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Title: Effect of water on sulfur dioxide (SO{sub 2}) and nitrogen oxides (NO{sub x}) removal from flue gas in a direct current corona discharge reactor

Abstract

A direct current (dc) corona discharge reactor composed of needle-plate electrodes in a glass container filled with flue gas was designed. To clarify the influence of water on discharge characteristics, water was introduced in the plasma reactor as electrode where plate electrode is immersed, under the application of dc voltage. Experiment results show that (1) corona wind forming between high-voltage needle electrode and water by corona discharge enhances the cleaning efficiency of flue gas due to the existence of water and the cleaning efficiency will increase with the increase of applied dc voltage within definite range and (2) both removal efficiencies of NO{sub x} and SO{sub 2} increased in the presence of water, which reach up to 98% for SO{sub 2}, and about 85% for NO{sub x} under suitable conditions. These results play an important role in flue gas cleanup research.

Authors:
; ;  [1]
  1. Harbin University of Science and Technology, Harbin, 150040 (China)
Publication Date:
OSTI Identifier:
20982878
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 101; Journal Issue: 10; Other Information: DOI: 10.1063/1.2733762; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CORONA DISCHARGES; DIRECT CURRENT; ELECTRIC POTENTIAL; ELECTRODES; FLUE GAS; NITROGEN OXIDES; PLASMA; SULFUR DIOXIDE; WATER

Citation Formats

Yang, Jiaxiang, Chi, Xiaochun, and Dong, Limin. Effect of water on sulfur dioxide (SO{sub 2}) and nitrogen oxides (NO{sub x}) removal from flue gas in a direct current corona discharge reactor. United States: N. p., 2007. Web. doi:10.1063/1.2733762.
Yang, Jiaxiang, Chi, Xiaochun, & Dong, Limin. Effect of water on sulfur dioxide (SO{sub 2}) and nitrogen oxides (NO{sub x}) removal from flue gas in a direct current corona discharge reactor. United States. doi:10.1063/1.2733762.
Yang, Jiaxiang, Chi, Xiaochun, and Dong, Limin. Tue . "Effect of water on sulfur dioxide (SO{sub 2}) and nitrogen oxides (NO{sub x}) removal from flue gas in a direct current corona discharge reactor". United States. doi:10.1063/1.2733762.
@article{osti_20982878,
title = {Effect of water on sulfur dioxide (SO{sub 2}) and nitrogen oxides (NO{sub x}) removal from flue gas in a direct current corona discharge reactor},
author = {Yang, Jiaxiang and Chi, Xiaochun and Dong, Limin},
abstractNote = {A direct current (dc) corona discharge reactor composed of needle-plate electrodes in a glass container filled with flue gas was designed. To clarify the influence of water on discharge characteristics, water was introduced in the plasma reactor as electrode where plate electrode is immersed, under the application of dc voltage. Experiment results show that (1) corona wind forming between high-voltage needle electrode and water by corona discharge enhances the cleaning efficiency of flue gas due to the existence of water and the cleaning efficiency will increase with the increase of applied dc voltage within definite range and (2) both removal efficiencies of NO{sub x} and SO{sub 2} increased in the presence of water, which reach up to 98% for SO{sub 2}, and about 85% for NO{sub x} under suitable conditions. These results play an important role in flue gas cleanup research.},
doi = {10.1063/1.2733762},
journal = {Journal of Applied Physics},
number = 10,
volume = 101,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}
  • The authors investigated the application of pulsed corona discharge process to the removal of SO{sub 2} and NO{sub x} from industrial flue gas of an ioron-ore sintering plant. This study was performed on a pilot scale, which is the most advanced demonstration of this process. The flow rate of 5000 m{sup 3}/h of the flue gas was successfully treated. The electrode structure of the corona reactor is the same with that of conventional electrostatic precipitator. The authors made use of magnetic pulse compression technology to produce repetitive high voltage pulse. Pulse width (full width at half maximum) was reduced tomore » less than 1 {micro}s by connecting a resister in parallel with the corona reactor. An inductor was added to the resister in series to minimize the loss by restricting the current flowing through the resister. By this way, they were able to deliver pulse power with peak voltage of 110 kV and peak current of 2.3 kA to the corona reactor. Chemical additives such as ammonia (NH{sub 3}) and propylene (C{sub 3}H{sub 6}) were used to increase the removal efficiencies of SO{sub 2} and NO{sub x}.« less
  • A pulse-energized electron reactor which utilizes pulsed streamer corona has been developed for the combined removal of SO/sub 2/, NO/sub x/, and particles from effluent gases. In the pulse-energized electron reactor process, fast-rising narrow high-voltage pulses are superimposed on a dc-bias voltage and applied to a nonuniform electric field geometry to generate pulsed streamer corona. The pulsed streamer corona produces energetic free electrons, which dissociate gas molecules, forming radicals. These radicals cause chemical reactions that convert SO/sub 2/ and NO/sub x/ into acid mists and/or solids, which can be removed from the gas stream by conventional means. The pulsed streamermore » corona also produces ions, and between pulses the ions charge the fly-ash particles, which are then collected by the dc-bias field. In pulse-energized electron reactor performance tests on a humid air stream with an initial SO/sub 2/ concentration of 1000 ppm, more than 90 percent of the SO/sub 2/ was removed with an advantageously small power requirement. Combined treatment performance was demonstrated by introducing high-resistivity fly-ash into the gas stream. The fly-ash collection efficiency of the pulse-energized electron reactor was significantly better than that of a conventional dc wire-cylinder electrostatic precipitator when the electrodes of both were covered with a high-resistivity layer.« less
  • The corona-induced simultaneous removal of NO{sub {ital x}} and SO{sub 2} from the flue gas is based on the application of narrow voltage pulses to an electrode structure similar to that of an electrostatic precipitator. The free electrons of the corona discharge, having energy up to 20 eV, originate active radicals which lead to the transformation of NO{sub {ital x}} and SO{sub 2} into their acids which can be neutralized to salt particulate by adding to the gas a basic compound such as ammonia and calcium hydroxide. The process has been investigated with a test rig installed in the slipstreammore » of the flue gas duct of a coal thermal power plant. The experiments were performed with three reactor modules of different geometries having a nominal gas flow rate of 1000 Nm{sup 3}/h. The voltage pulses, generated with a fast switching experimental device, had a rise front of less than 400 ns and a repetition frequency up to 300 Hz. The test results have confirmed the physical feasibility of the process.« less