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Title:
BLAST FURNACE OPERATING METHOD
Document Type and Number:
Japanese Patent JP2013185181
Kind Code:
A
Abstract:

To provide a blast furnace operating method for making ore reduction and permeability in a furnace diameter direction be proper when blowing a hydrogen-containing reducing gas into a blast furnace shaft part.

In a blast furnace operating method, when blowing a hydrogen-containing reducing gas from a blast furnace shaft part, a blowing amount of a hydrogen gas is 20 Nm3 or more and 150 Nm3 or less per ton of pig iron, and O/C in a radial direction in a blast furnace top part satisfies the following expressions (1) and (2). The expression (1) is (0.003×VH2+1.2)≥a≥(0.003×VH2+0.85) and the expression (2) is a≥1.0, provided that: (a) is (O/C)3/(O/C)2, and it is a ratio of O/C of a furnace peripheral part and a furnace intermediate part when the radial direction of the furnace top part is divided into three and defined as 1, 2 and 3 from a furnace center to a furnace wall; and VH2 is a blowing amount (Nm3/tp) of the hydrogen gas.


Inventors:
HIGUCHI KENICHI
MATSUZAKI SHINROKU
SHINOTAKE AKIHIKO
SAITO KOUJI
Application Number:
JP2012049698A
Publication Date:
September 19, 2013
Filing Date:
March 06, 2012
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORP
JFE STEEL CORP
KOBE STEEL LTD
NISSHIN STEEL CO LTD
International Classes:
C21B5/00
Domestic Patent References:
JPH08188805A1996-07-23
JP2009221547A2009-10-01
JP2000199005A2000-07-18
JPS535243B11978-02-25
JPS4979910A1974-08-01
JPH08188805A1996-07-23
JP2009221547A2009-10-01
JP2000199005A2000-07-18
JPS535243B11978-02-25
JPS4979910A1974-08-01
Attorney, Agent or Firm:
Intellectual Property Office