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    杨梦如, 仇鹏, 许建良, 代正华, 王辅臣. 不同稀释剂条件下甲烷非催化部分氧化数值模拟[J]. 华东理工大学学报(自然科学版), 2023, 49(4): 457-464. DOI: 10.14135/j.cnki.1006-3080.20220430001
    引用本文: 杨梦如, 仇鹏, 许建良, 代正华, 王辅臣. 不同稀释剂条件下甲烷非催化部分氧化数值模拟[J]. 华东理工大学学报(自然科学版), 2023, 49(4): 457-464. DOI: 10.14135/j.cnki.1006-3080.20220430001
    YANG Mengru, QIU Peng, XU Jianliang, DAI Zhenghua, WANG Fuchen. Numerical Simulation of Non-Catalytic Partial Oxidation of Methane Based on Different Diluents[J]. Journal of East China University of Science and Technology, 2023, 49(4): 457-464. DOI: 10.14135/j.cnki.1006-3080.20220430001
    Citation: YANG Mengru, QIU Peng, XU Jianliang, DAI Zhenghua, WANG Fuchen. Numerical Simulation of Non-Catalytic Partial Oxidation of Methane Based on Different Diluents[J]. Journal of East China University of Science and Technology, 2023, 49(4): 457-464. DOI: 10.14135/j.cnki.1006-3080.20220430001

    不同稀释剂条件下甲烷非催化部分氧化数值模拟

    Numerical Simulation of Non-Catalytic Partial Oxidation of Methane Based on Different Diluents

    • 摘要: 以工业装置中O2与CH4体积比为0.69的操作条件为基础,使用ANSYS Fluent16.1进行数值模拟,采用基于雷诺平均方程(RANS) 的 Realizable k-ε 湍流模型,以及涡耗散概念 (EDC) 模型耦合GRI3.0 详细化学反应机理来模拟转化炉内湍流燃烧与化学反应过程。考察了3种稀释剂(N2、H2O、CO2)对转化炉内温度、自由基(·OH、·CH2O)分布以及炉膛火焰反应区分布的影响。结果表明:N2和H2O稀释对转化炉内温度、自由基及反应区分布的影响差别很小,CO2稀释的影响最显著。在CO2稀释下,炉膛内的最高火焰温度降低了约50 K;·OH和·CH2O自由基峰值分别降低了约33.0%和24.5%。此外,CO2稀释的3种不同效应对转化炉内温度和自由基分布的影响大小依次为:稀释效应>热效应>化学效应。

       

      Abstract: The high temperature flame in the reformer of non-catalytic partial oxidation (NC-POX) of methane under pure oxygen atmosphere will affect the safe and stable operation of the actual industrial plant. Adding diluent to dilute pure oxygen in the reaction system can improve the temperature distribution and flame structure of the reformer. The volume ratio of O2 to CH4 0.69 was typically used when NC-POX reformers were used industrially. Numerical modelling was conducted using ANSYS Fluent 16.1 commercial simulation software, with a realizable k-ε turbulence model considered for Reynolds-averaged Navier-Stokes (RANS) model. The Eddy Dissipation Concept (EDC) model coupled with GRI3.0 chemical reaction mechanism was suitable for simulating turbulent combustion and chemical reaction processes in the reformer. This study investigated the effect of three diluent (N2, CO2, H2O) on the distribution of temperature, radicals (·OH、·CH2O) and flame reaction zone. The results indicated that effects of N2 and H2O dilution on the temperature, radicals and flame reaction zone distribution were basically indistinguishable, and the effect of CO2 dilution was the most significant. The increasing of CO2 content decreased the peak temperature by about 50 K and peak values of ·OH and ·CH2O radicals decreased by about 33.0% and 24.5%, respectively. In addition, three effects of CO2 dilution on the temperature and radicals distribution in the reformer were in the order of dilution effect > thermal effect > chemical effect.

       

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