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
Abstract
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
Abstract
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
Abstract
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
Abstract
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
TAKUMA Co. Ltd.
Abstract
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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