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The microturbine engine is a combustion turbine that includes a compressor, combustor, turbine, generator, and a recuperator. The rotating components are mounted on a single shaft supported by patented air bearings and spin at a maximum speed of 60,000 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. The microturbine can efficiently use a wide range of approved hydrocarbon-based gaseous fuels, depending on the model. 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, and biogas (landfill and digester gas) fuels. Digital power electronics control and condition the microturbine electrical output. The digital power electronics change the variable frequency AC power from the generator to DC voltage, and then to constant frequency AC voltage. During start-up, the digital power electronics operate as a variable frequency drive, and motor 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. Clean hot exhaust air can be used for process heating or cooling and can increase the overall efficiency of the system. This exhaust may be directed to an optional air to water heat exchanger. Alternately, the exhaust may be directed to customer provided devices, such as absorption chillers, which can generate cold water from the hot exhaust. The C200 MicroTurbine System requires little maintenance due to its use of air bearings. The use of air bearings, coupled with the fact that the microturbine system does not incorporate a mechanical transmission, means that no lubricants or coolants need to be periodically replaced or disposed of. Capstone MicroTurbines incorporate advanced engineering, based on more than 100 patents, and integrate an aero-based turbine engine, a magnetic generator, advanced power electronics and air bearings technology. All Capstone MicroTurbines operate: • Continuously or On-Demand • Stand alone or Grid Connected • Individually or Multi-pack • On a variety of fuels Key features of the Capstone MicroTurbine System include: • Air cooled design: no cooling system maintenance or coolant disposal issues • Patented air bearings: no lubrication system maintenance or oil disposal issues • Advanced combustion control: eliminates the need for ceramics or for other costly materials or for catalytic combustion • Oxygen rich exhaust with ultra low NOx and CO emission levels • Integral annular recuperator (heat exchanger) doubles electrical efficiency 8PDF Image | NJCAT TECHNOLOGY VERIFICATION CAPSTONE
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