Russian Journal of Applied Chemistry, 2013, Vol. 86, No. 8, pp. 1190−1196.
Pleiades Publishing, Ltd., 2013.
Original Russian Text © A.G. Laptev, M.M. Basharov, 2013, published in Zhurnal Prikladnoi Khimii, 2013, Vol. 86, No. 8, pp. 1214−1220.
OF SYSTEMS AND PROCESSES
Efﬁ ciency of Aerosol Deposition in Gas Separators
of Various Designs
A. G. Laptev and M. M. Basharov
Kazan State University of Power Engineering, Kazan, Tatarstan, Russia
Received July 12, 2013
Abstract—Mathematical model of gas treatment to remove a ﬁ nely dispersed phase, based on the theory of tur-
bulent migration of particles, is discussed. In the approach used, the aerosol separation is considered as a kind of
a diffusion process using equations of the mass transfer theory. Expressions are presented for calculating the gas
cleaning efﬁ ciency in tubular, vortex, and packed gas separators. A speciﬁ c feature of these expressions is that the
calculations can be performed using the hydraulic resistance of the working zone of the apparatus.
Gas treatment to remove solid and liquid mechanical
impurities is an important item in making up a set of
process equipment in chemical, petrochemical, and
gas industry and in related branches. The diversity of
operation conditions and purposes of the equipment
make it necessary to develop new designs of separating
apparatuses and to improve methods for calculating their
performance. Much experience has been accumulated
by now in solution of these complex problems. Several
monographs [1–5] and handbooks [6–8] have been
published recently. However, despite considerable
achievements in the theory and practice of gas cleaning,
many problems concerning calculation of combined gas
separators, especially for removing particles smaller
than 3 μm, still remain to be solved.
Gas cleaning efﬁ ciency. The main problem in
choosing designs of gas-separating devices for given
process conditions is reliable calculation of the efﬁ ciency
of the dispersed phase separation. The separation
efﬁ ciency can be determined from the content of the
dispersed phase in the gases at the inlet and outlet of the
gas cleaning apparatus:
η = (Q
) = 1 – (Q
where с is the particle concentration (kg m
), Q is the
gas ﬂ ow rate (m
), and subscripts i and f refer to the
initial and ﬁ nal values, respectively.
Usually, it is assumed that Q
There are many mechanisms of particle deposition:
gravity, inertial, turbulent, centrifugal, etc. The
calculation of the majority of industrial apparatuses
is based on a combination of different deposition
principles. Correspondingly, the separation efﬁ ciency
depends on various parameters.
When several mechanisms act simultaneously and
when the treatment is performed in several series-
connected apparatuses (zones), the overall efﬁ ciency is
an additive quantity:
= 1 – ∏
(1 – η
is the efﬁ ciency of separation by ith mechanism
in ith apparatus (zone).
We applied in this study the approach used by
F.P. Zaostrovskii and K.N. Shabalin (1951–1953) and
later developed by E.P. Mednikov and other authors [1,
2, 9–12], when the aerosol deposition is considered as
a kind of diffusion process and is described using the
equations of mass transfer and turbulent migration of