Patent ID: 6230664
Filing Date: 2001-05-15
Classification: F23C,F23L

Abstract:
A method of supplying air to a fluidized bed boiler containing a fluidized bed and defining an undivided space above the fluidized bed, in which method air for combustion, in addition to air supplied into the fluidized bed, is supplied to the fluidized bed boiler from various levels of the fluidized bed boiler, each said level being above the fluidized bed in a vertical direction, and in which method, at at least one air supply level, air for combustion is supplied to the undivided space above the fluidized bed such that four vortexes spinning around vertical axes are formed in the undivided space above the fluidized bed, the vortexes spinning, in pairs, in opposite directions so that the adjacent vortexes always spin in opposite directions, and wherein air to form the vortexes is supplied into the undivided space above the fluidized bed so that air jets flow in the spinning directions of at least two vortexes spinning in opposite directions.