PLASMA-ASSISTED REMOVAL OF NO FROM GAS STREAMS VIA AMMONIA INJECTION

Removal of nitric oxide (NO) from gas streams via combined NH3 injecti on with dielectric barrier discharge (DBD) plasmas was experimentally investigated. Removal of NO was principally achieved via its reaction with NHi radicals generated with DBD plasmas. Removal efficiency of NO was measured as a function of stoichiometric ratio, applied voltage, and inlet NO concentration of the gas stream. Experimental results sho wed that as much as 80% of NO was removed from gas streams operating a t room temperature. Increase in NH3/NO molar ratio and applied voltage enhances NO removal efficiency. NO removal efficiency decreases sligh tly as oxygen content in the gas stream increases from 0% to 6%, indic ating the characteristic of selective reduction in this process. Howev er, 15 ppmv N2O was detected with Fourier transform infrared for gas s treams containing 6% by volume O-2 and 300 ppmv NO. Results of this st udy indicated that conventional SNCR process could be operated at a mu ch lower temperature by applying plasma technology to generate NHi rad icals.