Abstract
This chapter introduces the fluidized bed boiler process, concentrating on solid biomass burning. It starts by presenting the principle of fluidization. It then explains the operation of the two leading commercial-type boilers: the bubbling fluidized bed (BFB) and circulating fluidized bed (CFB). The advantages of burning solid biofuels in a fluidized bed boiler are explained. Various challenges of fluidized boiler operation are outlined including coarsening, removal of bottom ash, control of particle size in the bed, fuel feeding, limestone feeding, and load control. Then particle separation equipment in CFB boilers is discussed. At the end of the chapter the heat transfer and furnace design are reviewed, along with solids profiles in the furnace and new variations of heat transfer surfaces.
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