ISSN 2594-5327
49th Congresso anual — Vol. 49, Num. 1 (1994)
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Abstract
Pulverized coal injection was first practiced in the No.1 BF at Kwangyang Works, POSCO in 1987. Now, it has spread to all the blast furnaces at Kwangyang Works in a state of successful operation. During 7 years of operation, improvements of grinding circuits and injection systems of the coal injection equipment have been made to some extent, and blast furnace operation with higher coal injection rate under higher productivity has been further accelerated during last two years. Meanwhile, to improve furnace gas permeability at high ore-to-coke ratios, precise burdening technologies such as center coke charging and nut coke/ore mixed charging at the furnace periphery have been adopted. Moreover, oxy-coal injection technology aiming to optimize coal combustion efficiency as well as raceway condition has been developed. Furthermore, it was revealed that optimization of burden layer thickness control resulted in not only increased gas permeability but also decreased heat losses through the furnace shell at the lower parts of the furnace. As a result, coal injection rates of Kwangyang No.4 BF are currently being maintained at a level of 140 kg/THM under a productivity of 2.75 T/D.m³(W.V.T). This paper thus briefly describes the experiences and results of the trials obtained so far.
Keywords
coal injection, blast furnace, POSCO, Kwangyang, permeability, oxy-coal, burden control
How to cite
HUR, N. S.; HA, S. K.; CHO, B. R.; KIM, H. D.; KIM, T. S.; HAN, J. W.; CHUNG, J. K..
7 YEARS EXPERIENCES OF COAL INJECTION PRACTICE AT KWANGYANG WORKS,
p. 3223-3236.
In: 49th Congresso anual,
Rio de Janeiro, Brasil,
1994.
ISSN: 2594-5327, DOI 10.5151/2594-5327-49v7-273-286
