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A fluidized bed reactor is to be sized to dry 5000 kghr dry basis of spherical polymer beads that are uniformly 1mm in diameter The beads will enter the dryer at 25°C with a moisture content of

A fluidized bed reactor is to be sized to dry 5000 kg/hr (dry basis) of spherical polymer beads that are uniformly 1mm in diameter. The beads will enter the dryer at 25°C with a moisture content of 80% (dry basis). The drying medium is su preheated steam at 250°C. The pressure in the vapor space above the bed will be 1 atm. A fluidisation velocity of twice the minimum will be used to obtain bubbling fluidisation. The bed, exit solids and exit vapour temperatures can all be assumed to be 100°C. The beads are to be dried to a moisture content of 10% dry basis. The bed void fraction before fluidisation is 0.47, the specific heat of dry polymer is 1.15 kJ/kg.K and the density is 1500 kg/m3. Batch fluidisation experiments show that drying takes place in the falling rate period,as governed by diffusion where 50% of the moisture is evaporated in 150s. Bed expansion is expected to be 20%. Determine the dryer diameter, average bead residence time, and expanded bed height.Is the dryer a reasonable size? If not what changes in operation can be made to the size reasonable? In adfition, calculate the entering superheated steam flowrate and the necessary heat transfer rate.

Jul 22 2020 View more View Less

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