Study of SO/sub 2/ removal using non-thermal plasma induced by corona discharge

Summary form only given. Application of plasma chemistry for gas cleaning is gaining prominence in recent years, mainly from the energy consideration point of view. Normally, the gas treatment is carried out at or above room temperature by the conventional dry-type corona reactor. However, this treatment is still inadequate for the removal of certain stable gases present in the flue gas mixture. In this paper, a new plasma reactor electrode configuration was used to remove SO₂ from the flue gas. A high voltage needle electrode was submerged in the liquid phase while the plate ground electrode was placed in the gas above the liquid surface, resulting in a gas phase discharge in addition to the liquid phase discharge. The method of generating the radicals from H₂O with positive DC corona discharge and the influence of the needle-plate electrode system on SO₂ removal efficiency were experimentally studied. As a result, high amounts of hydrogen peroxide and dissolved ozone were found in the liquid. This new electrode configuration led to high SO₂ removal efficiencies under several different operating conditions