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Chapter 6 Sensitivity analysis: moisture effects Focusing on Figure 6.1, electric power output remains practically unchanged: indeed, there is no reason why it should change, as all thermodynamic parameters (pressure ratio, combustor outlet temperature, etc.) are not influenced by biomass drying4. Actually a little reduction due to the dryer power consumption (related to the moisture evacuator), that is proportional to the removed moisture quantity, is being verified all the same. On the other hand, thermal power output considerably decreases with increasing drying, because more and more power contained in flues gases is required by the drying process itself and is thus no more available for the thermal user. Finally, chemical fuel power input to be fed into the cycle is constant, since thermodynamic cycle parameters are unvaried; nevertheless if wet biomass is supplied to the combustor additional chemical power is required to allow moisture vaporisation into the combustor itself. Therefore it is easy to understand why overall fuel power input decreases with increasing drying. Efficiencies progress is a natural consequence of the aforementioned power behaviour (Figure 6.2). Electric power being constant and chemical one decreasing, electrical efficiency is an increasing function of biomass drying: more than one percentage point (6% in relative terms) is gained performing a complete drying. On the other hand, as thermal power decreases more than the fuel one, thermal efficiency (ηth) diminishes too: about two percentage points are lost (4% in relative terms). Therefore first law efficiency decreases by one point. However, as mentioned more than once, this work is mainly focusing on electric power maximisation, hence biomass drying should be considered as an advantageous operation. Indeed, this is true in general terms too, in fact it is not necessary to perform an exergy analysis to understand that the 1%-increase in electrical efficiency is much more significant than the 2%-decrease in the thermal one, considering that process heat is available at very low temperature (about 70°C), corresponding consequently to very low exergy. 6.2.2 1 MWel size: ICE GAS Results of the simulations are reported in Table 6.3 and in Figures 6.3 and 6.4. 4 Indeed flue gas mass flow rate slightly changes if moisture is being removed or not, but the effects of this variation are negligible. 200PDF Image | SMALL-SCALE BIOMASS POWER GENERATION
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