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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Capstone MicroTurbine Fuel Requirements New Fuel Acceptance Criteria Capstone evaluates three MicroTurbine system components when considering possible new fuels. These areas are identified as noted below, and as detailed in the paragraphs on the following pages. CombustionSystemEvaluationConcerns FuelSystemEvaluationConcerns MicroTurbine(Engine)EvaluationConcerns Additional information may be obtained from within the detail Specification ASTM D2880. Combustion System Evaluation Concerns The combustion system evaluation concerns include the items presented in the following paragraphs. Stability Limits The fuel type may affect the stability of the combustion system at both steady state loads and during load changes. For example, fuels highly diluted with inert constituents may have degraded stability at low power levels. Flashback Capstone MicroTurbines typically operate at lean and premixed conditions. Many fuels have high flame speeds compared to fuels like methane. As such, fuels with high concentrations of these fast burning fuels (e.g., hydrogen) may experience flame flashback to the fuel injectors. Flashback may result in permanent damage to the MicroTurbine combustion system. Combustor Life Operation on some fuels (e.g., carbon monoxide and acetylene) may cause high combustor temperatures, reducing the life of the combustor. Likewise, liquid fuels with poor atomization qualities will result in combustion characteristics that reduce the life of the combustor. Emissions Some fuels will have inherently higher emissions levels. Liquid fuel systems will generally have higher NOx levels than natural gas systems. Landfill and digester fuels may have lower NOx levels, as well as higher CO and THC levels at full power. Fuels containing significant amounts of carbon monoxide and acetylene will also result in higher NOx emissions. For liquid fuels, atomization, which is highly dependent on fuel physical properties, also has a significant effect on emissions. 410002 Rev G (October 2009) Page 15 of 18 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 | Technical Reference Capstone MicroTurbine Fuel Requirements
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