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B2-1 Customized Rigid Discharge Electrodes Show
Superior
Performance in Pulp & Paper Applications
Mike Chambers
Southern Environmental, Inc.
Gary J. Grieco
Air Consulting Associates, LLC
John C. Caine
Southern Environmental, Inc.
Abstract
Over the last 30 years
aggressive, current-distributing type Rigid Discharge Electrodes (RDEs)
have been used in more than 1000 new and rebuilt Electrostatic
Precipitator (ESP) applications including recovery boilers, hogged
fuel boilers, lime kilns, cement kilns, refinery catalytic cracking
units, and coal fired power boilers.
In just the past 10 years, approximately 35 recovery boiler
ESPs with aggressive, current-distributing type RDEs were placed
into operation in the
U.S.
Historical results have been generally good, but new,
increasingly stringent requirements for reduced particulate
emissions from all sources has placed even more importance on
improved ESP performance. With
the development of Customized Rigid Discharge Electrodes (RDEs),
whereby several types of differently configured RDEs are used in a
single ESP chamber, designers have been able to meet this challenge
and provide new and rebuilt units that perform significantly better
than the older ESPs they replaced.
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B2-2 Numerical Modeling of Gas Distribution in
Electrostatic Precipitators
Stephen
L. Francis
ALSTOM Power
Inga-Lill Samuelsson
ALSTOM Power
Abstract
Recovery boiler electrostatic
precipitators (ESPs) often experience operational problems due to
difficult process conditions. Poor
ESP performance can have a significant impact on the paper mill
productivity and profitability.
Upgrading of ESP’s can be tricky and some attempts have not
always given the expected result, although new, improved
technologies have been utilized.
On occasions the reason for unexpected results after the
upgrade has generally been related to insufficient process knowledge
and a tendency to over simplify the upgrade requirements.
A successful ESP upgrade depends on the ability to choose the
best-suited equipment and to avoid pitfalls, such as irregular
current distribution, that otherwise could counteract the positive
effects of the upgrade.
Today there is a variety of equipment available that can be used to
enhance ESP performance. High-frequency
transformer-rectifiers (T/R’s), specially designed discharge
electrodes and custom configured T/R controllers are especially
efficient devices when the performance is disturbed due to corona
quenching and/or sticky dust as in many recovery boiler ESPs.
During recent
years a number of soda recovery boiler ESP’s have been upgraded
using the new equipment mentioned above.
The results have been excellent.
Emissions levels far below the guarantee levels at
significantly higher loads than originally designed for have been
reported.
This paper will
provide a recommended step by step procedure for accumulating
necessary information about the size, arrangement and performance of
the existing boiler/ESP system to assist in establishing the most
effective changes that should be made to the existing ESP to improve
performance. Recommendations
on possible upgrade approaches are included with results from
upgraded installation.
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B2-3
Develop ESP Energy Conservations Potential
Liu XueJun,
Hu HanFang
Li Zaishi
Wuhan
Safety
Environmental Protection Research Institute
Abstract
It comes to light that ESP is of
low resistance, outstanding energy conservation effect.
Make use of low resistance of ESP, treat thermal flue dust
without extra power, directly lead flue gas to ESP and purify, then
evacuate into atmosphere. That
much more stands out ESP energy conservation effect.
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B2-4
Improving ESP Performance by Optimizing Power Supply –
Industrial Applications
Jan R. Pajac
ESP Consultant:
Poland
Abstract
This paper gives a short
story of power supply system optimization for electrostatic
precipitators operating in different industrial applications.
In all that applications a brand new precipitators with
modern power supply systems and rotary hammer rappers were
retrofitted during the last four years.
After commissioning period the precipitators underwent an
extended optimizing procedure in order to obtain the highest
performance efficiency at the lowest power consumption.
A triboelectric and optical opacity meters were used to
continuously monitor the outlet gas concentration.
The case stories cover electrostatic precipitator
installations cleaning gases with a volume of 15 to 500 cubic
meters per second. In
all that cases but one an intermittent mode of power supply
operation gave unexpectedly high performance improvement.
In one case significant power saving was achieved only.
The rapping system was optimized to decrease the dust
reentrainment factor by means of cyclic operation interval changes
and controlled voltage decrease at rapping.
It has been
proved that precisely and well matched intermittent energization
parameters of electrostatic precipitator gives not only profitable
energy savins but in most cases it will give a serious performance
improvement.
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B2-5
Intelligent Centralized=Control and Management System for ESPs
Jiang Qing Long
Zhe Jiang Jia Huan Electronic, Ltd
Abstract
This paper deals with control
technology for power unit, coordination between HV and
LV
equipment, equipment
communication, remote supervisor system and so on for designing
ESP energization system.
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