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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Landfill/Digester Gas Use with the Capstone MicroTurbine Biogas Fuel Requirements Operational fuel requirements for the Capstone MicroTurbine are provided in Capstone MicroTurbine Fuel Requirements Technical Reference (410002). Capstone bases its warranty on the quality of the gas at the MicroTurbine inlet. This leaves the business partner and/or end-user responsible for the following items: Assessingtheneedforgascleanupandconditioning. Selecting and properly installing, operating, and maintaining the appropriate gas cleanup and conditioning equipment. This Biogas Application Guide is intended to provide supplementary, application- specific information for use by Capstone business partners and end-users. In the event of any conflict between the information provided herein, and the information and requirements contained within the Capstone MicroTurbine Fuel Requirements Technical Reference (410002), the Fuel Requirements Technical Reference shall take precedence. Biogas originates from the anaerobic digestion of organic waste materials. Anaerobic refers to a process that occurs in the absence of oxygen. Digestion refers to a biological process performed by microbes or bacteria, which accomplishes the digestion of the organic waste materials. The microbes/bacteria consume the organic waste material, rendering its solid residue essentially inert. The process occurs in the presence of water, ideally with the temperature and pH controlled to optimize the digestion reactions and the health of the microbes/bacteria. The primary byproducts of this process are methane (CH4) and carbon dioxide (CO2). Typically, the volumetric gas ratio of methane to carbon dioxide is approximately 60:40 for digester gas. The Capstone MicroTurbine Fuel Requirements Technical Reference (410002), table titled “Gaseous Fuel Composition and Properties Requirements,” presents the required fuel composition and physical properties for gaseous fuels. While all of these requirements are important and must be observed, the most important limitations contained in this table with respect to biogas are noted as follows: The fuel temperature must be at a minimum of 10 °C (18 °F) above its dew point anywhere within the fuel connections and the system between the Capstone MicroTurbine fuel inlet and the fuel manifold block (refer to Note 2). Calorific value (average Higher Heating Value, or HHV) must be at least 13.04 MJ/m3 (350 Btu/ft3). If necessary, biogas with less than 350 Btu/scf can be blended with natural gas for use in the Capstone MicroTurbine. 480002 Rev D (October 2011) Page 2 of 14 Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | Application Guide Landfill/Digester Gas Use with the Capstone MicroTurbine
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