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公开(公告)号：US20220403478A1
公开(公告)日：2022-12-22
申请号：US17772675
申请日：2020-10-14
Applicant: JFE STEEL CORPORATION
Inventor： Yoshihiro MIWA , Koichi TSUTSUMI , Ikuhiro SUMI
Abstract: 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.
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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：US20190264914A1
公开(公告)日：2019-08-29
申请号：US16320217
申请日：2017-07-24
Applicant: JFE STEEL CORPORATION , CHUGAI RO CO., LTD.
Inventor： Koichi TSUTSUMI , Yoshihiro MIWA , Sumito OZAWA , Ikuhiro SUMI , Kenichi TOMOZAWA , Takayuki ITO
Abstract: 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 burner 100 for an electric furnace comprises a solid fuel injection tube 1, a gas fuel injection tube 2, and a combustion-supporting gas injection tube 3 in the stated order from the center side, all arranged coaxially, and is characterized in that: a flow path 30 of the combustion-supporting gas injection tube 3 is provided with a plurality of swirl vanes 4 for swirling the combustion-supporting gas, and a flow path 20 of the gas fuel injection tube 2 is provided with a plurality of swirl vanes 5 for swirling the gas fuel; and the angle θ1 of the swirl vanes 4 and the θ2 of the swirl vanes 5 satisfy the relationship θ1
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公开(公告)号：US20250003684A1
公开(公告)日：2025-01-02
申请号：US18709516
申请日：2022-10-26
Applicant: JFE STEEL CORPORATION
Inventor： Koichi TSUTSUMI , Yoshihiro MIWA , Yosuke TAKADA , Wataru TODO , Sumito OZAWA , Hideo KIJIMA
Abstract: Molten iron is obtained with a low electric power consumption rate by efficiently and reliably preheating a cold iron source by ascertaining the preheating state of the cold iron source. A method of producing molten iron in an electric furnace having a preheating chamber and a melting chamber includes: a cold iron source feeding step; a cold iron source preheating step having a preheating confirmation step; a supply step; and a melting step.
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Patent Agency Ranking
公开(公告)号：US20240417818A1
公开(公告)日：2024-12-19
申请号：US18698688
申请日：2022-07-21
Applicant: JFE STEEL CORPORATION
Inventor： Yoshihiro MIWA , Wataru TODO , Nobuhiko ODA
IPC: C21B11/10
Abstract: A method for predicting an impurity concentration of molten iron after refining of molten iron to be refined in an electric arc furnace facility includes inputting, into an impurity concentration prediction model, an amount of individual ferrous scrap material charged, the ferrous scrap material being classified by type, and at least one of the impurity concentration of molten iron in a preceding charge, an amount of residual molten iron in the preceding charge, and market transaction price information of an impurity; and outputting the impurity concentration of the molten iron in a subsequent charge.
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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：US20240035102A1
公开(公告)日：2024-02-01
申请号：US17630025
申请日：2020-06-22
Applicant: JFE STEEL CORPORATION
Inventor： Yoshihiro MIWA , Koichi TSUTSUMI , Ikuhiro SUMI
CPC classification number: C21B11/10 , C21C5/5294 , C21C5/5205 , C21C5/565 , C21C5/5217
Abstract: An electric furnace with energy utilization efficiency at a low cost. In an electric furnace, a preheating chamber 2 with a melting chamber 1 is used to preheat iron scrap x, an exhaust gas generated in melting chamber 1 is passed through preheating chamber 2 filled with the iron scrap x to preheat the iron scrap x, the iron scrap x descends in the preheating chamber 2 to be supplied into melting chamber 1, and the iron scrap x is melted to obtain molten iron m. The iron scrap x is charged into preheating chamber 2 so that bulk density is not less than 0.50 t/m3 and less than 1.00 t/m3 and an iron scrap filling ratio HSC/HSF in the preheating chamber 2 is 0.5 to 0.8. A carbonaceous material is used for melting the iron scrap x, and oxygen and the carbonaceous material are blown into the melting chamber.
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公开(公告)号：US20190271465A1
公开(公告)日：2019-09-05
申请号：US16320206
申请日：2017-07-24
Applicant: JFE STEEL CORPORATION , CHUGAI RO CO., LTD.
Inventor： Sumito OZAWA , Koichi TSUTSUMI , Yoshihiro MIWA , Ikuhiro SUMI , Kenichi TOMOZAWA , Takayuki ITO
Abstract: 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 presently disclosed auxiliary burner 100 for an electric furnace comprises a solid fuel injection tube 1, a gas fuel injection tube 2, and a combustion-supporting gas injection tube 3 in the stated order from the center side, all arranged coaxially, and is characterized in that: a combustion-supporting gas flow path 30 of the combustion-supporting gas injection tube 3 is provided with a plurality of swirl vanes 4 for swirling the combustion-supporting gas, and the angle θ formed between the swirl vanes 4 and the burner axis is 5° or more and 45° or less.
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