echm 451 chemical engineering process dynamics and control l.
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ECHM 451 Chemical Engineering Process Dynamics and Control. Spring, 2014 REID 104. What is Process Control?. T echniques and technology to control a process. Example: light switch Example: coffee maker This class will focus on automated control. About me…. Office: COBL 310

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Presentation Transcript
what is process control
What is Process Control?
  • Techniques and technology to control a process.
  • Example: light switch
  • Example: coffee maker
  • This class will focus on automated control
about me
About me…
  • Office: COBL 310
  • Phone: 406-994-7902
  • Email: jeff.heys@gmail.com
  • Office hours:
    • Tuesday 11:00am – 12:00pm
    • Thursday 1:00pm – 2:30pm
    • Open office policy, but focus on TTh
about this class
About this class
  • Meet twice per week on Tuesday and Thursday.
  • Scheduled time 9:25-10:40 (typically less)
  • http://www.coe.montana.edu/jeffrey.heys/web451
  • “Typical class”…. Lectures, homework, 2 exams including the final, and a project
  • Lecture capture?
history
History
  • 1995: Ron Larsen took a sabbatical with Dow focused on process control
  • 1996: I took the course from Dr. Larsen the first time he taught it
  • 1996 – 2011: Dr. Larsen refined and improved the course and wrote a textbook along the way.
  • 2011-12: Dr. Larsen promoted to associate provost
slide6
2013
  • I’m teaching this course for the thirdtime (some experience at Stone Container).
  • We will use Dr. Larsen’s book (pick up in main office…$14.50)
  • Read the syllabus and schedule
  • Homework policy (boxes, staple, 1 or 2 per page, etc…)
  • Check your MSU email account frequently
chapter 1
Chapter 1
  • Example #1: Thermostat (On/Off control with set points (SP))
  • Example #2: Cruise control (proportional control)
  • Determining is difficult
slide8
Why?
  • Convenience (and lower labor costs)
  • Safety (many industrial accidents could have been prevented with better process controls)
  • Consistent quality (computers are just better at mundane details)
slide9
Why?
  • Most chemical and biological engineers are not process control experts, but they need to understand the basics!
  • Production engineering: responsible for day-to-day operations. Need to understand process controls to deal with daily issues.
  • Process engineer: longer term view toward continuous process improvement…these improvements often involve new or modified process controls.
specialists
Specialists
  • Some chemical and biological engineers become process control engineers – focus on improving process control systems and implementing standard systems
  • Even fewer become process control specialists – implement solutions for specialized, nonstandard, control situations.
types of process controls
Types of Process Controls
  • Manual control (open loop)
  • On/Off control (closed feedback loop)
  • PID control (chapters 2-9) (closed feedback loop)
  • Dynamic model-based control (closed feedforwardloop)
    • Empirical models (e.g., cold shower)
    • Phenomenological models
this book
This book…
  • Focus is on information needed by process and production engineers (i.e., not specialists)
  • Other books focus on process modeling and Laplace transforms first, and then they discuss PID controls for those processes (and the result are engineers that cannot tune a controller without a model).
larsen vs luyben riggs etc
Larsen vs. Luyben, Riggs, etc.

Traditional

Larsen

Learn about hardware/software (briefly)

Learn basics for analysis of hardware/software

Process Modeling

Convert model to Laplace space

Analysis of hardware/software in Laplace space

  • Process Modeling
  • Convert model to Laplace space
  • Learn about hardware/software (briefly)
  • Analysis of hardware/software in Laplace space
basic control system
Basic Control System
  • Oil heater that uses steam
basic control system15
Basic Control System
  • #1 – we need a sensor (and we cannot measure everything, like entropy or fugacity)
basic control system16
Basic Control System
  • #2 – we need a controller (e.g., PID controller)
basic control system17
Basic Control System
  • #3 – we need something to control (and we cannot control everything like steam T and P)