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Landfill Gas Energy Technologies

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Landfill Gas Energy Technologies ( landfill-gas-energy-technologies )

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Figure17. Cross section of a Capstone microturbine. Source: [32]. Microturbines have relatively low electric efficiencies, even with a recuperator electric efficiencies are typically 20 - 32 %, with overall CHP efficiencies of 50 - 80 %. Microturbines can be successfully fired on landfill gas but with careful consideration given to the way that the gas is handled and treated. Microturbine can run on landfill gas with methane content as low as 30 % [26]. Microturbines can be used for power generation and also in combined heat and power (CHP) systems. A schematic of a microturbine-based CHP system is shown in Figure 17. In CHP applications, the waste heat from microturbine exhaust is used to produce hot water (up to 93 ̊C). This option can replace relatively expensive fuel, such as propane, needed to heat water in colder climates to meet space-heating requirements. The sale or use of microturbine waste heat can significantly enhance project economics [32]. Hot water can be used to heat building space, to drive absorption cooling, and to supply other thermal energy needs in a building or industrial process [31]. 60

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