The influence of water on corona discharge in the flue gas

In this paper a novel type of a water film corona discharge experiment model is designed. 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). The mechanism of the formation of corona discharge in the pollution flue gas containing sulfur dioxide (SO₂) and nitrogen oxides (NO_x) is investigated under the conditions that there are different concentration of sulfur dioxide and nitrogen oxides of the flue gas and different applied voltages. Based on this the emphasis is on studying the influence of water on corona discharge in flue gas. The experimental results show that the corona wind forming between high-voltage electrode and water film by corona discharge enhances the cleansing efficiency of the flue gas because of the existence of the water film, and the cleaning efficiency will increase with the increase of the voltage under a definite range of applied voltage. According to this effect a water film electrical corona reactor that we design is used to treat the flue gas of the boiler, and the result shows it not only makes the removal efficiency of dust up to 100%, but also makes about 98% of SO₂ and 85% of NO_x removal respectively 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 electrical dust precipitator.