|
|
|
| Effect of BF Operation on Hearth Erosion |
| DU Ping,LEI Ming,LIU Jian-bo,TAGUCHI Seiji |
| Institute of Research of Iron and Steel, Shasteel, Zhangjiagang 215625, Jiangsu, China |
|
|
|
|
Abstract No.1 BF in Hongfa Iron Making Plant was relined in Jan 2011 due to serious hearth erosion. The 6th and 7th layers carbon bricks in the hearth suffered most serious erosion, showing abnormal triangle erosion line. By analyzing the carbon bricks and simulating the operation condition of hearth, high zinc input and circumferential flow of molten iron are confirmed to be the main reasons for the accelerated hearth erosion. Zinc input to the No.1 BF in Hongfa Iron Making Plant was too high, which resulted in the decrease of thermal conductivity and increase of thermal expansion coefficient of carbon brick, and thus accelerated the melting corrosion and thermal stress erosion of carbon bricks. On the other hand, the short tapping hole, small coke free zone and low permeability of dead man caused by raw material quality and BF operation also accelerated the melting corrosion of hearth by circumferential flow of molten iron. The erosion can be improved by decreasing zinc input to BF, increasing the length of tapping hole, controlling the size of deadman, improving coke quality and selecting proper PCI.
|
|
Received: 28 March 2012
Published: 14 January 2013
|
|
|
|
| [1] |
YAN Xue-qiang1,2,ZHENG Wan1,2,WANG Guo-wei1,2,YAN Wen1,LI Guang-qiang1,2. Effect of microporous MgO refractories on steel cleanliness[J]. JOURNAL OF IRON AND STEEL RESEARCH , 2020, 32(6): 483-490. |
| [2] |
WANG Kun1,LIU Xiao-jie1,LIU Er-hao2,LI Hong-yang1,LIU Song1,LV Qing1. Core temperature prediction model based on AdaBoost algorithm[J]. JOURNAL OF IRON AND STEEL RESEARCH , 2020, 32(5): 363-369. |
| [3] |
WEN Xu1,ZOU Zhong-ping2,JIANG Hua3,WANG Wei4,ZHENG Shao-bo1,YU Zhong-da1. Composition analysis and thermal conductivity measurement of iron skull in blast furnace hearth[J]. JOURNAL OF IRON AND STEEL RESEARCH , 2019, 31(9): 779-786. |
| [4] |
WEN Xu, JIANG Hua, CAO Jin, WANG Wei, XU Run-sheng, YU Zhong-da. Measurement of thermal conductivity for iron skull of blastfurnace hearth and modification of heat transfer model[J]. JOURNAL OF IRON AND STEEL RESEARCH , 2019, 31(4): 347-353. |
| [5] |
SONG Yang， DI Zhan-xia， LIU Ying， LONG Hong-ming， WANG Ping. Deadman status and its influence on hot metal flow in blast furnace hearth[J]. Iron and Steel, 2019, 54(3): 23-28,34. |
| [6] |
WEN Xu1,ZOU Zhong-ping2,JIANG Hua3,WANG Wei4,ZHENG Shao-bo1,YU Zhong-da1. Carburization mechanism of molten ironslag passing through coke bed[J]. JOURNAL OF IRON AND STEEL RESEARCH , 2019, 31(10): 867-874. |
|
|
|
|
2012, Vol. 47 
