Application of Modified Coke to NOx Reduction with Recycling Flue Gas during Iron Ore Sintering Process

Chen, Yanguang; Guo, Zhen; Wang, Zhi

doi:10.2355/isijinternational.48.1517

Cited by 25 publications

(20 citation statements)

References 13 publications

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“…Si and Al could hardly effect the thermal migration of fuel-N. [10][11][12][13] The researches of Liang H and Xu C. B both indicated that Fe 2 O 3 showed a reactivity to the removal of NO in the NO NO-CO-CO 2 -N 2 system. 14,15) K. Monticelli and Min Gan found that the calcium ferrite generated in the sintering process played a significant role in promoting the reaction between CO and NOx.…”

Section: Formation Of Nitrogen Mono Oxide (No) During Iron Ore Sintermentioning

confidence: 99%

Formation of Nitrogen Mono Oxide (NO) during Iron Ore Sintering Process

Fan

Min

et al. 2018

ISIJ International

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Section: Formation Of Nitrogen Mono Oxide (No) During Iron Ore Sintermentioning

confidence: 99%

Formation of Nitrogen Mono Oxide (NO) during Iron Ore Sintering Process

Fan

Min

et al. 2018

ISIJ International

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“…Given the presence of a reducing atmosphere, the iron oxide is easily reduced by CO, and the influence on the temperature field and gas component distribution in the sintering bed must be considered. The present study considered three stages of iron oxide reduction, that is, Equation (13). The reaction rate at each stage was calculated using Equation (14) [33].…”

Section: Reduction Of Iron Oxidesmentioning

confidence: 99%

“…Over the past two decades, various FGRS schemes have been proposed to reduce pollutant emissions and improve energy efficiency. Chen et al [13] improved the coke-combustion efficiency by flue gas recirculation to reduce NOx emission, when using CeO 2 modified coke and flue gas recirculation for sintering pot simulation, and the NOx reduction rate is 38.0%. Fan et al [14,15] performed a sintering-pot test and found that flue gas recycling contributes partly to NOx reduction in the sintering bed layer.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Coke Parameters and Circulating Flue Gas Characteristics on NOx Emission during Flue Gas Recirculation Sintering Process

et al. 2019

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The new process of flue gas recirculation, which reduces coke consumption and reducing NOx emissions, is now extensively used. Compared with traditional sintering, the characteristics of circulating flue gas and coke parameters significantly affect the combustion atmosphere and coke combustion efficiency. Based on the actual complex process of sintering machine, this study proposes a relatively comprehensive one-dimensional, unsteady mathematical model for flue gas recirculation research. The model encompasses NOx pollutant generation and reduction, as well as SO2 generation and adsorption. We focus on the effects of cyclic flue gas characteristics on the sintering-bed temperature and NOx emissions, which are rarely studied, and provide a theoretical basis for NOx emission reduction. Simulation results show that during sintering, the fuel NOx is reduced by 50% and 10% when passing through the surface of coke particles and CO, respectively. During flue gas recirculation sintering, the increase in circulating gas O2 content, temperature, and supply-gas volume cause increased combustion efficiency of coke, reducing atmosphere, and NOx content in the circulating area; the temperature of the material layer also increases significantly and the sintering endpoint advances. During cyclic sintering, the small coke size and increased coke content increase the char-N release rate while promoting sufficient contact of NOx with the coke surface. Consequently, the NOx reduction rate increases. Compared with the conventional sintering, the designed flue gas recirculation condition saves 3.75% of coke consumption, i.e., for 1.2 kg of solid fuel per ton of sinter, the amount of flue gas treatment is reduced by 21.64% and NOx emissions is reduced by 23.59%. Moreover, without changing the existing sintering equipment, sintering capacity increases by about 5.56%.

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“…Kasai et al 4) followed them to examine the effect of various materials as adhering fines on nuclei coke particles and found that the coke combustion rate decreased as the materials fused at the higher temperature. Since any of the two and others [5][6][7] focused on the behaviour of NOx generation, none disclosed enough information on combustion efficiency that was one of objectives of this research.…”

Section: Introductionmentioning

confidence: 99%

Effect of Granule Structure on the Combustion Behavior of Coke Breeze for Iron Ore Sintering

et al. 2013

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In order to improve the coke combustion efficiency during iron ore sintering, the effect of coke granule structure was investigated with a TG-DTA and a new combination heating equipment capable of establishing similar heating pattern to the actual sintering bed. The results were analyzed as a function of granule type and neighboring specie as follows:The granule type was crucial to the combustion behavior of granules. On the other hand, the effect of neighbors was distinct over core coke particles; meanwhile, the effect remained uncertain in pellet type granules. The authors recommend composite type granules (fine coke particles adhering on a core particle) for the best choice. The type should bring 1.2% save of coke consumption and 2.3% increase in the heat front speed in comparison to coke particles of single type.

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Application of Modified Coke to NOx Reduction with Recycling Flue Gas during Iron Ore Sintering Process

Cited by 25 publications

References 13 publications

Formation of Nitrogen Mono Oxide (NO) during Iron Ore Sintering Process

Formation of Nitrogen Mono Oxide (NO) during Iron Ore Sintering Process

The Effects of Coke Parameters and Circulating Flue Gas Characteristics on NOx Emission during Flue Gas Recirculation Sintering Process

Effect of Granule Structure on the Combustion Behavior of Coke Breeze for Iron Ore Sintering

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