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Summary Electricity: District heat: Electrical efficiency: Fuel input: Total efficiency: Fuels: Boiler: Turbine: Steam values: Flue gas condensation: Emission control: Emissions: Start up year: 9 MWe 20 MW + 6.6 MW from flue gas condensing 0.25 36 MW 1.00 forest residues and sawmill residues CFB ABB-Stal 12 kg/s, 490°C, 85 bar 2-stage electrostatic precipitator NOx < 60 mg/MJfuel, particles 1-2 mg/MJfuel 1990 8.4 Hallsberg, Sydkraft, 2.05 MWe 8.4.1 Process description The Hallsberg power plant has been producing heat and power with coal and wood pellets from the 1988, but the power plant has been out of operation since the 2000, because the district heat for the area has been produced with another nearby district heating plant. When in operation, Hallsberg produced 2.05 MWe electricity and 9 MW district heat. [Brage, 2002] Interesting in the Hallsberg power plant is the choice the of boiler. Hallsberg can burn coal and wood pellets together in a multibed combustion boiler. The multibed combustion is based on the bubbling fluidised bed technology, but with several beds on top of each other. In Hallsberg there where two bubbling fluidised beds in the multibed boiler. Coal was burned in the lower bed and wood in upper bed. Evaporator was placed between the beds and secondary air was fed under the upper bed. The steam was superheated in the boiler to the temperature of 500°C, pressure of 65 bar and the mass flow of the steam was 4 kg/s. The steam turbine at Hallsberg was manufactured by ABB Stahl. [Brage, 2002] To balance the district heat production and demand differences there was a 1200 m3 district heat water accumulator. District heat production could be increased also with the 62PDF Image | Small-scale biomass CHP Finland Denmark and Sweden
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