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Información tecnológica

versão On-line ISSN 0718-0764

Resumo

ESTRADA, Meliton ; MENDOZA , Crisanto   e  ROMERO, Carlos E. Numerical Simulation of the Reburning Technology for Nitrogen Oxides (NOx) Reduction. Inf. tecnol. [online]. 2006, vol.17, n.1, pp.45-52. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642006000100006.

The aim of this work was to develop modeling capabilities which could be used to simulate the processes of reduction of NOx in  reburn technology. The kinetic model developed in this work considers only some of the factors that contribute to nitrogen oxide production. Emission of NOx from the combustion of coal is an important environmental problem, since it has been demonstrated that it contributes to the formation of the acid rain and of tropospheric smog.  Gas reburning is a useful option for the reduction of emissions of NOx in installations equipped with coal-fired boilers. Gases from the boiler containing NOx, enter a reburning zone and are combined with natural gas that is injected in order to act as a reducing agent, which transforms the NOx into N2. Analyses were done for  residence times of 0.1 and 0.2 sec., at a range of temperatures between 1,000 - 2,000 K, and natural gas concentration from 7.5 - 35 %.The results show that good agreement with those of Braun although the model could be improved integrating it with a detailed turbulent fluid mechanic model.

Palavras-chave : reburning technology; coal-fired boilers; NOx  emissions; numerical simulation.

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