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Chapter 6 Sensitivity analysis: moisture effects All the main previously proposed remarks are in general valid here too, therefore the discussion will be shorter. As mentioned before, the no drying case is being taken into consideration only up to 20%, because this is the maximum allowable wood moisture content for downdraft gasifiers. In case of artificial drying, electric power (Figure 6.11) decreases with increasing moisture (-5%), due to the gradually increasing moisture evacuator power consumption. Differently from the scenario considered in the preliminary analysis, in fact, in this case there is no effect related to gasifier and syngas cleaning auxiliaries consumption, since biomass is now completely dried from any initial moisture content, and thus the mass flow rate treated by the gasifier (solid fuel) and by the cleaning section (syngas) is always the same. If drying is performed the natural way, the electric power output does not change, as the cycle is not influenced by the different moisture input. A little diminution (just over 1%) is found only in case of no drying, because wood and syngas mass flow rates slightly increase with moisture, and so do the auxiliaries consumptions. The progress of thermal power (Figure 6.12) is well known, at least as regards gas and natural drying: in the former case, thermal power available for the process decreases with increasing moisture due to the increasing power demand for drying (it almost halves); in the latter case useful heat output does not change. An increase with increasing moisture is instead found regarding no drying (+3%): as already discussed, syngas mass flow rate grows and so does recoverable sensible heat. The behaviour of chemical powers (Figure 6.13) is practically identical to the GT EXT CER case (Figure 6.7): moisture latent heat makes fuel power grow if drying is not carried out (+4%), otherwise a decrease is found (-22% as regards gas drying and -17% in case of natural drying). Electrical efficiencies (Figure 6.14) behave as in the GT EXT CER case as well, diminishing in case of no drying (-1.5% absolute and -5% relative) and increasing in the other two cases: +7% absolute and +22% relative with artificial drying, +6.5% absolute and +22% relative with natural drying. Differently from GT EXT CER, however, the gas drying curve is slightly higher than the natural drying one. Thermal efficiencies (Figure 6.15) denote a strong decrease as regards gas drying (-13% absolute, -30% relative), a considerable increase regarding natural drying (+9% and + 21%) and a certain constancy in case of no drying, again same as in the previous case. 213PDF Image | SMALL-SCALE BIOMASS POWER GENERATION
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