Kobe Steel, Ltd.

Tadashi Yaso

Takao Harada

Hidetoshi Tanaka

Kiminori Hajika

Toshiyuki Kurakake

Yutaka Miyakawa

Hirofumi Tsutsumi

A rotary hearth furnace includes a unit that supplies an agglomerate onto a hearth of the rotary hearth furnace, a unit that discharges a heated substance which has been heated in the rotary hearth furnace to the outside of the furnace, and a unit that discharges an exhaust gas in the rotary hearth furnace to the outside of the furnace. The rotary hearth furnace has a heating section and a non-heating section. The unit that discharges an exhaust gas to the outside of the furnace is provided in the non-heating section. A unit that takes an outside air into the furnace is provided in the non-heating section and on an upstream side in a flow direction of the exhaust gas from the unit that discharges exhaust gas to the outside of the furnace.

Rotary hearth furnace

A process for producing molten iron with a combination of a moving-hearth reducing furnace and an iron bath-type melting furnace that includes charging a bedding carbonaceous material on a hearth of the moving-hearth reducing furnace and placing carbonaceous material-containing agglomerates containing a powdery iron oxide source and a powdery carbonaceous reductant on the bedding carbonaceous material; thermally reducing the carbonaceous material-containing agglomerates while moving the hearth in the moving-hearth reducing furnace to generate solid reduced iron and simultaneously thermally carbonizing the bedding carbonaceous material to generate char; hot-forming the solid reduced iron and the char into agglomerates without substantial cooling; continuously charging the agglomerates into the iron bath-type melting furnace from thereabove; and blowing oxygen-containing gas into the iron bath-type melting furnace to melt the solid reduced iron and to thereby generate molten iron.

Process for producing molten iron and apparatus for producing molten iron

This invention is intended to lower a temperature of a high-temperature exhaust gas to a desired temperature, while effectively suppressing adhesion of melting components and dusts in the high-temperature exhaust gas onto an inner wall of a cooling tower. For this purpose, a method of the present invention comprises an introduction step of introducing a high-temperature exhaust gas into a cooling tower through a gas duct, and a cooling step of sparging cooling water to the high-temperature exhaust gas in the cooling tower to cool the high-temperature exhaust gas. During the introduction step, the high-temperature exhaust gas is introduced into the cooling tower through the gas duct comprising two gas duct lines, in such a manner that respective portions of the high-temperature exhaust gas from the two gas duct lines become equal to each other in flow velocity and flow volume. Further, respective axes of the two gas duct lines are arranged so as to extend in directions opposed to each other and approximately orthogonal to an axis of the cooling tower, when viewed from a direction along the axis of the cooling tower.

Treatment method for high-temperature exhaust gas

The disclosure relates to improvements of technology for producing metallic iron by thermally reducing an iron source such as iron ore with a carbonaceous reductant such as coke by including efficiently reducing iron oxides into metallic iron at a lower operation temperature while conducting carburization, and efficiently separating the generated metallic iron from slag-forming components such as gangue components contained in raw material ore whereby metallic iron with controlled carbon concentrations can be produced in high yield.

Growing community of inventors

Kobe, Japan

Tadashi Yaso