In this paper, a three-level coupled rotating electrodes air plasma at atmospheric pressure is developed for evaluation of nitrogen fixation. Factors influencing the NO_x production rate and energy cost, including airflow rate, the input H₂O concentration, blade numbers at each rotating electrode and rotating speed, are examined. Air flow rates prove to have no effect on the rotational temperature of N₂ 337.1 nm and the emission intensities of N₂⁺ and N₂, but specific energy input (SEI) and species’ residence time can be shorter with higher air flow rates, resulting in lower NO_x concentration and energy cost. The addition of H₂O also has a positive effect on both NO_x concentration and energy cost. Optical emission spectrum (OES) shows that air + H₂O plasma has stronger 336 nm (NH) and 309 nm (OH) emission lines than air plasma, suggests NH and OH are the key species in NO_x enhancement. The most energy efficient conditions are found at airflow rate of 15 l min⁻¹, 12% H₂O concentration, with 4 blades on each rotating speed. Under these conditions, the lowest energy cost is observed to be 165 GJ/tN.

本文研制了一种三能级耦合旋转电极常压空气等离子体用于固氮评价。研究了影响 NO _x产生率和能源成本的因素，包括气流速率、输入 H ₂ O 浓度、每个旋转电极处的叶片数量和旋转速度。空气流速证明对 N ₂ 337.1 nm的旋转温度和 N ₂ ⁺和 N ₂的发射强度没有影响，但更高的空气流速可以缩短特定能量输入 (SEI) 和物质的停留时间，导致较低的NO _X浓度和能量成本。添加H ₂O 对 NO _x浓度和能源成本也有积极影响。发射光谱(OES)显示空气+H ₂ O等离子体比空气等离子体具有更强的336 nm (NH)和309 nm (OH)发射线，表明NH和OH是NO _x增强的关键物种。最节能的条件是在 15 l min ^{-1 的}气流速率、12% H ₂ O 浓度下，每个转速有 4 个叶片。在这些条件下，观察到的最低能源成本为 165 GJ/tN。