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4.9.2 Process description The plant uses wood chips, bark, sawdust and peat (50%) as fuels. According to Juhani Paananen, Energy Manager of Kokkolan Energia, it is technically possible to increase the share of wood based fuels up to 80% if their prices remain competitive. The fuel is burned in a 70 MWst bubbling fluidised bed boiler supplied by Kvarner Pulping Oy. The live steam flow is 27 kg/s, the temperature of live steam is 482°C and pressure 80 bar. The relatively low live steam temperature was chosen in order to avoid chloride corrosion which would accelerate at temperatures around 500°C. After the boiler live steam is led to a 21 MW back pressure steam turbine supplied by Siemens AG. The turbine is a single case reaction turbine with extractions to feedwater tank, low pressure feedwater preheater and two district heat exchangers. There is also a heat accumulator with height of 45 m and volume of 3200 m3 and discharge power of 50 MWdh. The accumulator makes it possible to run the plant with full power in daytime when the price of electric power is higher. The power plant is located near a sulphur acid factory owned by Kemira Chemicals. The hot sulphur acid has previously been cooled with sea water but when the new power plant was built, the cooling process was renovated and equipped with three heat exchangers and connected to the district heating network. The power of the heat recovery system is 15 MWdh and it can be run either in series or in parallel with the power plant. Also a backup boiler of 12 MWdh utilising oil as fuel is installed. Process diagram of the Kokkola CHP plant including biofuel handling system at plant is shown in figure 20. 40PDF Image | Small-scale biomass CHP Finland Denmark and Sweden
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