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ICESP X CONFERENCE PAPER ABSTRACTS 8A SERIES

Held in Cairns, Australia
June 25 - 29, 2006

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 8A Series papers from the X ICESP Conference.  

8A1
PERFORMANCE IMPROVEMENT OF ELECTROSTATIC
PRECIPITATOR: SOME EXPERIMENTAL STUDIES
A. CHANDRA

Abstract

Emissions standards are becoming more stringer, as a result new retrofit/technique are being applied in the existing power plant in India. Electrostatic Precipitators (ESP) are used to control fly ash emitting from the boilers of the power plants. The coal burned in power plants in India to generate the power are characterized by low calorific value (3500-4500) Kcal/Kg., and high ash content (35-45) %. Thus compared to U.S. and European coals, Indian coal generate about 6 to 7 times more ash for collection for similar electricity generation. Besides, low sulfur content (<0.5), results in the resistivity of fly ash being 100-1000 times higher than that generated elsewhere. Thus ESPs in India, despite being much larger, have lower collection efficiencies than the ESPs in U.S/Europe. In this paper we discuss some methods which are being applied in different power plants in India to improve the collection efficiencies of ESP.

The methods, which have met with success, are (a) Pulse charging of ESP unit, (b) Flue gas conditioning by water fogging and ammonia, and (c) coal ash conditioning with sodium salt before feeding to boiler. In some case additional ESP was put in series with the existing one thereby, increasing the total collection area. The paper describes the experiments and analyses the results obtained.


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8A2 
UPGRADE TECHNOLOGIES FOR ELECTROSTATIC
PRECIPITATORS
LENA LILLIEBLAD AND CHRISTER MAURITZSON

Abstract

Electrostatic precipitators (ESP's) are commonly used for collection of particles in power plants and industrial applications. There are many ESP's around the world not meeting today's requirements due to aging, process changes and more stringent regulations for emission limits. Before ESP performance improvements can be considered, measures must be taken to ensure that the equipment is mechanically sound. Once this is accomplished there are various upgrade technologies available to improve the ESP performance. In order to choose the most appropriate upgrading technology it is necessary to have a good knowledge about the site-specific conditions.

Measures can be taken to:

Avoid or reduce the effect of high resistivity dust
Reduce re-entrainment of dust caused by rapping or high gas velocity
Change the mechanical ESP design by replacing internals and/ or rapping system
Upgrade the ESP energy supply and control systems
Optimize gas distribution and reduce sneakage
Increase the ESP size
Change the particle size distribution with agglomeration technologies

In this paper different upgrading techniques are described and compared both from a technical and economical point of view. A modern ESP control system is often a cost-effective method with a significant potential to reduce both emissions and power consumption especially at high resistivity dust conditions.

Exchange of old transformer/ rectifiers (T/R's) to high-frequency power converters have been successful in reducing the effect of corona quenching and allowing a higher T/R power input when severe space charge conditions prevails at high dust loads. Significant reductions in emissions have been observed.


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