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 Experimental and Numerical Investigation of Reaction Behavior of Carbon Composite Briquette in Blast Furnace

Metals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 49 ◽  
Author(s):  
Huiqing Tang ◽  
Yanjun Sun ◽  
Tao Rong
Keyword(s):  
Blast Furnace ◽  
Numerical Simulations ◽  
Numerical Study ◽  
Carbon Composite ◽  
Reaction Model ◽  
Reaction Behavior ◽  
Carbon Gasification ◽  
Reduction Of Iron ◽  
Gasification Of Carbon ◽  
Experimental Findings

The application of carbon composite briquette (CCB) is considered to be an efficient method for achieving low-energy and low-CO2-emission blast furnace (BF) operations. In this research, a combined experimental and numerical study was conducted on the CCB reaction behavior in BF. The CCB used in this study had a composition of 20.10 wt.% carbon, 29.70 wt.% magnetite, 39.70 wt.% wüstite, and 1.57 wt.% metallic iron. Using the prepared CCB samples, isotherm reduction tests under a simulated BF atmosphere (CO-CO2-N2) were conducted and a reaction model was developed. Subsequently, the reaction behavior of CCB along the mid-radial solid descending path in an actual BF of 2500 m3 was analyzed by numerical simulations based on the experimental findings and the previous results of comprehensive BF modeling. The results of the experiments showed that the CCB model predictions agreed well with the experimental measurements. With respect to the BF, the results of the numerical simulations indicated that, along the path, before the CCB temperature reached 1000 K, the CCB was reduced by CO in the BF gas; when its temperature was in the range from 1000 to 1130 K, it underwent self-reduction and contributed both CO and CO2 to the BF gas; when its temperature was above 1130 K, it only presented carbon gasification. Moreover, these results also revealed that the reduction of iron oxide and the gasification of carbon inside the CCB proceeded under an uneven mode. The uneven radial distribution of the local reduction fraction and local carbon conversion were evident in the self-reducing stage of the CCB.

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.

scholarly journals Reaction Model and Reduction Behavior of Carbon Iron Ore Composite in Blast Furnace

2009 ◽  
Vol 49 (6) ◽  
pp. 827-836 ◽  
Author(s):  
Shigeru Ueda ◽  
Kazunari Yanagiya ◽  
Kentaro Watanabe ◽  
Taichi Murakami ◽  
Ryo Inoue ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Iron Ore ◽  
Reaction Model ◽  
Reduction Behavior ◽  
Carbon Iron

scholarly journals Effect of Iron Ore and Coal Properties on Reaction Behavior of Carbon Composite Iron Ore Briquette

2009 ◽  
Vol 95 (6) ◽  
pp. 453-459 ◽  
Author(s):  
Yasuaki Ueki ◽  
Koji Osuga ◽  
Ko-ichiro Ohno ◽  
Takayuki Maeda ◽  
Koki Nishioka ◽  
...  
Keyword(s):  
Iron Ore ◽  
Carbon Composite ◽  
Reaction Behavior ◽  
Coal Properties
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