Positive pulsed corona discharge process for simultaneous removal of SO/sub 2/ and NO/sub x/ from iron-ore sintering flue gas

We 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 iron-ore sintering plant. The 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 as that of the conventional electrostatic precipitator. We made use of magnetic pulse compression technology to produce repetitive high voltage pulses. The pulse width (full width at half maximum) was reduced to less than 1 /spl mu/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 method, we 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/.

[1]  W. C. Finney,et al.  Combined removal of SO/sub 2/, NO/sub x/, and fly ash from simulated flue gas using pulsed streamer corona , 1989 .

[2]  Tetsuji Oda,et al.  Nitric oxide decomposition in air by using nonthermal plasma processing-with additives and catalyst , 1996 .

[3]  R. A. Cox,et al.  Evaluated kinetic and photochemical data for atmospheric chemistry: Supplement V , 1996 .

[4]  R. A. Cox,et al.  Evaluated kinetic and photochemical data for atmospheric chemistry: Volume III - gas phase reactions of inorganic halogens , 2006 .

[5]  Roger Atkinson,et al.  Evaluated kinetic and photochemical data for atmospheric chemistry: Volume III - gas phase reactions of inorganic halogens , 2006 .

[6]  C. Deeney,et al.  Flue gas irradiation using pulsed corona and pulsed electron beam technology , 1993, Ninth IEEE International Pulsed Power Conference.

[7]  L. Civitano.  Industrial Application of Pulsed Corona Processing to Flue Gas , 1993 .

[8]  Kawamura Keita,et al.  Pilot plant experience in electron-beam treatment of iron-ore sintering flue gas and its application to coal boiler flue gas cleanup , 1984 .

[9]  Y. Mok,et al.  Evaluation of Energy Utilization Efficiencies for SO2 and NO Removal by Pulsed Corona Discharge Process , 1998 .

[10]  G. Dinelli,et al.  Industrial experiments on pulse corona simultaneous removal of NO/sub x/ and SO/sub 2/ from flue gas , 1988 .

[11]  Shinji Katsura,et al.  Pulsed plasma treatment of polluted gas using wet/low temperature corona reactors , 1995 .

[12]  J. Lowke,et al.  Theoretical analysis of removal of oxides of sulphur and nitrogen in pulsed operation of electrostatic precipitators , 1995 .

[13]  N. Suzuki,et al.  Enhancement of removal of SO2 and NOx by powdery materials in radiation treatment of exhaust gases , 1985 .

[14]  S. Masuda.  Report on Novel Dry DeNOx/DeSOx Technology for Cleaning Combustion Gases from Utility Thermal Power Plant Boilers , 1993 .