SMALL-SCALE BIOMASS POWER GENERATION

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

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Chapter 1 Biomass and technologies for its exploitation reason, these gasifiers are normally adopted in small size applications where several starts and stops occur during the day (e.g. automotive), even if generally their use is quite limited nowadays. Figure 1.16 – Scheme of a crossdraft gasifier. Fluidised and entrained bed gasifiers represent the state of art of gasifiers. The first ones, as can be noted in the schemes shown in the next page, are substantially identical to the analogous combustion devices. Indeed these gasifiers are combustors that work in substoichiometric conditions and whose aim is then not to completely burn the solid biomass to generate hot flue gases, but to convert the biomass in syngas: apart from that, plant structure and operating principles are actually the same. The only difference lies in the necessity to add in the bed some proper catalysts (e.g. alumina or dolomite), together with the solid biomass and the inert, in order to reduce the formation of tars. Therefore, for bubbling bed gasifiers (Figure 1.17) the injected air velocity is the minimum required to keep the bed in suspension in a fluid state and the bed itself is clearly distinguished from the topping section of the reactor where only syngas is present, apart from a small quantity of dragged particles, mainly composed of ash and removed in a cyclone. 45

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