© The Institution of Electrical Engineers
The paper reports on a collaborative, university/industry project to investigate the contribution which modern control technology can make to a difficult industrial problem: pH control. A digital computer was interfaced for online neutralisation of effluent from a full-scale production process. The investigation consisted of trials, some of them extended, using the computer to control neutralisation according to various algorithms and to monitor performance, and of simulation studies. Algorithms investigated include p.i.d., self-tuning control, and optimal-k-step-ahead (o.k.) adaptive control. The paper summarises work to date which leads to the conclusion that an online digital computer can contribute substantially to pH control and that o.k. control is a promising candidate for general-purpose feedback within a configuration of combined feedbadk, feeciforwardancilineansation
References
-
-
1)
-
P.D. Roberts
.
Nonlinear control of a neutralisation process.
Meas. & Control
,
151 -
157
-
2)
-
Hewkin, P.F.: `The control of pH using modern algorithms and online computers', 1979, D. Phil. thesis, University of Oxford.
-
3)
-
K.J. Astrom ,
B. Wittenmark
.
On self-tuning regulators.
Automatica
,
185 -
199
-
4)
-
D.W. Clarke ,
P.J. Gawthrop
.
Self-tuning control.
Proc. IEE
,
6 ,
633 -
640
-
5)
-
B. Wittenmark
.
Stochastic adaptive control methods:survey.
Int. J. Control
,
705 -
730
-
6)
-
O.L.R. Jacobs ,
J.W. Patchell
.
Caution and probing in stochastic control.
Int. J. Control
,
189 -
199
-
7)
-
E. Wolfender ,
T. Beyerle ,
M. Alt
.
Kontinuierliche Abwasserneutralisation mittels eines Kleinprozessrechners.
Regelungstechnische Praxis
,
116 -
120
-
8)
-
Jacobs, O.L.R., Hughes, D.J.: `Simultaneous identification and control using a neutral control law', paper 30.2, Presented at the 6th IFAC congress, August 1975, Boston.
-
9)
-
O.L.R. Jacobs ,
P. Saratchandran
.
Comparison of adaptive controllers.
Automatica
,
89 -
97
-
10)
-
A.A. Iverson ,
S. Ochias
.
Controlling effluent pH.
Instrum. Technol.
,
65 -
68
-
11)
-
Saratchandran, P.: `Simultaneous identification and control of discrete-time single input single output systems', 1978, D. Phil. Thesis, University of Oxford.
-
12)
-
Neimi, A., Jutila, P.: `pH control by linear algorithm', Presented at IFAC conference on digital computer applications to process control, June 1977, The Hague.
-
13)
-
W.R. Kneen ,
M.J.W. Rogers ,
P. Simpson
.
(1972)
, Chemistry facts, patterns and principles.
-
14)
-
S.R. Gupta ,
D.R. Coughanowr
.
Online gain identification of flow processes with application to adaptive ph control.
AIChE J.
,
654 -
664
-
15)
-
HMG: Control of Pollution Act, Sections 31 and 34, 1974.
-
16)
-
F.G. Shinskey
.
Adaptive pH controller monitors nonlinear process.
Control Eng.
,
57 -
59
-
17)
-
R.L. Kirlin ,
W.C. Marshall
.
The case for state variables in pH controller design.
Control Eng.
,
47 -
49
-
18)
-
O.L.R. Jacobs
.
(1974)
, Introduction to control theory.
-
19)
-
T.J. McAvoy
.
Time optimal and Ziegler-Nichols control.
Int. Eng. Chem. Process Des. Develop.
,
71 -
78
-
20)
-
J.J. Belletrutti ,
R.M.H. Cheng ,
D.M. Sloan
.
Control of industrial acidic waste system subject to large acid influx.
ISA Trans
,
274 -
281
-
21)
-
R.W. Peters
.
Seibstanpassende pH-Wert-Regelung.
Regelungs-technische Praxis
,
10 -
14
-
22)
-
J.W. Patchell ,
O.L.R. Jacobs
.
Separability, neutrality and certainty equivalence.
Int. J. Control
,
337 -
342
-
23)
-
L. Ljung
.
Asymptotic behaviour of the extended kalman filter as a parameter estimator for linear systems.
IEEE Trans
,
36 -
50
-
24)
-
Brown, C.M.: `An introduction to media and a guide to its maintenance', ICI NWRCEG Report, May 1976.
-
25)
-
ICI: ‘An introduction to the MTS operating system running on the PDP 11’, RTL/2 reference 91 1974.
-
26)
-
Cockle, D., Scrutton, D.W.: `Plant control package for small systems – functional specification', SPL International Report, April 1977.
-
27)
-
H.S. Wilson ,
W.J. Wylupek
.
Design of pH control systems.
Meas. & Control
,
336 -
342
-
28)
-
S. Walter ,
K. Wilkie
.
Ein neues verfahren zur pH-Wert-Regelung.
Chem. Ing. Tech.
,
1071 -
1072
-
29)
-
P.J. Orava ,
A.J. Neimi
.
State model and stability analysis of a pH control process.
Int. J. Control
,
557 -
567
-
30)
-
E.R. Rang
.
Application of the popov criterion to pH-neutralisation control.
Adv. Instrum.
,
764/1 -
764/5
-
31)
-
F.G. Shinskey
.
(1973)
, pH and PION control in process and waste streams.
-
32)
-
ICI: ‘Introduction to RTL/2’, RTL/2 reference 2, 1974.
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