Gliding arc plasma for CO2 conversion: Better insights by a combined experimental and modelling approach
Gliding arc plasma for CO2 conversion: Better insights by a combined experimental and modelling approach
复制标题
DOI：
10.1016/j.cej.2017.07.133
复制
发表时间：
2017-12
影响因子：
15.1
通讯作者：
Weizong Wang;D. Mei;X. Tu;A. Bogaerts
中科院分区：
文献类型：
--
作者：
Weizong Wang;D. Mei;X. Tu;A. Bogaerts
由于其非平衡特性，滑行弧等离子体是将co2转化为CO和O2的一种潜在方式，但其潜在机制尚不清楚。本文建立了一个自洽二维（2D）滑动弧模型，该模型具有详细的非平衡co2等离子体化学，并通过实验进行了验证。等离子体中电子数密度、co2转化率和能量效率的计算值与实验结果吻合较好，表明该模型能较好地反映等离子体化学过程。将实验结果与经典的热转化以及文献报道的其他基于等离子体的co2转化技术进行比较，证明了滑翔弧的非平衡特性，表明滑翔弧是一种很有前途的co2转化等离子体反应器。然而，应该利用一些工艺修改来进一步提高其性能。由于该模型提供了等离子体行为的真实图像，我们首先使用它来研究整个滑动弧周期中的等离子体特征，这对于理解潜在的机制是必要的。随后，我们进行了化学动力学分析，以研究二氧化碳损失和形成的不同途径。基于所揭示的放电特性和潜在的二氧化碳等离子体化学，该模型允许我们提出如何进一步提高滑行电弧等离子体的二氧化碳转换和能源效率的解决方案。
A gliding arc plasma is a potential way to convert CO2into CO and O2, due to its non-equilibrium character, but little is known about the underlying mechanisms. In this paper, a self-consistent two-dimensional (2D) gliding arc model is developed, with a detailed non-equilibrium CO2plasma chemistry, and validated with experiments. Our calculated values of the electron number density in the plasma, the CO2conversion and energy efficiency show reasonable agreement with the experiments, indicating that the model can provide a realistic picture of the plasma chemistry. Comparison of the results with classical thermal conversion, as well as other plasma-based technologies for CO2conversion reported in literature, demonstrates the non-equilibrium character of the gliding arc, and indicates that the gliding arc is a promising plasma reactor for CO2conversion. However, some process modifications should be exploited to further improve its performance. As the model provides a realistic picture of the plasma behaviour, we use it first to investigate the plasma characteristics in a whole gliding arc cycle, which is necessary to understand the underlying mechanisms. Subsequently, we perform a chemical kinetics analysis, to investigate the different pathways for CO2loss and formation. Based on the revealed discharge properties and the underlying CO2plasma chemistry, the model allows us to propose solutions on how to further improve the CO2conversion and energy efficiency by a gliding arc plasma.