JPH0835403A - Life consumption monitoring material testing device to which material test piece is attached - Google Patents

Abstract

PURPOSE:To enable the life and the remaining life of a material to creep to be estimated by the destructive test of a material test piece in stopping, by attaching the material test piece having a material equal to a material of a rotor and a casing of a steam turbine to a testing device, and arranging it in a turbine casing. CONSTITUTION:Tensile rods 41 having the coefficient of thermal expansion larger than that of a material test piece 30, and upper and lower horizontal plates 42 attached on end surfaces of the tensile rods 41, and brought in contact with a step surface 34 of a head 35 and a step surface 36 of the nut 37, and through which the grip parts 32, 33 penetrate are provided on both sides of a material test piece 30 wherein a head 35 and a nut 37 are respectively provided to a screw on grip parts 32, 33 on both ends. Moreover, a life consumption monitoring material testing device 40 wherein tensile stress of the maximum using stress is to be applied to the material test piece 30 by the thermal expansion difference between the material test piece 30 and the tensile rods 40 is attached to a turbine casing by an attaching bolt 45.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is installed in a turbine casing in order to estimate the life of a material such as a rotor and casing of a steam turbine against creep, fatigue, and the remaining life. The present invention relates to a life consumption monitoring material testing device to which a material test piece of material is attached.

[0002]

2. Description of the Related Art Materials such as rotors and casings of steam turbines deteriorate with long-term operation. Therefore, in order to monitor the deterioration of the materials, a material test piece of the same material as that of the rotors and casings is used. It is installed in the test equipment and installed in the passenger compartment of the steam turbine, taken out after a predetermined period of operation, and subjected to a destructive test of material test pieces to estimate the deterioration of materials such as the rotor and casing.

As a test device to which this kind of material test piece is attached, there is known a test device shown in FIG. 9 and a plan view taken in the direction of arrow P in FIG. 9 and 10, the material test piece 1 made of the same material as the rotor and casing of the steam turbine 1
The head 3 is provided on one grip portion 2 of the grip portions at both ends, and the screw 5 is provided on the other grip portion 4. The material test piece 1 is inserted into and penetrates an annular stress ring 6 into circular holes 9 and 10 having seats 7 and 8 and facing each other, and the head 3 passes through the Teflon sheet 11 and the stress ring. Seat 7 of 6
On the other hand, the screw 5 of the grip portion 4 of the material test piece 1 is screwed into the nut 12 seated on the seat 8 via the Teflon sheet 11, and the material test piece 1 is fixed by the nut 12 so that a predetermined stress is applied. Tightened.

Reference numeral 13 is a mounting bolt, and the test apparatus, to which the material test piece 1 to which the predetermined stress is applied by the stress ring 6 as described above by the mounting bolt 13, is mounted in the cabin of the steam turbine. Here, for example, the location shown in FIG. 11 is selected as the location where the test apparatus to which the material test piece is attached is installed in the steam turbine. In FIG. 11, a rotor 15 having a moving blade is an inner casing 1 having a stationary blade.
It is surrounded by 6,17. The outer casing 18 penetrates the rotor 15 and surrounds the inner casings 16 and 17. Incidentally, 19 and 20 are centering bolts for adjusting the positions of the inner casings 16 and 17.

The steam inflow path 21 is connected to a diffuser 23 following the valve seat of the steam control valve 22, and the steam that has passed through the steam control valve 22 is composed of moving blades of the rotor 15 and stationary blades of the inner casings 16 and 17. Lead to. In such a structure, the test apparatus equipped with the stress ring 6 shown in FIG. 9 to which the material test piece 1 is attached has a mounting bolt 13 between the point A of the steam inflow path 21 shown in the figure or between the inner casings 16 and 17. Is attached to the outer casing 18 at point B.

The material test piece 1 installed in the turbine casing as described above and subjected to a predetermined stress by the stress ring 6
Suffers from material deterioration in the environment due to corrosive steam that drives the steam turbine, thermal aging due to high temperature steam, and material deterioration due to creep. Therefore, at the time of stoppage after a predetermined period of operation, the test equipment is taken out and the material test piece 1 is subjected to a destructive test, so that the material deterioration of the rotor, casing, etc. of the steam turbine due to thermal aging, creep, etc. in a corrosive environment. Is estimated the effect of.

[0007]

SUMMARY OF THE INVENTION In the above prior art,
Since the stress value applied to the material test piece 1 by the stress ring 6 is constant, it is only possible to test the material deterioration due to thermal aging and creep due to high temperature steam flowing in the steam turbine. For this reason, the influence of material deterioration based on the operation history of steam turbine operation, start / stop, and load change is unknown, and it is possible to estimate the life and remaining life of the material such as the rotor and casing of the target steam turbine. There was a problem that I could not.

An object of the present invention is to install a material test piece of the same material as the material of the rotor or casing of the steam turbine in a test apparatus and install it in the passenger compartment of the steam turbine. It is an object of the present invention to provide a life-consumption monitoring material testing device equipped with a material test piece capable of estimating the life and remaining life of materials such as casings.

[0009]

In order to solve the above-mentioned problems, according to the present invention, a material test piece of the same material as the material of the rotor, casing, etc. of the steam turbine is attached to a test apparatus and installed in the turbine casing. , In the material consumption monitoring equipment for life consumption monitoring, which estimates the life and remaining life of material such as rotor, casing, etc. from the destructive test conducted by taking out the material test piece at the time of operation stop, each of the grips at both ends A material test piece facing inwardly and having a step surface perpendicular to the axis, and a tensile member which is arranged parallel to the material test piece on both sides of the material test piece with the same length and has a coefficient of thermal expansion larger than that of the material test piece. A horizontal plate made of the same material as the material test piece attached to both end surfaces of the rod and the pull rods on both sides of the rod and the material test piece that come in contact with the step surfaces of the grip portions on both sides. It consists of a Ranaru lifetime consumption monitoring material testing apparatus, which shall equip a mounting means for mounting the turbine casing.

Further, in the life consumption monitoring material testing device to which the above-mentioned material test piece is attached, the material test piece having step surfaces perpendicular to the axis and facing outwardly at the grips at both ends, and parallel to the material test piece. A compression rod having the same length of expansion on both sides of the material test piece and having a coefficient of thermal expansion smaller than that of the material test piece, and the grip portion of the material test piece penetrates to contact the step surfaces of the grip portions on both sides respectively. , And a life consumption monitoring material testing device consisting of a material test piece attached to each end surface of each compression rod on both sides and a horizontal plate of the same material,
An attachment means for attaching this to the turbine casing is provided.

In the material consumption monitoring device for monitoring the life and consumption, to which the above-mentioned material test piece is attached, the projections of the same height are provided on both ends of at least one of the horizontal plates through which the grips on both sides of the material test piece pass. It shall be provided and the pull rods shall be attached to the projections on both sides. Further, in the above-described life and consumption monitoring material testing device, protrusions of the same height are provided on both ends of at least one of the horizontal plates through which the grips on both sides of the material test piece pass, and the protrusions on both sides are provided. A compression rod shall be attached to each.

In the above-mentioned material consumption monitoring device for monitoring the life consumption, to which the material test piece is attached, the lateral plate or the lateral plate provided with the projection and the pull rod are made of the same material. In addition, in the life consumption monitoring material testing device to which the material test piece is attached, the lateral plate or the lateral plate provided with the projection and the compression rod are made of the same material. In the above, the material test piece shall have a parallel part which has a uniform cross section.

Further, the material test piece has an annular cutout at one location of a parallel portion having a uniform cross section.

[0014]

[Function] In order to estimate the life and remaining life of the material of the rotor, casing, etc. of the steam turbine installed in the passenger compartment of the steam turbine based on the operation history of the turbine, the material of the rotor, casing, etc., is installed in the turbine passenger compartment. A material test piece of the same material is attached to a life consumption monitoring material testing device and installed, and when the turbine is stopped for a predetermined period of time, it is taken out and a destructive test is performed.

In this case, the material test piece is prepared by providing stepped surfaces that face the grip portions at both ends of the material test piece inward and are perpendicular to the axis of the material test piece. Then, the life consumption monitoring material testing device is arranged in parallel with the material test piece on both sides thereof with pull rods having the same length and a coefficient of thermal expansion larger than that of the material test piece. A lateral plate made of the same material as the material test piece, which is in contact with the step surface of the grip portion and is attached to both end surfaces of the pull rods on both sides, is arranged. Then, the steam turbine is operated by operating the life consumption monitoring material testing device to which the material test piece is mounted in the turbine casing by the mounting means.
The material test piece and the tensile rod expand thermally according to the steam temperature in the operation history due to start / stop and load changes, but the thermal expansion coefficient of the tensile rod is larger than that of the material test piece, so the tensile rod expands more than the material test piece. The amount increases. Therefore,
A tensile stress due to a difference in thermal expansion is applied to the material test piece through a lateral plate made of the same material as the material test piece that contacts the inwardly facing step surface perpendicular to the axis of the test piece. Here, in the life-consumption monitoring material testing device, the coefficient of thermal expansion and the material are preliminarily set based on the rated use temperature of the steam in the vehicle compartment so that the tensile stress due to the difference in thermal expansion becomes the maximum use stress of the part subject to life-consumption monitoring in advance. The distance between the step surfaces of the test piece, that is, the length of the pull rod is selected.

By taking out the material consumption monitoring equipment for life monitoring with such a material test piece attached when the turbine is stopped and performing a destructive test of the material test piece, the life and residual life of the material of the rotor and casing of the steam turbine against tensile stress The life expectancy can be estimated. Here, by making the material test piece a test piece whose parallel portion has a uniform cross section, it is possible to estimate the life and the remaining life of the material of the rotor, the casing and the like against creep.

Further, by using the material test piece as a test piece having an annular notch at one location of its parallel portion, it is possible to estimate the life and the remaining life of the material such as the rotor and the casing against fatigue. Further, in the material consumption monitoring device for life consumption monitoring to which the material test piece is attached, the material test piece is prepared by providing the grip portions at both ends with stepped surfaces facing outward at right angles to the axis of the material test piece. And the life consumption monitoring material testing device is
A compression rod having a coefficient of thermal expansion smaller than that of the material test piece is arranged in parallel on both sides of the material test piece, and the grip portion of the material test piece penetrates to contact the step surface of the grip portion,
In addition, transverse plates made of the same material as the material test piece attached to both end faces of the compression rods on both sides are arranged. Then, by mounting the life consumption monitoring material testing device to which the material test piece is mounted in the turbine casing by the mounting means, the turbine is operated, and the material test is performed corresponding to the steam temperature in the history of operation, start / stop, and load change. The piece and the compression rod thermally expand, but since the coefficient of thermal expansion of the compression rod is smaller than that of the material test piece, the compression rod has a smaller thermal expansion amount than the material test piece. Therefore, a compressive stress due to the difference in thermal expansion is applied to the material test piece through the lateral plate that contacts the outwardly facing step surface perpendicular to the axis of the material test piece. Here, in the life-consumption monitoring material testing device, the coefficient of thermal expansion and the material are preliminarily set based on the rated operating temperature of the steam in the vehicle interior so that the compressive stress due to the difference in thermal expansion becomes the maximum working stress of the part subject to life-consumption monitoring in advance. The distance between the step surfaces of the test piece, that is, the length of the compression rod is selected.

The life consumption monitoring material testing device with such a material test piece attached is taken out when the turbine is stopped and a destructive test is performed on the material test piece to determine the life of the material such as the rotor and casing of the steam turbine against the compressive stress. The remaining life can be estimated. By using the above-mentioned material test piece whose parallel part has a uniform cross section or which has an annular notch in the parallel part, the former is for creep, the latter is for start / stop, load change. It is possible to estimate the life and remaining life of materials such as the rotor and casing due to fatigue due to temperature change due to.

It should be noted that, by providing a protrusion of the same material as that of the horizontal plate at the end of the horizontal plate and attaching the pull rod or compression rod to this protrusion, the stress applied to the material test piece can be determined by the difference in the coefficient of thermal expansion. Even if the same, the tensile or compressive stress applied to the material test piece can be adjusted to a stress smaller than the maximum operating stress when using the horizontal plate without the above-mentioned protrusions by the length of the tensile rod or the compression rod. The life and remaining life of the material against creep or fatigue can be estimated by the type of material test piece as described above at the target site where stress occurs.

Further, in the life consumption monitoring material testing apparatus, the horizontal plate and the pull rod or the compression rod having no protrusions at the both ends, and the horizontal plate having the protrusions at the both ends and the pull rod or the compression rod. Even if they are made of materials each having the same thermal expansion coefficient and integrated, the same effect as described above can be obtained.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a material consumption monitoring material testing device equipped with a material test piece according to a first embodiment of the present invention. In FIG. 1, the material test piece 30 has a parallel portion 31 having a uniform circular cross section, and grip portions 32 and 33 having circular cross sections larger than the cross sectional area of the parallel portion 31 at both ends.
The lower grip portion 32 has a head 35 having a step surface 34 facing inward at a right angle to the axis of the material test piece 30.
Further, a screw is provided on the upper grip portion 33, and a nut 37 forming a step surface 36 facing inward at a right angle to the axis of the material test piece 30 can be screwed. The material test piece 30 is the same material as the material of the rotor and casing of the steam turbine.

The material consumption monitoring device 40 for monitoring the life and consumption, to which the material test piece 30 is attached, is composed of a pull rod, a horizontal plate, etc. described below. The pull rod 41 has a coefficient of thermal expansion larger than that of the material test piece 30, and is arranged parallel to the material test piece 30 on both sides thereof with the same length. The upper and lower lateral plates 42 are made of the same material as the material test piece 30, and the material test piece 3 is provided at the center thereof.
It has a hole 43 into which the zero grip portions 32 and 33 are inserted. The lower horizontal plate 42 is configured such that the grip portion 32 of the material test piece 30 is inserted into the hole 43 and the head 3 of the grip portion 32 is inserted.
5 is attached to the lower end surfaces of the pull rods 41 on both sides in contact with the step surface 34 of the No. 5 bolts 44 made of the same material as the horizontal plate 42. On the other hand, in the upper horizontal plate 42, the grip portion 33 of the material test piece 30 is inserted into the hole 43, and is attached to the upper end surfaces of the pull rods 41 on both sides by bolts 44. And
In this state, the end surface of the nut 37 that forms the stepped surface 36 that faces inward is in contact with the lateral plate 42 so as not to apply a load, and the nut 37 is screwed into the grip portion 33.

Reference numeral 45 denotes a mounting bolt made of the same material as that of the horizontal plate 42, which penetrates the lower horizontal plate 42 and mounts the life consumption monitoring material testing device 40 in which the material test piece 30 is mounted in the cabin of the steam turbine. is there. The life consumption monitoring material testing device 40 with the material test piece 30 attached as described above is attached with the mounting bolt 45.
When installed in the turbine casing as shown in Fig. 1,
The material test piece 30 and the pull rod 41 thermally expand due to the steam temperature in the vehicle compartment during operation of the turbine, but the coefficient of thermal expansion of the pull rod 41 is larger than that of the material test piece 30, so that the material test piece 30 has the horizontal plate 42. A tensile stress is applied by a tensile load.

Here, in the life consumption monitoring material testing device 40, the coefficient of thermal expansion and the length of the pull rod 41 are selected in advance so that the tensile stress due to the difference in thermal expansion becomes the maximum working stress of the site to be monitored as described above. ing. As described above, the material test piece 30 is exposed to the high temperature steam accompanying the operation history by the operation of the steam turbine, and the material test piece 30 creeps.

Therefore, after a predetermined operation period, for example, at the time of stoppage in periodic inspection, the life consumption monitoring material testing device 40 is taken out and the material test piece 30 is subjected to a destructive test.
It is possible to estimate the life and remaining life of the monitored part against creep due to tensile stress of materials such as the rotor and casing. FIG. 2 is a sectional view of a material consumption monitoring material testing device with a material test piece attached thereto according to a second embodiment of the present invention. In FIG. 2, the material test piece 50 includes a parallel portion 51 having a uniform circular cross section,
It has grip portions 52 and 53 having circular cross sections with a larger cross-sectional area than the parallel portion 51 at both ends. An annular step 55 having a step surface 54 facing outward is formed in the middle of the lower grip portion 52 in a direction perpendicular to the axis of the material test piece 50, and in the middle of the upper grip portion 53, the axis line of the material test piece 50. It has an annular step 57 having a step surface 56 facing outward, at a right angle to.

The material consumption monitoring device 60 for monitoring the life and consumption for mounting the material test piece 50 is composed of a compression rod, a horizontal plate, etc., and its structure is as follows. The compression rod 61 has a coefficient of thermal expansion smaller than that of the material test piece 50, and is arranged parallel to the material test piece 50 on both sides thereof with the same length. The grip portion 52 of the material test piece 50 is inserted into the hole 43 of the lower horizontal plate 42 and comes into contact with the step surface 54 of the step 55 of the grip portion 52 so that the compression rods 6 on both sides are pressed.
It is attached to the lower end surface of 1 by a bolt 44. On the other hand, in the upper horizontal plate 42, the grip portion 53 of the material test piece 50 is inserted into the hole 43 and comes into contact with the step surface 56 of the step 57 of the grip portion 53, and the bolts 44 are attached to the upper end surfaces of the compression rods 61 on both sides.
Installed by.

As described above, the life consumption monitoring material testing device 60 with the material test piece 50 attached thereto is attached to the interior of the steam turbine shown in FIG. The material test piece 50 and the compression rod 61 thermally expand due to the steam temperature in the vehicle compartment during the operation of No. 1, but since the thermal expansion coefficient of the compression rod 61 is smaller than that of the material test piece 50, the material test piece 50 is affected by the compression load. Compressive stress is applied.

Here, in the life consumption monitoring material testing apparatus, the coefficient of thermal expansion and the length are selected in advance so that the compressive stress due to the difference in thermal expansion becomes the maximum working stress of the monitored part as described above. In this way, the material test piece 50 is exposed to the high temperature steam accompanying the operation history of the steam turbine, and the material test piece 50 creeps.

Therefore, after a predetermined operation period, for example, at the time of stoppage during periodic inspection, the life consumption monitoring material testing device 60 is taken out and the material test piece 50 is subjected to a destructive test, so that the compressive stress of the material of the rotor, casing, etc. It is possible to estimate the life and remaining life of the monitored part against creep. FIG.
FIG. 3 is a sectional view of a material consumption monitoring material testing device with a life test piece attached thereto according to an embodiment of the present invention. In the life consumption monitoring material testing device 62 of FIG. 3, the material test piece 30 is provided with the projections 63a of the same height protruding at right angles at the ends of the upper and lower lateral plates 63 of the same material. It is the same as FIG. 1 except that the horizontal plates 63 are attached to the upper and lower end surfaces of the pull rods 64 having the same length on both sides and having a thermal expansion coefficient of more than 30 via the projections 63a.

At this time, by selecting the length of the pull rod 64,
The tensile stress applied to the material test piece 30 can be adjusted to a tensile stress smaller than the above-mentioned maximum working stress. Therefore, the life consumption monitoring material testing device 62 to which such a material test piece 30 is attached is installed in the turbine casing, and the destructive test of the material test piece 30 is performed when the material test piece 30 is stopped as described above. It is possible to estimate the life for creep and the remaining life due to the tensile stress of the target site where the tensile stress corresponding to the tensile stress adjusted as described above occurs.

In this embodiment, the projections 63a are provided on the upper and lower horizontal plates 63, but the same effect can be obtained by providing the projections 63a on either one of the horizontal plates 63. FIG. 4 is a cross-sectional view of a material consumption monitoring material testing device equipped with a material test piece according to a fourth embodiment of the present invention. 4, the life / consumption monitoring material testing device 65 uses the horizontal plate 63 having the projection 63a in FIG. 3 to install a compression rod 66 having a smaller coefficient of thermal expansion than the material test piece 30 between the upper and lower projections 63a. It is the same as FIG. 2 except that it is attached.

At this time, by selecting the length of the compression rod 66,
The compressive stress applied to the material test piece 50 can be adjusted to a compressive stress smaller than the above-mentioned maximum use stress.
Therefore, the life consumption monitoring material testing device 65 to which the material test piece 50 is attached is installed in the turbine casing, and the destructive test of the material test piece 50 is carried out at the time of stop as described above. It is possible to estimate the life for creep and the remaining life due to the compressive stress in the target area where the compressive stress corresponding to the compressive stress applied by adjusting to is generated.

In this embodiment, the upper and lower lateral plates 63 are
Although the projections 63a are provided on each of the above, the same effect as described above can be obtained by providing the projections 63a on either side of the lateral plate 63. The upper and lower horizontal plates 42 in FIGS. 1 and 2 are made of the same material as the pull rod 41 and the compression rod 61, respectively, and the upper and lower projections 63a in FIGS.
Even if the horizontal plate 63 having the same is made of the same material as the pull rod 64 and the compression rod 66, respectively, the same effect as that of FIGS. 1 and 2 can be obtained.

FIG. 5 is a cross-sectional view of a material consumption monitoring device for life monitoring to which a material test piece according to a fifth embodiment of the present invention is attached.
In FIG. 5, the material test piece 70 having a notch instead of the material test piece 30 shown in FIG. 1 is attached to the life consumption monitoring material test device 40, which is the same as FIG. Here, the material test piece 70 has an annular notch 72 having a stress concentration coefficient corresponding to a stress concentration portion such as a rotor and a casing of a steam turbine in a central portion of a parallel portion 71 having a uniform circular cross section. .

The coefficient of thermal expansion and the length of the pull rod 41 are selected so that the material test piece 70 is subjected to the maximum working stress of the tensile stress of the monitored portion as described above. By attaching the life consumption monitoring material testing device 40 to which such a material test piece 70 is attached to the passenger compartment of the steam turbine, the life consumption monitoring material testing device 40 can operate the steam turbine, start / stop, and load change history. After that, the material test piece 70 is subjected to tensile stress due to the temperature change due to the difference in thermal expansion between the material test piece 70 and the tensile rod 41 due to the temperature change of the history.

Therefore, the material test piece 70 is subjected to material deterioration due to fatigue caused by a temperature change accompanying the operation history of the steam turbine. Therefore, after the steam turbine is operated for a predetermined period of time, for example, when the periodic inspection is stopped, the life consumption monitoring material testing device 40 is taken out and the material test piece 70 is subjected to a destructive test to pull the material of the rotor, casing, etc. of the steam turbine. It is possible to estimate the life and remaining life of the monitored part against fatigue due to stress.

FIG. 6 is a cross-sectional view of a material consumption monitoring material testing device equipped with a material test piece according to a sixth embodiment of the present invention.
In FIG. 6, a material test piece 70 having an annular notch 72 having a stress concentration coefficient as described above is attached instead of the material test piece 30 to the life consumption monitoring material test apparatus 60 shown in FIG. Is the same as. Here, the coefficient of thermal expansion and the length of the compression rod 61 are selected so that the material test piece 70 is subjected to the maximum operating stress of the compressive stress of the monitored portion as described above.

By thus mounting the life consumption monitoring material testing device 60 with the material test piece 70 mounted in the cabin of the steam turbine, the life consumption monitoring material testing device 60 operates, starts and stops the steam turbine, and changes the load. Through the history of
The material test piece 70 receives a compressive stress due to the temperature change due to the temperature change due to the history and the thermal expansion difference between the material test piece 70 and the compression rod 61.

Therefore, the material test piece 70 is subjected to material deterioration due to fatigue due to temperature change caused by the operation history of the steam turbine. Therefore, after the steam turbine is operated for a predetermined period, for example, when the periodic inspection is stopped, the life consumption monitoring material testing device 60 is taken out and the material test piece 70 is subjected to a destructive test to compress the material of the rotor and casing of the steam turbine. It is possible to estimate the life and remaining life of the monitored part against fatigue due to stress.

FIG. 7 is a sectional view of a material consumption monitoring device for life monitoring with a notched material test piece according to a seventh embodiment of the present invention. 7 is the same as FIG. 3 except that a material test piece 70 having a notch 72 is attached instead of the material test piece 30 to the life consumption monitoring material test device 62 shown in FIG. Here, in the same manner as in FIG. 3, the material test piece 70 is attached to the life consumption monitoring material testing device 62, and is attached to the turbine casing and is operated for a predetermined period of time, for example, when the periodic inspection is stopped,
By taking out the material test piece 70 and performing a destructive test, as described above, a compressive stress equivalent to the compressive stress applied to the material test piece 70 as described above is generated, and the fatigue life and fatigue margin due to the compressive stress of the target portion are generated. Life expectancy can be estimated.

FIG. 8 is a cross-sectional view of a material consumption monitoring material testing device to which a material test piece having a notch according to an eighth embodiment of the present invention is attached. In FIG. 8, a life consumption monitoring material testing device 65 shown in FIG. 4 is the same as FIG. 4 except that a material test piece 70 having a notch 72 is attached instead of the material test piece 30. Here, the material test piece 70 is attached to the life consumption monitoring material test device 65 in the same manner as in FIG. 4, and this is attached to the turbine casing, and after a predetermined period of operation, for example, when the periodic inspection is stopped, the material test piece 70 is taken out. By performing the destructive test with the material test piece 70 as described above, it is possible to estimate the fatigue life and the remaining life due to the compression stress of the target portion where the compression stress corresponding to the compression stress applied to the material test piece 70 is generated.

5 and 6, upper and lower lateral plates 4
2 is made of the same material as that of the pull rod 41 and the compression rod 61, respectively, and the upper and lower protrusions 63 in FIGS.
The horizontal plate 63 having a is a pull rod 64 and a compression rod 66, respectively.
Even if the same material is used, the same effect as that in FIGS. 5 and 6 can be obtained.

[0043]

As is apparent from the above description, according to the present invention, the material test piece having the parallel section of the uniform cross section made of the same material as that of the rotor, casing, etc. of the steam turbine has the above-mentioned structure. Life and consumption monitoring with a material test piece attached so that the tensile stress or compressive stress caused by the difference in thermal expansion between a tensile rod or compression rod having a different coefficient of thermal expansion becomes the maximum operating stress of the tensile stress or compressive stress at the monitored site. By installing a material testing device in the turbine casing, applying a tensile stress or a compressive stress due to the difference in thermal expansion to the material test piece during operation of the turbine, and taking out the material test piece at stop to perform a destructive test. It is possible to estimate the life of the material such as the casing against creep and the remaining life.

Further, a notch having a stress concentration coefficient corresponding to the stress concentration portion of the material such as the rotor and casing of the turbine is provided in the parallel portion of the uniform cross section, and a material test piece of the same material as that of the rotor and casing is provided. Installed in the above-mentioned material testing device for life consumption monitoring and installed in the turbine interior, apply tensile stress or compressive stress due to thermal expansion difference to the material test piece with a notch during turbine operation, and perform a destructive test of the material test piece at stop. By doing so, it is possible to estimate the fatigue life and the remaining life due to the temperature change caused by the operation history of the materials of the rotor and casing of the turbine.

In the above, the same effect as described above can be obtained even if the horizontal plate and the pull rod or the compression rod are made of the same material. In addition, in the above-mentioned material consumption monitoring material testing device, a horizontal plate is provided with a protrusion, and by adjusting the length of the tension rod or compression rod attached to this, the material test piece of the structure to be described later has a tensile force smaller than the maximum working stress. Installed in the turbine compartment so that stress or compressive stress can be applied to operate the turbine,
At the time of stop, the tensile stress or compression applied to the material test piece is adjusted by performing a destructive test on the material test piece having a parallel portion with a uniform cross section or the material test piece having a notch in the parallel portion. It is possible to estimate the life for fatigue and the remaining life for fatigue in the former material test piece and in the latter material test piece at the target site where tensile stress or compressive stress corresponding to the stress occurs.

With the above-described material consumption monitoring device for monitoring the life and consumption attached with the material test piece, the rotor, casing, etc. can be directly tested without destructive or non-destructive inspection.
It is possible to estimate the service life and remaining service life of the casing, etc., and to manage the service life consumption based on the service life, allowing more flexible operation of the equipment.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a life consumption monitoring material testing apparatus to which a material test piece according to a first embodiment of the present invention is attached and which causes tensile stress in the test piece.

FIG. 2 is a sectional view of a life consumption monitoring material testing apparatus to which a material test piece according to a second embodiment of the present invention is attached and which causes a compressive stress in the test piece.

FIG. 3 is a cross-sectional view of a life consumption monitoring material testing device in which a lateral plate of the life consumption monitoring material testing device of FIG. 1 according to a third embodiment of the present invention is provided with projections and material test pieces are attached.

FIG. 4 is a cross-sectional view of a life-consumption monitoring material testing device in which a lateral plate of the life-consumption monitoring material testing device of FIG. 2 according to the fourth embodiment of the present invention is provided with projections and material test pieces are attached.

5 is a cross-sectional view of a life consumption monitoring material testing device in which a material test piece having a cutout is attached instead of the material test piece in FIG. 1 according to Embodiment 5 of the present invention.

FIG. 6 is a cross-sectional view of a life consumption monitoring material testing device in which a material test piece having a cutout is attached instead of the material test piece in FIG. 2 according to Example 6 of the present invention.

FIG. 7 is a cross-sectional view of a life consumption monitoring material testing apparatus in which a material test piece having a cutout is attached instead of the material test piece in FIG. 3 according to Example 7 of the present invention.

FIG. 8 is a cross-sectional view of a life consumption monitoring material testing apparatus in which a material test piece having a cutout is attached instead of the material test piece in FIG. 4 according to Example 8 of the present invention.

FIG. 9 is a cross-sectional view of a conventional material consumption monitoring device for life monitoring with a material test piece attached.

FIG. 10 is a plan view taken along the arrow P of FIG.

FIG. 11 is a partial cross-sectional view of a steam turbine exemplifying a passenger compartment in which a material consumption monitoring material testing device with a material test piece is installed.

[Explanation of symbols]

 30 material test piece 31 parallel part 32 gripping part 33 gripping part 40 life consumption monitoring material testing device 41 tensile rod 42 lateral plate 50 material test piece 51 parallel part 52 gripping part 53 gripping part 60 life consumption monitoring material testing device 61 compression rod 62 Life consumption monitoring material testing device 63 Lateral plate 63a Projection body 64 Tension rod 65 Life consumption monitoring material testing device 66 Compression rod 70 Material test piece 71 Parallel part 72 Notch

Claims (10)

[Claims] 1. A material test piece made of the same material as a material for a rotor, casing, etc. of a steam turbine is attached to a test apparatus and installed in a turbine casing, and the material test piece is taken out from a destructive test performed when the operation is stopped. In a material consumption monitoring material tester equipped with material test pieces that estimate the life and remaining life of materials such as casings, a material test that has a step surface perpendicular to the axis, facing the grips at both ends inward. And a pull rod having the same length on both sides of the material test piece parallel to the material test piece and having a coefficient of thermal expansion larger than that of the material test piece, and the grip portion of the material test piece penetrates through the two sides of the material test piece. It consists of a material test piece that is in contact with the step surface of the grip part and is attached to each end surface of each of the pull rods on both sides, and a life consumption monitoring material testing device that consists of a horizontal plate of the same material. Lifetime consumption monitoring material testing apparatus fitted with a material specimen, characterized in that it allowed comprising a mounting means for mounting to the bottle casing. 2. A material test piece of the same material as that of a rotor or casing of a steam turbine is attached to a test device and installed in a turbine casing, and the material test piece is taken out from a destructive test when the operation is stopped. In a life-consumption monitoring material testing device equipped with material test pieces for estimating the life and remaining life of materials such as casings, a material test piece having a step surface perpendicular to the axis and facing outwards at the grips at both ends.
A compression rod having the same coefficient of thermal expansion as that of the material test piece and having the same length on both sides of the material test piece parallel to the material test piece, It consists of a material consumption tester consisting of a material test piece and a horizontal plate of the same material that are in contact with the step surface and are attached to both end surfaces of the compression rods on both sides.
A material testing device for life consumption monitoring with a material test piece, characterized by comprising mounting means for mounting this on a turbine casing. 3. The projection according to claim 1, wherein the material plate has the same material and the same height as the horizontal plate at both ends of at least one horizontal plate through which the grips on both sides of the material test piece penetrate. And a material consumption test piece with a material test piece attached to each of the protrusions on both sides. 4. A protrusion according to claim 2, wherein the material test piece is provided at both ends of at least one of the horizontal plates through which the grip portions on both sides of the material test piece penetrate, respectively, with the same material as the horizontal plate and having the same height. , And a compression rod is attached to each of the protrusions on both sides, and a material consumption tester is attached to the material test piece. 5. The life-consumption monitoring material testing device according to claim 1, wherein the lateral plate is made of the same material as that of the pull rod. 6. The material consumption monitoring device for life monitoring according to claim 2, wherein the lateral plate is made of the same material as the compression rod. 7. A material testing device for life consumption monitoring with a material test piece attached thereto according to claim 3, wherein the horizontal plate and the projection are made of the same material as the pull rod. 8. The life-consumption monitoring material testing device with a material test piece attached thereto according to claim 4, wherein the lateral plate and the projection are made of the same material as the compression rod. 9. The material consumption test according to any one of claims 1 to 8, wherein the material test piece has parallel portions with a uniform cross section. apparatus. 10. The material according to claim 1, wherein the material test piece is provided with an annular cutout at one location of a parallel portion having a uniform cross section. Material consumption monitoring device for life consumption monitoring with test piece attached.