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Analysis of the combined injection of pulverized coal and charcoal into large blast furnaces

Journal of Materials Research and Technology 2013年第4期2卷 308-314页

作者： De Castro, José Adilson Araújo, Giselle De Mattos Da Mota, Izabel De Oliveira Sasaki, Yasushi Yagi, Jun-Ichiro Postgraduation Program in Metallurgical Engineering Universidade Federal Fluminense Volta Redonda RJ Brazil Environmental Metallurgy Laboratory Graduate Institute of Ferrous Technology POSTECH-Pohang University of Science and Technology Pohang Korea Republic of Tohoku University Sendai Japan

The simultaneous injection of pulverized coal and charcoal in the blast furnace has recently received remarkable attention due to its potential to decrease the coke consumption and increase productivity. This paper is focused on modeling the simultaneous injection of pulverized coal and charcoal into the blast furnace through the tuyeres with oxygen enrichment. This model treats the blast furnace as a multi-phase reactor and six phases are considered simultaneously, namely: gas, lump solids (lump iron ore, sinter, pellets, coke and small coke), hot metal, molten slag, pulverized coal and charcoal. Conservation equations of mass, momentum, energy and chemical species are solved simultaneously based on the finite volume method. The model is validated with a base case of actual operation using 215 kg/thm of pulverized coal injection and afterwards mixed injection of coal and charcoal are simulated for injection rate of 250 kg/thm. Model results indicated that the productivity of the blast furnace could be increased up to 25% with simultaneous injection combined with oxygen enrichment. © 2013 Brazilian metallurgical, Materials and Mining Association.

关键词： Blast furnaces

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Study of the induration phenomena of a single pellet in the travelling grate furnace

Study of the induration phenomena of a single pellet in the ...

引用

6th International Congress on the Science and Technology of Ironmaking 2012, ICSTI 2012

作者： De Paula Vitoretti, Flavia De Castro, José Adilson PostGraduation Program on Metallurgical Engineering Metallurgical Industrial School Engineering of Volta Redonda Federal Fluminense University Brazil

ISBN: (纸本)9781627480215

The process for pelletizing iron ore fines is an important operation unit for producing high quality of raw materials for the subsequent reduction processes such as blast furnace or direct reduction. The process essentially involves production of green pellets and induration on a traveling grate furnace to promote inner partial melt and agglomeration that confers adequate physical and metallurgical proprieties. This work focuses on the phenomena that occur in the firing step aiming the construction of a mathematical model that describes each phase and chemical species. The model is formulated based on transport equations able to predict the evolution of the temperature profile inside of the pellet for each zone on the induration furnace. It is taken into account coupled phenomena of momentum, energy and mass transfer between gas and particles within the agglomerates. The finite volume method is used to discretize the transport equations of momentum, mass and energy describing the behavior of a pellet in a industrial travelling grate furnace. Model results are shown for the temperature profile along of the pellet radius during the residence time. The model is a tool to optimize the thermal profile in the induration furnace in order to avoid crack formation and control the mechanical strength of the agglomerate.

关键词： Blast furnaces

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