REDUCING THE POWER CONSUMPTION OF VENTILATION SYSTEMS
THROUGH FORCED RECIRCULATION
Yu. G. Ovsyannikov,
A. B. Gol’tsov,
A. S. Seminenko,
K. I. Logachev,
and V. A. Uvarov
Translated from Novye Ogneupory, No. 10, pp. 64 – 68, October, 2016.
Original article submitted February 25, 2016.
A method of reducing dust emission and the power consumption of a ventilation system by improving the
management of forced delivery of recirculated air to the charging trough is proposed. A portion of the venti
lated air is fed to the charging trough, which tends to reduce the volumes of ejected air entrained by the stream
of free-flowing material. The influence of the geometric parameters and the flow rate of the recirculated jet on
the volume of discharged air are investigated by means of computer modeling.
Keywords: dust-removal ventilation, ventilation shelter, recirculation, dust emission, volumetric flow rate,
free-flowing materials, entrainment of air by a stream of solid particles
Technological processes in the manufacture and treat-
ment of free-flowing materials in different branches of indus-
try (construction, mining, metallurgy, coal, etc.) are accom
panied by intensive release of dust [1 – 3], the main source of
which is ejection, or entrainment of air by a stream of
free-flowing material in the air, which is responsible for the
significant scientific interest in the phenomenon [4 – 8].
The most effective method of combatting dust emission
is through the use of systems of integrated dust removal,
which comprises ventilation systems, means of combatting
secondary dust emission, and general ventilation by dilution.
In addition to great dust discharges into the atmosphere,
which have a negative effect on ecological conditions, the
use of ventilation systems entails substantial direct energy
costs, which in a number of cases may reach 20% of the pro
duction capacities [9, 10]. In the winter period the use of
ventilation systems produces a growth in heat consumption
to warm up the incoming air. The power consumption of a
ventilation system depends to a significant extent on the flow
rate of the ventilated air, the principal component of which
are the volumes of air ejected and infiltrated through leak-
ages in the ventilation shelter.
Recirculation, or return of a portion of the ventilated air
to the discharge trough, is one of promising trend in efforts
aimed at improving continuous-stream ventilation systems
(Fig. 1a ). Recirculation may be created on the basis of natu
ral and forced designs.
Natural recirculation created through installation of by
pass (diversion) channels  or through the use of the per
forated charging tube in the round bypass chamber [12, 14]
can be realized by reducing the pressure that arises along the
height of the charging trough.
Unlike natural recirculation, forced recirculation makes
it possible to decrease emission from a ventilation system
more substantially and reduce it to the magnitude attributable
to the leakages in the shelters as well as affect the process by
which the ejected stream of air is formed.
The objective of the present study is to present a numeri
cal evaluation of the proposed method of delivery of a
recirculated stream as a way of influencing the process by
which volumes of ejected air is created.
Refractories and Industrial Ceramics Vol. 57, No. 5, January, 2017
1083-4877/17/05705-0557 © 2017 Springer Science+Business Media New York
FGBOU VO Shukhov Belgorod State Technological University,