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预测加热器进口防冲挡板及壳壁冲蚀位置的数值模拟 预览
Simulation Prediction of Wear Sites Distributions on Inlet Impingement Plate and Shell Wall of a Feedwater Heater
摘要
基于高压加热器的简化模型进行了三维建模并建立了气液两相流冲蚀模型,对挡板及壳壁可能发生冲蚀的位置进行预测,确定壁面减薄指标,并对加热器蒸汽进口防冲挡板法向速度和上级疏水挡板的法向速度随进口水体积分数及机组负荷变化进行了模拟和分析。结果表明:提出的模型能够直观准确地预测挡板及壳壁发生冲蚀的位置,数值模拟预测结果与电厂实际发生冲蚀的位置吻合良好,可为高压加热器安全经济运行提供理论指导。
Based on the simplified model of high pressure heater,a three-dimensional modeling method was developed and a steam-water two-phase flow erosion model was established to predict the possible wear sites on the shell wall and impingement plate of the heater,and subsequently the wall thinning indicator was derived from the impingement erosion model.Moreover,the variation of the normal velocity on the inlet impingement plate and upper drain baffle plate with the inlet water flow and unit load was simulated and analyzed.Results show that the model proposed could intuitively and accurately predict the erosion location on the impingement plate and the shell wall.The prediction results agree well with actual erosion sites in the power plant,which therefore may serve as a reference for safe and economic operation of high pressure heaters.
出处
《发电设备》
2019年第5期304-308,共5页
Power Equipment
关键词
高压加热器
两相流冲蚀
壁面减薄指标
冲蚀位置
防冲挡板
疏水挡板
high pressure heater
two-phase flow erosion
wall thinning indicator
wear site
impingement plate
drain baffle plate
作者简介
陈晓欣(1992-),女,在读硕士研究生,研究方向为电站回热系统加热器仿真模拟和有机朗肯循环系统性能。E-mail:1728153800@qq.com.
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