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What is the most economical number of effects to use in the recovery of black liquor in a paper plant if the following cost data are available? The annual fixed costs increase essentially linearly with each effect (except for condensing, feeding, and other equipment costs for multiple units which may be considered to balance each other). If a fixed amount of evaporation is to be obtained and each unit is to have 1,000 ft of heating surface with a service life of 5 years, the annual fixed costs CF would be (100006 (2500ON ouo) dollars per year, where N is the number of effects. Because of the steam economy in S000. multiple-effect operation, the direct costs for steam and the total of all annual direct costs, Co, has been established for this type of operation as 05,000N0. dollars.

What is the most economical number of effects to use in the recovery of black liquor in a paper plant if the following cost data are available? The annual fixed costs increase essentially linearly with each effect (except for condensing, feeding, and other equipment costs for multiple units which may be considered to balance each other). If a fixed amount of evaporation is to be obtained and each unit is to have 1,000 ft of heating surface with a service life of 5 years, the annual fixed costs CF would be (100006 (2500ON ouo) dollars per year, where N is the number of effects. Because of the steam economy in S000. multiple-effect operation, the direct costs for steam and the total of all annual direct costs, Co, has been established for this type of operation as 05,000N0. dollars.

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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What is the most economical number of effects to use in the recovery of black liquor in a paper plant if the following cost data are available? The annual fixed costs increase essentially linearly with each effect (except for condensing, feeding, and other equipment costs for multiple units which may be considered to balance each other). If a fixed amount of evaporation is to be obtained and each unit is to have 1,000 ft of heating surface with a service life of 5 years, the annual fixed costs CF would be 0.6 O0 (s00o) dollars per year, where N is the number of effects. Because of the steam economy in 5000 multiple-effect operation, the direct costs for steam and the total of all annual direct costs, Co, has been established for this type of operation as 65,000N9 dollars. A. 3 В. 4 С. 5 D. 6
Transcribed Image Text:What is the most economical number of effects to use in the recovery of black liquor in a paper plant if the following cost data are available? The annual fixed costs increase essentially linearly with each effect (except for condensing, feeding, and other equipment costs for multiple units which may be considered to balance each other). If a fixed amount of evaporation is to be obtained and each unit is to have 1,000 ft of heating surface with a service life of 5 years, the annual fixed costs CF would be 0.6 O0 (s00o) dollars per year, where N is the number of effects. Because of the steam economy in 5000 multiple-effect operation, the direct costs for steam and the total of all annual direct costs, Co, has been established for this type of operation as 65,000N9 dollars. A. 3 В. 4 С. 5 D. 6
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