CONTROL OF BED HEIGHT IN A FLUIDIZED BED GASIFICATION SYSTEM

摘要

13 In a fluidized bed apparatus a method for controlling the height of the fluidized bed, taking into account variations in the density of the bed. The method comprises taking simultaneous differential pressure measurements at different vertical elevations within the vessel, averaging the differential pressures, determining an average fluidized bed density, then periodically calculating a weighting factor. The weighting factor is used in the determination of the actual bed height which is used in controlling the fluidizing means.