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.

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.

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

scholarly journals Analysis of Blast Furnace Hearth Sidewall Erosion and Protective Layer Formation

2016 ◽  
Vol 56 (11) ◽  
pp. 1956-1963 ◽  
Author(s):  
Ke-Xin Jiao ◽  
Jian-Liang Zhang ◽  
Zheng-Jian Liu ◽  
Chun-Lin Chen ◽  
Yan-Xiang Liu
Keyword(s):  
Blast Furnace ◽  
Protective Layer ◽  
Layer Formation ◽  
Furnace Hearth ◽  
Blast Furnace Hearth

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

Hot metal flow characteristics and its contribution to hearth erosion in the early stage of blast furnace campaign

2021 ◽  
Vol 118 (4) ◽  
pp. 410
Author(s):  
Lei Zhang ◽  
Jianliang Zhang ◽  
Kexin Jiao ◽  
Xiaoke Zhang ◽  
Sijia Duan ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Early Stage ◽  
Metal Flow ◽  
Flow Characteristics ◽  
Molten Iron ◽  
Hot Metal ◽  
Furnace Hearth ◽  
Utilization Factor ◽  
Furnace Campaign ◽  
Blast Furnace Hearth

Hot metal circulation is one of the most important factors for hearth erosion. In this article, both the production conditions reflected by production parameters and the actual erosion state are considered. A series of cases are set up to analyze the hot metal flow characteristics and its contribution to hearth erosion. The main results are as follow: (1) There are two asymmetric high-speed bands existed on both side of the taphole, which is caused by the inner shape of blast furnace hearth and will cause the erosion of blast furnace hearth. (2) The velocity inside the deadman has an obvious decrease from top to middle part and then keeps almost stable, especially at the edge of deadman. It is caused by the inhibition effect of molten iron flow around deadman, and may result in a slower update rate of deadman in the lower part as well as an increase of carbon unsaturation in the molten iron. (3) The velocity of line 4–5# around the bottom increases with the increasing of daily output, and decreases with the increasing of the depth of salamander. Therefore, in the early stage of the blast furnace campaign, a production process with high utilization factor will increase hearth erosion. (4) The inner shape of hearth and the distance between sidewall and deadman are the main factors affecting the flow rate of molten iron.

CFD Modeling of Skull Formation in a Blast Furnace Hearth

2012 ◽  
Author(s):  
Dong Fu ◽  
Yan Chen ◽  
Chenn Q. Zhou ◽  
Yongfu Zhao ◽  
Louis W. Lherbier ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Blast Furnace ◽  
Cooling Water ◽  
Operating Experience ◽  
Protective Layer ◽  
Cfd Modeling ◽  
Furnace Hearth ◽  
Cooling Water Temperature ◽  
Blast Furnace Hearth ◽  
Skull Formation

The formation of the protective layer of solidified metal (skull) is critical to the blast furnace hearth operation. Enhancement of the formation of the skull layer could extend the hearth lining life and blast furnace campaign. In this paper, a CFD model that consists of solidification, flow, heat transfer has been utilized to simulate the skull formation phenomena in a blast furnace hearth. The heat transfer characteristics and temperature distribution of the skull and refractory brick has been investigated. The simulated results are comparable with operating experience of U. S. Steel blast furnaces. Parametric study includes lining property and structure, cooling water temperature and flow rate, hot metal (HM) temperature and the production rate, as well as cast practice.

Sign in / Sign up

Export Citation Format

Share Document