Introduction to PEF3006 Process Control · 2018. 8. 5. · Introduction to PEF3006 Process Control...

Introduction toPEF3006 Process Control

By Finn Aakre Haugen, PhD, Docent([email protected])

105 Aug 2018. PEF3006 Process Control.

USN.

http://usn.no

http://usn.no

205 Aug 2018. PEF3006 Process Control. USN.

Course organization:

• Lectures - in classroom and on video

• Theoretical exercises

• Labs and simulations (compulsory)

- individual and in groups

• Written exam counting 100%

- without aids but with formula list known in advance


USN.

Course contents ...

PID feedback control


USN.

(PID = Proportional + Interal + Derivative)

Demo:

Simulation of a temperature control system of a liquid tank

(This tank may be a biogas reactor.)

http://techteach.no/simview/temp_control_pid_onoff/index.php


Cascade control - several PID loops inside each other


Feedforward control - using measured environmental

variables for control


USN.

MPC (Model-based Predictive Control)

- using simulations into the future to find the optimal

control signal

Timetk tk+1 tk+Ntk+(N-1)

y (predicted by model)

uopt (predicted)

d (assumed)

x(tk) (known from

meas or estimator)

Prediction horizon (N+1 points of time)

Main aim is to calculate

uopt(tk) = uopt(1)= ?

Present

point of

time Future

ysp (known)

Ts

y(tk) (known from

meas or estimator)

d(tk) (known from meas

or estimator or assumed)

x (predicted by model)


Plant-wide control structures

- to control flow, material (inventories or accumulated

amounts of solids, liquid and gas) and temperature in

industrial plants

Nitric acid plant with control system (simplified):

Tank T1

Mixer

M1

Process

water

Reactor

R1

Compressor

K1

NH3

FT

2FFC

1

LC

1

LT

1

PT

1

PC

1

Evaporator

E1

Cold

water

Liquid

Gas

Ammonia

(liquid)

LT

2

LC

2

Condenser C1

LT

3

LC

3

O2

890 oC

NO + H2O

Raw

nitric

acid

HNO3

H2OAbsorber

A1

N2 and NOx

Liquid (acid)

Gas

Shaft 1

Turbine/

generator

TG2

Tail gas

Liquid down

Gas upHeater H1

Air with NOx

FC

3

FT

3

Feed:

Gas

V4

Valve

V1

V2

V3

V5

P1

Manual

setpoint

adjustment

QT

1

NH3

Ammonia

(gas)

Feed:

ST

1

SC

1Air

Turbine/

generator

TG1

Steam

Steam

Steam

drum

D1

Water

Gas

Gas

Specified

Amm./Air

ratio

Liq.

Lab

analysis

Production rate

setpoint

Meas.

rot. speedMULT

kMeas.

air flow

(From bleacher)

NO2

+ H2O

Compressor

K2

Shaft 1


LabVIEW programming for measurement, control and

simulation applications


MATLAB programming

for control system simulation and analysis


K-Spice simulation of industrial plants


Labs: Implementing a simulator and temperature control

system of a laboratory-scale air heater


Theory about control systems:

• Differential equations

• State-space models

• Transfer functions

• Dynamics

• Stability

• Simulation

Introduction to PEF3006 Process Control · 2018. 8. 5. · Introduction to PEF3006 Process Control...

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