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Dioxide can have a significant detrimental effect on human wellbeing. NOx are also a precursor to O3 formation, which causes smog and respiratory problems. CO is a criteria pollutant because of its potential detrimental impact on human wellbeing. It is a poisonous gas formed when carbon based fuel is not fully burned. THC are also the product of incomplete combustion. Emission levels of THCs decrease as combustion temperatures increase. Volatile Organic Compounds (VOC) are a subset of THC. Some reactive VOCs contribute to smog. 3. Capstone’s Low Emissions Combustion Process At its full power operating range the Capstone MicroTurbine, fueled with natural gas, produces NOx and THC emissions levels of less than 9ppm. CO emissions are less than 40ppm at full power operating points. There is a variation in emissions between individual units, but Capstone always warrants the NOx emissions to be less than 9ppm. Fast and precise control of the combustion process is necessary to achieve Capstone’s low overall emissions. NOx formation is minimized at lower combustion temperature, but lower combustion temperature result in higher emissions of CO and THC. To resolve this conflict and achieve low NOx emissions simultaneously with low CO and THC emissions, combustion of the fuel must occur at the lowest possible temperature whilst the air and fuel mix must remain in the combustion chamber long enough to combust most of the fuel The Capstone MicroTurbine uses a lean-premix combustion system to achieve low emissions levels at the full power range. Lean-premix operation requires operating at a high air to fuel ratio (AFR) within the primary combustion zone. The large amount of air is thoroughly mixed with the fuel before combustion. This premixing of the air and fuel Capstone Turbine Corporation 21211 Nordhoff Street, Chatsworth, California 91311 Phone (818) 734-5300 Facsimile (818) 734-5320 www.microturbine.com 6PDF Image | Capstone Low Emissions MicroTurbine Technology
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