Study On The Treatment Of Sulfur Dioxide By Fenton Catalyzed Synergistic Atomization Corona Discharge

Non-thermal plasma technology is used to treat atmospheric pollutants with high efficiency,fast reaction rate,and no secondary pollution.It is an advanced technology with great development prospects and research significance in solving environmental problems.The traditional corona discharge technology to remove pollutants has the disadvantages of small discharge current and poor treatment effect.Aiming at the shortcomings of corona discharge,in this paper,a self-made ground electrode atomization corona discharge device is used to generate non-thermal plasma for the purpose of removing SO₂in coal-fired flue gas.Through the Fenton reagent synergistic ground electrode atomization corona discharge device,that is,the use of non-thermal plasma and Fenton oxidation technology to enhance the desulfurization effect,and explore the influence of various experimental parameters on the discharge effect and desulfurization efficiency.The main conclusions of this paper are as follows:Under the same discharge conditions,the ground electrode atomization corona discharge（GEACD）is better than the traditional dry corona discharge,and the GEACD negative corona discharge current is better than the GEACD positive corona discharge.The discharge current increases with the increase of the cylinder electrode height,and decreases with the increase of the inter-electrode distance and gas flow rate.When the liquid flow rate of the on-line electrode is 25 m L/min,the inter-electrode distance is 25mm,and the cylinder electrode height is100mm,the discharge characteristics of the GEACD negative corona discharge are the best,that is,the optimal discharge current and discharge voltage are 110μA,14k V respectively;The discharge characteristics of the Fenton reagent synergistic atomization corona discharge have no change,that is,the addition of Fenton reagent has no effect on GEACD discharge characteristics.Under the same parameter conditions,the removal efficiency of SO₂by GEACD is better than that under the traditional dry corona discharge,the discharge voltage is proportional to the removal efficiency;The initial gas concentration and gas flow is inversely proportional to the removal efficiency,and the reverse air flow inlet direction is better than the removal efficiency in the direction of the flow inlet;The results show that the best experimental condition for the removal of SO₂by GEACD negative corona discharge are the initial concentration of 40mg/m~3,the gas flow of 15m L/min,the reverse flow direction,and the highest SO₂removal efficiency is 76%.The removal efficiency of Fenton reagent synergistic GEACD negative corona discharge for SO₂is better than the removal efficiency of only using GEACD negative corona discharge;When the discharge characteristics are the best,the SO₂removal efficiency is the largest;The best Fenton reagent ratio parameters for Fenton reagent synergistic GEACD negative corona discharge are Fe²⁺concentration of 2.0g/L,H₂O₂concentration of 6m L/L,p H value of 3,and the highest SO₂removal efficiency is 83%;With the increase of the input discharge voltage,the energy density under Fenton’s catalysis and GEACD and GEACD gradually increases,while the energy efficiency gradually decreases,then the energy consumption under Fenton’s catalysis and GEACD is higher than that of GEACD.