CN113158352A - Method for evaluating remaining service life of water turbine generator set based on key components - Google Patents
Method for evaluating remaining service life of water turbine generator set based on key components Download PDFInfo
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Abstract
The technical scheme adopted by the invention is as follows: a method for evaluating the residual service life of a hydroelectric generating set based on key components is characterized by comprising the following steps: A. finding out key components influencing the service life of the super-service water-turbine generator set according to the state of the water-turbine generator set; B. performing rigidity strength analysis and fatigue strength calculation on each key component; C. calculating to obtain a service life calculation value D of each key component according to the analysis result of the rigidity strength and the fatigue strength of each key component, and performing weighted summation calculation to obtain a service life calculation value of the service-exceeding hydroelectric generating set according to the service life calculation value of each key component and a weight coefficient of each key component on the service life of the hydroelectric generating set; E. and subtracting the operating years from the operating life calculation value of the overdimensioned hydroelectric generating set obtained by calculation, and calculating to obtain the remaining operating life calculation value of the overdimensioned hydroelectric generating set.
Description
Technical Field
The invention belongs to the technical field of water conservancy and hydropower engineering, and particularly relates to a method for evaluating the residual service life of a water-turbine generator set based on key components.
Background
At present, the installed capacity of water and electricity in China exceeds 3.5 hundred million kilowatts, and the water-turbine generator set and electrical and mechanical auxiliary equipment of the old power station built and put into operation in the 70 and 80 th ages in the 20 th century are close to or reach the service life. The hydroelectric generating set is the core equipment for energy conversion of the hydropower station, and the reliability of the hydroelectric generating set is not only related to the stable operation of the hydropower station and an electric power system, but also related to the normal exertion of the benefits and social benefits of the hydropower station, so that the hydroelectric generating set is one of important objects for life-prolonging safety evaluation and technical transformation of the hydropower station.
According to the relevant requirements of the national energy agency and the national power grid, in a period of time in the future, the life prolonging safety evaluation must be carried out on the prolonged service of the water-turbine generator set which is close to or reaches the service life, so that the influence on the normal operation of a hydropower station is avoided, and the purpose of prolonging the safe operation life of the water-turbine generator set is achieved by the life prolonging evaluation, updating, transformation and the like of the water-turbine generator set.
Therefore, the timely safety assessment and the estimation, updating and reconstruction of the residual service life of the overdue service water turbine generator set are necessary measures for deeply implementing the safety production law of the people's republic of China and related laws, regulations and regulations, are important measures for strengthening the life prolonging management of the generator set by the functional department of the supervisor, and are management basis for establishing a long-acting mechanism of the safety production of the life prolonging generator set by the power enterprise. Meanwhile, safety evaluation and residual service life estimation of the out-of-service water-turbine generator set are important research works which must be carried out in response to national requirements, the safety and the reliability of equipment can be improved, the utilization degree of the equipment is fully exerted, and therefore the maximum economic benefit and the maximum social benefit are achieved.
Disclosure of Invention
The invention aims to solve the defects of the background technology, and provides a method for evaluating the residual service life of a hydroelectric generating set based on key components, which is used for evaluating the state safety of the hydroelectric generating set reaching the design service life, researching and judging the running reliability of the hydroelectric generating set and prolonging the service life of the hydroelectric generating set equipment.
The technical scheme adopted by the invention is as follows: a method for evaluating the residual service life of a hydroelectric generating set based on key components is characterized by comprising the following steps:
A. finding out key components influencing the service life of the super-service water-turbine generator set according to the state of the water-turbine generator set;
B. performing rigidity strength analysis and fatigue strength calculation on each key component;
C. calculating the service life calculated value of each key part according to the rigidity strength analysis and fatigue strength calculation results of each key part
D. According to the service life calculated value of each key component and the weight coefficient of each key component influencing the service life of the water-turbine generator set, carrying out weighted summation calculation to obtain the service life calculated value of the service life of the water-turbine generator set in the exceeding period;
E. and subtracting the operating years from the operating life calculation value of the overdimensioned hydroelectric generating set obtained by calculation, and calculating to obtain the remaining operating life calculation value of the overdimensioned hydroelectric generating set.
In the technical scheme, in the step A, the key components influencing the service life of the water turbine generator set in the overtime service are found out by evaluating the running condition of the water turbine in the overtime service, evaluating the starting and stopping state of the water turbine, evaluating the running stability of the water turbine, evaluating the parameter state of the water turbine and carrying out finite element calculation evaluation analysis on the rigidity strength and fatigue failure of the rotating wheel, the top cover, the seat ring, the main shaft, the inlet door and the tail water pipe disc valve.
In the technical scheme, in the step A, the key components influencing the service life of the generator of the super-service water-turbine generator set are found out by evaluating the starting and stopping state and the parameter state of the super-service generator, observing, detecting the flaw and sampling the main shaft, the stator, the rotor, the thrust bearing, the guide bearing, the upper frame and the lower frame on site, calculating, evaluating and analyzing the finite element of the rigidity strength and the fatigue damage of the key components of the generator and measuring and contrastively analyzing the permanent deformation of the key components.
In the technical scheme, the sum of the weight coefficients of all the key components of the water turbine part of the water turbine generator set on the service life of the water turbine generator set is 0.55, and the sum of the weight coefficients of all the key components of the generator part of the water turbine generator set on the service life of the water turbine generator set is 0.45.
In the above technical solution, the weight coefficients of the key components of the francis turbine are distributed as follows: 0.06 of top cover, 0.04 of seat ring, 0.03 of control ring, 0.05 of guide vane, 0.03 of servomotor, 0.12 of rotating wheel, 0.05 of volute, 0.05 of main shaft of water turbine, 0.03 of water guide bearing, 0.01 of tail water pipe disk valve, 0.02 of volute entrance door, 0.02 of conical pipe entrance door, 0.01 of top cover connecting bolt, 0.01 of main shaft connecting bolt, 0.01 of drain cone fastening bolt and 0.01 of main shaft seal.
In the above technical solution, the weight coefficients of the key components of the axial flow turbine are distributed as follows: 0.06 part of top cover, 0.04 part of support cover, 0.03 part of control ring, 0.05 part of guide vane, 0.03 part of servomotor, 0.12 part of runner, 0.03 part of oil receiver, 0.05 part of main shaft of water turbine, 0.03 part of water guide bearing, 0.01 part of tail water pipe disk valve, 0.02 part of volute entrance door, 0.02 part of runner chamber entrance door, 0.02 part of cone entrance door, 0.01 part of top cover connecting bolt, 0.01 part of blade connecting bolt, 0.01 part of main shaft connecting bolt and 0.01 part of drain cone fastening bolt.
In the technical scheme, the weight coefficients of key components of the through-flow turbine are distributed as follows: 0.1 tubular seat, 0.04 inner water distribution ring, 0.04 outer water distribution ring, 0.02 runner chamber, 0.05 guide vane, 0.03 servomotor, 0.12 runner, 0.03 oil receiver, 0.01 water guide cone, 0.05 water turbine main shaft, 0.03 water guide bearing, 0.01 blade connecting bolt, 0.01 main shaft connecting bolt, 0.01 heavy hammer and 0.01 main shaft seal.
In the above technical solution, the weight coefficients of the key components of the impulse turbine are distributed as follows: 0.05 part of water distribution ring pipe, 0.05 part of direct current spray pipe, 0.03 part of spray needle, 0.03 part of deflector, 0.02 part of mouth ring, 0.03 part of spray needle servomotor, 0.03 part of deflector servomotor, 0.12 part of rotating wheel, 0.05 part of main shaft of water turbine, 0.03 part of water guide bearing, 0.03 part of machine shell, 0.04 part of water stabilizing grid, 0.01 part of rotating wheel connecting bolt, 0.01 part of main shaft connecting bolt, and 0.02 part of rotating wheel chamber entrance door.
In the above technical solution, the weight coefficients of the key components of the generator are distributed as follows: 0.08 of a stator frame, 0.03 of an upper frame, 0.03 of a lower frame (thrust support), 0.03 of a magnetic pole, 0.03 of a magnetic yoke, 0.02 of a rotor support, 0.05 of a main shaft of a generator, 0.03 of an upper/lower guide bearing, 0.03 of a thrust bearing, 0.02 of an upper end shaft of the generator, 0.02 of an elastic oil tank, 0.02 of a brake air brake, 0.02 of an air cooler, 0.01 of an upper end shaft fastening bolt, 0.01 of a rotor support fastening bolt, 0.01 of a stator frame fastening bolt and 0.01 of an upper frame fastening bolt.
The invention has the beneficial effects that: the method can effectively and scientifically evaluate the running safety and the residual service life of the water turbine generator set which is in service for a long time, perform state safety evaluation on the hydroelectric generator set which reaches the designed service life, judge the running reliability of the water turbine generator set, prolong the service life of the water turbine generator set equipment, improve the economic benefit of the water turbine generator set, and can be widely applied to the technical field of water conservancy and hydropower engineering.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.
The invention develops deep research on the evaluation criterion and method for evaluating the safety and estimating the residual service life of the overdue service hydroelectric generating set which has been operated for years, and establishes a set of evaluation method and criterion for estimating the residual service life of the overdue service hydroelectric generating set based on the rigidity strength analysis and the fatigue strength calculation of key components and the weight coefficient of the influence of the fatigue strength on the service life of the set. By adopting the evaluation method, the state safety of the hydroelectric generating set reaching the design life span is evaluated, the running reliability of the hydroelectric generating set is researched and judged, and the service life of the hydroelectric generating set is prolonged.
According to the structural characteristics of the water turbine generator set, the safety assessment and the residual service life estimation of the over-service water turbine generator set mainly comprise the assessment and detection of important key components and equipment which are not easy to replace in a power station, wherein a water turbine part (taking an axial flow water turbine as an example) comprises a top cover, a support cover, a control ring, a guide vane, a servomotor, a runner body, runner blades, a main shaft of the water turbine, a water guide bearing, a tail water pipe disc valve, a volute inlet door, a runner chamber inlet door, a taper pipe inlet door, auxiliary main shaft sealing, a speed regulating system and other key system components; the generator part comprises a stator, a rotor, an upper frame, a lower frame (or a thrust bracket), a thrust bearing, a guide bearing, a generator main shaft, an auxiliary excitation system and other key system components.
The fatigue damage and the fatigue life of key components of the water turbine generator set are determined by factors such as alternating stress, average stress (stable stress), the cycle characteristics of materials, the operation history and the operation conditions of the components and the like. By researching the start-stop rule, the operation condition and the structure and material characteristics of each key part of the hydroelectric generating set of the hydropower station, the key parts influencing the remaining service life of the hydroelectric generating set in service for a long time and evaluation indexes thereof are provided; the method comprises the steps of reasonably considering key components and boundary conditions of the water turbine generator set by adopting a finite element method, carrying out three-dimensional modeling on the key components of the water turbine generator set, analyzing stress and deformation conditions, rigidity and strength conditions of the key components of the water turbine and the generator by numerical simulation calculation, judging whether working stress and safety coefficient of each key component of the water turbine generator set are in a specification allowable range or not, and providing a fatigue life calculation value of each key component; and further provides a weight coefficient of the influence of each key component on the service life of the unit. And calculating the health state value of the water-turbine generator set in the current state and predicting the residual service life of the water-turbine generator set in the overdue service by combining the fatigue life calculation values and the weight coefficients of all the key components. On the basis, an equipment updating and reforming strategy based on the service life estimation of the water-turbine generator set is provided, so that the scientificity and the economy of the decision of the over-service management of the water-turbine generator set are improved.
(1) Key component and evaluation index of out-of-service hydroelectric generating set
1) Water turbine
The main dangerous and harmful factors of the water turbine during operation include: the normal operation of the unit is influenced by the creep, fatigue, oxidation and the like induced by factors such as cavitation damage, silt abrasion, hydraulic and mechanical vibration, overspeed of a water turbine under abnormal shutdown working conditions and the like, and the structure of the unit can be damaged in severe cases. Due to the difference of the operation working conditions and action mechanisms, the damage characteristics and damage generated by different parts of the water turbine after long-term operation are different, and the relevant factors which have important influence on the service life of the water turbine in the overtime service are found out by performing finite element calculation evaluation analysis on key parts such as the operating condition evaluation (vibration, swing, temperature, noise and the like) of the water turbine in the overtime service, the start-stop state evaluation of the water turbine, the operating stability evaluation of the water turbine, the parameter state evaluation (output, efficiency and operation area) of the water turbine, a rotating wheel, a top cover (comprising a connecting bolt), a seat ring, a main shaft (comprising the connecting bolt), an entry door, a tail water pipe disc valve and the like.
2) Generator
The operation of the generator is a long-time continuous energy conversion process, namely a process of converting mechanical energy into electric energy accompanied by the interaction of an electric field and a magnetic field. Therefore, insulation damage, short circuit, overheating and burning of bearings, local overheating of generator stators and rotors and the like, and accompanying mechanical and electromagnetic vibration phenomena are easy to occur; the phenomena that the pendulum values and the vibration values of all parts of the generator exceed standard requirements and the like threaten the safe operation of the generator in serious cases. Relevant factors which have important influence on the service life of the power generator in the overdue service period are found out by carrying out on-site observation, flaw detection, sampling analysis and the like on key parts of the power generator, namely the on-site observation, flaw detection, sampling analysis and the like on the key parts of the power generator, such as the on-site observation, flaw detection, sampling analysis and the like on the main shaft (comprising a connecting bolt), the stator, the rotor, the thrust bearing, the guide bearing, the upper frame and the lower frame (or a thrust support), and carrying out finite element calculation, evaluation and analysis on the rigidity strength and the fatigue damage of key parts of the power generator, measurement and comparative analysis on the permanent deformation of the key parts and the like.
(2) Key component rigidity and strength analysis and fatigue strength calculation
1) Water turbine section
The key parts of the water turbine (taking an axial flow water turbine as an example) comprise a top cover, a supporting cover, a control ring, a guide vane, a servomotor, a rotating wheel, a main shaft of the water turbine, a water guide bearing, a tail water pipe disc valve, a volute entrance door, a runner chamber entrance door, a taper pipe entrance door, a key part connecting bolt and the like.
Calculation of critical rotation speed of shafting
And calculating the critical rotating speed of the front 2 orders of the shaft system of the water turbine generator set by adopting a finite element method, and checking whether the critical rotating speed of the shaft system far exceeds the working rotating speed and the runaway rotating speed of the set. Meanwhile, a shafting critical rotating speed verification curve is drawn, and the accuracy of the critical rotating speed calculation is further verified; and (3) analyzing and researching the natural frequency of the torsional vibration of the front 2 orders of the shafting of the computer set to avoid the frequency conversion and the possible excitation frequency. And judging whether the unit shafting can safely and stably operate or not according to the two judgment conditions and whether the unit shafting has good dynamic characteristics or not.
② theory for analyzing rigidity and strength and calculating fatigue strength of critical parts of water turbine
Respectively calculating the calculated stress of each key component under different working conditions, analyzing and researching whether the allowable stress meeting the standard regulation is lower than the yield limit of the material or not, and whether the maximum equivalent stress appears in a local area and belongs to stress concentration or not, and accordingly judging whether the structural rigidity strength of each key component meets the design requirement or not.
Fatigue life analysis is carried out by adopting an accumulated damage criterion, a service life calculated value of the stress concentration position of each key part is calculated, and an accumulated damage coefficient calculation formula is as follows:
in the formula:
ni-number of design cycles within a range of stress variation amplitudes (or events);
Ni-an available number of cycles within the range of stress variation amplitude (or event) obtained by calculating the S-N curves of the stress and the material;
d-cumulative damage coefficient.
If the cumulative damage coefficient D is less than 1 over the number of load cycles calculated, then the fatigue strength is indicated to meet the design requirements over those calculated load cycles.
Thirdly, analyzing rigidity and strength of the top cover and calculating fatigue strength
A. Analysis of stiffness
And (3) carrying out three-dimensional model modeling on the top cover by adopting a finite element method, and respectively calculating the comprehensive displacement distribution, the equivalent stress distribution (local) and the like of the top cover under the two working conditions of a normal operation working condition and an emergency shutdown boosting working condition.
The limit of the stress is calculated by the finite element method given by the relevant standard and classified as follows:
Pm-primary film stress;
Pl-a local stress;
Pb-a primary bending stress;
Q-Primary film stress + discontinuous bending stress.
The reference allowable stress is designed as follows:
in the formula:
σb-the strength limit of the material;
σs-yield limit of the material.
Calculating allowable stress values of different stress types:
and comparing whether the calculated value obtained according to the numerical simulation is smaller than the allowable stress value and whether the calculated value of the maximum comprehensive displacement and the local displacement is smaller than the standard allowable value so as to judge whether the structural rigidity strength meets the design requirement.
B. Calculation of fatigue Strength
Considering the design life according to n years (n generally takes a value of 30 or 40), calculating the design life according to the average a times of emergency shutdown conditions per year, simultaneously considering the water pressure pulsation, calculating according to the average b times of water pressure pulsation per minute, and then designing the cycle number n of the top cover1As shown in the following table:
according to the above rigidity calculation conditions, the top cover alternating stress amplitude under two working conditions is obtained as shown in the following table:
in the formula:
Smax-maximum stress in alternating load cycle periods;
Smin-minimum stress in alternating load cycle cycles.
The available cycle times N of the alternating stress amplitude in the two working conditions of emergency shutdown and normal operation can be found on the corresponding numerical simulation S-N curve1C and d respectively.
From the above calculation, the fatigue cumulative damage coefficient D can be obtained as:
and judging whether D is less than 1, if so, indicating that the fatigue strength can meet the design requirement, considering the design life according to n years, calculating according to the average a times emergency shutdown working condition every year in the design life, simultaneously considering the water pressure pulsation, and calculating according to the average b times water pressure pulsation every minute, wherein the obtained service life calculation value of the stress concentration part of the top cover is n/D years.
The rigidity and strength analysis and fatigue strength calculation of other key parts of the water turbine are similar to the rigidity and strength analysis and fatigue strength calculation of the top cover. The calculation conditions of the support cover rigidity strength analysis and the fatigue strength calculation are completely the same as those of the top cover.
Control ring rigidity strength analysis and fatigue strength calculation
Processing a contact boundary condition according to the actual connection condition between the control ring and the top cover, calculating the stress of the control ring according to the fully-closed working condition, researching whether the maximum equivalent stress of the control ring is lower than an allowable stress value and whether the maximum comprehensive displacement exceeds a limit value, and further judging whether the structural rigidity strength meets the design requirement; in the fatigue strength calculation, the design life is considered according to n years, the average a-time total-off working condition times per year in the design life is calculated, the total fatigue accumulated damage coefficient is calculated, and the service life calculation value of the control loop is further calculated.
Analysis of guide vane rigidity and strength and fatigue strength calculation
Stress calculation is carried out on the guide vane under two working conditions of an runaway working condition and a rated working condition respectively, whether the maximum equivalent stress of the guide vane is lower than an allowable stress value or not and whether the maximum comprehensive displacement exceeds a limit value or not are researched, and whether the structural rigidity strength of the guide vane meets the design requirement or not is further judged; in the fatigue strength calculation, the design life is considered according to n years, the fatigue accumulated damage coefficients under the runaway working condition and the normal operation (considering the water pressure pulsation) are calculated according to the average runaway working condition a times per year, the water pressure pulsation is considered at the same time, the fatigue accumulated damage coefficients under the runaway working condition and the normal operation (considering the water pressure pulsation) are calculated according to the average water pressure pulsation b times per minute, the larger value of the fatigue accumulated damage coefficients is taken as the total fatigue accumulated damage coefficient of the guide vane, and the service life calculation value of the guide vane is calculated.
Analyzing the stiffness and the fatigue strength of the servomotor and calculating
Processing boundary conditions according to the actual connection condition of the front cover and the rear cover of the servomotor, calculating stress of the servomotor according to the maximum oil pressure working condition, and comparing whether the maximum equivalent stress of the servomotor is lower than an allowable stress value and whether the maximum comprehensive displacement exceeds a limit value; in the fatigue strength calculation, the design life is considered according to n years, the maximum oil pressure working condition times of a times per year in the design life are calculated, the total fatigue accumulated damage coefficient is calculated, and the service life calculation value of the servomotor is further calculated.
Analysis of rigidity and fatigue strength of runner body and runner blade
Stress calculation is carried out on a runner body and runner blades under three working conditions of an runaway working condition, a maximum water head working condition and a rated water head working condition respectively, whether the maximum equivalent stress of the runner body and the runner blades is lower than an allowable stress value and whether the maximum comprehensive displacement exceeds a limit value are researched, and whether the structural rigidity strength meets the design requirement is further judged; in the fatigue strength calculation, the design life is considered according to n years, the fatigue accumulated damage coefficients under the runaway working condition and the normal operation (considering the water pressure pulsation) are calculated according to the average runaway working condition a times per year and the water pressure pulsation in the design life, the larger value of the fatigue accumulated damage coefficients is taken as the total fatigue accumulated damage coefficient of the runner body and the runner blade, and the service life calculation value of the runner body and the runner blade is calculated.
Analysis of main shaft rigidity and strength and calculation of fatigue strength
The main shaft bears the action forces from 4 aspects of the weight of the runner, the axial hydraulic thrust, the maximum torque and the dead weight, and the axial load and the torque are exerted on the lower end surface of the shaft of the water turbine by simulating the application of axial constraint and tangential constraint on the upper end surface of the shaft of the water turbine. Stress calculation is carried out on the main shaft under the working conditions of 1.1 times and 1.4 times of equal-multiple rated power respectively, whether the main shaft is lower than an allowable stress value is analyzed and researched, and whether the structural rigidity strength meets the design requirement is further judged; in the fatigue strength calculation, the design life is considered according to n years, the average number of start-stop times per year is calculated within the design life, the total fatigue accumulated damage coefficient is calculated, and the service life calculation value of the main shaft of the water turbine is calculated.
Seventhly, analyzing the rigidity and the strength of the water guide bearing and calculating the fatigue strength
Stress calculation is carried out on the water guide bearing under two working conditions of an runaway working condition and a rated working condition respectively, whether the maximum equivalent stress of the water guide bearing is lower than an allowable stress value or not and whether the maximum comprehensive displacement exceeds a limit value or not are researched, and whether the structural rigidity strength of the water guide bearing meets the design requirement or not is further judged; in the fatigue strength calculation, the design life is considered according to n years, the fatigue accumulated damage coefficients under the runaway working condition and the normal operation (considering the water pressure pulsation) are calculated according to the average runaway working condition a times per year, the water pressure pulsation is considered at the same time, the fatigue accumulated damage coefficients under the runaway working condition and the normal operation (considering the water pressure pulsation) are calculated according to the average water pressure pulsation b times per minute, the larger value of the fatigue accumulated damage coefficients is taken as the total fatigue accumulated damage coefficient of the water guide bearing, and the service life calculation value of the water guide bearing is calculated.
Analysis of rigidity and fatigue strength of disc valve of tail water pipe
The calculation working conditions of the rigidity strength analysis and the fatigue strength calculation of the disk valve of the tail water pipe are completely the same as those of the servomotor.
Ninthly, analysis of the rigidity and strength of advance and calculation of the fatigue strength
The volute entrance door respectively calculates the calculated stress under the normal operation working condition and the boosting working condition, and researches whether the calculated stress is lower than an allowable stress value and whether the maximum comprehensive displacement exceeds a limit value so as to judge whether the structural rigidity strength meets the design requirement; in the fatigue strength calculation, the design life is considered according to n years, the average a times of boosting working condition per year in the design life is calculated, the water pressure pulsation is considered at the same time, the average b times of water pressure pulsation per minute is calculated, the fatigue accumulated damage coefficients under the boosting working condition and the normal operation (considering the water pressure pulsation) are respectively calculated, the larger value is taken as the total fatigue accumulated damage coefficient of the volute entrance door, and the service life calculation value of the volute entrance door is calculated.
The calculation conditions of the runner chamber entrance door and the cone tube entrance door strength analysis and the fatigue strength calculation are completely the same as those of the volute entrance door.
Stiffness strength analysis and fatigue strength calculation of connection bolt of key parts in R
And respectively calculating the bolt prestress, the bolt pretightening load and the residual clamping force of the connecting pair under the normal operation working condition and the emergency stop working condition by the top cover connecting bolt. All parts such as the bolt, the screw rod, the connecting rod and the like are subjected to prestress treatment, the prestress of the parts cannot exceed 7/8 of the yield strength of the material, the load of the bolt is not less than 2 times of the design load of the connecting part, and the residual clamping force of the connecting pair is not less than 0.5 time of the design load of the bolt, so that whether all parameter indexes of the bolt meet the national standard requirements or not and whether the parameter indexes of the bolt are reliable or not is judged; in the fatigue strength calculation, the calculation is carried out according to the design life of n years, the calculation is carried out according to the average normal operation working condition a times per year in the design life, meanwhile, the calculation is carried out according to the average emergency shutdown working condition b times per year, the fatigue accumulated damage coefficients under the normal operation working condition and the emergency shutdown working condition are respectively calculated, the larger value of the fatigue accumulated damage coefficients is taken as the total fatigue accumulated damage coefficient of the top cover connecting bolt, and the service life calculation value of the top cover connecting bolt is further calculated.
The calculation conditions and calculation steps of the rigidity strength analysis and fatigue strength calculation of the blade connecting bolt and the main shaft connecting bolt are completely the same as those of the top cover connecting bolt.
2) Generator part
The key parts of the generator comprise a stator base, an upper frame, a lower frame (or a thrust support), a magnetic pole, a magnetic yoke, a rotor support, a main shaft, a guide bearing, a thrust bearing, an upper end shaft of the generator, an elastic oil tank, a brake air brake, an air cooler and the like.
Firstly, analyzing the rigidity and the strength of the stator base and calculating the fatigue strength
And (3) calculating the front 3-order natural frequency of the stator base, and researching whether the electromagnetic excitation frequency of the unit is avoided or not, so as to judge whether the dynamic performance of the stator base is excellent or not and whether the poor vibration is generated due to the dynamic characteristics or not.
And respectively calculating the maximum equivalent stress under the rated working condition, the two-phase short-circuit working condition and the half magnetic pole short-circuit working condition, comparing whether the maximum equivalent stress is lower than an allowable stress value, and further judging whether the structural rigidity strength meets the design requirement.
In the fatigue strength calculation, the design life is considered according to n years, the fatigue accumulated damage coefficients under three working conditions of a rated working condition, a half magnetic pole short-circuit working condition and a two-phase short-circuit working condition are calculated according to a rated load operation working condition a times per year in the design life, and a half magnetic pole short-circuit working condition b times per year and a two-phase short-circuit working condition c times per year respectively, and the larger value is taken as the total fatigue accumulated damage coefficient of the stator base, so that the service life calculation value of the stator base is calculated.
Second, the rigidity and strength of the upper frame are analyzed and the fatigue strength is calculated
And (3) calculating the first 5-order natural frequency of the upper rack, and researching whether the natural frequency is higher than the frequency corresponding to the unit rotating frequency and the unit runaway rotating speed or not, so as to judge whether the power performance of the upper rack is excellent or not and whether the poor vibration is generated due to the power characteristics or not.
And respectively calculating the maximum equivalent stress under the rated working condition and the half magnetic pole short circuit working condition, observing whether the maximum equivalent stress is lower than an allowable stress value, and further judging whether the structural rigidity strength meets the design requirement.
In the fatigue strength calculation, the design life is considered according to n years, the fatigue accumulated damage coefficients under the rated working condition and the half magnetic pole short-circuit working condition are calculated according to the average a rated load operation working condition per year in the design life, meanwhile, the fatigue accumulated damage coefficients under the rated working condition and the half magnetic pole short-circuit working condition are calculated according to the average b half magnetic pole short-circuit working condition per year, the larger value of the fatigue accumulated damage coefficients is taken as the total fatigue accumulated damage coefficient of the upper frame, and the service life calculation value of the upper frame is calculated.
Thirdly, analyzing the rigidity and the strength of the lower frame (or the thrust support) and calculating the fatigue strength
The calculation working conditions of the lower frame (or thrust support) rigidity strength analysis and the fatigue strength calculation are completely the same as those of the hydraulic turbine top cover part.
Magnetic pole and magnetic yoke rigidity strength analysis and fatigue strength calculation
The maximum equivalent stress of the magnetic pole and the magnetic yoke under the normal operation working condition and the runaway working condition is respectively calculated, whether the allowable stress value is met or not and whether the allowable stress value is lower than the yield limit of the material or not are researched, whether the maximum equivalent stress appears in a local area or not belongs to stress concentration or not and whether the maximum radial displacement meets the requirement or not are judged, and whether the structural rigidity strength of the magnetic pole and the magnetic yoke meets the design requirement or not is judged.
In the fatigue strength calculation, the design life is considered according to n years, the fatigue accumulated damage coefficients under the rated working condition and the runaway working condition are calculated according to the average rated working condition a times per year in the design life, and the fatigue accumulated damage coefficients under the rated working condition and the runaway working condition are calculated according to the average runaway working condition b times per year respectively, the larger value of the fatigue accumulated damage coefficients is taken as the total fatigue accumulated damage coefficients of the magnetic pole and the magnetic yoke, and the service life calculation values of the magnetic pole and the magnetic yoke are calculated.
Fifthly, calculating the rigidity and the fatigue strength of the rotor bracket
And calculating the first 5-order natural frequency of the rotor support, analyzing and researching whether to avoid the electromagnetic excitation frequency of the unit or not, and judging whether the dynamic performance of the rotor support is excellent or not and whether the rotor support generates poor vibration or not due to the dynamic characteristics.
And respectively calculating the maximum stress under the rated working condition, the runaway working condition and the key striking working condition, researching whether the maximum stress is smaller than the yield limit of the material, meeting the requirements of the rigidity strength and the dynamic characteristic, and simultaneously checking whether the deflection of the rotor support meets the requirements, thereby judging whether the structural rigidity of the rotor support meets the design requirements.
In the fatigue strength calculation, according to the design life consideration of n years, the calculation is carried out according to the average a times rated operation working condition per year in the design life, meanwhile, the fatigue accumulated damage coefficients under the four working conditions of the rated operation working condition, the key-on working condition, the runaway working condition and the load shedding working condition are respectively calculated according to the average b times key-on working condition per year, the average c times runaway working condition per year and the average d times load shedding working condition per year, and the larger value is taken as the total fatigue accumulated damage coefficient of the rotor support, so that the service life calculation value of the rotor support is calculated.
Analysis of generator main shaft rigidity and strength and calculation of fatigue strength
The calculation conditions and calculation steps of the generator main shaft rigidity strength analysis and fatigue strength calculation are completely the same as those of the main shaft part of the water turbine.
Analysis of rigidity and strength and calculation of fatigue strength of upper/lower guide bearing and thrust bearing
The calculation conditions of the rigidity strength analysis and the fatigue strength calculation of the upper/lower guide bearing and the thrust bearing are completely the same as those of the water turbine guide bearing.
Analysis of rigidity and strength of upper end shaft of generator and calculation of fatigue strength
The maximum equivalent stress under the rated working condition and the half magnetic pole short circuit working condition is respectively calculated by the upper end shaft of the generator, whether the maximum equivalent stress is lower than an allowable stress value or not is researched, whether the shaft body stress of the upper end shaft of the generator is far lower than a yield limit or not is checked according to the strength requirement of the upper end shaft of the generator, whether the stress concentration part is far lower than the yield limit or not is checked, whether the maximum comprehensive displacement exceeds a limit value or not is judged, and whether the maximum comprehensive displacement meets the rigidity strength requirement or not is further judged.
In the fatigue strength calculation, the design life is considered according to n years, the fatigue accumulated damage coefficients under the rated working condition and the half magnetic pole short-circuit working condition are calculated according to the average rated working condition a times per year in the design life, meanwhile, the fatigue accumulated damage coefficients under the rated working condition and the half magnetic pole short-circuit working condition are calculated according to the average b times per year half magnetic pole short-circuit working condition, the larger value of the fatigue accumulated damage coefficients is taken as the total fatigue accumulated damage coefficient of the upper end shaft of the generator, and the service life calculation value of the upper end shaft of the generator is calculated.
Ninthly, analyzing the rigidity and the strength of the elastic oil tank and calculating the fatigue strength
Testing the mechanical property of the elastic oil tank material, and determining the elastic modulus, the yield limit and the strength limit; and carrying out fatigue test on the elastic oil tank material to determine an S-N curve. And (3) carrying out stress calculation on the elastic oil tank, analyzing the maximum profit position and stress distribution of the elastic oil tank, simultaneously carrying out a water thrust test, and testing the axial water thrust and the pulsation change value thereof under different working conditions. And calculating the service life calculation value of the elastic oil tank according to the water thrust test data, the dynamic stress calculation result of the elastic oil tank, the fatigue test data of the material of the elastic oil tank, the fatigue loss calculation and the like.
Stiffness analysis and fatigue strength calculation of air brake at R
The calculation conditions of the brake air brake rigidity strength analysis and the fatigue strength calculation are completely the same as those of the elastic oil tank.
The calculation working condition of the air cooler is calculated by analyzing the rigidity strength and the fatigue strength of the air cooler, and the calculation steps are completely the same as those of the stator frame part.
The calculation working conditions of the upper end shaft fastening bolt, the rotor bracket fastening bolt, the stator base fastening bolt and the upper frame fastening bolt are calculated through strength analysis and fatigue strength, and the calculation steps are completely the same as those of the water turbine top cover connecting bolt.
(3) Estimation of remaining service life of over-service hydroelectric generating set
In order to quantify the safety evaluation and the residual service life estimation of the service-exceeding water-turbine generator set, the invention provides that the weight coefficient distribution is carried out on the service life calculated value of each key component influencing the residual service life of the water-turbine generator set, so that the health state value of the water-turbine generator set in the current state and the calculated value of the service life of the water-turbine generator set are calculated, and the calculated value of the residual service life of the water-turbine generator set is further given.
Therefore, whether the distribution of the weight of each key component can eliminate the influence of subjectivity to the maximum extent or not is the key for determining whether the unit safety evaluation and the residual service life estimation are scientific or not. And distributing the weight coefficients according to the probability of the accident, the loss degree, the risk degree and the influence range caused by the accident, the range, the content, the quantity, the characteristics and the like of the evaluation items of the water turbine part and the generator part. The invention provides that aiming at different types (mixed flow type, axial flow type, through flow type, impact type and the like) of hydroelectric generating sets, the sum of the weight coefficients of all key components of a water turbine part on the service life of the hydroelectric generating set is 0.55, and the sum of the weight coefficients of all key components of a generator part on the service life of the hydroelectric generating set is 0.45.
The distribution of the weight coefficients of various key components of different types of hydroelectric generating sets, which influence the service life of the sets, is as follows:
part of water turbine
For a francis turbine, the key component weight coefficients are distributed as follows:
0.06 of top cover, 0.04 of seat ring, 0.03 of control ring, 0.05 of guide vane, 0.03 of servomotor, 0.12 of rotating wheel, 0.05 of volute, 0.05 of main shaft of water turbine, 0.03 of water guide bearing, 0.01 of tail water pipe disk valve, 0.02 of volute entrance door, 0.02 of conical pipe entrance door, 0.01 of top cover connecting bolt, 0.01 of main shaft connecting bolt, 0.01 of drain cone fastening bolt and 0.01 of main shaft seal.
For an axial flow turbine, the key component weighting factors are assigned as follows:
0.06 part of top cover, 0.04 part of support cover, 0.03 part of control ring, 0.05 part of guide vane, 0.03 part of servomotor, 0.12 part of runner, 0.03 part of oil receiver, 0.05 part of main shaft of water turbine, 0.03 part of water guide bearing, 0.01 part of tail water pipe disk valve, 0.02 part of volute entrance door, 0.02 part of runner chamber entrance door, 0.02 part of cone entrance door, 0.01 part of top cover connecting bolt, 0.01 part of blade connecting bolt, 0.01 part of main shaft connecting bolt and 0.01 part of drain cone fastening bolt.
For a flow turbine, the key component weighting factors are assigned as follows:
0.1 tubular seat, 0.04 inner water distribution ring, 0.04 outer water distribution ring, 0.02 runner chamber, 0.05 guide vane, 0.03 servomotor, 0.12 runner, 0.03 oil receiver, 0.01 water guide cone, 0.05 water turbine main shaft, 0.03 water guide bearing, 0.01 blade connecting bolt, 0.01 main shaft connecting bolt, 0.01 heavy hammer and 0.01 main shaft seal.
For impulse turbines, the key component weight coefficients are assigned as follows:
0.05 part of water distribution ring pipe, 0.05 part of direct current spray pipe, 0.03 part of spray needle, 0.03 part of deflector, 0.02 part of mouth ring, 0.03 part of spray needle servomotor, 0.03 part of deflector servomotor, 0.12 part of rotating wheel, 0.05 part of main shaft of water turbine, 0.03 part of water guide bearing, 0.03 part of machine shell, 0.04 part of water stabilizing grid, 0.01 part of rotating wheel connecting bolt, 0.01 part of main shaft connecting bolt, and 0.02 part of rotating wheel chamber entrance door.
Part of generator
0.08 of a stator frame, 0.03 of an upper frame, 0.03 of a lower frame (thrust support), 0.03 of a magnetic pole, 0.03 of a magnetic yoke, 0.02 of a rotor support, 0.05 of a main shaft of a generator, 0.03 of an upper/lower guide bearing, 0.03 of a thrust bearing, 0.02 of an upper end shaft of the generator, 0.02 of an elastic oil tank, 0.02 of a brake air brake, 0.02 of an air cooler, 0.01 of an upper end shaft fastening bolt, 0.01 of a rotor support fastening bolt, 0.01 of a stator frame fastening bolt and 0.01 of an upper frame fastening bolt.
The service life calculation value of each key component is obtained by analyzing the rigidity and the fatigue strength of each key component of the unit, the service life calculation value of the service life exceeding service hydroelectric generating set can be calculated according to the service life calculation value of each key component and the weight coefficient of each key component in the table on the influence of the service life of the hydroelectric generating set, and the remaining service life calculation value of the service life exceeding service hydroelectric generating set can be calculated by subtracting the production period from the production period, wherein the following formula is shown in detail:
in the formula:
pithe weight coefficient of the influence of each key part on the service life of the water-turbine generator set;
Pi-a calculated value of the service life of each key component;
p is the production period of the super-service hydroelectric generating set;
p' -calculating the residual service life of the over-service water turbine generator set.
It should be noted that each power generation enterpriseWhen the residual service life of the water-turbine generator set is estimated, the weight coefficient n influencing the service life of the water-turbine generator set by each key component can be combined with the difference of the characteristics of the unit system and the safety evaluation management systemiIf the hydro-generator set does not have individual key components in the list, the corresponding weight coefficient is not considered, and if the hydro-generator set does not have other key components which influence the residual service life of the hydro-generator set, certain weight coefficients can be added and given as appropriate, so as to improve the scientificity and operability of the life estimation of the hydro-generator set, but the modified different key components and the weight coefficients thereof still belong to the protection scope of the invention.
The specific evaluation criteria for estimating the remaining service life of the water-turbine generator set based on the fatigue strength calculation of the key components and the weight coefficients thereof are further described below with reference to the safety evaluation and remaining service life estimation examples of the axial-flow Kaplan water-turbine generator set in which a certain power station is in service for a certain period of time, but the specific evaluation criteria should not be construed as limiting the invention.
(1) Shafting critical speed calculation
Calculating the critical rotating speed of the front 2 orders of a shaft system of the hydroelectric generating set by adopting a finite element method to obtain the critical rotating speed of the shaft system far exceeding the working rotating speed and the runaway rotating speed of the unit; the natural frequency of the torsional vibration of the front 2 orders of the shafting of the computer set is avoided from the frequency conversion and the possible excitation frequency. Therefore, the unit shafting can be judged to run safely and stably, and the unit shafting has good dynamic characteristics.
(2) Rigidity and strength analysis and fatigue strength calculation of key parts of hydroelectric generating set
Respectively calculating the calculated stress of each key component under different working conditions, analyzing and researching whether the allowable stress meeting the standard regulation is lower than the yield limit of the material or not, and whether the maximum equivalent stress appears in a local area and belongs to stress concentration or not, and accordingly judging whether the structural rigidity strength of each key component meets the design requirement or not.
Taking the top cover and the supporting cover as an example, the material is Q235A, yield limit sigmas235MPa, strengthLimit sigmabAt 375MPa, the calculated stress for the top and support caps is shown in the following table:
the maximum equivalent stress of the visible top cover and the support cover under normal operation condition and emergency shutdown condition meets the allowable stress specified by the standard and is lower than the yield limit of the material. The maximum equivalent stress is 162.99MPa, the maximum integrated displacement of the top cover and the supporting cover under the normal operation working condition and the emergency shutdown working condition is respectively 0.57mm and 1.16mm and is smaller than a standard allowable value in the aspect of integrated displacement distribution and stress concentration appearing in a local area, and the structural rigidity of the top cover and the supporting cover meets the design requirement.
Considering the design life of 40 years, calculating according to the average 10 times of emergency shutdown conditions per year after referring to relevant operation data, considering the water pressure pulsation, and calculating according to the average 625 times of water pressure pulsation per minute, the circulation times of the top cover and the supporting cover from normal operation to emergency shutdown and normal operation (considering the water pressure pulsation) are respectively 400 times and 328500000 times.
According to the rigidity intensity calculation conditions, the alternating stress amplitudes of the top cover and the support cover in two working conditions of normal operation to emergency shutdown and normal operation (considering water pressure pulsation) are 47.2MPa and 48.9MPa respectively.
The available cycle times of the alternating stress amplitude under the two working conditions of emergency shutdown and normal operation are respectively 108 and 109, the fatigue accumulated damage coefficient D is respectively 0.0000004 and 0.3285, the larger value is taken, the total fatigue accumulated damage coefficient of the top cover and the supporting cover is 0.3285, and the service life calculated value P of the stress concentration position of the top cover and the supporting cover is obtained140 ÷ 0.3285 ÷ 121 years.
The calculation steps of the rigidity strength analysis and the fatigue strength calculation of other key parts of the hydroelectric generating set are similar to those of a top cover and a support cover, the maximum equivalent stress meets the specified allowable stress value through finite element calculation and analysis, the maximum equivalent stress is lower than the yield limit of a material, and the maximum comprehensive displacement is smaller than a standard allowable value, so that the structural rigidity strength of each key part meets the design requirement. The fatigue strength is calculated by adopting an accumulated damage criterion, and the calculated value of the service life of each key part is calculated and is shown in the following table:
the water-turbine generator set is put into operation for 40 years, and the service life calculated value and the remaining service life calculated value of the overtime service water-turbine generator set are obtained through weighted summation and are as follows:
P′＝138-40＝98
the calculated value of the residual service life of the out-of-service water-turbine generator set is 98 years, the calculated value of the service life is considered to be smaller, the dynamic state of the upper frame is closely concerned when the water-turbine generator set is in delayed operation, meanwhile, the calculated value of the service life of the elastic oil tank is also smaller, and the elastic oil tank is recommended to be replaced in time, so that the normal operation of the generator set is prevented from being influenced due to the damage of the elastic oil tank. In addition, each key part of the water turbine generator set needs to be subjected to nondestructive testing when necessary, and the defect part is timely and correspondingly treated, so that the operation risk and hidden danger are reduced.
The invention divides the turbine units into different types of key components for distribution of weighting factors aiming at typical design and construction conditions of the turbine units of different models such as mixed flow type, axial flow type, through flow type and the like, because the power station has specificity, the listed key components can have the conditions of incomplete coverage or no part of the listed key components of the power station unit, and the like, the listed key components are difficult to completely cover all the key components of the unit, and certain weighting coefficients can be added and given as appropriate during specific evaluation, but the invention still belongs to the protection scope of the invention.
At present, the maximum equivalent stress calculation value of each key component of the hydraulic generator set under the working conditions of normal operation, emergency shutdown and the like and the fatigue life calculation according to the linear accumulated damage theory are mature technologies, the method is provided according to the example of the over-service safety evaluation of a large power station set, the calculation is carried out by referring to the calculation methods of the fatigue life of the components of a plurality of domestic large hydraulic generator set well-known manufacturers, in addition, other calculation methods exist in the fatigue calculation, and the method is not specifically mentioned in the patent, but still belongs to the protection scope of the invention.
Those not described in detail in this specification are within the skill of the art.
Claims (9)
1. A method for evaluating the residual service life of a hydroelectric generating set based on key components is characterized by comprising the following steps:
A. finding out key components influencing the service life of the super-service water-turbine generator set according to the state of the water-turbine generator set;
B. performing rigidity strength analysis and fatigue strength calculation on each key component;
C. calculating the service life calculated value of each key part according to the rigidity strength analysis and fatigue strength calculation results of each key part
D. According to the service life calculated value of each key component and the weight coefficient of each key component influencing the service life of the water-turbine generator set, carrying out weighted summation calculation to obtain the service life calculated value of the service life of the water-turbine generator set in the exceeding period;
E. and subtracting the operating years from the operating life calculation value of the overdimensioned hydroelectric generating set obtained by calculation, and calculating to obtain the remaining operating life calculation value of the overdimensioned hydroelectric generating set.
2. The method for evaluating the remaining service life of the hydroelectric generating set based on the key components as claimed in claim 1, wherein: in the step A, key parts influencing the service life of the water turbine generator set in the overtime service are found out through finite element calculation, evaluation and analysis of the rigidity strength and fatigue damage of the runner, the top cover, the seat ring, the main shaft, the inlet door and the tail water pipe disc valve, wherein the evaluation is carried out on the operating condition of the water turbine in the overtime service, the evaluation is carried out on the operating stability of the water turbine, the evaluation is carried out on the parameter state of the water turbine.
3. The method for evaluating the remaining service life of the hydroelectric generating set based on the key components as claimed in claim 1, wherein: in the step A, key components influencing the service life of the generator of the super-service water-turbine generator set are found out by carrying out on-site observation, flaw detection and sampling analysis on the on-site state and the parameter state of the super-service generator, the main shaft, the stator, the rotor, the thrust bearing, the guide bearing, the upper frame and the lower frame, carrying out finite element calculation evaluation analysis on the rigidity and the fatigue failure of key components of the generator, and carrying out measurement and comparative analysis on the permanent deformation of the key components.
4. The method for evaluating the remaining service life of the hydroelectric generating set based on the key components as claimed in claim 1, wherein: the sum of the weight coefficients of the influence of each key component of the water turbine part of the water turbine generator set on the service life of the water turbine generator set is 0.55, and the sum of the weight coefficients of the influence of each key component of the generator part of the water turbine generator set on the service life of the water turbine generator set is 0.45.
5. The method for evaluating the remaining service life of the hydroelectric generating set based on the key components as claimed in claim 4, wherein the method comprises the following steps: the weight coefficients of key components of the francis turbine are distributed as follows: 0.06 of top cover, 0.04 of seat ring, 0.03 of control ring, 0.05 of guide vane, 0.03 of servomotor, 0.12 of rotating wheel, 0.05 of volute, 0.05 of main shaft of water turbine, 0.03 of water guide bearing, 0.01 of tail water pipe disk valve, 0.02 of volute entrance door, 0.02 of conical pipe entrance door, 0.01 of top cover connecting bolt, 0.01 of main shaft connecting bolt, 0.01 of drain cone fastening bolt and 0.01 of main shaft seal.
6. The method for evaluating the remaining service life of the hydroelectric generating set based on the key components as claimed in claim 4, wherein the method comprises the following steps: the weight coefficients of key components of the axial flow hydraulic turbine are distributed as follows: 0.06 part of top cover, 0.04 part of support cover, 0.03 part of control ring, 0.05 part of guide vane, 0.03 part of servomotor, 0.12 part of runner, 0.03 part of oil receiver, 0.05 part of main shaft of water turbine, 0.03 part of water guide bearing, 0.01 part of tail water pipe disk valve, 0.02 part of volute entrance door, 0.02 part of runner chamber entrance door, 0.02 part of cone entrance door, 0.01 part of top cover connecting bolt, 0.01 part of blade connecting bolt, 0.01 part of main shaft connecting bolt and 0.01 part of drain cone fastening bolt.
7. The method for evaluating the remaining service life of the hydroelectric generating set based on the key components as claimed in claim 4, wherein the method comprises the following steps: the key component weighting factors for the flow turbine are assigned as follows: 0.1 tubular seat, 0.04 inner water distribution ring, 0.04 outer water distribution ring, 0.02 runner chamber, 0.05 guide vane, 0.03 servomotor, 0.12 runner, 0.03 oil receiver, 0.01 water guide cone, 0.05 water turbine main shaft, 0.03 water guide bearing, 0.01 blade connecting bolt, 0.01 main shaft connecting bolt, 0.01 heavy hammer and 0.01 main shaft seal.
8. The method for evaluating the remaining service life of the hydroelectric generating set based on the key components as claimed in claim 4, wherein the method comprises the following steps: the weighting coefficients of key components of the impulse turbine are distributed as follows: 0.05 part of water distribution ring pipe, 0.05 part of direct current spray pipe, 0.03 part of spray needle, 0.03 part of deflector, 0.02 part of mouth ring, 0.03 part of spray needle servomotor, 0.03 part of deflector servomotor, 0.12 part of rotating wheel, 0.05 part of main shaft of water turbine, 0.03 part of water guide bearing, 0.03 part of machine shell, 0.04 part of water stabilizing grid, 0.01 part of rotating wheel connecting bolt, 0.01 part of main shaft connecting bolt, and 0.02 part of rotating wheel chamber entrance door.
9. The method for evaluating the remaining service life of the hydroelectric generating set based on the key components as claimed in claim 4, wherein the method comprises the following steps: the weight coefficients of key components of the generator are distributed as follows: 0.08 of a stator frame, 0.03 of an upper frame, 0.03 of a lower frame (thrust support), 0.03 of a magnetic pole, 0.03 of a magnetic yoke, 0.02 of a rotor support, 0.05 of a main shaft of a generator, 0.03 of an upper/lower guide bearing, 0.03 of a thrust bearing, 0.02 of an upper end shaft of the generator, 0.02 of an elastic oil tank, 0.02 of a brake air brake, 0.02 of an air cooler, 0.01 of an upper end shaft fastening bolt, 0.01 of a rotor support fastening bolt, 0.01 of a stator frame fastening bolt and 0.01 of an upper frame fastening bolt.
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