Cost-Effectiveness of Distributed Generation Technologies

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Cost-Effectiveness of Distributed Generation Technologies ( cost-effectiveness-distributed-generation-technologies )

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Cost-Effectiveness of Distributed Generation Technologies Figure A-3: Digester Cost Based on Number of Animals A linear regression model developed in AgStar program was used to develop the gas capture capital cost data.6 The model was developed using capital costs from 40 dairy farms for systems designed in 2003-2009. A.1.3 Biogas Cleanup Costs After the methane-rich gas has been collected from the digestion process, it is typically processed before use in most electricity generation systems. Depending on the electricity generation system, biogas must be processed to remove excess moisture and reduce concentrations of hydrogen sulfide (H2S), or in some cases siloxanes contained in the biogas stream. Moisture should be removed to avoid corrosion, especially for high speed engines such as microturbines. If the moisture in the air precipitates into small droplets, they can erode the blades that are spinning at a very high speed. This will lead to rapid loss of performance and unplanned overhauls. H2S is a byproduct from the bacterial breakdown of organic matter in the absence of oxygen. H2S is highly corrosive and produces accelerated wear of engine valves, and plates out on or corrodes cylinder liners and turbine blades. In addition, H2S can poison fuel cells and catalysts used for controlling NOx emissions. 6 http://www.epa.gov/agstar/documents/digester_cost_fs.pdf Itron, Inc. Appendix A-7 DG Technologies

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