Calculation of the decomposition products of C5F10O-Air mixtures from 500 K to 3500 K with a chemical kinetic model

IF 2.6 3区物理与天体物理 Q3 ENGINEERING, CHEMICAL

Plasma Chemistry and Plasma Processing Pub Date : 2024-07-01 DOI:10.1007/s11090-024-10485-5

Qingqing Gao, Xiaohua Wang, Haofei Sun, Aijun Yang, Chunping Niu

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Abstract

C₅F₁₀O-Air mixtures have a great potential to replace SF₆ in medium-voltage power equipment. However, during the partial overheating or arc discharge, C₅F₁₀O-Air mixtures are inevitably to decompose to form various byproducts. The local chemical non-equilibrium and local thermal non-equilibrium appears due to the finite reaction rates and insufficient energy change between species. This paper establishes a chemical kinetic model to calculate the decomposition byproducts of C₅F₁₀O-Air mixtures from 500 K to 3500 K by taking into account the local thermal non-equilibrium and local chemical non-equilibrium simultaneously. The chemical kinetic model contains 50 species and 249 reactions. All the reactions are assumed to be reversible except the reactions producing photos. The local thermal non-equilibrium is characterized by the difference of the electron temperature (T_e) and the temperature of heavy species (T_h). In this work, the ratio of T_e to T_h is determined to be a function of the electron number density. Therefore, the value varies with electron number density. The temperature dependent decomposition composition of C₅F₁₀O-Air mixtures with C₅F₁₀O content to be 5%, 10% and 15% are obtained. In order to investigate the effects of Air on the decomposition of C₅F₁₀O, the decomposition products of pure C₅F₁₀O from 500 K to 3500 K are also investigated. In addition, the main chemical processes in 0.1C₅F₁₀O-0.9Air mixture are investigated by capturing the main reaction pathways. The main reaction pathways can help interpret the formation mechanism of the decomposition products.

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利用化学动力学模型计算 500 K 至 3500 K C5F10O-Air 混合物的分解产物

在中压电力设备中，C5F10O-空气混合物具有取代 SF6 的巨大潜力。然而，在局部过热或电弧放电过程中，C5F10O-空气混合物不可避免地会分解形成各种副产品。由于反应速率有限，物种间能量变化不充分，会出现局部化学非平衡和局部热非平衡。本文建立了一个化学动力学模型，通过同时考虑局部热非均衡和局部化学非均衡，计算 500 K 至 3500 K C5F10O-Air 混合物的分解副产物。化学动力学模型包含 50 个物种和 249 个反应。除产生光的反应外，所有反应均假定为可逆反应。局部热非均衡的特征是电子温度（Te）和重金属温度（Th）之差。在这项研究中，Te 与 Th 之比被确定为电子数密度的函数。因此，该值随电子数密度的变化而变化。在 C5F10O 含量为 5%、10% 和 15%的 C5F10O-Air 混合物中，得到了随温度变化的分解成分。为了研究空气对 C5F10O 分解的影响，还研究了纯 C5F10O 在 500 K 至 3500 K 的分解产物。此外，通过捕捉主要反应途径，研究了 0.1C5F10O-0.9Air 混合物中的主要化学过程。主要反应途径有助于解释分解产物的形成机理。

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来源期刊

Plasma Chemistry and Plasma Processing 工程技术-工程：化工

CiteScore

5.90

自引率

8.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Publishing original papers on fundamental and applied research in plasma chemistry and plasma processing, the scope of this journal includes processing plasmas ranging from non-thermal plasmas to thermal plasmas, and fundamental plasma studies as well as studies of specific plasma applications. Such applications include but are not limited to plasma catalysis, environmental processing including treatment of liquids and gases, biological applications of plasmas including plasma medicine and agriculture, surface modification and deposition, powder and nanostructure synthesis, energy applications including plasma combustion and reforming, resource recovery, coupling of plasmas and electrochemistry, and plasma etching. Studies of chemical kinetics in plasmas, and the interactions of plasmas with surfaces are also solicited. It is essential that submissions include substantial consideration of the role of the plasma, for example, the relevant plasma chemistry, plasma physics or plasma–surface interactions; manuscripts that consider solely the properties of materials or substances processed using a plasma are not within the journal’s scope.