氧气对非平衡等离子体脱除NO的影响

在非平衡等离子体脱除模拟气体系统NO-N₂中NO的物理化学模型基础上,加入O₂,通过对不同O₂初始浓度下NO的脱除过程进行数值模拟,跟踪主要成分粒子NO、NO₂浓度随时间的变化,得到了O₂初始浓度对系统中主要粒子浓度和NO脱除的影响规律。计算结果表明：O₂的存在对非平衡等离子体脱除NO有负面影响,O₂的加入导致NO的脱除率降低,O₂浓度越高,NO的脱除率降低越多;O₂的加入使产物中NO₂的生成量增加,体系内所生成的NO₂是非平衡等离子体和O₂共存的产物;O₂存在情况下,电子平均能量越高,导致的NO脱除率降低得越多。

The Influence of Oxygen on NO Removal by Non-equilibrium Plasma

On the basis of the physical and chemical models of NO in non-equilibrium plasma based gas removal system NO-N₂, the numerical simulation of NO removal process is conducted under different O₂ initial concentrations to study the evolution of NO and NO₂ concentrations varying with time. The influence of O₂ initial concentration on the concentrations of main particles and NO removal is studied. The calculation results show that the presence of O₂ has negative impacts on NO removal by non-equilibrium plasma. The NO removal efficiency reduces in the presence of O₂. The higher concentration of O₂ will lead to more decrease of NO removal efficiency. The adding of O₂ increases the NO₂ production as the result of the coexistence of non-equilibrium plasma and O₂. In the presence of O₂, the higher electron average energy will lead to further decrease of NO removal efficiency.