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ISSN: 2150-3621 Print
ISSN: 2150-363X Online
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DOI: 10.1615/InterJEnerCleanEnv.v7.i2
Pages: 99
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DOI: 10.1615/InterJEnerCleanEnv.v7.i2.20
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Article price - $35.00 |
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NITRIC OXIDE EMISSION MODELING IN A BUBBLING FLUIDIZED BED FURNACE FOR BIOMASS
A. Saario
Tampere University of Technology, Institute of Energy and Process Engineering, P.O. Box 589, FIN-33101 Tampere, Finland
Antti Oksanen
Tampere University of Technology, Institute of Energy and Process Engineering
M. Ylitalo
Kvaerner Power Oy, P.O. Box 109, FIN-33101 Tampere, Finland
ABSTRACT
A bubbling fluidized bed furnace for the combustion of biomass sludge has been modeled. The nitric oxide (NO) emission of the furnace is controlled by applying the selective noncatalytic reduction technique (SNCR). The aim of the work is to find a model that is able to reasonably predict the fuel-based NO emission trends in the conditions of fluidized bed biomass combustion. Four different simplified chemistry mechanisms for fuel-based NO formation have been briefly reviewed, and their performance has been studied by comparing the predicted emission in two different cases, i.e., with and without the ammonia injections. According to modeling, the NO emission in the flue gas is reduced from 88 ppmmass to 64 ppmmass by SNCR, which is in agreement with the previous experiences of the furnace manufacturer with similar furnaces. However, it is also shown how the modeling results differ remarkably from each other, depending on the nitrogen chemistry mechanism used. Some models even predict a noticeable increase in NO emission when the ammonia injection is applied, thus giving qualitatively wrong information. The combustion model is of importance in obtaining reasonable results, and the performance of the eddy dissipation combustion model has been discussed.
pages 105-126
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