Fluidized bed combustion (FBC) systems are widely used for power generation. FBC systems can be modified to be circulating FBC (CFBC), where the material is circulated back into the combustion chamber for burning up. FBC systems are generally limited to a size of less than 300 MW, but there is powerplant in Lagisza, Poland who designed it to 460 MW and hopes can be scaled up to 600-800 MW in the future. FBC and CFBC system is important because coal power plant that has long operated can be repowered, opening the possibility of cofiring with biomass on a wider scale conditions. The advantages of FBC systems include:
-Ability to burn fuels with a wide range in moisture content, particle size, and density. And the potential for this type of fuel coal, biomass, tire-derivated-fuel, agricultural residues, and urban wood wastes.
-Heat transfer from combustion more efficient so that the combustion temperature is lower, which in turn will reduce NOx emissions.
-Lower costs for SO2 capture because limestone can be added directly to the medium fluidization at a lower cost than installing scrubbers after combustion.