Consider the evaporator and control system in Figure 13.6. (a) Should each control valve be air-to-open (AO)

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Consider the evaporator and control system in Figure 13.6.
(a) Should each control valve be air-to-open (AO) or air-to-close (AC)?
(b) Should each PI controller be direct-acting or reverse-acting?

(I/P PC Solvent D, xD PT I/P P, T, p (LT P AC Steam LC I/P AT Feed F, *, xf, Tp Product В, Хв Figure 13.6 Evaporator

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Process Dynamics and Control

ISBN: 978-1119385561

4th edition

Authors: Dale E. Seborg, Thomas F. Edgar, Duncan A. Mellichamp, Francis J. Doyle

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Question Posted: Aug 04, 2018 12:02 PM

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Consider the evaporator and control system in Figure 13.6. (a) Should each control valve be air-to-open (AO)

Question:

(I/P PC Solvent D, xD PT I/P P, T, p (LT P AC Steam LC I/P AT Feed F, *, xf, Tp Product В, Хв Figure 13.6 Evaporator control strategy for Case (a). ---- KD-

Step by Step Answer:

a There are three control valves The selection of airtoclose vs airtoopen is based on safety conside...View the full answer

Process Dynamics and Control

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