Clean Air: International Journal on Energy for a Clean Environment

ISSN for PRINT: 1561-4417

For Online Access

Best Paper Award Selection - Editorial Board Site

2006, Volume7

Issue 2

99 pages

DOI: 10.1615/InterJEnerCleanEnv.v7.i2

Issue price - $128.00

A. Saario
Tampere University of Technology, Institute of Energy and Process Engineering, P.O. Box 589, FIN-33101 Tampere, Finland

A. Oksanen
Tampere University of Technology, Institute of Energy and Process Engineering, P.O. Box 589, FIN-33101 Tampere, Finland

M. Ylitalo
Kvaerner Power Oy, P.O. Box 109, FIN-33101 Tampere, Finland

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 ppm_mass to 64 ppm_mass 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.

DOI: 10.1615/InterJEnerCleanEnv.v7.i2.20 Download article, 105-126 pages

Article price - $35.00

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