600 MW超临界前后对冲锅炉燃烧特性数值模拟研究  

Numerical Simulation Study on Combustion Characteristics for 600 MW Supercritical Front and Rear Hedge Boiler

作　　者：覃跃 李德波 覃吴[1] 阚伟民[3] 余冯坚 金凤雏 QIN Yue;LI Debo;QIN Wu;KAN Weimin;YU Fengjian;JIN Fengchu(Department of New Energy,North China Electric Power University,Beijing 102206,China;China Southern Grid Power Technology Co.,Ltd.,Guangzhou 510080,China;China Southern Power Grid Co.,Ltd.,Guangzhou 510663,China;Guangdong Energy Conservation Center,Guangzhou 510030,China)

机构地区：[1]华北电力大学新能源学院,北京102206 [2]南方电网电力科技股份有限公司,广东广州510080 [3]中国南方电网有限责任公司,广东广州510663 [4]广东省节能中心,广东广州510030

出　　处：《湖南电力》2024年第6期46-54,共9页Hunan Electric Power

基　　金：国家自然科学基金重点项目(51376161);中国南方电网有限责任公司重点项目(NYJS2020KJ005)。

摘　　要：为了研究旋流燃烧器在不同风量配比下的传热特性,基于CFD技术对某电厂600 MW超临界前后对冲锅炉进行模拟计算,从而得到不同风量下的冷态动力场、热态温度场及组分分布,并对所得数据进行处理分析。结果表明,中心风风速小于6 m/s时,中心风刚性较差,流场平均速度较低,无法抵抗回流的高温烟气;中心风风速大于8 m/s时则易造成回流区紊乱,影响动力场的均匀稳定。中心风增大5 m/s会使着火点位置延后约6%,同时煤粉点燃的最高温度升高约34%。这是由于中心风的刚性在不断增强,从而引导烟气回流区汇聚并形成高速气流场,快速引燃风粉混合物实现充分燃烧。In order to study the heat transfer characteristics of swirl burners under different air volume ratios,a 600 MW supercritical front and rear hedgeboiler in a power plant is simulated and calculated based on CFD technology,so as to obtain the cold state power field,hot state temperature field and component distribution under different air volumes,and the obtained data are processed and analyzed.The results show that when the central wind speed is less than 6 m/s,the central wind rigidity is poor,the average flow field velocity is low,and it cannot resist the return of high temperature flue gas.When the central wind speed is more than 8 m/s,it is easy to cause turbulence in the backflow zone,affecting the uniformity and stability of the power field.If the center wind increases 5 m/s the ignition point position will be postponed by about 6%,while the maximum temperature of coal powder ignition increases by about 34%.This is because the rigidity of the central wind is constantly increasing,thereby guiding the flue gas recirculation area to converge and form a high⁃speed airflow field,and quickly igniting the air⁃powder mixture to achieve full combustion.

关 键 词：旋流燃烧器 传热特性 中心风 对冲锅炉 数值模拟 

分 类 号：TK223.23[动力工程及工程热物理—动力机械及工程]