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Renewable Fuels for Fluidized Bed Combustors: Current Status and Future Trends

Szentannai P., Friebert A., Winter F.

Archivum Combustionis

2008

Vol. 28 nr 1-2

77-84

Fluidized Bed Combustors have excellent mixing characteristics of the solids, high heat transfer rates and burn efficient with low emissions, together with a perfect acceptability of problematic fuels, and also the flexibility against timely changes in fuel quality. Similarly, the limitations of the fluidized bed technology became known as well. The demand on thermal utilization of a range of such "problematic" fuels such as biomass and waste increased nowadays the need of collecting and systematic exchanging of knowledge accumulated during the past three decades in the area of operating practice and knowledge of FBCs. A new network has been set up for this reason, where besides basic technical experience also open and solved problems are exchanged in a quantified manner. State of the art is already the utilization of a fuel mix (mainly wood wastes, bark, sludges, coal) in relatively small (<50 MW) and large fluidized bed combustors. Future developments are an increased utilization of sewage sludge, small fluidized bed combustors (<50 MW) with wood as the main fuel and large units (> 100 MW), as well as the utilization of municipal solid waste and gasification.