不均匀混合组分规整填料塔的发展.pdf

molei, 2010, Vol 44, N.6, Pp. 1-20 Chemical Engineering, 2010, Vol 44 No., P. 69876opliades Publishing, Ltd, 20
ISSN 0040-5795, Iheoretical Foundations of
Original Russian ext C A N. Pavlenko, r
okay
echerkin, V Ya. Chekhoich, under, P. Houghton, 2010, published in feoreticheskie O noy Khimicheskoi kh
Development of Mixture Composition Maldistribution
in a Distillation Column with Structured Packing
A N. Paylenkoa V. E. Zhukov N. I. Pecherkiny, V. Yu. Chekhoyicha
S. Sunder and P. Houghton
pr: Akademika Layrent'eva 1, Novosibirsk. 6.30090 Russ
Kutateladke Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences,
e-mail: pav/@itp.nsc /u
Received September 29, 2009
Abstract-the distribution of the composition of a mixture of Freons R-114 and R-21 over the cross section
of a distillation column filled with structured packing is experimentally studied. Results on the efficiency o
Freon mixture separation, the pressure drop in the packing, and the distribution of the local concentration of
the low-boiling component throughout the cross section and height of the structured packing are presented
The vapor phase load factor was varied over a wide range up to hydraulic flooding. According to the experi-
mental resullts, the large-scale maldistribution of the mixture composition occurs inside the packin over the
column cross section, even though the overall separation performance of the column is excellent. Maldistri
bution is observed throughout the total height of the column. The location of the large zones of maldistribu
tion significantly depends on the liquid and vapor flow rates
DOI:10.1134/S0040579510060060
INTRODUCTTON
tomography to studying a flow in packings with catalysts
and structured packing is known 5, 6. These methods
According to previous studies into the operation of
industrial distillation columns with regular or structured
focus on the liquid flow rate and accumulation within the
packing, but they do not give any information on local
packing, the efficiency of separation can often decrease compositions. This work investigates the formation of
recovery and purity of the final product. The fundamen-
large-scale maldistribution of the mixture composition
inside the structured packing of a distillation column
tal causes of a reduction in the separation efliciency of the The distributions ofthe mixture composition were deter
column are thought to be related to the transverse mald
istribution of the local flow rates of the phases and longi
mined by measuring the temperature fields in different
tudinal mixing. These phenomena relate to the vapor and
cross sections throughout the packing height
liquid flows inside the packing, and they lead to devia
The objective of the present study is to experimentall
tions of the recovery and purity of a product from the val- investigate the maldistribution of the composition of the
ues calculated for the ideal conditions of uniform distri- Freon mixture being separated in a distillation column
bution. There are many causes of nonuniform flows with structured packing
within the structured packing. The factor that has
received the most attention is the proper design and
installation of devices used for liquid and vapor distribu
METTHODS OF INVESTIG