煤矿通风瓦斯蓄热预热过程研究  

Lean Methane-Air Premixed-Gas Heating Process Research

作　　者：萧琦[1] 邓浩鑫[1] 吕元[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

出　　处：《采矿与安全工程学报》2012年第2期295-300,共6页Journal of Mining & Safety Engineering

基　　金：中国科学院知识创新工程“十一五”重要方向项目(KGGX2-YW-323)

摘　　要：煤矿通风瓦斯蓄热氧化装置中存在低于爆炸极限下限体积分数25%的甲烷/空气预混气体在高温预热条件下的甲烷氧化放热现象。为了揭示不同体积分数甲烷的氧化放热效应对预混气体预热过程的影响,借助FLUENT软件对预混气体预热过程进行了数值模拟,研究了非稳态流场中化学反应对预热温度的影响。结果表明:甲烷体积分数高于0.2%,预热温度高于900℃时,甲烷的氧化放热效应使预混气体预热温度明显高于空气的预热温度和蓄热材料表面温度,甲烷体积分数提高后预混气体的预热长度减小、蓄热氧化装置中蓄热材料的使用量明显减少,数值模拟结果与实验结果基本吻合。The methane oxidation and heat release phenomenon had been found in low concentration methane/air premixed gas（methane concentration is lower than 25% low explosive lever） preheating process in coal mine ventilation air methane regenerative oxidizer.How different concentrations of methane oxidation and heat release effect on premixed gas preheating process were investigated in this paper.The FLUENT software was used for numerical simulation of premixed gas preheating process with unsteady flow field and chemical reaction.The results show that premixed gas preheating tem-perature is obviously higher than air preheating temperature and surface temperature of regenerative ce-ramic because of methane oxidation and heat release when methane concentration is higher than 0.2% and preheating temperature is higher than 900℃.When methane concentration of premixed gas in-creases,the preheating length of premixed gas and quantity of regenerative ceramic decrease at the same time.The numerical simulation results and the experimental results agree well with each other.

关 键 词：通风瓦斯 低体积分数预混气体 数值模拟 化学反应 传热 

分 类 号：TF066.1[冶金工程—冶金物理化学]