CO2和N2惰化条件下合成气可燃下限实验研究  

Experimental Study on Lower Flammability Limits of CO2/N2 Diluted Syngas

作　　者：尚融雪[1] 万嵩 杨红霞[1] 李刚[1] SHANG Rong-xue;WAN Song;YANG Hong-xia;LI Gang(School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, China)

机构地区：[1]东北大学资源与土木工程学院

出　　处：《东北大学学报（自然科学版）》2019年第8期1191-1196,共6页Journal of Northeastern University(Natural Science)

基　　金：国家重点研发计划项目(2017YFC0804703);国家自然科学基金资助项目(51804065);中国博士后科学基金资助项目(2018M631811);中央高校基本科研业务费专项资金资助项目(N170103007)

摘　　要：利用自主搭建的可燃极限实验系统,对含有CO2和N2的合成气可燃下限进行实验研究,并对Le Chatelier公式进行校核.结果表明,合成气可燃下限随含氢量的增加而降低,由于反应控制机理的影响效应,少量氢气的加入对混合物可燃下限具有显著影响;合成气可燃下限随N2和CO2比例的增加近似线性升高,而CO2较强的热效应及化学效应使其对混合物可燃下限的影响更显著;由于Le Chatelier在推导过程中对化学反应作用的简化及忽视,使其对含氢量较低及惰化比例较高的合成气可燃下限的预测准确性较差,且计算结果不能区分不同惰性气体对合成气可燃下限的影响差异.The lower flammability limits of syngas/air mixtures with CO 2 and N 2 inert dilution were experimentally studied under atmospheric conditions via a self-developed closed cylindrical stainless steel vessel. The experimental data were used to validate the performance of the Le Chatelier’s Rule. The experimental results showed that, the lower flammability limit of fuels mixtures decreases with the increase of H 2 fraction. A small amount of H 2 in the fuels presents the significant effect on the lower flammability limit of mixtures due to the variation of the controlled mechanism of the reaction. The lower flammability limits of mixtures almost linearly increases with an increase in inert dilution ratio. CO 2 has a stronger inert effect than N 2 due to CO 2’s stronger thermal and chemical kinetic effect in reducing the flame temperature and radical concentrations. The prediction by Le Chatelier’s Rule has great discrepancy against the experimental results when H 2 fraction is small or with the high presence of inert species in the mixture. Moreover, the different inter effect between CO 2 and N 2 on the lower flammability limit cannot be calculated using Le Chatelier’s Rule.

关 键 词：合成气 可燃下限 含氢量 CO2/N2稀释 LE Chatelier公式 

分 类 号：TQ086[化学工程]