DEVELOPMENT OF A HEAT INSULATED ROOF
OF A HIGH-CAPACITY GLASSMAKING FURNACE
V. Ya. Dzyuzer
Translated from Novye Ogneupory, No. 7, pp. 27 – 31, July, 2014.
Original article submitted May 22, 2014.
Requirements imposed on the quality of Dinas refractory (silica refractory) and mortar intended for the ma
sonry of the roof of a high-capacity glassmaking furnace are formulated. A calculation of the parameters of a
curved roof with width of the span 9 m using only wedge-shaped articles is presented. The efficiency require
ments of the thermal insulation of the roof are determined. A novel structure of thermal insulation based on the
use of molded and unmolded articles is developed. With an average reheat temperature of the roof of 1486°C,
the specific heat flow into the environment is 544 W/m
, which is 33.4 – 57.6% below the indicators of
well-known designs for the thermal insulation of the roof of a glassmaking furnace.
Keywords: glassmaking furnace, arch of roof, refractory, thermal insulation, heat resistance, heat flow
The roof of the work space is one of the basic structural
elements of a glassmaking furnace. In high-capacity con-
tainer glass making furnaces (300 – 450 t/day), the working
temperature of the roof reaches 1580 – 1600°C with width of
the span 9 – 11 m. A curved roof is created with central angle
60°. Depending on its length, the work space is divided into
sections of length 4–6mseparated by expansion joints. The
masonry of the sections is bonded with the use of straight
and arch bricks. Tripartite articles are used to bond the joints.
The construction of the roof of a glassmaking furnace
possesses a number of distinctive features that are not char
acteristic of furnaces used for other production purposes .
First, the arc of the roof has a single interlocking series situ
ated along the longitudinal axis of the furnace. Second, in
modern glassmaking furnaces the metallic framework of the
furnace maintains the stiffness of the construction of the sec
tions of the roof without the support of abutment bricks on
the longitudinal walls of the work space. Third, the roof of a
glassmaking furnace is subject to mandatory thermal insula
tion the efficiency of which is characterized by the relatively
high thermal resistance of the masonry, with R in the range
1.07 – 1.70 (m
·K)/W, and low losses of heat into the envi
ronment, q = 816.8 – 1282.1 W/m
. It is clear that a
lesser value of q corresponds to a higher value of R.
At the same time, the wish to increase the energy effi-
ciency of furnaces and increase their service life to 9–10
years presupposes a further improvement in the structure of
the roof. The problem is to increase the operating reliability
of the roof as well as the energy efficiency of the cold lining.
The complex nature of the task entails a comprehensive ap-
proach to its implementation. Let us discuss three aspects of
the problem: the quality of the refractory articles and the
mortar and the need to improve the construction of the roof
and develop an energy-efficient structure of its thermal insu
Despite the presence of vapors of the sulfates of alkaline
metals in the gas medium of the work space, vitreous Dinas
(silica refractory) is used for the masonry of the roof of a
glassmaking furnace. Its superiority over alternative elec
tro-fused baddeleyite corundum refractory is due to its high
resistance to creep flow (plastic deformation), the relatively
low thermal conductivity of Dinas, as well as the total solu
bility of the products of the decomposition of the refractory
in a glass melt. High-quality vitreous Dinas is characterized
by a balanced chemical composition in which the mass frac
tion of SiO
is at least 96% while the content of Fe
not exceed 0.5%. The products of the Krasnoarmey Dinas
factory (Brand DSK), of the Czech firm of MSLZ a.s.
(Disil-DSS and Disil-DSA), and of the German firm RHI
Glas GmbH (Stella GGS) may serve as examples. The data
of Table 1 indicates that these brands of the refractory are
close in terms of chemical composition and other properties.
Refractories and Industrial Ceramics Vol. 55, No. 4, November, 2014
1083-4877/14/05504-0306 © 2014 Springer Science+Business Media New York
FGAOU VPO Ural Federal University, Yekaterinburg, Russia.