公开(公告)号：US20230175084A1

公开(公告)日：2023-06-08

申请号：US17995310

申请日：2021-01-06

申请人： JFE STEEL CORPORATION

发明人： Koichi TAKAHASHI ,  Sumito OZAWA ,  Yuki KAWASHIRI ,  Yuya MORITA ,  Taihei NOUCHI ,  Michitaka SATO

IPC分类号： C21B5/06 ,  C21B13/00 ,  C21B7/00 ,  F27D17/00

CPC分类号： C21B5/06 ,  C21B13/0073 ,  C21B7/002 ,  F27D17/00 ,  C21B2005/005

摘要： Provided is a steelmaking line contributing to the realization of a method that achieves energy saving and CO2 emission reduction when producing reduced iron from iron oxide. The steelmaking line comprises: a blast furnace configured to reduce iron oxide; a reducing furnace configured to reduce iron oxide; a methane synthesizer configured to synthesize methane from blast furnace gas and/or furnace top gas, and hydrogen gas; a blower configured to blow the methane gas synthesized by the methane synthesizer into the blast furnace; a heat-reformer configured to heat or heat-reform the blast furnace gas and/or the furnace top gas, and the methane gas synthesized by the methane synthesizer, to generate reducing gas; a reducing gas blower configured to blow the reducing gas into the reducing furnace; and a supply path configured to supply the furnace top gas to the methane synthesizer and/or the heat-reformer.

公开(公告)号：US20220380860A1

公开(公告)日：2022-12-01

申请号：US17755791

申请日：2020-11-11

申请人： JFE STEEL CORPORATION

发明人： Koichi TAKAHASHI ,  Taihei NOUCHI ,  Sumito OZAWA ,  Yuki KAWASHIRI ,  Yuya MORITA

IPC分类号： C21B7/16 ,  C21B5/00

摘要： Provided is a method of operating a blast furnace, having generating a regenerative methane gas from a by-product gas discharged from the blast furnace, and blowing a blast gas and a reducing agent into the blast furnace from a tuyere of the blast furnace in which the blast gas is oxygen gas and the regenerative methane gas is used as at least part of the reducing agent.

公开(公告)号：US20240132982A1

公开(公告)日：2024-04-25

申请号：US18274853

申请日：2022-01-13

申请人： JFE STEEL CORPORATION

发明人： Yuki KAWASHIRI ,  Tetsuya YAMAMOTO ,  Taihei NOUCHI ,  Kazuhira ICHIKAWA

IPC分类号： C21B7/24

CPC分类号： C21B7/24

摘要： A residual molten material amount detection method and detection apparatus that can detect a residual amount of molten material in a vertical furnace and a method for operating a vertical furnace by using the detection method. The residual molten material amount detection method detects a residual amount of molten material remaining in a bottom portion of a vertical furnace after end of discharge of the molten material. The method includes detecting the residual amount of the molten material by using a difference between a production speed of the molten material and a discharge speed of the molten material that is calculated by using a discharge acceleration, a discharge period, and an initial discharge speed of the discharge of the molten material through a taphole.

公开(公告)号：US20240118029A1

公开(公告)日：2024-04-11

申请号：US18274814

申请日：2022-01-13

申请人： JFE STEEL CORPORATION

发明人： Yuki KAWASHIRI ,  Tetsuya YAMAMOTO ,  Kazuhira ICHIKAWA ,  Taihei NOUCHI

IPC分类号： F27B1/28 ,  F27D21/00 ,  G01F23/22

CPC分类号： F27B1/28 ,  F27D21/0028 ,  G01F23/22

摘要： A molten material liquid level detection method that can detect a liquid level of molten material from a residual amount of the molten material with high accuracy and a method for operating a vertical furnace by using the detection method. The molten material liquid level detection method detects a liquid level of molten material remaining in a bottom portion of a vertical furnace after end of discharge of a molten material. The molten material liquid level detection method includes calculating a void fraction of the solid-filled structure, and detecting a liquid level of the molten material after the end of the discharge by using the calculated void fraction and a residual amount of the molten material after the end of the discharge.

公开(公告)号：US20230034442A1

公开(公告)日：2023-02-02

申请号：US17757828

申请日：2020-12-14

申请人： JFE STEEL CORPORATION

发明人： Yuki KAWASHIRI ,  Sumito OZAWA ,  Koichi TAKAHASHI ,  Taihei NOUCHI ,  Yuya MORITA

IPC分类号： C21B5/00 ,  F27D17/00

摘要： Provided is a method of operating a blast furnace, including generating a regenerative methane gas using a blast furnace by-product gas, and blowing a blast gas and a reducing agent into the blast furnace from a tuyere, in which the blast gas is oxygen gas, the regenerative methane gas is used as at least part of the reducing agent, and the oxygen gas and/or the regenerative methane gas is preheated before being blown into the blast furnace from the tuyere.