A triple effect evaporator is evaporating a sugar solution with negligible boiling point rise (less than 1.00 K, which will be neglected) and containing 4 wt.% solids to 20 wt.% solids. Saturated steam at 180 kPa abs is being used. The pressure in the vapor space of the third evaporator is 10 kPa. The feed rate is 25,000 kg/h and the temperature is 300 K. The liquid heat capacity is Cp = 4.75 – 2.45x, where Cp is in kJ/kg·K and x in wt. fraction of solids. The heat transfer coefficients are U1 = 3200, U2 = 2700, U3 = 1200 W/m2 ·K. Calculate the surface area of each effect if they are of the same area, the steam rate, and the steam economy for the following: a. forward feed b. backward feed c. mixed feed
A triple effect evaporator is evaporating a sugar solution with negligible boiling point rise (less than 1.00 K, which will be neglected) and containing 4 wt.% solids to 20 wt.% solids. Saturated steam at 180 kPa abs is being used. The pressure in the vapor space of the third evaporator is 10 kPa. The feed rate is 25,000 kg/h and the temperature is 300 K. The liquid heat capacity is Cp = 4.75 – 2.45x, where Cp is in kJ/kg·K and x in wt. fraction of solids. The heat transfer coefficients are U1 = 3200, U2 = 2700, U3 = 1200 W/m2 ·K. Calculate the surface area of each effect if they are of the same area, the steam rate, and the steam economy for the following: a. forward feed b. backward feed c. mixed feed
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
Related questions
Question
A triple effect evaporator is evaporating a sugar solution with negligible boiling point rise
(less than 1.00 K, which will be neglected) and containing 4 wt.% solids to 20 wt.% solids.
Saturated steam at 180 kPa abs is being used. The pressure in the vapor space of the third
evaporator is 10 kPa. The feed rate is 25,000 kg/h and the temperature is 300 K. The liquid
heat capacity is Cp = 4.75 – 2.45x, where Cp is in kJ/kg·K and x in wt. fraction of solids.
The heat transfer coefficients are U1 = 3200, U2 = 2700, U3 = 1200 W/m2
·K. Calculate the
surface area of each effect if they are of the same area, the steam rate, and the steam
economy for the following:
a. forward feed
b. backward feed
c. mixed feed
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by step
Solved in 5 steps with 9 images
Recommended textbooks for you
Introduction to Chemical Engineering Thermodynami…
Chemical Engineering
ISBN:
9781259696527
Author:
J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:
McGraw-Hill Education
Elementary Principles of Chemical Processes, Bind…
Chemical Engineering
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY
Elements of Chemical Reaction Engineering (5th Ed…
Chemical Engineering
ISBN:
9780133887518
Author:
H. Scott Fogler
Publisher:
Prentice Hall
Introduction to Chemical Engineering Thermodynami…
Chemical Engineering
ISBN:
9781259696527
Author:
J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:
McGraw-Hill Education
Elementary Principles of Chemical Processes, Bind…
Chemical Engineering
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY
Elements of Chemical Reaction Engineering (5th Ed…
Chemical Engineering
ISBN:
9780133887518
Author:
H. Scott Fogler
Publisher:
Prentice Hall
Industrial Plastics: Theory and Applications
Chemical Engineering
ISBN:
9781285061238
Author:
Lokensgard, Erik
Publisher:
Delmar Cengage Learning
Unit Operations of Chemical Engineering
Chemical Engineering
ISBN:
9780072848236
Author:
Warren McCabe, Julian C. Smith, Peter Harriott
Publisher:
McGraw-Hill Companies, The