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:
Mar. 30, 2021
Filed:
Feb. 05, 2016
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Jfe Steel Corporation, Tokyo, JP;
Kobe Steel, Ltd., Kobe, JP;
Nisshin Steel Co., Ltd., Tokyo, JP;
Nippon Steel & Sumikin Engineering Co., Ltd., Tokyo, JP;
Nobuaki Ito, Tokyo, JP;
Hitoshi Donomae, Tokyo, JP;
Kimihito Suzuki, Tokyo, JP;
Kenji Nakao, Tokyo, JP;
Toshio Isohara, Tokyo, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
JFE STEEL CORPORATION, Tokyo, JP;
KOBE STEEL, LTD., Kobe, JP;
NISSHIN STEEL CO., LTD., Tokyo, JP;
NIPPON STEEL ENGINEERING CO., LTD., Tokyo, JP;
Abstract
The present invention provides a novel method for supplying a reducing gas to the shaft part of a blast furnace with which a large amount of reducing gas containing hydrogen at a high concentration can be supplied to a deeper position in the blast furnace (location of the blast furnace closer to the center axis in the radial direction) and with which it is possible to reduce the total generated amount of COof the COamount that is reduced by conducting hydrogen smelting in the blast furnace and the COamount that is generated during production of the reducing gas supplied to the blast furnace. The method for supplying a reducing gas to the shaft part of a blast furnace according to the present invention is characterized by reforming coke oven gas by increasing the temperature thereof to 1200 to 1800° C. in a reactor in which an oxygen-containing gas is supplied to preheated coke oven gas to generate reformed gas in which hydrogen gas is enriched; mixing the reformed gas with CO-containing gas in the reactor so that the hydrogen concentration of the reducing gas is adjusted to 15-35 vol % (wet); and supplying the resultant reducing gas to the shaft part of the blast furnace under a condition of a ratio of a flow rate of reducing gas blown into shaft part/flow rate of reducing gas blown into tuyere >0.42.