PNEUMATIC TRANSPORT OF EXPLOSIVE AND HOT BULK MATERIALS
S. Ya. Davydov
and I. D. Kashcheev
Translated from Novye Ogneupory, No. 8, pp. 23 – 27, August, 2011.
Original article submitted September 18, 2010.
Detailed descriptions are given of the design, characteristics, and operation of a vacuum system for the pneu
matic transport of explosive powders. Results are also presented from the design of a forced-air system for
transporting converter dust and pulverized coal fuel.
Keywords: pneumatic transport, conduit, explosive and hot materials, nitrogen-air mixture, blast furnace,
Vacuum pneumatic transport is used when it is necessary
to collect the material being transported from several differ-
ent locations and deliver it to a single location. The pressure
drop is 40 – 80 kPa, so that the material can only be trans-
ported for short distances with a relatively small elevation
When plans were being drawn up for the vacuum
(forced-draft) pneumatic transport of powdered aluminum
(Table 1) in the aluminum powder shop at the Bogoslovsk
Aluminum Plant (a subsidiary of the Siberian-Urals Alumi-
num Company (SUAL)), planners drew on the experience
gained from the operation of the vacuum-transport system at
the Pavlograd Chemical Plant. This system was designed
with special emphasis having been given to its fire-proofing
and blast-proofing. Each pipe in the system is regarded as a
continuous electrical circuit over its entire length and should
be grounded at least two points. Tie plates should be installed
on all flanged joints of the equipment, and all of the instru
ments, equipment, and flexible tubing should also be
grounded at the sites where they are installed.
Systems which pneumatically transport coarse and fine
fractions of aluminum powder consist of a unit that collects
powder from a screen, a conduit, a unit that includes a stor
age hopper where the powder can be deposited, and equip
ment to create a vacuum.
The powder collection unit (Fig. 1) is a 70-kg-capacity
container with a T-shaped cover that the powder enters from
above. The transporting agent (a nitrogen-air mixture) is
sucked into the horizontal part of the tee on one side, while
the other side is connected to the conduit by means of a flexi
ble tube and a valve with its own drive. The container is con
nected to the screen with the use of a flexible insert. The
transporting agent is delivered from a gas line positioned af-
ter the dust-cleaning system.
The conduit has an initial diameter of 0.1 m and then ex-
pands to diameters of 0.125 and 0.15 m. The conduit and its
bends are made of stainless steel to avoid having the powder
contaminated by other metals.
The material that is transported consists of fine and
coarse fractions of aluminum powder (see Table 1) which is
loaded into reusable containers (50-liter metal barrels). The
barrels are weighed, placed on a cart, and taken to section
No. 2 for further processing. All of the components and
mechanisms of the pneumatic transport system are remotely
controlled from a panel located in the same room in section
No. 2 where the powder is deposited.
Refractories and Industrial Ceramics Vol. 52, No. 4, November, 2011
1083-4877/11/05204-0248 © 2011 Springer Science+Business Media, Inc.
Ural Federal University, Yekaterinburg, Russia.
the screen, %,
no more than
PA-0 2.0 5
PA-1 045 12
PA-2 025 10
PA-3 016 10
PA-4 01 15
AKP 0125 9
the screen, %,
no more than
PA-1 063 100
PA-2 045 100
PA-4 014 100
AKP 01 15
TABLE 1. Granulometric Composition and Bulk Density* of Alu
* The bulk density of powders PA-1, PA-2, PA-3, and PA-4 is