Study on the Removal of SO₂ from Simulated Flue Gas Using Dry Calcium-Spray with DBD Plasma

【摘要】 <正> In this study,lime-hydrate （Ca（OH）₂） desulfurizer was treated by plasma withstrong ionization discharge of a dielectric barrier.The removal of SO₂ from simulated flue gas wasinvestigated.The principles of SO₂ removal are discussed.Several factors affecting the efficiencyof SO₂ removal were studied.They included the ratio of calcium to snlfur （Ca/S）,desulfurizergranularity,residence time of the flue gas,voltage applied to the discharge electrode in the plasmagenerator,and energy consumption.Experimental results indicate that the increase in Ca/S ratio.the applied voltage and discharge power,the residence time,and the reduction in the desulfurizergranularity all can raise the SO₂ removal efficiency.The SO₂ removal efficiency was up to 91.3%under the following conditions,namely a primary concentration of SO₂ of 2262×10^-6 （v/v） inthe emission gas,21%（v/v） of oxygen,1.8% （v/v） of water,a Ca/S ratio of 1.48,a residence timeof 2.8 s,a 3.4 kV voltage and a 10 kHz frequency power applied to the discharge electrodes in theplasma generator,and a flow rate of 100 m³/h for emission gas.更多还原

【Abstract】 In this study,lime-hydrate （Ca（OH）₂） desulfurizer was treated by plasma with strong ionization discharge of a dielectric barrier.The removal of SO₂ from simulated flue gas was investigated.The principles of SO₂ removal are discussed.Several factors affecting the efficiency of SO₂ removal were studied.They included the ratio of calcium to snlfur （Ca/S）,desulfurizer granularity,residence time of the flue gas,voltage applied to the discharge electrode in the plasma generator,and energy consumption.Experimental results indicate that the increase in Ca/S ratio. the applied voltage and discharge power,the residence time,and the reduction in the desulfurizer granularity all can raise the SO₂ removal efficiency.The SO₂ removal efficiency was up to 91.3% under the following conditions,namely a primary concentration of SO₂ of 2262×10^-6 （v/v） in the emission gas,21%（v/v） of oxygen,1.8% （v/v） of water,a Ca/S ratio of 1.48,a residence time of 2.8 s,a 3.4 kV voltage and a 10 kHz frequency power applied to the discharge electrodes in the plasma generator,and a flow rate of 100 m³/h for emission gas.更多还原