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• A full laboratory analysis of gas composition from the site. The site must be able to maintain the methane content of gas at more than 50% methane (some flexibility here 3 aslongasaheatingvalueofatleast5.25kWh/m ismet). • The gas must be dry. Saturated gas is typically the norm with landfill gas. We can o implement engineers refrigerated the gas to a dew point of 4 C to remove water, and o reheated to about 20 C with good results. • Landfill gas must be filtered through a 3 micron filter. • Efforts should be made to eliminate contaminants (such as siloxanes) in the gas. Such contaminants can be deposited on components such as the flame sensor and can inhibit flame sensing and lead to nuisance heater lockout. • Minimum gas supply pressure during operation must not be less than 20 mbar and a maximum of 60 mbar with the heaters turned off. • Due to the reduced methane (heating value) content of the gas, the maximum heater input available is 30 kW. • Accelerated heater maintenance and component (such as gas valve and flame sensor) replacement schedule is expected. The first facility to use landfill gas to power infrared heaters was an active landfill in Frederick County (VA, USA). The project commenced in 2001/2002. Nine pipe infrared heaters were used to heat two facility buildings at the landfill, including a facility room (6 3 infrared heaters) and a warehouse (3 infrared heaters), using less than 51 m /h of landfill gas. The project utilised standard pipe infrared heaters retrofitted to fire landfill gas. Activated carbon drums were installed for LFG treatment prior to supply to the infrared heaters. Another example of the use of infrared heaters in maintenance facilities is at I-95 Landfill in Virginia. Since 1990, Fairfax County has been collecting LFG at its I-95 Landfill and burning it to in two plants to generate enough electricity for about 5000 homes. The plants currently capacity is 3.2 MW of electricity each, making it the largest well field and landfill/electrical generation network in the State of Virginia. Some of the excess gas (approximately 1,700 3 m /h) is sent to the nearby Norman Cole Wastewater Treatment Plant where it is used to process sludge. Although most of the LFG collected was being utilized, in 2005 the County decided to replace their existing propane-fired heating system onsite in the maintenance shop with LFG-fired 33PDF Image | Landfill Gas Energy Technologies
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