A triple effect forward feed evaporator is being used to remove water in an aqueous NaOH. The temperature of feed solution is 15.56 degrees Celsius. The engineer is determined to achieve 50% weight per weight of NaOH from a 5% weight per weight of original solution. The steam pressure value is 9.1862 atm with ejectors able to maintain a pressure of 1 psia which is planned to be use. It is assumed that the 3 evaporators have constant heating area and large enough to make a 2.52 kg/s of thick liquor. The values for the overall heat transfer coefficients in Btu/hr-ft^2-degree F are: 800, 500, and 300, respectively. Solve for the heating area/surface in each effect (assume equal sizes), steam consumption, and the steam economy. Also, draw process flow diagram.
A triple effect forward feed evaporator is being used to remove water in an aqueous NaOH. The temperature of feed solution is 15.56 degrees Celsius. The engineer is determined to achieve 50% weight per weight of NaOH from a 5% weight per weight of original solution. The steam pressure value is 9.1862 atm with ejectors able to maintain a pressure of 1 psia which is planned to be use. It is assumed that the 3 evaporators have constant heating area and large enough to make a 2.52 kg/s of thick liquor. The values for the overall heat transfer coefficients in Btu/hr-ft^2-degree F are: 800, 500, and 300, respectively. Solve for the heating area/surface in each effect (assume equal sizes), steam consumption, and the steam economy. Also, draw process flow diagram.
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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A triple effect forward feed evaporator is being used to remove water in an aqueous NaOH. The temperature of feed solution is 15.56 degrees Celsius. The engineer is determined to achieve 50% weight per weight of NaOH from a 5% weight per weight of original solution. The steam pressure value is 9.1862 atm with ejectors able to maintain a pressure of 1 psia which is planned to be use. It is assumed that the 3 evaporators have constant heating area and large enough to make a 2.52 kg/s of thick liquor. The values for the overall heat transfer coefficients in Btu/hr-ft^2-degree F are: 800, 500, and 300, respectively.
Solve for the heating area/surface in each effect (assume equal sizes), steam consumption, and the steam economy. Also, draw process flow diagram.
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