Jfe Steel Corporation

Chugai Ro Co., Ltd.

Yoshihiro Miwa

Koichi Tsutsumi

Ikuhiro Sumi

Sumito Ozawa

Takayuki Ito

Kenichi Tomozawa

A method for manufacturing molten iron by melting a cold iron source in an electric arc furnace having a carbonaceous material-injecting device. The method includes, in the carbonaceous material-injecting device, while a carbonaceous material is injected with a carrier gas through a central portion of the carbonaceous material-injecting device, injecting a fuel and a combustion-supporting gas through respective outer peripheral portions of the carbonaceous material-injecting device. The carbonaceous material injected through the central portion passes through a cylindrical combustion flame generated by a combustion reaction between the fuel and the combustion-supporting gas and is injected into molten slag and molten iron.

Method for manufacturing molten iron with electric arc furnace

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

Yoshihiro Miwa