A fluidized bed incinerator, 3 m in diameter and 0.56 m high, operates at 8508C using a sand bed. The sand density is 2.5 g/cm3 , and the average sand grain has a mass of 0.16 mg and a sphericity of...

A fluidized bed incinerator, 3 m in diameter and 0.56 m high, operates at 8508C using a sand bed. The sand density is 2.5 g/cm3 , and the average sand grain has a mass of 0.16 mg and a sphericity of 0.85. In the stationary (packed) state, the bed porosity is 35%. Find: (a) The range of air velocities that will fluidize the bed.

(b) The compressor power required if the bed is operated at 10 times the minimum fluidizing velocity and the compressor efficiency is 70%. The compressor takes air in from the atmosphere at 208C, and the gases leave the bed at 1 atm.