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Heat Exchanger Control Systems
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Some Types of Heat Exchangers
Sensible Heat Cooling and Heating Change of Phase Boilers and Condensers Partial Condensing or Partial Vaporization Wiped Film Units for Viscous Fluids
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Basic Model 𝑄=𝑈𝐴Δ𝑇 Simple Heater Loop 𝑄=𝑆𝜆=𝐹 𝑐 𝑃 ( 𝑇 2 − 𝑇 1 )
Actual loop on P&ID Riggs & Karim, Chemical and Bio-Process Control, 2006, p. 12
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Control Loop Options Feedback has some lag time
Feedforward based on steady state process Perry, Chemical Engineers Handbook, 7th Ed., p. 8-17
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Alternate Methods Bypass Control Options
Combined Feedback & FeedForward Marlin, Process Control Designing Processes and Control Systems for Dynamic Performance, 2000, p.784 Riggs & Karim, Chemical and Bio-Process Control, 2006 p. 401
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Physical Installation
Cascade control
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Change of Phase HX Condenser on Distillation Column
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Change of Phase HX Partial Condenser on Distillation Column
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Change of Phase HX Reboiler on Distillation Column
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Condenser Pressure Control
Towler & Sinnott, Chemical Engineering Design Principles, Practice and Economics of Process Design, 2008, p. 279
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Steam Boiler Control Steam Pressure is used to control fuel feed rates
Can be linked to consumer
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Actual Boiler Control Systems
Allow for capacitance in system
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Boiler Drum Level Control
Can use feedback, feedforward & combination Riggs & Karim, Chemical and Bio-Process Control, 2006, p. 12
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Partial Condenser Options
Can control reflux rate William L. Luyben, Alternative Control Structures for Distillation Columns with Partial Condensers, Ind. Eng. Chem. Res. 2004, 43,
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Partial Condenser Options
Can control condenser cooling rate William L. Luyben, Alternative Control Structures for Distillation Columns with Partial Condensers, Ind. Eng. Chem. Res. 2004, 43,
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Partial Condenser Options
Can control reflux ratio William L. Luyben, Alternative Control Structures for Distillation Columns with Partial Condensers, Ind. Eng. Chem. Res. 2004, 43,
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Wiped Film Evaporator Control product feed rate
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