NEW METHODS FOR MONITORING THE TECHNICAL STATE
OF BLAST FURNACE ENCLOSURE WITHOUT STOPPING
THE TECHNOLOGICAL PROCESS
V. I. Bol’shakov,
A. L. Chaika,
S. P. Sushchev,
A. A. Suslonov,
A. B. Yur’yev,
S. F. Bugaev,
G. V. Panchokha,
and A. V. Borodulin
Translated from Novye Ogneupory, No. 7, pp. 34 – 38, July, 2007.
Original article submitted September 15, 2006.
The problem of technical monitoring of the state of blast furnaces are considered in the context of extending
the service life of furnaces, and estimating the reliability of their structural elements. The method of
videomonitoring of the technical state of the blast furnace enclosure without stopping the process is described
for the first time.
According to the data in , among the instruments for
monitoring the blast furnace processes, the third in signifi-
cance is monitoring of heat losses from the working space of
the furnace (next after monitoring the consumption of iron
ore and coke and technology of working out the melting
products). At present, the issues of monitoring the technical
state of the furnace, extending its service life, and estimating
the reliability of its structural elements based on experimen
tal data become especially topical.
The external heat loss from the blast furnace working
space in the domestic practice is not automatically measured
due to the absence of clear physical notions of the relation
between this most significant parameter of a blast heat, the
degree of wear of the furnace structural elements, and its
operation schedule. The external heat losses are still ac
counted based on a disbalance in the input and output items
of the thermal balance of a blast heat, which is an obvious
anachronism and does not contribute to upgrading the theory
and practice of metallurgy of cast iron. The first experimen
tal studies of the furnace erosion profile and measurements
of the jacket temperature variations were carried out by
I. L. Bell and S. B. Simens at the Clarence Iron Works as
early as the 19th century . The results of those studies are
shown in Fig. 1.
The temperature field of a contemporary blast furnace
jacket have been obtained for furnace No. 5 of effective
volume 1719 m
at the Novokuznetsk Metallurgical Works
based on the readings of a portable radiation pyrometer in
2003 – 2005 (Fig. 2).
The horizontal line in Fig. 2 divides the stack into the
cooled (lower) zone and the uncooled (upper) zone and the
vertical lines are located between hot-metal tapholes (HT).
The thermogram exhibits dark spots indicating zones with a
decreased temperature where later skull was observed in a
capital repair and had to be removed by explosion (furnace
No. 5 at the Novokuznestkii Metallurgical Works).
The thermographic approach is widely used in engineer
ing and medicine and is believed promising as well for
studying temperature fields and stresses in the furnace jacket,
controlled the cooling system in blast furnaces, and planning
prophylactic repairs. The temperature fields of the stack
jacket were constructed for furnace No 9 of useful volume
at the Krivorozhstal’ Works in 2005 based on data
obtained from thermocouples installed in the jacket and
brickwork. Analysis of these thermograms showed that the
temperature state of the enclosure responds to variations in
the furnace working regime (Fig. 3). The erosion of the blast
furnace hearth to a large extent determines its safe perfor
mance and duration of the time between overhauls. The sys
Refractories and Industrial Ceramics Vol. 48, No. 3, 2007
1083-4877/07/4803-0178 © 2007 Springer Science+Business Media, Inc.
Institute of Ferrous Metallurgy, National Academy of Sciences of
Ukraine; TsIEKS Institute; West-Siberian Metallurgical Works,
S. P. Milizhenko, A. I. Pershikov, V. N. Polyakov, A. A. Sokhats
kii, P. V. Sushchv, D. N. Markin, and O. A. Bykov participated in