|Title:||Gas-phase Removal of SO2 and NO with Dielectric Barrier Discharges||Other Titles:||以介電質放電法去除502及NO之可行性研究||Authors:||Moo Been Chang
|Keywords:||Gas-phase oxidation;SO2 removal;NO removal;dielectric barrier discharges;氣態氧化;二氧化硫去除;氮氧化物去除;介電質放電||Issue Date:||Apr-1993||Publisher:||農業試驗所||Start page/Pages:||36-48||Conference:||臺灣地區空氣污染與農業氣象對作物生產影響研討會專輯||Abstract:||
Concern over acid deposition has reulted in more stringent SO2 and NO emission standards as designated by the 1990 Clean Air Act Amendments. In view of the more stringent emission standards and the constraints of current air pollution control technology for removing SO2 and NO from gas streams, more effective air pollution control technologies should be searched. An innovative gas phase oxidation method using dielectric barrier discharges (DBDs ) has been developed to simultaneously remove SO2 and NO from gas streams. This process generates gas phase radicals such as OH, 1102, and 0. The radicals can then oxidize gaseous SO2 and NO to form particles consisting of I-12S04 and 11N03, respectively. The resulting compounds can then be chemically neutralized with NH3 and removed from the gas stream by othe conventional air pollution control devices. The effectiveness of DBDs to remove SO2 and NO from gas streams has been evaluated with a laboratory- scale reactor. Experimental results showed that about 35 % of SO2 can be removed from the gas stream at 160 ℃ with DBDs. This removal efficiency was achieved for a gas stream with an inlet SO2 concentration of 1000 ppmv, H20 concentration of 15 % by volume, CO2 concentration of 12 % by volume, O2 concentration of 6 % by volume with N2 as the carrier gas. The gas residence time is 5 sec and processing voltage is 25 kv (peak value). 99 % removal efficiency for NO was also achieved for the gas stream with an inlet NO concentration of 250 ppmv at the same operating conditions described above. These results indicated that DBDs have the potential to simultaneously remove SO2 and NO from gas streams generated by large scale sources of SO2 and NO, such as a coal-fired power plant.
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