KR100822506B1 - 터빈 버킷 산화 상태의 평가 방법 및 시스템, 그리고 터빈의 동작중에 터빈 버킷 산화 상태를 평가하여 잔여 유효 버킷 수명을 예측하는 방법 - Google Patents
터빈 버킷 산화 상태의 평가 방법 및 시스템, 그리고 터빈의 동작중에 터빈 버킷 산화 상태를 평가하여 잔여 유효 버킷 수명을 예측하는 방법 Download PDFInfo
- Publication number
- KR100822506B1 KR100822506B1 KR1020030077668A KR20030077668A KR100822506B1 KR 100822506 B1 KR100822506 B1 KR 100822506B1 KR 1020030077668 A KR1020030077668 A KR 1020030077668A KR 20030077668 A KR20030077668 A KR 20030077668A KR 100822506 B1 KR100822506 B1 KR 100822506B1
- Authority
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- South Korea
- Prior art keywords
- bucket
- turbine
- oxidation
- status
- pyrometer
- Prior art date
Links
- 238000013528 artificial neural network Methods 0.000 title claims description 12
- 238000012631 diagnostic technique Methods 0.000 title description 3
- 238000012544 monitoring process Methods 0.000 title 1
- 238000004393 prognosis Methods 0.000 title 1
- 230000003647 oxidation Effects 0.000 claims abstract description 47
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 47
- 238000009826 distribution Methods 0.000 claims abstract description 18
- 238000012545 processing Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 20
- 238000012774 diagnostic algorithm Methods 0.000 claims description 8
- 238000011156 evaluation Methods 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims 1
- 238000012423 maintenance Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000009529 body temperature measurement Methods 0.000 description 3
- 230000000875 corresponding effect Effects 0.000 description 3
- 230000002028 premature Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/14—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for responsive to other specific conditions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/10—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for responsive to unwanted deposits on blades, in working-fluid conduits or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/12—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for responsive to temperature
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0022—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiation of moving bodies
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0259—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the response to fault detection
- G05B23/0283—Predictive maintenance, e.g. involving the monitoring of a system and, based on the monitoring results, taking decisions on the maintenance schedule of the monitored system; Estimating remaining useful life [RUL]
Abstract
Description
Claims (8)
- 터빈 버킷 산화 상태의 평가 방법에 있어서,① 고온계(pyrometer)를 이용하여 적어도 하나의 회전하는 터빈 버킷의 시간 변화에 따른 온도 분포를 측정하는 단계와,② 적어도 하나의 회전하는 터빈 버킷에서의 피크 온도 값과 평균 온도 값 사이의 차이를 포함하는 측정된 시간 변화에 따른 온도 분포에 기초하여 상태 지표(condition index)를 결정하는 단계로서, 상기 상태 지표는 버킷 세트의 전체적인 상태 또는 단일 버킷의 특정 상태중 적어도 하나를 반영하는, 상태 지표 결정 단계를 포함하는터빈 버킷 산화 상태의 평가 방법.
- 제 1 항에 있어서,상기 단계 ②는 상기 고온계로부터의 선택된 데이터에 진단 알고리즘을 적용함으로써 실행되는터빈 버킷 산화 상태의 평가 방법.
- 터빈 버킷 산화 상태의 평가 방법에 있어서,① 고온계(pyrometer)를 이용하여 복수 개의 회전하는 터빈 버킷의 시간 변화에 따른 온도 분포를 측정하는 단계와,② 측정된 시간 변화에 따른 온도 분포에 기초하여 상태 지표(condition index)를 결정하는 단계로서, 상기 터빈이 1회전하는 동안 모든 복수의 회전하는 터빈 버킷의 상기 고온계에 의해 측정된 시간 변화에 따른 온도 분포의 평균 온도 값에 대한 복수의 회전하는 터빈 버킷의 중 하나의 각 통로내의 피크 온도 값의 비를 계산함으로써, 버킷 세트의 전체적인 상태 또는 단일 버킷의 특정 상태중 적어도 하나를 상기 상태 지표에 반영시키는, 상태 지표 결정 단계를 포함하는터빈 버킷 산화 상태의 평가 방법.
- 제 1 항에 있어서,공지된 검사 데이터와의 비교에 따라 버킷 산화량을 결정하는 단계 ③을 더 포함하는터빈 버킷 산화 상태의 평가 방법.
- 제 4 항에 있어서,상기 단계 ③은 피드 포워드 신경망을 수립하고 파손된 터빈 버킷의 산화 레벨을 결정함으로써 실행되는터빈 버킷 산화 상태의 평가 방법.
- 제 5 항에 있어서,버킷 산화량에 따라 피드 포워드 신경망을 통해 잔여 버킷 수명을 결정하는 단계를 더 포함하는터빈 버킷 산화 상태의 평가 방법.
- 적어도 하나의 회전하는 터빈 버킷의 고온계에 의해 측정된 시간 변화에 따른 온도 분포를 처리함으로써, 터빈의 동작중에 터빈 버킷 산화 상태를 평가하여 잔여 유효 버킷 수명을 예측하는 방법에 있어서,상기 온도 분포는 적어도 하나의 회전하는 터빈 버킷에서의 피크 온도 값과 평균 온도 값 사이의 차이를 포함하는터빈의 동작중에 터빈 버킷 산화 상태를 평가하여 잔여 유효 버킷 수명을 예측하는 방법.
- 터빈 버킷 산화 상태의 평가 시스템에 있어서,적어도 하나의 회전하는 터빈 버킷의 시간 변화에 따른 온도 분포를 측정하는 고온계와,상기 고온계로부터의 출력을 수신하여 적어도 하나의 회전하는 터빈 버킷에서의 피크 온도 값과 평균 온도 값 사이의 차이를 포함하는 측정된 시간 변화에 따른 온도 분포에 기초하여 상태 지표를 결정하는 프로세서를 포함하며,상기 상태 지표는 버킷 세트의 전체적인 상태 또는 단일 버킷의 특정 상태중 적어도 하나를 반영하는터빈 버킷 산화 상태의 평가 시스템.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/288,296 US6786635B2 (en) | 2002-11-06 | 2002-11-06 | Turbine blade (bucket) health monitoring and prognosis using neural network based diagnostic techniques in conjunction with pyrometer signals |
US10/288,296 | 2002-11-06 |
Publications (2)
Publication Number | Publication Date |
---|---|
KR20040040370A KR20040040370A (ko) | 2004-05-12 |
KR100822506B1 true KR100822506B1 (ko) | 2008-04-16 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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KR1020030077668A KR100822506B1 (ko) | 2002-11-06 | 2003-11-04 | 터빈 버킷 산화 상태의 평가 방법 및 시스템, 그리고 터빈의 동작중에 터빈 버킷 산화 상태를 평가하여 잔여 유효 버킷 수명을 예측하는 방법 |
Country Status (5)
Country | Link |
---|---|
US (1) | US6786635B2 (ko) |
EP (1) | EP1418312B1 (ko) |
JP (1) | JP4458815B2 (ko) |
KR (1) | KR100822506B1 (ko) |
CA (1) | CA2446323A1 (ko) |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7457785B1 (en) * | 2000-08-25 | 2008-11-25 | Battelle Memorial Institute | Method and apparatus to predict the remaining service life of an operating system |
US7313485B2 (en) * | 2004-07-30 | 2007-12-25 | Siemens Power Generation, Inc. | Method of estimating oxidation progression in coated turbine components |
US8065022B2 (en) * | 2005-09-06 | 2011-11-22 | General Electric Company | Methods and systems for neural network modeling of turbine components |
US7633066B2 (en) * | 2006-05-22 | 2009-12-15 | General Electric Company | Multiwavelength pyrometry systems |
CN100370117C (zh) * | 2006-08-21 | 2008-02-20 | 上海发电设备成套设计研究院 | 一种汽轮机转子等效应力安全裕度系数在线监控方法 |
WO2009056489A2 (de) * | 2007-11-02 | 2009-05-07 | Alstom Technology Ltd | Verfahren zur bestimmung der restlebensdauer eines rotors einer thermisch belasteten strömungsmaschine |
GB2455798B (en) * | 2007-12-21 | 2010-04-28 | Weston Aerospace Ltd | Method and apparatus for monitoring a rotating shaft |
US20090285259A1 (en) * | 2008-05-14 | 2009-11-19 | General Electric Company | System and method for thermal inspection of objects |
US20100154430A1 (en) * | 2008-12-22 | 2010-06-24 | Krishan Lal Luthra | System and method for operating a gas turbine using vanadium-containing fuels |
US8790006B2 (en) * | 2009-11-30 | 2014-07-29 | General Electric Company | Multiwavelength thermometer |
US8712739B2 (en) | 2010-11-19 | 2014-04-29 | General Electric Company | System and method for hybrid risk modeling of turbomachinery |
US10132688B2 (en) | 2010-12-17 | 2018-11-20 | General Electric Company | System and method for detecting spall within a turbine engine |
US8974180B2 (en) * | 2011-11-17 | 2015-03-10 | General Electric Company | System and method for estimating operating temperature of turbo machinery |
US10272475B2 (en) | 2012-11-07 | 2019-04-30 | General, Electric Company | Offline compressor wash systems and methods |
US9670796B2 (en) | 2012-11-07 | 2017-06-06 | General Electric Company | Compressor bellmouth with a wash door |
JP6517728B2 (ja) | 2016-05-12 | 2019-05-22 | ファナック株式会社 | 射出成形機の逆流防止弁の摩耗量推定装置および摩耗量推定方法 |
EP3299588A1 (de) * | 2016-09-23 | 2018-03-28 | Siemens Aktiengesellschaft | Verfahren zur schadenserkennung bei betrieb einer brennkraftmaschine |
RU2686385C1 (ru) * | 2018-05-23 | 2019-04-25 | федеральное государственное автономное образовательное учреждение высшего образования "Санкт-Петербургский национальный исследовательский университет информационных технологий, механики и оптики" (Университет ИТМО) | Способ спектрометрического определения температуры потока газов |
GB201908496D0 (en) | 2019-06-13 | 2019-07-31 | Rolls Royce Plc | Computer-implemented methods for determining compressor operability |
GB201908494D0 (en) * | 2019-06-13 | 2019-07-31 | Rolls Royce Plc | Computer-implemented methods for training a machine learning algorithm |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59133442A (ja) | 1982-12-24 | 1984-07-31 | ロ−ルス・ロイス・ピ−エルシ− | 光学式放射線温度計 |
WO2001046660A1 (en) * | 1999-12-22 | 2001-06-28 | Siemens Westinghouse Power Corporation | Method and apparatus for measuring on line failure of turbine thermal barrier coatings |
JP2001174366A (ja) | 1999-11-26 | 2001-06-29 | General Electric Co <Ge> | モデルベースの診断方法と装置 |
JP2002180851A (ja) | 2000-11-02 | 2002-06-26 | General Electric Co <Ge> | ガスタービンエンジン作動を監視する方法及び装置 |
US20020122458A1 (en) | 2000-12-28 | 2002-09-05 | Ingallinera Michael David | Utilization of pyrometer data to detect oxidation |
Family Cites Families (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3584509A (en) * | 1968-10-01 | 1971-06-15 | Int Harvester Co | Temperature measuring apparatus and methods |
US3592061A (en) * | 1969-08-22 | 1971-07-13 | Gen Motors Corp | Gas turbine airfoil having integral thermocouple |
GB1411285A (en) * | 1972-07-06 | 1975-10-22 | Rolls Royce | Radiation pyrometers |
GB2133877B (en) * | 1982-12-24 | 1986-12-03 | Rolls Royce | Generation of a signal dependent upon temperature of gas turbine rotor blades |
US4648711A (en) * | 1984-06-08 | 1987-03-10 | The Dow Chemical Company | Sight tube assembly and sensing instrument for controlling a gas turbine |
US4774149A (en) * | 1987-03-17 | 1988-09-27 | General Electric Company | Oxidation-and hot corrosion-resistant nickel-base alloy coatings and claddings for industrial and marine gas turbine hot section components and resulting composite articles |
DE3919920A1 (de) * | 1989-06-19 | 1991-01-03 | Leybold Ag | Einrichtung zum messtechnischen erfassen des temperaturverlaufs einer metall- oder metallegierungsschmelze |
US5211007A (en) * | 1991-04-10 | 1993-05-18 | General Electric Company | Method of pressure-ratio control of gas turbine engine |
US5305599A (en) * | 1991-04-10 | 1994-04-26 | General Electric Company | Pressure-ratio control of gas turbine engine |
US5630314A (en) * | 1992-09-10 | 1997-05-20 | Hitachi, Ltd. | Thermal stress relaxation type ceramic coated heat-resistant element |
US5348395A (en) * | 1992-12-11 | 1994-09-20 | General Electric Company | Aspirating pyrometer with platinum thermocouple and radiation shields |
LTIP1892A (en) * | 1993-06-15 | 1994-12-27 | Combustion Eng | Corrosian analysis system and method |
US5421652A (en) * | 1993-12-21 | 1995-06-06 | General Electric Company | Pyrometer adapter |
GB2285700B (en) * | 1994-01-12 | 1998-06-24 | Drallim Ind | Monitoring apparatus and method |
US5838588A (en) * | 1996-12-13 | 1998-11-17 | Siemens Corporate Research, Inc. | Graphical user interface system for steam turbine operating conditions |
US5735666A (en) * | 1996-12-31 | 1998-04-07 | General Electric Company | System and method of controlling thrust forces on a thrust bearing in a rotating structure of a gas turbine engine |
US6125105A (en) * | 1997-06-05 | 2000-09-26 | Nortel Networks Corporation | Method and apparatus for forecasting future values of a time series |
DE19736276B4 (de) * | 1997-08-21 | 2006-07-27 | Alstom Technology Ltd | Optisches Pyrometer für Gasturbinen |
US6353815B1 (en) * | 1998-11-04 | 2002-03-05 | The United States Of America As Represented By The United States Department Of Energy | Statistically qualified neuro-analytic failure detection method and system |
US6286992B1 (en) * | 1999-02-12 | 2001-09-11 | Meritor Heavy Vehicle Systems, Llc | Axle temperature monitor |
US6425241B1 (en) * | 1999-09-21 | 2002-07-30 | General Electric Company | Pyrometer mount for a closed-circuit thermal medium cooled gas turbine |
US6735549B2 (en) * | 2001-03-28 | 2004-05-11 | Westinghouse Electric Co. Llc | Predictive maintenance display system |
US20020177985A1 (en) * | 2001-04-23 | 2002-11-28 | Kraft Joseph Anthony | Computer system and method for radial cooled bucket optimization |
US6871160B2 (en) * | 2001-09-08 | 2005-03-22 | Scientific Monitoring Inc. | Intelligent condition-based engine/equipment management system |
-
2002
- 2002-11-06 US US10/288,296 patent/US6786635B2/en not_active Expired - Lifetime
-
2003
- 2003-10-23 CA CA002446323A patent/CA2446323A1/en not_active Abandoned
- 2003-11-04 KR KR1020030077668A patent/KR100822506B1/ko active IP Right Grant
- 2003-11-05 EP EP03257005.3A patent/EP1418312B1/en not_active Expired - Lifetime
- 2003-11-06 JP JP2003376343A patent/JP4458815B2/ja not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59133442A (ja) | 1982-12-24 | 1984-07-31 | ロ−ルス・ロイス・ピ−エルシ− | 光学式放射線温度計 |
JP2001174366A (ja) | 1999-11-26 | 2001-06-29 | General Electric Co <Ge> | モデルベースの診断方法と装置 |
WO2001046660A1 (en) * | 1999-12-22 | 2001-06-28 | Siemens Westinghouse Power Corporation | Method and apparatus for measuring on line failure of turbine thermal barrier coatings |
JP2002180851A (ja) | 2000-11-02 | 2002-06-26 | General Electric Co <Ge> | ガスタービンエンジン作動を監視する方法及び装置 |
US20020122458A1 (en) | 2000-12-28 | 2002-09-05 | Ingallinera Michael David | Utilization of pyrometer data to detect oxidation |
Also Published As
Publication number | Publication date |
---|---|
US6786635B2 (en) | 2004-09-07 |
EP1418312A2 (en) | 2004-05-12 |
JP2004156616A (ja) | 2004-06-03 |
JP4458815B2 (ja) | 2010-04-28 |
US20040086024A1 (en) | 2004-05-06 |
CA2446323A1 (en) | 2004-05-06 |
EP1418312B1 (en) | 2015-10-21 |
KR20040040370A (ko) | 2004-05-12 |
EP1418312A3 (en) | 2005-09-21 |
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