Research Progress of Plasma Technology in Treating NO, SO₂ and Hg⁰ from Flue Gas

Abstract

With the rapid development in industrialization and urbanization, various air pollutants are emitted into atmospheric environment. NO, SO2, Hg0are the most important pollutant in the flue gas. The application of non-thermal plasma (NTP) technology in the removal of NO, SO2, Hg0was reviewed respectively. Environmental applications have mainly involved plus corona discharge (PCD) and dielectric barrier discharge (DBD) system. In the future, the application of plasma technology in the flue gas could be focused on multiple pollutants synergistic mechanism.

Application of dielectric barrier discharge (DBD) plasma packed with glass and ceramic pellets for SO2 removal at ambient temperature: optimization and modeling using response surface methodology

“…Despite these incomparable advantages, NTP technology suffers from the drawbacks of high-energy consumption and the yielding of nitrogen oxides (NO x ) and ozone (O 3 ) as the main by-products [15][16][17]. Among these, the low energy efficiency of NTP technology has been considered by many researchers and packed-bed plasma reactors (PBRs) have shown good performance in this area [18][19][20][21].…”

Improving the Removal Efficiency of Elemental Mercury by Pre-Existing Aerosol Particles in Double Dielectric Barrier Discharge Treatments

“…Non-thermal plasma operated at atmospheric pressure is one of the promising technologies for converting gaseous elemental mercury (Hg 0 ) to oxidized mercury (Hg 2+ ) and particulate bound mercury (Hg p ) (Chen et al, 2006;Byun et al, 2011a), which can then be effectively removed by conventional air-pollution control devices (Clack, 2006). Most of the electrical energy of non-thermal plasmas is consumed to produce UV and reactive species such as O 3 , H 2 O 2 , radicals of OH, HO 2 , and O (Jia et al, 2013;Li et al, 2012). These reactive species and UV can oxidize Hg 0 at a high reaction rate.…”