2016-06-292024-05-15https://scholars.lib.ntu.edu.tw/handle/123456789/665789摘要：計畫假設直流電漿火炬產生之電漿氣體具光學扁薄性、電漿氣體為電中性以及穩態軸對稱流動，基於達到局部熱平衡態的電漿氣體熱力學與傳輸係數，以有限體積法聯立求解連續方程式、動量方程式、能量方程式、紊流方程式以及電流連續方程式，使用安培定律計算流場電流分佈，利用歐姆定律計算磁場大小，建立計算流體力學模型以描述電漿火炬生成之高溫與高速的熱電漿氣體流場。為考慮電漿火炬反應器內部全氟化物的裂解反應，本計畫運用全氟化物裂解行為的化學反應機制建立物種傳輸方程式，以描述不同中性物種在流場中的傳輸行為，得以計算全氟化物裂解後不同物種的濃度分布。基於上述的熱電漿與化學反應數學模型，獲得電漿火炬反應器流場全氟化物裂解反應的數值模型，應用於分析非傳輸型井式電漿火炬反應器流場特性，了解電漿工作參數與對於全氟化物裂解效率的影響，以及提供電漿火炬反應器最佳化設計的依據。<br> Abstract: Based on an assumption of thermal plasma being optically thin and electrically neutral, as well as a steady and axisymmetric flow, this project develops a numerical model to simulate the flow field of a plasma torch reactor with taking the induced electrical and magnetic effects into account, where the magneto-hydrodynamic equations, including the continuity equation, the momentum equations, the energy equation, the current continuity equation and the turbulence transport equations are solved with a finite volume discretization in a segregated manner. The thermodynamic and transport coefficients of thermal plasma adopted are presumed in the condition of local thermal equilibrium, whereas a kinetics model is employed to consider the production and destruction of species due to the chemical reactions in a decomposition process. Species transport phenomena arising in the decomposition process are described by the transport equations for different species. The perfluorocarbons decomposition characteristics in a well-type non-transferred plasma troch reactor are analyzed by the proposed numerical model to disclose the influence of working parameters on the decomposition efficiency, as well as to offer suggestions in optimizing the design of the plasma torch reactor targeting the purpose of perfluorocarbons decomposition.電漿火炬全氟化物反應器裂解模擬Plasma torchPerfluorocarbonReactorDecompositionModeling