Abstract
Since the emission of nitric oxides (NO) from wood firings originate mainly from the fuel bound nitrogen, the most important reactions during the devolatilization and oxidation of the fuel nitrogen must be identified to design a low-NOx-furnace.
To calculate the nitric oxides that can be formed from the fuel nitrogen, a method is necessary that allows a fast and accurate analysis of the nitrogen content of natural wood, fibre boards and similar materials. In the presented method a small sample of wood is oxidized at high temperature (about 1050°C) in a nitrogen free atmosphere with a high excess of oxygen. The concentration of NO in the flue gas is analysed by chemiluminescence detection. The integrated number of NO molecules is proportional to the amount of nitrogen in the sample. It was found, that the conversion of nitrogen in the fuel to NO is sensitive to the nitrogen content, the form in which the nitrogen was originally bound in the fuel and the temperature.
The devolatilization has been investigated in an oxygen-free atmosphere in a laboratory reactor. Data on the conversion of fuel-bound nitrogen to NO during devolatilization and combustion of wood and fibre boards will be presented. The results demonstrate that during the devolatilization a part of the nitrogen in the wood is converted to HCN, NH3 and NO and more than 20 wt.-% remains in the char.
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© 1993 Springer Science+Business Media Dordrecht
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Keller, R., Nussbaumer, T. (1993). Fuel Nitrogen in Wood A New Method to Analyse the Nitrogen Content and Investigations of the Conversion to Nitric Oxides During Combustion. In: Bridgwater, A.V. (eds) Advances in Thermochemical Biomass Conversion. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1336-6_42
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DOI: https://doi.org/10.1007/978-94-011-1336-6_42
Publisher Name: Springer, Dordrecht
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