(112g) The Influence of Surface Tension On the Performance of Mist Separator, Part II
AIChE Spring Meeting and Global Congress on Process Safety
2013
2013 Spring Meeting & 9th Global Congress on Process Safety
Kister Distillation Symposium 2013
Distillation Troubleshooting and Lessons Learned
Wednesday, May 1, 2013 - 11:20am to 11:50am
The influence of surface tension
on the performance of mist separator
Part 2: Effect of density, wettability and co knit
material
Wolfgang Heikamp, Rhodius GmbH
Armin Pitzer, Rhodius GmbH
Attilio Praderio, Conoco Philipps
Prof. Dr. Michael Schultes, Raschig GmbH
In many chemical,
refinery and petrochemical processes wire mesh mist separators are installed to
remove fine droplet from gas streams. The design of these separators are mostly
based on the following equation using a wire mesh characterizing K- factor,
Vc= design flow velocity
This equation ( Saunders ? Brown ) became an
industrial standard to calculate a knitted wire mesh separator. There are
many individually proposal for the K
factor at different application.
Another design
criteria was initially recommended by Bürkholz, based
on many test datas, which can also used for the
estimation of the flooding velocity. Vc
as a function of the L/V liquid/gas mass flow ratio, the density difference
between liquid and gas Δρ and the liquid density ρL.
It has to be noticed that this equation does not take
into account any surface tension and wettability effects and is only proved for
air/water systems. Based on other gas/liquid separation processes it is well
known that low surface tensions (especially below 20 mN/m) are reducing the
flooding velocity of equipments.
In recent experimental studies with commercially
available mist eliminators the influence of
surface tension, wettability and co knit material on the flooding
velocity was newly investigated. A test rig was developed to study the flooding
performance of mist eliminators with surface tensions from 68 mN/m down to 12 mN/m.
The results of these experimental investigations will
be presented and compared to literature data. In addition an outlook will be
given for further work.
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