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Fluidized bed combustion is an efficient process for burning solid fuels. A variety of fuel types and qualities can be effectively burned with low emission. Both types, bubbling and circulating, rely on a large fluidized mass of inert bed material to support combustion and heat transfer. The solids enable low combustion temperatures and greatly improve heat transfer. Bubbling bed boilers maintain a dense fluidized bed with a fixed level in the bottom of the boiler, and circulating bed boilers distribute solids throughout. The solids greatly improve heat transfer and enable low combustion temperatures.