Analysis of Drainage Rate Variation of Molten Iron and Slag from Blast Furnace during Tapping
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概要
- 論文の詳細を見る
Despite its importance in practical blast furnace (BF) operation, the dominant factors to control drainage rate or tapping time have not been well studied. In most cases, short tapping time has been attributed to rapid tap hole diameter enlargement. On the other hand, the experiential tendency about positive correlation between furnace hearth bottom temperature and drainage rate has been widely recognized.In order to examine the dominant factors to control the liquid drainage rate or tapping time at BF, a simulative calculation model is introduced, where the liquid drainage path consists of coke particles packed layer (coke filter) and tapping hole and the overall drainage rate is determined as one of smaller fluid rate in coke filter or tapping hole. For calculating the fluid rate in coke filter, a hypothesis that liquid iron and slag in coke filter is driven toward the tap hole entry point consuming the coke particles, whose extent depends on molten iron C saturation degree and FeO fraction in molten slag, was introduced.The calculation results present good matches with the observed tapping operation. This result can be explained by the two influences of low permeability zone formation or elimination at furnace hearth. Considering the two influences of low permeability zone formation, (1) to lower hearth bottom temperature and (2) to induce low C saturation of pig iron due to short traveling time in liquid pool to tap hole entry point, the simulation result conforms to the above mentioned experiential tendency.
- 社団法人 日本鉄鋼協会の論文
- 2008-04-15
著者
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Ogura Kazuhiro
Jfe Refractories Corp.
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Ogura Kazuhiro
Material Development Dept. Kawasaki Refractories Co. Ltd.
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Hakone Tetsui
Jfe Refractories Corp.
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Iida Masakazu
Jfe Refractories Corp.
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Iida Masakazu
Materials Development Dept. Jfe Refractories Corporation
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Iida Masakazu
Shinagawa Refractories Co. Ltd.
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Ogura Kazuhiro
Materials Development Dept. Jfe Refractories Corporation
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Hakone Tetsui
Materials Development Dept. Jfe Refractories Corporation
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Iida Masakazu
Research Center Shinagawa Refractories Co. Ltd.
関連論文
- Variation of the Metal / Slag Drainage Rate During Blast Furnace Tapping
- Effect of SiO_2 Content of Mud on Its Bonding
- Influence of SiO_2 Content on Bonding Characteristics of Mud for Blast Furnace Tap Hole
- Development of a High Density Taphole Mud
- Effect of Temperature on the Dissolution Rate of High SiC Castable in Blast Furnace Slag
- Apparent Thermal Conductivity of Green Taphole Mix and Structure Formation of Taphole Plugging Material
- The Apparent Thermal Conductivity of Green Taphole Mix and Structure Formation in a Taphole Plug
- Effect of Al Addition on the Iron Corrosion Resistance of Tap Hole Mixes
- The Effect of NiO Addition on Metal-Line Castable for the Blast Furnace Main Trough
- Evaluation of Shear Load of Rupture of Green Tap Hole Mix
- Numerical Study on Metal/Slag Drainage Rate Deviation during Blast Furnace Tapping
- Evaluation of the Thermal Shock Resistance of Blast Furnace Main Trough Castables
- Influence of Tap Hole Corrosion Characteristics on the Slag Height in a Blast Furnace
- Analysis of Drainage Rate Variation of Molten Iron and Slag from Blast Furnace during Tapping
- Evaluation of the Rheological Properties of Taphole Materials and Estimation of Injection into a Blast Furnace
- Heat Transfer during Drying of Monolithic Refractories
- Effect of SiC Oxidization on Corrosion Resistance of Castable for Metal Line of Blast Furnace Main Trough
- Analysis of the Drilling Behavior of Blast Furnace Tap Hole Mix
- Analysis of Variation in Metal/Slag Drainage Rate among Tap Holes of Blast Furnace
- Evaluation of Rheological Properties of Tap-Hole Materials and Estimation of Injected Condition in the Blast Furnace
- Microstructure of Tap Hole Mix in Contact with Slag and Pig Iron
- Microstructure of Taphole Mix in Contact with Slag
- Influence of Al-containing Components Addition on the Metal Corrosion Resistance of Tap Hole Mixes
- Dissolution of Al_2O_3-SiC-C Castables in Blast Furnace Slag
- Influence of Slag Flow Speed on Corrosion Rate of a Blast Furnace Main Trough