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FP01 The
Evaluation of Collection Efficiency on Electrostatic Precipitator by
Visibility
Index
Abstract
Abstract not available
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FP02 Fundamental Principles of Similarity with Reference to the
Collection Efficiency of an
ESP
Yakov S. Khodorkovsky and Michael
R. Beltran
Beltran Associates, Inc.
Abstract
The physical nature of mass transfer in the complex
electrodynamic and turbulent flow field is complicated and it has
not yet proved possible to set up an accurate equation for the
calculation of ESP collection efficiency.
The theoretical drift velocity, which is the most important
parameter of the Duetsch equation, differs very much from the
effective migration velocity obtained experimentally.
The new concept, discussed in the paper, is based on the
theory of dimensional analysis and on a large number of laboratory
tests. This allows us to
obtain a universal relationship between collection efficiency and a
new ESP nondimensional number which satisfies the conditions of
similarity.
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FP03 Onset Voltages of Back
Corona
for Various Layer Thickness and Gas Temperature
in Wire-Cylinder Type Electrostatic Precipitator
H. H. Park, S. S. Kim
Department if Mechanical Engineering, Korea Advanced Institute of
Science and Technology
Abstract
We performed the study of the back corona discharge in the
wire-cylinder type electrostatic precipitator (ESP) for the various
gas temperature and layer thickness.
The well-characterized fluidized bed combustion (FBC) fly ash
was used for the test particle.
In this study, the gas temperature was varied from 100oC
to 250oC and the layer thickness was varied from 0µm to
301µm. As increasing
the temperature, the back corona starting voltage was decreased.
Also we examined the back corona discharge effect for the
different dusty layer thickness.
As increasing the dust layer thickness, the back corona
discharge appeared at the higher applying voltage.
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FP04
The
Role of
Corona
Wind in Electrostatic Precipitation
John J. Lowke and Richard
Morrow
CSIRO Telecommunications and Industrial Physics
Abstract
The conventional view implied in the term “electrostatic
precipitation” is that dust particles become charged from the
corona current and then are attracted by electrostatic forces to the
collector plates for precipitation.
However, we have come to the view that a significant
mechanism in sweeping the dust particles both to and from the plates
is that of corona wind. We
have performed measurements of the corona wind in a model
precipitator using an optical fibre anemometer.
We obtain velocities of the order of 2 m/s for the corona
wind associated with voltages of 50 kV on a conventional
electrostatic precipitator wire, which is of the same order of the
usual imposed flow velocities of 1 m s -1.
In addition we have performed two dimensional fluid dynamic
calculations incorporating corona wind with an imposed cross flow.
An improved design of the plate configuration of
electrostatic precipitators is suggested to utilize the effect of
corona wind to assist the transport of particles to the plates.
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FP05 Influence of Lypophile on Preventing Re-entrainment in Spraying
Surfactant Type Electrostatic
Precipitators
Yoshihiro Kawasa*, Wateru
Jindai*, Akinori Zukeran*, Yoshiyasu Ehara*, Tairo Ito*, Takeo
Takahashi**, Takeshi Takamastu**
* Department of Electrical and Electronics
Abstract
The re-entrainment phenomena by rely of collected diesel exhaust
particles (DEP) may be solved by increasing the adhesive force
between particles and collecting electrodes.
Therefore, we have proposed Spraying-Surfactant-Type ESP
spraying pure water with surfactant in the gases at the upstream of
ESP. As a result, the
collection efficiency increased for the particles larger than 1 µm.
However, the mechanism of preventing the re-entrainment due
to spraying the water with surfactant has not been clear.
In the work, we investigate the influence of
surfactant’s lypophile on preventing the re-entrainment.
The present version of ESP is Two-Stage-Type with the
precharger and the collecting section.
The particle size distribution of the electrodes is measured
and the agglomerated particles are observed by the scanning electron
microscope (DEM). As
results, when high lypophile surfactant is sprayed to the gases at
the upstream of ESP, the number of larger particles which are
agglomerated on the electrode decreases and the shape these
particles becomes nearly spherical.
These results indicate that spraying the high lypophile
surfactant to the gases at the upstream of ESP prevents the
agglomeration on the electrodes and the re-entrainment.
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