二甲醚、氨气和甲烷混合燃料的层流预混火焰[火用]损特性研究  

Analysis of Exergy Losses in Laminar Premixed Flames of Dimethyl Ether,Ammonia and Methane Blends

作　　者：孙国军 付忠广[1] 卢茂奇 Sun Guojun;Fu Zhongguang;Lu Maoqi(School of Energy,Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《燃烧科学与技术》2022年第3期271-282,共12页Journal of Combustion Science and Technology

基　　金：北京市自然科学基金资助项目(3162030).

摘　　要：为阐明替代燃料燃烧过程的能质转换特性、探索提高燃烧过程效率的原理,分别对掺混二甲醚(DME)、氨气(NH_(3))的CH_(4)/空气层流预混火焰的[火用]损特性应用热力学第二定律进行分析.结果表明,宽掺混比范围内,NH_(3)的性能要优于DME;热传导源项驱动了总[火用]损率随温度的升高而降低;运行压力的提升有利于降低化学和排气[火用]损率;而随着当量比的上升,总[火用]损率先减小后增大,并在化学计量比附近达到最小值.此外,还构建了多运行参数共同作用下的总[火用]损率响应函数,该函数在较宽的运行范围内得到了良好验证,有望为CH_(4)/DME、CH_(4)/NH_(3)燃料燃烧系统的设计优化与运行提供帮助.To elucidate the energy-mass conversion characteristics during the combustion of alternative fuels and to explore the principle of improving the efficiency of combustion process,the exergy loss characteristics of CH_(4)/air laminar premixed flames blended with dimethylether(DME)and ammonia(NH_(3))were analyzed separately by the second law of thermodynamics.The results show that the performance of NH_(3)is better than that of DME over a wide range of blending ratio;the conduction loss drives the total exergy loss to decrease with increasing temperature;the increase of operating pressure contributes to the reduction of the chemical and exhaust gas exergy loss rates;the total exergy loss rate decreases first and then increases as the equivalent ratio increases,reaching a minimal value near the stoichiometric ratio.In addition,a response surface function for the total exergy loss rate was constructed with a wide range of operating parameters,which is expected to be useful for the design optimiza-tion and operation of CH_(4)/DME and CH_(4)/NH_(3)fuel combustion systems.

关 键 词：[火用]损 层流预混火焰 二甲醚 氨气 化学动力学 

分 类 号：O64[理学—物理化学]