frame 6 users group - 6b gas turbine interval...

6B Users Conference | San Antonio, TX | June 19-22, 2017

6B Gas Turbine Interval ManagementAnnie Knight, 6B Engineering Platform Manager

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All relative statements are with respect to GE technology unless otherwise noted.

© 2017, General Electric Company.GE Proprietary Information - The information contained in this document is General Electric Company (GE)proprietary information. It is the property of GE and shall not be used, disclosed to others or reproduced without theexpress written consent of GE, including, but without limitation, in the creation, manufacture, development, orderivation of any repairs, modifications, spare parts, or configuration changes or to obtain government or regulatoryapproval to do so, if consent is given for reproduction in whole or in part, this notice and the notice set forth on eachpage of this document shall appear in any such reproduction in whole or in part. The information contained in thisdocument may also be controlled by the US export control laws. Unauthorized export or re-export is prohibited. Thispresentation and the information herein are provided for information purposes only and are subject to changewithout notice. NO REPRESENTATION OR WARRANTY IS MADE OR IMPLIED AS TO ITS COMPLETENESS, ACCURACY,OR FITNESS FOR ANY PARTICULAR PURPOSE.

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✓Hot Gas Path

✓Combustion

From experience and lessons learned on 3000+ installed 6B/7E/9E Gas turbines with 800+ units under Contractual Service agreements

Synchronizing and Extending Outage Intervals

Improving Performance and Extending Maintenance


Synchronizing Combustion and HGP Intervals

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AGP allows for synchronized CI and HGPI with higher Tfire

Repair Intervals

Hot Gas Path 2084F Tfire FFH 2114F Tfire FFH

PIP 32k 24k

AGP 32k 32k

Combustion 2084F Tfire FFH 2114F Tfire FFH

Std/DLN1 CL-Ext 24k -

Standard Adv. Extendor 32k 24k

DLN1+LN/ULN (Transfer) 32k 32k**Requires <200 startsAll intervals assume natural gas operation


Synchronized Interval Case Study

Current Status: DLN1+LN, PIP, 2084F Tfire

Need Additional Output/HR: Push to 2114F Tfire

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FACTORED HOURS (THOUSANDS)

8 16 24 32 40 48 56 64

CI 1 2

HGPI 1 2

MI 1

1 2 3 4 5 6 7 8

YEARS (REFERENCE – RUNNING 24/7 BASELOAD)


8 16 24 32 40 48 56 64

CI 1 2

HGPI 1 2

MI 1

2 Outages in 8 years



Synchronized Interval Case Study

Reduce Outages and Maintenance Cost: Upgrade to AGP

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8 16 24 32 40 48 56 64

CI 1 2

HGPI 1 2

MI 1

1 2 3 4 5 6 7 8

YEARS (REFERENCE – RUNNING 24/7 BASELOAD)



Advanced Hot Gas Path Upgrade

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Stage Part Improvement Benefit

1st

NozzleNew coolingImproved sealing

PerformanceDurability/Perf

BucketCooling improvementDovetail Sealing

Durability/PerfClearances

ShroudGen 3+ CoatingNew sealing

Durability and Performance

2nd

Nozzle New sealing Clearances

BucketCooling improvementDovetail sealing

PerformanceClearances

ShroudNew geometryImproved sealing

Clearances

3rd

Nozzle Improved sealing Clearances

Bucket Improved sealing Clearances

Shroud Improved sealing Clearances

Performance improvement**

Output +2% to 15%

Heat Rate Up to 5%

HGPI 32k FFH

Tfire +30F

Exh. Energy +2% to 7%

*at ISO conditions, Natural Gas, DLN | **Results depend on current hardware configuration

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AGP allows for synchronized CI and HGPI with higher Tfire


Stage 1 Shroud

Stage 1 Bucket

• STAGE 1 NOZZLE Reduced leakage with laminate sealsSeal geometry re-configurationNew cooling passages for extended life

• STAGE 1 BUCKETImproved cooling hole technologyEnhanced dovetail sealingSlot seal and pin modificationsSquealer tip improvementWheelspace purge flow swirler

• STAGE 1 SHROUDLaminate sealingExtra thick GE proprietary Gen3+ coatingSeal slot modificationNew seal geometry

Stage 1 Architecture Changes

Stage 1 Nozzle

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Improved Sealing and Component Life


STAGE 2 NOZZLE• Laminate Seals• Sealing Geometry modification

STAGE 2 BUCKET• Enhanced Dovetail sealing• Sealing pin modification

STAGE 2 SHROUD• New geometry for performance• Seal slot modification• Laminate seals• Aluminized coating

Stage 2 Shroud

Stage 2 Nozzle

Stage 2 Bucket


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Improved Cooling and Sealing


Advanced Aero Stage 3 Bucket

STAGE 3 NOZZLE• Maintain Advanced Aero pedigree• Seals geometry modification• Laminate seals

STAGE 3 BUCKET• Maintain Advanced Aero pedigree• Sealing pin modification

STAGE 3 SHROUD• New geometry• Seal slot modifications• Laminate seals• Aluminized coating

Stage 3 Shroud Advanced Aero Stage 3Nozzle - Dovetail Sealing


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Focus on Airflow Optimization

© 2017, General Electric Company. Confidential and Proprietary Information. Not to be copied, distributed, or reproduced without prior approval. All rights reserved.

Actuator

CDC

Wheel-space

CDC wall

Valve

6B ATV recovers lost performance at medium and low ambient conditions

Problem statement:

• 6B Forward Wheel Space can exceed temperature limits during hot day conditions

• Need cooling flow increase to maintain wheel space temps below alarm limit

• Increased flow negatively impacts performance

Auto Thermal ValveWheelspace Airflow Management

Typical Performance Impact:

-0.82% MW and +0.37% SC HR

per bore plug

1

2

Solution: ATV mounted in bore plug hole

• Replaces CDC bore plugs

• Modulates cooling flow to wheelspace

• Thermal actuator responds to CTD

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Efficiency optimizer value: digitally enhanced AGP

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BetterHeat rate ($)

More poweroutput ($)

Longer intervals ($)

More heatoutput ($)

EO adds even more value

• Digital Twin thermal models for turbine boundary control

• AutoTune comes with AGP; improves flexibility, enables EO

• Performance test for unit MW and HR guarantees

AGP enhances power plant value

• Digital Twin thermal models for plant cycle optimization

• Auto-setpoint tuning seeks ideal HR for gas turbines and plant

• Performance test for plant HR baseline and outcome tracking

BetterHeat rate ($)

Common models, controls, and testing; Value from AGP and EO is additive

Questions?

frame 6 users group - 6b gas turbine interval...

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