Search International and National Patent Collections

1. (WO2014203509) METHOD FOR DETECTING ABNORMALITY IN BLAST FURNACE, AND METHOD FOR OPERATING BLAST FURNACE

Pub. No.:    WO/2014/203509    International Application No.:    PCT/JP2014/003170
Publication Date: Thu Dec 25 00:59:59 CET 2014 International Filing Date: Sat Jun 14 01:59:59 CEST 2014
IPC: C21B 7/24
C21B 5/00
F27D 21/00
Applicants: JFE STEEL CORPORATION
JFEスチール株式会社
Inventors: YAMAHIRA, Naoshi
山平 尚史
KODAMA, Toshifumi
児玉 俊文
MORIKAWA, Yasuyuki
森川 泰之
TANAKA, Yusuke
田中 祐輔
Title: METHOD FOR DETECTING ABNORMALITY IN BLAST FURNACE, AND METHOD FOR OPERATING BLAST FURNACE
Abstract:
Provided are: a method for detecting an abnormality in a blast furnace, which can detect, at an earlier stage, such an abnormality that a tuyere gets into a clogged state; and a method for operating a blast furnace, in which the aforementioned method is employed. A camera (11) is placed in the vicinity of a tuyere (2) in a blast furnace (1) to take an image of a raceway through a furnace inside monitoring window (6) arranged at the tuyere (2). When it is determined that the luminance of the image taken by the camera (11) is equal to or lower than a threshold value (S) and the rate of change in the luminance is equal to or lower than a threshold value (R) (i.e., the rate of decrease in luminance is equal to or lower than the threshold value), it is judged that such an abnormality that a tuyere part is in a clogged state occurs.