Jfe Steel Corporation

Chugai Ro Co., Ltd.

Sumito Ozawa

Koichi Tsutsumi

Ikuhiro Sumi

Yoshihiro Miwa

Takayuki Ito

Kenichi Tomozawa

Koichi Takahashi

Michitaka Sato

Taihei Nouchi

Yuya Morita

Kota Moriya

Yuki Kawashiri

Koki Terui

Provided is a method of operating a blast furnace, including generating a regenerative methane gas using a blast furnace by-product gas, and blowing a blast gas and a reducing agent into the blast furnace from a tuyere, in which the blast gas is oxygen gas, the regenerative methane gas is used as at least part of the reducing agent, and the oxygen gas and/or the regenerative methane gas is preheated before being blown into the blast furnace from the tuyere.

Method of operating blast furnace and blast furnace ancillary facility

Provided is an auxiliary burner for an electric furnace that has high iron scrap heating effect by appropriately and efficiently burning a solid fuel such as coal together with a gas fuel. An auxiliary burner for an electric furnacehas a structure in which a solid fuel injection tube, a gas fuel injection tube, and a combustion-supporting gas injection tubeare coaxially arranged in order from the center. The front end of the solid fuel injection tubeis located inside the gas fuel injection tubeto form, between the front end of the solid fuel injection tubeand the front end of the gas fuel injection tube, a first spacefor solid fuel and gas fuel premixing surrounded by the front end portion of the gas fuel injection tube

Auxiliary burner for electric furnace

An auxiliary burner for an electric furnace capable of increasing and homogenizing the heating effect of iron scrap by suitably and efficiently burning solid fuel along with gas fuel. Auxiliary burnerfor an electric furnace comprises a solid fuel injection tube, a gas fuel injection tube, and a combustion-supporting gas injection tubein the stated order from the center side, all arranged coaxially, and is characterized in that: a combustion-supporting gas flow pathof the 10 combustion-supporting gas injection tubeis provided with a plurality of swirl vanesfor swirling the combustion-supporting gas, and the angle &#x3b8; formed between the swirl vanesand the burner axis is 5&#xb0; or more and 45&#xb0; or less.

Provided is an auxiliary burner for an electric furnace capable of increasing and homogenizing the heating effect of iron scrap by suitably and efficiently burning solid fuel along with gas fuel. This auxiliary burnerfor an electric furnace comprises a solid fuel injection tube, a gas fuel injection tube, and a combustion-supporting gas injection tubein the stated order from the center side, all arranged coaxially, and is characterized in that: a flow pathof the combustion-supporting gas injection tubeis provided with a plurality of swirl vanesfor swirling the combustion-supporting gas, and a flow pathof the gas fuel injection tubeis provided with a plurality of swirl vanesfor swirling the gas fuel; and the angle &#x3b8;of the swirl vanesand the &#x3b8;of the swirl vanessatisfy the relationship &#x3b8;&#x3c;&#x3b8;.

Growing community of inventors

Tokyo, Japan

Sumito Ozawa