File:Patterson VR VS Final.pdf
The Patterson Farm is a dairy farm in upstate New York housing approximately 1,725 cows and heifers. Farm operations generate approximately 50,000 gallons per day of manure and process water. This waste is collected and pumped to a complete mix anaerobic digester designed by RCM Digesters of Berkeley, California. The digester’s dimensions are approximately 135 by 125 by 16 feet deep with a total waste capacity of approximately 270,000 cubic feet. Following the digester, solids are separated and composted in a solids removal system. Composted solids are later used as animal bedding and separated liquids are stored in a lagoon until used in the fields.
In addition to farm waste, operators also feed cheese whey waste generated off-site into the digester. The anaerobic digestion system produces biogas that is typically about 45 percent methane and has an average lower heating value (LHV) of approximately 525 Btu/scf. Approximately 4,800 cfh of the biogas is used to fuel an on-site DG/CHP system, and the remainder is flared. The DG/CHP system consists of a Caterpillar Model 379, 200 kW engine-generator set with integrated heat recovery capability. The engine tested was not equipped with any add-on emission control equipment.
Prior to being used as fuel, the wet biogas is passed through two Filtration Systems, Inc. Model G82308 water filtration units arranged in series to remove moisture from the gas. Dry biogas is then metered and delivered to the engine. During normal farm operations, the engine generates nominal 187 kW power at an electrical efficiency of approximately 22 percent. The facility is equipped with net power metering so that excess power generated on-site can be exported to the grid and credited. The engine is equipped with a heat recovery system that recovers heat to warm the digester. Excess heat is dissipated through a radiator. Water with trace amounts of rust inhibitor is used as the heat transfer fluid. The farm has plans to expand engine heat use by supplying hot water to the milking parlor in the future. This expansion would increase biogas utilization at the site, decrease flare emissions, and improve thermal efficiency of the CHP system.
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|current||15:38, 4 October 2012||1,275 × 1,650, 43 pages (1.29 MB)||Bryonbean||The Patterson Farm is a dairy farm in upstate New York housing approximately 1,725 cows and heifers. Farm operations generate approximately 50,000 gallons per day of manure and process water. This waste is collected and pumped to a complete mix anaerobic|
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