Find the following:

a$.$ The coal feed rate per unit area of bed

b$.$ The heat input rate per unit area of bed $(k\frac{W}{m^2})$

c$.$ The heat removal rate from the bed per unit area of bed $(k\frac{W}{m^2})$

d$.$ The heat transfer rate from the products above the bed to drop the tem$-$

perature to $400K(\frac{kW}{m^2}).$A fluidized bed operates with a superficial velocity of $1\mathrm{.}5\frac{m}{s}$ at $1$atm and

$1200K.$ Lignite coal is burned in the bed with $20\%$ excess air. Assume that

the fuel burns completely in the bed. The coal and air enter at $298K.$ Use

air properties to determine the density of the products. Use lignite coal with

the following analysis: