A backward feeding, double-effect evaporator is used for concentrating an aqueous solution from 5.00% to 35.0% soluble solids. The system consists of two identical evaporation units, each with a heat exchange surface of area of 90 m2. The first effect receives saturated steam at 115°C. The vapor in the second effect leaves at the saturation temperature of 40°C and a flowrate of 3.44 kg/s. The feed solution is introduced into the second effect at its boiling point. An overall heat transfer coefficient of 2400 W m-2 K-1 is assumed for both effects. The condensate in both effects leaves the evaporator as saturated liquid at the steam inlet pressure. Assume an insignificant boiling point elevation and an equal rate of vapor generation in both effects. Determine: a. flowrate (in kg/s) of dilute aqueous solution entering the second evaporator; b. flowrate (in kg/s) of concentrated aqueous solution leaving the first evaporator; c. evaporator temperature (TE1 and TE2) of each evaporator;
A backward feeding, double-effect evaporator is used for concentrating an aqueous solution from 5.00% to 35.0% soluble solids. The system consists of two identical evaporation units, each with a heat exchange surface of area of 90 m2. The first effect receives saturated steam at 115°C. The vapor in the second effect leaves at the saturation temperature of 40°C and a flowrate of 3.44 kg/s. The feed solution is introduced into the second effect at its boiling point. An overall heat transfer coefficient of 2400 W m-2 K-1 is assumed for both effects. The condensate in both effects leaves the evaporator as saturated liquid at the steam inlet pressure. Assume an insignificant boiling point elevation and an equal rate of vapor generation in both effects. Determine: a. flowrate (in kg/s) of dilute aqueous solution entering the second evaporator; b. flowrate (in kg/s) of concentrated aqueous solution leaving the first evaporator; c. evaporator temperature (TE1 and TE2) of each evaporator;
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:A backward feeding, double-effect evaporator is used for concentrating an aqueous
solution from 5.00% to 35.0% soluble solids. The system consists of two identical
evaporation units, each with a heat exchange surface of area of 90 m2. The first effect
receives saturated steam at 115°C. The vapor in the second effect leaves at the
saturation temperature of 40°C and a flowrate of 3.44 kg/s. The feed solution is
introduced into the second effect at its boiling point. An overall heat transfer
coefficient of 2400 W m-2 K-1 is assumed for both effects. The condensate in
both effects leaves the evaporator as saturated liquid at the steam inlet pressure. Assume
an insignificant boiling point elevation and an equal rate of vapor generation in
both effects. Determine:
a. flowrate (in kg/s) of dilute aqueous solution entering the second evaporator;
b. flowrate (in kg/s) of concentrated aqueous solution leaving the first evaporator;
c. evaporator temperature (TE1 and TE2) of each evaporator;
d. flowrate (in kg/s) of steam introduced in the first evaporator; and
e. steam economy.
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