고로하부 액체유동에 대한 수치해석 사례 - 냉간유동
Numerical simulation of the liquid flow in the lower part of the blast furnace - A cold flow case
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초록
The high permeability of the gas in the molten iron of the dripping zone of the blast furnace is a major factor in achieving the stable operation of a furnace with high productivity. Basic studies of the liquid flow behavior in a packed bed are necessary to grasp the effect of various operational changes on conditions in the dropping zone. Molten iron and slag together play a critical role in the lower zone, transporting mass and energy, while impairing and redistributing the gas flow. In turn, molten iron and slag undergo physical and chemical changes, and are redistributed radially as they descend to the hearth.In this research, mathematical formulations are derived for the gas and the liquid. The solid phase is fixed with constant porosity. The information for the molten iron and slag includes the hold-up, velocity, pressure, and information related to the areas of interaction between the gas and the liquid, and the solid and the liquid. Predictable results include the velocity, pressure and temperature distribution. Additional parameters include the packed particle size and the air blast rate.
Abstract
The high permeability of the gas in the molten iron of the dripping zone of the blast furnace is a major factor in achieving the stable operation of a furnace with high productivity. Basic studies of the liquid flow behavior in a packed bed are necessary to grasp the effect of various operational changes on conditions in the dropping zone. Molten iron and slag together play a critical role in the lower zone, transporting mass and energy, while impairing and redistributing the gas flow. In turn, molten iron and slag undergo physical and chemical changes, and are redistributed radially as they descend to the hearth.In this research, mathematical formulations are derived for the gas and the liquid. The solid phase is fixed with constant porosity. The information for the molten iron and slag includes the hold-up, velocity, pressure, and information related to the areas of interaction between the gas and the liquid, and the solid and the liquid. Predictable results include the velocity, pressure and temperature distribution. Additional parameters include the packed particle size and the air blast rate.
참고문헌 (11)
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- J. Yagi, "Mathematical modeling of the flow of four fluids in a packed bed", ISIJ int, 33, pp.619~ (1993)
- H. Kawabata, "Characteristics of Liquid Hold-ups in a Soaked and Unsoaked Fixed Bed", ISIJ, 45, pp.1466~ (2005)
- J. Szekely, , Trans. Iron Steel Inst. Jpn, 19, pp.76~ (1979)
- T. Sugiyama, "Analysis on Liquid flow in the dripping zone of blast furnace", 鉄 と 鋼, 15 (1987)
- M. Niu, "Development of measuring method and a fixed quantity for wetted area between liquid and particles in a packed bed for iron making", 鉄 と 鋼, 82, pp.13~ (1996)
- Y. Eto, "Experiments and simulation of the liquid flow in the dropping zone of a blast furnace", ISIJ int, 33, pp.681~ (1993)
- Y. Bando, "Effects of Packed Structure and Liquid Properties on Liquid Flow Behavior in Lower Part of Blast Furnace", ISIJ int, 45, pp.1461~ (2005)
- G. X. Wang, "Simulation of Gas–Liquid Flow in Dripping Zone of Blast Furnace Involving Impermeable Fused Layers", ISIJ int, 40, pp.627~ (2000)
- G. S. Gupta, "Model Studies of Liquid Flow in the Blast Furnace Lower Zone", ISIJ int, 36, pp.32~ (1996)
- M. Niu, "Reduction of the wall effect in a packed bed by a hemispherical lining", AIChe J, 42, pp.1181~ (1996)