In a fluidized bed combustor of the bubbling-bed type, coal particle size and vertical air velocity are regulated to establish a discrete horizontal plane that divides the active bed from the entrained-flow open furnace above.
The basic mechanism for the control of bed temperature and heat transfer to the walls of the combustor, and to any immersed heating surface in the bed of a fluidized-bed boiler, is the variation in the total solids inventory.
6.6.4 Fluidized-bed combustors Fluidized-bed combustors are capable of burning untreated hog fuel, with moisture levels as high as 55 to 60 percent (100), in a turbulent mixing zone above a fluidized bed of inert silica sand.
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