某1000MW超超临界双切圆锅炉燃烧特性的数值模拟与优化  

Numerical Simulation and Optimization on Combustion of a 1 000 MW Ultra Supercritical Dual Tangential Circle Boiler

作　　者：刘建全[1] 孙保民[1] 胡永生[1] 李前宇[2] 白涛[1] 

机构地区：[1]电站设备状态检测与控制教育部重点实验室(华北电力大学),北京市昌平区102206 [2]华北电力科学研究院有限责任公司,北京市西城区100009

出　　处：《中国电机工程学报》2012年第20期34-41,136,共8页Proceedings of the CSEE

摘　　要：使用realizable k-ε双方程模型,对一台1000MW超超临界机组双切圆锅炉的燃烧特性进行了数值模拟,研究了一、二次风速及喷口结构对锅炉热态流场、温度场分布的影响,对燃烧器原始结构及拟改进结构流场及温度场进行了比较。数值模拟结果表明:燃烧器拟改进结构情况燃烧过程中,炉膛内形成2个旋向相反的椭圆形温度场与流场。一、二次风速对炉内燃烧器区域热态流场影响较大,一次风速增大,切圆直径变小;二次风速增大,切圆直径变大。燃烧器喷口形状与布置方式不同时,炉内温度场变化较大。增大一次风喷口尺寸能够增加火焰刚性,可避免一次风速较低时火焰偏斜贴壁,为最佳改进方案。并与改进后试验结果进行了对比,获得了比较一致的结果。为PM型燃烧器设计和运行提供了一定的理论基础。The combustion process of a 1 000 MW ultra supercritical dual tangential circle boiler was numerically studied with Realizable k-ε model.The influence of the primary and secondary air velocity and nozzle structure on the distributions of thermal flow and temperature field inside the boiler was studied.The flow and temperature field with the burners of being improved structure were compared with the original ones.The numerical simulation results show as follows： The oppositely-rotary oval temperature field and flow field form respectively in the furnace,the primary and secondary air velocity have a great impact on the thermal flow within the burner’s combustion area.Diameter of the tangent circle decreases with the increasing of primary air velocity but increases with the increasing of secondary air velocity.The nozzles shape and layout of the burner can change the temperature field in the furnace largely.Increasing the dimension of the primary air nozzle can increase the rigidity of the flame,and avoid the flame inclination to the wall at low primary air velocity.Thus,it is the best improvement solution.The simulation results are consistent with the results of the field test with improvement.This study provides some theoretical basis for the PM type burners’ design and operation

关 键 词：燃烧器结构 一、二次风速 双切圆 可实现k-ε模型 数值计算 

分 类 号：TM223[一般工业技术—材料科学与工程]