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Chapter 3 Working hypotheses and preliminary analysis Parameter Unit Value Air pre-heater effectiveness % 90 Air pre-heater heat loss % 1 Air pre-heater head loss (cold side) % 1.5 Air pre-heater head loss (hot side) % 2.5 Air fan isentropic efficiency % 75 Air fan mechanical efficiency % 95 Air fan motor efficiency % 95 Filters Head loss % 1 Table 3.11 – Biomass devices design data. As already anticipated, datum concerning gasifier specific consumption does not account the gasifier power need only, but also those relating to all the syngas cleaning devices that are neglected in this work. Small-scale gasifiers normally work at ambient pressure, but the pressurised solution has also been considered for gas turbine feeding (the mentioned air compressor is now required): in this case, the parameter depends on the required conditions in the combustor and thus varies from case to case. The indicated percentage of evaporated fuel moisture for the biomass dryer is 100%: this means that in the basic cases a full drying is always performed, if available. However the variation effect of this parameter is investigated further on. As shown, drying operation in gasifiers is normally performed using the air stream previously adopted for syngas cooling, while in plants with solid biomass combustion hot flue gases are being used. Performance of gas turbine biomass combustors is similar to the natural gas fuelled ones, although solid feeding involves some penalisation, as noticeable. Combustor outlet temperature, instead, varies in the different cases, as will be discussed in the next chapter. Finally, [2.21] refers to a biomass furnace having 80 ÷ 83% efficiency, from which a 15% electrical efficiency is derived: 83% efficiency has been chosen here. 128PDF Image | SMALL-SCALE BIOMASS POWER GENERATION
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