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Picture 15. Reciprocating engines enclosed in containers at Barycz landfill. Source: INiG photo. 2.2.2 Turbines Gas turbines operate based on a thermodynamic Brayton Cycle. The term “gas” refers to the atmospheric air that is taken into the engine and used as the working medium in the energy conversion process. This atmospheric air is first drawn into engine where it is compressed, heated, and then expanded, with the excess of power produced by the expander over that consumed by the compressor used for power generation. The power produced by an expansion turbine and consumed by a compressor is proportional to the absolute temperature of the gas passing through the device [26]. The majority of gas turbines presently operating at landfills are simple cycle, single shaft machines. A LFG gas turbine is very similar to a natural gas turbine except that, because of the medium heating value, twice the number of fuel regulating valves and injectors are used. Gas turbines require a high pressure fuel supply in the range of 11 to 14 bars. Using a fuel gas compressor to supply such pressure can consume a significant portion of the power being generated (parasitic losses) [27]. 52PDF Image | Landfill Gas Energy Technologies
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