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The total investment in the power plant was 17.1 MEUR in 1996, which gives a 994 EUR/kWe specific investment for electric power. The investment subsidy received from the Ministry of Trade and Industry was about 1.7 MEUR. The annual maintenance costs are estimated to vary between 50 000 – 67 200 EUR/a. The relatively low specific cost of the plant were achieved as Forssan Energia themselves acted as contractor, even though Osmo Kaulamo Engineering had an important role in the project. The estimated saving compared to a turnkey delivery was about 20%. 4.8.2 Process description The main fuels used are industrial wood residues (54%) and forest chips (34%). The plant also uses building wastes and some other wood-containing substances as well as REF fuels (4%). The fuel is burned in a BFB furnace. The live steam flow is 22.8 kg/s, temperature 510°C and pressure 62 bar. After the boiler, live steam is led into a 17.2 MWe back pressure steam turbine. Turbine is equipped with two extractions, one for feedwater tank and one for second district heat exchanger. The process diagram of the plant is shown in figure 19. The use of REF fuels has caused corrosion problems with the boiler and has resulted in yearly need of repair work. Figure 19. Process diagram of Forssa power plant. 38PDF Image | Small-scale biomass CHP Finland Denmark and Sweden
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