A triple effect standard vertical tube evaporator each effect of which has 140 m² of heating surface is to be used to concentrate from 5 % solids to 40% solids a solution possessing a negligible boiling point elevation. Forward feed is to be used. Steam is available at 120°C, and the vacuum in the last effect corresponds to a boiling temperature of 40°C. The overall coefficients in W/m2-°C are 2950 in I, 2670 in IIl and 1360 in III, all specific heats may be taken as 4.2J/g°C, and radiation is negligible. Condensates leave at condensing temperature. The feed enters at 90°C. Calculate a) the kilograms of 5% liquor that can be concentrated per hour and b) the steam consumption in kilograms per hour
A triple effect standard vertical tube evaporator each effect of which has 140 m² of heating surface is to be used to concentrate from 5 % solids to 40% solids a solution possessing a negligible boiling point elevation. Forward feed is to be used. Steam is available at 120°C, and the vacuum in the last effect corresponds to a boiling temperature of 40°C. The overall coefficients in W/m2-°C are 2950 in I, 2670 in IIl and 1360 in III, all specific heats may be taken as 4.2J/g°C, and radiation is negligible. Condensates leave at condensing temperature. The feed enters at 90°C. Calculate a) the kilograms of 5% liquor that can be concentrated per hour and b) the steam consumption in kilograms per hour
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 triple effect standard vertical tube
evaporator each effect of which has 140 m2
of heating surface is to be used to
concentrate from 5 % solids to 40% solids a
solution possessing a negligible boiling point
elevation. Forward feed is to be used. Steam
is available at 120°C, and the vacuum in the
last effect corresponds to a boiling
temperature of 40°C. The overall coefficients
in W/m2-°C are 2950 in I, 2670 in II and 1360
in II, all specific heats may be taken as
4.2J/g°C, and radiation is negligible.
Condensates leave at condensing
temperature. The feed enters at 90°C.
Calculate a) the kilograms of 5% liquor that
can be concentrated per hour and b) the
steam consumption in kilograms per hour
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