REFRACTORIES IN HEAT UNITS
THE SERVICE OF DINAS IN AIR-HEATERS WITH A REMOTE
COMBUSTION CHAMBER IN A BLAST FURNACE OF CAPACITY 5000 m
A. P. Gres,
V. V. Makotin,
G. I. Orel,
and V. S. Listopadov
Translated from Novye Ogneupory, No. 6, June, 2004, pp.3–6.
Original article submitted April 8, 2004.
Expertise in the service of a high-burned compacted dinas in the hot zone of an air heater with an external
combustion chamber of a 5000 m
blast furnace has been considered. The repair-to-repair period for the air
heater was 29 years.
The hot-blast temperature and service life of air heaters
are mainly determined by the stove temperature and the
properties of refractories used in the hot zone. In recent
years, most manufacturers have given preference to dinas
At the Magnitogorsk Iron and Steel Works (ISW) and
Petrovskii Metallurgical Works (MW), dinas for the air-
heater stove has been used since 1936.
A the Petrovskii MW, the height of the dinas hot-end
layer was about 2 m. The operating stove temperature was
1150°C, the hot-blast temperature was initially 650 – 750°C,
and then was raised to 820°C. An inspection of the air heat
ers during the overhaul has revealed poor conditions of the
lining. Dinas was affected by cracks, the interface between
chamotte and dinas components looked a continuous sintered
monolith with fused cells. To remedy the situation, the hot
blast temperature was raised to 1000°C, and the dinas lining
height was increased to 8 m. After 8 – 9 years of service, the
lining condition was satisfactory.
In 1966 at the Zaporozhstal MW, in one of the heaters,
a high-burned dense dinas was used to line the stove and
the upper zone of the compustion chamber. The operating
stove temperature initially was 1450°C and then lowered to
1350°C. In the air- heater laid up for repair after 7 years
of service, the dinas lining was found to be in good condition
In succeeding years, the repair of the air-heaters’ refrac-
tory lining was made using dinas, with quite satisfactory re-
METHODOLOGY AND RESULTS
At the Krivoi Rog state-owned integrated mining and
metallurgical works “Krivorozhstal’” (KGGMK), blast fur
nace No. 9 of capacity 5000 m
was installed that was
equipped with four air-heaters each with an external combus
tion chamber of height 53.92 m. Dinas was used to line the
air-heater stove, combustion chamber, radial walls, and the
outer layer of the lining. The air-heater lining was made from
hexagonal blocks with round channels of diameter 41 mm
(item No. 1, State Standard GOST 20901–75), placed in two
layers: one layer (first layer) of height 13.36 m made from
dinas blocks, and the other layer (second layer) of height
28.64 m, made from chamotte blocks (ShV-42-grade).
The heater stove temperature initially was maintained at
1400 – 1300°C, which made it possible to use a hot-blast
temperature of 1270°C. Under these conditions, the tempera
ture at the dinas – ShV-42 interface was 1070 – 1100°C dur
ing the heat-up period, and 950 – 980 during the blast period.
After a lapse of time (two years), the stove temperature and
Refractories and Industrial Ceramics Vol. 45, No. 5, 2004
1083-4877/04/4505-0305 © 2004 Springer Science + Business Media, Inc.
National Metallurgical Academy of Ukraine; Krasnoarmeisk
Dinas Plant Join-Stock Co.; Krivorozhstal’ integrated mining and
metallurgical works (KGGMK), Ukraine.