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Evolving a Control System - supplement to “Process Monitoring and Control”. 3 rd year Design Module. Elements of a “Control Loop”. Measure, Control, Manipulate. Control. FC. Measure. Manipulate. Common Control Schemes. FC. PC. PC. Flow Control. Downstream Pressure Control.

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evolving a control system supplement to process monitoring and control

Evolving a Control System- supplement to “Process Monitoring and Control”

3rd year Design Module

elements of a control loop
Elements of a “Control Loop”
  • Measure, Control, Manipulate

Control

FC

Measure

Manipulate

common control schemes
Common Control Schemes

FC

PC

PC

Flow Control

Downstream

Pressure Control

Upstream

Pressure Control

LC

TC

LC

Temperature Control

Level Control (inlet)

Level Control (outlet)

first the overall process
First - The Overall Process
  • Look at the overall process mass balance Control first
    • Every process needs something that ‘controls’ the flow rate through it
    • Every process needs something to ‘control’ the inventory in it
      • Inventory is Pressure for gasses, Liquid Level for liquids

FC

overall process
Overall Process

PC

PC

Method 1: Control it’s flow in & “hold” it back with pressure or level

Mass Balance

FC

Separation 2

Reactors

Separation

  • Things to consider:- Notice recycles don’t change inventory!
  • A rearrangement of these is possible/desirable (depends on feed stream)
  • This is a ‘”degree of freedom” analysis

Regneration

look at the individual equipment
Look at the individual equipment
  • Heat exchangers need something to control temperature

TC

Temperature Control

look at the individual equipment1
Look at the individual equipment
  • Separators need something to control Liquid Level and possibly pressure

LC

LC

Level Control (inlet)

Level Control (outlet)

Choose based on whether feed into the tank is being ‘controlled’ by an upstream process or not.

look at the individual equipment2
Look at the individual equipment

PC

  • Separators need something to control Liquid Level and possibly pressure

LC

degrees of freedom
Degrees of Freedom
  • Aka Dueling Control
    • You can only control the flow once in a system that requires/implies conservation of mass

This Doesn’t work !!

The Controllers Duel for control over the Flow

FC

FC

slide10

PC

PC

PC

PC

  • This Doesn’t work

This works !

slide11

SAMPLE

FC

TC

LC

what to submit
What to submit
  • An electronic PFD
    • Setup to print your PFD to the PDF Creator on the cluster computers – File, Printer Setup, Graphic Printer, Choose the PDF Creator
    • Print the Process Flow Diagram (to the PDF Creator)
    • Use Acrobat “snapshot tool” (camera icon) to copy and paste the PFD into Powerpoint
    • Drag and drop the symbols from this file onto you powerpoint slide