Abstract: A particle storage chamber in a circulating fluid bed boiler having fluidizing means therein to tumble and fluidize the collected ash and ash coated particles. Due to the fuel burned, these ash and ash coated particles contain sodium and potassium compounds which react to lower the eutectic point of the particles thereby causing them to agglomerate or sinter. By fluidizing these particles, they are prevented from reacting through surface contact. Consequently, the ash and ash coated particles do not agglomerate or sinter thereby maintaining the individual characteristics of these particles and allowing smooth flowability for recirculation to the primary furnace zone.