and the sorbent may be replenished periodically; reduces the external energy input; and provides a process which is cost effective.    DETAILED DESCRIPTION - System comprises: a decarbonizer (201) segment configured such that at least a solid sorbent reacts with the fuel gas and steam to remove carbon from the input fuel gas and to produce the output fuel gas stream in an exhaust gas from the decarbonizer; and a calciner (202) segment configured such that the solid sorbent from the decarbonizer segment reacts to release the carbon as carbon dioxide into the carbon dioxide gas stream, where the system is configured such that carbon dioxide partial pressures and temperatures in the decarbonizer and calciner segments respectively are controlled such that the temperature in the decarbonizer segment is higher than the temperature in the calciner segment such that heat is provided from the decarbonizer to the calciner. An INDEPENDENT CLAIM is also included for processing an input fuel gas and steam to produce separate carbon dioxide and output fuel gas streams, comprising: using a decarbonizer segment for reacting at least a solid sorbent reacts with the fuel gas and steam to remove carbon from the input fuel gas and to produce the output fuel gas stream in an exhaust gas from the decarbonizer; and using a calciner segment for reacting the solid sorbent from the decarbonizer segment therein to release the carbon dioxide into the carbon dioxide gas stream.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a process flow and reactor system for a flexible fuel Endex reactor.    Flexible fuel Endex reactor (200)    Gas decarbonizer (201)    Calciner (202)    Combustor (203)    Syngas (206)