Method and system for diagnosing state of gas turbine

• US 20040148129A1
• Filed: 08/18/2003
• Published: 07/29/2004
• Est. Priority Date: 06/18/2001
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Sakurai, Shigeo, Hayasaka, Yasushi, Ikeda, Hiraku, Gotoh, Jinichiro
• Granted Patent: US 7,065,471 B2
• Time in Patent Office: Days
• US Class Current: 702/183
• CPC Class Codes: F02C 7/00 Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants controlling F02C9/00
• CPC Class Codes: F02C 9/00 Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants controlling air intakes F02C7/057; controlling turbines F01D; controlling compressors F04D27/00; controlling in general G05
• CPC Class Codes: F05D 2260/80 Diagnostics
• CPC Class Codes: F05D 2270/11 to prolong engine life
• CPC Class Codes: F05D 2270/30 Control parameters, e.g. input parameters
• CPC Class Codes: F05D 2270/44 active, predictive, or anticipative
• CPC Class Codes: G05B 23/0229 knowledge based, e.g. expert systems; genetic algorithms
• CPC Class Codes: G05B 23/0283 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] preventive maintenance, i.e. planning maintenance according to the available resources without monitoring the system G06Q10/06

Abstract

An operation monitoring unit 11 for acquiring process data from sensors 10 installed to a gas turbine and operation information of the gas turbine; communication units 12, 14 for transmitting each of said two kinds of data on the gas turbine acquired in the operation monitoring unit 11; an analysis server 16 which calculates values of equivalent operating time using each of the two kinds of data obtained through the communication units 12, 14, the value of equivalent operating time evaluating a degree of damage of a diagnosed position for each of a plurality of degradation-and-damage modes, and calculates a value of whole equivalent operating time by adding the values of equivalent operating time for the individual degradation-and-damage modes; and a facility management unit 15 client-server systemized using the analysis server 16 and a WWW browser 20 or WWW server 19 are provided. By acquiring the above-described two kinds of data relating to the gas turbine during operating the gas turbine into the analysis server 16 through the communication units 12, 14, a highly accurate analysis result of damage condition can be speedy obtained from values of equivalent operating time for a plurality of degradation-and-damage modes. Further, it is also possible to provide convenience that a person in a remote site can speedy and easily view the analysis results using the WWW browser 20 through the client server system.

Claims

1. A method of diagnosing a condition of a gas turbine, the method comprising the steps of:

calculating a value of equivalent operating time using operation data of said gas turbine and process data measured by sensors installed to said gas turbine during operation of said gas turbine during operating said gas turbine, said value of equivalent operating time evaluating a degree of damage of component parts composing said gas turbine using the unit of operating time; and

diagnosing a condition of said gas turbine based on said calculated value of equivalent operating time and a predetermined management base.

2. A method of diagnosing a condition of a gas turbine according to claim 1, wherein said value of equivalent operating time is calculated by adding values of equivalent operating time each of which is calculated for each of degradation-and-damage modes.

3. A method of diagnosing a condition of a gas turbine according to claim 2, wherein thermal fatigue damage is included in said degradation-and-damage modes as one mode;

and a value of equivalent operating time relating to said thermal fatigue damage is calculated as a sum of a plurality of values of equivalent operating time selected from the group consisting of a value of equivalent operating time corresponding to number of startup-and-shutdown times, a value of equivalent operating time corresponding to number of load change times and a value of equivalent operating time corresponding to number of trip shutdown times.

4. A method of diagnosing a condition of a gas turbine according to claim 3, wherein the value of equivalent operating time for each of the degradation-and-damage modes is calculated by multiplying a ratio by a value of actual operating time or a coefficient converting number of times to the unit expressing time, said ratio being a ratio of a damage ratio obtained from data at present time point to a damage ratio in a design base.

5. A method of diagnosing a condition of a gas turbine according to claim 4, which further comprises the step of predicting a remaining lifetime from the calculated equivalent operating time at present to the time that the equivalent operating time reaches said management base.

6. A method of diagnosing a condition of a gas turbine according to claim 4, which further comprises the step of predicting a maximum value and a minimum value of remaining lifetime from the calculated equivalent operating time at present to the time that the equivalent operating time reaches said management base.

7. A system of diagnosing a condition of a gas turbine, the system comprising:

sensors installed to the gas turbine;

means for calculating values of equivalent operating time using process information detected by said sensors and operation information, said value of equivalent operating time evaluating a degree of damage of a diagnosed position for each of a plurality of degradation-and-damage modes;

means for calculating a value of whole equivalent operating time by adding said values of equivalent operating time for the individual degradation-and-damage modes;

means for diagnosing the condition of the gas turbine based on said calculated value of whole equivalent operating time and a predetermined management base; and

means for displaying a result diagnosed by said diagnosing means.

8. A system of diagnosing a condition of a gas turbine according to claim 7, which further comprises means for calculating the value of equivalent operating time for each of the plurality of degradation-and-damage modes by multiplying a ratio by a value of actual operating time or a coefficient converting number of times to the unit expressing time, said ratio being a ratio of a damage ratio obtained from data at present to a damage ratio in a design base.

9. A system of diagnosing a condition of a gas turbine according to claim 8, which further comprises means for predicting a remaining lifetime from the calculated equivalent operating time at present to the time that the equivalent operating time reaches said management base.

10. A system of diagnosing a condition of a gas turbine according to claim 9, which further comprises means for predicting a maximum value and a minimum value of a remaining lifetime from the calculated equivalent operating time at present to the time that the equivalent operating time reaches said management base.

11. A system of diagnosing a condition of a gas turbine, the system comprising:

an operation monitoring unit for acquiring process data from sensors installed to said gas turbine and operation data of said gas turbine;

communication units for transmitting each of said two kinds of information on said gas turbine acquired in said operation monitoring unit;

an analysis server which calculates values of equivalent operating time using each of said two kinds of information on said gas turbine obtained through said communication units, said value of equivalent operating time evaluating a degree of damage of a diagnosed position for each of a plurality of degradation-and-damage modes, and calculates a value of whole equivalent operating time by adding said values of equivalent operating time for the individual degradation-and-damage modes, and diagnoses the condition of the gas turbine based on said calculated value of whole equivalent operating time and a predetermined management base; and

a facility management unit having said analysis server and a WWW browser or WWW server.

12. A system of diagnosing a condition of a gas turbine according to claim 11, wherein said operation monitoring unit comprises means for displaying contents of a result analyzed by said analysis server received through said communication units.