Abstract
The fragmentation behaviour of coal in fluidized beds is studied by using three coals having different swelling indices. Experiments were carried out in a 41-mm-diameter turbulent fluidized bed operated at 800°C. Both inert and oxidizing environments were used in a series of tests carried out in this unit. Quantitative analyses of the fragments produced show that primary fragments are more numerous than secondary fragments. The swelling index of the coal exerted a major influence on the primary fragments. The secondary fragmentation was not influenced to a great extent by the combustion.