Study On Desulfuration From Simulative Flue Gas Using Narrow Gap Discharge

The coal is the main energy sources in our country. SO₂ pollution deriving from burning coal has been the main characteristic of atmospheric pollution in our country. Therefore the treatment of SO₂ pollution must been carried out as soon as possible. For typical desulfuration technologies have many problems such as high cost, waste water producing, NH3 adding, low electron energy, etc, the method of desulfuration using OH radicals produced by strong electric field ionization discharge is presented in this paper, which is based on the key NSFC project "Studies of Method and Application of Gas Molecules Ionized with Strong Electric at High Pressure Field" (No.: 60031001). It is a kind of new desulfuration technology.Using the narrow gap strong electric field ionization discharge technology, the strong electric field whose intensity is high up to 400Td is formed in the chamber of the plasma reactor. Thanks to the high electric field, a great number of energetic electrons are produced whose electron mean energy, electron density and fractional active volume are 10eV, 10¹⁴/cm³ and 2%, respectively. The energetic electrons can provide enough energy for plasma chemical reactions. They can ionize H₂O and O₂ to form OH , e_aq-radicals and SO₂ can be removed by the oxidization of SO₂ to H2SO4 by these radicals.The new experimental system is established. The findings are the SO₂ removal efficiency can be enhanced by increasing the excitation voltage, excitation frequency, excitation power, H₂O concentration, O₂ concentration or decreasing SO₂ initial concentration, simulative flue gas total flux and discharge gap. The changing rule of desulfuration efficiency will not be changed if the discharge area of plasma reactor is changed. In this paper, the comparison of effect intensity on desulfuration efficiency of water and oxygen concentration of simulation flue gas is also made, and the conclusion is drawn that the effect of water concentration of gas on desulfuration efficiency is larger than that oxygen concentration do. The experimental results show when the discharge gap, excitation voltage, excitation frequency, simulative flue gas total flux, O₂...