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7. Listings of <20 MWe biomass CHP plants in Sweden There are several CHP plants in the range between 1 and 20 MWe using biomass in Sweden, but currently there are no listings of the Swedish CHP plants with their efficiencies and fuel information available. Some collected information on the Swedish district heating CHP plants using biomass and producing less than 20 MWe electricity is summarised in Table 8. Some of these power plants are further compared in Table 9. Information on the industrial CHP plants in Sweden is presented in Table 10. Most of the current CHP plants in Sweden use the conventional steam cycle to produce electricity. The boiler is usually a grate, a BFB or a CFB boiler. The electrical efficiencies vary between 20 and 35 %. From the CHP plants listed in Table 8 some boiler, steam turbine and flue gas condensing manufacturers can be mentioned. In the Falun CHP plant the BFB boiler is an Ahlström Termoflow boiler, the steam turbine is manufactured by ABB Stahl and the flue gas condensing is provided by Götaverken Miljö. In Härnösand the BFB boiler is manufactured by Fortum, the steam turbine by Ahlstom and the flue gas condensing is provided by Fagersta Energetics. The Kalrlstad CFB boiler is by Ahlström, the steam turbine in Karlstad is ABB Stahl turbine and the flue gas condensing is manufactured by Fagersta Energetics. In Lycksele the boiler is a Foster Wheeler CFB boiler and Ahlstom Power has provided the steam turbine. The new plant in Tranås is based on the bio grate technology of Wärtsilä. Some of the power plants presented in Table 8 are further compared in Table 9. The plants are graded on the basis of the power-to-heat ratio and the total efficiency, the total investment cost compared to the produced power and heat, and the technical up-to- date of the power plant. The more detailed description of the evaluation methods is attached to the Table 9. The purpose of the evaluation was to recognise some good processes that could be a basis for the further studies. The evaluation is purely technical so e.g. the value of the electricity or fuels to the power plant have not been considered. It should also be noted that the power output of the plant has an effect on the parameters estimated here, so this evaluation method tends to give lower grades for smaller plants. 51PDF Image | Small-scale biomass CHP Finland Denmark and Sweden
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