摘要
为解决再热器超温爆管问题,采用标准kε-方程的湍流模型进行数值模拟,得到了有支管和无支管的再热器带"三通"集箱内的速度矢量和静压分布.在此基础上编写了较为通用的电站锅炉受热面热偏差计算程序,并应用该程序计算了2个不同结构再热器的屏间热偏差.结果表明:为了减少受热面因热偏差过大而发生超温爆管的情况,应在设计时尽量使管屏(子)避开集箱"三通"涡流区,或者将集箱"三通"避开烟温高峰区布置.此热偏差计算程序可以用于不同容量机组的多种结构和类型的受热面热偏差计算,适用于集箱轴向、径向引入引出的布置方式,可用于大型电站锅炉过热器及再热器的优化设计.
To overcome the tube burst failures frequently occurring in boiler reheater due to overheating troubles,numerical simulation was carried out using k-ε turbulent model,during which the velocity vector and static pressure distribution were obtained for T-joint headers with or without branch pipes,hence a relatively universal program for thermal deviation calculation was programmed,with which thermal deviation was calculated for panels of reheaters in 2 different structures.Results show that the tube burst failure caused by large thermal deviation may be avoided at design stage by arranging relevant tube panels far away from T-joint turbulent zone,or arranging the T-joint far away from peak temperature area of flue gas.The program may be used to calculate heat surface thermal deviation for power units of different capacities,structures and types,for headers in axial/radial inlet/outlet arrangement,and for optimized design of boiler superheater and reheater in large power units.
出处
《动力工程学报》
CAS
CSCD
北大核心
2011年第6期403-409,共7页
Journal of Chinese Society of Power Engineering
关键词
电站锅炉
再热器
带三通集箱
静压分布
流量偏差
热偏差
power plant boiler
reheater
T-joint header
static-pressure distribution
flow rate deviation
thermal deviation
