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Probable causes of damage of heat-exchange tubes of low-pressure-exchanges of PND-3 type and repair methods

机译：PND-3型低压交换热交换管损坏的可能原因及修复方法

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摘要

The structures of low-pressure heaters (LPH), which are installed at nuclear power plants with the K-1000-60/1500 type turbine plants are considered. It was revealed that only the PND-3 type low-pressure heaters have the damages of the heat exchange tubes. For a short operation life, the number of the damaged heat-exchange tubes of PND-3 is approximately 50 pcs for Kalinin NPP and 100-150 pcs for Balakovo NPP. The low-pressure heaters were manufactured at AO Ural Plant of Chemical Machine-Building “Uralkhimmash,” OAO Taganrog Boiler-Making Works “Krasny Kotelshchik,” and Vitkovice Machinery Group, but the damage nature of the heat-exchange tubes is identical for all PND-3. The damages occur in the place of passage of the heat exchange tubes through the first, the second, and the third partitions over the lower tube plate (the first path of the turbine condensate). Hydraulic shocks can be one of the possible causes of the damage of the heat-exchange tubes of PND-3. The analysis of the average thermal and dynamic loads of the tube systems of PND-1-PND-4 revealed that PND-3 by the thermal power are loaded 1.4-1.6 times and by the dynamic effects are loaded 1.8-2.0 times more than the remaining LPHs. Another possible cause of damage can be the cascaded drain of the separate into PND-4 and then through the drainage heat exchange into PND-3. An additional factor can be the structure of the condensate drainage unit. The advanced system of the heating steam flow and pumping scheme of the separate drain using the existing drainage pumps of PND-3 for K-1000-60/1500 turbine plants for Balakovo and Kalinin NPPs were proposed. The considered decisions make it possible to reduce the flow rate of the heating steam condensate from PND-3 into PND-4 and the speed of the heating steam in the tube space of PND-3 and eliminate the occurrence of hydraulic shocks and damages of the heat exchanger tubes.
机译：考虑了与K-1000-60 / 1500型涡轮机一起安装在核电站中的低压加热器（LPH）的结构。结果表明，只有PND-3型低压加热器具有热交换管的损坏。对于较短的使用寿命，对于Kalinin NPP，PND-3损坏的热交换管数量大约为50个，对于Balakovo NPP，该数量大约为100-150。低压加热器是在AO乌拉尔化学机械制造厂“ Uralkhimmash”，OAO塔甘罗格锅炉制造厂“ Krasny Kotelshchik”和Vitkovice机械集团制造的，但是热交换管的损坏本质对所有人都是相同的PND-3。损坏发生在热交换管穿过下管板上方的第一，第二和第三隔板（涡轮冷凝器的第一路径）的位置。液压冲击可能是PND-3换热管损坏的可能原因之一。对PND-1-PND-4管道系统的平均热负荷和动态负荷进行分析后发现，PND-3的火力负荷是PND-1-PND-4的1.4-1.6倍，而动力效应的负荷是1.8-2.0倍。剩余的LPH。造成损坏的另一个可能原因是，分离器的级联排放进入PND-4，然后通过排放热交换进入PND-3。另一个因素可能是冷凝水排放单元的结构。提出了一种先进的加热蒸汽流量和单独排水的泵送方案，该系统使用现有的PND-3排水泵（用于Balakovo和Kalinin核电厂的K-1000-60 / 1500涡轮机）。经过深思熟虑的决策可以降低从PND-3进入PND-4的加热蒸汽冷凝物的流量，并降低PND-3的管腔内加热蒸汽的速度，并消除水力冲击和损坏。换热器管。

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  • 来源
    《Thermal engineering》 |2017年第8期|568-573|共6页
  • 作者

    Trifonov Nikolay N.; Esin S. B.; Nikolaenkova E. K.; Sukhorukov Yu G.; Svyatkin F. A.; Sintsova T. G.; Modestov Victor S.;

  • 作者单位

    OAO Polzunov Scientific and Development Association on Research and Design of Power Equipment, St. Petersburg, Russian Federation;

    OAO Polzunov Scientific and Development Association on Research and Design of Power Equipment, St. Petersburg, Russian Federation;

    OAO Polzunov Scientific and Development Association on Research and Design of Power Equipment, St. Petersburg, Russian Federation;

    OAO Polzunov Scientific and Development Association on Research and Design of Power Equipment, St. Petersburg, Russian Federation;

    OAO Polzunov Scientific and Development Association on Research and Design of Power Equipment, St. Petersburg, Russian Federation;

    OAO Polzunov Scientific and Development Association on Research and Design of Power Equipment, St. Petersburg, Russian Federation;

    Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russian Federation;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    damage; heat exchange tube; heating steam; hydraulic shock; K-1000-60/1500 turbine plant; surface low pressure heater; turbine condensate;

    机译：损伤;换热管加热蒸汽;液压冲击K-1000-60 / 1500涡轮机;表面低压加热器;涡轮凝结水;

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