QUESTION 1 A triple effect forward feed evaporator concentrates a sugar solution from 8 mass % to 35%. The feed enters at 30 000 kg/h at 27°C and the pressure in the vapour space of the third effect is 16 kPa. Fresh saturated steam is available at 205 kPa. The liquid heat capacity is given by Cp = 4.19 - 2.55 x (kJ/kg.K) where x is the mass fraction of sugar. It can be assumed that the BPR's can be neglected. The overall heat transfer coefficients are: U₁ = 3.123; U2 = 1.987 and U3 = 1.136 kW/m².K. Do only one iteration. 1.1. 1.2. 1.3. Draw a flowsheet for this process. ( Determine the flow rates of the vapour and liquid streams for each evaporator. Calculate the Cp's in each effect. List all assumptions. 1.4. Determine the heat balance around each evaporator.
QUESTION 1 A triple effect forward feed evaporator concentrates a sugar solution from 8 mass % to 35%. The feed enters at 30 000 kg/h at 27°C and the pressure in the vapour space of the third effect is 16 kPa. Fresh saturated steam is available at 205 kPa. The liquid heat capacity is given by Cp = 4.19 - 2.55 x (kJ/kg.K) where x is the mass fraction of sugar. It can be assumed that the BPR's can be neglected. The overall heat transfer coefficients are: U₁ = 3.123; U2 = 1.987 and U3 = 1.136 kW/m².K. Do only one iteration. 1.1. 1.2. 1.3. Draw a flowsheet for this process. ( Determine the flow rates of the vapour and liquid streams for each evaporator. Calculate the Cp's in each effect. List all assumptions. 1.4. Determine the heat balance around each evaporator.
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:QUESTION 1
A triple effect forward feed evaporator concentrates a sugar solution from 8 mass %
to 35%. The feed enters at 30 000 kg/h at 27°C and the pressure in the vapour space
of the third effect is 16 kPa. Fresh saturated steam is available at 205 kPa. The liquid
heat capacity is given by Cp = 4.19 - 2.55 x (kJ/kg.K) where x is the mass fraction of
sugar. It can be assumed that the BPR's can be neglected. The overall heat transfer
coefficients are: U₁ = 3.123; U2 = 1.987 and U3 = 1.136 kW/m².K.
Do only one iteration.
1.1.
1.2.
1.3.
Draw a flowsheet for this process.
(
Determine the flow rates of the vapour and liquid streams for each evaporator.
Calculate the Cp's in each effect. List all assumptions.
1.4. Determine the heat balance around each evaporator.
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