Simultaneous So_x and No_x Removal Using Plasma-Chemical Hybrid Process from Power Plant

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The objective of this study was to develop a cost effective simultaneous removal of NO_x and SO_x using the nonthermal plasma-chemical hybrid process. A series of experiments were performed to evaluate the simultaneous NO_x and SO_x removal efficiency and to quantify all the reaction byproducts such as N_2O, CO, HNO_2 HNO_3NO_3 and SO_4 using FTIR and ion chromatograph which was purchased for this project. The oxidation from NO to NO_2 without decreasing NO_x concentration(i.e., minimum reaction byproducts)and with least power consumption is the key for the optimum reactor operating condition. The produced NO_2 was totally converted to N_2 and Na_2SO_4 with Na_2SO_3 with and without NaOH using the barrier-type packed-bed and the pulsed corona plasma reactor followed by the chemical reactor. The total operating cost of the hybrid process becomes $1,156〜1,1726/ton of NO at 20℃ and $1,173〜1,753/ton at 130 ℃ to achieve 100% NO_x removal with less than 5 ppm of N_2O and CO, which is less than 10 times economical than the conventional selective catalytic reduction(SCR) process. This hybrid system was also investigated using the slip stream from the incineration plant. More than 95% of NO_x removal was achieved under normal conditions(less than 15% of moisture content). When the moisture content was in the range of 30 and 40%, NO_x removal efficiency was reduced to 80%. However, the operating cost was only 1/7 of the SCR process.