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MS7001EA Gas Turbine Stage 3 Up-Rate: Design and Field Validation

[+] Author Affiliations
Philip L. Andrew, Poorna Krishnakumar, Bruce L. Smith, Daniel D. Snook, Thomas P. Schmitt

GE Gas Turbines (Greenville), L.L.C., Greenville, SC

Paper No. GT2006-90188, pp. 487-494; 8 pages
doi:10.1115/GT2006-90188
From:
  • ASME Turbo Expo 2006: Power for Land, Sea, and Air
  • Volume 4: Cycle Innovations; Electric Power; Industrial and Cogeneration; Manufacturing Materials and Metallurgy
  • Barcelona, Spain, May 8–11, 2006
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4239-8
  • Copyright © 2006 by ASME

abstract

The time-proven MS7001EA Gas Turbine has undergone several compressor flow and firing-temperature up-rates over its life cycle to date. These up-rates, while improving output, cumulatively have driven the last stage of the turbine component away from its optimum, design-point efficiency. This paper describes an aerodynamic re-design of the last stage of the 7EA to restore its entitlement component efficiency, thus promoting Customer success through reduced heat rate and increased output. A number of patented mechanical design enhancements have also been applied in support of the aerodynamic re-design. This paper describes the application of technologies leveraged from GE Transportation, Global Research, and Energy to enhance and validate the design of the 7EA last-stage turbine nozzle and bucket. Fully-viscous, steady, 3-D Navier-Stokes analysis was applied to improve the hub reaction, lower the nozzle and bucket peak suction-surface Mach Number, and to lower the circumferential swirl component of flow exiting the turbine and entering the exhaust diffuser. A linearized unsteady CFD analysis, in conjunction with cyclic symmetry modal analysis, was applied to ensure that the aeromechanical integrity of the new design was equal to, or better than the field-proven baseline design. Back-to-back precision performance field-testing was conducted to validate the design intent performance enhancement of the re-designed stage, wherein a significant improvement in power and heat rate was demonstrated. Since installation of the redesigned Stage 3 in March, 2005, the lead 7E turbine has accumulated more than 3,900 hours and 14 starts. The re-design has been installed in a total of three units, with a total of more than 10,050 hours of successful operation. Future plans include scaling this design to the GE Frame 9E in service for 50-Hertz power-generation, and to the Frame 6B for 50 and 60 Hertz power generation applications.

Copyright © 2006 by ASME
Topics: Design , Gas turbines

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