Fuel System Suitability Considerations for Industrial Gas Turbines

[+] Author and Article Information
F. G. Elliott

University of Virginia, Charlottesville, VA Solar Turbines Incorporated, 9330 Skypart Court, San Diego, CA 92123  

R. Kurz, C. Etheridge

Solar Turbines Incorporated, 9330 Skypark Court, San Diego, CA 92123

J. P. O’Connell

University of Virginia, Charlottesville, VA

J. Eng. Gas Turbines Power 126(1), 119-126 (Mar 02, 2004) (8 pages) doi:10.1115/1.1619424 History: Received December 01, 2001; Revised March 01, 2002; Online March 02, 2004
Copyright © 2004 by ASME
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Grahic Jump Location
Schematic of a gas fuel system, showing the pressure drop in various devices. If the gas is not superheated sufficiently, its temperature will eventually fall below the dew point temperature.
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Schematic of typical oil or gas platform fuel conditioning system
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Comparison of a experimental data, a commercial code, and the presented code (dpcalc) for the dewpoint calculation of a binary methane-water system. Experimental data from Joffrion and Eubank 3.
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Schematic of gas pipeline fuel delivery system with gas at greater than minimum superheat
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Engine compressor discharge pressure (PCD) as a function of engine load
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Enthalpy of the dewpoint must always be below the entahlpy of the fuel gas at inlet conditions. Gas composition is: methane 75.4%, ethane 13.8%, propane 5.25%, I-butane .86%, n-butane 1.12%, I-pentane 0.63%, n-hexane 0.21%, n-heptane 0.08%, n-octane .03%, n-nonane 0.01%, nitrogen 0.5%, carbon dioxide 1.86%, water 0.23%.
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Dewline for different gas mixtures in a pressure (bar)-temperature (K) diagram. Gas composition is: methane 73.8%, ethane 8.2%, propane 3.23%, I-butane .28%, n-butane 0.78%, I-pentane 0.24%, n-pentane 0.18%, n-hexane 0.18%, Cxx 0.71%, nitrogen 0.93%, carbon dioxide 11.68%. Cxx represents either hexane (C6), octane (C8), or decane (C10). Despite the fact that Cxx represents only 0.71% of the gas, it has a significant impact on the dew point.
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Dewpoint enthalpy for gas fuel and process path for adiabatic expansion starting with different degrees of superheat. Fuel gas composition is: methane 83%, ethane 8%, propane 3%, I-butane 0.3%, n-butane 0.8%, I-pentane 0.3%, n-pentane 0.3% n-hexane 0.4%, n-heptane 0.2%, n-octane 0.08%, n-nonane 0.02%, n-decane 0.01%, nitrogen 1.9%, carbon dioxide 1.69%.




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