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production in an EvGT plant is estimated to be about 30% less than in a conventional combined cycle, as the expensive steam turbine, steam condenser and related accessories and pipings are not needed. A 600 kWe pilot EvGT plant using natural gas as fuel has been built in Lund Tekniska Högskolan. The plant has an electrical efficiency of about 55% and overall efficiency of 94%. The EvGT process is estimated to be commercially available by 2010. 1.3.5 Externally fired gas turbine Externally fired gas turbine (EFGT) is a gas turbine where the combustion chamber is replaced by a heat exchanger. The combustion takes place in f.ex. an external CFB boiler and therefore the working fluid of the EFGT is entirely clean, thus resulting in radically reduced risk of GT blade corrosion. Some coal-fired EFGT plants are already in operation, but generally more research is needed especially regarding the use of heat exchangers in high temperatures. EFGT technology is estimated to be commercially available for small-scale applications by 2010. 1.3.6 Pulverized wood-fired gas turbine The pulverized wood-fired gas turbine (PWFGT) uses wood powder as fuel for a gas turbine. The main problems of this technology are corrosion, erosion and incrustation in the gas turbine blades. Research regarding this technology is carried out at least in Luleå Tekniska Högskolan in Sweden and by Bioten company in the USA. A pilot plant of 3 MWe has already been built in Luleå, and it is expected this technology would reach commercial stage by 2010. 1.3.7 Powdered fuel combustion engine The use of wood powder as fuel for a diesel engine has been researched in Sweden. The first tests however have not been encouraging as the combustion chamber of the tested unmodified diesel engine melted after just 28 hours of test runs. Ceramic cylinder components and other modifications of the engine would be needed before this technology could break through. 13PDF Image | Small-scale biomass CHP Finland Denmark and Sweden
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