COMBINED HIGHLY RESISTANT LINING OF FURNACE CHAMBER FOR
DRYING NUTRITIONAL YEAST SUSPENSION
V. V. Slovikovskii
and A. V. Gulyaeva
Translated from Novye Ogneupory, No. 9, pp. 7 – 10, September, 2016.
Original article submitted June 6, 2016.
Service conditions for the lining of SRTs12.5/1500 NK furnace chamber in the Mozyr’ Nutritional Yeast Plant
(MZKI), the nature of its breakdown, and combustion processes are studied. A refractory adhesive is devel
oped and tested as a brickwork mortar. Use for impregnation of a furnace refractory lining of an alu
minium-chromium phosphate binder of optimum density makes it possible to reduce refractory porosity and
thereby increase strength by 30%, and thermal shock resistance by a factor of three. A lining of highly resistant
mullite-corundum refractory based on fuzed materials is tested: a “chequerboard” furnace brickwork scheme
is accomplished; a protective highly-resistant coating is used for repairing local breakage. As a result of intro
ducing these measures combustion chamber lining life is increased by a factor of 2.5 – 3.0, i.e., from 2 – 3 to
9 – 10 months.
Keywords: combustion chamber, burner unit, lining, chamotte, refractory cement, mullite-corundum refrac-
tory, aluminium-chromium phosphate binder, drying unit.
According to state statistical data within Russia seven-
teen plants operate for production of nutritional yeasts
(Barnaul Yeast Plant, Volga Hydrolysis-Yeast Plant, Rostov
Yeast Plant, Yeast Plant (Irkutsk), Krasnoyarsk Yeast Plant,
etc.). Drying units are used in order to dry product. A drying
installation is a heat utilization unit including the following
main assemblies: two furnaces, operating on fuel oil, an
SRTs type drier, a group of cyclones, and nine forced draught
machines with an atomizing mechanism. A unit is intended
for drying a suspension (nutritional yeast) in a sprayed con
dition and is a continuously operating installation. A cyclone
furnace, intended for burning fuel (oil), i.e. for transfer of
bonded energy from fuel into thermal energy with high-tem
perature gases. The chamber volume is 23 m
, and the heat
ing capacity of 20 kcal/h.
Fuel oil grade 100 is burnt in furnaces and there is simul
taneous disposal of exhausted drying agent. Flue gases,
formed during fuel oil combustion, with a temperature up to
1200°C are mixed with exhausted heat carrier, emerging
from the furnace cooling “jacket”, and enter the pipe space of
an air heater. In the heater drying agent is heated from
80 – 100 to 450°C and through an air conduit enters the dry
ing chamber. The mixture of flue gases and exhausted heat
carrier, giving heat to the drying agent air heater, is cooled to
150 – 200°C and by a furnace exhaust fan is discharged
through the exhaust chimney to atmosphere.
The lining of the furnace chamber is made entirely from
chamotte brick grade ShA-1 (GOST 86973) based on a
chamotte mortar with air hardening cement. The lining
scheme is shown in Fig. 1. The most intense lining wear is in
the upper part of the cone. Due to local burning the lining
loses strength and there is collapse up to deformation and
melting of the metal casing, which leads to stoppage of the
production process and prolonged repair work. The tempera
ture in a burn-out zone exceeds 1200°C and the chamotte
brick is severely melted (Fig. 2a ).
At its surface there is not only severe melting, but also
presence of a considerable amount of cracks, and also pene
tration of combustion products to a depth of about 50 mm
and loosening of brick at the working surface. There is evap
oration of SiO
and formation of porous silicon carbide,
which in turn separates from a brick surface (Fig. 2b ).
Taking account of experience of using binder mortars in
a lining of nonferrous metallurgy equipment and the cement
industry, the authors have proposed for creation of a stronger
monolithic lining use of high-temperature adhesive as a
brickwork mortar, which the authors have used in lining units
Refractories and Industrial Ceramics Vol. 57, No. 5, January, 2017
1083-4877/17/05705-0445 © 2017 Springer Science+Business Media New York
FGAOU VPO Ural Federal university, Ekaterinburg, Russia.