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FP06 An
Analysis of the Effect of Carbon in Ash Levels on ESP Performance
Clive
Cottingham
Lodge Sturtevant Ltd. - Subsidiary of FLSmiljo
Abstract
The ever increasing demand of the Environmental Agencies has
lead to the widespread use of Low NOx Burners by Power
Station Utilities. This
has resulted in a general increase in the levels of Unburnt Carbon
in the Fly Ash passed to the Gas Cleaning Plant.
The most commonly used Particle Cleaning device on Utility
Boilers is the Electrostatic Precipitator.
High Carbon in Ash can lead to poor Precipitator performance.
The effect of high Carbon levels on a number of plants having
high and low resistivity fly ashes, has been investigated.
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FP07
Experiment on Collection Characteristics of 2-Stage
Parallel-Plate ESP in 0.01-0.1
µm
Particle
Size
Range
Kyung-Hoon Yoo
Air-Condintioning and Refrigerating Research Team Korea Institute of
Industrial Technology
Hyoseok Lee, Mansoo Choi and Joon-Sik Lee
Department of Mechanical Engineering Seoul National University
Myung-Do Oh
Department of Mechanical Engineering University of Seoul
Abstract
The
fractional efficiency of a 2-stage parallel-plate ESP was measured
with fine NaC1 particles in the size range of 0.01-0.1 µm.
The experimental results showed that the fractional
efficiency increased with decreasing particle size and then began to
decrease from the range between 0.02-0.03 µm, resulting from the
partial charging phenomenon where some of the incoming particles are
not charged at all.
This fact indicates the existence of a particle size showing
a maximum fractional efficiency in the fine particle sizes.
The existence of those particle sizes was confirmed through
the experiment.
It was also observed from the experimental results that the
particle size decreases when the corona wire voltage increases.
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FP08
Field
Test of An Electrostatic Precipitation Unit for Road Tunnel
Kyung-Hoon Yoo
Air-Condintioning and Refrigerating Research Team Korea Institute of
Industrial Technology
Kyung-Eung Tae
Dong-Suh Environment Technology Co.
Myung-Do Oh
Department of Mechanical Engineering University of Seoul
Abstract
Field performance test of an electrostatic precipitation unit
has been carried out to evaluate its adaptability to road tunnels.
The selected toad tunnel for the field test was the 3rd
Nam-San tunnel in
Seoul
. He type of the
electrostatic precipitation unit was 2-stage parallel-plate type
with a charging section. The
tested were the dust collection performance variation with time
using the Atmospheric dust-spot efficiency procedure of the ASHRAE
standard 52.1, the size distribution of the collected dust on
collection plates and the optimum period for cleaning the collection
plate. The results
showed that the initial efficiency was 86.5% and the 7 days-elapsed
85.8% for the nominal air velocity of 6m/s, indicating relatively
good agreement with numerical results.
The optimum cleaning period was selected as 7 days.
The amount of collected dust was 518g/unit and the size
distribution of the collected dust covered from 0.14 µm to 249 µm
with geometric mean of 17.51 µm.
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FP09
Characteristics of a Model Two-Stage PrecipitatorJohn J. Lowke and Richard
Morrow
Kazutoshi ASANO, Chang-rag CHOI and Kyoko YATSUKA
Yamagata University
Hun-chan LIM
Taegu Technical Junior College
Abstract
A compact ESP of two-stage type is widely used in working
environment where the production of ozone is extremely prohibited.
Since the working space in small factories is limited, the
ESPs are required to be compact and to handle highly contaminated
air. Thus, the high
efficiency of a precipitator is very important factor.
We have investigated the fundamental characteristics of a
model two-stage ESP, where the relative position of the ionizer and
the collector electrode section can be changed.
The experimental investigation revealed many interesting
results: The electric field in the collector electrodes affects the
corona discharge of the ionizer.
The concentration of particles after collector remarkable
varied in the region between the high voltage and grounded
electrodes. The
precipitation efficiency right behind the high voltage electrode is
much greater than that behind the grounded one.
The total precipitation efficiency, calculated by integrating
the particle concentration in whole measuring region, is greater
when the high voltage electrode of the collector is located behind
the discharge electrode. Thus,
the relative position of the ionizer and collector electrodes
affects the precipitation characteristics.
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FP10 Influence
of Contaminated Discharging Electrode and Collection Plates on
Particle Collection Characteristics of ESP
S. H. Kim and K. W. Lee
Kwangju Inistitute of Science and Technology Department of
Environmental Technology and Engineering
Abstract
Electrostatic precipitators (ESPs) are one of the most commonly
employed particulates control devices for colleting fly ash emission
from boiler, incinerators and from many other industrial processes.
They have many advantages of operating in a wide range of gas
temperature and achieving high particle collection efficiencies
compared with mechanical devices such as cyclones and bag filters.
Generally, the collection efficiency of ESP decreases as the
discharging electrode and collection plates are contaminated with
particulates. Thus, a
rapping system is needed for removing the collected particulates
periodically. While
there have been numerous theoretical and experimental studies on
particle collection characteristics of electrostatic precipitators,
relatively a small number of the studies addressed the affects of
particle accumulation at the discharging electrodes and the
collection plates. Both
phenomena are known to influence adversely the performance of
electrostatic precipitators. In
this study, a bench scale electrostatic precipitator was designed,
built and operated in a wind tunnel.
The influence of particle accumulation at the discharging
electrode and at the collection plates was experimentally studied.
The optimum ESP operating conditions were south for
maintaining relatively high collection efficiency during particle
accumulation.
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