A granular polymeric material with an initial moisture content of $0\mathrm{.}550$ kg H$2$O$/$kg dry matter will be dried in a fluidized bed dryer to a moisture content of $0\mathrm{.}045$ kg H$2$O$/$kg dry matter. The polymeric moist solid is fed to the fluidized bed at a flow rate of $4500$ kg$/$h at $38\backslash$deg C$.$ The moisture content of the drying air is $0\mathrm{.}05$ kg H$2$O$/$kg dry air and it enters the dryer at $125\backslash$deg C$.$

Since the polymeric solid decomposes at $90\backslash$deg C$,$ the exit temperature of the product from the dryer was chosen as $80\backslash$deg C$.$ The experimentally determined minimum fluidization speed of the moist polymer is um $=1\mathrm{.}52$ m$/$s$.$ density$=1200$ kg$/$m$3,$ heat capacity $=0,504$ kcal$/$kg$.\backslash$deg C$.$a$)$ Determine the required air flow rate

b$)$ Risk of condensation of the air coming out of the dryer

Check for

c$)$ Maximum air speed and minimum fluidization.

required dryer space at twice the speed.

determine

d$)$ According to the given grain size distribution, the particles

Determine whether there will be drift $($dust drift$)$ with the drying air by calculating the particle size to be dragged.