ISSN 2594-357X
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Abstract
It is essential for old coke ovens to avoid pushing trouble because this trouble, which has increased gradually with the aging of coke ovens, negatively affects coke stable production and service life of coke ovens. One of effective approaches to improve pushing conditions is to maintain sufficient clearance between coke cake and oven wall. Especially, clearance near coke side has a critical effect on pushing conditions because the oven wall around there has been most damaged in aging coke ovens. Therefore, the way decreasing the bulk density of coal blend in coke ovens locally was investigated in order to improve the clearance near coke side. In particular, coal size segregation in coal bin, which probably controls bulk density distribution in a chamber, was focused on. At the beginning, the effects of charging conditions on coal size segregation and clearance were investigated by laboratory tests. After then, the segregation test that a charging chute was set in coal bin at Kurashiki No.1 coke oven was carried out. Eventually, it was clarified that controlling coal size segregation conditions in coal bin improved the pushing conditions for the chambers whose pushing load was constantly high.
It is essential for old coke ovens to avoid pushing trouble because this trouble, which has increased gradually with the aging of coke ovens, negatively affects coke stable production and service life of coke ovens. One of effective approaches to improve pushing conditions is to maintain sufficient clearance between coke cake and oven wall. Especially, clearance near coke side has a critical effect on pushing conditions because the oven wall around there has been most damaged in aging coke ovens. Therefore, the way decreasing the bulk density of coal blend in coke ovens locally was investigated in order to improve the clearance near coke side. In particular, coal size segregation in coal bin, which probably controls bulk density distribution in a chamber, was focused on. At the beginning, the effects of charging conditions on coal size segregation and clearance were investigated by laboratory tests. After then, the segregation test that a charging chute was set in coal bin at Kurashiki No.1 coke oven was carried out. Eventually, it was clarified that controlling coal size segregation conditions in coal bin improved the pushing conditions for the chambers whose pushing load was constantly high.
Keywords
Pushing trouble; Coke cake; Clearance; Size segregation.
Pushing trouble; Coke cake; Clearance; Size segregation.
How to refer
Dohi, Yusuke;
Hanaoka, Koji;
Yamamoto, Tetsuya;
Takigawa, Manabu;
Fukada., Kiyoshi.
EFFECT OF COAL SIZE SEGREGATION IN COAL BIN
ON PUSHING CONDITIONS OF COKE CAKE
,
p. 658-664.
In: 42º Seminário de Redução de Minério de Ferro e Matérias-primas / 13º Seminário Brasileiro de Minério de Ferro / 6th International Congress on the Science and Technology of Ironmaking,
Rio de Jabeiro,
2012.
ISSN: 2594-357X
, DOI 10.5151/2594-357X-22141
