[Anglais] Fluidized bed combustion, less NOx more HAP

FBC reduces the amount of sulfur emitted in the form of SOx emissions. 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). The heated precipitate coming in direct contact with the tubes (heating by conduction) increases the efficiency. This allows coal plants to burn at cooler temperatures, reducing NOx emissions in exchange for increasing PAH emissions. FBC boilers can burn fuels other than coal, and the lower temperatures of combustion (800 °C; 1,470 °F) have other added benefits as well.