CH_4/N_2、CH_4/CO_2二元和CH_4/N_2/CO_2三元混合气体爆炸极限的实验与估算  

Measurement and estimation for the flammability limits of binary mixtures of CH_4/N_2,CH_4/CO_2 and ternary mixtures of CH_4/N_2/CO_2

作　　者：孙俊芳[1] 张可[2] 郭保玲[1] 杨小莉[2] 常旭宁 吴江涛[2] 

机构地区：[1]北京市燃气集团有限责任公司,北京100035 [2]西安交通大学热流科学与工程教育部重点实验室,陕西西安710049

出　　处：《爆炸与冲击》2015年第5期747-752,共6页Explosion and Shock Waves

基　　金：国家自然科学基金项目(51276142);北京市科技计划重点资助项目(D12110900040000);江苏省自然科学基金项目(SBK201122327)

摘　　要：为了获取甲烷与不可燃组分组成的混合物的爆炸极限,采用一种基于绝热火焰温度的混合物爆炸极限估算方法,对CH4/N2和CH4/CO2这2种二元混合气体及3种不同阻燃剂体积分数的CH4/N2/CO2三元混合气体的爆炸极限进行实验研究,并将实验结果与估算值进行比较。CH4/N2与CH4/CO2二元混合物实验值与估算值在爆炸上限处的平均绝对偏差为0.34%,在爆炸下限处的平均绝对偏差为0.15%。3种不同比例的三元混合物实验值与估算值在爆炸上限处的平均绝对偏差为0.43%,在爆炸下限处的平均绝对偏差为0.20%。结果表明,估算方法对甲烷与不可燃组分的二元混合物与三元混合物爆炸极限的估算均具有较高的准确度。Flammability limits for the binary mixtures of CH4/N2 and CH4/CO2 were measured, and the ternary mixtures of CH4/N2/CO2 with three different diluent volume ratios were studied. A method based on the adiabatic flame temperature was introduced to estimate the flammability limits of the mixtures, and the experimental results were compared with the estimated values. The average ab- solute deviation between the experimental results and estimated values of the lower flammability limit for the two binary mixtures is 0.15%, and for the upper flammability limit is 0.34%. The average absolute deviation between the experimental results and estimated values of the lower flammability limit for the three ternary mixtures is 0.20%, and for the upper flammability limit is 0.43 %. The results showed that the method is available for estimating the flammability limits of the binary and ternary mixtures of methane with diluent gases.

关 键 词：爆炸力学 爆炸极限 绝热火焰温度 混合气体 CH4 阻燃剂 

分 类 号：O381[理学—流体力学]