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steam is fed into a steam turbine and the condensing heat after the steam turbine is used to warm up the heating water. As a reserve there is also an oil fired boiler for water heating. [Arnstedt, 2002] The flue gases are cleaned with a multicyclone and an electrostatic precipitator. There is no flue gas condensing because the return temperature of the water from the sawmill is too high (~90°C). The electrostatic precipitator was installed in the year 2000 because new lower limits for particle emissions (150 mg/MJ) had to be met. The particle emissions before the installation were they are as low as 10 mg/MJ. [Arnstedt, Summary Electricity: District heat: Electrical efficiency: Fuel input: Fuels: Boiler: Steam values: Flue gas condensation: Emission control: Emissions: Start up year: 200 mg/MJ, but with electrostatic precipitator 2002] 2 MWe 4.9 MW 0.2 10 MW sawdust and bark grate boiler 2.8 kg/s, 470°C, 50-60 bar no multicyclone and electrostatic precipitator particles 10 mg/MJ (limit 150 mg/MJ) 1994 8.2 Växjö (Sandvik II), Vattenfall AB, 38 MWe 8.2.1 Process description Växjö combined heat and power plant consists of two parts, Sandvik I and II, which are presented in figure 22. Sandvik I is an old oil fired combined heat and power plant, which was changed to a biomass fired one in the beginning of the 1980's. Sandvik II started the operation in 1997, and nowadays Sandvik I is not operating continuously. [Växjö Energi AB, 2001] Sandvik I has a biomass fired boiler, which can also be fired with oil if necessary. The biomass fuel is mainly forest residue from the nearby region. The fuel input energy is about 65 MW with biomass and 100 MW with oil. The electricity production with biomass is about 18 MWe and with oil 30 MWe. The condenser after the steam turbine produces about 47 MW heat, when biomass is used, and 70 MW, when oil is used as fuel. [Sandberg, 2002]. 57PDF Image | Small-scale biomass CHP Finland Denmark and Sweden
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