JP2006125299A - Device for evaluating remaining life of steam turbine rotor, method of evaluating remaining life of steam turbine rotor, rotor blade and steam turbine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To propose a device for evaluating a remaining life of a steam turbine rotor and a method of evaluating the remaining life of the steam turbine rotor for non-destructively evaluating strength and a remaining life time of blade mounting portions of the steam turbine rotor, which form a stress concentration zone, in the steam turbine rotor having unknown composition components without causing a problem in subsequent operation. <P>SOLUTION: In the steam turbine rotor 10 having unknown composition components, metal material forming the steam turbine rotor 10 is specified by specifying the composition components. Current strength of the steam turbine rotor 10 can be specified and a remaining life time can be estimated by comparing information on the specified metal material and service temperature, stress and operating time of the steam turbine rotor 10 with strength specification data stored in a storage section 103. The remaining life can be non-destructively evaluated without causing a problem in the subsequent operation of the steam turbine rotor 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a steam turbine rotor remaining life evaluation apparatus and a steam turbine rotor remaining life evaluation method that non-destructively specifies the strength and remaining life time of a steam turbine rotor for a steam turbine rotor whose composition component is unknown. . Furthermore, the present invention relates to a moving blade designed for the steam turbine rotor based on the result of the remaining life evaluation of the steam turbine rotor, and a steam turbine including the moving blade.

In the conventional method for evaluating the strength and remaining life of turbine blades in an aged plant, the turbine blades are extracted from the aged plant, test pieces for strength evaluation are taken from the extracted turbine blades, and an actual strength test is performed. A fracture evaluation method is used in which comparative evaluation between test data and strength data of a material created using an unused blade is used.
In addition, in the case where it is impossible to collect a test piece from the extracted turbine blade, for example, the local composition distribution, hardness distribution, and structure of the stress concentration portion of the turbine blade or the portion where deterioration is most advanced at the highest temperature. Changes are measured, and these measurement data are compared with the strength data of materials created using unused blades to estimate the current turbine blade strength and remaining life time ( For example, see Patent Document 1.)

On the other hand, in the case of a turbine rotor, it is difficult to collect a test piece for strength and composition analysis from the turbine rotor, so the destructive test and local composition distribution measurement used in the turbine blades described above should be performed. I can't. Furthermore, in the case of a turbine rotor, the stress concentration portion to be evaluated is often not the turbine rotor surface, so the hardness distribution and the structural change of the portion to be evaluated cannot be measured, and the strength and remaining life time Is impossible to estimate. Here, a method using magnetic AE (Acoustic Emission) is disclosed as a method for predicting the non-destructive strength and remaining life of the turbine rotor. In this method as well, a local stress concentration portion inside the turbine rotor is also disclosed. It is difficult to predict the strength and the remaining life time (see, for example, Patent Document 2).
JP-A-8-105882 JP-A-6-58911

  For example, when evaluating the strength and remaining life time of the stress concentration part in the blade implantation part located inside the turbine rotor using the conventional blade blade strength and remaining life evaluation method of the conventional aging plant, the turbine rotor is destroyed. Without doing so, there was a problem that the evaluation could not be performed without any trouble in the subsequent operation of the turbine rotor.

  Furthermore, in the conventional strength and remaining life evaluation method described above, since the data of the unused material of the same material as the existing turbine rotor material is used as a comparison reference, when the composition of the existing turbine rotor material is unknown, a database to be referred to There is also a problem that the strength and the remaining life time of the existing turbine rotor cannot be evaluated.

  Therefore, the present invention was made to solve the above-mentioned problems, and in the steam turbine rotor whose composition component is unknown, the strength and remaining life time of the blade turbine rotor blade implantation portion that becomes the stress concentration portion, It is an object of the present invention to propose a steam turbine rotor remaining life evaluation apparatus and a steam turbine rotor remaining life evaluation method that perform nondestructive evaluation without hindering subsequent operations. It is another object of the present invention to propose a moving blade designed for the steam turbine rotor and a steam turbine including the moving blade based on the result of the remaining life evaluation of the steam turbine rotor.

  In order to achieve the above object, a steam turbine rotor remaining life evaluation apparatus according to the present invention is a remaining life evaluation apparatus that non-destructively evaluates the life of at least a steam turbine rotor whose composition component is unknown. Storage means storing strength specifying data for determining the strength of the steam turbine rotor based on the operating conditions of the steam turbine rotor according to various metal materials constituting the turbine rotor, and the composition of the steam turbine rotor A composition analyzer for analyzing components nondestructively; input means for inputting predetermined operating conditions of the steam turbine rotor; and a metal material constituting the steam turbine rotor identified based on the analyzed composition components , Based on the input predetermined operating conditions and the strength specifying data, the current strength of the steam turbine rotor Characterized by comprising an evaluation means for evaluating the beauty remaining lifetime time.

  The remaining life evaluation method for a steam turbine rotor according to the present invention is a remaining life evaluation method for nondestructively evaluating the life of at least a steam turbine rotor whose composition component is unknown. A storage step for storing operating conditions in a storage means; a composition analysis step for non-destructively analyzing composition components of the steam turbine rotor; and a metal material constituting the steam turbine rotor based on the analyzed composition components The steam is determined according to the specified metal material specifying step, the specified metal material, the stored predetermined operating condition, and various metal materials constituting the steam turbine rotor stored in the storage means. Based on the strength specifying data for determining the strength based on the operating conditions of the turbine rotor, the current status of the steam turbine rotor Characterized by comprising an evaluation step of evaluating the strength and remaining life time.

  Here, examples of operating conditions of the steam turbine rotor for specifying the strength specifying data include operating temperature, stress, and operating time. Further, the predetermined operating conditions of the input steam turbine rotor include at least the use temperature, stress, and operating time of the steam turbine rotor. Note that these operating conditions are not limited to the above-exemplified items, but include items necessary for specifying the strength specifying data or for evaluating the current strength and remaining life time of the steam turbine rotor. .

  According to these steam turbine rotor remaining life evaluation devices and remaining life evaluation methods, in a steam turbine rotor whose composition component is unknown, the composition material is specified nondestructively and the metal material constituting the steam turbine rotor is specified. Based on the specified metal material and the predetermined operating condition of the steam turbine rotor, the predetermined strength specifying data can be specified in comparison with the strength specifying data stored in the storage means. Then, the current strength of the steam turbine rotor can be specified from the predetermined strength specifying data, and the remaining life time can be estimated.

  The remaining life evaluation device for a steam turbine rotor according to the present invention is a remaining life evaluation device for nondestructively evaluating the life of at least a steam turbine rotor whose composition component is unknown, and various types of components constituting the steam turbine rotor. Storage means for storing hardness specifying data for determining the hardness of the steam turbine rotor on the basis of the operating conditions of the steam turbine rotor according to the metal material, and non-destructive composition components of the steam turbine rotor A composition analysis device for analyzing automatically, an input means for inputting a predetermined operating condition of the steam turbine rotor, a hardness detection device for nondestructively detecting the hardness of a predetermined portion of the surface of the steam turbine rotor, The metal material constituting the steam turbine rotor specified based on the analyzed composition component, the input predetermined operating condition, the detected Hardness, and on the basis of the hardness specific data, and characterized in that and a evaluation means for evaluating said steam turbine rotor hardness and remaining life time of the current.

  Further, the remaining life evaluation method for a steam turbine rotor according to the present invention is a remaining life evaluation method for non-destructively evaluating the life of at least a steam turbine rotor whose composition component is unknown, and at least the input steam turbine rotor A storage step for storing predetermined operating conditions in a storage means, a composition analysis step for nondestructively analyzing composition components of the steam turbine rotor, and configuring the steam turbine rotor based on the analyzed composition components A metal material specifying step for specifying a metal material; a hardness detection step for nondestructively detecting the hardness of a predetermined portion of the surface of the steam turbine rotor; the specified metal material; and the stored predetermined operation Depending on the conditions, the detected hardness, and various metal materials constituting the steam turbine rotor stored in the storage means. And an evaluation step for evaluating the current hardness and remaining life time of the steam turbine rotor based on hardness specifying data for determining the hardness based on the operating conditions of the steam turbine rotor. Features.

  Here, examples of operating conditions of the steam turbine rotor for specifying the hardness specifying data include operating temperature, stress, and operating time. In addition, the input operating conditions of the steam turbine rotor include at least the operating temperature and stress of the steam turbine rotor. Note that these operating conditions are not limited to the above-exemplified items, but are items necessary for specifying hardness specifying data or for evaluating the current hardness and remaining life time of the steam turbine rotor. Shall be included.

  According to these steam turbine rotor remaining life evaluation devices and remaining life evaluation methods, in a steam turbine rotor whose composition component is unknown, the composition material is specified nondestructively and the metal material constituting the steam turbine rotor is specified. , Nondestructively detecting the hardness of a predetermined portion of the surface of the steam turbine rotor, and specifying the hardness stored in the storage means based on the specified metal material and the predetermined operating condition of the steam turbine rotor In comparison with the data, predetermined hardness specifying data can be specified. Furthermore, the current hardness of the steam turbine rotor can be specified using the specified hardness specifying data and the detected hardness, and the remaining life time can be estimated.

  The remaining life evaluation device for a steam turbine rotor according to the present invention is a remaining life evaluation device for nondestructively evaluating the life of at least a steam turbine rotor whose composition component is unknown, and various types of components constituting the steam turbine rotor. Storage means for storing hardness specifying data for determining the hardness of the steam turbine rotor on the basis of the operating conditions of the steam turbine rotor according to the metal material, and non-destructive composition components of the steam turbine rotor A composition analysis device for analyzing automatically, an input means for inputting a predetermined operating condition of the steam turbine rotor, a hardness detection device for nondestructively detecting the hardness of a predetermined portion of the surface of the steam turbine rotor, A shape measuring device that three-dimensionally measures the shape of a predetermined part of the steam turbine rotor, and the steam turbine specified based on the analyzed composition component Based on the metal material constituting the bin rotor, the detected hardness, the shape of the measured steam turbine rotor, and the input predetermined operating condition, the temperature and stress of the predetermined part of the steam turbine rotor are analyzed. Based on the analyzed metal material, the identified metal material, the analyzed temperature and stress, the detected hardness, and the hardness identification data, the current hardness and remaining life time of the steam turbine rotor And an evaluation means for evaluating.

  The remaining life evaluation method for a steam turbine rotor according to the present invention is a remaining life evaluation method for nondestructively evaluating the life of at least a steam turbine rotor whose composition component is unknown. A storage step for storing predetermined operating conditions in a storage means; a composition analysis step for non-destructively analyzing composition components of the steam turbine rotor; and a metal constituting the steam turbine rotor based on the analyzed composition components A metal material specifying step for specifying a material, a hardness detecting step for nondestructively detecting the hardness of a predetermined portion of the surface of the steam turbine rotor, and a shape of the predetermined portion of the steam turbine rotor are three-dimensionally measured. A shape measuring step, the identified metal material, the detected hardness, the stored predetermined operating condition, and the measurement An analysis step of analyzing a temperature and stress of a predetermined portion of the steam turbine rotor based on the shape of the steam turbine rotor, the identified metal material, the analyzed temperature and stress, and the detected hardness And based on hardness specifying data for determining hardness based on operating conditions of the steam turbine rotor in accordance with various metal materials constituting the steam turbine rotor stored in the storage means, And an evaluation step for evaluating the current hardness and remaining life time of the steam turbine rotor.

  Here, examples of operating conditions of the steam turbine rotor for specifying the hardness specifying data include operating temperature, stress, and operating time. Further, the predetermined operating conditions of the input steam turbine rotor include at least the use temperature, stress, and operating time of the steam turbine rotor. The predetermined operating conditions may be, for example, the operating temperature of the steam turbine rotor and stress load history data at predetermined operating time intervals, and are necessary for setting and analyzing initial conditions and boundary conditions in the analysis of thermal stress. The data format may satisfy various conditions. Note that these operating conditions are not limited to the above-exemplified matters, but for specifying the hardness specifying data, for analyzing the temperature and stress of a predetermined part of the turbine rotor, or for the current hardness of the steam turbine rotor. It includes matters necessary for evaluating the life and remaining life time.

  According to these steam turbine rotor remaining life evaluation devices and remaining life evaluation methods, in a steam turbine rotor whose composition components are unknown, the metal components constituting the steam turbine rotor are specified by specifying the composition components nondestructively. In addition, the hardness of a predetermined portion of the surface of the steam turbine rotor can be detected nondestructively. Furthermore, the metal material which measures the shape and dimension of the predetermined | prescribed site | part of a steam turbine rotor three-dimensionally, comprises an analysis model based on this three-dimensionally measured information, and comprises the identified steam turbine rotor The thermal analysis and the thermal stress analysis can be performed based on information such as the hardness of the surface of the predetermined portion of the steam turbine rotor and the predetermined operating condition of the steam turbine rotor. As a result, it is possible to obtain information on temperature and stress under a predetermined condition in a predetermined portion, in particular, a stress concentration portion existing inside the steam turbine rotor where it is difficult to actually measure temperature and stress. Furthermore, based on the temperature and stress obtained by this analysis, information on the specified metal material, in comparison with the hardness specification data stored in the storage means, specified predetermined hardness specification data, Using the detected hardness, the current hardness of the steam turbine rotor can be specified, and the remaining lifetime can be estimated.

  According to the steam turbine rotor remaining life evaluation device and the steam turbine rotor remaining life evaluation method of the present invention, in the steam turbine rotor whose composition component is not known, the strength of the blade turbine rotor blade implantation portion or the like that becomes the stress concentration portion, and The remaining lifetime can be evaluated non-destructively without hindering subsequent operations.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, parts having the same configuration are denoted by the same reference numerals, and redundant description is simplified or omitted. Here, the remaining life evaluation part will be described by taking a blade implantation part as an example and taking one of many shapes as an example.

(First embodiment)
A steam turbine rotor remaining life evaluation apparatus 100 according to a first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a cross-sectional view of a steam turbine rotor 10 in which a blade implantation part 11 having a substantially cross-shaped cross section is formed. FIG. 2 is a schematic diagram showing the configuration of the remaining life evaluation apparatus 100 for the steam turbine rotor.

  As shown in FIG. 1, in the circumferential direction of the steam turbine rotor 10, a blade implantation part 11 having a substantially cross-shaped cross section is provided. Turbine blades are sequentially planted in the blade implantation portion 11, and the planted turbine blades are mechanically fastened, connected and arranged. In the steam turbine rotor 10 including the blade implantation portion 11 having such a shape, for example, the stress concentration portion 12 exists in the vicinity of the end portion of the cross-shaped lateral groove formed along the steam turbine rotor 10 of the blade implantation portion 11. .

  The steam turbine rotor remaining life evaluation apparatus 100 shown in FIG. 2 mainly includes a composition analysis apparatus 101, a control unit 102, a storage unit 103, and an input unit 104. The control unit 102 is connected to the composition analyzer 101, the storage unit 103, and the input unit 104 so that information can be input and output.

  The composition analysis device 101 is a device that analyzes the composition components of the steam turbine rotor 10 in a non-destructive and non-contact manner. The composition analyzer 101 can analyze composition components and their contents based on the wavelength and intensity of fluorescent X-rays emitted from an analysis object, for example, by irradiating the analysis object with X-rays. By applying appropriate energy to the fluorescent X-ray analysis or the analyte, the atoms are evaporated and emitted, and the components and their contents are determined based on the wavelength and intensity obtained by spectroscopic analysis of the emission. An apparatus using an emission spectroscopic analysis that can be analyzed is used.

  The control unit 102 is mainly composed of an arithmetic unit (CPU), a read-only memory (ROM), a random access memory (RAM), and the like. The CPU uses various programs and data stored in the ROM and RAM. Perform arithmetic processing. Further, as described above, the control unit 102 can communicate information with each component constituting the remaining life evaluation apparatus 100 of the steam turbine rotor, and controls the operation of each component. Furthermore, the control unit 102 also functions as an evaluation unit.

  The storage unit 103 functions as a storage unit, and includes, for example, a memory or a hard disk having a predetermined capacity. In the storage unit 103, for example, information on various metal materials assumed as the metal material constituting the steam turbine rotor 10 and the use temperature, stress, and operation time of the steam turbine rotor 10 according to the various metal materials. The intensity specifying data indicating the relationship between the intensity specified based on the operation time and the like is stored. Here, as the strength, for example, creep strength, high cycle fatigue strength, low cycle fatigue strength, and the like are listed, and strength specifying data is stored for each of these strengths. The information stored in the storage unit 103 is not limited to these, and can be set as appropriate. Further, for example, information such as the current strength and remaining life time of the steam turbine rotor 10 whose remaining life has been evaluated may be stored in the storage unit 103. Furthermore, a display unit such as a monitor may be connected to the storage unit 103 and, for example, various parameters such as a result of remaining life evaluation and a measurement result used for remaining life evaluation may be displayed on the display unit.

  The input unit 104 inputs at least the operating temperature, stress, operating time, and the like of the steam turbine rotor 10 and includes, for example, a keyboard. The information input by the input unit 104 is input by the input unit of the remaining life evaluation device 100 for the steam turbine rotor and stored in the storage unit 103.

  Next, the operation of the remaining life evaluation apparatus 100 for the steam turbine rotor will be described with reference to FIG.

  FIG. 3 is a flowchart for explaining the operation of the remaining life evaluation apparatus 100 for the steam turbine rotor. Here, the operating temperature, stress, and operating time information of the steam turbine rotor 10 input by the input unit 104 has already been input to the storage unit 103 of the remaining life evaluation apparatus 100 of the steam turbine rotor. Will be described.

  First, the control unit 102 operates the composition analyzer 101 based on the input signal for starting the remaining life evaluation. The composition analyzer 101 analyzes the composition component in a predetermined part of the steam turbine rotor 10 and outputs the result to the control unit 102 (step S110).

  Subsequently, the control unit 102 compares and contrasts the analysis result output from the composition analysis apparatus 101 with information on various metal materials assumed as the metal material constituting the steam turbine rotor 10 stored in the storage unit 103. Then, the metal material constituting the steam turbine rotor 10 is specified (step S111).

  Subsequently, the control unit 102 reads the input use temperature, stress, and operation time of the steam turbine rotor 10 from the storage unit 103. Further, the use of the steam turbine rotor 10 according to the various metal materials stored in the storage unit 103 based on the read use temperature, stress, operation time, and information on the metal material specified in step S111. Predetermined intensity specifying data is specified in comparison with intensity specifying data indicating the relationship between the intensity specified based on temperature, stress, and operating time and the operating time. Then, the current strength of the steam turbine rotor 10 is specified from the predetermined strength specifying data, and the remaining life time is estimated (step S112). The remaining life of the steam turbine rotor 10 is preferably evaluated for the stress concentration portion 12 as shown in FIG. 1. For example, the operating temperature and the stress value are estimated as values in the stress concentration portion 12. It is desirable to use a different value.

  Here, the evaluation method of the current strength and remaining lifetime will be described with reference to FIG.

  FIG. 4 shows the relationship between the operating time and the strength according to a predetermined operating temperature, stress, and operating time of the steam turbine rotor 10 composed of, for example, steel type A, steel type B, or steel type C.

  As shown in FIG. 4, a characteristic line showing the relationship between operating time and strength can be obtained in accordance with the metal material constituting the steam turbine rotor 10 under a predetermined use temperature and stress. For example, if the metal material constituting the steam turbine rotor 10 is specified as the steel type C in FIG. 4, the strength decreases along with the operation time along the characteristic line of the steel type C. Here, the current strength is specified as the strength at the current operating time of the steam turbine rotor. Furthermore, the time when the characteristic line of the steel type C reaches the preset limit strength of the steel type C is estimated as the life time, and the time obtained by subtracting the current operation time from this life time corresponds to the remaining life time. .

  Here, examples of the strength shown on the vertical axis of FIG. 4 include creep strength, high cycle fatigue strength, low cycle fatigue strength, and the like, and the current strength can be specified in each of these strengths. Further, in each of these strengths, it is preferable that the shortest time among the remaining lifetime estimated by the above-described method is the remaining lifetime of the steam turbine rotor 10 from the viewpoint of safety.

  In addition, by analyzing the composition components in step S110, minute damage (such as arc discharge marks), so-called measurement marks, may be formed on the surface of the steam turbine rotor 10. Such a measurement mark is very unlikely to hinder the subsequent operation of the steam turbine, but it may become a starting point of cracking in a stress concentrated part or the like. It is preferable to polish, remove and repair.

  According to the steam turbine rotor remaining life evaluation apparatus 100 and the remaining life evaluation method in the first embodiment, in the steam turbine rotor 10 with unknown composition components, the composition components are specified nondestructively and the steam turbine rotor 10. Can be specified. Further, based on the information on the specified metal material and the use temperature, stress, and operating time of the steam turbine rotor 10, predetermined strength specifying data is compared with the strength specifying data stored in the storage unit 103. Can be identified. Then, the current strength of the steam turbine rotor 10 can be specified from the predetermined strength specifying data, and the remaining life time can be estimated. Further, according to this remaining life evaluation method, the remaining life can be evaluated nondestructively without hindering the subsequent operation of the steam turbine rotor 10.

(Second Embodiment)
A steam turbine rotor remaining life evaluation apparatus 200 according to a second embodiment of the present invention will be described with reference to FIGS.

  FIG. 5 is a schematic diagram showing the configuration of the remaining life evaluation apparatus 200 for the steam turbine rotor. FIG. 6 is a flowchart for explaining the operation of the remaining life evaluation apparatus 200 for the steam turbine rotor.

  The steam turbine rotor remaining life evaluation apparatus 200 shown in FIG. 5 mainly includes a composition analysis apparatus 101, a control unit 102, a storage unit 103, an input unit 104, and a hardness detection device 201. The control unit 102 is connected to the composition analyzer 101, the storage unit 103, the input unit 104, and the hardness detection device 201 so that information can be input and output.

  The hardness detection device 201 detects the hardness of the surface of the steam turbine rotor 10, and the hardness detection is performed nondestructively so as not to hinder the subsequent operation of the steam turbine rotor 10. As the hardness detection method in the hardness detection device 201, a hardness test method using a static load or a hardness test method using a dynamic load is adopted. For example, Brinell hardness tester, Vickers hardness tester, Rockwell hardness tester, etc. The hardness detector 201 can be configured by any one of these hardness meters. In addition, as a hardness tester adopting a hardness test method by dynamic load, that is, an elastic deformation strength test method by falling objects, for example, a shore hardness meter, an eco-chip hardness meter, a hardness tester, an ultrasonic hardness The hardness detection apparatus 201 can also be comprised with either of these hardness gauges.

  The storage unit 103 stores, for example, information on various metal materials assumed as metal materials constituting the steam turbine rotor 10. Further, the storage unit 103 stores hardness specifying data indicating the relationship between hardness and operation time according to various metal materials based on the use temperature, stress, and operation time of the steam turbine rotor 10. The information stored in the storage unit 103 is not limited to these, and can be set as appropriate. For example, information such as the current strength and remaining life time of the steam turbine rotor that has been evaluated for remaining life is stored. May be.

  The input unit 104 inputs at least the operating temperature, stress, and the like of the steam turbine rotor 10 and includes, for example, a keyboard.

  Next, the operation of the remaining life evaluation apparatus 200 for the steam turbine rotor will be described with reference to FIG. Here, it is assumed that the operating temperature and stress information of the steam turbine rotor 10 input by the input unit 104 has already been input to the storage unit 103 of the remaining life evaluation device 200 of the steam turbine rotor. .

  First, the control unit 102 operates the composition analyzer 101 based on the input signal for starting the remaining life evaluation. The composition analyzer 101 analyzes the composition component in the predetermined part of the steam turbine rotor 10 and outputs the result to the control unit 102 (step S210).

  Subsequently, the control unit 102 compares and contrasts the analysis result output from the composition analysis apparatus 101 with information on various metal materials assumed as the metal material constituting the steam turbine rotor 10 stored in the storage unit 103. The metal material constituting the steam turbine rotor 10 is specified (step S211).

  Subsequently, the control unit 102 operates the hardness detection device 201. The hardness detection apparatus 201 detects the hardness of the surface of the predetermined part of the steam turbine rotor 10 and outputs the result to the control unit 102 (step S212).

  In addition, the process of step S210 and step S212 is not restricted to being processed in this order, You may perform a reverse order. Furthermore, the processing of step S210 and step S212 may be performed at the same time if the measurement is not hindered.

  Subsequently, the control unit 102 reads the input operating temperature and stress of the steam turbine rotor 10 from the storage unit 103. Further, based on the read use temperature and stress and the information on the metal material specified in step S211, the hardness indicating the relationship between the hardness and the operation time corresponding to various metal materials stored in the storage unit 103. Compare and contrast with specific data. And the characteristic line which shows the relationship between the hardness corresponding to the specified metal material and operation time as shown in FIG. 7 is obtained. Further, the hardness detection result is located on this characteristic line (point P in FIG. 7), and the operating time at that hardness (the operating time corresponding to point P in FIG. 7) is the current operating time. . The time when the characteristic line reaches the preset limit hardness is estimated as the life time, and the time obtained by subtracting the above-described current operation time from this life time corresponds to the remaining life time (step S213). ).

  Here, there is a correlation between the hardness and the strength of the surface of the steam turbine rotor 10, and the relationship between the strength and the operating time may be shown based on the relationship between the hardness and the operating time shown in FIG. it can. In addition, examples of the strength include creep strength, high cycle fatigue strength, low cycle fatigue strength, and the like. When estimating the remaining life time at each of these strengths, the shortest time is selected from the viewpoint of safety. The remaining life time of the steam turbine rotor 10 is preferably set.

  Further, by analyzing the composition components in step S210 and detecting the surface hardness in step S212, minute damage (such as indentations and arc discharge marks), so-called measurement marks, is formed on the surface of the steam turbine rotor 10. There is. Such a measurement mark is very unlikely to hinder the subsequent operation of the steam turbine, but it may become a starting point of cracking in a stress concentrated part or the like. It is preferable to polish, remove and repair.

  According to the remaining life evaluation apparatus 200 and the remaining life evaluation method of the steam turbine rotor in the second embodiment, the steam turbine rotor 10 is configured to specify the composition components nondestructively in the steam turbine rotor 10 whose composition components are unknown. Further, the hardness of a predetermined portion of the surface of the steam turbine rotor can be detected nondestructively. Further, based on the information on the specified metal material and the operating temperature and stress of the steam turbine rotor 10, the specified hardness specifying data is specified in comparison with the hardness specifying data stored in the storage unit 103. Then, the current hardness of the steam turbine rotor 10 can be specified using the detected hardness, and the remaining life time can be estimated. In the remaining life evaluation apparatus 200 and the remaining life evaluation method in the second embodiment, the hardness on the actual surface of the steam turbine rotor 10 is detected using the hardness detection apparatus 201, and the detection result is used. Since the remaining life time is evaluated, a more reliable evaluation can be performed. Further, according to this remaining life evaluation method, the remaining life can be evaluated nondestructively without hindering the subsequent operation of the steam turbine rotor 10.

(Third embodiment)
A steam turbine rotor remaining life evaluation apparatus 300 according to a third embodiment of the present invention will be described with reference to FIGS.

  FIG. 8 is a schematic diagram showing the configuration of the remaining life evaluation apparatus 300 for the steam turbine rotor. FIG. 9 is a flowchart for explaining the operation of the remaining life evaluation apparatus 300 for the steam turbine rotor.

  The steam turbine rotor remaining life evaluation device 300 shown in FIG. 8 includes a composition analysis device 101, a control unit 102, a storage unit 103, an input unit 104, a hardness detection device 201, a shape measurement device 301, and an analysis device 302. It is configured. The control unit 102 is connected to the composition analysis device 101, the storage unit 103, the input unit 104, the hardness detection device 201, the shape measurement device 301, and the analysis device 302 so as to be able to input and output information.

  The shape measuring device 301 is a device that three-dimensionally measures the shape and dimensions of at least a predetermined portion of the steam turbine rotor 10 and employs a contact method or a non-contact method as a measurement method. The shape measuring device 301 using the contact method includes, for example, a multi-indirect type dimension measuring machine, and the shape measuring device 301 using the non-contact method includes, for example, a laser scanner or a digital camera. .

  The analysis device 302 includes a shape and size of a predetermined portion of the steam turbine rotor 10 measured by the shape measuring device 301, a metal material constituting the steam turbine rotor 10, hardness at a surface of the predetermined portion of the steam turbine rotor 10, steam turbine Thermal analysis is performed based on information such as load history data such as operating temperature, stress, and operating time in the rotor 10, temperature distribution analysis under a predetermined condition at a predetermined portion, and heat due to start / stop using the temperature distribution result. It is a device for stress analysis and stress analysis considering centrifugal force during operation.

  The storage unit 103 stores, for example, information on various metal materials assumed as metal materials constituting the steam turbine rotor 10. Further, the storage unit 103 stores hardness specifying data indicating the relationship between hardness and operation time according to various metal materials based on the use temperature, stress, and operation time of the steam turbine rotor 10. The information stored in the storage unit 103 is not limited to these, and can be set as appropriate. Further, the storage unit 103 may store information such as the current strength of the steam turbine rotor that has been evaluated for the remaining life and the remaining life time.

  The input unit 104 inputs at least load temperature data such as operating temperature, stress, and operating time in the steam turbine rotor 10 and can be configured by a keyboard or the like, for example. Further, the input unit 104 may function as an interface that connects the control device that manages the steam turbine and the control unit 102 so that information can be input and output. Note that the load history data includes at least the operating temperature and stress values for each predetermined operating time interval.

  Next, the operation of the remaining life evaluation apparatus 300 for the steam turbine rotor will be described with reference to FIG. Here, the load history data such as operating temperature, stress, and operating time of the steam turbine rotor 10 input by the input unit 104 has already been input to the storage unit 103 of the remaining life evaluation device 300 of the steam turbine rotor. It is explained as in

  First, the control unit 102 operates the composition analyzer 101 based on the input signal for starting the remaining life evaluation. The composition analyzer 101 analyzes the composition component at a predetermined portion of the steam turbine rotor 10 and outputs the result to the control unit 102 (step S310).

  Subsequently, the control unit 102 compares and contrasts the analysis result output from the composition analysis apparatus 101 with information on various metal materials assumed as the metal material constituting the steam turbine rotor 10 stored in the storage unit 103. Then, the metal material constituting the steam turbine rotor 10 is specified (step S311).

  Subsequently, the control unit 102 operates the hardness detection device 201. The hardness detection apparatus 201 detects the hardness of the surface of the predetermined part of the steam turbine rotor 10 and outputs the result to the control unit 102 (step S312).

  Subsequently, the control unit 102 operates the shape measuring device 301. The shape measuring device 301 measures the shape and dimensions of a predetermined portion of the steam turbine rotor 10 and outputs the information to the analyzing device 302 (step S313). Further, the shape measuring device 301 may output the measured information to the control unit 102 and store and manage the information in the storage unit 103 as shape information of a predetermined part in the steam turbine rotor 10.

  Note that the processes of step S310, step S312 and step S313 are not limited to being performed in this order, and any of them may be performed first. Furthermore, the processing of step S310, step S312 and step S313 may be performed at the same time if the measurement is not hindered.

  Subsequently, the control unit 102 sends information such as the specified metal material constituting the steam turbine rotor 10, the hardness of the surface of the predetermined portion of the steam turbine rotor 10, and load history data in the steam turbine rotor 10 to the analysis device 302. Output. Then, the analysis device 302 performs thermal analysis and thermal stress based on information output from the control unit 102 and information such as the shape and dimensions of a predetermined portion of the steam turbine rotor 10 measured by the shape measurement device 301. The analysis is performed to analyze the temperature and stress under a predetermined condition in a predetermined part, and the analysis result is output to the control unit 102 (step S314).

  Subsequently, the control unit 102 determines the hardness according to the various metal materials stored in the storage unit 103 based on the information on the metal material constituting the identified steam turbine rotor 10 and the analyzed temperature and stress. Contrast with hardness-specific data showing the relationship of operating time. Then, as in the case of the second embodiment, a characteristic line indicating the relationship between the hardness and the operating time corresponding to the specified metal material as shown in FIG. 7 is obtained. Further, the hardness detection result is substantially located on this characteristic line (point P in FIG. 7), and the operating time at that hardness (the operating time corresponding to point P in FIG. 7) is the current operating time. To do. The time when the characteristic line reaches the preset limit hardness is estimated as the life time, and the time obtained by subtracting the above-described current operation time from the life time corresponds to the remaining life time (step S315). ).

  Here, there is a correlation between the hardness and the strength of the surface of the steam turbine rotor 10, and the relationship between the strength and the operating time may be shown based on the relationship between the hardness and the operating time shown in FIG. it can. In addition, examples of the strength include creep strength, high cycle fatigue strength, low cycle fatigue strength, and the like. When estimating the remaining life time at each of these strengths, the shortest time is selected from the viewpoint of safety. The remaining life time of the steam turbine rotor 10 is preferably set.

  Further, by analyzing the composition components in step S310 and detecting the hardness of the surface in step S312, minute damage (indentation, arc discharge mark, etc.), so-called measurement marks, is formed on the surface of the steam turbine rotor 10. There is. Such a measurement mark is very unlikely to hinder the subsequent operation of the steam turbine, but it may become a starting point of cracking in a stress concentrated part or the like. It is preferable to polish, remove and repair.

  According to the steam turbine rotor remaining life evaluation apparatus 300 and the remaining life evaluation method in the third embodiment, in the steam turbine rotor 10 whose composition component is unknown, the composition component is specified nondestructively and the steam turbine rotor 10. Can be specified, and the hardness of a predetermined portion of the surface of the steam turbine rotor 10 can be detected nondestructively. Furthermore, the shape and dimension of the predetermined part of the steam turbine rotor 10 are measured three-dimensionally, an analysis model is constructed based on the information measured three-dimensionally, and the identified steam turbine rotor 10 is constructed. It is possible to perform thermal analysis and thermal stress analysis based on information such as load history data such as metal material, the hardness of the surface of a predetermined portion of the steam turbine rotor 10, operating temperature, stress, and operating time in the steam turbine rotor 10. it can. As a result, the temperature and stress under a predetermined condition in a predetermined portion, particularly a stress concentration portion or the like (for example, the stress concentration portion 12 in FIG. 1) existing in the steam turbine rotor 10 where it is difficult to actually measure temperature and stress. Information can be obtained.

  Further, based on the temperature and stress obtained by this analysis and information on the specified metal material, the specified hardness specifying data is specified by comparing with the hardness specifying data stored in the storage unit 103. Using the detected hardness, the current hardness of the steam turbine rotor 10 can be specified, and the remaining life time can be estimated. Thereby, evaluation with higher reliability can be performed. Further, according to this remaining life evaluation method, the remaining life can be evaluated nondestructively without hindering the subsequent operation of the steam turbine rotor 10.

(Fourth embodiment)
In the fourth embodiment of the present invention, based on information such as the remaining life time and strength of the steam turbine rotor 10 evaluated by the steam turbine rotor remaining life evaluation method of the first to third embodiments described above. An example of designing and exchanging the moving blade will be described with reference to FIG.

  In FIG. 10, in the first to third embodiments described above, the strength, hardness, remaining life time, and the like in the steam turbine rotor 10 are evaluated, and then the rotor blades and the like are designed based on the evaluation. A process diagram is shown.

  As shown in FIG. 10, for example, when replacing the moving blades based on the evaluated information such as the strength and remaining life time of the steam turbine rotor 10, the strength and remaining life of the blade implantation portion of the steam turbine rotor 10. Time is evaluated (step S400). As a result, if the remaining life time of the steam turbine rotor 10 is sufficient, it is possible to repair the steam turbine by replacing only the moving blades, thereby achieving a longer life (step S401). As a result, plant maintenance and repair costs can be significantly reduced. Furthermore, since the strength of the blade implantation part of the steam turbine rotor 10 can be grasped, the design (for example, weight reduction) and use of the moving blade corresponding to the strength of the current steam turbine rotor 10 are possible. (Step S401). Thereby, it is possible to improve the efficiency and extend the remaining life time without replacing the steam turbine rotor 10.

  In addition, by evaluating the remaining life time and strength of the steam turbine rotor 10 that is currently in use, it is useful for studying future repair plans for the steam turbine rotor 10 and improving the reliability of steam turbine operation. Can do.

  In the first to fourth embodiments described above, the remaining life time of the steam turbine rotor 10 is evaluated using the remaining life evaluation device and the remaining life evaluation method of the steam turbine rotor according to the present invention. As described above, utilization of the remaining life evaluation apparatus and method of the present invention is not limited to the steam turbine rotor 10. For example, the remaining life evaluation of each component of the steam turbine such as a moving blade, a stationary blade, and a casing can be performed using the remaining life evaluation apparatus and method of the present invention.

Sectional drawing of the steam turbine rotor in which the cross-sectional shape formed the substantially cruciform blade implantation part. The schematic diagram which shows the structure of the remaining life evaluation apparatus of the steam turbine rotor of 1st Embodiment. The flowchart for demonstrating operation | movement of the remaining life evaluation apparatus of the steam turbine rotor of 1st Embodiment. The figure which shows the relationship between an operating time and intensity | strength. The schematic diagram which shows the structure of the remaining life evaluation apparatus of the steam turbine rotor of 2nd Embodiment. The flowchart for demonstrating operation | movement of the remaining life evaluation apparatus of the steam turbine rotor of 2nd Embodiment. The figure which shows the relationship between hardness and an operating time. The schematic diagram which shows the structure of the remaining life evaluation apparatus of the steam turbine rotor of 3rd Embodiment. The flowchart for demonstrating operation | movement of the remaining life evaluation apparatus of the steam turbine rotor of 3rd Embodiment. The figure which shows the process for designing the moving blade etc. of 4th Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Steam turbine rotor, 100 ... Remaining life evaluation apparatus of a steam turbine rotor, 101 ... Composition analyzer, 102 ... Control part, 103 ... Memory | storage part, 104 ... Input part.

Claims (14)

A remaining life evaluation apparatus for nondestructively evaluating the life of at least a steam turbine rotor whose composition component is unknown,
Storage means for storing strength specifying data for determining the strength of the steam turbine rotor based on the operating conditions of the steam turbine rotor according to various metal materials constituting the steam turbine rotor;
A composition analyzer for nondestructively analyzing composition components of the steam turbine rotor;
Input means for inputting predetermined operating conditions of the steam turbine rotor;
Based on the metal material constituting the steam turbine rotor specified based on the analyzed composition component, the input predetermined operating condition, and the strength specifying data, the current strength and surplus of the steam turbine rotor are determined. An apparatus for evaluating the remaining life of a steam turbine rotor, comprising: an evaluation means for evaluating a life time. A remaining life evaluation apparatus for nondestructively evaluating the life of at least a steam turbine rotor whose composition component is unknown,
Storage means storing hardness specifying data for determining the hardness of the steam turbine rotor based on the operating conditions of the steam turbine rotor according to various metal materials constituting the steam turbine rotor;
A composition analyzer for nondestructively analyzing composition components of the steam turbine rotor;
Input means for inputting predetermined operating conditions of the steam turbine rotor;
A hardness detector that nondestructively detects the hardness of a predetermined portion of the surface of the steam turbine rotor;
Based on the metal material constituting the steam turbine rotor specified based on the analyzed composition component, the input predetermined operating condition, the detected hardness, and the hardness specifying data, the steam An evaluation device for evaluating the remaining life of a turbine rotor and an evaluation means for evaluating the remaining life time of the turbine rotor. A remaining life evaluation apparatus for nondestructively evaluating the life of at least a steam turbine rotor whose composition component is unknown,
Storage means storing hardness specifying data for determining the hardness of the steam turbine rotor based on the operating conditions of the steam turbine rotor according to various metal materials constituting the steam turbine rotor;
A composition analyzer for nondestructively analyzing composition components of the steam turbine rotor;
Input means for inputting predetermined operating conditions of the steam turbine rotor;
A hardness detector that nondestructively detects the hardness of a predetermined portion of the surface of the steam turbine rotor;
A shape measuring device that three-dimensionally measures the shape of the predetermined portion of the steam turbine rotor;
Based on the metal material constituting the steam turbine rotor identified based on the analyzed composition component, the detected hardness, the shape of the measured steam turbine rotor, and the input predetermined operating condition An analysis device for analyzing the temperature and stress of a predetermined portion of the steam turbine rotor;
Evaluation means for evaluating the current hardness and remaining life time of the steam turbine rotor based on the identified metal material, the analyzed temperature and stress, the detected hardness, and the hardness identification data An apparatus for evaluating the remaining life of a steam turbine rotor, comprising:   The remaining life of the steam turbine rotor according to any one of claims 1 to 3, wherein the composition analyzer is constituted by a fluorescent X-ray analyzer, a plasma emission analyzer, or an arc discharge emission analyzer. Evaluation device.   4. The remaining life evaluation device for a steam turbine rotor according to claim 2, wherein the hardness detection method in the hardness detection device is a hardness test method using a static load or a hardness test method using a dynamic load.   4. The remaining life evaluation device for a steam turbine rotor according to claim 3, wherein the measuring method in the shape measuring device is a contact method or a non-contact method.   It further comprises measurement mark removing means for removing the measurement mark formed on the surface of the steam turbine rotor in accordance with the analysis of the composition component by the composition analysis apparatus and / or the hardness detection by the hardness detection apparatus. The remaining life evaluation apparatus for a steam turbine rotor according to any one of claims 1 to 3, wherein A remaining life evaluation method for nondestructively evaluating the life of at least a steam turbine rotor whose composition component is unknown,
A storage step of storing in the storage means the input predetermined operating conditions of the steam turbine rotor;
A composition analysis step for non-destructively analyzing a composition component of the steam turbine rotor;
A metal material specifying step of specifying a metal material constituting the steam turbine rotor based on the analyzed composition component;
Based on the specified metal material, the stored predetermined operating condition, and the various metal materials constituting the steam turbine rotor stored in the storage unit, based on the operating condition of the steam turbine rotor. A remaining life evaluation method for a steam turbine rotor, comprising: an evaluation step for evaluating the current strength and remaining life time of the steam turbine rotor based on strength specifying data for determining strength. A remaining life evaluation method for nondestructively evaluating the life of at least a steam turbine rotor whose composition component is unknown,
A storage step of storing in the storage means at least a predetermined operating condition of the steam turbine rotor input;
A composition analysis step for non-destructively analyzing a composition component of the steam turbine rotor;
A metal material specifying step of specifying a metal material constituting the steam turbine rotor based on the analyzed composition component;
A hardness detection step for nondestructively detecting the hardness of a predetermined portion of the surface of the steam turbine rotor;
The steam turbine according to the specified metal material, the stored predetermined operating condition, the detected hardness, and various metal materials constituting the steam turbine rotor stored in the storage means. A steam turbine comprising: an evaluation step for evaluating the current hardness and remaining life time of the steam turbine rotor based on hardness specifying data for determining the hardness based on an operating condition of the rotor. Evaluation method for remaining life of rotor. A remaining life evaluation method for nondestructively evaluating the life of at least a steam turbine rotor whose composition component is unknown,
A storage step of storing in the storage means the input predetermined operating conditions of the steam turbine rotor;
A composition analysis step for non-destructively analyzing a composition component of the steam turbine rotor;
A metal material specifying step of specifying a metal material constituting the steam turbine rotor based on the analyzed composition component;
A hardness detection step for nondestructively detecting the hardness of a predetermined portion of the surface of the steam turbine rotor;
A shape measuring step for three-dimensionally measuring the shape of the predetermined portion of the steam turbine rotor;
Based on the identified metal material, the detected hardness, the stored predetermined operating condition, and the measured shape of the steam turbine rotor, the temperature and stress of the predetermined part of the steam turbine rotor are analyzed. An analysis step to perform,
The steam turbine rotor according to the identified metal material, the analyzed temperature and stress, the detected hardness, and various metal materials constituting the steam turbine rotor stored in the storage means. An evaluation step for evaluating the current hardness and remaining life time of the steam turbine rotor on the basis of hardness specifying data for determining the hardness based on the operating conditions of the steam turbine rotor Remaining life evaluation method.   It further comprises a measurement mark removing step of removing a measurement mark formed on the surface of the steam turbine rotor in accordance with the analysis of the composition component in the composition analysis step and / or the hardness detection in the hardness detection step. The remaining life evaluation method for a steam turbine rotor according to any one of claims 8 to 10, wherein the remaining life is evaluated.   A moving blade designed based on the current strength and remaining life time of a steam turbine rotor evaluated by the remaining life evaluation method of a steam turbine rotor according to any one of claims 8 to 11.   A steam turbine characterized by evaluating the current strength and remaining life time of a steam turbine rotor by the remaining life evaluation method for a steam turbine rotor according to any one of claims 8 to 11 when replacing a moving blade. . A moving blade designed based on the current strength and remaining life time of the steam turbine rotor evaluated by the remaining life evaluation method of the steam turbine rotor according to any one of claims 8 to 11,
A steam turbine comprising: the steam turbine rotor on which the moving blade is mounted.

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