Fluidized Bed Mass Throughput

[bonzoboy]

Considering an atmospheric fluidized bed, like one that might be used to burn coal or shredded tires. What would be an reasonable mass throughput per unit area of the bed (assuming the bed is something like limestone/dolomite). I was looking at a process, and trying to figure out how many tons per day it might handle, and thought the best way to figure out a size would be to get a feel for the mass flow per unit area? And any thoughts on the average "bed velocity" in a non-spouted bed FB?

Thanks all!