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