EFFECTIVENESS OF DIFFERENT DESIGNS OF REFRACTORY LININGS
FOR ROTARY KILNS IN RELATION TO THEIR THERMOPHYSICAL
O. V. Titov
and I. I. Beloglazov
Translated from Novye Ogneupory, No. 6, pp. 27 – 28, June, 2015.
Original article submitted March 11, 2015.
A new design is presented for a refractory lining to be used in rotary furnaces. The temperature fields for the
new design and the existing design are calculated with the use of the software packages Ansys Fluent and
Ansys ICEM. The thermophysical characteristics of both designs are compared and recommendations are
given on the new lining’s areas of application.
Keywords: refractory lining, tubular rotary furnace, computer modeling.
One of the main factors that determines the thermal effi-
ciency of a rotary kiln is the thermal resistance of the lining,
since the amount of heat lost to the environment through the
furnace’s shell can be equal to 10 – 15% of the total heat of
The lack of strong heat-resistant materials with good
heat-insulating properties has been the main impetus for the
research being done to develop high-thermal-resistance lin
ings by the introduction of a fibrous heat-insulating material.
Such a material is introduced into the lining by altering the
shape of the refractory that is used. The thermal insulation
can be in the form of fibrous structures such as mullite-silica
wool with inorganic additives, basalt fibers, or similar struc
tures that can function at temperatures up to 1600°C. In the
case being discussed, a compartment which is filled with the
heat-insulating material is created between the shell and the
lining of the furnace [1, 2].
The largest reductions in the amount of heat lost to the
environment and the weight of the refractory can be achieved
by installing shaped refractories in the high-temperature
zone of the furnace. Such a measure also ensures a high rate
of heat transfer to the material being processed and a de
crease in the overall weight of the furnace . Figure 1
shows a design of a lining in which the shell supports the re
fractory product with the aid of bridges formed by the
above-mentioned compartments. Given the mechanical and
thermal loads that develop during the operation of the kiln,
its modified configuration better preserves the mechanical
strength of the refractory product and ensures that a high de-
gree of thermal efficiency is attained.
To determine the feasibility of installing a lining com-
posed of variously configured shaped refractories while also
Refractories and Industrial Ceramics Vol. 56, No. 3, September, 2015
1083-4877/15/05603-0260 © 2015 Springer Science+Business Media New York
NMSU “Gornyi,” St. Petersburg, Russia.
Fig. 1. Design of the lining of the rotary furnace: a) existing design;
b ) design under consideration; 1 ) fibrous material; 2 ) fireclay lin