Heat Exchanger Control Systems. Some Types of Heat Exchangers Sensible Heat Cooling and Heating...
-
Upload
alonzo-anthony -
Category
Documents
-
view
218 -
download
0
Transcript of Heat Exchanger Control Systems. Some Types of Heat Exchangers Sensible Heat Cooling and Heating...
![Page 1: Heat Exchanger Control Systems. Some Types of Heat Exchangers Sensible Heat Cooling and Heating Change of Phase Boilers and Condensers Partial Condensing.](https://reader035.fdocuments.us/reader035/viewer/2022062511/5517398955034603568b60b3/html5/thumbnails/1.jpg)
Heat Exchanger Control Systems
![Page 2: Heat Exchanger Control Systems. Some Types of Heat Exchangers Sensible Heat Cooling and Heating Change of Phase Boilers and Condensers Partial Condensing.](https://reader035.fdocuments.us/reader035/viewer/2022062511/5517398955034603568b60b3/html5/thumbnails/2.jpg)
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
![Page 3: Heat Exchanger Control Systems. Some Types of Heat Exchangers Sensible Heat Cooling and Heating Change of Phase Boilers and Condensers Partial Condensing.](https://reader035.fdocuments.us/reader035/viewer/2022062511/5517398955034603568b60b3/html5/thumbnails/3.jpg)
Basic Model
• Simple Heater Loop
• Actual loop on P&ID
Riggs & Karim, Chemical and Bio-Process Control, 2006, p. 12
![Page 4: Heat Exchanger Control Systems. Some Types of Heat Exchangers Sensible Heat Cooling and Heating Change of Phase Boilers and Condensers Partial Condensing.](https://reader035.fdocuments.us/reader035/viewer/2022062511/5517398955034603568b60b3/html5/thumbnails/4.jpg)
Control Loop Options
• Feedback has some lag time
• Feedforward based on steady state process
Perry, Chemical Engineers Handbook, 7th Ed., p. 8-17
![Page 5: Heat Exchanger Control Systems. Some Types of Heat Exchangers Sensible Heat Cooling and Heating Change of Phase Boilers and Condensers Partial Condensing.](https://reader035.fdocuments.us/reader035/viewer/2022062511/5517398955034603568b60b3/html5/thumbnails/5.jpg)
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
![Page 6: Heat Exchanger Control Systems. Some Types of Heat Exchangers Sensible Heat Cooling and Heating Change of Phase Boilers and Condensers Partial Condensing.](https://reader035.fdocuments.us/reader035/viewer/2022062511/5517398955034603568b60b3/html5/thumbnails/6.jpg)
Physical Installation • Cascade control
http://www.spiraxsarco.com/resources/steam-engineering-tutorials/control-applications/pressure-control-applications.asp
![Page 7: Heat Exchanger Control Systems. Some Types of Heat Exchangers Sensible Heat Cooling and Heating Change of Phase Boilers and Condensers Partial Condensing.](https://reader035.fdocuments.us/reader035/viewer/2022062511/5517398955034603568b60b3/html5/thumbnails/7.jpg)
Change of Phase HX
• Condenser on Distillation Column
http://eweb.chemeng.ed.ac.uk/courses/control/restricted/course/fourth/course/module3-1.html
![Page 8: Heat Exchanger Control Systems. Some Types of Heat Exchangers Sensible Heat Cooling and Heating Change of Phase Boilers and Condensers Partial Condensing.](https://reader035.fdocuments.us/reader035/viewer/2022062511/5517398955034603568b60b3/html5/thumbnails/8.jpg)
Change of Phase HX
• Partial Condenser on Distillation Column
http://eweb.chemeng.ed.ac.uk/courses/control/restricted/course/fourth/course/module3-1.html
![Page 9: Heat Exchanger Control Systems. Some Types of Heat Exchangers Sensible Heat Cooling and Heating Change of Phase Boilers and Condensers Partial Condensing.](https://reader035.fdocuments.us/reader035/viewer/2022062511/5517398955034603568b60b3/html5/thumbnails/9.jpg)
Change of Phase HX
• Reboiler on Distillation Column
http://eweb.chemeng.ed.ac.uk/courses/control/restricted/course/answers/fourth/answer2.html
![Page 10: Heat Exchanger Control Systems. Some Types of Heat Exchangers Sensible Heat Cooling and Heating Change of Phase Boilers and Condensers Partial Condensing.](https://reader035.fdocuments.us/reader035/viewer/2022062511/5517398955034603568b60b3/html5/thumbnails/10.jpg)
Condenser Pressure ControlTowler & Sinnott, Chemical Engineering Design Principles, Practice and Economics of Process Design, 2008, p. 279
![Page 11: Heat Exchanger Control Systems. Some Types of Heat Exchangers Sensible Heat Cooling and Heating Change of Phase Boilers and Condensers Partial Condensing.](https://reader035.fdocuments.us/reader035/viewer/2022062511/5517398955034603568b60b3/html5/thumbnails/11.jpg)
Steam Boiler Control
• Steam Pressure is used to control fuel feed rates
• Can be linked to consumer
http://www.powermag.com/issues/features/Drum-pressure-the-key-to-managing-boiler-stored-energy_300.html
![Page 12: Heat Exchanger Control Systems. Some Types of Heat Exchangers Sensible Heat Cooling and Heating Change of Phase Boilers and Condensers Partial Condensing.](https://reader035.fdocuments.us/reader035/viewer/2022062511/5517398955034603568b60b3/html5/thumbnails/12.jpg)
Actual Boiler Control Systems
• Allow for capacitance in system
http://www.powermag.com/issues/features/Drum-pressure-the-key-to-managing-boiler-stored-energy_300.html
![Page 13: Heat Exchanger Control Systems. Some Types of Heat Exchangers Sensible Heat Cooling and Heating Change of Phase Boilers and Condensers Partial Condensing.](https://reader035.fdocuments.us/reader035/viewer/2022062511/5517398955034603568b60b3/html5/thumbnails/13.jpg)
Boiler Drum Level Control
• Can use feedback, feedforward & combination
Riggs & Karim, Chemical and Bio-Process Control, 2006, p. 12
![Page 14: Heat Exchanger Control Systems. Some Types of Heat Exchangers Sensible Heat Cooling and Heating Change of Phase Boilers and Condensers Partial Condensing.](https://reader035.fdocuments.us/reader035/viewer/2022062511/5517398955034603568b60b3/html5/thumbnails/14.jpg)
Partial Condenser Options
• Can control reflux rate
William L. Luyben, Alternative Control Structures for Distillation Columns with PartialCondensers, Ind. Eng. Chem. Res. 2004, 43, 6416-6429
![Page 15: Heat Exchanger Control Systems. Some Types of Heat Exchangers Sensible Heat Cooling and Heating Change of Phase Boilers and Condensers Partial Condensing.](https://reader035.fdocuments.us/reader035/viewer/2022062511/5517398955034603568b60b3/html5/thumbnails/15.jpg)
Partial Condenser Options
• Can control condenser cooling rate
William L. Luyben, Alternative Control Structures for Distillation Columns with PartialCondensers, Ind. Eng. Chem. Res. 2004, 43, 6416-6429
![Page 16: Heat Exchanger Control Systems. Some Types of Heat Exchangers Sensible Heat Cooling and Heating Change of Phase Boilers and Condensers Partial Condensing.](https://reader035.fdocuments.us/reader035/viewer/2022062511/5517398955034603568b60b3/html5/thumbnails/16.jpg)
Partial Condenser Options
• Can control reflux ratio
William L. Luyben, Alternative Control Structures for Distillation Columns with PartialCondensers, Ind. Eng. Chem. Res. 2004, 43, 6416-6429
![Page 17: Heat Exchanger Control Systems. Some Types of Heat Exchangers Sensible Heat Cooling and Heating Change of Phase Boilers and Condensers Partial Condensing.](https://reader035.fdocuments.us/reader035/viewer/2022062511/5517398955034603568b60b3/html5/thumbnails/17.jpg)
Wiped Film Evaporator• Control product feed rate
http://www.artisanind.com/ps/docs/rototherm.pdf