焊接工艺对1000 MW超临界锅炉水冷壁鳍片温度分布的影响  

Effect of Welding Method on Water Wall Tube Temperature Distribution of 1000 MW Ultra-Supercritical Boiler

作　　者：汪华剑[1] 梁学东[2] 任锐[3] 时标 李斌[2] 熊伟[3] 蒋金忠 曹海涛[1] 

机构地区：[1]西安热工研究院有限公司,陕西西安710032 [2]华能南京金陵发电有限公司,江苏南京210034 [3]华能玉环电厂,江苏台州317604

出　　处：《铸造技术》2017年第5期1166-1170,共5页Foundry Technology

摘　　要：为研究水冷壁管单面焊接的危害,以某1 000 MW超超临界锅炉水冷壁管为研究对象,采用有限元数值模拟技术,分双面焊接、向火侧未焊接、背火侧未焊接3种典型情况,建立水冷壁管的三维有限元模型,并分正常传热和传热恶化两种工况,计算水冷壁管的温度分布情况。结果表明,单面焊接对水冷壁管鳍片中心温度影响较大,对水冷壁管顶点的温度影响相对较小。向火侧未焊接对温度场分布的影响大于背火侧未焊接。向火侧未焊接情况下,算例显示,传热恶化时,鳍片中点温度比正常焊接时的温度高8.8%,更容易被破坏。In order to study the detriment of one side welding on water cool tube wall, 1 000 MW ultra-supercritical pressure boiler was taken as an example, three typical welding shapes which were normal welding, fire side unweld and back side unweld were built with 3D FEM model. Temperature distributions of the three models were computed in situation of normal heat transfer and deteriorated heat transfer. The results show that one side welding has less effect on temperature of tube fire side apex, but more effect on temperature distribution of fin. The effect of fire side no-welding on temperature distribution is more serious than that of back side no-welding. The calculation example show that in case of fire side no-welding, when heat transfer deteriorates, the fin middle temperature is 8.8% higher than that of normal welding,and is easier to failure.

关 键 词：水冷壁管 单面焊接 温度分布 有限元 

分 类 号：TG44[金属学及工艺—焊接] TM621.2[电气工程—电力系统及自动化]