Transcript Process Control HW 10 Help Session

Process Control HW 10
Help Session
Kevin Siggard
Tierra Duffield
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
10.1
10.1
10.1
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
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
11.1 (Fig. 11.8)
D
Gd
Yd
Ysp
Ysp
Km
P
E
Gc
Ym
Gm
U
Gv
Gp
Yu
Y
11.1 (Fig. 11.8 adapted)
Yd1
D1
Gd1
D2
Gd2
Yd2
Ysp
Ysp
Km
P
E
Gc
Ym
Gm
U
Gv
Gp
Yu
Y
11.3. P only controller for a stirredtank heater control system
part a)
11.3 part b)
11.3 part b)
11.3 part c)
11.3 part c)
Typo in 11.4
Apparently, there are typos in problem statement. Specifically use
𝑞1 = 10 and 𝑞2 = 15
11.4 part a)
C ‘2 (s)
lb solute/ft^3
C’3sp(s)
Km
ma
E(s)
Gc
ma
P’(s)
X2
Gv
G_IP
Gp
psi
ma
Gal/min
lb solute/ft^3
C’3m (s)
ma
X1
Q’2(s)
P’T(s)
C’3sp(s)
Gd
Gm
C’3 (s)
lb solute/ft^3
C’3(s)
11.4 part b)
11.4 part b)
11.4 part b)
11.4 part b)
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.
11.4 part c)
11.5 part a)
11.5 part b) and c)
11.5 part d) and e)
e)
– The system is under damped so it will oscillate.
11.7
11.7
11.7