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Chapter 6 Sensitivity analysis: moisture effects Firstly one can note that PayBack Times slightly increase and Net Present Values slightly decrease with increasing moisture in both cases and in all scenarios: the main reason lies in biomass transport costs. As mentioned in Chapter 5, in fact, a cost of 15 €/t is fixed to quantify this item, independently from the biomass energy content. Therefore if moisture increases, a higher biomass quantity is required, and thus costs grow proportionally. On the other hand, costs of raw material do not change considerably, as the higher required biomass quantity is roughly balanced by lower specific costs. Actually, as inferable from the previous discussions, a little increase is found in the no drying case, and an analogous decrease in the other two cases, but they are small variations. However, the most important and immediate observation regards gas drying performance: it is the worst solution from an economic point of view, despite its good technical results which have been previously discussed; PayBack Time curve is shifted upwards compared to the other two solutions, while the Net Present Value one is accordingly shifted downwards both for GT EXT CER and ICE GAS. The reason lies in the dryer cost, which heavily penalises this solution. Therefore the best option is to directly feed biomass in the combustor or in the gasifier when the initial moisture content is already lower than 20%; natural drying, if possible, is instead preferable when the moisture content is higher than 20%. If the latter solution were not applicable, gas drying would be mandatory in case of ICE GAS, due to the moisture limits which have already been discussed; on the contrary, solid biomass combustion, which occurs in GT EXT CER, allows the use of wet biomass and thus no drying is possible: results show that thermodynamic disadvantages of such an option are more than balanced by the economic benefits related to the non-installation of the dryer. Finally, it is clear that these are general conclusions: a lot of other issues should then be considered from a practical point of view, for instance the corrosion problems related to the use of wet biomass which could affect the heat exchanger in externally fired gas turbines [6.1] [6.2]. 219PDF Image | SMALL-SCALE BIOMASS POWER GENERATION
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