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“heavies” are controlled to some degree and a good vaporiser system is appropriately placed in line after an appropriately sized regulator. In the course of this study, several LP Gas microturbine installations were found where the overall system has failed, or was in the process of failing, because of the absence of vaporizers or improperly sized regulators. As mentioned earlier, adequate pressure is still a problem particularly in colder climates. Given the state of advancement of the subject technology, LP Gas microturbines can make sense in the situations listed below: IV. • • • • • • • • • Power reliability installation (where disruption of grid generated electrical power or pipeline gas supply is not an option). Where electrical line losses are high. In hot climates, at remote locations. Where LP Gas is already the common and dominant energy/fuel source. For back-up systems at health care facilities in air quality sensitive areas (in urban areas for stand-by power). Where LP Gas is a low-cost and/or an ample supply. Peaking power plants in air pollution sensitive regions (to replace diesel power generators). Microturbines typically have no air quality runtime restrictions (most air quality sensitive areas limit conventional generator set operation to 2%-5% of the hours in a year). For small auxiliary power generation at LP Gas dealership locations in air quality sensitive areas where there are high electricity peak charges and/or in areas susceptible to blackouts. Where LP Gas can be used as a fuel quality booster for low cost, low quality, low volume combustion gases (i.e. landfill gas, digester gas, coaled methane well development). Economic Considerations On initial cost-based economics alone, microturbines will not replace reciprocating piston technology. On an initial “installed” cost-basis, LP Gas dedicated reciprocating piston technology is at about $105/kW (~$500/kW when grid connected) whereas LP Gas dedicated microturbines are at about $1,050/kW (grid connected). Over the next few years, increased production and competitive forces will lower the cost to buy and install microturbines. By 2005, the goals for microturbines are: 40% electrical efficiency, single digit emissions, and system costs below $500/kW. Whereas for power generation $500/kW is quite competitive, in the automotive industry a passenger car engine operating on traditional fuels must be below $50/kW to be competitive. Some microturbine engineers predict that when annual production exceeds 100,000 units, microturbines will cost the same or less than reciprocating engines. Without those volumes of sales, manufacturers may lose interest in the market, or be financially unable to participate. Using industry preliminary figures, it is estimated that for each delivered kW microturbines consume between 0.14 and 0.18 gallons (0.62 and 0.80 litres) of LP Gas (at 84,000 Btu/gallon lower heating value). With estimated microturbine efficiency at 24% to 27% 10PDF Image | Glotec Global Technology Network LP Gas Use in Microturbine Applications
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