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NOx and N2O Emissions During Fluidized Bed Combustion of Leather Wastes

[+] Author Affiliations
Alberto Bahillo, Lourdes Armesto, Andres Cabanillas, Juan Otero

CIEMAT, Madrid, Spain

Paper No. FBC2003-101, pp. 909-915; 7 pages
doi:10.1115/FBC2003-101
From:
  • 17th International Conference on Fluidized Bed Combustion
  • 17th International Conference on Fluidized Bed Combustion
  • Jacksonville, Florida, USA, May 18–21, 2003
  • Conference Sponsors: Advanced Energy Systems
  • ISBN: 0-7918-3680-0 | eISBN: 0-7918-3675-4
  • Copyright © 2003 by ASME

abstract

Transformation of hide (animal skins) into leather is a complicated process during which a significant amounts of wastes are generated. Fluidized bed combustion has been extended to burn different wastes that have problems with their disposal showing its technical feasibility. Considering the characteristics of the leather waste, especially the heating value (12.5–21 MJ/kg), it is a fairly good fuel. Moreover, leather waste has a high volatile matter, 65%, similar to other biomasses and an unusual high nitrogen content, 14%. The first objective of this work is to study the fluidized bed combustion of leather wastes presenting experimental results regarding NOx and N2 O emissions. A series of experiments have been carried out in a fluidized bed pilot plant to understand the importance of operating parameters such as furnace temperature, oxygen content in gases, staged combustion and residence time on the NOx and N2 O emission level. Despite having high nitrogen content, low conversion of N-fuel to NOx and N2 O was measured during the combustion of leather waste in BFB. Bed temperature and oxygen content were found as the most important single parameters on N2 O emission and only oxygen content has a significant influence on NOx emission. Leather waste exhibits a great NOx/O2 trend; NOx decreases as the oxygen concentration decreases and the effect of the combustion temperature on NOx is insignificant. Staged combustion does not give a reduction in NOx.

Copyright © 2003 by ASME

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