Study on the Formation Mechanism of Gas Gap in Blast Furnace Hearth

2020 ◽  
Author(s):  
J. Xu ◽  
M. Chen ◽  
Z. Zou
Keyword(s):  
Blast Furnace ◽  
Formation Mechanism ◽  
Furnace Hearth ◽  
Blast Furnace Hearth ◽  
Gas Gap

Formation mechanism of the protective layer in a blast furnace hearth

2015 ◽  
Vol 22 (10) ◽  
pp. 1017-1024 ◽  
Author(s):  
Ke-xin Jiao ◽  
Jian-liang Zhang ◽  
Zheng-jian Liu ◽  
Meng Xu ◽  
Feng Liu
Keyword(s):  
Blast Furnace ◽  
Formation Mechanism ◽  
Protective Layer ◽  
Furnace Hearth ◽  
Blast Furnace Hearth

Characterization and formation mechanism of graphite-rich iron protective layer in blast furnace hearth

Fuel ◽  
2021 ◽  
Vol 306 ◽  
pp. 121665
Author(s):  
Kexin Jiao ◽  
Guangxiang Feng ◽  
Jianliang Zhang ◽  
Hengbao Ma ◽  
Ziyu Guo
Keyword(s):  
Blast Furnace ◽  
Formation Mechanism ◽  
Protective Layer ◽  
Furnace Hearth ◽  
Blast Furnace Hearth

Corrosion mechanism of carbon brick in the blast furnace hearth by potassium

2017 ◽  
Vol 115 (1) ◽  
pp. 109 ◽  
Author(s):  
Ke-xin Jiao ◽  
Jian-liang Zhang ◽  
Zheng-jian Liu ◽  
Zhuang-zhuang Liu ◽  
Yong Deng ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Formation Mechanism ◽  
Significant Role ◽  
Volume Expansion ◽  
Reaction Times ◽  
Experimental Results ◽  
Corrosion Mechanism ◽  
Furnace Hearth ◽  
Blast Furnace Hearth ◽  
Brittle Layer

Alkali plays a significant role in the formation of brittle layer of carbon brick in the blast furnace hearth. The brittle layer in a commercial blast furnace hearth was investigated. Large amounts of potassium compounds were found in the brittle layer. Subsequently, the carbon bricks which reacted with potassium in the simulation of blast furnace hearth under different contents of potassium in the brick (0.25, 0.5, 1.0 and 2.0 wt.%) during various reaction times (0.5, 1, 2 and 4 h) were experimentally studied. Finally, the formation mechanism of the brittle layer in carbon brick was clarified. The investigation results show that a large number of cracks are present in the brittle layer. The average potassium content in the brittle layer is 1 wt.%. According to the experimental results, cracks in the carbon brick can be formed by the attack of potassium. The reason for the formation of the brittle layer in the carbon brick is that the liquid potassium permeates into the carbon brick through the pores and cracks, and then reacts with SiO2 and Al2O3 in CO atmosphere. The generated potassium compounds nepheline and leucite lead to the volume expansion and the damage of the carbon brick.

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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