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Chapter 1 Biomass and technologies for its exploitation 1.5.1.1 Combustion devices From a conceptual point of view, combustion systems fed by biomass are not different from those fed by conventional fuels, being constituted by a burner or combustion chamber, where biomass is burnt, followed by a recovery section, where the generated heat is transferred to a fluid (water, thermal oil, air, etc.). On the other hand burning biomass naturally involves specific issues that must be considered in furnace design. There are three main combustion technologies (in addition to a great number of innovative solutions under investigation), summarised in Figure 1.13: • fixed bed (essentially grate furnaces); • fluidised bed (bubbling or circulating); • pulverised biomass combustion. Figure 1.13 – Biomass combustion technologies [1.30]. In fixed bed furnaces (the most common case) primary air passes through a fixed biomass bed, lying on a grate (air or water-cooled), where drying, gasification and solid char combustion take place, while gases are burnt, after secondary air injection, in an upper zone. Classification is normally based on the movement of the grate, that can be fixed, moving, travelling, rotating or vibrating. These systems are quite flexible, in fact they allow the use of different type of woody biomass, having variable dimensions and high moisture and ash content. It is necessary to distribute biomass homogeneously on 32PDF Image | SMALL-SCALE BIOMASS POWER GENERATION
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