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A typical landfill gas microturbine system has the following components [32]: • LFG compressor(s); • Gas pretreatment equipment; • Microturbine(s); • Motor control center; • Switchgear; • Transformer. Microturbine requires LFG treatment to remove moisture, siloxanes, and other impurities. The landfill gas pretreatment steps depend on the characteristics of the LFG and vary by microturbine manufacturer. In some cases, the gas is chilled to remove moisture and condensable impurities, and is reheated to supply gas above dew point temperature to the microturbine. In addition to moisture removal, some manufacturers require an adsorption step using activated carbon to remove virtually all impurities [32]. Most of manufacturers for example Capstone have established a fuel specification that 3 requires less than 5 ppbv (~ 0,03 mg/m ) of siloxane. The prolonged exposure to untreated LFG results in a progressive loss of performance due to silica buildup in the combustor and recuperator [9]. Capstone’s MicroTurbines can accept high levels of hydrogen sulphide (H2S). For example the Capstone CR30 can accept H2S levels as high as 70,000 ppm, and the CR65, CR200, and CR1000 are able to operate with up to 5,000 ppm [33]. Other manufacturer e.g. Ingersoll-Rand has not confirmed a problem with siloxanes, but maintains an official fuel restriction of 10 ppbv of siloxane [9]. Figure.16. Microturbine process schematic Source: [26] 59PDF Image | Landfill Gas Energy Technologies
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