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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 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



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




Heat recovery systems l.jpg
HEAT RECOVERY SYSTEMS

  • HEAT RECOVERY FOR A SIMPLE SYSTEM



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





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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