Title: CFD-modelling of Selective Non-Catalytic Reduction of NOx in grate-kiln plants

Authors: Per E.C. Burstrom, T. Staffan Lundstrom, B. Daniel Marjavaara, Simon Toyra

Addresses: Division of Fluid Mechanics, Lulea University of Technology, SE-971 87 Lulea, Sweden. ' Division of Fluid Mechanics, Lulea University of Technology, SE-971 87 Lulea, Sweden. ' LKAB, SE-981 86 Kiruna, Sweden. ' LKAB, SE-981 86 Kiruna, Sweden

Abstract: The overall goal of this project is to find out if Selective Non-Catalytic Reduction (SNCR) technologies can be used in grate-kiln plants for NOx reduction. The technique has, to the best knowledge of the authors, never been used in this context before, despite that it is commonly used in cement and waste incineration plants. A model for spray injection into the grate was included in the model enabling a study of the overall mixing between the injected reagent droplets and the NOx polluted air. The simulations indicate that the SNCR-technique works with urea, but not with ammonia.

Keywords: NOx reduction; SNCR; selective non-catalytic reduction; urea solution; ammonia solution; grate kilns; kinetic modelling; CFD; computational fluid dynamics; simulation; spray injection; evaporation; decomposition; reagent droplets; air pollution; air quality; nitrogen oxides.

DOI: 10.1504/PCFD.2010.035361

Progress in Computational Fluid Dynamics, An International Journal, 2010 Vol.10 No.5/6, pp.284 - 291

Published online: 26 Sep 2010 *

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