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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 EC-2 Series papers from the VII ICESP Conference.  

EC06  Improving Efficiency of ESP with the Magnitude-regulated and Phase-Shifting Power Supply
Wang Weixue
Jiang Yahin
Yang Tahong
Wang Qiang
Zhu Xiaohua
Wang Zhenyu
Nanjing Power Environmental Protection Research Institute
National Electric Power Corporation

Being directed against the problems with ESPs power supply that only magnitude-regulated or phase shifting is adopted.  A new type of power type of power supply integrating magnitude-regulated with phase-shifting was developed.  A small-scale industrial experiment had proved that it can improve the efficiency of ESP remarkably.

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EC07  ESP Efficiency Measurements with a Flexible Pulsed Power Supply Pradip V. Gurnani & Aditya Dhingra
Norbert Klippel, Stefan Stutz, and Ulrich Kogelschatz
ABB Corporate Research

Optimization of the collecting efficiency during pulsed energization has been performed in a well instrumented laboratory electrostatic precipitator (ESP) with high resistivity fly ash.  Peak and base voltage, pulse length and repetition rate, as well as pulse rise and decay time can be adjusted independently to indentify optimum voltage shapes.  The length of the high voltage peak above corona onset can be set as short as 10s.  this time is considerably shorter than the transit time for the motion of the ions to the collecting plates.  Consequently, an ion flux is still present when the voltage is switched back to a value below corona onset.  This effect could be clearly detected by corona current monitors.  The current monitors, which are installed at each individual collecting plate, were also used for the detection of back corona onset.  In order to identify best parameter settings for various operating conditions in the field, the ESP efficiency as a function of particle size has been measured with optical particle counters.  The effect of optimized setting of the high voltage on ESP performance is discussed.

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EC08  Pulse Energization Solving Sinter Strand ESP Problems Chen, Yuyuan
Peter Elholm, Carsten R. Lund, Kurt Christensen

A large number of the worlds sinter stand waste gas ESPs operates under severe Back Corona (BC) conditions.  Especially outlet fields, collecting the finer fractions of the dust, have been found to be experiencing BC.  The requirement for wash down of the ESP and subsequent significantly decreasing performance with time is commonly know.  FLS miljo has during the later years supplied COROMAX Pulse Systems to a number of sinter strand ESPs solving the above mentioned problems, resulting in a substantially lower and more stable emission.

Based on the experience gained and the results obtained in e.g. Korea and several countries in Europe this paper initially describes the results obtained with different types of ESP energization.

Through a brief description of the process and the results from different European plants, the main difficulties in cleaning waste gases are identified.  Different possibilities solving the above problems are described, claiming that the pulse energization is the superior ESP solution.  Performance data from before and after the implementation of pulse energization will be presented.

Through in situ particle size measurements on inlet and outlet dust as well as chemical analysis of the size fractions, the known negative effect on the performance of ESPs from an increased degree of dust re-circulation is explained.  ESP performance with different degrees of dust re-circulation are reported and discussed in relation to the corresponding particle size distributions.

To operate properly and to yield a significantly emission reduction when Pulse Energization is applied, the mechanical condition of the ESP has to be acceptable.  The effect of alignment problems is quantified and the influence of sneakage and gas distribution in general is discussed.

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EC09  Development and Application of the LYC3-IV Type Multi-purpose Control Simulating Testing Unit for ESP
Youjin Xie
Engineering Department
Jame Lee
Market Department
Liqian Wang
Electric Power Environmental Precipitation
Research Institute of Nanjing

According to the lack of the special tool for testing the high-voltage control cabinet for ESP on site ate present, I will introduce one kind of multi-purpose control simulating testing unit with a dynamic spark generator.  It can be widely used in test for producing the high voltage control cabinet, maintenance, developing, training, etc.

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EC10  Development on Simulating Software of High Voltage Energization System For Electrostatic Precipitator
Hezhong Tian and Zhiguang Hu and Guanping Yang
Xianglin Gao and Manyin Hu
Department of Environmental Engineering
North China Electric Power

According to characteristics of principle training simulator for electrostatic precipitator (ESP) and its relevant mathematical models that had been constructed, which mainly included models of high voltage energization system of ESP with intermittent energization and spark tracing energization, the simulating software of high voltage system of ESP was developed with C language.  It could emulate system start-up, run, shut-down, normal adjustment, parameters display, faults installation and removal, etc.  The simulating results were closely coincided with the reality in power plants in China .

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