摘要
为了探究液体燃料的中低氧稀释(moderate and intense low-oxygen dilution,MILD)燃烧的特性,采用数值模拟方法,分析了MILD燃烧过程中空气与燃料的入口条件对燃烧室烟气回流比、流场结构和污染物排放量的影响规律.研究结果表明:MILD燃烧室内流场结构对燃料与空气的混合起到决定作用;随着当量比的增加,燃烧室温度逐渐升高,CO的排放量逐渐增大,NO_(x)排放量也随之增大,当量比为0.9时,NO_(x)排放量达到峰值;随着空气入口速度的增加,燃烧室中心面温度分布均匀,没有明显的局部高温峰值点,NO_(x)排放量逐渐减小,CO排放量呈先减小、后增大的趋势,空气入口速度为110 m/s时的CO排放量最小;随着燃料入口速度的增大,燃烧室内峰值温度逐渐升高,NO_(x)排放量逐渐增加,CO排放量呈先减小、后增大的趋势.
To explore the combustion characteristics of liquid fuel moderate and intense low-oxygen dilution(MILD)combustion,the MILD combustion process was investigated by numerical simulation,and the effects of air and fuel inlet conditions on flue gas reflux ratio,flow field and pollutant emission were analyzed in detail.The results show that the flow field structure in MILD combustion chamber plays a decisive role in fuel air mixing.With the increasing of equivalence ratio,the combustion chamber temperature is increased accordingly with increased CO emission,and the NO_(x)emission is also increased.When the equivalence ratio is 0.9,the emission of NO_(x)reaches a peak value.With the increasing of air inlet velocity,the temperature distribution on the central surface of the combustion chamber is uniform without obvious local high-temperature peak point,and the NO_(x)emission is decreased,while the CO emission is decreased with latter increasing.The emission of CO is the lowest when the air inlet velocity is 110 m/s.With the increasing of fuel inlet velocity,the peak temperature in the combustion chamber is increased with increased NO_(x)emission,and the CO emission is decreased with latter increasing.
作者
杜敏
王跃成
张帅平
范冬辉
DU Min;WANG Yuecheng;ZHANG Shuaiping;FAN Donghui(School of Energy and Power Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China)
出处
《江苏大学学报（自然科学版）》
CAS
北大核心
2023年第5期582-587,共6页
Journal of Jiangsu University：Natural Science Edition
基金
国家自然科学基金资助项目(51306075)
江苏大学高级人才专项资金资助项目(11JDG152)。
