ANALYSIS OF THE CONDITIONS OF THE PROCESS OF REGENERATION
OF HIGH-TEMPERATURE FILTERS IN THE CASE OF DUST COLLECTION
IN THE REFRACTORY INDUSTRY
S. Yu. Panov,
Yu. V. Krasovitskii,
and Z. S. Gasanov
Translated from Novye Ogneupory, No. 6, pp. 55 – 58, June, 2012.
Original article received March 2, 2012.
A study of different types of ceramic filter materials that have shown promise in applications in the tempera
ture range 500 – 850°C is performed. Features are illustrated and the problem of filtration at high temperatures
is demonstrated. Strategies for increasing the effectiveness of regeneration are proposed.
Keywords: high-temperature gas cleaning, ceramic filter materials, regeneration of filters
In recent years the appearance of new production pro-
cesses and increases in the cost of electricity have spurred
the development of high-temperature dust collection from
production gases and the aspirator effluents of refractories.
Existing practical experience gained from the use of
high-temperature gas cleaning has shown that the potential
advantages of such methods include not only recycling of the
heat of production gases, but also an increase in the service
life of equipment due to operation at a temperature that ex
ceeds the dew point, savings on capital outlays and operating
costs, and repeated use and recirculation of cleaned hot gases
Different types of equipment, including cyclone separa
tors, bag filters, and depth and electrical wave filters are used
for dust removal of high-temperature gases. The exceptional
promise of the use of depth filters for high-temperature gas
cleaning has been confirmed in recent years . Selection of
the filter material is the main problem of dust removal in this
case. The principal indicators of a filter are the effectiveness
of dust removal with acceptable hydraulic resistance, satis
factory service life of the material under working conditions,
high chemical resistance, and stable regeneration. Ceramic
filter materials, such as quartz fabric (samples K1 and K2),
quartz felt (sample K3), fibrous caked ceramic (sample K4),
and dense granulated filters (sample K5) have now been in
vestigated and all of these materials have shown promise for
use in the temperature range 500 – 850°C. Samples of struc-
tures of the test filter materials are shown in Fig. 1.
The filter fabrics were produced by means of twisting of
quartz fibers into a filament (yarn) with subsequent weaving
of the filaments into a fabric of twilled or satin structure. Ce-
ramic filters produced from fibrous caked ceramic of low
density exhibit high porosity (66% and higher) and hardness.
Such elements are produced in the form of slabs based on
aluminosilicate composites and are used in cleaning of high-
temperature gases to a residual concentration of 1 ´ 10
Dense granulated filters are fabricated from granules of sili
con carbide. These elements are relatively expensive and are
used in high-temperature (above 600°C) and chemically cor
rosive processes. A substantial growth in the hydraulic resis
tance DP (Fig. 2) associated with the increase in the viscosity
of cleaned gases and compression of the dust residue is ob
served in high-temperature filtration.
The nature of the variation in the hydraulic resistance for
structurally distinct materials exhibits different profiles
(Fig. 3). Materials with high porosity are characterized by a
practically linear growth in DP, whereas denser materials ex
hibit a profile in the form of an exponential dependence.
Woven filter materials are more amenable to regeneration
under conditions of high temperatures by comparison with
caked fibrous and granulated filters, since the fabric is de
formed in the course of regeneration and this leads to a
breakdown of the dense dust layer and its subsequent dis
persal. With the use of fabric filters at high temperatures,
however, there arise problems that are not substantial in the
Refractories and Industrial Ceramics Vol. 53, No. 3, September, 2012
1083-4877/12/05303-0206 © 2012 Springer Science+Business Media New York
FGBOUVPO Voronezh State University of Engineering Technol
ogies, Voronezh, Russia.