Slurry of liquor encompassing 15 per cent of solid particles is concentrated to 55 per cent solids in multiple effect evaporator (2 effect) operating at a pressure of 18 kN/m in the second effect. At a temperature of 375 K, the feed rate is 2.5 kg/s with a specific heat capacity of 3.75 kJ/kg K. The pressure of the steam fed to the first effect is 240 kN/m² and the boiling-point rise of the concentrated liquor is 6 deg K. The first and second effects have overall heat transfer coefficients of 1.8 and 0.63 kW/m K, respectively. If the heat transfer area is to be the same in each effect, what areas should be specified? You can use a Steam Table Hint: a heat balance around each effect: 1) Dodo = Gf×C,(T1 - Tf) + Dị1 First effect 2) DiA1 + (GF – D1)×Cp(T1 – T'2) = D2^2 Second effect
Slurry of liquor encompassing 15 per cent of solid particles is concentrated to 55 per cent solids in multiple effect evaporator (2 effect) operating at a pressure of 18 kN/m in the second effect. At a temperature of 375 K, the feed rate is 2.5 kg/s with a specific heat capacity of 3.75 kJ/kg K. The pressure of the steam fed to the first effect is 240 kN/m² and the boiling-point rise of the concentrated liquor is 6 deg K. The first and second effects have overall heat transfer coefficients of 1.8 and 0.63 kW/m K, respectively. If the heat transfer area is to be the same in each effect, what areas should be specified? You can use a Steam Table Hint: a heat balance around each effect: 1) Dodo = Gf×C,(T1 - Tf) + Dị1 First effect 2) DiA1 + (GF – D1)×Cp(T1 – T'2) = D2^2 Second effect
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:Slurry of liquor encompassing 15 per cent of solid particles is concentrated to 55
per cent solids in multiple effect evaporator (2 effect) operating at a pressure of 18
kN/m in the second effect. At a temperature of 375 K, the feed rate is 2.5 kg/s
with a specific heat capacity of 3.75 kJ/kg K. The pressure of the steam fed to the
first effect is 240 kN/m and the boiling-point rise of the concentrated liquor is 6
deg K. The first and second effects have overall heat transfer coefficients of 1.8
and 0.63 kW/m' K, respectively. If the heat transfer area is to be the same in each
effect, what areas should be specified? You can use a Steam Table
Hint: a heat balance around each effect:
1) Doro = GFXCP(T1- Tf)+ DịA1 First effect
2) Dik1 + (GF - D1)×Cp(T1 - T2) = D2A2 Second effect
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