The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 22, 2025
Filed:
Dec. 14, 2020
Applicant:
Jfe Steel Corporation, Tokyo, JP;
Inventors:
Yuki Kawashiri, Tokyo, JP;
Sumito Ozawa, Tokyo, JP;
Koichi Takahashi, Tokyo, JP;
Taihei Nouchi, Tokyo, JP;
Yuya Morita, Tokyo, JP;
Assignee:
JFE STEEL CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C21B 5/00 (2006.01); F27D 17/00 (2025.01); F27D 17/10 (2025.01);
U.S. Cl.
CPC ...
C21B 5/001 (2013.01); F27D 17/10 (2025.01); C21B 2005/005 (2013.01); C21B 2100/62 (2017.05); C21B 2100/64 (2017.05);
Abstract
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.