Performing Process Control Experiments Across the Atlantic Anders - - PowerPoint PPT Presentation

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Performing Process Control Experiments Across the Atlantic Anders - - PowerPoint PPT Presentation

Jan 03, 2023 204 likes •523 views

Performing Process Control Experiments Across the Atlantic Anders Selmer Department of Chemical Engineering University of Cambridge Background Dr Markus Kraft, CU Prof Clark Colton, MIT To explore the use of Internet accessible

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Performing Process Control Experiments Across the Atlantic

Anders Selmer Department of Chemical Engineering University of Cambridge

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Background

Prof Clark Colton, MIT Dr Markus Kraft, CU

“To explore the use of Internet accessible laboratory experiment in the chemical engineering curriculum”

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Why?

Why do I like the idea?

  • Possibilities of the Internet
  • Remote operation
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Why2

Why is this a good idea at the University of Cambridge?

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MIT iLabs Heat Exchanger

  • Heat Transfer
  • Process Control
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Chem Eng in Cambridge

M.Eng. (Chemical Engineering)

  • 1st year either NST1, EGT1 CST1
  • then 3 years of chemical engineering
  • ~ 30-40 students in each of 3 years
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3rd year Chem Eng Part IIA

  • Lectures

– Fundamentals – more thermodynamics, more fluid mechanics – Process operations – reactors, separators, bioprocessing – Process systems – dynamics and control, process logistics, safety & environment – Enabling topics – optimisation, statistics, corrosion & materials

  • Assessed exercises
  • Major Design Project in Easter Term
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Exercises

  • Extended activity
  • Test of knowledge
  • Challenge
  • Report
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New Exercise

  • New exercise in Process Dynamics and

Control

  • Replaced a pen and paper exercise
  • Experimental part on MIT iLabs Heat

Exchanger

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Assignment

  • A few preparatory questions on control
  • An experimental session on a real

system

  • Processing of data and discussion of

results

  • Feedback
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  • 1. Preparation
  • Identify parameters
  • Open Loop Data
  • Cohen-Coon
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  • 2. Experimental

session

  • Log in
  • P, PI and PID observation
  • Fine tuning
  • Alter settings and record responses
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Interface

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Chat

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  • 3. Processing
  • Worst disturbance
  • Error responses
  • Suggest further tuning
  • Compare to idealized system
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  • 4. Evaluation
  • No technical problems
  • Questionnaires
  • Likert scale, 1 - 7
  • 23 questionnaires from 36 students
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Usability

I had no problem s operating the experim ent on the w eb

2 4 6 8 10 12 1 2 3 4 5 6 7

disagree agree Num ber of students

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Student Quotes

“The interface was plain and simple - very easy to operate and the use of the chat window was also very helpful” “Interface was clear and easy to use. Instructions good” “Quite user friendly system. Good instruction etc available”

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Group Work

I w as able to m ake a significant contribution to m y group's experim ent

2 4 6 8 10 12 14 1 2 3 4 5 6 7

disagree agree Num ber of students

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Group Work

I w ould have benefited from being in a sm aller group

2 4 6 8 10 12 1 2 3 4 5 6 7

disagree agree Num ber of students

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Student Quotes

“No problem - useful to be able to discuss things” “Beneficial having a group of people to discuss/ explain ideas” “Very useful to have people to talk it through with”

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Educational

The rem otely controlled experim ent provided an experience of qualitative behavior of P, PI and PI D control

2 4 6 8 10 12 1 2 3 4 5 6 7

disagree agree Num ber of students

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Comparison

The I -lab heat exchanger w as a beneficial learning experience

(compared to other exercises)

2 4 6 8 10 12 1 2 3 4 5 6 7

disagree agree Num ber of students

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Student Quotes

“Useful to experience a system that is close to reality than ideal systems studied in lectures” “More hands on. I had control of a real experiment and was able to see the responses to adjustments I made, in real time” “Good to obtain and analyze real data, not just theoretical exercises”

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Summary

  • Control experiment performed across the

Atlantic

  • Technology available and stable
  • Appreciated by students
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Current Work

  • Chemical reactors
  • Collaboration with Siemens
  • Industrial experience
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Setup

Tc Spectro- photometer Heater Injector Storage Tank Storage Tank Storage Tank Pump Pump Pump Pump Reactor Stirrer Inflow Outflow

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Setup

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Assignment

  • Determine reaction constants etc based on supplied batch

data

  • Use these to estimate reaction time needed for desired

conversion based on ideal reactor model

  • Derive equations for non-ideal reactor model
  • Perform residence time experiment to estimate level of

non-ideality for the experimental setup

  • Use this data and derived equations to estimate reaction

time needed for desired conversion for the setup

  • Perform kinetics experiment based on ideal and non-ideal

reaction time and compare to what was predicted using the ideal/ non-ideal model

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Siemens

I/O racks I/O racks Field Transmitters Field Transmitters Profibus Profibus Fast Ethernet Fast Ethernet SIMATIC S7 400 Automation Controllers SIMATIC S7 400 Automation Controllers Standard Ethernet Standard Ethernet Operator Station Operator Station Server Server Operator Stations Operator Stations Engineering Station Engineering Station

Experiment

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Thank You

  • The Cambridge-MIT Institute (CMI)
  • MIT iLabs (part of iCampus)
  • Siemens Automation and Drives

Cooperates with Education (SCE)