Flue gas cleaning using wet-type electrostatic precipitator

Recently, SO₂ and NO_x have become serious air pollutant such as photochemical smog and acid rain. In spite of an attempt to reduce the amount of SO₂ and NO_x emitted, the density of SO₂ and NO_x in the atmosphere has remained on a stable level, or even become worse. Here, we designed a novel type of a water film corona discharge experiment model. The reactor is composed of needle-plate electrodes that are placed in a glass container filled with the flue gas, (the plate electrode is immersed in the water). In this paper, we emphasized on studying the influence of water on removal rates of NO and SO₂. The experimental results show that the corona wind forming between high-voltage electrode and water film by corona discharge enhances the cleaning efficiency of the flue gas because of the existence of the water film, and the cleaning efficiency will increase with the increase of DC applied voltage within definite range. According to this effect a water film electrical corona reactor designed is used to treat the simulate flue gas, and the result shows it not only gains the removal efficiency of SO₂ up to 98%, but also gains about 85% of NO_x removal under suitable conditions. This project is very significant for the prevention of acid rain and the treatment of dust of flue gas and the improvement on the traditional electrostatic precipitator.