Yu Gang, Yu Qi, Jiang Yan-Long, Zeng Ke-Si
Department of Man-Machine and Environment Engineering, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
J Environ Sci (China). 2005;17(4):627-30.
As a new type of NO removal system, NO reduction in N2-NO plasma was applied to solve the difficulties in the traditional methods, such as higher energy-consumption, larger equipment size and high cost, and so on. Using the experimental NO reduction system with single-pair electrode tip discharge structure, the NO reduction characteristics of N2-NO system were revealed to guide the engineering practice; the results of NO reduction with single-pair electrode tip discharge plasma also have the same instructive meaning to the NO reduction with multi-pair electrode tip discharge plasma. The amount of both active N atom and NO removal rate increased with the distance /g increasing between the two electrode tips and then dropped when the distance exceeded a certain value. The NO removal rate increased while the voltage between two electrode tips or the resident time of gas flow increased. The distance is a key geometrical variable factor that can determine the intensity of electric field between two electrode tips and the resident time of gas. In this paper, the effects of the dielectric features on NO reduction using dielectric-barrier discharge plasma system were also studied. The results of NO removal rate with different dielectrics such as Al2O3, CaO, MgO and glass showed that the electric field intensity is different with different dielectric, because it brings different energy to particles in discharge room and thus it causes different NO removal rate.
作为一种新型的NO去除系统，N2 - NO等离子体中的NO还原技术被应用于解决传统方法中存在的难题，如高能耗、设备尺寸大及成本高等问题。利用具有单对电极尖端放电结构的实验性NO还原系统，揭示了N2 - NO系统的NO还原特性以指导工程实践；单对电极尖端放电等离子体的NO还原结果对多对电极尖端放电等离子体的NO还原也具有同样的指导意义。活性N原子数量和NO去除率均随着两个电极尖端之间的距离/g增大而增加，当距离超过一定值时则下降。随着两个电极尖端之间的电压或气流停留时间增加，NO去除率升高。距离是一个关键的几何变量因素，它能决定两个电极尖端之间的电场强度和气体的停留时间。本文还研究了介质特性对使用介质阻挡放电等离子体系统进行NO还原的影响。使用Al2O3、CaO、MgO和玻璃等不同介质的NO去除率结果表明，不同介质的电场强度不同，因为它给放电室内的粒子带来不同能量，从而导致不同的NO去除率。
