Reactor system and method

A reactor system comprising a fuel reactor, said fuel reactor comprising a carrier bed that includes an oxygen carrier for oxidizing fuel, said oxygen carrier in said reactor oxidizing fuel in either a full-oxidation mode or a partial-oxidation mode, said fuel reactor primarily producing gases for the production of combined heat and power when operated in said full-oxidation mode and primarily producing syngas when operated in said partial-oxidation mode, said reactor system further comprising

• a burn-off reactor for substantially complete oxidation of fuel, wherein partially oxidized fuel is transferred from said fuel reactor to said burn-off reactor to complete oxidation
• wherein said fuel reactor and said burn-off reactor can be operated simultaneously, said fuel reactor operating in partial oxidation mode so that said fuel reactor produces syngas and combined heat and power while said burn-off reactor produces gases for the production of combined heat and power,
• further wherein at least a portion of oxygen-lean carrier from said burn-off reactor can be transferred to a regeneration reactor where said portion of oxygen-lean carrier can be reoxygenated to produce oxygen-rich carrier,
• further wherein at least a portion of said oxygen-rich carrier can be transferred back to said fuel reactor,
• and further wherein at least a portion of said oxygen-rich carrier is held in an accumulator before being transferred to said fuel reactor.