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Combined Heat and Power Technologies for Wastewater Facilities

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Combined Heat and Power Technologies for Wastewater Facilities ( combined-heat-and-power-technologies-wastewater-facilities )

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Chapter 2 Evaluation of Combined Heat and Power Technologies for Wastewater Treatment Facilities 2.3.3 Exhaust Emissions Microturbine exhaust emissions are amongst the lowest of all CHP prime movers. Air pollutants from micro- turbines are mainly CO and NOx, with some VOCs, while PM is negligible. Microturbines, all of which feature dry, low-NOx technology for lean combustion, achieve their lowest emissions when operated at full load. Conversely, as the percentage of full-load operation decreases, the exhaust emissions increase. Table 2-3 is a summary of microturbine advantages and disadvantages. Table 2-6. Microturbine Summary Advantages  Are available in smaller size ranges (30 to 250 kW) for smaller gas flows or smaller capacity plants.  Produce low levels of NOx and CO exhaust emissions. • • • Disadvantages LowelectricalandthermalefficienciescomparedtootherCHP technologies. Requiresignificantfuelgascleanup. Requirehighpressurefuel(75to100psig)whichrequiresfuel compression. Warmweather(above59degreesF)andhighelevationreduce power generation and fuel efficiency. Duetoissueswithfueltreatment,thusfarhavenotdemonstrated a long service life. Currentlyavailablefromonlytwomanufacturers,thuscompetition is limited. • • Arerelativelyquietandsuitableforoutdoorinstallationwithout adding a separate building. • • 2-12

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