A fluidized bed incinerator operates with high temperature air and uses sand as

Question

A fluidized bed incinerator operates with high temperature air and uses sand as a carrier solid. Find the pressure drop across the bed operating at ten times the minimum fluidization velocity. The outlet of the bed is atmospheric pressure, 101, 325 Pa. Data: Incinerator: 3 meter inside diameter; slumped bed height = 0.56 m epsilon=0.36 (slumped); epsilon_mf=0.44 (minimum fluidization); epsilon_f= 0.54 (fully fluidized) solids (sand) rho_s=2500 kg/m^3; equivalent spherical diameter = 440 mu m Temperature: 850 degree C (assume constant throughout the bed) Air: mu_air, 850 degree c = 4.5 times 10^-5 kg/m middot s To calculate air density, assume the average pressure across the bed Molecular weight of air = 28.9 g/gmole; R=8.314 m^3 middot kPa/K middot mol

Explanation / Answer

Assuming density of 1.23 kg/m3.

The drop for the minimumfludizastion is 67 bar.

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