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首页> 外文期刊>Thermal engineering >Condensation Heat Transfer of Pure Steam and Steam from Gas-Steam Mixture in Tubes of AES-2006 PHRS SG Heat Exchanger
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Condensation Heat Transfer of Pure Steam and Steam from Gas-Steam Mixture in Tubes of AES-2006 PHRS SG Heat Exchanger

机译：AES-2006 PHRS SG换热器管内纯蒸汽和蒸汽混合物中的蒸汽的冷凝传热

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摘要

Results of experimental determination of the average heat transfer coefficient upon condensation of pure steam α_c and steam from air-steam mixture α_(as.m) in tubes of a large-scale model of the emergency cooling heat exchanger in the system of passive heat removal through steam generators of AES-2006 project at Leningrad Ⅱ NPP are presented. The model contained 16 parallel tubes with a diameter of 16 × 2 mm and a length of 2.9 m connected to the upper steam distributing and lower condensate gathering horizontal collectors; the distance between their axes was 2.28 m. The tube segments were vertical, horizontal, or inclined. The internal diameter of the collectors was 40 or 60 mm. The model was placed in the lower part of a tank with a height of 6.5 m and a volume of 5.85 m~3 filled with boiling water at atmospheric pressure. The experimental parameters were as follows: pressure range 0.43-7.77 MPa, condensate Reynolds number Re_f = (0.87-9.3) × 10~3, and average air volume fraction at the segment with air-steam mixture 0.18-0.85. The studies showed that nonunifor-mity of static pressure distribution along the steam-distributing collector strongly influences the reduction of α_c value (ejecting effect). The agreement between experimental and calculated according to statutory guidelines values of α_c for vertical tubes is achieved if the dynamic head of the steam flow at the input of the steam-distributing collector does not exceed 1 kPa. Equations for calculation of the diffusion heat transfer coefficient at steam condensation from the air-steam mixture α_(as.m) on the internal tube surface are proposed. In the considered conditions, air is completely displaced by steam flow from the upper to the lower part of the tubes. The boundary between these regions is characterized by an average reduced steam velocity through this cross section of 1.6 ± 0.4 m/s. Above the boundary cross section, it is recommended to calculate α_c. according to [1].
机译：被动除热系统中大型紧急冷却换热器模型中的纯蒸汽α_c和空气-蒸汽混合物α_（as.m）冷凝后的平均传热系数的实验测定结果介绍了列宁格勒Ⅱ号核电厂AES-2006项目蒸汽发生器的发电过程。该模型包含16个平行管，其直径为16×2 mm，长度为2.9 m，连接到上部蒸汽分配和下部冷凝物收集水平收集器。他们的轴之间的距离是2.28 m。管段是垂直，水平或倾斜的。集电器的内径为40或60mm。将模型放置在水箱的下部，水箱的高度为6.5 m，容积为5.85 m〜3，在大气压下充满沸水。实验参数如下：压力范围0.43-7.77 MPa，冷凝物雷诺数Re_f =（0.87-9.3）×10〜3，空气-蒸汽混合物段的平均风量分数为0.18-0.85。研究表明，沿蒸汽分布收集器的静压分布不均匀会严重影响α_c值的降低（喷射效应）。如果在蒸汽分配收集器的输入端蒸汽流的动态扬程不超过1 kPa，则将根据垂直管道的法定指导值α_c与实验值和计算值达成一致。提出了用于计算内管表面空气-蒸汽混合物α_（as.m）的冷凝水扩散传热系数的方程。在所考虑的条件下，空气被蒸汽从管的上部到下部完全置换。这些区域之间的边界的特征是通过该横截面的平均蒸汽速度降低为1.6±0.4 m / s。建议在边界横截面上方计算α_c。根据[1]。

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  • 来源
    《Thermal engineering》 |2017年第1期|25-31|共7页
  • 作者

    B. F. Balunov; V. A. Ilin; A. A. Shcheglov; V. D. Lychakov; S. B. Alekseev; V. O. Kuhtevich; S. V. Svetlov; V. G. Sidorov;

  • 作者单位

    OAO Polzunov Scientific and Development Association on Research and Design of Power Equipment, St. Petersburg, 191167 Russia;

    OAO Polzunov Scientific and Development Association on Research and Design of Power Equipment, St. Petersburg, 191167 Russia;

    OAO Polzunov Scientific and Development Association on Research and Design of Power Equipment, St. Petersburg, 191167 Russia;

    OAO Polzunov Scientific and Development Association on Research and Design of Power Equipment, St. Petersburg, 191167 Russia;

    OAO ATOMPROEKT Scientific Research and Design Construction Institute of Power Technologies, St. Petersburg, 197183 Russia;

    OAO ATOMPROEKT Scientific Research and Design Construction Institute of Power Technologies, St. Petersburg, 197183 Russia;

    OAO ATOMPROEKT Scientific Research and Design Construction Institute of Power Technologies, St. Petersburg, 197183 Russia;

    OAO ATOMPROEKT Scientific Research and Design Construction Institute of Power Technologies, St. Petersburg, 197183 Russia;

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  • 正文语种 eng
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  • 关键词

    passive heat removal system through steam generators; noncondensable gases; condensation; heat transfer; natural circulation;

    机译：通过蒸汽发生器的被动排热系统;不凝性气体;缩合;传播热量;自然循环;

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