非热等离子体脱除湿法烟气脱硫排气氮氧化物和雾粒的研究

湿式静电除雾能够从根本上解决湿法烟气脱硫带来的酸雾和石膏雨污染问题，是我国鼓励发展的先进污染控制技术。从理论上分析，通过湿式静电除雾系统的改造，引入强氧化性非热等离子体，可望实现湿法烟气脱硫气雾环境中氮氧化物和雾粒的高效脱除。本项目针对如何实现NO高效氧化，继而又被雾粒和电极清洗液高效脱除的问题，采用由正直流高压供电的双区式非热等离子体反应器，研究非热等离子体注入气雾行为、雾粒在电场和气流惯性作用下的运动行为、典型湿法烟气脱硫排气环境中NO氧化及其脱除所涉及的物理化学过程、氮氧化物和雾粒脱除效率，以及能量消耗。旨在明确供电电压、电极配置、气雾和清洗液构成与NO氧化及其脱除的关系；优化等离子体反应器电极配置；确定影响NO氧化及其脱除效率、能量消耗的关键因素、主要活性组分和控制步骤；阐明NO氧化及其脱除的机制。为非热等离子体脱除湿法烟气脱硫排气氮氧化物和雾粒技术研发奠定基础。

In china, the apllication of wet electrostatic precipitation is widely being promoted because the air pollution problems, such as acid mist and gypsum rain from wet flue gas desulfurization, can be thoroughly solved by the advanced pollution control technology. Theoretically, high efficient removal of NOx and fine droplets from the exhaust of the wet flue gas desulfurization is possible by modifying the wet electrostatic precipitator and introducing oxidative non-thermal plasma into the precipitator. Being concerned with the problem of high efficient oxidization of NO by non-thermal plasma and absorption of NOx by the fine droplets and electrode cleaning solution, the introduction behavior of non-thermal plasma into the humid atmosphere, motion behavior of the droplets under the joint action of electrostatic force and inertial force, physical and chemical process about NO oxidation/removal from the exhaust of typical wet flue desulfurization, removal efficiencies of NOx and droplets as well as energy consumption will be investigated, based on a two-stage non-thermal plasma reactor energized by a positive high voltage power supply. The aims of the project are to define the relationship between NO oxidation/removal and applied voltage, electrode configuration, compositions of the exhaust and electrode cleaning solution, to optimize the electrode configurations of non-thermal plasma reactor, to determine the key factors, major active species and rate control steps affecting NO oxidation/removal and energy consumption, to clarify NO oxidation/removal mechanisms, finally, to lay the foundation of technology research & development of removal of NOx and fine droplets from the exhaust of wet flue gas desulfurization by non-thermal plasma.