Characteristics of Particulate Formation for Removal of SO2 from Flue Gases by Corona Discharge Radical Shower Non-Thermal Plasma Systems

[[abstract]]The corona discharge radical injection system for treatment of NO x and SO2 has been investigated and demonstrated to improve significantly removal efficiency, energy efficiency, by-products yield etc. In the corona discharge radical injection technique, corona discharge is generated in front of a hollow electrode where ammonia, hydrocarbon, steam, oxygen, nitrogen, etc., were injected, Therefore, we can select radicals required for pollution gas treatments and minimize activations of unwanted flue gas components [1]. One of the mechanism of the corona radical shower system is that adiabatic expansion of NHs contained gas to form core aerosol particles from homogeneous condensation from nozzle exits. Aerosol surface reaction rates are a few orders of magnitude higher than that of the gas phase reaction rates. The other mechanism of NOx and SO2 removal is formation of N (P), N (D), H, N2*, NH and NH2 radicals at the exit of nozzle electrode where strong electric field and high density plasma exist for promote oxidation and reduction reactions. In this work, the mechanism of NOx and SO2 convertion to aerosol particles at downstream of reactors, reacting with slip NH3, and core aerosol particles generated by homogeneous condensation and ion induced aerosol formations will be investigated in detail [2]. Experiments were conducted for the flue gas rate from 3 to 12 Nm3/h, the NH3 to acid gas molecule ratio from 0.5 to 1.5, applied voltage from 0 to 27 kV and SO 2 initial concentration from 500 to 1000 ppm. The results show that SO2 removal efficiency increases with increasing ammonia radical injection rate and in-put electrical power. We observed slip NH3 increases with increasing mole ratio and decreases with increasing applied voltage. However, SO2 removal efficiency decreases with increasing mole ratio without discharge. Also, results show that the formation of aerosol particles as well as the particle size distribution depends on applied voltage and initial concentration of SO2.[[fileno]]2030213030051[[department]]資訊工程學