Russian Journal of Applied Chemistry, 2011, Vol. 83, No. 3, pp. 533−538.
Pleiades Publishing, Ltd., 2011.
Original Russian Text
A.S. Pushnov, E.N. Petrashova, M.G. Lagutkin, 2010, published in Khimicheskaya Promyshlennost’, 2010, Vol. 87, No. 6, pp. 317−323.
PROCESSES AND DEVICES
OF CHEMICAL MANUFACTURES
Gas Distribution in the Layer of Irregular Ring Nozzle
A. S. Pushnov, E. N. Petrashova, and M. G. Lagutkin
Moscow State University of Environmental Engineering, Moscow, Russia
e-mail: firstname.lastname@example.org, email@example.com
Received May 31, 2010
Abstract—Results of experiments on evaluation of velocity ﬁ elds in the apparatus of diameter 98 mm loaded
with irregular ring nozzle of different type so that the ratio of the diameter of the apparatus to the diameter of the
packing D/d = 10 are analyzed in the article. The signiﬁ cant inﬂ uence of the walls limiting the layer of packing
on the uniformity of distribution of the velocity ﬁ eld in the cross-section of the apparatus with packing is shown.
Raschig rings, rings of MS type and rings of N1 type of dimensions 10 × 10 × 0.9 mm made of metal were used
as packing. The data obtained on Raschig rings were compared with published data.
Apparatuses with packing for processes of the
heat and mass exchange, for the capture of gaseous
toxic components of exhaust gases are widely spread
in chemical, petrochemical, and other branches of
the industry. The efﬁ ciency of the work of packing
apparatuses directly depends on the distribution of
velocity ﬁ elds in the cross-section of apparatuses.
Experimental data on velocity ﬁ elds in the layer of
ceramic packing from Raschig ring and Berl saddles
with dimensions 10 × 10 × 1.5 and 12.5 respectively is
given in [1–4].
Results of these experiments are illustrated in Fig.
1 in form of dependence of dimensionless ratio W
from the current radius of the column r/R
; here W
m/s is the local velocity of the gas ﬂ ow in i-measuring
ring of the current radius (r, m); W
, m/s is the average
velocity with respect to the total cross-section of the
empty apparatus; R, m is the radius of the apparatus.
As it is seen from data illustrated in Fig. 1, the saddle
ceramic packing provide more uniform distribution of
velocity ﬁ elds in the device in comparison with ceramic
Raschig rings with close dimensions. This indicates
the more uniform distribution of saddle packing in the
device. At the same time these data despite limitation in
types of studied packing shows signiﬁ cant difference in
ﬂ ow velocities close to walls and in the central part of the
device. These differences can reach four times (Fig. 1).
Undoubtedly, such large nonuniformity in distribution
of the gas ﬂ ow by cross-section of the device would
negatively inﬂ uence the realization of processes of mass
exchange  as well as adversely affect the accuracy of
calculations of packed devices.
In this work the results of experiments on blowing
of cylindrical apparatus of diameter 98 mm loaded with
the layer of irregular metallic packing of different type
in order to ﬁ nd reasons of the low efﬁ ciency of mass
Fig. 1. Radial distribution of the velocity range W
) in the layer of ceramic nozzles : (1) Raschig rings;
(2) Berl saddles.
0.2 0.6 1.0