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.
MATSUZAKI SHINROKU
SHINOTAKE AKIHIKO
SAITO KOUJI
JFE STEEL CORP
KOBE STEEL LTD
NISSHIN STEEL CO LTD
| JPH08188805A | 1996-07-23 | |||
| JP2009221547A | 2009-10-01 | |||
| JP2000199005A | 2000-07-18 | |||
| JPS535243B1 | 1978-02-25 | |||
| JPS4979910A | 1974-08-01 | |||
| JPH08188805A | 1996-07-23 | |||
| JP2009221547A | 2009-10-01 | |||
| JP2000199005A | 2000-07-18 | |||
| JPS535243B1 | 1978-02-25 | |||
| JPS4979910A | 1974-08-01 |