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首页> 外文期刊>Plasma Sources Science & Technology >CO2 conversion in a gliding arc plasma: 1D cylindrical discharge model
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CO2 conversion in a gliding arc plasma: 1D cylindrical discharge model

机译：CO2转换在滑动弧等离子体中：1D圆柱放电模型

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CO2 conversion by a gliding arc plasma is gaining increasing interest, but the underlying mechanisms for an energy-efficient process are still far from understood. Indeed, the chemical complexity of the non-equilibrium plasma poses a challenge for plasma modeling due to the huge computational load. In this paper, a one-dimensional (1D) gliding arc model is developed in a cylindrical frame, with a detailed non-equilibrium CO2 plasma chemistry set, including the CO2 vibrational kinetics up to the dissociation limit. The model solves a set of time-dependent continuity equations based on the chemical reactions, as well as the electron energy balance equation, and it assumes quasi-neutrality in the plasma. The loss of plasma species and heat due to convection by the transverse gas flow is accounted for by using a characteristic frequency of convective cooling, which depends on the gliding arc radius, the relative velocity of the gas flow with respect to the arc and on the arc elongation rate. The calculated values for plasma density and plasma temperature within this work are comparable with experimental data on gliding arc plasma reactors in the literature. Our calculation results indicate that excitation to the vibrational levels promotes efficient dissociation in the gliding arc, and this is consistent with experimental investigations of the gliding arc based CO2 conversion in the literature. Additionally, the dissociation of CO2 through collisions with O atoms has the largest contribution to CO2 splitting under the conditions studied. In addition to the above results, we also demonstrate that lumping the CO2 vibrational states can bring a significant reduction of the computational load. The latter opens up the way for 2D or 3D models with an accurate description of the CO2 vibrational kinetics.
机译：滑动电弧等离子体的二氧化碳转化正受到越来越多的关注，但节能过程的潜在机制仍远未被理解。事实上，由于计算量巨大，非平衡等离子体的化学复杂性对等离子体建模提出了挑战。本文在圆柱框架内建立了一维（1D）滑动电弧模型，并建立了详细的非平衡CO2等离子体化学装置，包括CO2振动动力学直至解离极限。该模型基于化学反应和电子能量平衡方程，求解了一组与时间相关的连续性方程，并在等离子体中假设了准中性。通过使用对流冷却的特征频率来解释横向气流对流造成的等离子体种类和热量损失，该特征频率取决于滑动电弧半径、气流相对于电弧的相对速度以及电弧延伸率。本文中等离子体密度和等离子体温度的计算值与文献中关于滑动电弧等离子体反应器的实验数据具有可比性。我们的计算结果表明，对振动能级的激发促进了滑动弧中的有效离解，这与文献中关于基于滑动弧的CO2转化的实验研究一致。此外，在所研究的条件下，通过与O原子碰撞的CO2离解对CO2裂解的贡献最大。除上述结果外，我们还证明了将CO2振动状态集总可以显著减少计算量。后者为精确描述CO2振动动力学的2D或3D模型开辟了道路。

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