Low-temperature SNCR technology for controlling NOx emission

Moo Been Chang, Ching Fong Cheng, Chun Po Huang

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

Abstract

An innovative technology for removing NOx through the generation of amidogen (NH2) and imidogen (NH) free radicals via dielectric barrier discharges (DBD) was demonstrated in this study. A laboratory-scale experimental system was designed and constructed to evaluate the effectiveness of removing NOx from simulated flue gas at temperatures much lower than traditional SNCR process. Dielectric barrier discharges (DBD) coupled with NH3 injection was applied to generate NH and NH2 radicals which could reduce NOx molecules to form N2 and H2O. Dependence of NO removal efficiency on relevant operating parameters including applied voltage, inlet gas composition, inlet gas temperature and power input were also determined. Experimental results indicated that the NOx reduction efficiency was limited by the concentration of NHi radicals. Experimental results also showed that as high as 60% of NOx was removed by NHi radicals generated with DBD process at room temperature. The influence of oxygen content in the gas stream on NO reduction was not significant, reflecting the characteristics of selective reduction of NO in this process. At lower applied voltages (<17 kV), increasing temperature enhanced the effectiveness for NO removal. On the other hand, the temperature effect was not significant at higher applied voltages (>17 kV). In addition, the spectrums of Fourier transform infrared spectroscopy confirmed that the byproducts detected during reduction process included N2, H2O and trace of N2O. These results indicate that the conventional SNCR process can be operated at temperatures around 100 with the aid of DBD technology.

Original languageEnglish
Title of host publicationProceedings of the Air & Waste Management Association's Annual Meeting & Exhibition
Editors Anon
PublisherAir & Waste Management Assoc
StatePublished - 1997
EventProceedings of the 1997 Air & Waste Management Association's 90th Annual Meeting & Exhibition - Toronto, Can
Duration: 8 Jun 199713 Jun 1997

Publication series

NameProceedings of the Air & Waste Management Association's Annual Meeting & Exhibition

Conference

ConferenceProceedings of the 1997 Air & Waste Management Association's 90th Annual Meeting & Exhibition
CityToronto, Can
Period8/06/9713/06/97

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