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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 4 Thermodynamic analysis • regenerative-cycle gas turbine coupled with a pressurised gasifier and bottoming ORC (hereinafter the acronym GT GAS ORC will refer implicitly to this pattern); • hybrid gas turbine fed by solid biomass and natural gas (GT HYB). These solutions will be considered in the next chapter for the economic analysis. Table 4.10 summarises their electrical and first law efficiencies for the three scales. Concerning GT EXT CER and GT HYB, values are those presented in the previous sections, while for all the other solutions, all based on biomass gasification, the improved configuration described above has been considered, therefore results are a little better than those indicated before6. The reason why the table reports efficiencies for both cogenerative and electric configurations for ICE GAS ORC and GT GAS ORC will be explained in the next chapter. Solution ICE GAS GT GAS REG PRES GT EXT CER GT HYB 100 kWel 1 MWel ηel [%] ηI [%] 32.65 75.22 25.09 73.23 24.97 79.58 26.06 79.95 5 MWel ηel [%] ηI [%] 37.88 75.39 29.55 76.21 25.96 81.60 31.62 82.85 ηel [%] 24.45 22.07 22.61 23.62 ηI [%] 78.65 71.05 77.52 73.68 ICE GAS ORC - - - - 40.03 (CHP) 40.89 (EL) 79.33 (CHP) 67.43 (EL) GT GAS ORC - - 28.17 (CHP) 29.37 (EL) 71.61 (CHP) 54.84 (EL) 33.18 (CHP) 34.50 (EL) 75.71 (CHP) 55.80 (EL) Table 4.10 – Thermodynamic analysis: best solutions and their electrical and first law efficiencies. 6 It is clear, however, that this little improvement does not distort the sense of the comparison among the various solutions performed in the previous sections. 170

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