基于DOAS测量技术的DBD脱除NO的实验研究

发布时间：2018-05-31 11:49

本文选题：介质阻挡放电等离子体 + 紫外差分吸收光谱　；参考：《华北电力大学》2017年硕士论文

【摘要】：全球环境尤其是大气环境的污染得到了世界各国的广泛关注。在我国,电厂排放的气体污染物给大气环境带来了严重威胁,污染气体的脱除及浓度监测系统是目前的研究热点。介质阻挡放电(DBD)是常用的等离子体产生方式,在脱除污染气体方面有广阔的发展前景。本文以介质阻挡放电等离子体脱除NO为研究方向,结合电厂CEMS系统中常用的紫外差分光谱测量技术(DOAS),进行了相关的实验研究。根据DBD脱除NO反应及DOAS测量原理设计了实验台。使用多项式拟合和低通滤波的方法分离光谱的快变部分和慢变部分,并减小了测量误差,在实验条件下得到了较为“纯净”的NO气体吸收截面,用于其他实验中未知浓度的NO气体的测量。利用DBD反应器模拟烟气中NO气体的脱除实验。通过设定不同入口NO浓度、不同气体流量、不同气体温度,添加不同浓度的Ar、SO2、O2的不同实验条件,利用DOAS测量技术得到了DBD脱除NO气体的脱除效率。实验结果表明:随着入NO浓度的增加,NO的脱除效率下降;混合气体流量越大,流速越快,NO气体的脱除效率越低;随着气体温度的增加,DBD脱除NO的效率没有明显变化;Ar可以增强DBD反应器的放电强度和NO气体的脱除效率,Ar浓度越高,NO气体的脱除效率越高;添加SO2降低了NO气体的脱除效率,SO2浓度越高,NO脱除效率越低;O2的加入明显抑制了NO的脱除,随着O2浓度的增加,NO气体的脱除效率显著下降,但在Ar气氛下下降趋势并不明显。论文最终实现了利用DOAS技术对DBD脱除NO的效率进行了测量。作为应用基础研究,本文对改进放电反应器结构、提高NO脱除效率有一定的参考价值,对未来进行电厂气体污染物的脱除、测量一体化的应用研究有一定的现实意义。
[Abstract]:The pollution of the global environment, especially the atmospheric environment, has been concerned by many countries all over the world. In China, the emission of gas pollutants from power plants has brought a serious threat to the atmospheric environment, and the removal of polluting gases and the concentration monitoring system are the hot research topics at present. Dielectric Barrier discharge (DBD) is a common plasma generation method, which has a broad prospect in the removal of polluting gases. In this paper, the removal of no by dielectric barrier discharge (DBD) plasma is taken as the research direction, combined with the commonly used UV differential spectrum measurement technique in power plant CEMS system, the related experimental research has been carried out. The experimental bench was designed according to the reaction of DBD removal of no and the principle of DOAS measurement. Polynomial fitting and low-pass filtering are used to separate the fast and slowly varying parts of the spectrum, and the measurement error is reduced, and the absorption cross section of no gas is obtained under the experimental conditions. It is used to measure no gas with unknown concentration in other experiments. The experiment of no removal from flue gas was simulated by DBD reactor. By setting different experimental conditions of different inlet no concentration, different gas flow rate, different gas temperature and adding different concentration of Arsuch _ 2O _ 2, the removal efficiency of no _ 2 removal by DBD was obtained by using DOAS measurement technique. The experimental results show that the removal efficiency of no decreases with the increase of no concentration, and the faster the flow rate of mixed gas is, the lower the removal efficiency of no is. With the increase of gas temperature, there is no obvious change in the removal efficiency of no. Ar can enhance the discharge intensity of DBD reactor and the removal efficiency of no gas. The higher the concentration of ar is, the higher the removal efficiency of no gas is. The addition of SO2 reduced the removal efficiency of no gas the higher the concentration of so _ 2 was, the lower the removal efficiency of no was. The addition of O _ 2 significantly inhibited the removal of no. The removal efficiency of no gas decreased significantly with the increase of O _ 2 concentration, but the decreasing trend was not obvious in ar atmosphere. Finally, the efficiency of no removal by DBD is measured by DOAS technology. As a basic application research, this paper has certain reference value for improving the structure of discharge reactor and improving the removal efficiency of no, and has certain practical significance for the application research of gas pollutant removal and measurement integration in power plant in the future.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X773

【参考文献】