A study of agglomeration of coal-ash in fluidized beds

Experimental data on agglomeration of coal-ash particles in a fluidized bed have been presented. It has been observed that above the “initial sintering temperature”, the ash particles are defluidized at velocities above their minimum fluidization velocity. The expression for minimum fluidization velocity has been modified by including a force-term due to the phenomenon of sintering in addition to those due to drag, gravity and kinetic energy. On presente des resultats experimentaux sur l'agglomeration de particules de cendres de charbon dans un lit fluidise. On a observe qu'au-dela de la “temperature initiale de frittage”, les particules de cendres etaient defluidisees a des vitesses superieures a leur vitesse minimale de fluidisation. On a modifie l'expression de la vitesse minimale de fluidisation en y incluant un terme de force du' au phenomene de frittage, et qui s'ajoute aux autres termes dus a la resistance au frottement, a la gravite et a l'energie cinetique.