OPTIMIZING THE MULTILAYER HEAT-INSULATING LIGHTWEIGHT
REFRACTORY LININGS OF INDUSTRIAL FURNACES
AND HEAT-POWERED UNITS
V. M. Zubashchenko
and I. N. Kuzin
Translated from Novye Ogneupory, No. 5, pp. 58 – 60, May, 2005.
Original article submitted March 24, 2005.
A universal criterion for estimating the service life of the refractory lining in heat-powered units is proposed.
An algorithm for optimum choice of the design and thermal engineering properties of multilayer heat-insulat
ing linings is discussed.
The state of the fuel and power complex in the early 21st
century in Russia and countries of the former Soviet Union
dictates implementing a stringent engineering policy in the
area of fuel resources, in particular, calcination technologies.
Because of the low market cost of energy resources, of late
predominant in the Russian Federation, the domestic indus-
try has so far shown little interest in reducing the power sup
ply per unit product. Still, the trends towards a leveling of
prices of power resources in the internal and world markets
makes the reduction of energy expenditures and, conse
quently, enhancing competitiveness of domestic products on
the world market, an issue of urgent concern.
Modern calcination processes are implemented through
curtailing the consumption part of the heat balance of a par
ticular furnace or a heat-powered unit. The use of modular
high-temperature heat-insulating lightweight materials
(MHTLWM) makes it possible to reduce heat losses through
the refractory lining of the working chamber of a heat-pow
ered unit to an acceptable level of about 250 W/m
MHTLWM is thus a set of space-oriented multilayer refrac
tory heat-insulating materials assembled into a module and
aimed at solving a multifunctional engineering task in a par
ticular heat-powered unit. The development of a lining for
MHTLWM-based furnace and heat-powered units is a chal
lenging task which involves a compromise between the re
quirements, not infrequently contradictory, placed on the
refractories’ service .
It is practically impossible to functionally harmonize pa-
rameters for a lining made of a uniform material ; a way
out of this situation is to use a multilayer refractory lining. In
developing such a structure, the designer should take into ac-
count a number of parameters, such as: (i) the cost of refrac
tory materials available from domestic and foreign manufac
turers; (ii) operating temperature for a particular refractory;
(iii) heat conductivity, heat capacity, coefficient of linear
thermal expansion (CLTE), and mechanical strength of the
lining materials; (iv) resistance of refractories to thermo
chemical attack of the hot-furnace space; (v) environmental
requirements placed on the chemical composition of the re
fractory; (vi) temperature drop at the layer interface and the
associated therewith change in heat conductivity of the mate
rial; and (vii) resistance of the hot layer of the lining to abra
sive attack of the dust-and-gas furnace space.
In this work, we have estimated the MHTLWM service
life in terms of a criterion with a value of K = 1.0 which
parametrizes the loss of basic operational properties (heat ca
pacity, heat conductivity, and mechanical strength). This cri
terion has been derived using research data from the litera
ture [2, 4 – 7], statistical results of observations made on re
fractory materials at industrial plants in the Russian Federa
tion and republics of the former Soviet Union, as well as sta
Refractories and Industrial Ceramics Vol. 46, No. 6, 2005
1083-4877/05/4606-0432 © 2005 Springer Science+Business Media, Inc.
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