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Control for Aluminum Production and Other Processing Industries
book

Control for Aluminum Production and Other Processing Industries

by Mark P. Taylor, John J. Chen, Brent Richmond Young
October 2013
Intermediate to advanced content levelIntermediate to advanced
252 pages
8h 17m
English
CRC Press
Content preview from Control for Aluminum Production and Other Processing Industries
30 Control for Aluminum Production
On the whiteboard Barry was doing heat transfer 101 for them:
Q = U A ΔT
LMTD
where
Q = Heat duty to achieve target temperatures, either to the dry aggregate,
pitch, or the paste, kW.
A = Heat exchange surface area, which can become fouled by burned pitch,
paste, or deposits from HTF, thereby increasing its resistance to heat
transfer signicantly.
U = The overall heat transfer coefcient, which includes any ‘fouled’
surfaces.
ΔT
LMTD
= Log mean temperature difference between the HTF and either the
aggregate, paste, or pitch. If U decreases over time, this temperature
difference must increase in order to transfer Q, in order to meet
thetarget temperatures.
Now Barry was leaning over the drawings and pointing. “ ...
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Publisher Resources

ISBN: 9781466514690