流光放电等离子体氨法烟气脱硫工艺  

Streamer plasma induced ammonia flue gas desulfurization

作　　者：胡小吐[1] 姜学东[1] 朱天乐[2] 王毅[1] 邱瑞昌[1] 张鸿迪 李瑞年 阎克平 

机构地区：[1]北京交通大学电气工程学院,北京100044 [2]北京航空航天大学环境工程系,北京100083 [3]广东杰特科技发展有限公司,广东广州510630

出　　处：《化工学报》2007年第4期1001-1006,共6页CIESC Journal

基　　金：国家高技术研究发展计划项目(2002AA529140;2004AA529310);广东省科技厅重大科技专项基金(2001A3040201)~~

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500～1000μl·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3．5W·h·m^-1，氨逸出在5μl·L^-1以下，副产回收适合农用的铵肥。在吸收液盐浓度3mol·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。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 3mol·L^-1.

关 键 词：流光放电 氨法烟气脱硫 AC/DC叠加电源 亚硫酸铵氧化 等离子体氧化 

分 类 号：X701.3[环境科学与工程—环境工程]