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Chapter 6 Sensitivity analysis: moisture effects One can observe that plant response to progressive biomass drying is similar to the previous case, even if some important differences can be found. Electric power output is roughly constant (engine operation is not influenced by moisture), but in this case a little increase instead of a decrease is being verified (Figure 6.3). In fact dryer power consumption raises with biomass drying, like in GT EXT CER, but on the other hand gasifier and cleaning section consumptions diminish, as they are proportional to the fuel mass flow rate, which decreases as well both concerning solid fuel input and syngas output. In fact providing an additional power input is still required if wet biomass is charged into the gasifier, whereas overall required fuel mass flow rate diminishes if dried biomass is being used. Moreover cold gas efficiency increases and this leads to a lower syngas mass flow rate characterised by a much higher LHV (fuel power input in the engine has to be constant). Consequently chemical fuel power input decreases with increasing drying, exactly as in the previous case. A progress similar to the GT EXT CER at 100 kWel has been found concerning thermal power too, as it is gradually used to perform drying. Moreover one can note that both chemical and thermal power diminutions are roughly of the same order of magnitude compared to the previous case in relative terms, even if the latter is now less relevant, essentially due to the lower heat supply temperature. Regarding efficiencies (Figure 6.4), the electrical one obviously raises (about two percentage points in absolute terms, i.e. six points in relative ones), since electric power output increases and chemical power input decreases. Thermal efficiency instead decreases, although less than in the previous case: about 1% in absolute terms and 2% in relative ones. As a consequence of higher electrical efficiency increase and lower thermal efficiency decrease, differently from the previous case, first law efficiency now raises: therefore there is no doubt concerning the convenience of biomass drying. 6.2.3 Conclusions This brief analysis has shown that progressive biomass drying involves considerable advantages from a thermodynamic point of view, both as regards GT EXT CER and ICE GAS. In both cases electrical efficiency increases, while thermal one decreases. The actual progress leads to a first law efficiency decrease in the former case and to an 202PDF Image | SMALL-SCALE BIOMASS POWER GENERATION
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