非平衡等离子体特征量对NO脱除效率的影响

Effect of Non-Equilibrium Plasma Characteristics on NO Removal Efficiency

采用数值模拟的方法开展了非平衡等离子体脱除烟气中NO的研究,考察了非平衡等离子体放电中的2个主要特征量(电子数密度ne和电子平均能量)对NO脱除效率的影响。计算结果表明,NO脱除效率随电子数密度ne和电子平均能量的变化而有不同程度的变化,相比较而言,电子数密度量级变化对NO脱除效率的影响更大。在NO初始分子浓度(粒子数密度)为1016cm-3情况下,电子数密度较高(1017cm-3)时,即使电子平均能量低至4 eV,也可获得高达99%的NO脱除效率。当电子数密度和电子平均能量保持不变时,NO脱除效率随着NO初始分子浓度的增加而降低。

The numerical simulation method is adopted to study NO removal from the flue gas by non-equilibrium plasma. The influence of two major characteristics in non-equilibrium plasma （electron number density ne and electron average energy e） on NO removal efficiency is investigated. The simulation results show that the NO removal efficiency varies with the electron number density ne and the electron average energy e. In comparison, the electron number density plays a much more important role in NO removal efficiency. When the initial concentration of NO is 1016cm-3and the electron density is high（ne≥1017cm-3）, the NO removal efficiency can get up to 99% even though the electron average energy is as low as 4eV. Given constant density of the electron number and the average electron energy, the NO removal efficiency worsens as the initial concentration of NO rises.