OU07
New Technology Improves Electrostatic Precipitator
Performance
Rodney J Truce and Wade Reibelt
Baltec Systems Pty Ltd
Abstract
Legislative
requirements for reducing dust emissions from industrial processes,
such as smelters, refineries, kilns and boilers, have resulted in
significant capital costs. Many
of these processes use Electrostatic Precipitators to control the
dust emissions to the environment.
Operating problems can cause reduced electrostatic
precipitators performance resulting in high dust emissions.
Baltec Systems has developed a range of technologies which
can be selected, depending upon the application, to minimize the
effect of operational problems and to improve the performance to
meet reduced emission requirements. These technologies include gas
conditioning using SO3 or humidification, inlet burden
control using mechanical pre-collectors, mechanical enhancements to
improve gas flow and cleaning, and enhanced electrical systems using
the latest technology in energization systems and high performance
electrodes.
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OU08
Industrial-Scale Study of a Retrofitted Electrostatic
Precipitator
Maria Jedrusik
Technical University of Wroclaw
Institute of Heat Engineering and Fluid Mechanics
Jan Jedrusik
Thermal-Electric Power Plant
Marian Sarna
Electrostatic Precipitator Factory ELWO
Abstract
Investigated
was a retrofitted horizontal, three-zone electrostatic precipitator,
which was designed in the late 1970s.
the precipitator was installed after a bituminous-coal fired
140 MW boiler. Prior to
retrofit, the precipitator had spiked band corona electrodes which
were to provide a firm efficiency of 95%.
To make it comply with the enforced environmental standards
it was necessary to increase this value. The retrofit consisted of
replacing the spiked band corona electrode with a barbed-tube unit
of a special design, which raised the efficiency of the precipitator
to 99%, thus providing a dust concentration of 75 mg/m3
in the flue gas. These
values were achieved without introducing additional zones.
Prior to dust concentration measurements, we determined the
distribution of gas velocity at the inlet of an industrial
precipitator. The
efficiency of the precipitator was measured for various heating
power of the boiler to illustrate the improvement obtained.
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OU09
Some Investigations on ESP Unit : Determination and
Improvement of Collection
Efficiency
Avinash Chandra
Centre fo Energy Studies
Indian Institute of Technology
Abstract
Investigations have
been carried on an old ESP unit associated with a thermal plant to
improve existing particle collection efficiency.
The thermal plant uses typical Indian coal having low
calorific value and high ash contents (-40%).
The resistivity of fly ash is very high because of low
sulpher contents. Back
corona effects have been suppressed by incorporating microprocessor
based intermittent charging and rapping systems. The
effective migration velocities and as a consequence collection
efficiencies can be improved by choosing appropriate value of
intermittent charging time, magnitude and rapping rates.
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OU10
Recent Application of Moving-Electrode Type Electrostatic
Precipitator
Toshiaki Misaka,
Akio Akasaka, Hiroaki Yabuta
Hitachi Plant Engineering &
Construction ce., Ltd.
Tadashi Oura, Mitsugu Hirano, Minoru Yamazaki, Hiroshi Asano
Hitachi Plant KIDEN Engineering Co., Ltd.
Abstract
This
paper describes the recent applications of the electrode type ESPs
for fly ashes from pulverized coal fired utility boilers and for
sintering machine dust from iron making factories in
Japan
.
In
case of a 1,000MW coal fired power station, a moving electrode type
ESP was installed between a gas-gas heat exchanger and a wet type
desulfurizer at gas temperature of 90oC.
The test results showed that the reentrained dust from
collecting plates was significantly decreased, resulting in the
outlet dust concentration of less than 10mg/m3N.
For sintering machine exhaust gas treatment, a
pulse charging system was applied to the fixed electrode section
prior to the moving electrode section of ESP to attain higher
collection efficiency for high resistivity dust.
This combined system achieved an outlet dust concentration of
less than 10mg/m3N with a gas flow rate of 480,000m3N/h
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