scholarly journals Optimization of Blast Furnace Throughput Based on Hearth Refractory Lining and Shell Thickness

2021 ◽  
Vol 5 (1) ◽  
pp. 5-13
Author(s):  
Chinwuba Victor Ossia ◽  
Mathew Uzoma Shedrack
Keyword(s):  
Silicon Carbide ◽  
Blast Furnace ◽  
Refractory Lining ◽  
Carbon Composite ◽  
High Alumina ◽  
Steel Shell ◽  
Slag Production ◽  
Temperature Levels ◽  
Computational Analyses ◽  
Thermal Conductivities

Computational analyses were performed to optimize the furnace throughput, steel shell and lining thickness of a blast furnace. The computations were done for measured parameters within the hearth region as this is the vital zone of the furnace with high temperature fluctuations, molten iron, and slag production. The lining materials were namely 62% high alumina (A), carbon composite (B), silicon carbide (C) and graphite bricks (D) with thermal conductivities 2, 12, 120 and 135 W/(m∙K), respectively. It was observed that by varying the refractory lining thickness from 0.2–0.35 m, and furnace inside temperatures from 1873–2073 K, certain optimal conditions could be specified for the furnace under consideration. Silicon carbide and graphite brick linings which have higher thermal conductivities, melting points, good chemical and mechanical wear resistance were observed to be the best hearth lining materials. Due to the high thermal conductivities of these two materials, the hot face temperature levels of the lining materials would be lowered. Amongst the four lining materials employed, silicon carbide and graphite bricks when used with lining cooling systems could optimize the blast furnace for better performance, production, and longer campaigns.

Measurement of erosion state and refractory lining thickness of blast furnace hearth by using three-dimensional laser scanning method

2020 ◽  
Vol 118 (1) ◽  
pp. 106
Author(s):  
Lei Zhang ◽  
Jianliang Zhang ◽  
Kexin Jiao ◽  
Guoli Jia ◽  
Jian Gong ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Laser Scanning ◽  
Refractory Lining ◽  
Three Dimensional ◽  
3D Laser Scanning ◽  
Scanning Method ◽  
Blast Furnace Production ◽  
Severe Erosion ◽  
Residual Thickness ◽  
Minimum Depth

The three-dimensional (3D) model of erosion state of blast furnace (BF) hearth was obtained by using 3D laser scanning method. The thickness of refractory lining can be measured anywhere and the erosion curves were extracted both in the circumferential and height directions to analyze the erosion characteristics. The results show that the most eroded positions located below 20# tuyere with an elevation of 7700 mm and below 24#–25# tuyere with an elevation of 8100 mm, the residual thickness here is only 295 mm. In the circumferential directions, the serious eroded areas located between every two tapholes while the taphole areas were protected well by the bonding material. In the height directions, the severe erosion areas located between the elevation of 7600 mm to 8200 mm. According to the calculation, the minimum depth to ensure the deadman floats in the hearth is 2581 mm, corresponding to the elevation of 7619 mm. It can be considered that during the blast furnace production process, the deadman has been sinking to the bottom of BF hearth and the erosion areas gradually formed at the root of deadman.

Reduction behavior of vanadium-titanium magnetite carbon composite hot briquette in blast furnace process

2019 ◽  
Vol 342 ◽  
pp. 214-223 ◽  
Author(s):  
Wei Zhao ◽  
Mansheng Chu ◽  
Hongtao Wang ◽  
Zhenggen Liu ◽  
Jue Tang ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Carbon Composite ◽  
Blast Furnace Process ◽  
Reduction Behavior ◽  
Furnace Process ◽  
Vanadium Titanium ◽  
Titanium Magnetite

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.

Corrosion Activity of Alkali-Containing Slags With Respect to a Blast Furnace Refractory Lining

2013 ◽  
Vol 54 (3) ◽  
pp. 155-159 ◽  
Author(s):  
D. N. Togobitskaya ◽  
A. F. Khamkhot’ko ◽  
N. A. Tsivataya ◽  
D. A. Stepanenko
Keyword(s):  
Blast Furnace ◽  
Refractory Lining ◽  
Corrosion Activity

Wear mechanism for blast furnace hearth refractory lining

2005 ◽  
Vol 32 (6) ◽  
pp. 459-467 ◽  
Author(s):  
S. N. Silva ◽  
F. Vernilli ◽  
S. M. Justus ◽  
O. R. Marques ◽  
A. Mazine ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Wear Mechanism ◽  
Refractory Lining ◽  
Furnace Hearth ◽  
Blast Furnace Hearth

Reaction model and reaction behavior of carbon composite briquette in blast furnace

2021 ◽  
Vol 377 ◽  
pp. 832-842
Author(s):  
Huiqing Tang ◽  
Yanjun Sun ◽  
Tao Rong ◽  
Zhancheng Guo
Keyword(s):  
Blast Furnace ◽  
Carbon Composite ◽  
Reaction Model ◽  
Reaction Behavior

scholarly journals CFD Simulations of Radiative Heat Transport in Open-Cell Foam Catalytic Reactors

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 716 ◽  
Author(s):  
Christoph Sinn ◽  
Felix Kranz ◽  
Jonas Wentrup ◽  
Jorg Thöming ◽  
Gregor D. Wehinger ◽  
...  
Keyword(s):  
Thermal Radiation ◽  
Heat Transport ◽  
Dry Reforming Of Methane ◽  
Small Scale ◽  
Catalytic Reactors ◽  
Open Cell ◽  
Open Cell Foam ◽  
Temperature Levels ◽  
Cell Foam ◽  
Thermal Conductivities

The heat transport management in catalytic reactors is crucial for the overall reactor performance. For small-scale dynamically-operated reactors, open-cell foams have shown advantageous heat transport characteristics over conventional pellet catalyst carriers. To design efficient and safe foam reactors as well as to deploy reliable engineering models, a thorough understanding of the three heat transport mechanisms, i.e., conduction, convection, and thermal radiation, is needed. Whereas conduction and convection have been studied extensively, the contribution of thermal radiation to the overall heat transport in open-cell foam reactors requires further investigation. In this study, we simulated a conjugate heat transfer case of a µCT based foam reactor using OpenFOAM and verified the model against a commercial computational fluid dynamics (CFD) code (STAR-CCM+). We further explicitly quantified the deviation made when radiation is not considered. We studied the effect of the solid thermal conductivity, the superficial velocity and surface emissivities in ranges that are relevant for heterogeneous catalysis applications (solid thermal conductivities 1–200 W m−1 K−1; superficial velocities 0.1–0.5 m s−1; surface emissivities 0.1–1). Moreover, the temperature levels correspond to a range of exo- and endothermal reactions, such as CO2 methanation, dry reforming of methane, and methane steam reforming. We found a significant influence of radiation on heat flows (deviations up to 24%) and temperature increases (deviations up to 400 K) for elevated temperature levels, low superficial velocities, low solid thermal conductivities and high surface emissivities.

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