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SMALL-SCALE BIOMASS POWER GENERATION

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SMALL-SCALE BIOMASS POWER GENERATION ( small-scale-biomass-power-generation )

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Chapter 6 Sensitivity analysis: moisture effects natural drying. Nevertheless gas drying has required a little plant variation. It could be shown, in fact, that thermal power absorbed by air stream from hot syngas is just sufficient to dry biomass having a maximum moisture content of about 30%, therefore it has been hypothesised to perform biomass drying using hot flue gas exiting the engine6. Gas exiting the dryer is then naturally used to produce further process heat; on the other hand, air stream heated up by hot syngas is still being used partly to feed the gasifier and partly to supply additional process heat. In this case the assessment is effected not only from a thermodynamic, but also from an economic point of view, in order to investigate the overall suitability of the different options. 6.3.1 Thermodynamic analysis As in the previous analysis, results are provided both in numerical and in graphic form. Nevertheless now all numeric results are shown, as in many cases the behaviour of the various parameters is not linear. Absolute and relative variations between the edge values are also provided. It is expectable that hot gas drying will provide results similar to those proposed in the previous case, even if conditions are not exactly the same and thus some differences may be found. Finally it is easy to predict that at 0% moisture content no drying and gas drying cases will provide the same result (except for one particular case), since under those conditions, there is no difference between the two scenarios. 6.3.1.1 100 kWel size: GT EXT CER Results are summarised in Table 6.4 and shown in Figures 6.5 ÷ 6.10. 6 As specified in Charter 3, hot flue gas temperature is 515°C. This could lead to potential pyrolysis phenomena in the wood, but for simplicity this issue has been neglected. 204

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