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1 ) a ) A single stage evaporator is to concentrate 2 5 , 0 0 0 kg / hr of an aqueous slurry at
a A single stage evaporator is to concentrate kghr of an aqueous slurry at
C from to ww solids. Saturated steam is available at C and the
pressure in the evaporator is atm. The heat transfer area of the unit is massuming
there is no boiling point rise or subcooling of the condensate.
Specific heat capacity for water vapour kJ kg K
Specific heat capacity for water and slurry kJ kg K
Overall heat transfer coefficient kW m K
Latent heat of vaporisation of water at C MJ kg
Antoine coefficients for water: A B C
P in mmHg T in K log to base e
It is decided that the system in should be replaced by two stages in a forwardfeed arrangement, with each stage having only half the heatexchange area of the
original stage. The feed and product flow rates and compositions remain the same,
and an identical steam temperature is used.
i Make an approximate analysis by considering the contributions of sensible
heat terms to energy balances to be negligible. Thus calculate the new:
Flow rate of steam required
Temperatures of the two evaporation stages
Steam economy
Ans : TC TC S kg hr
Steam Economy
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