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Conclusions and future work Thanks to considerable incentives provided by the Italian legislation, economic performance is very attractive: PayBack Times of the cited best solutions are about 2 ÷ 4 years at 100 kWel and just 1 ÷ 1.5 years at the two larger scales, the actual value depending on the period of the year when recovery heat can be sold. Concerning this point, thermal energy recovery and sale is not generally mandatory like in natural gas plants, but its positive effects are clear. The hybrid gas turbine proves to be an interesting option too, thanks to low investment cost, if generated heat is sold all over the year and/or the natural gas power input share is small. A sensitivity analysis has also shown that the variation of some economic parameters (heat sale price, biomass cost, etc.) has a limited effect on the overall performance, especially if heat is sold for an appreciable number of hours during the year. Finally, biomass drying has positive effects on thermodynamic performance, but carrying out such an operation with hot flue gases is unprofitable because of the dryer cost: if the plants allows to burn wet biomass and natural drying is not possible (which otherwise is always convenient), it is better to perform no fuel drying. Basing on this work, a very wide range of activities can be planned. First of all a broad plant model library has been created in ThermoflexTM: these models could be used for deeper performance simulations, as in this work the reliability of this software has been proven also for such plant typologies. On the other hand, the identified most performing solutions can be developed with specific numeric, modelling or experimental tools: for instance, gasification and syngas cleaning processes or high temperature/ceramic heat exchanger operation may be focussed. Moreover, combined plants with an internal combustion engine or a gas turbine coupled with bottoming ORC have proven to deserve attention: these solutions are penalised by high investment costs, but are thermodynamically very performing, especially the former one. For instance, one research activity could be the coupling of topping and bottoming plants. 222PDF Image | SMALL-SCALE BIOMASS POWER GENERATION
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