Figure 14.

Schematic representation of mass, energy and enthalpy balances taking place in SD process: the drying medium flowing in at rate $\dot{\mathrm{m}}$_gas,in is pre heated at duty $\dot{\mathrm{Q}}$_in. The solids and liquid mixture enter the spray tower at rate $\dot{\mathrm{m}}$_s,in. The outlet material flows at rate $\dot{\mathrm{m}}$_gas,out and $\dot{\mathrm{m}}$_s,out. The amount of $\dot{\mathrm{Q}}$_loss is expended to the environment. The overall mass balance is calculated by the equation $\dot{\mathrm{m}}$_gas,in + $\dot{\mathrm{m}}$_s,in = $\dot{\mathrm{m}}$_gas,out + $\dot{\mathrm{m}}$_s,out.