Process Control Systems Episode 9 pps
Process Control Systems Episode 9 pps
... WCCC/WHCH)
(9. 11)
(9. 12)
To envision what effect flow rates have upon exit temperature, Eg. (9. 11)
is
plot’ted
in Fig. 9. 4 with the same abscissa and parameter that were
used in Fig. 9. 3.
FIG 9. 4. ... with Eq. (9. 11) yields:
THI
-
THZ
1
THI
-
TCI
=
CH/AkH -k
96
•k ( WHCH/WCCC)(CC/A~C -k
35)
(9. 13)
A plot of Eq. (9. 13) for conditions of
CH/AkH
= Cc/Akc = 1 is given...
Process Control Systems Episode 2 pps
... capacit’y
process is
400/al6
or 8 times as difficult to control. Recall that the pure
dead-time process was 12.5 times as difficult to control as the most
difficult two-capacity process.
The ... 1.25. Zntegral control of dead
time (aboue) is the same as propor-
tional control of a dead-time plus
integrating process (below).
Dynamic Elements in the Control Loop
I
P7
Proporti...
Process Control Systems Episode 7 ppsx
... optimiz-
ing control system, the difference between the input, and output of the
Multivariable Process Control
I
199
structure as the process, but would solve for manipulated variables.
Since each process ... November, 195 9.
7. Mamzic, C. L.: Peak-seeking Optimizers,
instruments
and Control Systems, October,
196 2.
PROBLEMS
6.1
The reactor in Example 3.4 is to be equipped wi...
Process Control Systems Episode 4 ppt
... by
Process
I
1
ml-7-7gg+
Controller ,
FIG 4.10. The complementary
controller has a model of the process
in its positive feedback loop.
L l
Linear Controllers 99
I
loop. For
t,his
reason, all controllers ... 0.76
6.00
0 .95
8.00 1.27
-__
3. 197 d
0.517&1
4.00 0.64
5.37 0.86
2.867d
0.45rJn
4.00 0.64
6. 79
1.08
Perform-
ance,
PR/100
m
4 .52sd2/rl
3.65
4.58
0 .97 72/71
0.81
0 .9...
Process Control Systems Episode 6 pot
... than
one control loop.
CASCADE CONTROL
The output of one controller may be used to manipulate the set point
of another. The two controllers are then said to be cascaded, one upon
the other. Each controller ... constant
gain for the primary loop.
RATIO CONTROL SYSTEMS
In a ratio control system, the true controlled variable is the ratio K of
two measured variables X and Y:
K=;
(6.3)...
Process Control Systems Episode 8 doc
... Feedforward Analog Computer Control
of a Superfractionator, Control Eng., March, 196 4.
4. Shinskey, F. G.: Analog Computing Control for On-line Applications,
Conlrol
Eng., November, 196 2.
PROBLEMS
8.1 ... New
York, 195 1.
PROBLEMS
7.1
Classify the five controlled variables appearing at the beginning of the
section “Decoupling Control Systems. ” If the composition of only one produ...
Process Control Systems Episode 12 pdf
... three-mode controllers from being optimally tuned, particu-
larly the noninteracting controller. So the amount of improvement possible
may only be realized
with
t,he
forward loop.
Chapter 9
9.1
Flow ... must be 96 4
lb/min;
at 240°F
inlet, it is reduced to.150 lb/min.
9. 3 Process gain is O.O41”F/(lb/
min) at 100
lb/min
feed, and 0.28a°F/
(lb/min) at 80 Ib/min, a ratio of almost...
Process Control Systems Episode 13 docx
... dual-mode control, 141
in sampling systems, 114, 115
Time-shared control, 110
(See also Direct digital control)
Transfer, auto-manual, 98 , 99
in digital control systems, 1 19
energy, control of ... pairing, 188- 198
controlled variables, choosing,
182-188
decoupling control systems, 198 -
202
Process gain, 51-53
Process model, for decoupling systems,
198 -202
of dist...
Liquid Process Piping Episode 9 pps
... C 98 (210) 298 (570) 98 (210) 398 (570) 398 (570) 32 (90 ) 98 (210)
Inconel U 298 (570) 32 (90 ) 26 (80) 32 (90 ) 32 (90 ) 98 (210)
Monel 98 (210) 298 (570) U U U U 98 (210)
Nickel 98 (210) 32 (90 ) ... 98 (210) 98 (210)
Monel 204 (400) 98 (210) 98 (210) 98 (210) 98 (210) 98 (210) 98 (210)
Nickel U 98 (210) 98 (210) 98 (210) 98 (210) 98 (210) 98 (210)
304 SS 49 (120) 1 4...
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