煤矿低浓度瓦斯热氧化中蜂窝陶瓷燃烧流场数值计算  

Numerical calculation of combustion flow field of honeycomb ceramics in coal mine low concentration gas thermal oxidation

作　　者：刘玉航 李希建[1,2] 萧琦 蒋兴法 董未来 陈先勇 谢洪高 LIU Yuhang;LI Xijian;XIAO Qi;JIANG Xingfa;DONG Weilai;CHEN Xianyong;XIE Honggao(College of Mining,Guizhou University,Guiyang 550025,Guizhou Province,China;Engineering Center of Guizhou Province Complex Geological Mining Safety Technology,Guiyang 550025,Guizhou Province,China;Beijing Zhongyuan Bozhi Energy Saving Technology Co.,Ltd.,Beijing 100080,China;Safety Technology Center of Guizhou Coal Mine Safety Supervision Bureau,Guiyang 550081,Guizhou Province,China)

机构地区：[1]贵州大学矿业学院,贵州贵阳550025 [2]贵州省复杂地质矿山开采安全技术工程中心,贵州贵阳550025 [3]北京中源博智节能科技有限公司,北京100080 [4]贵州煤矿安全监察局安全技术中心,贵州贵阳550081

出　　处：《化学工程》2024年第6期70-74,81,共6页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(52164015);贵州省科技计划项目(黔科合支撑[2022]一般231,黔科合支撑[2023]一般148)。

摘　　要：为研究煤矿低浓度瓦斯在蜂窝陶瓷燃烧流场内流动、燃烧、传热反应,借助数值模拟手段,建立了包含周期性条件、甲烷燃烧机理、湍流-层流流动特性的矩形微通道模型,通过对其变参数分析,解析预混气体流速、甲烷体积分数和预混气预热温度变化对蜂窝陶瓷燃烧流场的影响。结果表明:预混气体流速主要影响燃烧流场内的火焰面传播速度和最高火焰温度,速度越大,火焰面前沿的温度梯度越大;甲烷体积分数的降低导致火焰面位置明显后移,火焰面处峰值与化学反应速率明显下降,流场内的温度下降;预混气进气温度提高时,火焰的峰值温度上升,化学反应速率增大。In order to study the dynamics of low-concentration methane combustion within honeycomb ceramic structures in coal mining environments,advanced numerical simulations were employed.A model,integrating periodic boundary conditions,detailed methane combustion processes,and the interplay of turbulent and laminar flows in rectangular microchannels,was developed.The effect of premixed gas velocity,methane volume fraction,and preheating temperature variation on the combustion characteristics in these structures were investigated.The results reveal that the velocity of the premixed gas predominantly influences the rate of flame spread and the maximum temperature reached within the combustion zone,with higher velocities inducing more pronounced temperature gradients at the flame front.Conversely,decreasing the methane volume fraction results in a significant shift of the flame front towards the back,along with a marked reduction in both the peak temperature and chemical reaction rates,leading to cooler overall flow field temperatures.Furthermore,raising the temperature of the incoming premixed gas enhances the peak flame temperature and accelerates the chemical reactions involved.

关 键 词：煤矿瓦斯 蜂窝陶瓷 燃烧流场 数值模拟 

分 类 号：O643.2[理学—物理化学] TF055[理学—化学] TQ038[冶金工程—冶金物理化学]