| Tower Sizing and Pricing |
Tower Sizing and Pricing
The program that I have posted
on this page can be used to perform preliminay size and cost estimates for
distillation columns with internal trays. It is in Microsoft Excel format
(version 5.0 or greater) and runs as an Excel Add-In. The program assumes
cooling water (water entering at 300C and leaving no higher than 450C)
is used in the condenser. LPS (Low Pressure Steam) is assumed to be at 5 barg
and 1600C, MPS (Medium Pressure Steam) at 10 barg and 1840C,
and HPS (High Pressure Steam) at 41 barg and 2540C. Here are some
other details of the this EXCEL ADD-IN:
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The condenser is priced as a Fixed
Head Exchanger
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The reboiler is priced as a
Floating Head Exchanger
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Minimal inputs are required for
the column sizing and pricing
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Returned values include the cost
of the vessel, trays, reboiler, condenser, steam, cooling water, and a
local Net Present Value (over 10 years at an interest rate of 10%) for
the column operation. This value can be used for optimization
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Utility prices used are: LPS
$3.17/GJ, MPS $3.66/GJ, HPS $5.09/GJ, and CW $0.16/GJ
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The equipment is prices using
correlations developed by G. D. Ulrich in A Guide to Chemical
Engineering Process Design and Economics, Wiley, New York 1984.
These correlations have also been reprinted in Analysis, Synthesis,
and Design of Chemical Processes by Richard Turton, Richard Baile,
Wallace Whiting, and Joseph Shaeiwitz (Prentice Hall, 1998). These
correlations are well developed and provide a good degree of accuracy
for a preliminary design.
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Length and diameter of column is
also estimated
If you have any other questions
concerning this program or would like to report a bug, please let me know.
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