NO{sub x} removal process using pulsed discharge plasma

Journal Article · Fri Sep 01 04:00:00 EDT 1995 · IEEE Transactions on Industry Applications

DOI:https://doi.org/10.1109/28.464504· OSTI ID:131569

Mizuno, Akira; Shimizu, Kazuo; Chakrabarti, A; Dascalescu, L; Furuta, Satoshi ^[1]

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1. Toyohashi Univ. of Technology (Japan)

Nonequilibrium plasma can be used to promote chemical reactions that reduce the emission of gaseous pollutants, such as NO{sub x}, produced by coal-burning power plants or by diesel engines. Laboratory experiments were carried out to study the decrease of NO{sub x} in simulated flue gases (initial concentration of NO: 200--800 ppm, O{sub 2}: 10%, N{sub 2}--balance gas) by means of a pulsed discharge plasma generated in a cylinder type reactor (outer electrode: 20-mm diameter). A rotating spark gap provided square wave high-voltages up to 25-kV, at a frequency of 250 Hz, to corona electrodes of 0.1-, 3.3-, and 6.4-mm diameter. The tests were performed at various temperatures (ambient to 200 C) and constant residence time (0.6 s). The removal performance depended on the size of the discharge electrode and was better at room temperature. The addition of C{sub 2}H{sub 4} significantly enhanced the removal performance, concentration of NO{sub x} decreased from 800 ppm to 300 ppm in the discharge. The by-products of this process were analyzed using infrared spectroscopy. No traces of toxic gases could be detected.

• OSTI ID: 131569
• Journal Information: IEEE Transactions on Industry Applications, Journal Name: IEEE Transactions on Industry Applications Journal Issue: 5 Vol. 31; ISSN 0093-9994; ISSN ITIACR
• Country of Publication: United States
• Language: English

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