(3.227.235.183) 您好!臺灣時間:2021/04/20 08:44
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果

詳目顯示:::

我願授權國圖
: 
twitterline
研究生:鍾明雄
研究生(外文):Ming-hsiung Jong
論文名稱:提昇渦電流檢測於熱交換管缺陷深度檢測準確性之探討
論文名稱(外文):Using Eddy Current Testing Method to Evaluate the Depth of the Defects in the Heat Exchanger Tubes
指導教授:楊旭光楊旭光引用關係
指導教授(外文):Shiuh-kuang YANG
學位類別:碩士
校院名稱:國立中山大學
系所名稱:機械與機電工程學系研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2006
畢業學年度:94
語文別:中文
論文頁數:116
中文關鍵詞:渦電流檢測深度準確性熱交換器
外文關鍵詞:Heat ExchangerDepthECTEddy Current Testing
相關次數:
  • 被引用被引用:0
  • 點閱點閱:546
  • 評分評分:系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
對於非磁性管件而言,渦電流檢測方法目前仍然是業界最常用的檢測方式。此方法可檢出管件內壁及外壁之各種缺陷,診斷系統的潛在問題。但是不正確的檢測分析,其檢測結果誤差有可能大於15〜25%,甚至多達40%,這會影響檢測人員以及業主對檢測結論的信心。基於此,本論文首先分析鋁黃銅(Aluminum Brass)冷凝管在檢測中發生不準確的各種問題點,整理出渦電流檢測發生誤差的原因,探討訊號量測分析上的技術,研究因應方案,設計製作參考用測試管,並以渦電流設備量取人工缺陷的訊號,然後從取得之訊號數據中分析其相關性,作為修正訊號評估方式的參考。共歸納出二種改善方案,一為修正公式,方法是將一般評估方法所得到之數據乘以此修正公式後,所得的結果會更接近實際深度,對於振幅較大之缺陷,效果頗佳;另一為輔助評估曲線,係利用管內壁之一系列人工缺陷求得符合實際深度之關係曲線,即在主頻率之評估曲線旁再繪製一條輔助曲線,可改善一般之管內壁缺陷評估結果。利用本研究所開發的二種缺陷修正法的優點是,檢測人員仍可參照傳統的檢測評估法,不需額外的投資。本研究並以現場抽出之缺陷管驗證實驗結果,所探討的二種因應方案皆經現場實際應用,能改善檢測的準確度,並使檢測結果更符合缺陷真正的深度,可降低破管機率。
For the evaluation of non-ferrous heat exchanger tube, there are many non-destructive testing methods; however, the eddy current testing (ECT) method is the most popular one. By using of ECT, you may find out the defects existing inside or outside the tube wall, diagnose the heat exchanger system and find out the latent problems. The problem is that an improper signal analysis will result in error in the range of 15〜25% of the tube wall thickness, or even over 40% error. This is a great discouragement to the ECT inspectors, and will reduce the confidence of the proprietors of power plants or petro-chemical industries to the use of ECT. Therefore, in this thesis, the study is mainly focus on the problems of the aluminum brass tubes in condenser using ECT method. This thesis will analyze the causes of error of aluminum brass tubes when using ECT, prepare calibration and reference tubes, and test them using eddy current instruments. The relationship among the raw data with volts, phase angle and depth has been found. Two data evaluation methods are developed, one is the defect depth modification equation and the other is the auxiliary evaluation curve. The new methods are proved to be more accurate and practical in the evaluation of heat exchanger tube after more than one year of verification by field testing in the power plant. The results obtained in this thesis are very helpful to reduce the probability of tube failure.
目 錄
謝誌 ------------------------------------------------- i
中文摘要 ---------------------------------------------ii
英文摘要 --------------------------------------------iii
目錄 ------------------------------------------------ iv
符號與術語輯要 ---------------------------------------vi
表目錄 ---------------------------------------------viii
圖目錄 -----------------------------------------------ix
第一章 緒論 ------------------------------------------ 1
1.1前言 ---------------------------------------------- 1
1.2文獻回顧 ------------------------------------------ 4
1.3評估方法 ------------------------------------------ 6
1.4研究方法 ------------------------------------------10
第二章 基本理論 --------------------------------------14
2.1渦電流線圈與訊號 ----------------------------------14
2.2集膚效應(Skin Effect)----------------------------15
2.3標準透入深度(Standard Depth of Penetration)------16
第三章 實驗架構 --------------------------------------27
3.1實驗儀器設備 --------------------------------------27
3.2實驗測試管 ----------------------------------------29
第四章 實驗結果與討論 --------------------------------40
4.1標準管及參考管之測試 ------------------------------40
4.1.1標準管測試 --------------------------------------40
4.1.2外壁刻痕參考管之測試-----------------------------41
4.1.3內壁平底孔缺陷測試-------------------------------42
4.1.4外壁平底洞測試-----------------------------------44
4.1.5不同孔徑之貫穿孔測試 ----------------------------45
4.1.6 V型孔參考管之測試 ------------------------------48
4.2 評估曲線之分析 -----------------------------------48
4.3 輔助頻率之討論 -----------------------------------49
4.4 頻率設定上的討論 ---------------------------------50
4.5 實驗結果綜合討論 ---------------------------------50
第五章 案例分析 --------------------------------------71
案例1 -----------------------------------------------71
案例2 -----------------------------------------------72
案例3 -----------------------------------------------73
案例4 -----------------------------------------------73
案例5 -----------------------------------------------74
案例6 -----------------------------------------------75
案例7 -----------------------------------------------75
案例8 -----------------------------------------------76
第六章 結論與未來展望 --------------------------------87
1.結論 -----------------------------------------------87
2.未來展望 -------------------------------------------90
參考文獻 ---------------------------------------------91
附錄A 熱交換器之檢測 ---------------------------------94
A.1熱交換器之構造與設計 ------------------------------94
A.2內部區間及可能發生之問題 --------------------------95
A.3熱交換器的損壞機構 --------------------------------96
A.3.1製造及安裝之缺陷 --------------------------------97
A.3.2機械力之損壞模式 --------------------------------97
A.3.3腐蝕相關之損壞模式 ------------------------------98
A.4檢測方法 -----------------------------------------100
A.5非磁性熱交換管現場檢測 ---------------------------100
A.6檢測準備作業 -------------------------------------101
1. S.Yokell, A Working Guide to Shell-and-Tube Heat Exchangers, McGraw-Hill Publishing Company, pp.357-565, 1990.
2. The American Society for Nondestructive Testing, Nondestructive Handbook, Volume 5, Electromagnetic Testing, Third Edition, pp.1-56, 2004.
3. ASME, Boiler and Pressure Vessel Code : Section V, Nondestructive Examinations, Article-8, Eddy Current Testing, ASME New York, 2001.
4. ASTM International, B111/B111M-04 Standard Specification for Copper and Copper-Alloy Seamless Condenser Tubes and Ferrule Stock, 2001.
5. ASTM, E-243: Standard Practice for Electromagnetic Examination of Copper and Copper-Alloy Tubes Electromagnetic (Eddy Current) Testing of Seamless Copper and Copper Alloy tubes, 2004.
6. ASTM, E 690: In-situ Eelectromagnetic(Eddy Current) Examination of Non-magnetic Heat Exchanger Tubes, 2004.
7. ASTM, E1316: Definition of Terms Relating to Electromagnetic Testing, 2004.
8. ASTM, E1004-02: Standard Practice for Determining Electrical Conductivity Using the Electromagnetic (Eddy-Current) Method, 2002.
9. ASTM, G46: Recommended Practice for Examination and Evaluation of Pitting Corrosion, 2005.
10. J. Robert, An Engineer’s Guide to Electromagnetic Testing of BOP Heat Exchanger, Tubing Heat Exchanger Systems Inc., Annapolis, MD, USA, pp.1-17, 2005.
11. S.N. Rajesh, Probability of Detection Models for Eddy Current NDE Meth¬ods, Thesis of PHD, Ames. Lab., Iowa State University, 1993.
12. CNS 11050,渦電流檢測法通則,經濟部中央標準局,1996。
13. CNS12834,銅及銅合金管渦電流檢驗法,經濟部中央標準局,1991。
14. A.S. Cecco, Eddy Current Testing, Volume 1, Atomic Energy of Canada Limited, Ontario, Canada, pp.7-134, 1983.
15. 鄭錦智,降低遙場渦電流檢測評估誤差之研究,國立中山大學機械與機電工程研究所博士論文,2002。
16. A.S. Birring, “Eddy Current Inspection of Non-Ferromagnetic and Ferromagnetic Tubing,” Proceedings of the ASNT 1993 International Chemical and Petroleum Industry Inspection Conference, Houston, Texas, 1993.
17. G.A. Marshall and A.S. Birring, “Eddy Current Testing in the Petrochemical Industry,” Materials Evaluation, November, 2003.

18. H. Houserman, D.Brown, and M. Klatt “The Effect of Digitizing Rates on Motorized Rotating Pancake Coil MRPC Inspections,” Presented at the 13th EPRI Steam Generator Workshop La Jolla, CA 1994.
19. D. Bajula, “Chemical and Petroleum Applications of Electromagnetic Testing,” Longview Inspection Inc., Texas, 2003.
20. 鍾明雄,低導磁率熱交換管電磁檢測技術之探討,第13屆中華民國非破壞檢測研討會,2006。
21. A.S. Birring, “Sizing of ID Pits in Tubes by Eddy Current Testing,” ASNT International Conference on Inspection in the Petrochemical Industry, Houston, June, 2001.
22. 黃純夫,渦電流檢測法,中華民國非破壞檢測協會,第55-85頁,1990。
23. B.P.C. Rao, “Simulation of Eddy Current Signals from Multiple Defects,” NDT&E International, Vol.29, pp.269-273, 1996.
24. P. Xiang, Automatic Multi-frequency Rotating-probe Eddy current Data Analysis, Thesis of PHD, Department of Electrical Engineer, Iowa State University, 2005.
25. 董寶鴻,提高冷凝器管外壁氨腐蝕凹槽渦電流評估精確度,檢測科技,中華民國非破壞檢測協會,2000。
26. 孫振峰,金屬材質特性影響渦電流非破壞性檢測之研究分析與應用,國立高雄應用科技大學電機工程系碩士論文,2004。
27. 楊弘吉,渦電流非破壞性檢測系統之設計及應用,國立成功大學電機工程學系博士論文,2004。
28. 李冠勳,差動式渦電流探頭於缺陷偵測之最佳激發頻率研究,國立臺北科技大學碩士論文,2004。
29. 林建宏,渦電流檢測評估曲線與檢測誤差之有限元素分析,國立中山大學機械與機電工程研究所博士論文,2004。
30. Zetec, NDE Testing Technologies, [線上資料],資料來源:http://www.zetec.com/resources/ndt_technologies.asp#
31. 鍾明雄,不�袗�熱交換管之破損及檢測,非破壞檢測協會,檢測技術期刊,第11卷5期,第57-62頁,1993。
QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top
系統版面圖檔 系統版面圖檔