基于铁基载氧体的甲烷化学链燃烧数值模拟  

Numerical simulation of methane chemical looping combustion with Fe-based oxygen carrier

作　　者：王晓佳[1] 金保昇[1] 张勇[1] 殷上轶[1] 钟文琪[1] 宋敏[1] 

机构地区：[1]东南大学能源与环境学院,南京210096

出　　处：《东南大学学报（自然科学版）》2011年第3期584-590,共7页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51076029);国际科技合作资助项目(2010DFA61960)

摘　　要：基于Gibbs自由能最小化原理,建立了以Fe2O3为载氧体的甲烷化学链燃烧模型,研究了流化床燃料反应器内反应物摩尔比、温度以及操作压力对反应产物分布和载氧体反应活性的影响,并揭示了其反应机理.结果表明:当Fe2O3与CH4反应物摩尔比保持在12左右,反应器温度控制在850～900℃范围时,出口处CO2的摩尔分数达到最大值;提高反应器温度降低了载氧体的反应活性;增加反应器操作压力有助于提高载氧体的反应活性,但同时由于促进了CH4的重整反应而导致CO2摩尔分数的降低.A model of chemical-looping combustion of methane with Fe2O3 as oxygen carrier has been established based on the principle of Gibbs free energy minimization.Effects of the mole ratio of reactants,temperature and operation pressure on the distribution of reaction products have been studied,and the reaction mechanism is revealed.Results show that the mole fraction of CO2 reaches the maximum when the mole ratio of reactants remains 12 or so and the temperature of reduction reaction ranges between 850~900℃.As the temperature increases,the reactivity of Fe-based oxygen carrier declines.By increasing the operating pressure,the reactivity of Fe2O3 rises,but the reforming of CH4is also promoted,which results in the decrease of mole fraction of CO2.

关 键 词：化学链燃烧 铁基载氧体 数值模拟 Gibbs自由能最小化 

分 类 号：O614.812[理学—无机化学]