Jfe Steel Corporation

Yasukazu Hayasaka

Satoshi Maruyama

Tetsuya Yamamoto

Natsuo Ishiwata

Naoto Kobayashi

Kazuhira Ichikawa

Yuji Iwami

Masato Kuroiwa

Yohei Kitamura

Tetsuya Jinno

Shunsuke Nonaka

Hiroki Yamaguchi

Kenta Takehara

Katsunori Kikuchi

Kouji Uchimura

Kenji Oya

Naoyuki Takeuchi

Kazuki Oda

A blast furnace operation method comprising a blast furnace to start up smoothly and perform operation after suspending air blowing by removing as much as possible residual coke that remains inside the furnace during suspension of air blowing and becomes an obstacle to discharging solidified matter. In this blast furnace operation method, air blowing is suspended with the height of a surface of a raw material-filled layer immediately above a blast-furnace tuyere reduced below the height of an upper end of a blast-furnace bosh and then air blowing is resumed. After air blowing into the blast furnace is suspended, oxygen or oxygen and a combustible gas are blown in through a burner inserted into a taphole to combust coke remaining inside the furnace and reduce the volume of residues inside the furnace, and after new coke is charged to a region where the volume decreased, air is blown through a tuyere.

Blast furnace operation method

A method of heating up a furnace bottom and a burner lance used in the method are proposed. The method of heating up the furnace bottom includes a step of opening, in the tap hole, a burner lance insertion hole having a diameter larger than a diameter of the burner lance so as to penetrate into the furnace, a step of installing the burner lance in the opened burner lance insertion hole, a step of filling a gap between the installed burner lance and a furnace exterior side of the tap hole with a refractory, and a step of blowing in gas for heating into the furnace from the burner lance to heat up the furnace bottom.

Method of heating up furnace bottom, and burner lance used in the method

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Tokyo, Japan

Yasukazu Hayasaka