managing fleet performance 1.0
TRANSCRIPT
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all performance data is ISOcorrected and comparedwith a fingerprint of the
engine
deviations from expectedperformance triggerdiagnostics tools to enablerapid, preventative action
ISO corrections
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Gas Turbine - baseline analysis
LM2500+DLE : Fuel flow (NTI) vs combuster inlet T
Actual performancepoints
Baseline performancelines
BC Mode
AB Mode
ABC Mode
Change burner modeto BC to save fuel ifdemand is unlikely toincrease
Shows a fuel issue forBC mode in this case -can then drill down todetermine whethermechanical or control
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Gas Compressor - baseline analysis
BC Mode
AB Mode
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Rigorous Thermodynamic Modelling for Gas Turbines & Compressors
Quickly eliminate spurious data (e.g. sensor errors)
Determine un-measured values (e.g. hot section gas path)
ModelsPredictedOutputs
Root
Cause
Discrepancies
Plant
Process
Inputs
ProcessOutputs
Actual Process
Model Based Diagnostics - principles
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Gas Turbine - Model Based Diagnosticsgas path analysis
actual process data is
compared with modelledvalues along the gas path
sensor errors are quicklyeliminated by comparisonwith modelled values
un-measured values aredetermined in the hot zoneto support component lifeprediction
fault indices are produced
enabling diagnosis at thecomponent level
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Gas Compressor -
Model Based Diagnostics
polytropic efficiency andhead coefficients aremodelled
deviations from the modelsenable possible sensorerrors to be eliminatedleading to rapidfault diagnosis
gas turbine drivercharacteristics aredisplayed on thecompressor envelope
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On Line Instrument Validationhealthy discharge temp, spurious efficiency
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On Line Instrument Validationhealthy efficiency, spurious suction temperature
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emissionsfingerprint +
calculatedemissions
fuel flow, exhaust T
mechanical condition
AIT, CDP, CDT, etc..
engineparameters +
processconditions
fuel specific gravity
fuel calorific value
etc..
Emissions Managementvalidated monitoring & reporting using performance data
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Emissions Managementengine model specific validation and characterisation - SAC
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Typical GE LM2500+DLE Gas Turbine - NOx emission profileOCMS NOx Primary Bulk Reference Baseline - All Modes (variable bleed range 50% TFL) @ 15% O2 Ref.
y = -4.82959E-01x + 2.31191E+02
y = -4.76857E-01x + 2.34661E+02 y = 5.87267E-03x2 - 5.25563E+00x + 1.20453E+03y = -2.71533E-03x2 + 1.63574E+00x - 1.83720E+02
0
10
20
30
40
50
60
70
80
90
100
260 280 300 320 340 360 380 400 420 440 460 480 500
T3SEL (Deg C)
NOX_
PRI(mg/m^
3)
NOx-PRI (AB check 1)
NOx-PRI (AB check 2)
NOx-PRI (ABC check)
NOx-PRI (BC check)NOx-CONC (BC push)
NOx-CONC (AB push 1)
NOx-CONC (AB push 2)
NOx-CONC (ABC push)
Linear (NOx-PRI (AB check 1))
Linear (NOx-PRI (AB check 2))
Poly. (NOx-PRI (ABC check))
Poly. (NOx-PRI (BC check))
EA Site Authorisation Limit
BC
AB
ABC
Full Load Rating 27.4 MW @ 470 T3SEL
75% of Rating 20.5 MW @ 425 T3SEL
50% of Rating 13.7 MW @ 385 T3SELPush
Push
Push
GE LM2500+DLE : NOx vs combuster inlet T
Authorisation limit
burner modes BC to ABto ABC
Note NOX emissionsincrease at end of eachburner mode -minimum bleed push
Emissions ManagementEngine model specific validation and characterisation - DLN
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RR Avon Mk.1533 : Gas Generator - Low Cycle Fatigue
Implementation of OEMbulletin recommendations
Calculation of cyclic usagebetween stop / start cycles& over engine life
Particularly useful in
variable load applications
Cost-effectively schedulecomponent replacementparticularly in hot section
Fleet Reliability Managementengine component life - low cycle fatigue
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Fleet Reliability Managementstandard station/unit alarm & trip categorisation
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Fleet Capital Replacement Strategybased on Performance, Emissions, Availability & Reliability data
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Fleet Capital Replacement Strategymultiple criteria decision analysis
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Fleet Capital Replacement Strategymultiple criteria decision analysis