CN110985140A - Method for judging anti-seismic performance of steam turbine thrust bearing system - Google Patents

Method for judging anti-seismic performance of steam turbine thrust bearing system Download PDF

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CN110985140A
CN110985140A CN201911327820.0A CN201911327820A CN110985140A CN 110985140 A CN110985140 A CN 110985140A CN 201911327820 A CN201911327820 A CN 201911327820A CN 110985140 A CN110985140 A CN 110985140A
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thrust bearing
thrust
bearing seat
stress
disc
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CN110985140B (en
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黄智敏
刘春�
徐洪峰
魏红阳
张玥
刘蕾
王颖
白学伟
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Harbin Turbine Co Ltd
Hadian Power Equipment National Engineering Research Center Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/16—Arrangement of bearings; Supporting or mounting bearings in casings

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  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Turbines (AREA)

Abstract

A method for judging the anti-seismic performance of a turbine thrust bearing system relates to a technology for judging the anti-seismic performance of the turbine thrust bearing system, and aims to solve the problem that the anti-seismic performance of the turbine thrust bearing system cannot be judged by the existing judging method. The invention calculates the resultant stress of the disk surface pressure and the dangerous section through the thrust disk, calculates the resultant stress of the dangerous section under two conditions through the thrust bearing seat, and obtains the conclusion whether the component strength is qualified under the action of the earthquake load through comparing the stress with the allowable material value. The method has the advantages of providing a set of feasible judgment method, perfecting the earthquake evaluation analysis of the steam turbine set, reducing the loss of the steam turbine in the earthquake, improving the safety level of the set and reducing the operation cost.

Description

Method for judging anti-seismic performance of steam turbine thrust bearing system
Technical Field
The invention relates to a technology for judging the anti-seismic performance of a turbine thrust bearing system.
Background
The earthquake load generates two random actions of horizontal direction and vertical direction on the foundation in the form of wave, and the two waves do not influence each other. Currently, two seismic magnitudes are adopted in seismic force calculation: one seismic magnitude is a safety shutdown criterion; another seismic magnitude is a restart criterion; the standard of the safety shutdown criterion and the standard of the restarting criterion are respectively as follows:
safety shutdown criteria: when earthquake load acts on the unit, the unit can ensure the integrity of the structure after safe shutdown, and all components are not obviously damaged; the maximum resultant stress during earthquake is less than a certain value of the yield strength of the material; the magnitude of this seismic load is shown in table one:
Figure BDA0002328825730000011
meter-safety shutdown earthquake load meter
Wherein f is the natural frequency;
restart criteria: when the earthquake load is applied to the unit, all components of the unit can be restarted to operate according to normal operating regulations, the maximum resultant stress during the earthquake is less than a certain value of 1/2 yield strength of the material, and the magnitude of the earthquake load is shown in a second table:
Figure BDA0002328825730000012
meter double-start earthquake load meter
The steam turbine is used as an important component of a power station, and in the aspect of earthquake resistance, research and calculation of the earthquake magnitude on the earthquake resistance of a thrust bearing system of the steam turbine are blank; with the development of modern science and technology and frequent earthquakes, the earthquake-resistant performance of the steam turbine becomes very important.
Disclosure of Invention
The invention aims to solve the problem that the existing judging method cannot judge the anti-seismic performance of a turbine thrust bearing system, and provides a method for judging the anti-seismic performance of the turbine thrust bearing system.
The invention relates to a method for judging the anti-seismic performance of a turbine thrust bearing system, which comprises the following steps: a thrust disc anti-seismic performance judgment method and a thrust bearing seat anti-seismic performance judgment method;
the method for judging the anti-seismic performance of the thrust disc is realized by the following steps:
step one, calculating the disc surface pressure of a thrust disc;
step two, making a ratio of the disk surface pressure of the thrust disk obtained in the step one to the yield strength of the thrust disk material to obtain a ratio result M1,
step three, calculating the dangerous section resultant stress of the thrust disc;
step four, making a ratio of the dangerous section resultant stress of the thrust disc obtained in the step three to the yield strength of the thrust disc material to obtain a ratio result M2,
step five, comparing the ratio result M1 obtained in the step two with 1/2, and simultaneously comparing the ratio result M2 obtained in the step four with 1/2; if the ratio result M1 and the ratio result M2 are respectively smaller than 1/2, the strength of the thrust disc under the action of the seismic load is qualified; otherwise, the strength of the thrust disc is unqualified under the action of the earthquake load;
the method for judging the anti-seismic performance of the thrust bearing seat is realized by the following steps:
step 1, calculating the resultant stress of a dangerous section of a thrust bearing seat in the horizontal direction;
step 2, making a ratio of the resultant stress of the horizontal dangerous section of the thrust bearing seat obtained in the step one to the yield strength of the material of the thrust bearing seat 3 to obtain a ratio result N1,
step 3, calculating the resultant stress of the dangerous section of the thrust bearing seat in the vertical direction;
step 4, making a ratio of the resultant stress of the vertical dangerous section of the thrust bearing seat obtained in the step one to the yield strength of the thrust bearing seat material to obtain a ratio result N2;
step 5, comparing the ratio results N1 and 1/2 obtained in the step 2, and simultaneously comparing the ratio results N2 and 1/2 obtained in the step 4; if the ratio result N1 and the ratio result N2 are respectively smaller than 1/2, the strength of the thrust bearing seat under the action of the seismic load is qualified; otherwise, the strength of the thrust bearing seat is unqualified under the action of the earthquake load.
The method has the advantages that the method for judging the anti-seismic performance of the thrust bearing system is converted into a method for judging the anti-seismic performance of a thrust disc and a method for judging the anti-seismic performance of a thrust bearing seat; a set of feasible judgment method is provided, the earthquake evaluation analysis of the steam turbine set is perfected, the loss of the steam turbine in the earthquake is reduced, the safety level of the set is improved, and the operation cost is reduced.
Drawings
FIG. 1 is a cross-sectional view of a thrust disk in accordance with a second embodiment, wherein 1 is a rotor;
FIG. 2 is a radial bending moment coefficient plot for the fourth embodiment;
FIG. 3 is a plot of tangential bending moment coefficients for a fourth embodiment;
FIG. 4 is a schematic view of a fifth embodiment of a thrust bearing;
FIG. 5 is a cross-sectional view of a thrust bearing of the fifth embodiment, wherein A-A is a dangerous cross-section of the thrust bearing seat in a horizontal direction and C-C is a dangerous cross-section of the thrust bearing seat in a vertical direction.
Detailed Description
The first embodiment is as follows: the method for judging the anti-seismic performance of the steam turbine thrust bearing system in the embodiment is characterized by comprising the following steps of: a thrust disc 2 anti-seismic performance judgment method and a thrust bearing seat 3 anti-seismic performance judgment method;
the method for judging the anti-seismic performance of the thrust disc 2 is realized by the following steps:
step one, calculating the disc surface pressure of the thrust disc 2;
step two, the ratio of the plate surface pressure of the thrust plate 2 obtained in the step one to the yield strength of the material of the thrust plate 2 is obtained to obtain a ratio result M1,
step three, calculating the dangerous section resultant stress of the thrust disc 2;
step four, the ratio of the dangerous section resultant stress of the thrust disc 2 obtained in the step three to the yield strength of the material of the thrust disc 2 is made to obtain a ratio result M2,
step five, comparing the ratio result M1 obtained in the step two with 1/2, and simultaneously comparing the ratio result M2 obtained in the step four with 1/2; if the ratio result M1 and the ratio result M2 are respectively smaller than 1/2, the strength of the thrust disc 2 under the action of the seismic load is qualified; otherwise, the strength of the thrust disc 2 is unqualified under the action of the earthquake load;
the method for judging the anti-seismic performance of the thrust bearing pedestal 3 is realized by the following steps:
step 1, calculating the dangerous section resultant stress of a thrust bearing seat 3 in the horizontal direction;
step 2, making a ratio of the resultant stress of the horizontal dangerous section of the thrust bearing seat 3 obtained in the step one to the yield strength of the material of the thrust bearing seat 3 to obtain a ratio result N1,
step 3, calculating the resultant stress of the dangerous section of the thrust bearing seat 3 in the vertical direction;
step 4, making a ratio of the resultant stress of the vertical dangerous section of the thrust bearing seat 3 obtained in the step one to the yield strength of the material of the thrust bearing seat 3 to obtain a ratio result N2;
step 5, comparing the ratio results N1 and 1/2 obtained in the step 2, and simultaneously comparing the ratio results N2 and 1/2 obtained in the step 4; if the ratio result N1 and the ratio result N2 are respectively smaller than 1/2, the strength of the thrust bearing seat 3 under the action of the earthquake load is qualified; otherwise, the strength of the thrust bearing seat 3 is unqualified under the action of the earthquake load.
In this embodiment, it is not necessary to consider the "safe shutdown criteria" criteria in the structure associated with the thrust bearing system, which, although it may lead to serious internal damage, is ignored as occurring inside the cylinder; the thrust bearing system is calculated according to the "restart criteria", so that the ratio M1 and the ratio M2 are compared with 1/2 in step five, and the ratio N1 and the ratio N2 are compared with 1/2 in step 5.
Considering whether the classification of each component is to determine whether the component is "rigid" or "flexible", which is a relative term, the flexible rigidity of a component is now derived by calculating the natural frequency of the component, and is rigid when the calculated frequency is greater than 15Hz, and flexible otherwise; generally, the rotor, the cylinder and the supporting parts of both are in the rigid range, and the pipes, ducts and the like are in the flexible range; for a steam turbine unit, the frequency of a system is a relevant factor, and the relatively rigid parts are connected with each other, so that the frequency of the system is within a flexible range; the position of the thrust bearing is used as a relative dead point of a rotor and a stator of the unit, the thrust bearing bears the impact of the whole shafting during an earthquake, and the thrust disc 2 and the thrust bearing seat 3 are arranged in the steam turbine, so that the calculation is carried out according to the 'restarting criterion' of the flexible part.
The yield strength of the material of the thrust disc 2 and the yield strength of the material of the thrust bearing seat 3 are respectively constant values, and the yield strength of the material of the thrust disc 2 and the yield strength of the material of the thrust bearing seat 3 are respectively related to the materials.
The second embodiment is as follows: the present embodiment is described with reference to fig. 1, and the present embodiment is further limited to the method for determining the anti-seismic performance of the steam turbine thrust bearing system according to the first embodiment, in the present embodiment, the specific method for calculating the disk surface pressure of the thrust disk 2 in the first step is as follows:
P＝F1/(π*a2-π*b2)
wherein b is the inner radius of the thrust disc 2, a is the outer radius of the thrust disc 2, F1The pressure born by the thrust disc 2 under the earthquake load.
In the present embodiment, the inner radius of the thrust disc 2 is equal to the outer radius of the rotor 1.
The third concrete implementation mode: in this embodiment, the method for determining the anti-seismic performance of the steam turbine thrust bearing system according to the second embodiment is further defined, and in this embodiment, the thrust disk 2 bears a seismic loadPressure F of1Equal to 1.25 times the total weight of the rotor 1.
The fourth concrete implementation mode: the present embodiment is described with reference to fig. 2 to 3, and the present embodiment is further limited to the method for determining the anti-seismic performance of the steam turbine thrust bearing system according to the third embodiment, and in the present embodiment, the specific method for calculating the dangerous section resultant stress of the thrust disc 2 in the third step is as follows:
Figure BDA0002328825730000041
wherein σcFor the dangerous cross-sectional resultant stress, σ, of the thrust disc 2rFor radial stress of thrust disc 2, σtThe outer diameter shear stress of the thrust disc 2 is shown, and tau is the inner diameter shear stress of the thrust disc 2;
resultant stress sigma of dangerous cross section of thrust disk 2r＝6×Mr/(2×T2) Wherein M isrThe radial bending moment of the thrust disc 2 is shown, and T is the thickness of the thrust disc 2; radial bending moment of thrust disc 2
Figure BDA0002328825730000042
Wherein the content of the first and second substances,
Figure BDA0002328825730000043
is the radial bending moment coefficient;
thrust disc 2 outer diameter shear stress sigmat＝6×Mt/(2×T2) Wherein M istIs the tangential bending moment of the thrust disc 2; tangential bending moment M of thrust disk 2t＝P×a2X β, wherein β is the tangential bending moment coefficient;
inner diameter shear stress tau of thrust disc 2 is F1/(π×b×T)。
In the present embodiment, the radial bending moment coefficient
Figure BDA0002328825730000051
From fig. 2, specific values can be found, in fig. 2,
Figure BDA0002328825730000052
the tangential bending moment coefficient β is represented by the figure 3Specific values can be found, which, in figure 3,
Figure BDA0002328825730000053
the fifth concrete implementation mode: the present embodiment is described with reference to fig. 4 to 5, and the present embodiment is further limited to the method for determining the anti-seismic performance of the steam turbine thrust bearing system according to the first embodiment, and in the present embodiment, the specific method for calculating the dangerous cross-section resultant stress of the thrust bearing block 3 in the horizontal direction in step 1 is as follows:
Figure BDA0002328825730000054
wherein σAcFor the dangerous cross-sectional resultant stress, τ, of the thrust bearing block 3 in the horizontal directionAFor the shear stress, σ, of the thrust bearing block 3 in the horizontal directionABending stress of the dangerous section of the thrust bearing seat 3 in the horizontal direction;
bending stress σ of thrust bearing block 3 in horizontal critical sectionA＝3*F2*(R2-R0)/(2π*R2*h2)；
Wherein, F2The pressure, R, to which the thrust bearing housing 3 is subjected under seismic loading2Is the inner radius, R, of the thrust bearing housing 30The distance from the center line of the rotor 1 to the plane of a boss of the thrust bearing seat 3 is shown, and h is the thickness of the boss of the thrust bearing seat 3;
dangerous cross-sectional shear stress tau of thrust bearing seat 3 in horizontal directionA＝F2/(2π*R2*h)。
The sixth specific implementation mode: in this embodiment, the method for determining the anti-seismic performance of the steam turbine thrust bearing system according to the fifth embodiment is further limited, and in this embodiment, the pressure F borne by the thrust bearing seat 3 under the seismic load is2Equal to 1.25 times the total weight of the rotor 1.
In the present embodiment, the pressure F applied to the thrust bearing housing 3 under a shock load is2The pressure F borne by the thrust disc 2 under the third seismic load of the embodiment1Are equal.
The seventh embodiment: in this embodiment, the method for determining the anti-seismic performance of the steam turbine thrust bearing system according to the sixth embodiment is further defined, and in this embodiment, the specific method for calculating the total stress of the vertical dangerous section of the thrust bearing block 3 in step 3 is as follows:
σCC＝σC+σC2
wherein σCCThe total stress of the dangerous section of the thrust bearing seat 3 in the vertical direction; sigmaCThe tensile stress of the dangerous section of the thrust bearing seat 3 in the vertical direction; sigmaC2Bending stress of the dangerous section of the thrust bearing seat 3 in the vertical direction;
tensile stress of thrust bearing block 3 in vertical direction in dangerous section
Figure BDA0002328825730000061
Wherein R is1The outer radius of the thrust bearing block 3;
bending stress σ of the thrust bearing block 3 in the vertical direction in the danger cross sectionC2＝3F2*(R2-R0)/(2π*R2*(R1-R2)2)。

Claims (7)

1. A method for judging the anti-seismic performance of a turbine thrust bearing system is characterized by comprising the following steps: a thrust disc (2) anti-seismic performance judging method and a thrust bearing seat (3) anti-seismic performance judging method;
the method for judging the anti-seismic performance of the thrust disc (2) is realized by the following steps:
step one, calculating the disc surface pressure of the thrust disc (2);
step two, making a ratio of the plate surface pressure of the thrust plate (2) obtained in the step one to the yield strength of the material of the thrust plate (2) to obtain a ratio result M1,
thirdly, calculating the dangerous section resultant stress of the thrust disc (2);
step four, making a ratio of the resultant stress of the dangerous section of the thrust disc (2) obtained in the step three to the yield strength of the material of the thrust disc (2) to obtain a ratio result M2,
step five, comparing the ratio result M1 obtained in the step two with 1/2, and simultaneously comparing the ratio result M2 obtained in the step four with 1/2; if the ratio result M1 and the ratio result M2 are respectively smaller than 1/2, the strength of the thrust disc (2) under the action of the seismic load is qualified; otherwise, the strength of the thrust disc (2) is unqualified under the action of the earthquake load;
the method for judging the anti-seismic performance of the thrust bearing seat (3) is realized by the following steps:
step 1, calculating the resultant stress of a dangerous section of a thrust bearing seat (3) in the horizontal direction;
step 2, making a ratio of the resultant stress of the horizontal dangerous section of the thrust bearing seat (3) obtained in the step one to the yield strength of the material of the thrust bearing seat (3) to obtain a ratio result N1,
step 3, calculating the resultant stress of the dangerous section of the thrust bearing seat (3) in the vertical direction;
step 4, making a ratio of the resultant stress of the vertical dangerous section of the thrust bearing seat (3) obtained in the step one to the yield strength of the material of the thrust bearing seat (3) to obtain a ratio result N2;
step 5, comparing the ratio results N1 and 1/2 obtained in the step 2, and simultaneously comparing the ratio results N2 and 1/2 obtained in the step 4; if the ratio result N1 and the ratio result N2 are respectively smaller than 1/2, the strength of the thrust bearing seat (3) under the action of the seismic load is qualified; otherwise, the strength of the thrust bearing seat (3) is unqualified under the action of the earthquake load.
2. The method for judging the anti-seismic performance of the steam turbine thrust bearing system according to claim 1, wherein the concrete method for calculating the disc surface pressure of the thrust disc (2) in the first step is as follows:
P＝F1/(π*a2-π*b2)
wherein b is the inner radius of the thrust disc (2), a is the outer radius of the thrust disc (2), F1The pressure born by the thrust disc (2) under the earthquake load.
3. The method for determining the anti-seismic performance of the steam turbine thrust bearing system according to claim 2, wherein the pressure F borne by the thrust disc (2) under the seismic load is1Equal to 1.25 times the total weight of the rotor.
4. The method for judging the anti-seismic performance of the steam turbine thrust bearing system according to claim 3, wherein the specific method for calculating the dangerous section resultant stress of the thrust disc (2) in the third step is as follows:
Figure FDA0002328825720000021
wherein σcIs the dangerous cross-sectional resultant stress, sigma, of the thrust disc (2)rIs the radial stress of the thrust disc (2) (. sigma.)tThe outer diameter shear stress of the thrust disc (2) is shown, and the tau is the inner diameter shear stress of the thrust disc (2);
the resultant stress sigma of the cross-section of the thrust disk (2) at riskr＝6×Mr/(2×T2) Wherein M isrIs the radial bending moment of the thrust disc (2), and T is the thickness of the thrust disc (2); radial bending moment of thrust disc (2)
Figure FDA0002328825720000023
Wherein the content of the first and second substances,
Figure FDA0002328825720000024
is the radial bending moment coefficient;
outer diameter shear stress sigma of thrust disc (2)t＝6×Mt/(2×T2) Wherein M istIs the tangential bending moment of the thrust disc (2); tangential bending moment M of thrust disc (2)t＝P×a2X β, wherein β is the tangential bending moment coefficient;
the inner diameter shear stress tau of the thrust disc (2) is F1/(π×b×T)。
5. The method for judging the anti-seismic performance of the steam turbine thrust bearing system according to claim 1, wherein the specific method for calculating the combined stress of the dangerous section of the thrust bearing seat (3) in the horizontal direction in the step 1 comprises the following steps:
Figure FDA0002328825720000022
wherein σAcIs the dangerous section resultant stress of the thrust bearing seat (3) in the horizontal direction, tauAFor the shear stress, sigma, of the horizontal dangerous section of the thrust bearing block (3)ABending stress of a dangerous section of the thrust bearing seat (3) in the horizontal direction;
bending stress sigma of dangerous section of thrust bearing seat (3) in horizontal directionA＝3*F2*(R2-R0)/(2π*R2*h2)；
Wherein, F2Is the pressure born by the thrust bearing seat (3) under the earthquake load, R2Is the inner radius, R, of the thrust bearing seat (3)0The distance from the center line of the rotor to the plane of a boss of the thrust bearing seat (3) is shown, and h is the thickness of the boss of the thrust bearing seat (3);
shear stress tau of dangerous section of thrust bearing seat (3) in horizontal directionA＝F2/(2π*R2*h)。
6. The method for determining the anti-seismic performance of the steam turbine thrust bearing system according to claim 5, wherein the pressure F borne by the thrust bearing seat (3) under the seismic load is2Equal to 1.25 times the total weight of the rotor.
7. The method for judging the anti-seismic performance of the steam turbine thrust bearing system according to claim 6, wherein the specific method for calculating the combined stress of the dangerous section of the thrust bearing seat (3) in the vertical direction in the step 3 comprises the following steps:
σCC＝σC+σC2
wherein σCCThe stress is the combined stress of the dangerous section of the thrust bearing seat (3) in the vertical direction; sigmaCThe tensile stress of the thrust bearing seat (3) on a vertical dangerous section is adopted; sigmaC2Bending stress of a dangerous section of the thrust bearing seat (3) in the vertical direction;
tensile stress of thrust bearing seat (3) in vertical dangerous section
Figure FDA0002328825720000031
Wherein R is1The outer radius of the thrust bearing seat (3);
bending stress sigma of dangerous section of thrust bearing seat (3) in vertical directionC2＝3F2*(R2-R0)/(2π*R2*(R1-R2)2)。
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Cited By (1)

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CN112710568A (en) * 2020-12-17 2021-04-27 哈尔滨汽轮机厂有限责任公司 Method for detecting strength of centering beam of steam turbine

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JP2014118909A (en) * 2012-12-18 2014-06-30 Toshiba Corp Turbine
CN203756735U (en) * 2014-04-10 2014-08-06 哈尔滨汽轮机厂有限责任公司 Thrust support bearing of steam turbine rotor
CN107916960A (en) * 2017-12-12 2018-04-17 中广核工程有限公司 Nuclear power turbine-generator unit dual-gripper spring discharges and locking logical method and system

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Publication number Priority date Publication date Assignee Title
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JP2014118909A (en) * 2012-12-18 2014-06-30 Toshiba Corp Turbine
CN203756735U (en) * 2014-04-10 2014-08-06 哈尔滨汽轮机厂有限责任公司 Thrust support bearing of steam turbine rotor
CN107916960A (en) * 2017-12-12 2018-04-17 中广核工程有限公司 Nuclear power turbine-generator unit dual-gripper spring discharges and locking logical method and system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112710568A (en) * 2020-12-17 2021-04-27 哈尔滨汽轮机厂有限责任公司 Method for detecting strength of centering beam of steam turbine
CN112710568B (en) * 2020-12-17 2024-05-28 哈尔滨汽轮机厂有限责任公司 Method for detecting strength of centering beam of steam turbine

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