THE REACTION CHARACTERISTICS OF NO AND SO 2 IN THE DIELECTRIC BARRIER DISCHARGE PLASMA PROCESS.

Many factors affect the reaction characteristics of nitrogen oxides and SO₂ in a dielectric barrier discharge reactor. Changing the SO₂ initial concentration, oxygen content and water vapor content to study the reaction mechanism of NO and SO₂ in the dielectric barrier discharge plasma process has been conducted. It was shown that the initial concentration of SO₂ varied in a larger scope has little effect on the reaction characteristics of NO and SO₂ in the N₂/SO₂/NO system. Increasing the water vapor content in the N₂/NO/SO₂/HO system would reduce the concentration of SO₂ significantly in the flue gas, and the influence on SO₂ is more obvious than on NO. Then, the influence of oxygen on the reaction characteristics of SO₂ is not obvious, increasing the O₂ concentration in the N₂/NO/SO₂/O₂ system, the changed of SO₂ concentration is less than 10%. But the adding of O₂ affects the reaction of NO in the dielectric barrier discharge process obviously, it can promote the conversion of NO₂ and other NO_x, at the same time, the generation of NO was also being accelerated under certain conditions. By analyzing the reaction mechanism, it was found that the activated radicals produced in the dielectric barrier discharge process concerned SO₂ reaction mainly OH, while related the reaction of NO, the O and N play an important role. Through the experiment and analysis, it was also deduced that there are oxidation and reduction reactions existed at the same time, also the generation and removal of NO occurred simultaneously. [ABSTRACT FROM AUTHOR]