NOVELTY - System (10) comprises: a first moving bed reactor comprising at least one tapered section and multiple injection gas ports; a second reactor communicating with the first moving bed reactor operable to receive an oxygen source, where the second reactor is configured to regenerate the reduced oxygen carrying material by oxidation; and a non-mechanical valve comprising a circuitous piping assembly disposed between the first moving bed reactor and the second reactor, and at least one gas opening configured to receive a gas stream.    USE - The system is useful for converting fuel (claimed) into heat, power, chemicals, liquid fuels, and/or hydrogen.    ADVANTAGE - The system: utilizes non-mechanical valve that transport solids and configured to prevent gas mixing between reduction reactor and combustion reactor; utilizes gas stream that minimizes static zone and prevents fine accumulation; reduces slugging during fluidization of oxygen carrying materials; has minimal design change, thus economical; and utilizes oxygen carrying material particles that exhibit numerous regeneration cycles, without substantially losing functionality.    DETAILED DESCRIPTION - System (10) comprises: a first moving bed reactor comprising at least one tapered section and multiple injection gas ports, where the multiple injection gas ports are configured to deliver a fuel to the first moving bed reactor, and the first moving bed reactor is configured to reduce an oxygen carrying material with a fuel by defining a countercurrent flowpath for the fuel relative to the oxygen carrying material; a second reactor communicating with the first moving bed reactor operable to receive an oxygen source, where the second reactor is configured to regenerate the reduced oxygen carrying material by oxidation; and a non-mechanical valve comprising a circuitous piping assembly disposed between the first moving bed reactor and the second reactor, and at least one gas opening configured to receive a gas stream, where the gas stream is operable to reduce gas leakage between the first moving bed reactor and the second reactor.    DESCRIPTION OF DRAWING(S) - The figure schematically illustrates the system.    System (10)    Reduction reactor (100)    Condenser (126)    Combustion reactor (300)    Solid conveying system (350)