The dynamic performance of Steam and Power Systems in process industries like petroleum refineries, petro chemical projects have crucial role in controlling process parameters. Dynamic simulation helps in predicting the performance before the plant is built.

1. Dynamic simulation of Steam
and Power System
Dr M S R Murty
msrm1951@gmail.com

2. Stream
Generators
LP
Process
VHP HP MP
PRDS
Process Process
Process
HRSGs
UBs
G
Typical Steam and Power System
Headers
107/ 510 45/ 400 20/ 340 5.5/ 220
Kg/Cm2 o C
C
G
GAS TURBINE
G
Steam
Turbine

3. Captive Power Plant - General Overview
NAPHTHA
GAS OIL
GAS TURBINE
NAPHTHA
GAS OIL
8 X 125 TPH HRSG
AUX
BOILERS
4 x 125 TPH
Refinery Fuel Oil
STEAM
TURBINE
HP steam 42 Kg/cm2
MP steam 17 Kg/cm2
To
Refinery
Power Steam
INSTALLED CAPACITY 360 MW 1500 TPH
PRESENT GENERATION 269 MW 979 TPH
EXPORT TO GEB CAPABILITY 80 MW ------------
TO GEB 132/220 kV
TO REFINERY
4 X 30 MW
8 X 30 MW
11 KV
33 KV
33 KV
11 KV
Reliance Jamnagar

4. • All 4 STGs are tested to deliver 30 MW of power.
• Steam turbines are provided with HP and MP extractions
• Maximum steam flow through one steam turbine shall be as follows
262 TPH HHP steam (Max)
Pr: 109 Kg/CM^2 @ 505 DegC
180 TPH HP steam (Max)
149 TPH HP steam (Normal)
Pr: 44.8 Kg/CM^2 @ 383 DegC
80 TPH MP steam (Max)
53 TPH MP steam (Normal)
Pr: 18.8 Kg/Cm^2 @ 282 DegC
60 TPH to Condenser (Max.)
20 TPH to Condenser (Min.)
Steam Turbine
MP
133
TPH
LP
60
TPH
Normal steam flow
HP section =15.27 MW
MP section = 5.73 MW
LP section = 11.81 MW
Reliance Jamnagar

5. Typical Steam and Power System
• 8 GTGs, 4 STGs (extraction types)
• 8 HRSGs, 4 Aux Boilers
• Steam generators and Consumers within
Process
• Turbine driven equipment in Process
• Limits on Header pressure:+3 %,- 10 %
Temperature: + or – 10 %

6. Set point
Process
Steam
Pressure
STEAM
GENERATORs
V
H
P
H
E
A
D
E
R
GOVERNING
SYSTEM
G
UPSET : SUDDEN STEAM DEMAND CHANGE
MP
LP
tph
sec

7. Set point
Process Steam
Pressure
STEAM
GENERATORs
V
H
P
H
E
A
D
E
R
GOVERNING
SYSTEM
G
UPSET : STEAM TURBINE TRIP
MP
LP

8. C
ST
G
G
G
GAS TURBINE
Div Damper
HRSG
VHP STEAM
HEADER
Upset: GT TTRIP or HRSG Trip
Fuel
Inlet Air

9. Steam and Power system Dynamics
Steam
System
Power
System
Fuel
System
Upsets in one system can influence the other

10. Header Pr Variations For T-C Upset

11. Steam Flows for Upset condition

15. Summary
• Dynamic simulation helps in predicting
transient deviations in critical process
parameters
• Tuning of control system parameters can be
done based on simulation study
• Different control strategies can be evaluated