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Imagination at work
GE Power & Water
CTOTF FALL CONFERENCE | COEUR D'ALENE, IDAHO | SEPTEMBER 20-24, 2015
7F DLN2.6+ Combustor Karthik Subramanian, Regional Application Engineer September 23, 2015
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© 2015, General Electric Company.
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7F DLN2.6+ combustor overview
Agenda:
DLN2.6+ overview and status
Performance features
Durability features
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7F DLN2.6+ combustor overview
Capability
• 7F.03, .04 and .05
• Enhances AGP and .05 compressor uprate performance
• Improves flexibility and availability
– 32,000 hours/1,250 starts CI
– Fuel flexibility, +/-15% MWI range, 25% Ethane
– Extended turndown by 8-10% points
• As low as < 5ppm NOx emissions
Scope of supply
Combustion: End covers, fuel nozzles, combustion casings, cap assembly, liners, transitions pieces (potential DLN2.6 re-use), flow sleeves, and cross-fire tubes
Accessories: Same accessories skid as DLN2.6e. Flex hoses, ring manifolds, cooling and sealing air piping, gas control valves within skid replaced as necessary
Controls: Mark* VIe for Autotune/ETS
*Trademark of General Electric Company.
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Swirl Vane Integral with Fuel Injection
Burner Tube Integral with Swirl Vane Casting
Inlet Flow Conditioning
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7F DLN2.6+ combustor overview
Architecture drawn from 9F series experience: • 9FB experience at 2,600F+ Tfire – NOx, dynamics, hardware thermal capability • Swozzles for fuel flexibility – LNG, shale gas, wide wobbe
9F swozzle 7F DLN2.6 swirler/peg
F-class enhancements - Integrated premixed pilots • Improved stability for low NOx and turndown • Displaces quaternary fuel circuit
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7FA DLN2.6+ combustor overview
Major feature comparisons:
7FA 2.6+ 9F DLN 2.6+ 7FA DLN 2.6 7FB DLN 2+
Fuel circuits 4 3 or 4 4 4
PM1, PM2, PM3, Pilot PM1, PM2, PM3, D5(opt) PM1, PM2, PM3, Quat PM1, PM3i, PM3o, D4
Fuel nozzle Swozzle Swozzle Swirler/Peg Swozzle
5 around 1 5 around 1 5 around 1 4 around 0
Endcover Welded Welded Brazed Welded
Liner 18.5" N263 with Super B 18.5" N263 with Super B 18" N263 with Super B 17" N263 with Super B
Transition piece
N263 with Super B N263 with Super B N263 with Super B N263 with Super B
Cap Effusion Cooled Hast-x Effusion Cooled Hast-x Effusion Cooled Hast-x Effusion Cooled Hast-x
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4 gas fuel circuits for low emissions and dynamics
through operating envelope
Head end flow path enhanced for improved
premixing and lower pressure drop
Fuel nozzles: Integrated Burner Tube for reduced air leakage,
improved emissions and fuel flexibility
Outer FN: Premixed pilot improves lean stability for
lower NOx and improved turndown
Flow sleeve: Improved for cooling while
maintaining low
pressure drop
7F DLN2.6+ performance enhancements
Shorter liner: NOx reduction
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Endcover all-welded construction
Cap: Baffle reduces dynamics
Cap effusion plate: 9FB demonstrated durability
Outer FN: Premixed pilot reduces
dynamics, improves HCF life Common 7FA.04
7FA.05 32k TP
Forward and aft casings: No fillet welds for higher
LCF life
Endcover connections: robust welds
Flow sleeve:
Improved cooling pattern, wear coated piston ring
7F DLN2.6+ durability enhancements
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DLN2.6+ experience
As of 07/01/2015 Total Fleet leader
DLN 2.6+ fleet summary Active units Hours Starts Hours Starts
9FA total
Total 41 888k 16k 40k 955
Gas only 31 661k 14k 40k 955
Dual fuel 10 227k 2k 25k 249
9FB total
Total 39 718k 15k 47k 897
Gas only 26 365k 9k 41k 897
Dual fuel 13 353k 6k 47k 843
DLN 2.6+ total 80 1.6M 31k
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© 2015, General Electric Company. Proprietary information. All rights reserved.
• New product development started in ‘10
• Builds upon proven 9F DLN2.6+ layout
• Extensive lab testing to evaluate prototype and production layouts over extreme conditions
• First fielded system achieved COD June 1, ‘15
– Characterization - 186 sensors on 2 cans
– 22 dynamic and 12 static pressure taps
– 116 thermocouples and 36 accelerometers
– ~ 10 day run to evaluate ignition/crossfire, start-up emissions, acceleration and load rate tests, part
load, base load, peak-firing, split mapping,
Autotune commissioning
• Field testing/validation yielded excellent results
• > 50 starts and ~500 hours experience
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7F DLN2.6+ status
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• First system COD June ‘15 … excellent results
• Integrated system approach in 7F.03/.04/.05 cycles … combustor, compressor, turbine, controls, generator, BOP
• Increased performance and durability compared to DLN2.6
• Performance and durability improved through: – 9F DLN2.6+ fleet experience/data assessment
– Analysis and modeling enhancements
– Component testing, combustion fired testing and
gas turbine instrumented characterization
7F DLN2.6+ summary
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