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Small-scale CHP Plant based on a 75 kWel Hermetic Eight Cylinder Stirling Engine for Biomass Fuels - Development, Technology and Operating Experiences

Small-scale CHP Plant based on a 75 kWel Hermetic Eight Cylinder Stirling Engine for Biomass Fuels - Development, Technology and Operating Experiences

Small-scale CHP Plant based on a 75 kWel Hermetic Eight Cylinder Stirling Engine for Biomass Fuels - Development, Technology and Operating Experiences   (Citations: 3)
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Within the scope of an EU research and demonstration project (project No. NNE5-1999-00097) a small-scale CHP plant based on a 75 kWel hermetic eight cylinder Stirling engine for biomass fuels was developed and demonstrated. The furnace equipped with underfeed stoker technology is designed for temperature levels of about 1,300 °C. Moreover, an air pre-heater especially designed for the Stirling engine application to increase the electric efficiency has been developed. The Stirling engine heater is directly exposed to radiation from the combustion chamber. The nominal electric power output of the plant is 75 kW and the nominal thermal power output approx. 475 kW. The nominal electric plant efficiency amounts to approx. 12% and the nominal overall plant efficiency to about 86%. The demonstration plant has started operation in October 2003 and runs fully automatically. Up to the end of December 2003 more than 1,000 operating hours have been obtained. Evaluations of operating data show that nominal power and efficiencies specified can be achieved during full load operation. The CHP technology presented in this paper can be considered as a break through in the utilisation of Stirling engines for small-scale CHP plants using natural wood fuels and is the first application of its kind world wide.
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