Heat Transfer and Metallurgical Reaction of Iron Ore Fines Injected into Raceway of a Small-scale Rot Furnace

Konishi, Yukio; Takeda, Kanji; Taguchi, Sachihiro; Hamada, Takao

doi:10.2355/tetsutohagane1955.73.15_2004

Cited by 1 publication

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“…Moreover extra flux materials injected through the tuyere can decrease flux charge to the top and consequent decrease in the slag formation in the cohesive zone. Several studies have been carried out in order to elucidate the multiple injection phenomena [5][6][7][8][9] and fundamental experiments have been proposed in order to simulate the blast furnace operating with multiple injection. [9][10][11] However, a detailed mathematical model, which is capable of simulating the multiple injection through the blast furnace tuyere, has not yet been reported.…”

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confidence: 99%

Numerical Analysis of Multiple Injection of Pulverized Coal, Prereduced lron Ore and Flux with Oxygen Enrichment to the Blast Furnace.

2001

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This paper introduces a modeling of the co-injection of pulverized coal, pre-reduced iron ore and flux into the blast furnace through the tuyere. This model treats the blast furnace as a multi-phase reactor. The pulverized coal and pre-reduced fine ore/flux have different chemical and thermophysical properties, thus these materials are treated as separate phases. Therefore this model considers six phases: gas, lump solids (iron ore, sinter, pellets and coke), pig iron, molten slag, pulverized coal and pulverized iron ore/flux. Conservation equations for mass, momentum, energy and chemical species are solved simultaneously based on the finite volume approach. Two operational practices are investigated. One is the injection of pre-reduced fine iron ore and pulverized coal, and the other is the co-injection of pre-reduced fine ore, flux and pulverized coal. The simulation results have contributed to better understanding the blast furnace phenomena with multiple injectants, and supported new improvements in the blast furnace operation. With this model, the injection of pulverized iron ore and flux together with pulverized coal has been proved to be possible at high rates keeping stable blast furnace operation. Moreover, the silicon content can be lowered and the furnace productivity can be largely increased.KEY WORDS: blast furnace; mathematical model; multi-phase flow; pulverized coal injection; iron ore injection; flux injection. and the effects of this method were examined. Mathematical Model General Conservation EquationThe mathematical model is two dimensional and axisymmetric. It analyses the packed bed region within the blast furnace, from the surface of the slag in the hearth up to the burden surface in the throat. Unlike previous model, 12,13) this model handles pulverized coal and pre-reduced fine ore/flux as different phases. Therefore, in order to simulate multiple injection the model considers six phases in the packed bed, namely, gas, solids, hot metal, molten slag, pulverized coal and pre-reduced fine ore/flux. Each phase consists of one or more components having its own composition and physical properties. All phases are treated at the same time because those phases interact with one another. Thus the governing equations of all materials, that form a large set of strongly coupled equations, are solved simultaneously. In this model conservation equations for the prereduced fine ore/flux are newly introduced to describe the fields of velocity, volume fraction, chemical species and energy for this new phase.Governing conservation equations for all phases are expressed via a general equation, represented by Eq (1), which is independent of the coordinate system.In this equation i represents the phase being considered. The complete set of chemical species for each phase considered in this model is summarized in Table 1. The other variables considered are the phase velocity components, pressure or volume fraction and energy. The source terms are due to inter-phase interactions that can be through chemical r...

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