lecture1-_part1

8/8/2019 lecture1-_part1

1/40

1


2/40

2

SEI 4 14 3 :

COM P UTER P ROCESS CON TROL

Lecturer: Dr. Norhaliza Abdul Wahab

E-mail: [email protected]

Extension: 35418

Room: P06-214


3/40

3

ObjectiveTo introduce students to the theories and concepts ofcomputer control in process industries.

SynopsisThis course provides an introduction to the use ofcomputer for the control of industrial processes andequipments. It also provides an introduction to the

principle of modeling process systems and to the

practice of process control.


4/40

4

Course outcomes:At the end of the course the students should be able to:CO1 Describe the basic principles of computer control inprocess industries.

CO2 Identify and use standards, symbols and diagramscommonly used in process control systems.CO3 Apply computational aids such as MATLAB for theanalysis and design of process control systems.CO4 Design a system, component or controller to meetprocess control objectives.CO5 Be able to work in a team and communicate

effectively.


5/40


6/40

6

PO1 PO2 PO3 PO4 PO5 PO6 PO7 PO8 PO9 PO10

CO1 1,a

CO2 1,a

CO3 1,b 1,b 2,b

CO4 1,a

CO5 3,b 3,b

Mapping of CO to PO1-P10, emphasis and assessment method

1 = strong emphasis, 2 = medium emphasis, 3 = low emphasis

a = examinations, tests, quizzes; b = assignment, report; c= presentation,

laboratory, seminar; d=thesis; e=site visit


7/40

7

Evaluation

Test 20% (Week 14)Group Assignment 30% (Due to be confirmed later)Final exam 50% (Examination period)

Class Schedule

Monday, 0900-1050 (P16- Demo 2)Wednesday, 1000-1050 (P16- Demo 2)

Website: http://elearning.utm.my/


8/40

8

Textbook:

T. Marlin, Process Control: Designing Processes and Control Systems forDynamic Performance, 2nd Edition, McGraw-Hill, New York, 2000.


9/40

9

Please make sure that:

UTM dress code is complied at all times.

Activities that can disturb the lecture are avoided

(making noise, answering phone, etc.).

Full attention is given to the lecture.

Any non-compliances may result in

you having to leave the lecturetheater/examination hall.


10/40

10

Examples of non-compliances:

Wearing slippers.

Wearing collarless T-shirt.

Long hair (male students).

Tight clothing, short skirts, revealing or transparentclothes.

Not wearing university identification card.

Copying/plagiarism.


11/40

11


12/40

12

FEEDBACK CONTROL

TC

v1

v2

Tin

0 10 20 30 40 50 60-2

0

2

4

6

8

Time

ControlledVariable

0 10 20 30 40 50 60

-15

-10

-5

0

5

TimeM

anipulatedVariable

IAE = 88

Why am I takingthis course?

I dont want tobe a P.C.

specialist.

Is this part of

electricalengineering?

Now for 25 more interesting points,

bla, bla, bla, ..

How can I

survive SEI4143?


13/40

13


14/40

14


15/40

15


16/40

16

Manipulated Variable.


17/40

17


18/40

18


19/40

19

Feed

Methane

Ethane (LK)

Propane

ButanePentane

Vapor

product

Liquid

productProcess

fluidSteam

WHY IS PROCESS CONTROL IMPORTANT?

You built it as designed and .

You lost $100,000 per week; no one

would buy your product. .

Also, it polluted Pasir Gudang

Then, the pump was damaged $$$.

What was missing ?????

Then, an explosion killed 2 workers


20/40

20


Feed

MethaneEthane (LK)Propane

ButanePentane

Vapor

product

Liquid

productProcessfluid

Steam

F1

F2 F3

T1 T2

T3

T5

T4

T6 P1

L1

A1

L. Key

We need to be able

to drive theprocess

valves

sensors


21/40

21


Feed


ButanePentane

Vapor

product

Liquid

productProcessfluid

Steam

F1

F2 F3

T1 T2

T3

T5

T4

T6 P1

L1

A1

L. Key

We need to be able

to drive theprocess

We need an active

element that usesmeasurements to

influence the process


22/40

22


Feed


ButanePentane

Vapor

product

Liquid

productProcessfluid

Steam

F1

F2 F3

T1 T2

T3

T5

T4

T6 P1

L1

A1

L. Key

We need to be able

to drive theprocess

We need an active

element that usesmeasurements toinfluence the process.

This can be automated


23/40

23


24/40

24


25/40

25


26/40

26

Appendix A


27/40

27

Example (Heat exchanger).


28/40

28

Appendix A


29/40

29

Appendix A


30/40

30

Appendix A


31/40

31

Appendix A


32/40

32

Appendix A


33/40

33

Appendix A

A control valve whichshould go to the openposition on control signal

failure.


34/40

34

Fail open or Failclose?


35/40

35


36/40

36

Examples:

1.1. Drawing symbols: Determine all letters that would beused to designate each of the following instruments onprocess and instrumentation (P&I) drawings.

i) Liquid level alarm high,

ii) Pressure indicator,

iii) Temperature indicator in a packed bed,

iv) Volume flow rate of butane in a pipe,

Examples:

1.1. Drawing symbols: Determine all letters that would beused to designate each of the following instruments onprocess and instrumentation (P&I) drawings.

i) Liquid level alarm high, (LAH)

ii) Pressure indicator, (PI)

iii) Temperature indicator in a packed bed, (TI)

iv) Volume flow rate of butane in a pipe, (FI)


37/40

37

A Chemical Engineering Example: A chemical reactor with recycle is depictedin textbook Figure 1.8 and repeated below.a. Can T4, the reactor feed temperature be controlled by feedback? Hint:determine which valves have a causal effect on T4.b. Select the best valve to control T4 if more than one valves are possible.

Yes, strong


38/40

38


39/40

39

Exercise 1.6 : For the process shown, the key variables tobe controlled are input flow rate, temperature,composition and pressure.

a) Determine which sensors and final elements arerequired so that the important variables can becontrolled. Sketch them on the figure where theyshould be located.

b) Select controller pairings; that is, select which

measured variable should be controlled by adjustingwhich manipulated variable.


40/40

40

Drum

Heat Exchangers

Pump

Liquid

Vapor

Variables to becontrolled areinput flow rate,temperature,compostion andpressure.

FC

TC

Documents

lecture1-_part1