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.
出处
《铸造技术》
北大核心
2017年第5期1166-1170,共5页
Foundry Technology
关键词
水冷壁管
单面焊接
温度分布
有限元
water cool wall tube
one side welding
temperature distribution
finite element method（FEM）
