Circulating Fluidized Bed Boiler Sample Clauses

Circulating Fluidized Bed Boiler generator utilizing the principles of fluidized bed combustion with gas velocities between 2 - 10 meters/second in the upper section of the combustion furnace. The gas velocity causes the hot bed particles (solids) which can consist of fuel, fuel ash, limestone, and sand to churn and mix within the furnace to evenly burn the fuel, capture sulfur oxides and transfer heat to the walls and other heat absorbing surfaces within the furnace. The gas velocity is high enough to cause the particles to escape from the top of the furnace, which are then captured by solid separators (such as cyclones) and continually returned to the bottom of the furnace. Circulating Fluidized Bed Boilers may include heat absorbing surfaces to capture heat from the particles along their return path to the furnace. Large units (over 300 MWe) can employ once through steam heating circuitry with steam conditions above the critical point of water (221 bar, 374°C) to improve power plant efficiency. The low solids combustion gas then typically passes through a convection Heat Recovery Area (HRA).
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