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題 名 | 核三廠飼水加熱器殼側流場及管束流沖振動分析=Shell-Side Flow and Flow-Induced Vibration Analysis for Feedwater Heaters of the Third Nuclear Power Plant |
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作 者 | 黃金城; 張欽章; 呂祖琪; 洪賢豪; 謝仁盛; 詹益光; 洪慶典; 陳培中; 李清河; 陳翰麃; | 書刊名 | 台電工程月刊 |
卷 期 | 697 民95.09 |
頁 次 | 頁10-27 |
分類號 | 449.2 |
關鍵詞 | 飼水加熱器; 流場分析; 流沖振動; Feedwater heater; Flow analysis; Flow induced vibration; |
語 文 | 中文(Chinese) |
中文摘要 | 本文主要進行核三廠飼水加熱器殼側流場及其熱交換管束流沖振動分析,以研判管束對於流沖振動之安全裕度。利用三維計算流體動力分析應用軟體CFX建立加熱器殼側三維流場分析模式,以計算殼側各有關區域的流速分布。殼側局部高流速的橫向流持續沖擊管束,將造成較高之流體作用力並可能引起管束流沖振動。由於飼水加熱器管束流沖振動主要關切的機制為漩渦激勵振動及流彈性不穩定。因此,本文主要利用HEI及TEMA規範之管束流沖振動評估導則,配合殼側各區域實際計算局部流速分布,進行飼水加熱器管束流沖振動的評析。依據流沖振動評估導則,實際考量核三廠飼水加熱器管子結構尺寸材質、管束排列型式與間距以計算附加質量。而針對不同的管束支撐跨距及型式,計算管束自然振動頻率以及配合不同流體密度及流彈性參數計算流彈性不穩定臨界流速等。本文分別針對飼水加熱器FWHR #3、#4、#5及#6進行流沖振動分析,根據評估結果,FWHR #3、#4、#5及#6其整體內部包括冷凝區及洩水冷卻區管束流速餘裕皆符合要求。然而相對而言,加熱器內部一些區域包括汽機抽汽進口如FWHR #3及#4近南側蒸氣進口噴嘴下方及FWHR #5與#6洩水冷卻區內部洩水進出口附近與其下方管排則流速餘裕都相對較低。上述局部區域管束流沖振動流速安全餘裕雖尚符合要求,然而隨著飼水加熱器的持續運轉及可能影響劣化的變因複雜,應加以持續監測,以落實預防管束流沖振動於未然。綜合整體分析結果,飼水加熱器FWHR #3、#4、#5及#6內部各區域管束應無流沖振動顧慮,目前無採取任何相關積極防治措施之需求。 |
英文摘要 | This paper is to perform the flow analysis and flow induced vibration (FIV) analysis for feedwater heaters of the Third Nuclear Power Plant to assess the safety margin of tubes against FIV. By using a computational fluid dynamics analysis software, CFX, a three dimensional flow analysis model is developed to calculate the flow velocity distribution around different local areas in heaters. For FIV mechanisms, vortex excited vibration and fluidelastic instability are thought to be dominant to heaters. The FIV evaluation guidelines of HEI (Heat Exchanger Institute) and TEMA (Tubular Exchanger Manufactures Associate) are thus used to associate with the shell side flow calculated in this work. Feedwater heaters #3, #4, #5 and #6 of Maanshan are completely analyzed. Present computed results show the flow velocity margins of tubes inside these feedwater heaters including the areas of condensing zone and drain cooling zone all meet the safety requirements. However, the relative lower flow velocity margins near the local areas of extraction steam inlets and drain coolers are observed. Although these lower values still give sufficient velocity margins, the continuing inspections should be performed for preventing the tubular flow induced vibration of the analyzed feedwater heaters. There is no any related active measure else should be taken to present analyzed heaters in this work. |
本系統中英文摘要資訊取自各篇刊載內容。