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

作　　者：杨梦如 仇鹏 许建良[1] 代正华[1,2] 王辅臣 YANG Mengru;QIU Peng;XU Jianliang;DAI Zhenghua;WANG Fuchen(Shanghai Engineering Research Center of Coal Gasification,School of Resources and Environmental Engineering,East China University of Science and Technology,Shanghai 200237,China;School of Chemical Engineering,Xinjiang University,Urumqi 830046,China)

机构地区：[1]华东理工大学资源与环境工程学院,上海市煤气化工程技术研究中心,上海200237 [2]新疆大学化工学院,乌鲁木齐830046

出　　处：《华东理工大学学报（自然科学版）》2023年第4期457-464,共8页Journal of East China University of Science and Technology

基　　金：上海科技创新行动计划(21DZ1209003);上海市优秀技术带头人项目(19XD1434800);国家自然科学基金(21776087)。

摘　　要：以工业装置中O_(2)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(N_(2)、H_(2)O、CO_(2))对转化炉内温度、自由基(·OH、·CH_(2)O)分布以及炉膛火焰反应区分布的影响。结果表明:N_(2)和H_(2)O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,CO_(2)稀释的影响最显著。在CO_(2)稀释下,炉膛内的最高火焰温度降低了约50 K;·OH和·CH_(2)O自由基峰值分别降低了约33.0%和24.5%。此外,CO_(2)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。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 O_(2)to CH40.69 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-εturbulence 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(N_(2),CO_(2),H_(2)O)on the distribution of temperature,radicals(·OH、·CH_(2)O)and flame reaction zone.The results indicated that effects of N_(2) and H_(2)O dilution on the temperature,radicals and flame reaction zone distribution were basically indistinguishable,and the effect of CO_(2)dilution was the most significant.The increasing of CO_(2)content decreased the peak temperature by about 50 K and peak values of·OH and·CH_(2)O radicals decreased by about 33.0%and 24.5%,respectively.In addition,three effects of CO_(2)dilution on the temperature and radicals distribution in the reformer were in the order of dilution effect>thermal effect>chemical effect.

关 键 词：非催化部分氧化 稀释剂 CO_(2)稀释 火焰温度 化学效应 

分 类 号：TE646[石油与天然气工程—油气加工工程]