气液两相滑动弧放电中自由基的光谱研究

气液两相滑动弧放电是近年来出现的一种新型低温等离子体废水处理技术,对高浓度有机废水具有很好的降解效果.为了认识气液两相滑动弧放电降解有机废水的机理,用发射光谱法对气液两相滑动弧在空气中放电所产生的主要自由基进行了实验研究,分析了自由基持续再生的化学过程.通过对光谱线强度变化的分析,得到了OH和NO自由基谱线强度在放电反应空间的分布特点,以及输入电压和液相(水)流量因素对OH和NO自由基产生过程的影响.结果表明:OH是气液两相滑动弧放电的主导自由基,OH和NO自由基谱线强度沿着电极中轴均先增后减;在非平衡区域,自由基谱线强度随着输入电压的增大而增大;OH自由基谱线强度随水流量的增大而增大,NO自由基谱线强度则随着水流量的增大而减小.

Emission Spectroscopy Diagnosis of the Radicals Generated in Gas-Liquid Phases Gliding arc Discharge

Gas-liquid phases gliding arc discharge has been investigated as a potential treatment technology for liquid phase pollution treatment.To further understand the interaction mechanisms of gas-liquid phase gliding arc degradation process for the wastewater treatment,the characteristics of major reactive species(the OH and NO radicals) in a gas-liquid gliding arc at atmospheric pressure have been investigated by using optical emission spectroscopy.The chemical reactions that may lead to the generation of free radicals in the discharge were discussed.The influence of operating conditions(water feed rate,input voltage etc.) on the relative intensity of radical emission was studied.The results show that axial evolution of the relative emission intensity of both reactive species exhibit the similar tendency under the same operating conditions.In non-thermodynamic equilibrium region of the arc discharge,the intensities of both radicals increase with the input voltage.In addition,the intensity of OH radical increases with the water feed rate,while the opposition phenomena are observed for NO radical.