配风方式对花瓣燃烧器出口流场影响的研究  

Effect of Air Distribution Mode on Exit Flow Field of Petal Burners

作　　者：李慧君[1] 贾宝桐 

机构地区：[1]华北电力大学能源动力与机械工程学院,河北保定071003

出　　处：《动力工程学报》2015年第5期348-353,共6页Journal of Chinese Society of Power Engineering

摘　　要：建立了花瓣燃烧器的物理模型,采用Fluent软件对不同一、二次风速度时花瓣燃烧器冷态下的流场进行了计算,分析了一、二次风配风方式对此种燃烧器出口流场的影响.结果表明:一次风的存在使回流区减小,稳燃能力降低,但能调整回流区与燃烧器出口的距离,避免了结渣等问题的发生;当一次风速度一定时,增大内二次风合速度,轴向回流区变大,能改善燃烧效果;调整内二次风叶片角度,增大内二次风切向速度,径向回流区变小,轴向回流区增大;针对不同的煤种,需选择适当的一、二次风速度,增大轴向或径向回流区以提高稳燃能力.A physical model of petal burner was set up,of which the cold-state flow field was calculated using software Fluent at different primary and secondary air velocities,so as to analyze the distribution mode of primary and secondary air on the exit flow field.Results show that the existance of primary air reduces the recirculation zone,lowers the combustion stability,but helps to avoid the slagging problem due to its capability in adjusting the distance between recirculation zone and burner exit.At a certain velocity of primary air,with the rise of internal secondary air velocity,the axial recirculation zone increases and the combustion effect improves.By adjusting the blade angle to increase the tangential velocity of internal secondary air,the radial recirculation zone will be reduced,but the axial recirculation zone will be increased.For different coal categories,the combustion stability can be raised by appropriately choosing the velocity of primary and secondary air to increase both the axial and radial recirculation zone.

关 键 词：花瓣燃烧器 配风方式 流场 数值模拟 

分 类 号：TM621.2[电气工程—电力系统及自动化]