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題 名 | 汽機低壓轉子盤緣之裂縫檢測技術研發=Development of Ultransonic Inspecting Technique for LP Turbine Disc Rim Cracking |
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作 者 | 吳永豪; 蕭祝阴; 蘇詠舜; 吳耀家; 吳健文; | 書刊名 | 台電工程月刊 |
卷 期 | 591 1997.11[民86.11] |
頁 次 | 頁33-44 |
分類號 | 448.14 |
關鍵詞 | 汽機盤緣; 應力腐蝕破裂; 超音波檢測; Steam turbine disc rim; Stess corrosion cracking; Ultrasonic inspection; |
語 文 | 中文(Chinese) |
中文摘要 | 低壓汽機在高應力且濕熱的環境下運轉,極易在盤緣區發生腐蝕破裂。 至今,無 論製造商或電廠均未找到治本之道,唯有利用各種非破壞檢測法做定期檢查來提前發現破裂 而確保汽機的安全運轉,基於目前一般仍以磁粒檢測為主要的方法來檢查汽機盤緣區域而且 只能檢出外露於端面的裂縫,本報計畫乃建立一套以西屋式輪盤為主要檢測對象之超音波檢 測技術來檢出內藏式裂縫。 本計畫為期一年半, 主要工作重點包括:將除役之低壓汽機轉子 Disc #3 製成實物模、設 計製件評估所需的掃描機構及探頭來輔助檢測分析、現場實測驗證等。而本研究所運用之超 音波檢測系統、徒手掃描裝置及檢測法已分別在實物模擬以及核能電廠之汽機上證實可以順 利實施 6R/7R 盤緣之全域檢測,同時亦證實可以檢出 1mm 深凹槽、2mm 直徑以上之平底洞 和外露於端面 3mm 長度以上之真實裂縫,並已完成檢測程書之擬訂。 未來,此項結果尚可 作為其他型式輪盤檢測規劃的參考。 |
英文摘要 | Low pressure turbines are always subjected to stress corrosion cracking (SCC) at the disc rim region under high stress and wet enviornment. Before manufacturers and utilities can solve this problem thoroughly, the only solution to ensure the safe operation of low pressure turbine is to carry on the ISI by various NDT techniques in which the ultrasonic method is the only way to find out internal cracks without dismantling the blades. Due to the fact that nuclear plants are currently using MT as a main method to inspect the turbine disc cracking, this program is carried out to establish an ultuasonic technique to detect internal cracks on disc rims of Westinghouse turbines. Main jobs completed in the one-and-half-year project include: (1) utilizing the retired LP turbine disc #3 to establish a Mock-up, (2) designing and manufacturing a manipulator and focus probes for the ultrasonic evaluation, (3) field testing validation and completed inspection procedure. It was shown that the inspection system and test method proposed in our study was capable of detecting 1 mm deep notches, 2 mm Dia. FBH, which were used to simulate type I cracks, and 3 mm real crack by Pulse-echo method. These results had been proved on mock-up and field trials in nuclear plant. Meanwhile, ultrasonic inspectino programs on different tubines can also be proposed in terms of these results. |
本系統中英文摘要資訊取自各篇刊載內容。