Aspects of blast-furnace hearth maintenance in the smelting of a titanomagnetite charge under unstable operating conditions

Metallurgist ◽  
1998 ◽  
Vol 42 (3) ◽  
pp. 86-90
Author(s):  
G. G. Gavrilyuk ◽  
Yu. A. Lekontsev ◽  
S. D. Abramov ◽  
V. A. Zavidonskii
Keyword(s):  
Blast Furnace ◽  
Operating Conditions ◽  
Furnace Hearth ◽  
Blast Furnace Hearth

Numerical Investigation on Cooling Strategies in a Commercial Blast Furnace Hearth

2004 ◽  
Author(s):  
Anil K. Patnala ◽  
Chenn Q. Zhou ◽  
Yongfu Zhao
Keyword(s):  
Blast Furnace ◽  
Cooling Water ◽  
Operating Conditions ◽  
Cfd Modeling ◽  
Dominant Factor ◽  
Furnace Hearth ◽  
Blast Furnace Hearth ◽  
Campaign Life ◽  
Parametric Effects ◽  
Flow Heat

A blast furnace is the predominant iron-producing process in the U.S. It is widely believed that the blast furnace hearth refractory is the most dominant factor affecting the campaign life of a blast furnace. The hearth, where the liquid metal is collected, is made of carbon bricks. Cooling water is normally applied to the outside wall of the hearth. Wear of the carbon refractory occurs primarily because of erosion, which is related to the operating conditions of the hearth, such as the liquid flow in the hearth and the heat duty to the walls. Evaluation of fluid flow, heat transfer, and erosion patterns in the hearth are critical to the extension of the campaign life of a blast furnace, leading to the increase of productivity and saving of costs significantly. Advanced computational fluid dynamics (CFD) modeling techniques make it possible for providing detailed information on furnace conditions and parametric effects on performance. In this research, the blast furnace No. 13 at U.S Steel has been simulated using a comprehensive CFD model. The model was validated using the temperatures measured by thermocouples in the wall refractories of the furnace. The effects of cooling water on the temperature distributions as well as erosion patterns were evaluated. The results provide useful information for the furnace operations.

Computational Fluid Dynamics Analysis of 3D Hot Metal Flow Characteristics in a Blast Furnace Hearth

2010 ◽  
Vol 2 (1) ◽  
Author(s):  
Chenn Q. Zhou ◽  
D. (Frank) Huang ◽  
Yongfu Zhao ◽  
Pinakin Chaubal
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Blast Furnace ◽  
Metal Flow ◽  
Measurement Data ◽  
Operating Conditions ◽  
Hot Metal ◽  
Furnace Hearth ◽  
Blast Furnace Hearth ◽  
Computational Fluid Dynamics Analysis

The campaign life of an iron blast furnace depends on hearth wear. Distributions of liquid iron flow and refractory temperatures have a significant influence on hearth wear. A 3D comprehensive computational fluid dynamics model has been developed specifically for simulating the blast furnace hearth. It includes both the hot metal flow and the conjugate heat transfer through the refractories. The model has been extensively validated using measurement data from Mittal Steel old, new IH7 blast furnace and U.S. Steel 13 blast furnace. Good agreements between measured and calculated refractory temperature profiles have been achieved. It has been used to analyze the velocity and temperature distributions and wear patterns of different furnaces and operating conditions. The results can be used to predict the inner profile of hearth and to provide guidance for protecting the hearth.

Occurrence state and Behavior of Carbon Brick Brittle in a Large Dissected Blast Furnace Hearth

2021 ◽  
Author(s):  
Ziyu Guo ◽  
Jianliang Zhang ◽  
Kexin Jiao ◽  
Yanbing Zong ◽  
Zhongyi Wang
Keyword(s):  
Blast Furnace ◽  
Furnace Hearth ◽  
Blast Furnace Hearth ◽  
Occurrence State ◽  
And Behavior

A Model to Simulate Titanium Behavior in the Iron Blast Furnace Hearth

2010 ◽  
Vol 41 (4) ◽  
pp. 876-885 ◽  
Author(s):  
Bao-Yu Guo ◽  
Paul Zulli ◽  
Daniel Maldonado ◽  
Ai-Bing Yu
Keyword(s):  
Blast Furnace ◽  
Furnace Hearth ◽  
Blast Furnace Hearth ◽  
Iron Blast Furnace

scholarly journals Monitoring Liquid Level of Blast Furnace Hearth and Torpedo Ladle by Electromotive Force Signal

Metals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 665 ◽  
Author(s):  
Ying Li ◽  
Lei Zan ◽  
Yao Ge ◽  
Han Wei ◽  
Zhenghao Zhang ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Electromotive Force ◽  
Thermal State ◽  
Single Layer ◽  
Graphite Crucible ◽  
The State ◽  
Liquid Level ◽  
Double Layers ◽  
Furnace Hearth ◽  
Blast Furnace Hearth

The state of a blast furnace hearth, especially the liquid level of hot metal and slag during the tapping process, is of crucial importance with respect to a long campaign blast furnace. In practice, the state of the hearth is evaluated mainly by the experience of operators. In this paper, the electromotive force (EMF) is used to monitor the liquid level of a laboratory scale of blast furnace hearth and the effect of liquid level, EMF sensors position and the thickness of refractory on EMF signals are tested using a single layer of water and double layers of water and oil. After laboratory experiments, the electromotive force (EMF) is used to monitor the liquid level of torpedo ladle successfully. Laboratory experimental results show that the change in liquid level can be characterized by EMF signal. The state of liquid surface and local thermal state cause the EMF signal to vary in the circumferential direction of the vessel. Furthermore, the EMF signal magnitude decreases with the decrease of the thickness of the graphite crucible. Finally, the main conclusions of the laboratory experiment are supported by the torpedo ladle experiment.

scholarly journals Dissection Investigation of Ti(C,N) Behavior in Blast Furnace Hearth during Vanadium Titano-magnetite Smelting

2017 ◽  
Vol 57 (1) ◽  
pp. 48-54 ◽  
Author(s):  
Kexin Jiao ◽  
Jianliang Zhang ◽  
Zhengjian Liu ◽  
Shibo Kuang ◽  
Yanxiang Liu
Keyword(s):  
Blast Furnace ◽  
Furnace Hearth ◽  
Blast Furnace Hearth

scholarly journals Properties and application of carbon composite brick for blast furnace hearth

2015 ◽  
Vol 51 (2) ◽  
pp. 143-151 ◽  
Author(s):  
K.X. Jiao ◽  
J.L. Zhang ◽  
Z.J. Liu ◽  
Y.G. Zhao ◽  
X.M. Hou
Keyword(s):  
Blast Furnace ◽  
Chemical Composition ◽  
Raw Materials ◽  
Protective Layer ◽  
Silicon Powder ◽  
Slag Layer ◽  
Carbon Composite ◽  
Carbon Layer ◽  
Furnace Hearth ◽  
Blast Furnace Hearth

A type of carbon composite brick was produced via the microporous technique using natural flack graphite, ?-Al2O3 and high-quality bauxite chamotte (Al2O3?87 mass%) as raw materials with fine silicon powder as additive. The composition and microstructure of the obtained carbon composite were characterized using chemical analysis, XRD and SEM with EDS. The high temperature properties of thermal conductivity, oxidization and corrosion by molten slag and hot metal of the composite were analyzed. Based on these, the type of carbon composite brick worked in a blast furnace hearth for six years was further sampled at different positions. The protective layer was found and its chemical composition and microscopic morphology were investigated. It is found that the carbon composite brick combines the good properties of both the conventional carbon block and ceramic cup refractory. The protective layer near the hot face consists of two separated sublayers, i.e. the slag layer and the carbon layer. A certain amount of slag phase is contained in the carbon layer, which is caused by the reaction of coke ash with the refractory. No obvious change in the chemical composition of the protective layer along the depth of the sidewall is found. This work provides a useful guidance for the extension of the lifetime of blast furnace hearths.

Thermal Stress of Blast Furnace Hearth Linings under Erosion State

2009 ◽  
Vol 16-19 ◽  
pp. 1101-1105 ◽  
Author(s):  
Liang Yu Chen ◽  
Yu Li ◽  
Jian Hua Gui
Keyword(s):  
Blast Furnace ◽  
Thermal Stress ◽  
Thermal Stresses ◽  
Convective Heat Transfer Coefficient ◽  
Calculation Model ◽  
Furnace Hearth ◽  
Blast Furnace Hearth ◽  
Cooling Intensity ◽  
Thermal Stress Concentration ◽  
Long Life

The structure of cooling stave was simplified with equivalent convective heat transfer coefficient, and the thermal stress axisymmetric calculation model of blast furnace hearth linings under erosion state was established. The thermal stresses of familiar erosion states were analyzed. The thermal stress concentration of erosion part is an importance cause of erosion development. ‘Elephant-foot’ erosion seldom develops to ‘boiler-bottom’ erosion. ‘Boiler-bottom’ erosion is a ideal long life erosion state. When the erosion stabilizes, smaller cooling intensity is favorable to linings stabilization.

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