Abstract: A streamer plasma induced flue gas desulfurization (FGD) technique is reported. An AC/DC superposition electric source generated a spatially well distributed plasma in an industrial scale reactor. Instead of the traditional dry technique,a partitioned wet reactor system was adopted. A streamer plasma oxidation technique was developed to solve the problem in the oxidation of concentrated ammonium sulfite solution. The ammonia slip was well controlled. The liquid byproduct was dried up to form solid ammonium sulfate. Pilot test under the conditions of an initial concentration of 500—1000 μl·L-1 of SO2 demonstrated the desulfurization efficiency greater than 95%. The oxidation efficiency through one cycle reached 50%—70%, the energy consumption in the reactor was less than 3. 5 W·h·m-3, and the ammonia slip was less than 5 μl·L-1. The byproduct was ammonium fertilizer. Under the conditions of using high concentration OH radicals excited with AC/DC streamer plasmas, an oxidation rate with practical value can be achieved at a sulfite concentration of over 3 mol·L-1.

摘要： 介绍一种流光放电烟气脱硫湿法工艺流程，其特征是：(1)采用交直流叠加(AC/DC)方式在工业型反应器发生分布良好的流光放电等离子体；(2)取代传统等离子体干法技术，采用分区湿式反应器系统，大幅降低能耗，无产物粘壁；(3)采用可规模化的流光放电等离子体氧化技术，实现高浓度亚硫酸铵氧化；(4)控制尾气氨逸出；(5)生成液浓缩脱水结晶干燥制得固体硫酸铵。通过半工业试验，在SO2初始浓度500～1000 μl·L-1 条件下，脱硫率≥95%，亚硫酸盐一次氧化率50%～70%，适当处理后达到90%以上，反应器能耗小于3. 5 W·h·m-3，氨逸出在5 μl·L-1以下，副产回收适合农用的铵肥。在吸收液盐浓度3 mol·L-1下还可以获得有实用价值的反应速度，显示出良好的工业应用前景。