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4.2.2 Process description The plant uses bark, sawdust and forest chips as fuels. The moisture content of the fuel is usually between 50 – 65%. The wet fuel is burned in an underfeed rotating grate fired boiler supplied by Sermet Oy. Steam values after the boiler are 350°C and 24 bar and the live steam flow is 2.8 kg/s. The steam is led into a 6-cylinder engine turbine producing 0.9 MW electric power. After the engine the steam is led to a heat exchanger to produce district heat. Condensed water is then pumped back to the boiler. Currently Wärtsilä Biopower is suppling CHP plants with steam turbine. First plant is in operation in Kiuruvesi town, owned by the energy company Atro Oy, from Kuopio. Further CHP plants have been commissioned at sawmills in Renko and Vilppula in Finland. The production of electricity is 1.3 MWe at the Renko plant and 2.9 MWe at the Vilppula plant. The process diagram of a new Wärtsilä BioPower plant is shown in figure 16. Figure 16. Process diagram of Wärtsilä Biopower power plant (2.3 MW electricity). Summary: Electricity: District heat: Electrical efficiency: Power-to-heat ratio: Overall efficiency: Fuel input: Fuels: Boiler: Steam values: Start up year: 0.9 MWe 6 MWdh 0.11 0.15 85% 8.1 MWfuel sawdust, bark, wood chips underfeed rotating grate 2.8 kg/s, 350°C, 25 bar 1999 29PDF Image | Small-scale biomass CHP Finland Denmark and Sweden
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