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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Capstone MicroTurbine Fuel Requirements Table 2 presents gaseous fuel definitions for the Capstone MicroTurbine. Table 2. Capstone MicroTurbine Gaseous Fuel Definitions Methane 37.63 (1,010) 0.55 50.56 (1,357) 100% Methane (CH4). Fuels Calorific Value (HHV) (Note 1) MJ/m3 (Btu/ft3) Specific Gravity Relative to Air (Note 1) Wobbe Index (HHV) (Note 1) MJ/m3 (Btu/ft3) Composition Natural Gas A Range 28.32 to 42.10 (760 to 1,130) 0.55 to 0.80 31.65 to 55.01 (849 to 1,477) Mixture containing over 75% methane (CH4). The rest consists of ethane (C2H6), propane (C3H8), butanes (C4H10), carbon dioxide (CO2), nitrogen (N2), and H2S @ < 5 ppm V. Natural Gas B Range (Note 2) 36.14 to 42.10 (970 to 1,130) 0.55 to 0.70 41.99 to 55.01 (1,127 to 1,477) Mixture containing over 90% methane (CH4). The rest consists of ethane (C2H6), propane (C3H8), butanes (C4H10), carbon dioxide (CO2), nitrogen (N2), and H2S @ < 5 ppm V. High Btu Fuel 42.10 to 93.74 (1,130 to 2,516) 0.70 to 1.52 55.01 to 75.97 (1,477 to 2,039) Mixture containing methane (CH4), ethane (C2H6), propane (C3H8), butanes (C4H10), carbon dioxide (CO2), nitrogen (N2) and H2S @ < 5 ppm V. More ethane, propane, and butanes than Natural Gas). Commercial Propane 92.03 to 94.41 (2,470 to 2,534) 1.50 to 1.54 75.11 to 76.05 (2,016 to 2,041) Mixture containing over 87.5% propane (C3H8), less than 2.5% butanes (C4H10), less than 5% ethane (C2H6), less than 5% propylene (C3H6), less than 50 ppm ethyl Mercaptan, and H2S @ < 5 ppm V. (Note 3). LPG 93.74 to 121.35 (2,516 to 3,257) 1.52 to 2.01 75.97 to 85.66 (2,039 to 2,299) Mixture consisting mainly of propane and butanes in varying amounts, with the butanes content between 2.5% and 100%, plus H2S @<5ppmV. Landfill/ Digester Gas (Medium Btu) 13.04 to 28.32 (350 to 760) 0.80 to 1.10 12.45 to 31.65 (334 to 849) Mixture consisting mainly of methane, carbon dioxide, and nitrogen, with trace quantities of higher hydrocarbons, plus hydrogen sulfide (H2S) in quantities >5 ppm V, but <70,000 ppm V. (Note 4). Sour Natural Gas A Range (Note 2) 28.32 to 42.10 (760 to 1,130) 0.55 to 0.80 31.65 to 55.01 (849 to 1,477) Same properties as Natural Gas (A Range), but also contains hydrogen sulfide (H2S) in quantities >5 ppm V, but <70,000 ppm V (Note 4). Note 1: Calorific Values/Specific Gravity/Wobbe Index values taken considering 15 °C and 101.33 kPa (59 °F and 14.696 psia). Note 2: Higher Heating Value (HHV) range is per Table 2-I of the Gas Research Institute report (entitled Variability of Natural Gas Composition in Select Major Metropolitan areas of the United States), dated March 1992. Note 3: If the fuel is supplied from the storage tank as a vapor, then it is important not to allow the tank to empty or to operate below 20% full capacity before replenishing to prevent excessive butane content. Excessive butane content results in a higher dew point temperature and formation of liquid hydrocarbons that cause MicroTurbine (engine) damage. Note 4: Refer to Capstone Technical Reference 512531, for information relating to Landfill/Digester Gas Usage. 410002-001 Rev A (DRAFT) Page 9 of 31 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 equipment ratings, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | Technical Reference Capstone MicroTurbine Fuel Requirements
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