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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. 2.2.3. Digital Power Electronics 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 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. 2.2.4. Fuel System 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 available microturbine models include the following fuel types: • High pressure natural gas (HPNG) • Low pressure natural gas (LPNG) • High pressure sour gas (HPSG) • Landfill gas • Digester gas • Liquid fuel • Liquid Petroleum Gas (LPG) Contact your Capstone Authorized Service Provider for data on approved fuels and performance specifications. Refer to the Fuel Requirements T echnical Reference (410002) for fuel definitions. 2.2.5. Emissions The Capstone Microturbine is designed to produce very clean emissions. The exhaust is clean and oxygen rich (approximately 18% O2) with very low levels of air pollutants. Like all fuel combustion technology, the microturbine produces 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. Refer to the Emissions Technical Reference (410065) for detailed emission specifications. 400008 Rev G (October 2013) Page 19 of 64 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. Capstone Turbine Corporation Model C200 User’s Manual 2.2.2. Air BearingsPDF Image | Capstone MicroTurbine Model C200 User's Manual
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