Erosion Mechanism of Carbon Brick in Hearth of 4000 m3 Industrial Blast Furnace
Abstract
:1. Introduction
2. Sampling and Analysis
2.1. General Situation of Blast Furnace
2.2. Introduction of Sampling
2.3. Analytical Methods
3. Results and Discussion
3.1. Investigation of the Carbon Bricks after Service
3.2. Calculation of Convective Heat Transfer Coefficient of Carbon Brick
3.3. Erosion of Molten Iron to Carbon Brick
3.4. Analysis of Carbon Brick Erosion Mechanism
3.5. Suggestions for Operation and Construction of BF
- Since the molten iron in the BF is unsaturated in carbon, the carbon content in the carbon brick will dissolve with the molten iron. Therefore, it is possible to try to use ‘B’ carbon bricks [29] (carbon bricks with carbon content lower than ‘A’) instead of A carbon bricks in the hearth sidewall area.
- The molten iron may enter the depth of the carbon brick along the cracks and pores. Therefore, the sidewall of the hearth may be replaced by ultra-micro-porous carbon bricks.
- Because the convective heat transfer coefficient has a significant effect on the formation of “elephant foot” erosion, increasing the depth of the salamander so that the deadman does not contact the bottom of the BF will reduce its impact [22].
- Reducing the Zn of raw materials into the furnace will appropriately increase the temperature of the BF so that the zinc evaporates, moves upward, and generates ZnO, which is discharged with the furnace dust [7].
4. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Parameter | C | ZnO | SiO2 | K2O | Al2O3 | Fe2O3 | Na2O | Cl |
---|---|---|---|---|---|---|---|---|
Sample 1 | 22.25 | 69.69 | 2.14 | 1.71 | 0.76 | 1.69 | 0.27 | 0.3 |
Sample 2 | 83.84 | 3.34 | 6.24 | 0.24 | 1.29 | 3.03 | 0.12 | 0.05 |
Parameter | Unit | Value | Parameter | Unit | Value |
---|---|---|---|---|---|
μ | Pa·s | 6.0 × 10−3 | L | m | 3 |
η | t/(d·m3) | 2.26 | θ | ° | 10 |
ρ | Kg/(m3) | 6680 | α | ° | 45 |
Cp | J/(kg·K) | 610 | d1 | m | 13.5 |
W/(m·K) | 6.88 | T d2 | m | 10.5 | |
V | m3 | 4000 | L0 | m | 1.6 |
R | J/(mol·K) | 8.314 | ∆h | m | 0.71 |
ε | - | 0.3 | v | m | 2.76 × 10−4 |
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Cao, J.; Zhang, J.; Wang, C.; Deng, Y.; Zhang, G.; Song, M. Erosion Mechanism of Carbon Brick in Hearth of 4000 m3 Industrial Blast Furnace. Metals 2023, 13, 1371. https://doi.org/10.3390/met13081371
Cao J, Zhang J, Wang C, Deng Y, Zhang G, Song M. Erosion Mechanism of Carbon Brick in Hearth of 4000 m3 Industrial Blast Furnace. Metals. 2023; 13(8):1371. https://doi.org/10.3390/met13081371
Chicago/Turabian StyleCao, Jian, Jianliang Zhang, Cui Wang, Yong Deng, Guohua Zhang, and Mingbo Song. 2023. "Erosion Mechanism of Carbon Brick in Hearth of 4000 m3 Industrial Blast Furnace" Metals 13, no. 8: 1371. https://doi.org/10.3390/met13081371