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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 damage of one-sided welding of water-cooled wall tubes, a 1 000 MW ultra-supercritical boiler water-cooled wall tube was used as the research object. Finite element numerical simulation was used to simulate the welding of single- Three typical cases, the establishment of three-dimensional finite element model of water wall tube, and divided into two normal conditions of heat transfer and heat transfer, water temperature calculation of the wall temperature distribution. The results show that the single-side welding has a great influence on the center temperature of the fin of the water-cooled wall tube, and has a relatively small influence on the temperature of the top of the water-wall tube. The effect of unwelded to the fireside on the temperature field is greater than on the unburned side of the fireside. In the case of no welding to the fireside, the example shows that the fin midpoint temperature is 8.8% higher than the normal welding temperature when the heat transfer is deteriorated and is more likely to be destroyed.