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| KINETICS OF COMBUSTION OF PULVERIZED COAL IN RACEWAY BEFORE TUYERE OF BLAST FURNACE |
| YANG Yongyi; YANG Yanhui (Beijing University of Iron and Steel Technology) |
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Cite this article:
YANG Yongyi; YANG Yanhui (Beijing University of Iron and Steel Technology). KINETICS OF COMBUSTION OF PULVERIZED COAL IN RACEWAY BEFORE TUYERE OF BLAST FURNACE. Acta Metall Sin, 1986, 22(2): 93-106.
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Abstract The combustion efficiency study was made of the partially burnt Purverizeb coal, sampled from the raceway before the tuyere of blast furnace either No.9 of AISC or No.2 of SISC. Results showed that the injected coal started to volatilize and burn just it has entered the blowpipe where seems to be an important preheating and precombustion space before the raceway, however, it could not be completely burnt out there in front of tuyere. In order to replace more coke by injecting more coal, the laboratory simulation test on the combustion kinetics of the pulverized coal used by the above-mentioned two blast furnaces under conditions prior to tuyeres indicated technically possible by: pulverizing the coal down to 40 μm; enriching the blast with oxygen up to 30-40%; further raising the blast temperature; improving the injected coal distribution early in blowpipe; consistently injecting the coal at all tuyeres and selecting the variaty of coal of better combustibility, e.g., bituminous coal being superior to anthracite. Petrographic observation on coal samples prior to injection and after being partially burnt revealed that the bituminous coal burns violently and simultaneously not only on the surface but also in the interior of its particles, while the anthracite, especially, of SISC, mostly on the surface. Based on the theory of heat-transfer and mass-transfer, a set of mathematical model for combustion of pulverized coal has been derived. By substituting the combustion conditions of both above-mentioned two blast furnaces and laboratory test furnace into the model and with the aid of computer, a close approximation to the practice was obtained.
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Received: 18 February 1986
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1 Gao Bocong; Wei Shengming; Qi Zongda, The Technique of Coal Powder Injection on BF of SISC, p. 8． Preprint of Conf. on Direct Use of Coal in Iron and Steelmaking, The Metals Society, Oct. 1982, London.
2 杨彦慧,北京钢铁学院研究生论文,1984,5月.
3 日本钢管,私人材料.
4 杨永宜,高炉喷吹煤粉的几个基本问题,北京钢铁学院,未公开发表资料,1964．
5 Van Heek, K.H.; Muehlen, H.-J., Brennstoff-Waerme-Kraft, 37 (1985) , №1-2, 20-27．
6 Yang Naifu; Yang Yong Yi, Revue de Metallurgie, Nov. 1984, p. 120E, Presentation at annual conference of French Met. Association [ATS], Dec. 1984, Paris.
7 韩其勇,冶金过程动力学,冶金工业出版社,1983,p.157．
8 Smoot, L. D,; Pratt, D.T., Pulverized-Coal Combustion and Gasifiation, Plenum Press, 1979, p. 149-164, 198-200．
9 Smith, I.W., Combustion and Flame, 17 (1971) , 421．
10 Bortz, S.; Fiament, G., Experiment on Pulverized Coal Combustion under Conditions Simulating a Blast Furnace Environment, Preprint at the same Conference as [1] .Z |
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