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ICESP IX CONFERENCE PAPER ABSTRACTS A 26-30 SERIES

Held in Kruger Gate, Mpumalanga, South Africa
May
May 17 - 21, 2004

The International Conference on Electrostatic Precipitation (ICESP) is the official conference of the International Society for Electrostatic Precipitation (ISESP).  

The following is a list of the Abstracts for the A 26-30 Series papers from the IX ICESP Conference.  

A26  Electrostatic Precipitators, Bag Filters and Emission Standards for Coal-fired Power Plants in China
Wang Liqian, Zhang Dexuan, Yang Xiuyun

Abstract
From 1980 to 2003, power installed capacity in China grown from 65,869 MW to 384,500 MW, near 6-foldes increased. By the end of 2003, coal-fired power increased to 285,640 MW, thus induced continuosly increased air pollutions.Accompanying  the  emission  standards  from  tolerant  to  stringent,  high efficiency  dust  collectors  gradually  played  dominative  role.  From 1955, precipitators went into Chinese power plant and by 2003 it already shared 82% of the total coal power capacity. For precipitators, very difficult coals and rather favorable coals were encountered. In 2001, first “successful” bag filter put into operation, after that, it grown very rapidely. From January  2004, new coal power emission standard of 50mg/m3   implements, considering the big variety of Chinese coal, the choose between precipitator or bag filter will be   worth considering. An primary economic coparison is given.


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A27  SO3 Injector Fouling In Flue Gas Conditioning Systems
Michael Vukmir & Michael W. Rollock, BS ChE.

Abstract
SO3 injection probe fouling is a major concern in the operation and maintenance of SO3 flue gas fly ash conditioning systems.   The source of the problem is moisture in the combustion air used by the sulfur burning SO3 gas generator systems.    Proper SO3 injector probe operating temperature control and operation can alleviate many of the problems.    The use of dry combustion air in combination with conventional SO3 flue gas conditioning systems has the potential  of  reducing  both  the  quantity  of  sulfuric  acid  generated  and  the  dew  point temperature of the sulfuric acid mist formed in the hot gas piping and SO3 injection probes.The advantages of dry combustion air will be in reduced injector fouling - resulting in lower maintenance costs and improved fly ash conditioning performance.   The lower sulfuric acid dew point temperature of the SO3 gas will offset the additional operating costs associated with  producing  the  dry  combustion  air  and  can  also  reduce  the  capital  costs  for  new installations when combined with SO3 gas flow splitting and biasing technology. 

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A28  FLUE  GAS  CONDITIONING  -  SO3  INJECTION  RATES  FOR  SOUTH AFRICAN COAL ASHES
Frans Bosch

Abstract
Flue gas conditioning at some Eskom power stations has required lower SO3 injection rates than those predicted by models or FGC vendor experience.   The required injection rates were about a third of predicted, which was an unexplained anomaly.    The paper offers an explanation and proposes a method for determining whether a coal ash will behave “conventionally” with SO3 FGC or will require a lower than expected injection rate.

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A29  The Newest Technical Results Capable of Remarkably Increasing ESP Efficiency
Wang Weixue, Fang Aimin,  Cao Feng

Abstract
Since the middle of 1980s, State Power Environmental Protection Research  Institute  has  been  dedicating  its  efforts  to  the  research  in increasing efficiency of ESPs, especially those operating under the worst
conditions  or  in  collecting  dusts  with  high  specific  resistance.  The profound research is developed in the respects of improvements of power supply’s characteristics, adoption of more ideal modes of energization,
elimination  of  back  corona  hazards  etc.  and  a  series  of  essentially practical technical results have been achieved.


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A30 Improved Control of Primary Fine Particulate Emissions with Electrostatically Augmented Fabric Filtration
Robert F. Heaphy, Kenneth M. Cushing, Wallis A. Harrison

Abstract
Southern Research Institute (SRI), under a cooperative agreement with the United States Environmental Protection Agency (USEPA), is reporting the results of an investigation of electrostatically stimulated fabric filtration (ESFF) for particulate control on a utility boiler fired with pulverized coal (2001-2003). In pilot-scale testing at the SRI Combustion Research Facility and in a long-term, pilot-scale demonstration of ESFF at a full-scale utility boiler, ESFF consistently outperformed conventional fabric filters (2001-2002).For these tests particle charging was accomplished with high voltage electrodes mounted outside of, but co-axially, with the pulsejet filter bags. With ESFF, total mass emissions without cleaning were one-fourthto one-fifth of those for a conventional pulse-jet fabric filter (FF).   Penetration of particles smaller than one micrometer was about one order of magnitude less with ESFF. In addition, pressure drop increased about one-third as fast with ESFF as compared with FF, reducing the frequency of bag cleaning.   Since a significant fraction of the total particulate emissions occur as a consequence of cleaning, the reduced cleaning schedule in itself leads to lower emissions of all particle sizes. Recently, additional testing (2003) has been completed using a cooled-pipe precharger to impart charge to the fly ash particles. The previous high voltage electrodes were replaced with large diameter electrodes intended to produce only a collection field.   Improved baghouse performance was observed with this arrangement, producing filter drag values 50 to 60% lower than those experienced during normal baghouse operation. Of special note was the observation that significant performance improvement was measured with only the collection field energized (no precharging of the fly ash).

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