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Economic Evaluation Anheden [28] also made an approximate economic analysis, the figures have been corrected with CPI for the year 1999-2007 and a $/€ rate of 0.875. The results and assumptions are shown in Table 2.10. Table 2.10 Economic assumption and COE for Anheden simulations Fuel power Investment Specific investment Interest rate Economic lifetime Annual operation hours COE [MWfuel] 8 [M€] 7-8 3351-3858 [%] 5 [€/kWel] [Years] 25 [Hours] [€/MWhel] 4000-5000 76-61 Increasing the annual operation hours to 7000 hours per year will reduce the COE to 50-59 €/kWhel. One interesting thing to point out is that the gas/gas heat exchanger is assumed to account for 12-17% of the total investment. Talbott’s Biomass Energy Talbotts is the UK’s largest manufacturer of biomass heaters and boilers and has developed a commercial applicable EFGT-system, the “BG100 biomass generator”. The BG100 is capable of operating on a wide range of biomass fuels, including forest- and agricultural residues, wood chips, wood pellets and various energy crops. The unit will produce 100 kWel along with 200-250 kWth. This is below the minimum of 1MWth which was the lower boundary limit for this study. However it was included, since it was the only commercial EFGT technology that could be identified at present, [30]. The first installation of BG100 took place at Harper Adams University College in December 2005. It supplies 25% of Harper Adams electricity demand and could provide for a large part of heat needed by the student union and conference buildings. The objective of the project was to “demonstrate a fully vertically intergraded on-farm CHP system which includes the production, harvesting and utilization of a range of biomass energy sources and the subsequent distribution of the thermal energy generated thorough an on-site heat network.”, [31]. Technology The BG100 utilize an open-cycle technology. Biomass enters the furnace from a fuel bunker. The furnace has a triple pass ceramic lined combustion zone which accepts fuel with moisture content up to 40%, [30]. Flue gases exits the furnace and are fed through a gas/gas heat exchanger which heat up compressed air to about 800°C. The air is then expanded in a turbine which is direct coupled with a power generator. The turbine exhaust is further used as combustion air in the furnace and the residual heat of the furnace flue gases are capture in a 30PDF Image | Biomass Based Small Scale Combined Heat and Power Tech
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