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Figure 13. Cross section of a Titan 130 Single shaft gas turbine for power generation application. Source: [28]. Gas turbines are one of the cleanest fossil-fuelled power generation equipment commercially available. Many gas turbines burning gaseous fuels feature lean premixed burners (also called dry low-NOx combustors) that produce NOx emissions below 25 ppm, and simultaneous low CO emissions in the 10 to 50 ppm range. The turbine systems require more inspections, cleaning and general maintenance with LFG. It requires higher level of LFG treatment for the removal of siloxanes [29]. This additional gas treatment increases project costs. Simple-cycle gas turbine for power-only generation has efficiencies approaching 40 % and overall CHP efficiencies of up to 80 % [26]. Gas Turbines can be used in combined heat and power (CHP) operation which is a simple cycle gas turbine with a heat recovery heat exchanger which recovers the heat in the turbine exhaust and converts it to useful thermal energy usually in the form of steam or hot water and combined cycle operation in which high pressure steam is generated from recovered exhaust heat and used to create additional power using a steam turbine. Gas turbines are mostly used in combined heat and power systems of more than 1 MW (only a few types of gas turbines of less than 1 MW are available). At the same time, it should be borne in mind that units of the smallest size feature low efficiencies and relatively high unit investment costs (upwards of USD 500/kWel) [30]. Compared with a piston engine of the same size, a gas turbine features lower generation efficiency and a markedly lower power to heat ratio (cogeneration ratio). On the other hand, a 54PDF Image | Landfill Gas Energy Technologies
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