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Capstone Turbine Corporation MicroTurbine User’s Manual MicroTurbine Engine Capstone The MicroTurbine engine is a combustion turbine that includes a compressor, combustor, turbine, generator, and (except in the Simple Cycle model) a recuperator. The rotating components are mounted on a single shaft supported by patented air bearings and spin at up to 96,000 RPM. The permanent magnet generator is cooled by the airflow into the MicroTurbine. The output of the generator is variable voltage, variable frequency AC. The generator is used as a motor during start-up and cooldown cycles. Controller The digital power electronics control the MicroTurbine system operation and all subsystem operations. The digital power electronics change the variable frequency AC power from the generator to DC voltage, and then to constant frequency AC current. During start up, the digital power electronics operate as a variable frequency drive, and motors the generator until the MicroTurbine has reached ignition and power is available from the MicroTurbine. The digital power electronics again operate as a drive during cooldown to remove heat stored in the recuperator and within the MicroTurbine engine in order to protect the system components. Air Bearings The MicroTurbine utilizes gas foil bearings (air bearings) for high-reliability, low maintenance, and safe operation. This allows fewer parts and the absence of any liquid lubrication to support the rotating group. When the MicroTurbine is in operation, a gas film separates the shaft from the bearings and protects them from wear. Fuel System The MicroTurbine can efficiently use a wide range of approved hydrocarbon-based gaseous and liquid fuels. The MicroTurbine includes an integral fuel delivery and control system. The standard system is designed for pressurized hydrocarbon-based gaseous fuels. Other models are available for low-pressure gaseous fuels, gaseous fuels with lower heat content, gaseous fuels with corrosive components, biogas (landfill and digester gas), and liquid fuels. Contact your Capstone Authorized Service Provider for data on approved fuels and performance specifications. Emissions The Capstone MicroTurbine is designed to produce very safe emissions. The exhaust is clean and oxygen rich (approximately 18% O2) with very low levels of air pollutants. Like all fossil fuel combustion technology, the MicroTurbine can produce dangerous emissions (like nitrogen dioxide and carbon monoxide) from the fuel combustion process. The MicroTurbine has ultra low nitrogen dioxide (NO2) and carbon monoxide (CO) emission levels. Some fuels will have inherently higher emissions levels. Liquid fuel will generally have higher nitrogen dioxide and carbon monoxide levels than natural gas. Landfill and digester gas fuels can have lower nitrogen dioxide levels with higher carbon monoxide levels at full power. Fuels containing significant amounts of carbon monoxide and acetylene (C2H2) will also result in higher nitrogen dioxide emissions. Page 12 of 56 400001-001 Rev. C (February 2005) 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.PDF Image | Capstone MicroTurbine User's Manual
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