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최상민(Sangmin Choi),양광혁(Kwangheok Yang),정진경(Jinkyung Chung) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Analysis of the internal state of the blast furnace is needed to predict and control the operating condition. In previous study, generalized concept of solid fuel combustion was introduced for analysis of iron-making processes such as coking process and iron ore sintering process. Blast furnace would be modeled by similar approach with counter-current moving bed reactor. In this study, an axi-symmetric 2-dimensional steady state model is proposed to simulate blast furnace process. In this model, two phases such as solid (coke and ore) and gas are considered. Layer structure and shape of deadman are assumed to be fixed. Finite volume method is used for numerical simulation. Because CZ is changed by solid temperature range, whole calculation procedure is iterated until CZ is converged. Through this approach, shape of CZ, velocity, composition and temperature within the furnace are predicted by model.
Kwangheok Yang(양광혁),Sangmin Choi(최상민),Jinkyung Chung(정진경) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
A blast furnace can be modeled in a similar approach using a counter-current bed reactor. In the present study, an axi-symmetric two-dimensional steady state model is proposed to simulate the blast furnace process. It is assumed that only two phases (solid and gas phases) exist in the furnace. The charging material is treated as porous media constructed by coke and ore layers. The internal gas flow of the furnace is controlled by burden distribution owing to the different permeability of the two layers. For an understanding of the influence of the burden distribution on the operating conditions, the entire layer structure is predicted from the measured top layer structure and the solid flow is assumed according to the potential flow. Using this burden distribution, the flow, energy, and chemical species conservation equations are considered for each phase. In addition, the mass generation/consumption according to the reaction, heat transfer between the gas and the solid phases, and the reaction heat are reflected by source terms in the governing equations. For several Lo/Lc (layer thickness ratio of ore and coke layer) cases, layer structures are constructed and numerical simulations are conducted. The finite volume method was used for the numerical simulations. Through this approach, the flow, composition and temperature within the furnace are predicted by the model.