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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Gaseous System Technical Information Fuel Selection and Utilization Allowable Fuels The MicroTurbine is capable of burning a wide variety of gaseous fuels to generate electrical power. A Model C30 low BTU fuel system option can provide for operation from 13,000 (350) to 26,100 kj/NM3 (760 BTU/scf). This option requires higher fuel gas supply pressures and is not available in combination with the low-pressure fuel system. For more information regarding fuels allowed on different system configurations, refer to the MicroTurbine Fuel Requirements Technical Reference (410002). Specifying Fuel Characteristics As shipped, the MicroTurbine is configured for standard natural gas fuel. If gaseous fuels with physical characteristics other than standard natural gas fuel are used, information on the physical characteristics of these fuels may be entered into the system to ensure that: a) Flame stability margins are maintained, and b) NOx exhaust emissions are minimized. Fuel Indices The MicroTurbine incorporates fuel gas physical characteristics into the control functions in the form of the fuel indices defined as follows: NOTE Index parameters must meet requirements stated in the MicroTurbine Fuel Requirements Technical Reference (410002). 2 HHVvol FUELI2 - (Not currently used on gaseous fuel systems) where: SG = fuel gas specific gravity, with respect to air HHVvol = fuel gas higher heating value, BTU/scf Fuel Index 1 (FUELI1) is a parameter related to the fuel density and energy content. If the FUELI1 parameter entered differs by more than 15 percent from the index for the actual fuel being burned, nuisance flameout or over-temperature faults may occur. Setting adjustments may be entered through the display panel keypad, or remotely, through the user interface port (UIP) upon commissioning of the system. Table 1 shows the values of FUELI1 for common fuel gases. Fuel Index 2 (FUELI2) is not currently used on gaseous fuel systems. The specific gravity (SG) and higher heating value (HHVvol) of commercial natural gas fuels may be obtained from the local natural gas supplier. Gas chromatographic analyses of non- commercial fuel gases commonly report calculated specific gravity and higher heating value. 410037-001 Rev B (January 2006) Page 8 of 15 This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the product specifications, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction. FUELI1 = SG * 1327PDF Image | Technical Reference Gaseous System Technical Information
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