Since this allows coal plants to burn at cooler temperatures, less NO x is also emitted. The heated precipitate coming in direct contact with the tubes (heating by conduction) increases the efficiency. Limestone is used to precipitate out sulfate during combustion, which also allows more efficient heat transfer from the boiler to the apparatus used to capture the heat energy (usually water tubes). In addition, for any given thermal duty, FBCs are smaller than the equivalent conventional furnace, so may offer significant advantages over the latter in terms of cost and flexibility.įBC reduces the amount of sulfur emitted in the form of SO x emissions. FBC plants are capable of burning a variety of low-grade solid fuels, including most types of coal, coal waste and woody biomass, at high efficiency and without the necessity for expensive fuel preparation (e.g., pulverising). The resultant fast and intimate mixing of gas and solids promotes rapid heat transfer and chemical reactions within the bed. In its most basic form, fuel particles are suspended in a hot, bubbling fluidity bed of ash and other particulate materials (sand, limestone etc.) through which jets of air are blown to provide the oxygen required for combustion or gasification. Fluidized bed combustion ( FBC) is a combustion technology used to burn solid fuels.
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