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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 PP-1 Series papers from the VII ICESP Conference.  

PP1 Optimization of Pulsed Corona Discharge for Flue Gas Treatment
Zhu Yimin, Wang Ninghui
Institute of Electrostatic Research & Specific Power

In this work the pulsed corona discharge for flue gas treatment has been studied experimentally, and the optimization of these plasma characteristics has been discussed.  Firstly, some important relations between the plasma characteristics and SO2 removal have been obtained by regulating the generator and the reactor operation conditions.  According to the experimental study, some important evidence of the optimum plasma characteristics has been concluded.  In order to reach the optimization, it is suggested that the pulse should have short rise time, high peak value, narrow pulse width, and small oscillation on its tail.  Eventually, the matching between the generator and the reactor has been obtained successfully.  To some degree, the work makes the plasma characteristics close to an optimum stage.

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PP02  Investigation on SO2 and NOX Removal from Flue Gas by Pulsed Corona Discharge
Wu Yan, Zhu Yimin, Wang Nighui
Dalian University of Technology

This paper has summarized the main results of pulsed corona discharge obtained by the institute since 1990.  Four important research aspects have been conducted, namely, pulsed corona discharge, reaction mechanism, fundamental experiments and industrial experiments.  All advantages compared with traditional sulfur removal technologies.

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PP03 Effects of Chemical Additives on Pulse Corona Process to Treat Combustion Flue Gases
Tang Minkang and Chen Guofang
Department of Construction Engineeering Southern Institute of Metallurgy

Performance of NO removal process in a pulse corona process has been experimentally investigated under various operating conditions, e.g., different gas compositions, temperature, and locations of injected hydrocarbons.  The present study showed that chemical reaction paths of NO removal process are significantly different depending on the operating conditions.  Under low temperature and dry conditions, O3, however, is significantly reduced under practical conditions of combustion flue gas, which has hot and humid conditions.  The present study also showed that effects of hydrocarbon injection on NO removal process were varied depending on the locations of hydrocarbon injections, i.e., inlet and outlet of a corona reactor.  Detailed analysis shows that such discrepancies are caused by the life times of active chemicals, such as O, OH, HO2, and O3.

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PP04 Removal of the Aerosol Particles Formed in PPCP and EBDS by a Novel ESP
Xu Dexuan, Liu Zhongyang and Wu Guojun
Institute of Electronics research, Department of Physics

The aerosol particles with similar properties were formed in DeSO2 and DeNox from flue gas by PPCP (Pulse Corona Induced Plasma Chemical Process) and EBDS (Electron Beam Dry Scrubbing Process).  The particles are difficult to be removed by traditional electrostatic precipitators and filters.  In this paper, the novel technology of electrostatic precipitator with discharge electrodes ejecting supersaturation steam was introduced.  The experiments with wide duct spacing have demonstrated that the stable and effective dry electrostatic removal was realized by using s small amount of available supersaturation steam and the convenient high voltage insulation. It is promising to remove partly the SO2, NOx and NH3 remained after desulfuration section.  Moreover, the novel technology is suitable for removing many kinds of special dusts to avoid or reduce corona quench, fouling of corona wire, back corona of high resistivity, discharge electrode failure, reentrainment and so on.

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PP05 Investigation of NOX, SO2 Oxidation and CO Formation in Flue Gas by Nanosecond Streamer Corona
Ravil H. Amirov, Eric I. Asinovsky, Igor S. Samoilov
Institute for High Temperatures
Russian Academy of Sciences
Alexandr M. Zykov, Konstantain I. Kolchin
All-Russian Thermal Engineering

The SO2 removal efficiency of the corona reactor was measured both with and without the presence of fly-ash particles in the gas stream.  The gas conditions were gas flow rate 20-140 Nm3/h, gas temperature of 35-150O C, SO2 initial concentration of 130-1550 ppm, O2 concentration of 18,9-20,4%, H2O of 6-240 g/m3.  The reactor chamber was a rectangular box.  The wire corona electrode had a diameter 1 mm and a full length 4-6m.

The minimum energy cost for SO2 removal was 12 ppm/(Wh/Nm3).  It is found that the addition of some sort of fly ash to the gas stream increases the corona SO2 removal efficiency. The neutralization efficiency of different fly ash has been analyzed.

The effect of streamer corona discharge on the NOx and CO concentration in a methane combustion flue gas has been studied.  The experiments were performed with wire-cylinder reactor module having a nominal flue gas flow rate up to 33 Nm3/h.

Gas phase chemical kinetic model for NOx oxidation in homogeneous flow of combustion products has been used for simulation (Amirov, 1998).  Calculations of the chemical processes were performed by computer code Radical 4.3 Mechanisms of influence of various active particles on DeNOx and CO formation processes and role of various reactions in the evolution of gas composition were analyzed. The good agreement between the experimental data and calculations was achieved.

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