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公开(公告)号：US20220154299A1
公开(公告)日：2022-05-19
申请号：US17601481
申请日：2020-04-02
Applicant: JFE STEEL CORPORATION
Inventor： Yumi MURAKAMI , Nobuhiko ODA , Yusuke FUJII , Goro OKUYAMA , Shota AMANO , Shinji KOSEKI , Shingo SATO , Yukio TAKAHASHI , Ryo KAWABATA , Naoki KIKUCHI , Atsuo YUASA
IPC: C21C5/46
Abstract: A top-blowing lance nozzle is configured to freely switch an adequate expansion condition so as to control an oxygen-blowing amount and a jetting velocity independently of each other without requiring a plurality of lance nozzles or a mechanically movable part. A lance nozzle is configured to blow refining oxygen to molten iron charged in a reaction vessel while a gas is blown from a top-blowing lance to the molten iron. One or more blowing holes for blowing a working gas are on an inner wall side surface of the nozzle, at a site where the lance nozzle has a minimum cross-sectional area in a nozzle axis direction or at a neighboring site of the site.
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Patent Agency Ranking
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
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.
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公开(公告)号：US20240093320A1
公开(公告)日：2024-03-21
申请号：US18264249
申请日：2022-01-27
Applicant: JFE STEEL CORPORATION
Inventor： Yoshihiro MIWA , Koichi TSUTSUMI , Goro OKUYAMA
CPC classification number: C21C5/52 , F27B1/28 , F27D17/004
Abstract: To reduce production costs by increasing molten iron heating efficiency, a production method using an electric furnace is provided with a preheating chamber, a melting chamber, a cold iron source supporter operable to partition the preheating chamber into a first and a second preheating chamber, an extruder, and a video device operable to observe the second preheating chamber is used, the method including a melting process, a heating process, a preheating process, and a tapping process are performed. In the heating process, heating of the molten iron is started after the cold iron source supporter is closed, and based on the visual information obtained via the video device of the second preheating chamber.
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公开(公告)号：US20240102737A1
公开(公告)日：2024-03-28
申请号：US18264107
申请日：2022-01-27
Applicant: JFE STEEL CORPORATION
Inventor： Yoshihiro MIWA , Koichi TSUTSUMI , Goro OKUYAMA
CPC classification number: F27D21/02 , F27B3/085 , G02B27/0006 , F27D2021/026
Abstract: To clearly observe the inside of a furnace where an object is heated by a burner. The burner includes: a lens; an imaging device; and a multiple pipe structure including: an inner pipe that surrounds the lens; an outer pipe that surrounds the inner pipe, separated from the inner pipe by a lens coolant passage; a gaseous fuel pipe radially outward of the outer pipe and operable to inject gaseous fuel; a combustion-supporting gas pipe radially outward of the outer pipe and operable to inject combustion-supporting gas; and a cooling pipe outermost in the multiple pipe structure that surrounds the gaseous fuel pipe and the combustion-supporting gas pipe.
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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
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.
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公开(公告)号：US20220323898A1
公开(公告)日：2022-10-13
申请号：US17642548
申请日：2020-08-13
Applicant: JFE STEEL CORPORATION
Inventor： Ryota MURAI , Goro OKUYAMA , Shunsuke OURA , Reo FUJIMURA , Tomomichi NAKAMURA , Shinichi SUEJIMA
Abstract: An exhaust gas treatment method by which mercury contained in exhaust gas can be separated and removed efficiently and inexpensively. The method includes cooling an exhaust gas containing mercury in metal vapor phase by spraying water or other methods to condense mercury in the exhaust gas from metal vapor phase into metal liquid and thus to separate and remove mercury from the exhaust gas. When the exhaust gas is cooled by spraying water, the sprayed water is collected and separated into separated water and a solid containing mercury that has condensed to metal liquid, and mercury is recovered from the solid. The metal mercury particles that have condensed to metal liquid are dispersed in cooling water. The metal mercury particles can thus be easily separated and recovered by using a suitable separation device.
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