Determining Plant Capacity for a Combined Cycle Power ......General Electric 7FA gas turbines (~150...
Transcript of Determining Plant Capacity for a Combined Cycle Power ......General Electric 7FA gas turbines (~150...
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Determining Plant Capacity for a Combined Cycle Power Plant
Using PEPSEJustin Strupp
Scientech, a business unit of Curtiss-Wright Flow Control
Company
2013 Scientech Symposium – Managing Plant Assets and PerformanceClearwater Beach, Florida
August 6-9, 2013
Rex Featherston, Matthew Goodwin, Jason Lee, and
Andre NorwoodArizona Public Service
Company
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Redhawk Power Station
Two 2-on-1 Combined Cycles 492 MW Net Base LoadGeneral Electric 7FA gas turbines (~150 MW
each)Supplemental firing in the HRSGAlstom Power steam turbines (~200 MW each) Located in Arlington, ArizonaBegan operating in mid-2002
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Problem
Current Operating Assumptions (OAs)Current OA at 2-on-1 base load conditions
-20-15-10-505
101520
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
MW
Effe
ct (M
W)
Operating Assumption - RH 2-on-1 Base Load
Net Maximum Capacity = 492 MW
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Solution Needs
Use Ambient ConditionsMonthlyAccurateDocumentedRepeatableDay-ahead and/or Real-timePerformance Monitoring
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Background
Operating Assumptions used for dispatch– Max Output– Heat Rate
Current Performance up to date– Degradation and/or Repairs– Ambient Conditions
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Power Correction
Power Correction Factor for Temperature and Humidity
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Data Collection
PI Data for Ambient Conditions– Temperature– Humidity– Pressure
Collection Intervals and TimeData Collection Schemes
– Monthly Average– Peak Time Monthly Average– Conservative Monthly Outlook– Hybrid Outlook
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Ambient Conditions
Monthly Average – average over each month at 4-hour intervals from PI. Similar to current OAs.
14.2
14.3
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0
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40
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1 2 3 4 5 6 7 8 9 10 11 12
Pres
sure
(PSI
A)
Tem
p (°
F) a
nd H
umid
ity (%
)
Month #
Monthly Average
Temperature Humidity Pressure
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Ambient Conditions
Peak Time Monthly Average – average over each month using data at 5 PM each day. Peak time scenario.
14.2
14.3
14.4
14.5
0
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40
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100
120
1 2 3 4 5 6 7 8 9 10 11 12
Pres
sure
(PSI
A)
Tem
p (°
F) a
nd H
umid
ity (%
)
Month #
Peak Time Monthly Average
Temperature Humidity Pressure
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Ambient Conditions
Conservative Monthly Outlook – Peak Time Average adding (Temperature) or subtracting (humidity and pressure) the average standard deviation of the peak time condition for those months to it. Worst case scenario.
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14.1
14.2
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0
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60
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Pres
sure
(PSI
A)
Tem
p (°
F) a
nd H
umid
ity (%
)
Month #
Conservative Monthly Outlook
Temperature Humidity Pressure
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Ambient Conditions
Hybrid Outlook – average of Peak Time Monthly Average and the Conservative Monthly Outlook. A different level of conservatism.
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14.2
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14.4
0
20
40
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1 2 3 4 5 6 7 8 9 10 11 12
Pres
sure
(PSI
A)
Tem
p (°
F) a
nd H
umid
ity (%
)
Month #
Hybrid Monthly Outlook
Temperature Humidity Pressure
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PEPSE - Modeling
Translate Heat Balance and Plant Schematics into PEPSE Components
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PEPSE –Schematic With Components
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Study Modeling
Tuned PEPSE model to Heat Balances Three operating modes - each month
– 2-on-1 base load– 2-on-1 with max supplemental firing– 1-on-1 base load
Ambient Conditions – monthly for each average ambient condition
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Other Modeling Assumptions
Evaporative Cooler considerations– On above 75 °F– Off below 75 °F
Condenser PressurePump PressuresDuct Firing – Max at 1198 °FOthers
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2-on-1 Base Load Comparison
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510
520
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Net
Pow
er O
utpu
t (M
W)
Redhawk 2-on-1 Base Load Comparison
Original OAs Actual Max AveragePeak Average Conservative Outlook Hybrid Outlook
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2-on-1 Max Duct Fired Comparison
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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Net
Pow
er O
utpu
t (M
W)
Redhawk 2-on-1 Max Duct Fired Comparison
Original OAs Average Peak Average Conservative Outlook Hybrid Outlook
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1-on-1 Base Load Comparison
210215220225230235240245250255260
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Net
Pow
er O
utpu
t (M
W)
Redhawk 1-on-1 Base Load Comparison
Original OAs Average Peak Average Conservative Outlook Hybrid Outlook
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Recommended Solutions
Which to use as the new OAs for 2-on-1 Base Load, 2-on-1 Max Duct Fired, and 1-on-1 Base Load?– Average– Peak Average– Conservative Outlook– Hybrid Outlook
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Additional Work
Next Steps?– Plant data at each Operating Mode– Marketing involvement– Implement Method(s) for OAs– Day-ahead and Real-time instead of Monthly– Performance Monitoring
What could be done for better results?– More Data– Testing– Plant Data Tunes
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Questions?