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CONTROL FOR HEAT EXCHANGE. M. B. JENNINGS CHE 185 FEB 2006. OUTLINE. EXCHANGER DESIGN CONCEPTS GENERAL CONTROL CONFIGURATION SPECIFIC TYPES OF PROCESSES HEAT RECOVERY REACTORS DISTILLATION COLUMNS. SINGLE HEAT EXCHANGERS. SHELL & TUBE EXCHANGERS

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CONTROL FOR HEAT EXCHANGE

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Control for heat exchange l.jpg

CONTROL FOR HEAT EXCHANGE

M. B. JENNINGS

CHE 185

FEB 2006


Outline l.jpg

OUTLINE

  • EXCHANGER DESIGN CONCEPTS

  • GENERAL CONTROL CONFIGURATION

  • SPECIFIC TYPES OF PROCESSES

    • HEAT RECOVERY

    • REACTORS

    • DISTILLATION COLUMNS


Single heat exchangers l.jpg

SINGLE HEAT EXCHANGERS

  • SHELL & TUBE EXCHANGERS

  • USED FOR SINGLE PHASE OR TWO PHASE FLOWS

  • From: http://www.me.wustl.edu/ME/labs/thermal/me372b5.htm


Exchanger flow patterns l.jpg

EXCHANGER FLOW PATTERNS

  • COCURRENT OR COUNTERCURRENT


Multipass exhangers l.jpg

MULTIPASS EXHANGERS

  • 1 SHELL- 2 TUBE PASS EXCHANGER

  • COMBINED COUNTERCURRENT AND COCURRENT FLOW


Correction factors for multipass exchangers l.jpg

CORRECTION FACTORS FOR MULTIPASS EXCHANGERS


Heat exchange limits l.jpg

HEAT EXCHANGE LIMITS

  • FOR PURE COUNTERCURRENT FLOWS

  • TEMPERATURE CROSSES ARE NOT POSSIBLE WITH MULTIPASS EXCHANGERS


Basic control schemes for single exchangers 1 l.jpg

BASIC CONTROL SCHEMESFOR SINGLE EXCHANGERS -1

FLUID TEMPERING EXCHANGER WITH FEEDBACK CONTROL


Basic control schemes for single exchangers 2 l.jpg

BASIC CONTROL SCHEMESFOR SINGLE EXCHANGERS - 2

FLUID TEMPERING EXCHANGER WITH FEEDBACK AND FEEDFORWARD CONTROL


General block flow diagram for control loop l.jpg

GENERAL BLOCK FLOW DIAGRAM FOR CONTROL LOOP


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SPECIFIC BLOCK FLOW DIAGRAM


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HEAT RECOVERY SYSTEMS

  • HEAT RECOVERY FOR A SIMPLE SYSTEM


Heat recovery with feedback feedforward options l.jpg

HEAT RECOVERY WITH FEEDBACK & FEEDFORWARD OPTIONS


Reactor temperature control with jacket 1 l.jpg

REACTOR TEMPERATURE CONTROL WITH JACKET - 1

  • FEEDBACK CONTROL BASED ON PRODUCT TEMPERATURE


Reactor temperature control with jacket 2 l.jpg

REACTOR TEMPERATURE CONTROL WITH JACKET - 2

  • FEEDFORWARD CONTROL BASED ON JACKET COOLANT INLET TEMPERATURE


Reactor temperature control external exchanger l.jpg

REACTOR TEMPERATURE CONTROL - EXTERNAL EXCHANGER


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DISTILLATION CONTROL - CONDENSER


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DISTILLATION CONTROL - REBOILER


Conclusions l.jpg

CONCLUSIONS

  • A FEW TYPES OF CONTROL CONFIGURATIONS CAN BE APPLIED TO A WIDE RANGE OF HEAT EXCHANGE PROCESSES

  • SPECIFIC TYPES OF UNIT OPERATIONS MAY BE ABLE TO USE MORE COMPLEX HEAT EXCHANGE CONTROL


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