Detection and Diagnosis of Plant- wide Oscillations: An Application Study Vinay Kariwala M.A.A. Shoukat Choudhury, Sirish L. Shah, J. Fraser Forbes, Edward S. Meadows Department of Chemical and Materials Engineering University of Alberta Hisato Douke, Haruo Takada Mitsubishi Chemical Corporation, Mizushima, Japan
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Detection and Diagnosis of Plant-wide Oscillations: An Application Study Vinay Kariwala M.A.A. Shoukat Choudhury, Sirish L. Shah, J. Fraser Forbes, Edward.
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Detection and Diagnosis of Plant-wide Oscillations: An Application Study
Vinay Kariwala M.A.A. Shoukat Choudhury, Sirish L. Shah,
J. Fraser Forbes, Edward S. Meadows Department of Chemical and Materials Engineering
University of Alberta
Hisato Douke, Haruo TakadaMitsubishi Chemical Corporation,
Mizushima, Japan
2Outline
• Problem Description
• Detection• Theory (Autocorrelation function)
• Application Results
• Diagnosis• Theory (Valve Stiction)
• Application Results
• Future Directions
3Problem Description
Feed
Condenser
Top ProductReflux Drum
Side Stripper
Stripper
Distillation Column
Oscillations in
Condenser Level
Bottom Product
4Problem Description
• Condenser Level
• Oscillations with Large amplitude
• Back-off from Optimal operating point
• Economic Potential
1% increase in set points ~ 20M Yen/year
• Previous attempts
• PID tuning, MPC model
• Not successful
5
6Scope of Analysis
Column 1
FC8
LC10
LC9
FC7
LC8
FC6
FC5
LC7
LI1
LC2
PC1
LI2
LC1
FI1
FI3
AC1
FC2
TC1
AC2
LC3
FI2
LC4
LC5
LI3
SI1
PC2 PC
3
PC4
PC5
TI4 TI
5
TI6
TC2
FC3
FC4
LC11
TI1
Column 2
Compressor
LC6
TI2
TI3
FC1
FI4
Heat Exchanger
Chain
LI5
LI4
7Data Description
Data Set: 2880 samples, 1 min. data,
Variables: 45 Tags + 15 Controller Outputs (MV)
• 15 SISO control loops• 5 cascade control loops• 2 DMCs
8Detection Philosophy
• Which variables are oscillating?• Which variables have common
oscillations?
• Important to find• All variables with common oscillations