抽水蓄能电站压力钢管焊缝应力测试与评价分析

发布时间：2018-04-03 22:02

本文选题：压力钢管　切入点：应力分析　出处：《人民长江》2017年17期

【摘要】：为确保抽水蓄能电站机组通流部件的稳定运行,对球阀与压力钢管连接位置处焊缝应力进行了测试,利用球阀全开导叶全关时的静水压力对应力测点进行标定,进而获得了甩负荷情况下焊缝位置处的应力变化特征。数据分析结果表明:焊缝处各测点环向应力与球阀前压力呈正相关,相关系数大于0.94;焊缝处顺水流方向应力与压力呈负相关,相关系数小于-0.85;稳态发电工况及甩负荷过程中应力测点中存在明显的动静干涉频率成分;受水锤影响,最大应力变化产生于甩满负荷工况;最大应力值分析表明,压力钢管可以长期安全稳态的运行。
[Abstract]:In order to ensure the steady operation of the flow passage parts of the pumped storage power station, the stress of the weld at the connection position between the ball valve and the penstock is measured, and the stress measurement points are calibrated by the hydrostatic pressure of the ball valve when the full open vane is closed.The stress variation characteristics of the weld under load rejection are obtained.The results of data analysis show that the circumferential stress at the weld is positively correlated with the pressure in front of the ball valve, and the correlation coefficient is greater than 0.94.The stress in the direction of water flow in the weld is negatively correlated with the pressure.The correlation coefficient is less than -0.85; there are obvious static and static interference frequency components in the stress measurement points during steady power generation and load rejection; under the influence of water hammer, the maximum stress changes occur in the condition of full load rejection, and the maximum stress value analysis shows that,The pressure steel pipe can be operated safely and steadily for a long time.
【作者单位】：国网新源控股有限公司技术中心;华电郑州机械设计研究院有限公司;中国水利水电科学研究院;
【基金】：国家自然科学基金项目(51309258) 国家电网公司科技项目(52573016001G,52573016001J)
【分类号】：TV732.4;TV743

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