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A triple-effect forced-circulation evaporator is to be fed with 20,000 lb/h of 30% NaOH solution at a temperature 90°F. The concentrated liquor is to be 60% NaOH solution. Saturated steam at 20.7lbf /in² gauge is to be used, and the condensing temperature of vapor from the third effect is to be 100°F. The feed order is II,III,I. Radiation and undercooling of condensate may be neglected. Estimated overall coefficients (BTU/ft²-h-°F) corrected for boiling-point elevation are given below. Calculate (a) the heating surface required in each effect, assuming equal surfaces in each, (b) the steam consumption, (c) the steam economy. Effect I 11 III Overall Coefficient 700 1000 800

A triple-effect forced-circulation evaporator is to be fed with 20,000 lb/h of 30% NaOH solution at a temperature 90°F. The concentrated liquor is to be 60% NaOH solution. Saturated steam at 20.7lbf /in² gauge is to be used, and the condensing temperature of vapor from the third effect is to be 100°F. The feed order is II,III,I. Radiation and undercooling of condensate may be neglected. Estimated overall coefficients (BTU/ft²-h-°F) corrected for boiling-point elevation are given below. Calculate (a) the heating surface required in each effect, assuming equal surfaces in each, (b) the steam consumption, (c) the steam economy. Effect I 11 III Overall Coefficient 700 1000 800

Introduction to Chemical Engineering Thermodynamics
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
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A triple-effect forced-circulation evaporator is to be fed with 20,000 lb/h of 30% NaOH solution at a temperature 90°F. The concentrated liquor is to be 60% NaOH solution. Saturated steam at 20.71bf /in² gauge is to be used, and the condensing temperature of vapor from the third effect is to be 100°F. The feed order is II,III,I. Radiation and undercooling of condensate may be neglected. Estimated overall coefficients (BTU/ft²-h-°F) corrected for boiling-point elevation are given below. Calculate (a) the heating surface required in each effect, assuming equal surfaces in each, (b) the steam consumption, (c) the steam economy. Effect || ||| |||| Overall Coefficient 700 1000 800
Transcribed Image Text:A triple-effect forced-circulation evaporator is to be fed with 20,000 lb/h of 30% NaOH solution at a temperature 90°F. The concentrated liquor is to be 60% NaOH solution. Saturated steam at 20.71bf /in² gauge is to be used, and the condensing temperature of vapor from the third effect is to be 100°F. The feed order is II,III,I. Radiation and undercooling of condensate may be neglected. Estimated overall coefficients (BTU/ft²-h-°F) corrected for boiling-point elevation are given below. Calculate (a) the heating surface required in each effect, assuming equal surfaces in each, (b) the steam consumption, (c) the steam economy. Effect || ||| |||| Overall Coefficient 700 1000 800
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