NaOH气液两相滑动弧放电处理含硫废气的研究

为了提高气液两相滑动弧放电对火电厂废气的处理效率,将传统的纯水液相替换成NaOH溶液。通过观测放电过程中的电压-电流波形和发射光谱,研究加入NaOH对滑动弧放电的电气特性和光学特性的影响。选取SO_2作为待处理废气,对比分析NaOH溶液、纯水液相下SO_2的去除率以及产物浓度随处理时间、气体流速的变化情况,以及NaOH溶液浓度对SO_2去除结果的影响。实验结果表明,相同条件下,NaOH溶液代替纯水液相增强了气液两相放电强度,电离出更为大量的OH自由基;同时,NaOH的加入使SO_2的去除率提高了5%~7%,产物中的SO3含量较纯水液相时降低了50%左右。

Treatment of Flue Gas Containing Sulfur by Gas-Liquid Phase Gliding Arc Discharge Combined with NaOH

To improve the efficiency of gas-liquid two-phase gliding arc discharge to treat thermal power plant waste gas,the traditional pure water phase is replaced by NaOH solution.In this study,through the measurements of applied voltage,discharging current and emission spectrum,the influence of NaOH on electrical and optical characteristics of the discharge is analyzed.The concentration of SO2 is selected as the observation index.Then the SO2 removal efficiencies of NaOH and pure water phase have been analyzed.The product concentrations under different experimental conditions are also discussed,such as discharge time and gas flow rate.The results show that NaOH solution instead of pure water phase enhances discharge strength under the same conditions,and intense ionization in the discharge produces a large number of OH radicals.At the same time,compared with pure water,the sulphur removal efficiency of NaOH solution increases by 5％～7％,while the product of SO3 content reduces by about 50％.