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Chapter 6 Sensitivity analysis: moisture effects Table 6.11 (LHV is equal to 18,567 kJ/kg), then moisture is varied in the different cases taken into account. Obviously, using just one single wood type allows to completely put aside any consideration concerning the actual wood composition. FC VM Ash C H O N S Cl 17.96 81.49 0.55 50.16 6.02 43.16 0.09 0.01 0.01 Table 6.1 – Proximate and ultimate analysis of wood pellets (% w/w, db) [TF]. 6.2 Preliminary analysis As mentioned in the introduction, here it is briefly investigated how biomass drying affects thermodynamic performance, in order to demonstrate that it is a suitable operation from a technical point of view. A 20% moisture level2 has been chosen for this analysis: the reason lies in the limits imposed to this parameter by downdraft gasifiers. This limit would not be applied to direct combustion, and therefore to GT EXT CER, but for consistency reasons it has been fixed all the same also in this case (as a matter of fact, a higher moisture level would not change the qualitative concept). Simulations have been carried out considering a progressive drying from 0% (no drying) to 100% (complete drying)3. Results are provided both in numerical form (reporting only the two edge values) and graphically: not only efficiencies but also powers are now being considered for completeness reasons. Plant schemes are naturally those shown in Chapter 4 (Figures 4.1 and 4.8), apart from the gasifier configuration of course (the optimised one is still being used). 6.2.1 100 kWel size: GT EXT CER Results of the simulations are reported in Table 6.2 and in Figures 6.1 and 6.2. 1 Naturally these data could easily be derived from Table 3.1 eliminating the moisture contribution. 2 Moisture is always meant to be calculated in weight terms and on wet basis. 3 Indeed, normally a complete drying is not achieved, but this “ideal” case has been studied all the same. 198PDF Image | SMALL-SCALE BIOMASS POWER GENERATION
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