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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-2 Series papers from the VII ICESP Conference.  

PP06 DeNOx Pilot Scale Experiment with Exhaust From Stainless Steel Production Plant 
Jae O. Chae, Boub G. Kim, Kwon Y. Kim, Jin So
Combustion Labrartory Mechanical Department
Yuriy N. Dessiaterik and Ravil H. Amirov
Plasma Division
Institute for High temperature, Russian Acadamey of Sciences

DeNOx system based on the pulse corona discharge has been used for treatment of exhaust gas from stainless steel production plant in pilot scale experiment.  The difference of the experiments from other pilot systems is that the stainless steel plant exhaust gas mainly consists of air with 100% relative humidity and relatively low temperature around 40OC.  The thyratron was used as a switching element in pulse generator.  It allows increasing operation frequency op to 1500 Hx.

Gas flow rate was up to 1000 m3/h and total power was up to 10 kW (maximum energy density inputted in to gas was). Voltage amplitude was up to 110 kV and miximum current was up to 600 A.  Pulse energy was 22 J and peak power 50 MW.  Reactor was wire-tube type with wire diameter 2 mm and tube diameter 20 cm.  The reactor consists of 18 tubes connected in parallel.  The length of each tube was 1 m.

Initial NOx concentration was 100 1500 ppm.  Maximum of removal efficiency was 88% and maximum power density injected to the gas was 60 Wh/m3.

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PP07 Non-thermal Plasma Processing for De-NOX/SOX
Hyun Ha Kim, ChunXi Wu, Shinji Katsura, Akira Mizuno
Dept. of Ecological Engineering

The effects of various parameters, such as initial concentration, temperature, additive and coexistence of Sox and NO removal performance were evaluated using k value from a simple model.  This semi-empirical model incorporates various parameters known to affect NO removal.  For the removal of NO, exponential relationship between decrease in NO concentration and specific input power (J/L) has been observed.  The method we present here can provide some useful information on designing non-thermal plasma reactors.  For a specified condition, the required energy consumption to achieve desired removal rate is mostly determined by the initial concentration and the temperature.  When SO2 was present in the gas stream, NO removal was greatly increased.  SO2 was efficiently removed by thermal reaction with H2O2 and SO2 removal rate showed little dependence on the discharge plasma at the conditions tested in this work.  As for additive, hydrogen peroxide (H2O2) gives more promising result than C2H4 for simultaneous treatment of NOx and SOx.  Energy efficiency, by=product identification, comparative assessment of various additives will be discussed.

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PP08 SUENTP Code Simulations of Scaleup and Economic Evaluation of Non-Thermal Plasma Technology for Exhaust Gas Emission Control of Coal Fired Power Plants
Seock Joon Kim and Jen-Shih Chang
Department of Engineering Physics

Computer code (SUENTP) to predict scaleup and economic evaluation of several eligible non-thermal plasma processes for air pollution controls-electron beam process, pulsed corona process, and corona radical shower process was developed for a commercialized power plant.  This code was written by spread sheet type MS excel with visual basic for application and comprise data input procedure, scale-up (design) procedure, economic calculation procedure, and output procedure.  Data obtained from pilot plant tests are input with general data so they might be led to the conceptual design data of commercial plants by scale-up procedure.  In the next economic evaluation procedure, the total capital investment and the total annual cost.  The total capital investment comes into the indirect annual cost as the item of capital recovery.  The levelized cost and the levelized busbar cost could be shown in the output table.  An example calculation was presented to evaluate the cost of three non-thermal systems and the results were compared with a conventional wet-scrubber/selective catalytic reduction combined system.

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PP09 Oxidation and Reduction Processes during NOX Removal in N2 + O2 with Corona Induced Non-thermal Plasma
Keping Yan, Seiji Kanazawa, Toshikazu Ohkubo and Yukiharu Nomoto
Oita University

In this paper, the NO to NO2 conversion in simplified gaseous compositions of N2+NO and N2+O2+NO are experimentally investigated.  Streamer corona is produced with a DC superimposed high frequency AC power supply.  Experiments in NO2+NOx and NO2+O2+NOx gaseous mixtures suggest that the reverse reaction NO2+O→NO+O2 may not only limit NO2 production in N2+NOx mixture, but also increase the energy cost for NO removal in N2+O2+NOx mixture.  Oxygen could significantly suppress the reduction processes and enhance the oxidation processes.  The reduction reaction, such as N+NO→N2 +O, induce negligible NO removal provided O2 concentration is larger than 3.6%.

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PP10 Performance of PPCP System
Umeo Inoue, Sadaji Obata, Hiroyuki Kishida

For several years, we have been working on applications of cold plasma (PPCP System) to the removal of dioxins and NOx.  The main purpose of this study is concerning the removal of dioxins and has been performed by the two-stage system which comprises the dust-collector and PPCP.

In the research using the pilot plant with a gas volume of 5000Nm3/h, the dioxins contained in the dust (particulate dioxins) is collected in the first stage and gaseous dioxins are removed in the second stage.  The final dioxins concentration in the flue gas is 0.1ng-TEQ/Nm3 or less.

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