通风瓦斯蓄热式热氧化过程数值模拟  

Simulation on regenerative thermal oxidation of ventilation air methane

作　　者：邓浩鑫[1,2] 吕元[1,2] 萧琦[1] 肖云汉[1] 

机构地区：[1]中国科学院先进能源动力重点实验室(工程热物理研究所),北京100190 [2]中国科学院研究生院,北京100190

出　　处：《煤炭学报》2012年第8期1332-1336,共5页Journal of China Coal Society

基　　金：中国科学院知识创新工程重要方向资助项目(KGGX2-YW-323)

摘　　要：为模拟通风瓦斯蓄热氧化过程的工作特性,并在此基础上优化关键性参数,建立了包含周期性边界条件和甲烷单步氧化反应机理的单通道均相反应模型,模拟实验室尺度下的以蜂窝蓄热体作为换热介质的蓄热式热氧化过程。用计算流体力学方法计算获得通风瓦斯蓄热式热氧化过程中气体流量、甲烷浓度对装置工作特性的影响。计算结果表明,单侧0.3 m长度的蓄热体,30 s的切换周期,可以满足一定范围内的通风瓦斯氧化需求。模拟给出了稳定和非稳定状态下沿流向的温度分布,可以发现温度分布从启动状态的抛物型温度场,经过上百个切换周期过渡到稳定的梯形温度场,实现自维持运行。In order to simulate the performance of the thermal oxidation process and optimize the essential parameters, a simplified single channel homogeneous combustion model with periodic boundary conditions and one step methane/ air reaction mechanism was proposed for a regenerative thermal oxidizer on laboratory-scale. The basic performance of regenerative thermal oxidation of ventilation air methane were calculated by the computational fluid dynamics （CFD） without a pilot stage. The results show that a ceramic bed of 0.3 m in length at one side is sufficient to operate proper- ly at these conditions. Distributions of temperature on steady and unsteady state condition were respectively simulated by computational fluid dynamics. The initial parabolic temperature distribution gradually evolved into a typical trape- zoidal distribution of temperature field after hundreds of switching cycles.

关 键 词：蓄热式热氧化 通风瓦斯 计算流体力学 

分 类 号：TD712.6[矿业工程—矿井通风与安全]