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| Effect of coke powder and semi-coke on combustion characteristics of blast furnace blended coal |
| PENG Zheng-fu1, ZHANG Jian-liang1, BI Chuan-guang2, NING Xiao-jun1, TAN Pei-long2, WANG Guang-wei1 |
1. School of Metallurgy and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
2. Technology Center, Shanghai Meishan Iron and Steel Co., Ltd., Nanjing 210039, Jiangsu, China |
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Abstract In order to explore the effect of injection of coke and semi-coke instead of anthracite on the combustion of blended coal,using the new blast furnace coal injection combustion simulation experimental device and thermogravimetric analysis equipment, the effects of coke powder, semi-coke and coal blending particle size on the combustion of blended coal were studied. The appearance of unburned coal powder was observed by scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The mechanism and influencing factors of coal blending combustion were analyzed from the perspective of the coal powder combustion process and coal structure. The results show that the particle size reduction has a promoting effect on combustion. The particle size of coke powder used for injection should be less than 0.074 mm. Semi-coke and coke powder have different effects on coal blending, semi-coke has no obvious effect on the replacement of anthracite, but the effect of coke powder is obvious. When the amount of coke powder added exceeds 15%, the combustion performance of the blended coal decreases sharply. The effect of semi-coke and coke breeze on the combustibility of blended coal is different, mainly because of the different chemical properties and structures of semi-coke and coke. Considering the combustion performance of blended coal, it is acceptable to use a small amount of coke powder instead of anthracite for the blast furnace injection.
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Received: 28 February 2019
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|
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巩黎伟.太钢高炉喷吹兰炭煤生产实践[J]. 炼铁, 2018, 37(5):16. (GONG Li-wei. Semi-coke coal injection practice in Taiyuan Steel′s BF[J]. Ironmaking, 2018, 37(5):16.)
|
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|
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|
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CHAI Yi-fan, ZHANG Jian-liang, SHAO Qiu-jun,et al. Experiment research on pulverized coal combustion in the tuyere of oxygen blast furnace[J]. High Temperature Materials and Processes, 2016, 35(1):73.
|
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高鹏, 赵丹宁, 王平, 等. 马钢4 000 m3高炉喷吹煤粉燃烧性能研究与应用[J]. 钢铁, 2018, 53(12):10. (GAO Peng, ZHAO Dan-ning, WANG Ping,et al. Study and application on combustibility of pulverized coal injection at 4 000 m3 BF of Masteel[J]. Iron and Steel, 2018, 53(12):10.)
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2019, Vol. 54 
