Method for operating blast furnace

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United States of America Patent

PATENT NO 10400292
APP PUB NO 20180023152A1
SERIAL NO

15547891

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Importance

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Abstract

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A method for operating a blast furnace includes blowing pulverized coal and oxygen from an upstream lance configured by a double tube. LNG is blown from a downstream lance on the downstream side in a hot air blast direction, oxygen is supplied from the upstream lance, and the pulverized coal whose temperature has been increased by the combustion of the LNG is combusted along with the supplied oxygen or oxygen in an air blast. With respect to a direction perpendicular to the hot air blast and a downstream direction of the hot air blast, a blowing direction of the LNG from the downstream lance with respect to the blast direction ranges from −30° to +45°. A blast pipe circumferential direction angle at a blowing position of the LNG from the downstream lance with respect to where the upstream lance is inserted into a blast pipe ranges from 160° to 200°.

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Patent Owner(s)

Patent OwnerAddress
JFE STEEL CORPORATIONTOKYO 100-0011

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kawashima, Tomoyuki Tokyo, JP 14 48
Murao, Akinori Tokyo, JP 10 23
Ooyama, Nobuyuki Tokyo, JP 2 2
Yamamoto, Naoki Tokyo, JP 377 4138

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