公开(公告)号：US20240085110A1

公开(公告)日：2024-03-14

申请号：US18263538

申请日：2022-01-27

Applicant: JFE STEEL CORPORATION

Inventor： Koichi TSUTSUMI ,  Yoshihiro MIWA ,  Shohei NAGASHIMA ,  Goro OKUYAMA ,  Katsutoshi ENDO ,  Shunichi KAWANAMI

IPC: F27B3/28 ,  C21B11/10 ,  F27B3/18 ,  F27D21/02

CPC classification number: F27B3/28 ,  C21B11/10 ,  F27B3/18 ,  F27D21/02 ,  F27D2021/026

Abstract: To ensure stable supply of a cold iron source to a melting chamber, a method of producing molten iron uses an electric furnace that includes: a preheating chamber; a melting chamber; an extruder located in the preheating chamber; and a video device configured to observe an inside of the melting chamber, and comprises: an extrusion process of supplying a cold iron source preheated in the preheating chamber to the melting chamber by the extruder; and a melting process of melting the cold iron source supplied to the melting chamber by arc heat to obtain molten iron, wherein in the extrusion process, a moving amount of the extruder and/or a time interval for moving the extruder is controlled based on visual information obtained from the video device.

公开(公告)号：US20240118032A1

公开(公告)日：2024-04-11

申请号：US18263933

申请日：2022-01-27

Applicant: JFE STEEL CORPORATION

Inventor： Koichi TSUTSUMI ,  Yoshihiro MIWA ,  Goro OKUYAMA ,  Katsutoshi ENDO ,  Shunichi KAWANAMI

IPC: F27D21/02 ,  F27B3/08

CPC classification number: F27D21/02 ,  F27B3/085 ,  F27D2021/026

Abstract: To directly and clearly observe the state inside a melting chamber in an electric furnace, a video-device-equipped electric furnace comprises: a melting chamber; a preheating chamber; and a video device to observe an inside of the melting chamber. The video device includes: a relay lens; an inner tube containing the relay lens and having an outer diameter of 100 mm or less; an outer tube containing the inner tube; and an imaging device located at an axial end of the relay lens on a furnace outside. The video device is provided through a hole in a furnace wall or lid so that the relay lens is located 300 mm to 3500 mm away from a highest molten iron interface in a vertically upward direction and the imaging device is located 300 mm or more away from an inner wall of the furnace wall or lid in a furnace outward direction.