A steam-heated evaporator used to concentrate a feed stream by evaporating water is shown in Fig. E8.14.

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A steam-heated evaporator used to concentrate a feed stream by evaporating water is shown in Fig. E8.14. The mass

Overhead D, xp = 0 Pressure Steam, S Feed xF, F Condensate, S AC Хт AT Product х, В Figure E8.14

fraction of solute in the exit stream x is measured and controlled by adjusting the steam flow rate, S. The control valve is fail-open. Should the composition controller be direct-acting?

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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 03, 2018 01:56 PM

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A steam-heated evaporator used to concentrate a feed stream by evaporating water is shown in Fig. E8.14.

Question:

Overhead D, xp = 0 Pressure Steam, S Feed xF, F Condensate, S AC Хт AT Product х, В Figure E8.14

Step by Step Answer:

First consider qualitatively how solute mass fraction x responds to a change in steam flow rate S ...View the full answer

Process Dynamics and Control

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