As gas velocities are increased the bed surface becomes more and more dispersed and solids entrainment increases to the point that solids recirculation (usually with a cyclone) is required to maintain bed inventory. This state has been referred to as a "circulating" or "fast" fluidization.
Fine particles of partly burned coal ash and bed material are carried along with the flue gases to the upper areas of the furnace and then into a cyclone. In the cyclone the heavier particles separate from the gas and falls to the hopper of the cyclone. This returns to the furnace for recirculation. so the name Circulating Fluidized Bed combustion.
The conditions for CO2 reduction in a circulating fluidized bed (CFB) oxy-boiler are studied that is operation with pure oxygen diluted by recirculated flue gases to moderate the combustion ...
Nov 17 2020 · In this study energy exergy environment and economic (4E) analyses were performed for a 500MW e oxycoal ultrasupercritical circulating fluidizedbed (CFB) power plant with CO 2 capture. The effect of the location of fluegas recirculation (FGR) on the 4E values was investigated for wet FGR (wFGR) at 170°C dry FGR (dFGR) at 68°C and 80% wet and 20% dry FGR (wdFGR).