Sensitivity Analysis of Heat Transfer Tube Plug Structure of Steam Generator
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摘要: 核电厂蒸汽发生器（SG）传热管堵头是维修传热管常用的部件，采用二维轴对称模型弹塑性分析对堵头封堵过程进行模拟，研究拉伸距离、胀块与堵头摩擦系数、堵头内壁斜度与胀块斜度、牙宽、牙高、槽宽以及胀块长共7个参数对封堵过程中拉杆力、胀块接触力以及牙最大接触力的影响，并分别进行了敏感性分析，得出单个参数敏感性变化预测公式，建立了所有敏感性参数对堵头封堵过程的敏感性影响工程估算式。研究结果可为SG传热管堵头结构设计提供参考。
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关键词:
- 蒸汽发生器（SG） /
- 传热管堵头 /
- 敏感性参数 /
- 有限元分析法（FEM） /
- 预测公式
Abstract: The heat transfer tube plug of steam generator (SG) in nuclear power plant is a common component to maintain the heat transfer tube. Two-dimensional axisymmetric model elastic-plastic analysis was used to simulate the plugging process. The influence and sensitivity analysis of seven parameters (stretching distance, friction coefficient between expander and plug, inclination of plug inner wall and expansion block, tooth width, tooth height, groove width, and expander length) on the tension rod force, expansion block contact force and maximum contact force during plugging process were studied, and the prediction formula for the sensitivity change of each parameter to the plugging process was obtained. The sensitivity effect engineering estimation formula of all sensitivity parameters on the plug plugging process was established. The research results can provide reference for the structural design of SG heat transfer tube plug. -
图 1 SG 传热管堵头结构有限元几何模型示意图
Figure 1. Schematic Diagram of Finite Element Geometric Model of SG Heat Transfer Tube Plug Structure
图 3 拉杆力随胀块位移的线性化处理
Figure 3. Linearization Treatment of Tension Rod Force with Displacement of Expansion Block
图 4 胀块接触力随胀块位移的线性化处理
Figure 4. Linearization Treatment of Expansion Block Contact Force with Expansion Block Displacement
图 6 摩擦系数变化敏感性分析及拟合预测曲线
Figure 6. Sensitivity Analysis of Friction Coefficient Change and Fitting Prediction Curve
图 7 堵头内壁与胀块斜度变化敏感性分析及拟合预测曲线
Figure 7. Sensitivity Analysis of Plug Inner Wall Slope and Expansion Block Slope Change and Fitting Prediction Curve
图 8 牙宽变化敏感性分析及拟合预测曲线
Figure 8. Sensitivity Analysis of Tooth Width Variation and Fitting Prediction Curve
图 9 牙高变化敏感性分析及拟合预测曲线
Figure 9. Sensitivity Analysis of Tooth Height Variation and Fitting Prediction Curve
图 10 槽宽变化敏感性分析及拟合预测曲线
Figure 10. Sensitivity Analysis of Groove Width Variation and Fitting Prediction Curve
图 11 胀块长变化敏感性分析及拟合预测曲线
Figure 11. Sensitivity Analysis of Expansion Block Length Variation and Fitting Prediction Curve
表 1 材料机械性能参数
Table 1. Material Mechanical Properties
部件 材料 抗拉强度σb/MPa 屈服强度σs/MPa 弹性模量E/GPa 伸长率δ/% 泊松比v 胀块、拉杆 ASTM A564-2019 TYPE XM-16 1620 1515 203 8 0.3 堵头、传热管 690合金 586 276 208 30 0.31 管板 SA-508 Gr.3 Cl.2 621 448 191 16 0.3 
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表 2 敏感性分析参数
Table 2. Sensitivity Analysis Parameters
参数名称 变化量 拉伸位移x/mm 10 15 20 胀块与堵头f 0.04 0.1 0.2 0.3 0.4 堵头内壁与胀块斜度o 5° 6° 7° 8° 9° 牙宽a/mm 1.1 1.2 1.27 1.4 1.5 牙高d/mm 14.9 15.04 15.1 15.2 15.3 槽宽c/mm 3.1 3.2 3.3 3.4 3.5 胀块长b/mm 14 16 17 20
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