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figures should only be seen as approximations. Furthermore when using this method it is easy that some of the investment for the electricity part is placed on the heat part and vice versa. This means that if the COE is relatively high it could be due to the fact that the COH is very low for the plant and therefore the most weight should be put on the total profit for the plant. The assumed value of 5000 operational hours per year might not be valid for every plant as it heavily depends on the location and the type of heat sink used. Still it is adequate when comparing technologies. The fuel used in the investigated systems have not always been brought up due to lack of information from most of the manufactures. Therefore, if nothing else is stated, wood chips with the price of 15 €/MWh was assumed to be used. The price is an average for Sweden in the year 2006. Still actual prices might be lower than 15 €/MWh in some communities especially for difficult fuels like forest residue. As mentioned this is a pre-study therefore calculations should be controlled or confirmed for the Harads plants by collecting offers from local contractors. One more important thing to consider is the investment of the district heating network which was not included in the calculations. This is one factor that has a huge impact on the total investment of the plant and is therefore very essential. Further work that would be recommended is to investigate which influence future scenarios considering electricity price changes along with fuel price developments might have on the commercialization of CHP plants in Sweden. An assessment of where the fuel is located along with which qualities that is available in the county should also be made with focus on finding out possible locations for the different technologies discussed in this study. It would also be of great interest to further investigate the externally fired gas turbine technology. With focus on the biggest holdback at present namely slagging, fouling and corrosion in the gas/gas heat exchanger. Consequently some resources should be focused on building the heat exchanger of some new highly resistant material that could withstand the conditions opposed by the hot gases. It should also be investigated if it is possibility to construct the heat exchanger in a way that facilitates cleaning, for example a shell and tube heat exchanger where the hot gases are lead through the inner pipes which could be cleaned by some type of automatic brush system. Yet another approach could be to gasify the biomass in for example a counter-flow gasifier, which has a low product gas temperature and might not form highly reactive substances as alkali salts. Therefore this product gas could be “clean” enough to combust directly before the heat exchanger, thus minimize fouling. Moreover EFGT fired with less difficult fuels as stem wood should also be looked at, since the sensitivity analysis shows that the fuel price have a very little impact on the COE. If the problem with the heat exchanger is solved in an adequate way EFGT are one of the most promising technologies for the future. Especially in the small-scale region were electric efficiency often are low for competing technologies. At present there is only one biomass based combined heat and power technology in the considered range 1-5 MWth that can be considered fully commercial, namely the organic Rankine cycle. Still there are some other technologies on the edge of becoming commercial that is the steam engine along with gas engines. Demonstration plant based on the gas engine has already shown good operation availability and relatively low electricity generation costs. 61PDF Image | Biomass Based Small Scale Combined Heat and Power Tech
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