DUST REMOVAL FROM AIR IN SYSTEMS
OF PNEUMATIC TRANSPORT OF LOOSE RAW MATERIALS
S. V. Éntin,
S. L. Kabargin,
D. A. Ermolychev,
Yu. V. Krasovitskii,
V. G. Ivanova,
B. G. Kolbeshkin,
M. N. Kuznetsova,
V. P. Dobrosotskii,
and V. G. Kol’tsov
Translated from Novye Ogneupory, No. 9, pp. 68 – 72, September 2007.
Original article submitted April 6, 2007.
A new method proven under production conditions is proposed for fine cleaning of air in systems of pneu
matic transport of loose materials consisting of the use of filters made of porous metals. A production scheme
is considered for a test-industrial unit and operating parameters are recommended.
Bag filters are used for dust removal from air in pneu-
matic transport systems. However, these filters have marked
disadvantages: the flat walls of the casing are designed for a
pressure of 2.5 – 3.0 kPa; valves for changing the direction
of the air stream do not provide sufficient sealing; switching
of the valve position and shaking of filter bags is accom-
plished from a mechanical drive which leads to rapid wear of
the rubbing parts and breakdown of the filter operating re-
gime; the method for feeding the dust and gas stream does
not provide preliminary separation and it does not avoid stir
ring of dust settling in a bunker [1 – 3]. The operating effi
ciency of these filters established, for example, in a pneu
matic transporter for alumina from silo towers to a bunker in
separate firing of chamotte for high-alumina articles, is 94%.
The residual dust content after filters exceeds health stan
Dust removal by a wet method under these conditions is
undesirable in view of the development of deposits that are
difficult to remove and there is an insufficient degree of
cleaning. Therefore there is interest in experimental verifica
tion of the possibility of using granular filters with a bonded
structure, in particular filters made of porous metals  ex
hibiting high strength, insensitivity to sharp variations in
pressure in the network, and high catching capacity [4 – 6].
The layout of an experimental device of such a filter in a
pneumatic transported for alumina from a silo tower into a
bunker of shown in Fig. 1.
The dust and gas stream is taken from the industrial gas
conduit 1 and it enters cyclone 2 of the TsN-15 type used as
the first cleaning stage. Dust captured in the cyclone is re-
moved through bunker 3, and the dust and gas stream con-
taining highly dispersed fractions of alumina enters the cy-
lindrical body of the cermet filter 4 intended for fine gas
cleaning. Direct feed of the dust and gas stream is possible
from an industrial gas conduit into the filter through a bypass
pipe. The filtering elements 5 used are six welded cylinders
with a diameter 90 and a height 600 mm with a wall thick
ness of 5 mm made from nickel powder of the fraction
0.1 – 0.2 mm. In order to reduce the degree of pore blockage
Refractories and Industrial Ceramics Vol. 48, No. 5, 2007
1083-4877/07/4805-0387 © 2007 Springer Science+Business Media, Inc.
OAO Semipluk Refractory Plant, GOUVPO Voronezh State En
gineering Academy, Tel’man Voronezh Coach Repair Plant, OAO
Voronezh Ceramic Plant, Russia.
Fig. 1. Layout of an experimental installation of filter made of po
rous metal in a pneumatic transporter for alumina from a silo tower
into a bunker.