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Oxygen Carrier Aided Combustion (OCAC) is a process concept where an oxygen carrier is used during combustion. Fluidized bed boilers are commonly operating with inert bed material, usually quartz sand. In the case of the OCAC, the quartz sand is replaced by an oxygen carrier. The oxygen carrier can undergo oxidation and reduction states. Through these mechanisms, oxygen can be absorbed or released by the oxygen carrier in function of the condition presents in the combustion area. The main advantages that is given by this process is to provide a more efficient mixing, improve the oxygen distribution within the furnace and so the contact between the oxygen and the fuel. Due to this advantage, the combustion yield is better.