An indirect heat gasification technology, compartmented fluidized bed gasification (CFBG) which uses air for combustion and steam as gasification agent, was run in a fluidized bed of binary mixture system by using 'waste' palm shells as the feedstock and sand as the fluidizing medium. In this research, it is more on understanding the driving and resisting forces acts in solid circulation loop in a compartmented fluidized bed perform in boh hot and ambient conditions and finding the most suitable correlation for minimum fluidization velocity (Umf).