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Reduction of NOx from combustion flue gases by superimposed barrier discharge plasma reactors

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3 Author(s)
Urashima, K. ; Dept. of Eng. Phys., McMaster Univ., Hamilton, Ont., Canada ; Chang, Jen‐Shih ; Ito, T.

NOx reduction from combustion flue gases by superimposed barrier discharge plasma reactors is experimentally investigated. The experiments are conducted for applied voltages from 0 to 28 kV, flue gas rates from 0.5 to 2 L/min, ammonia mixture concentrations from 0.7 to 2.65 stoichiometry, and applied voltage phase differences from 0° to 180°, where two 60-Hz AC power supplies are used. The results show the following: (1) NOx reduction rate decreases with increasing discharge power for surface discharge operations, however, NOx reduction rate increases with increasing discharge power for silent and superimposing discharge operating modes; (2) NOx reduction rate increases with increasing discharge power, gas flow rate and ammonia stoichiometry under in-phase operations; (3) NOx reduction rate for out-of-phase operations is much higher compared with in-phase operations, however, NOx reduction rate has an optimum condition on ammonia stoichiometry, discharge power, and gas flow rate; and (4) energy efficiency of NOx reduction increases with increasing ammonia mixture and gas flow rate and decreases with increasing discharge power

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Industry Applications, IEEE Transactions on  (Volume:33 ,  Issue: 4 )