Process Control HW 10 Help Session
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Transcript of Process Control HW 10 Help Session
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Process Control HW 10 Help Session
Kevin SiggardTierra Duffield
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10.1
• Assumptions– Pressure drop is negligible (given in problem
statement)– Constant Pressure and Temperature– Flow is incompressible– The density of the air is unaffected by the Chlorine
concentration
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10.1
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10.1
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10.1
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10.1
• Would this be acceptable if this were a carbon monoxide leak?– NO• It takes a very short amount of time for an abundant
supply of carbon monoxide to saturate the blood stream• ∴ 1.72 minutes is unacceptable and possibly deadly
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11.1
• See Fig. 11.8 for a standard block diagram• The only change that must be made to Fig.
11.8 is to add one more disturbance variable because the problem statement tells us to treat both the feed flow rate and the feed composition xf as disturbance variables
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11.1 (Fig. 11.8)
Gm
Km Gc Gv Gp
Gd
Ysp E P UYsp
Ym
Yu Y
Yd
D
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11.1 (Fig. 11.8 adapted)D1
Gd1
Gm
Km Gc Gv GpYsp E P UYsp
Ym
Yu Y
Yd2
Gd2D2
Yd1
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11.3. P only controller for a stirred-tank heater control system part a)
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11.3 part b)
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11.3 part b)
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11.3 part c)
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11.3 part c)
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Typo in 11.4
Apparently, there are typos in problem statement. Specifically use
and
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11.4 part a)
Gm
Km Gc G_IP Gv GpC’3sp(s) E(s) P’(s)
P’T(s)C’3sp(s)
C’3m (s)
Q’2(s)C’3(s)X2
GdC ‘2 (s)
X1
C’3 (s)
lb solute/ft^3
ma ma ma psiGal/min
lb solute/ft^3ma
lb solute/ft^3
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11.4 part b)
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11.4 part b)
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11.4 part b)
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11.4 part b)
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11.4 part c)
• The trick for deciding if the PI controller needs to be retuned is determining whether or not the suggested change affects the block transfer function. If the block transfer function changes, then you will need to retune.
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11.4 part c)
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11.5 part a)
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11.5 part b) and c)
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11.5 part d) and e)
e) – The system is under damped so it will oscillate.
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11.7
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11.7
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11.7