Despite the increase in the fuel price, rice husk is still one of the most attractive renewable energy sources for heat and power generation in small power plants, generally using fluidized-bed combustion for utilization of this agricultural residue. A large number of pioneering research studies have therefore been devoted to combustion efficiency and emission performance of rice husk-fuelled combustors with different design features, the most typical ones being represented by cylindrical and prismatic reactors operated in the bubbling or circulating fluidization regime. The combustion efficiency of these combustion techniques is reported to be in the range from 81% to 98% depending on the method of air supply [8], [9], [10], [11] and [12]. Elevated unburned carbon content in fly ash as well as CO emission are the main factors responsible for the deterioration of combustion efficiency when firing rice husk [8] and [10].