Modeling NOx emission of coke combustion in iron ore sintering process and its experimental validation

Modeling NOx emission of coke combustion in iron ore sintering process and its experimental... NOx emission of coke combustion in iron ore sintering was modeled by overall reaction rate equations of NOx formation and reduction. Incorporating into a previous sintering heat treatment model, overall NOx emission can be predicted and the simulated results were well agreed with four sinter pot tests under varying conditions which are similar to actual production. In sintering, NOx emission is significantly related to fuel combustion. Due to heat input by ignition and smaller airflow in the initial stage of sintering, the predicted NOx emission has a higher value of about 350ppm first then it decreases a little and keeps at a relatively constant level of about 300ppm until the burn-through point, and decreases rapidly as a result of the accomplishment of coke combustion. Simulation results indicate that fuel NOx is the main NOx emission in sintering while thermal NOx is rarely produced since the bed temperature is much lower than 1800K. The generated NOx could be reduced not only on the surface and in the pores of coke but also by CO around coke particles, about 50% and 10% of the generated NOx could be reduced by char and CO, respectively. Increasing coke rate and decreasing coke size promote NOx generation by accelerating the coke combustion. The reduction extent by char is greatly influenced by contact between NOx and char while the reduction extent by CO is mainly determined by the combustion atmosphere. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Fuel Elsevier

Modeling NOx emission of coke combustion in iron ore sintering process and its experimental validation

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Publisher
Elsevier
Copyright
Copyright © 2016 Elsevier Ltd
ISSN
0016-2361
D.O.I.
10.1016/j.fuel.2016.03.098
Publisher site
See Article on Publisher Site

Abstract

NOx emission of coke combustion in iron ore sintering was modeled by overall reaction rate equations of NOx formation and reduction. Incorporating into a previous sintering heat treatment model, overall NOx emission can be predicted and the simulated results were well agreed with four sinter pot tests under varying conditions which are similar to actual production. In sintering, NOx emission is significantly related to fuel combustion. Due to heat input by ignition and smaller airflow in the initial stage of sintering, the predicted NOx emission has a higher value of about 350ppm first then it decreases a little and keeps at a relatively constant level of about 300ppm until the burn-through point, and decreases rapidly as a result of the accomplishment of coke combustion. Simulation results indicate that fuel NOx is the main NOx emission in sintering while thermal NOx is rarely produced since the bed temperature is much lower than 1800K. The generated NOx could be reduced not only on the surface and in the pores of coke but also by CO around coke particles, about 50% and 10% of the generated NOx could be reduced by char and CO, respectively. Increasing coke rate and decreasing coke size promote NOx generation by accelerating the coke combustion. The reduction extent by char is greatly influenced by contact between NOx and char while the reduction extent by CO is mainly determined by the combustion atmosphere.

Journal

FuelElsevier

Published: Sep 1, 2016

References

  • Fuel nitrogen conversion in solid fuel fired systems
    Glarborg, P.; Jensen, A.D.; Johnsson, J.E.
  • Modeling of nitrogen oxides formation and destruction in combustion systems
    Hill, S.C.; Smoot, L.D.
  • Detection of reactive intermediate nitrogen and sulfur species in the combustion of carbons that are models for coal chars
    Jones, J.M.; Harding, A.W.; Brown, S.D.; Thomas, K.M.
  • The NO and N2O formation mechanism under circulating fluidized bed combustor conditions: from the single particle to the pilot-scale
    Winter, F.; Loffler, G.; Wartha, C.; Hofbauer, H.; Preto, F.; Anthony, J.E.
  • A kinetic study of the high temperature NO-char reaction
    Schonebeck, C.; Gadiou, R.; Schwartz, D.

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