空气掺混CO2对CH4燃烧特性影响  

Effect of blending CO2 into air on combustion characteristics of CH4

作　　者：张高强 张天清 付忠广[1] 宋家胜 高玉才 ZHANG Gaoqiang;ZHANG Tianqing;FU Zhongguang;SONG Jiasheng;GAO Yucai(Key Laboratory of Condition Monitoring and Control for Power Plant Equipment,Ministry of Education,North China Electric Power University,Beijing 102206,China;Key Laboratory of Low-grade Energy Utilization Technologies&Systems,Ministry of Education,Chongqing University,Chongqing 400044,China)

机构地区：[1]华北电力大学电站设备状态检测与控制教育部重点实验室,北京102206 [2]重庆大学低品位能源利用技术及系统教育部重点实验室,重庆400044

出　　处：《热力发电》2020年第7期61-68,共8页Thermal Power Generation

基　　金：中央高校基本科研业务专项资金资助(2018QN035)。

摘　　要：采用数值模拟对空气掺混CO2后与CH4的燃烧特性进行了研究,分析不同CO2掺混率对燃烧室温度场、速度场及污染物NOx排放的影响。结果表明:提高CO2掺混率,燃烧室高温区面积减少,最高温度降低,出口温度也逐渐下降;燃烧室回流区面积减小,不同径向截面处的轴向速度峰谷差降低,平均轴向速度逐渐下降。综合空气掺混CO2后与CH4完全燃烧的流场特性,认为该燃烧室模型对应的最佳CO2掺混率为10%。The combustion characteristics of CH4 in atmosphere of air mixed with CO2 were numerically studied.The effects of CO2 mixing ratio on temperature field,velocity field and NOx emission of the combustion chamber were investigated.The result shows that,when the CO2 mixing rate was increased,the high temperature area in the combustion chamber reduced,the maximum temperature declined,and the temperature at outlet of the combustion chamber also decreased gradually.The recirculation area in the combustion chamber reduced,and the difference of axial velocity peaks and valleys at different radial sections reduced.The average axial velocity of the flue gas gradually decreased.By analyzing the flow field characteristics of complete combustion with CH4 after air-mixed CO2,it shows that 10%is the optimum CO2 mixing rate corresponding to the combustion chamber model.

关 键 词：燃烧室 CO2掺混率 CH4 温度场 速度场 燃烧特性 NOX排放 数值模拟 

分 类 号：TK224.11[动力工程及工程热物理—动力机械及工程]