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Predicting distributions of wear sites on shell wall of feedwater heater in nuclear power plant using two phase models

机译：基于两相模型的核电厂给水加热器壳体壁磨损部位分布预测

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摘要

Severe wall thinning may cause a leak on the feedwater heaters (FWHs) shell wall, which could result in the nuclear power plant derating or shutdown, even personal fatalities. This wall thinning of FWHs shell is essentially engendered by droplet impingement wear, which is strongly related to the two phase flow characteristics within the shell side. In this paper, two phase models are proposed to investigate the characteristics of droplet flow and predict the distributions of impingement wear sites for the FWHs. These models include the Eulerian/ Lagrangian droplet type two phase models and the droplet impingement wear model. Based on the simulation results, the flow models can reasonably capture the three dimensional distribution of droplet flow and its rebound characteristics within the FWHs shell side. Coupled with these flow characteristics, an appropriate indicator, derived from the droplet impingement wear model, is used to predict the severe wear sites on the FWHs shell wall. The predicted wear sites agree well with the plant measured data for the selected nuclear power plant. The unsymmetrical distribution patterns of wear sites are also precisely captured. These correspondences show that the two phase models presented herein can be used to investigate the flow characteristics and impingement wear for FWHs in the nuclear power plant.
机译：严重的壁厚减薄可能会导致给水加热器（FWH）的壳壁泄漏，从而可能导致核电站的功率降低或停机，甚至导致人员伤亡。 FWHs外壳的壁变薄主要是由液滴撞击磨损引起的，这与外壳侧面的两相流动特性密切相关。在本文中，提出了两个阶段的模型来研究液滴流动的特性，并预测FWHs的冲击磨损部位的分布。这些模型包括欧拉/拉格朗日液滴类型两相模型和液滴撞击磨损模型。基于模拟结果，流动模型可以合理地捕获液滴流的三维分布及其在FWHs壳侧的回弹特性。结合这些流动特性，从液滴撞击磨损模型得出的适当指标可用于预测FWHs壳壁上的严重磨损部位。预计的磨损场所与选定核电厂的电厂实测数据非常吻合。磨损部位的非对称分布模式也可以精确捕获。这些对应关系表明，本文介绍的两个阶段模型可用于研究核电厂FWH的流动特性和冲击磨损。

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