1. A triple effect evaporator system connected for backward feeding is used to concentrate a solution of non- electrolytes from 8% solids to 40% solids. The feed enters at 21ºC and the last effect is maintained at 50°C. Steam at 250°C and 400 kPa is supplied in the first effect. Cp of all solutions may be assumed constant at 4.18 kJ/kgK. Heat transfer coefficients are 2200, 1900 and 1500 W/m²K in the first, second, third effects respectively. If the feed rate is 2500 kg/hr, find the evaporator areas.
1. A triple effect evaporator system connected for backward feeding is used to concentrate a solution of non- electrolytes from 8% solids to 40% solids. The feed enters at 21ºC and the last effect is maintained at 50°C. Steam at 250°C and 400 kPa is supplied in the first effect. Cp of all solutions may be assumed constant at 4.18 kJ/kgK. Heat transfer coefficients are 2200, 1900 and 1500 W/m²K in the first, second, third effects respectively. If the feed rate is 2500 kg/hr, find the evaporator areas.
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
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Transcribed Image Text:1. A triple effect evaporator system connected for backward feeding is used to concentrate a solution of non- electrolytes
from 8% solids to 40% solids. The feed enters at 21°C and the last effect is maintained at 50°C. Steam at 250°C and 400 kPa
is supplied in the first effect. Cp of all solutions may be assumed constant at 4.18 kJ/kgK. Heat transfer coefficients are 2200,
1900 and 1500 W/m²K in the first, second, third effects respectively. If the feed rate is 2500 kg/hr, find the evaporator areas.
Transcribed Image Text:2. A triple effect evaporator system connected for Mixed Feeding (II-III-I) is used to concentrate a MgCl2 solution from 15%
to 40% solids. The feed enters at 25°C and steam at 180°C. The last effect is maintained at 54°C. Overall heat transfer
coefficient is 3000 in the first effect and 1500 in the second effect and 1000 W/m2K in the last effect. The evaporator area is
50m2. Find the feed rate. Assume Cp constant at 4.4 KJ/kgK for all solutions.
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