DEPENDENCE OF FUEL CONSUMPTION ON THE PRODUCTIVITY
OF A SHAFT FURNACE DURING PREPARATION OF A MAGNESIUM
N. A. Tyutin
Translated from Novye Ogneupory, No. 9, pp. 36 – 38, September 2007.
Original article submitted April 24, 2007.
Stages of heating are considered for heat treatment of three forms of product made from magnesium oxide in a
shaft furnace reactor: porous, dense, and ultra-dense. An equation is composed for the heat balance of the
heating stage of heat treatment of products made from magnesium oxide in a furnace reactor, as a result of
whose solution a calculation equation is obtained for heat consumption with a linear dependence on furnace
In refractory technology a shaft furnace may be used for
preparing from magnesium oxide three forms of product of
different density: porous, dense, and ultra-dense . Each
form of product corresponds to the type of heat treatment for
the original material in a shaft furnace reactor with indivi-
dual dependence of heat consumption on its productivity.
Heat treatment for each form of product differs in the level of
preparation of the original material, and the level and dura
tion of the thermal regime.
The maximum level of thermal regime in preparation of
porous, dense, and ultra-dense products is found in the
ranges 1200 – 1300, 1700 – 1800, 1800 – 2000°C and above
respectively. All three types of heat treatment for the product
consist of two successive stages: heating and cooling the
original material in a reactor. Physicochemical transforma
tions occur in the materials.
In order to obtain a porous product the heating stage con
sists of two successively occurring stages in the temperature
field: heating and decomposition of the original material
) to porous solid (MgO) and gaseous (CO
nents. In preparing a dense product the heating stage consists
of three successively occurring phases in the temperature
field: heating, decomposition of the original material (MgCO
into porous solid (MgO) and gaseous (CO
) components, and
sintering of the porous solid (MgO) component. In preparing
ultra-dense material the heating stage may consist of two or
three successively occurring phases in the temperature field
in relation to the content of the gaseous (CO
) components in
With absence from the porous product of gaseous com-
ponents the heating stage will consist of two successively oc-
curring stages: heating and sintering of porous product (MgO).
With presence in the original material (MgO + MgCO
of some amount of gaseous component the heating stage will
consist of three phases, similar to the phases in preparing
dense product, but with significantly less time for occurrence
of the decomposition phases for the non-porous part
) of the original material into porous solid (MgO)
and gaseous (CO
Heat treatment of the original material in a shaft furnace
reactor is accomplished in a counterflow for the working me
dium with saturation of it by dispersed solid (MgO) and ga
) components of the this material. The heat con
sumed in order to obtain a working medium made of a mix
ture of combustion products and air, used in the reactor for
heat treatment of each form of product in the heating stage, is
determined from an equation for the thermal balance of this
stage of the corresponding process in the reactor .
The accepted units for equations of the thermal balance
of the heating stage in a reactor for each from of product are
the heat of fuel combustion products Q
, physical heat of the
, heat of primary air Q
, and heat of secondary air Q
Consumption units of the thermal balance of the heating
stage in a reactor consist of heat consumption: in processing
a product Q
, and in loss of dust-carrying product Q
, with a
Refractories and Industrial Ceramics Vol. 48, No. 4, 2007
1083-4877/07/4804-0259 © 2007 Springer Science+Business Media, Inc.
OAO VOSTIO, Russia.