REFRACTORIES IN HEAT UNITS
THEORY AND PRACTICE OF FLAME TORCRETING A 160-TON OXYGEN
P. S. Kharlashin,
A. A. Larionov,
A. K. Kharin,
and N. O. Chemeris
Translated from Novye Ogneupory,No.7,pp.5–9,July 2010.
Original article submitted April 23, 2010.
A new concept is presented for the design of the dust duct and lance, based on a two-speed approach. Results
are provided for studying the effect of powder concentration on the distribution of some parameters through
out the whole line, i.e. from the powder feeder to the lance nozzle. Results are obtained with use of a model of
a two-speed gas mixture stream.
Keywords: flame torcreting, lining, oxygen converter, mathematical model of a two-speed gas mixture
An area for improving the productivity of the oxygen
converter process is an increase in heating unit lining life.
Currently the main factors that provide an increase the life of
periclase carbon lining of converters, are use of special mag-
nesia fluxes for forming the final slag with improved skull
properties, and also repair of the lining by flame torcreting.
In the 1970s the Il’ich Mariupol’ Metallurgical Combine,
the All-Union Institute of Refractories and Don NIIchermet
developed and introduced a fundamentally new process for
torcreting, i.e. flame torcreting. In the oxygen converter
workshop test equipment was designed and constructed and
tests were carried out successfully for torcreting vertical con
verters with a torcrete mix based on lime. However, for a
number of reasons the process was not introduced widely. In
the 1980s this process was expanded to all converters of the
previous USSR, and later in Germany, Japan, and China.
Methods and devices for flame torcreting of metallurgical
units and torcrete mixes were patented in the USA, Great
Britain, France and other countries (18 patents in all). The
technology of vertical flame torcreting was only introduced
into OAO MM Kim. Il’ich in 1996 – 2002.
The arrangement of the main equipment is shown in
Fig. 1 for repairing converters by flame torcreting. A torcrete
mix is supplied to the workshop in cement trucks, from
which the powder is pumped to two reception chamber feed-
ers 1 and 2. The weight of powder in one feeder vessel is
15 tons. Transfer of the powder from the reception to the
Refractories and Industrial Ceramics Vol. 51, No. 4, 2010
1083-4877/10/5104-0223 © 2010 Springer Science+Business Media, Inc.
From the proceedings of the International Conference of Metal
lurgists and Refractory Workers (April 22 – 23, 2010, Moscow).
OAO Mariupol’ Il’ich Metallurgical Combine, Mariupol’, Ukraine.
Priazov State Technical University, Mariupol’, Ukraine.
Fig. 1. Diagram of a vertical torcreting unit for AOA MM Kim.
Il’icha converters: 1, 2 ) chamber intermediate feeders; 3, 4 ) cham
ber working feeders; 5, 6, 7 ) oxygen and water supply and water
outlet; 8 ) torcrete lance; 9 ) converter hood; 10 ) waste gases; 11 )
converter; 12 ) cement truck; –®) torcrete mix material supply;
––®) dusty air outlet.