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Chapter 3 Working hypotheses and preliminary analysis Figures show how proper the choice of 800°C as equivalent gasification temperature is, since 5000 kJ/kg as LHV and 80% as cold gas efficiency are averagely achieved here (exit temperature of 500°C will then be reached via a cooler integrated in the gasifier). Indeed, as shown in Table 3.2, actual syngas composition slightly differs from the declared one (in particular CH4 is practically not present), but lower heating value and cold gas efficiency are more important in terms of energy balance. Therefore results can be considered satisfying. Name Wet basis Dry basis CO CO2 CH4 H2 N2 H2O CO CO2 CH4 H2 N2 Drypinebark 28.04 5.54 0.03 18.55 44.50 3.34 29.01 5.73 0.03 19.19 46.04 Woodpellets 22.27 8.83 0.03 20.00 41.65 7.22 24.00 9.52 0.03 21.56 44.89 Woodchips 16.38 10.94 0.01 19.90 40.66 12.11 18.64 12.45 0.01 22.64 46.26 Table 3.2 – Syngas molar composition (%) at 800°C as gasification temperature (argon contribution has been added to the nitrogen datum). This configuration will be used in all simulations and, for simplicity reasons, also in 5 MWel case, even if downdraft gasifiers are not applied here (indeed there is actually no distinction between the different types of devices in ThermoflexTM). Besides pressurised gasifiers, based on the same configuration, will also be taken into account, although this solution is normally not applied on these scales. 3.4 Syngas issues The use of biomass syngas in power plants is not a trivial matter. In particular there are three main aspects distinguishing this case from classic natural gas feeding and which have to be studied carefully: • combustion process; • syngas cleaning; • syngas low LHV. 104PDF Image | SMALL-SCALE BIOMASS POWER GENERATION
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