On-Line Detection Research on Temperature of the Blast Furnace Hearth Staves and Bosh

2017 ◽  
Author(s):  
Dong Da-Ming ◽  
Li Li-Rong ◽  
Ju Xiang-Ming ◽  
Sun Yi-Bo ◽  
Sun Cai-Ying
Keyword(s):  
Blast Furnace ◽  
Line Detection ◽  
Furnace Hearth ◽  
Blast Furnace Hearth ◽  
On Line

Effect of titanium on the skull formation of the blast furnace hearth

2020 ◽  
Vol 117 (4) ◽  
pp. 409
Author(s):  
Yan Li ◽  
Tingfang Jian ◽  
Tongxiang Ma ◽  
Meilong Hu ◽  
Leizhang Gao ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Control Mechanism ◽  
Protective Layer ◽  
Molten Iron ◽  
Monitoring And Control ◽  
Furnace Hearth ◽  
Factors Affecting ◽  
Blast Furnace Hearth ◽  
On Line ◽  
And Control

The erosion of the blast furnace hearth has become one of the key factors affecting the life of the blast furnace, because of the limited on-line monitoring and control means in the blast furnace hearth area, the burn-through accidents of the blast furnace hearth and bottom occur occasionally. In this work, based on the self-built platform of heat flow regulation, the control mechanism of the high melting phases of TiC is studied. The on-line control mechanism of the hearth erosion by adding titanium-containing materials was discussed. There are three steps for the on-line control of iromaking using titanium-containing materials in blast furnace. Firstly, Ti(C, N) precipitated from the molten iron due to the decrease of temperature in the erosion zone of the hearth. Secondly, the viscosity of the molten iron increased with the precipitation of Ti(C, N) in the erosional cryogenic zone and temperature further decreasing. Finally, the protective layer, included pig iron matrix and Ti(C, N) solid fulcrum, formed because of the solidification of the molten iron. The protective layer can replace the corroded lining of the blast furnace to prevent its hearth from being eroded.

On-Line Estimation of Liquid Levels in the Blast Furnace Hearth

2018 ◽  
Vol 90 (3) ◽  
pp. 1800420 ◽  
Author(s):  
Mauricio Roche ◽  
Mikko Helle ◽  
Jan van der Stel ◽  
Gerard Louwerse ◽  
Lei Shao ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Furnace Hearth ◽  
Blast Furnace Hearth ◽  
On Line

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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