Gas cleaning with semi-wet type plasma reactor

An experimental study on the removal of NH/sub 3/, NO, NO/sub x/ in concentration of 10-40 ppm in air has been carried out using plasma chemical reactions in a streamer corona discharge. The results of the performance of dry type and semi-wet type reactors are compared. The effects of different type of applied voltages such as rectangular pulse, 60-Hz sinusoidal, and 18-kHz alternating voltages are investigated. During NO removal, O/sub 3/ and NO/sub 2/ are produced. NO/sub 2/ can, partially, be removed with higher power input into the discharge. Another undesirable pollutant, namely N/sub 2/O, is also produced, especially, in case of dry reactors having long residence time (/spl sim/2.4 s). N/sub 2/O production decreases, essentially, to zero at 0.6-s residence time while using a semi-wet reactor. In general, higher removal efficiency has been obtained with pulse voltage in a semi-wet reactor. NH/sub 3/ in air appears to produce ozone and ammonium nitrate in a discharge. The performance of semi-wet reactors an the removal of submicron dust particles has also been investigated and very high removal efficiency (/spl sim/93% at 0.6-s residence time) has been obtained.<
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