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From an LP Gas point of view, Table 1 summarizes what’s good and what’s not so good about microturbines. Table 1 What’s Good About Microturbines What’s Not So Good About Microturbines • Low to extremely low air pollution (provide power in areas where air pollution is a highly sensitive issue). • Improved efficiency possible with recuperation of exhaust heat (to preheat the intake air); very high efficiency using copious exhaust volume for heating, chilling, drying applications. • Constitute an excellent back-up system; enable extensive peak shaving since there may be no runtime limitations. • Provide electricity and heat in places where such energy commodities are already at a premium (e.g. remote areas or islands). • Low maintenance requirements. • Small “footprint.” • Relatively quiet. • High quality electrical output. • Allows for protracted client retention in those areas/sites where LP Gas is already a dominant fuel commodity. • More forgiving of LP Gas fuel quality (once introduced as vapour in the combustion chamber) than reciprocating engines. • Lifetime own-and-operate costs lower than traditional generator sets. • Easy multi-unit arraying with no need for switchgear or other hardware. • Higher initial cost than conventional generator sets. • Low efficiency on simple cycle (simple- cycle systems are used only at sites where “waste” gases are to be disposed of [e.g. landfill gas]). • Distribution networks for parts and service are not yet mature. • Fuel pressure booster is required in colder climates. • In the event of a supply shortage emergency, the end user may be at the mercy of a fuel company that may have its resources stretched for refuelling. • Currently, when burning LP Gas, the microturbine is designed for gaseous LP Gas only. It does not like liquid droplets in the engine intake (LP Gas must be fully vaporized). • LP Gas vaporizer is required. • Fuel quality and/or fuel quality control may be issues. A potentially great advantage for LP Gas burning microturbines is that once the fuel enters the combustion chamber, the typical fuel quality considerations (i.e. maximum propane content, maximum butane content, methanol content, etc.) may not matter as much. But getting the fuel through the injector into the combustion chamber may still be an issue since there appears in several applications to be some deposits on the injectors. Thus, the composition of refinery produced LP Gas may be lesser of an issue as long as the 9PDF Image | Glotec Global Technology Network LP Gas Use in Microturbine Applications
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