Gas turbine thermal performance is dependent on many external conditions, including fuel gas composition. Measured performance must be corrected to specified reference conditions prior to comparison against performance specifications. A performance correction for fuel composition is thus required. One current method of correction commonly used is to characterize fuel composition effects as a function of heating value and hydrogen to carbon ratio. This method has been used in the past within a limited range of fuel composition variation around the expected composition, yielding relatively small correction factors on the order of . With industry trends suggesting continued exposure of gas turbines to a broader range of fuels such as liquefied natural gas and synthesized low BTU fuel, the corresponding performance effects will be much larger. As a result, a more comprehensive correction methodology is required to encompass a broader range of fuel constituents encountered. Analytical studies have been completed with the aid of thermodynamic models to identify the extent to which the Wobbe index can be used to correlate the response of gas turbine performance parameters to fuel gas composition. Results suggest that improved performance test accuracy can be achieved by using the Wobbe index compared with the aforementioned conventional fuel characteristics. This proposed method remains compliant with intent of internationally accepted test codes such as ASME PTC-22, ASME PTC-46, and ISO 2314.
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October 2011
Technical Briefs
Gas Turbine Gas Fuel Composition Performance Correction Using Wobbe Index
Bryan Li,
Bryan Li
Gas Turbine Thermal Performance Engineer
GE Energy Services
, Schenectady, NY 12306
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Mike J. Gross,
Mike J. Gross
Senior Technical Manager
GE Energy Services
, Moreland Hills, OH 44022
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Thomas P. Schmitt
Thomas P. Schmitt
Senior Technical Manager
GE Energy Services
, Billerica, MA 01821
Search for other works by this author on:
Bryan Li
Gas Turbine Thermal Performance Engineer
GE Energy Services
, Schenectady, NY 12306
Mike J. Gross
Senior Technical Manager
GE Energy Services
, Moreland Hills, OH 44022
Thomas P. Schmitt
Senior Technical Manager
GE Energy Services
, Billerica, MA 01821J. Eng. Gas Turbines Power. Oct 2011, 133(10): 104501 (4 pages)
Published Online: May 2, 2011
Article history
Received:
July 16, 2010
Revised:
November 8, 2010
Online:
May 2, 2011
Published:
May 2, 2011
Citation
Li, B., Gross, M. J., and Schmitt, T. P. (May 2, 2011). "Gas Turbine Gas Fuel Composition Performance Correction Using Wobbe Index." ASME. J. Eng. Gas Turbines Power. October 2011; 133(10): 104501. https://doi.org/10.1115/1.4003453
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