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Q3. An aqueous mixture of solids is to be concentrated with a trippel effect evaporator system. The system is used in forward-feed mode. The feed enters the first effect at a flow rate of 18000 kg/h at 60 °C, with 12 wt% solids content and leaves the third effect with 30 wt% solids content. To heat the first effect steam is sent at 3 bar absolute. The evaporation space above the third effect has a pressure of 0.6 bar absolute. The overall heat transfer coefficents can be assumed as 2220, 2000 and 1500 J/s m² K in the first, second and third effects, respectively. Assumming equal heat transfer in each effect: a) Draw the tripple effect evaporator system in forward-feed mode and label the given quantities. Calculate: b) the flow rate of the product and total amount of vapor evaporated. c) the temperature of each effect.

Q3. An aqueous mixture of solids is to be concentrated with a trippel effect evaporator system. The system is used in forward-feed mode. The feed enters the first effect at a flow rate of 18000 kg/h at 60 °C, with 12 wt% solids content and leaves the third effect with 30 wt% solids content. To heat the first effect steam is sent at 3 bar absolute. The evaporation space above the third effect has a pressure of 0.6 bar absolute. The overall heat transfer coefficents can be assumed as 2220, 2000 and 1500 J/s m² K in the first, second and third effects, respectively. Assumming equal heat transfer in each effect: a) Draw the tripple effect evaporator system in forward-feed mode and label the given quantities. Calculate: b) the flow rate of the product and total amount of vapor evaporated. c) the temperature of each effect.

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
Problem 1.1P
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Q3. An aqueous mixture of solids is to be concentrated with a trippel effect evaporator system. The system is used in forward-feed mode. The feed enters the first effect at a flow rate of 18000 kg/h at 60 °C, with 12 wt% solids content and leaves the third effect with 30 wt% solids content. To heat the first effect steam is sent at 3 bar absolute. The evaporation space above the third effect has a pressure of 0.6 bar absolute. The overall heat transfer coefficents can be assumed as 2220, 2000 and 1500 J/s m² K in the first, second and third effects, respectively. Assumming equal heat transfer in each effect: a) Draw the tripple effect evaporator system in forward-feed mode and label the given quantities. Calculate: b) the flow rate of the product and total amount of vapor evaporated. c) the temperature of each effect. d) the flow rates of steam, and liquid products in each effect and also their solid contents. e) vapor produced in each effect. f) the heat transfer area in each effect needed to accomplish the desired exit concentration. g) the steam economy based upon the results of the first estimate. h) How can you explain the discrepencies between the surface areas calculated, especially the first effect and the mean surface area of the evaporators. How will you estimate the new trial? Write only the procedure to find the area in order to reduce the deviation, step by step.
Transcribed Image Text:Q3. An aqueous mixture of solids is to be concentrated with a trippel effect evaporator system. The system is used in forward-feed mode. The feed enters the first effect at a flow rate of 18000 kg/h at 60 °C, with 12 wt% solids content and leaves the third effect with 30 wt% solids content. To heat the first effect steam is sent at 3 bar absolute. The evaporation space above the third effect has a pressure of 0.6 bar absolute. The overall heat transfer coefficents can be assumed as 2220, 2000 and 1500 J/s m² K in the first, second and third effects, respectively. Assumming equal heat transfer in each effect: a) Draw the tripple effect evaporator system in forward-feed mode and label the given quantities. Calculate: b) the flow rate of the product and total amount of vapor evaporated. c) the temperature of each effect. d) the flow rates of steam, and liquid products in each effect and also their solid contents. e) vapor produced in each effect. f) the heat transfer area in each effect needed to accomplish the desired exit concentration. g) the steam economy based upon the results of the first estimate. h) How can you explain the discrepencies between the surface areas calculated, especially the first effect and the mean surface area of the evaporators. How will you estimate the new trial? Write only the procedure to find the area in order to reduce the deviation, step by step.
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