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ICESP VII CONFERENCE PAPER ABSTRACTS OU-3 SERIES

Held in Kyongju, Korea
September 20-25. 1998

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 OU-3 Series papers from the VII ICESP Conference.  

OU11  Automated Cleaning of Electrostatic Precipitators
Gernot Mayer-Schwinning
Lurgi Umwelt GmbH

Abstract
Quite frequently electrostatic precipitators are closed down in connection with scheduled or unscheduled shutdowns.  In this process, the ESP must be cleaned down with water or otherwise to remove particles from the collecting plates.  Today most cleaning procedures in this regard involve various types of manual systems.

This manual involvement takes place under unsafe and unhygienic conditions.  The cleaning process is cumbersome and time consuming and the environmental/ legal development in many countries either has or will make serious restrictions for accepting personnel entry into ESP not yet cleaned.

This technical paper give a brief introduction in how this process can be improved by using the patented Toftejorg ESPRO® cleaning system especially developed for automatic cleaning of electrostatic precipitators

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OU12  Wet ESPs Status and Latest Development in the Field of Aerosol Collection
Gernot Mayer-Schwinning
Lergi Umwelt GmbH

Abstract
The application and construction of electrostatic precipitators (ESPs), constitutes one of the oldest activities of Lurgi.  Dry-type ESPs have been in use since 1914 and as early as in 1920 the first wet-type precipitators were commissioned to separate liquid particles (acid mist, tar).

In the chemical industry, it is general practice to use wet-type ESPs for gas cleaning systems upstream of H2SO4 contact plants, for the elimination of HCI and NH4C1 and, in the non-ferrous industry, for cleaning roaster off gases downstream of copper, lead and zinc smelters.

Furthermore, in recent years wet-type ESPs have been used as polishing units downstream of hazardous waste and liquid residue burning incinerators.

The latest applications are the removal of sulfuric-acid aerosols downstream of high-sulfur fuel reactors in order to reduce plume visibility.

In the past years, a novel high-tension supply and control system has been purpose-developed for wet-type ESPs.

This paper will describe different ESP designs that are available, as well as special application features.

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OU13  Experimental Tracking of Dust Properties Related with ESP Performance Along Full Scale Units
Li Jie, Li Guofeng , Wang Ninghui
Electrostatic Institute
Dalian University of Technology

Abstract
The results of a complete tracking program of physical and chemical properties of dust samples coming from six full scale coal ESPs are presented.

Studied fly ashes come from parent coals of different rank.  Dust samples have been taken along the whole ESP, including ESP inlet (isokinetic sampling in flue gases), collecting plates, hoppers and storage silos.

Analytical work includes standardized determination of physical and chemical ash properties; in-situ resistivity measurements; advanced chemical, morphological and mineralogical analysis; and measurement of fly ash cohesion.

Some interesting findings about evolution of dust properties inside an ESP will be presented.  For instance, extension of particle agglomeration processes in plate curtains, variation of dust cake porosity and bulk density, and chemical species enrichment or depletion on plate curtains collected layers.  The dependence of these processes with parent coal and their effect on filter performance are analyzed.  Also their relation with ash resistivity and with measured ash cohesion is assessed.

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OU14  Colder Side Electrostatic Precipitator of Advanced Flue Gas Treatment System for Coal-fired Boiler
Avinash Chandra
Centre fo Energy Studies
Indian Institute of Technology

Abstract
To cope with the rigorous restrictions imposed on the coal-fired power plants for the environmental protection, a simplified, compact and economical flue gas treatment system called “Advanced Flue Gas Treatment System” has been developed and put into practical use.

The system is featured for its high dust collection efficiency with the use of “Colder side ESP” placed downstream of the GGH to bring down the flue gas temperature to 90oC and thereby achieve the lower dust resistivity for improved dust collection efficiency and also the system economy with deletion of de-dusting equipment in cooling tower of FGD and wet type ESP as compared with the conventional system.

The first commercial plant with “Colder side ESP” has been already applied for coal-fired power plant in Japan and satisfactorily operated.  The System has been also adopted for the next new power station and it is becoming a mainstream in this field.

This paper introduces the technological features of Colder Side ESP and the recent trend of electrostatic precipitator for coal-fired power plant in Japan .

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OU15  Dual FGC Solving ESP Performance Problems
Carsten R. Lund
FLS milje als
Martin Selby
National Power Ltd.
Clive Cottingham
Lodge-Sturtevant Ltd.

Abstract
Increased use of NOx reducing measures have increased the focus on Electrostatic Precipitator (ESP) performance problems related to high levels of Unburned Carbon (UBC) levels in fly ash (FA).  Similar problems can be encountered when a boiler is firing anthracite coal.  This low volatile containing coal is difficult to burn out which in turn can cause high levels of UBC in the resulting FA and reduced ESP performance.  In extreme cases a solution to the ESP problem can be dual flue gas conditioning (FGC) – using the combination of SO3 and NH3.

This paper describes the implementation of a dual FGD system as the solution to an ESP performance problem caused by high UBC levels from three large anthracite fired boilers.  In this case operation with high levels of unburned carbon caused the resulting cohesive forces of the collected particulate matter to decrease and the re-entrainment to increase, herby causing the emission to increase.

The existing boiler and ESP installation and the ESP performance problems encountered during operation with high UBC levels in the FA are described.  The operation of the precipitator installation, the flue gas data and the resulting emission characteristics is investigated.

The existing boiler and ESP installation and the ESP performance problems encountered during operation with high UBC levels in the FA are described.  The operation of the precipitator installation, the flue gas data and the resulting emission characteristics is investigated.

Further the elements of the new dual FGC system is described as well as the operating experience.  The positive effect of dual injection is dramatic.  Within a few minutes the emission drops very significantly and the height of the rapp9ing spikes reduced.

Finally the environmental effects are described concluding that, monitoring for ammonia slip in the flue gas and ammonia release from the ash handling system and storage area revealed no environmental or operational impact to preclude continued use of ammonia conditioning.

The enhanced precipitator refurbishment package has now been installed on all the Aberthaw units, all of which have passed their contractual performance tests.  

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