Question: Problems 4.1 mf A stainless steel fluidized bed column has an internal diameter of 0.5 m. It is equipped with a multi-orifice distributor for uniform

Problems 4.1 mf A stainless steel fluidized bed column has an

Problems 4.1 mf A stainless steel fluidized bed column has an internal diameter of 0.5 m. It is equipped with a multi-orifice distributor for uniform gas distribution and two-stage cyclones for capturing and returning entrained particles. The col- umn is 4 m tall, filled with 100 kg sand particles of 150 um in mean diameter and 2600 kg/m3 in density. Assume that , = 0.42. (a) The particles in this column are fluidized at a superficial gas velocity of 0.5 m/s with air at ambient conditions. In what flow regime is this column operated? (b) At the same gas mass flow rate as in (a), the system is now heated from ambient temperature to 500 C. Which flow regime is now applicable? (c) At the same gas mass flow rate as in (b), the column now at 500 C is pressurized to 1000 kPa. What flow regime is now operational? (d) It is desired to operate this column in the turbulent fluidization regime. What is the minimum gas velocity required

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