Jfe Steel Corporation

Nkk Corporation

Chugai Ro Co., Ltd.

National Institute of Advanced Industrial Science and Technology

J. A. Woolam Japan Corporation

Koichi Tsutsumi

Ikuhiro Sumi

Yukinori Iizuka

Yoshihiro Miwa

Sumito Ozawa

Makoto Suzuki

Takayuki Ito

Jun Kubota

Masayuki Nakada

Kenichi Tomozawa

Yutaka Awajiya

Junji Tominaga

Takashi Kuroki

Michio Suzuki

Takayuki Shima

Masashi Kuwahara

Yoshiki Fujii

Toshio Fukaya

Masayuki Fukami

Rie Endo

Masahiro Susa

Yoshinobu Kuga

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 a cutting machine that cuts a high-temperature moving object to be cut while moving in synchronization with the movement of the object to be cut, and that is capable of effectively protecting itself from the heat of the object to be cut and effectively utilizing the heat. A cutting machine for cutting a high-temperature moving object to be cut while moving in synchronization with the movement of the object to be cut, comprising: a cutter configured to cut the object to be cut; a movement device configured to move the cutting machine in synchronization with the object to be cut; a water-cooling plate configured to cool the cutting machine; and a thermoelectric power generation device including a thermoelectric element for converting the heat of the object to be cut into electric energy, wherein the water-cooling plate also serves to cool a low-temperature side of the thermoelectric element.

Cutting machine and thermoelectric power generation method

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;.

An apparatus for optical measurement of a liquid or molten material, which has: a transparent container which has a bottom face and is capable of containing a to-be-measured material therein, with the bottom face at least having a flat face and being transparent; and an optical device that irradiates a light to the bottom face of the container and that detects and measures a reflected light from the bottom face; and a method for optically measuring a liquid or molten material using the apparatus.

Optical measurement apparatus and optical measurement method for a liquid or molten material

A method for detecting a crater end of a continuously cast product, including installing an ultrasonic shear wave sensor for transmitting an ultrasonic shear wave to the continuously cast product and receiving the transmitted ultrasonic shear wave in a continuous casting machine, detecting based on variations of an ultrasonic signal received by the ultrasonic shear wave sensor that the crater end of the cast product is matched with the installed position of the ultrasonic shear wave sensor, calibrating a physical property value used in a calculation based on a heat condition equation such that the crater end computed based on the heat condition equation using casting conditions at that time is matched with the installed position of the ultrasonic shear wave sensor, and after the calibration, determining the crater end by the calculation based on the heat condition equation under respective casting conditions by using the calibrated physical property value.

Method and apparatus for detecting a crater end of a continuously cast product

A method for detecting a crater end of a continuously cast product including installing an ultrasonic shear wave sensor for transmitting an ultrasonic shear wave to a cast product and receiving the transmitted ultrasonic longitudinal wave and an ultrasonic longitudinal wave sensor for transmitting an ultrasonic longitudinal wave to the cast product and receiving the transmitted ultrasonic longitudinal wave at the same position in a continuous casting machine or at positions apart from each other in a casting direction, but at the same position in a transverse direction of the cast product, detecting based on variations of an ultrasonic signal received by the ultrasonic shear wave sensor that the crater end of the cast product is matched with the installed position of the ultrasonic shear wave sensor, calibrating a calculation formula for determining the crater end and determining the crater end.

Method and apparatus for detecting crater end of continuously cast product, and method for producing continuously cast product

A manufacturing method for a continuously cast product of steel includes the steps of detecting a position of a crater end of the product by a method for measuring a solidification state of the continuously cast product using a sensor arranged so as to be in non-contact with the product, and controlling at least one condition selected from the conditions of the casting speed and the quantity of secondary cooling water based on the detected position of crater end. The method for measuring a solidification state of continuously cast product includes the steps of transmitting transverse waves of burst-like electromagnetic ultrasonic waves, in which at least one selected from frequency, amplitude, and phase is modulated within a pulse width that has a magnitude of 50 to 150% of the maximum time width not exceeding a time of flight for propagating in said product, to said product as a transmitting signal, receiving a signal after said transmitting signal propagates in said product as a receiving signal, and judging the solidification state of said product by performing a correlation operation of said receiving signal by using a reference signal of a waveform that is the same as or similar to said transmitting signal.

Manufacturing method for continuously cast product of steel

A manufacturing method for a continuously cast product of steel includes the steps of detecting a position of crater end of product by a method for measuring a solidification state of continuously cast product using a sensor arranged so as to be in non-contact with the product, and controlling at least one condition selected from the conditions of the casting speed and the quantity of secondary cooling water based on the detected position of crater end. The method for measuring a solidification state of continuously cast product includes the steps of cooling the product until a surface layer portion thereof is &#x3b1; transformed, transmitting transverse waves of electromagnetic ultrasonic waves to the cooled product, receiving the signal after the transmitting signal propagates in the product, and judging the solidification state of the product based on the received signal.

Growing community of inventors

Tokyo, Japan

Koichi Tsutsumi