摘要
燃煤污染物的排放为环境带来负担,减少燃煤烟气污染是控制大气环境污染的重要措施,脱硫脱硝脱汞则是烟气污染控制的重点。综述现有介质阻挡放电脱除燃煤烟气污染物研究,介绍介质阻挡放电脱除燃煤污染物机理,分析了不同结构介质阻挡放电反应器的放电原理及应用场景,主要包括空间型介质阻挡放电、沿面型介质阻挡放电、共面型介质阻挡放电、填充型介质阻挡放电和两段式介质阻挡放电;归纳了反应器反应参数、气体成分以及气体间的相互作用对脱除NO_(x)、SO_(2)和Hg^(0)的影响。讨论了催化剂协同介质阻挡放电脱除燃煤污染物与单介质阻挡放电脱除污染物的区别。确定高效率脱除NO_(x)、SO_(2)和Hg^(0)的最佳方式。随介质阻挡放电的电压和频率增加,污染物脱除效率呈增加趋势,但频率进一步增加会降低脱除效率。O_(2)在一定范围内可促进NO和Hg的氧化。微量H_(2)O在高能电子作用下产生OH^(-)和HO_(2-),从而促进SO_(2)和Hg氧化;但过量H_(2)O会抑制污染物脱除。NH3能促进NO和SO_(2)的氧化。介质阻挡放电通过激活催化剂表面产生电子和空穴,促进NO、SO_(2)和Hg^(0)的氧化,从而具有更优的污染物氧化性能。
Air pollution brings a great burden to the environment and the reduction of flue gas pollutants is one of the most important measures to control the air pollution.The desulfurization,denitration and mercury removal are the key points in the limitation of flue gas pollution.The paper reviewed the mechanism of dielectric barrier discharge for removing flue gases,and the effects of different reactor parameters,gas composition and gas interaction on the removal of NO_(x),SO_(2) and Hg^(0) were analyzed.The main application of different dielectric barrier discharge reactor was introduced and the reactor can be divided into volume dielectric barrier discharge,surface dielectric barrier discharge,coplanar dielectric barrier discharge,filling dielectric barrier discharge and two stage type dielectric barrier discharge.The removal of flue gases by Co catalyst barrier discharge and single dielectric barrier discharge was studied.Last,the best way to remove NO_(x),SO_(2) and Hg^(0) was obtained.As the voltage and frequency of dielectric barrier discharge increase,the efficiency of pollutant removal shows an increasing trend,but further increasing the frequency decreases the removal efficiency.O_(2) can promote the oxidation of NO and Hg within a certain range.Trace amounts of H_(2)O under high-energy electron action produce OH^(-)and HO_(2-),thereby promoting the oxidation of SO_(2) and Hg.However,excess H_(2)O can inhibit the removal of pollutants.NH3 can promote the oxidation of NO and SO_(2).Dielectric barrier discharge activates catalyst surfaces to generate electrons and holes,promoting the oxidation of NO,SO_(2),and Hg^(0),thus exhibiting superior oxidative performance for pollutants.
作者
潘晓文
张苗
宋捷
李朝兵
赖金平
于洁
PAN Xiaowen;ZHANG Miao;SONG Jie;LI Zhaobing;LAI Jinping;YU Jie(Guoneng Jiujiang Power Generation Co.,Ltd.,Jiujiang 332000,China;Guoneng Nanjing Electric Power Testing and Research Co.,Ltd.,Nanjing 210046,China;State Key Lab of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《洁净煤技术》
CAS
CSCD
北大核心
2024年第S01期14-23,共10页
Clean Coal Technology