CN113029436B - Method for dynamically balancing long shaft of three-cylinder two-exhaust 200MW steam turbine generator assembly - Google Patents
Method for dynamically balancing long shaft of three-cylinder two-exhaust 200MW steam turbine generator assembly Download PDFInfo
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- CN113029436B CN113029436B CN202110224266.4A CN202110224266A CN113029436B CN 113029436 B CN113029436 B CN 113029436B CN 202110224266 A CN202110224266 A CN 202110224266A CN 113029436 B CN113029436 B CN 113029436B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/02—Details of balancing machines or devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/14—Determining imbalance
- G01M1/16—Determining imbalance by oscillating or rotating the body to be tested
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Abstract
The invention relates to a method for dynamically balancing the long shaft of a three-cylinder two-exhaust 200MW steam turbine generator, which comprises the following steps: step one, testing vibration conditions of a unit in a stable state through a vibration testing instrument, wherein test data comprise frequency multiplication amplitude values and phases of 3W X direction, 4W X direction and 5W X direction; step two, respectively selecting five groups of frequency doubling vibration data in the X direction of 3 watts, the X direction of 4 watts and the X direction of 5 watts, respectively taking average values of amplitude and phase, and separating the data in each group for 10 minutes; step three, determining a weighting plane and a weighting angle according to the vibration data of the step two; step four, determining the weight according to the vibration data in the step two; and fifthly, starting the unit after the counterweight is completed, and completing dynamic balance work of the extension shaft when the amplitude reduction reaches more than 50%. The invention can effectively reduce the vibration amplitude of the whole shafting, and has obvious effect compared with the traditional influence coefficient method and hysteresis angle method.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and particularly relates to a method for dynamically balancing a long shaft of a three-cylinder two-exhaust 200MW steam turbine generator.
Background
The domestic 200MW three-cylinder two-exhaust steam turbine generator set almost has the problem that 3 watt shaft vibration exceeds standard in different degrees due to design and processing, and the 3X vibration amplitude is 120-180 mu m generally, so that the safe and stable operation of the generator set is seriously affected. The current field balance method cannot effectively reduce the 3X vibration amplitude, even if the 3X vibration amplitude can be reduced occasionally, the vibration amplitude of 4 watts and 5 watts can be increased abnormally, and the vibration amplitude of each watt of the whole shafting cannot be reduced effectively.
Disclosure of Invention
The invention aims to provide a method for dynamically balancing the long shaft of a three-cylinder two-exhaust 200MW steam turbine generator, which comprises the steps of measuring 3W, 4W and 5W shaft vibration data through a vibration instrument, determining a weighting position and a weighting angle according to a frequency multiplication phase relation of 3W, 4W and 5W, determining weighting quality according to the amplitude of 3X shaft vibration, and controlling the vibration amplitude of the whole shaft system within a qualified range through on-site dynamic balance.
The invention provides a method for dynamically balancing the long shaft of a three-cylinder two-exhaust 200MW steam turbine generator set, which comprises the following steps:
step one, testing vibration conditions of a unit in a stable state through a vibration testing instrument, wherein test data comprise frequency multiplication amplitude values and phases of 3W X direction, 4W X direction and 5W X direction;
step two, respectively selecting five groups of frequency doubling vibration data in the X direction of 3 watts, the X direction of 4 watts and the X direction of 5 watts, respectively taking average values of amplitude and phase, and separating the data in each group for 10 minutes;
step three, determining a weighted plane and a weighted angle according to the vibration data in the step two:
(1) Comparing the 3W X direction phase with the 4W X direction phase, wherein the difference is required to be smaller than 30 degrees; comparing the 3W X direction phase with the 5W X direction phase, wherein the difference is required to be smaller than 80 degrees;
(2) When condition (1) is satisfied and the 5 w X-direction phase is less than the 3 w X-direction phase: calculating by taking a 3W X-direction phase as a reference, selecting a hysteresis angle of 10 degrees, and selecting a coupler low-pressure side in a aggravated position;
(3) When condition (1) is satisfied and the 5 w X-direction phase is greater than the 3 w X-direction phase: calculating by taking a 3W X-direction phase as a reference, selecting a hysteresis angle of 45 degrees, and selecting a middle pressure side of the coupler in a weight position;
(4) When the condition (1) is not satisfied, selecting weighting planes on two sides of the low-pressure rotor to perform dynamic balance;
step four, determining the weight according to the vibration data in the step two:
taking the amplitude of 3W X-direction vibration as a reference, the weight of each 100 g can be reduced by 15 mu m in 3W X-direction vibration;
and fifthly, starting the unit after the counterweight is completed, and completing dynamic balance work of the extension shaft when the amplitude reduction reaches more than 50%.
Further, in the first step, frequency doubling vibration amplitudes of 3 w X direction, 4 w X direction and 5 w X direction are measured.
Further, the selection of the weighting plane in the third step is determined according to the relation among the phases of 3 w X direction, 4 w X direction and 5 w X direction.
By means of the scheme, the method for dynamically balancing the long shaft of the three-cylinder two-exhaust 200MW steam turbine generator assembly is adopted, the weighting axial position and the weighting phase on the long shaft are determined according to a frequency multiplication phase relation through vibration tests on 3W, 4W and 5W, and the weighting quality is determined according to a frequency multiplication vibration amplitude in the 3W X direction, so that the vibration amplitude of the whole shaft system can be effectively reduced, and the effect is obvious compared with that of the traditional influence coefficient method and the traditional lag angle method.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
A method for dynamically balancing the long shaft of a three-cylinder two-exhaust 200MW steam turbine generator assembly comprises the following steps:
1. frequency doubling vibration data of 3 watts, 4 watts and 5 watts were collected using a vibration testing instrument.
2. And (3) processing the vibration data acquired in the step one, and acquiring frequency doubling vibration data in the running process of the rotor by using a vibration analyzer. And taking a group of frequency doubling vibration data every 10 minutes, taking five groups in total, respectively taking average values of vibration amplitude values and phases in the five groups of data, and calculating to obtain frequency doubling amplitude values and phases in the 3W X direction, the 4W X direction and the 5W X direction.
3. And (3) determining the weighted axial position and the phase of the weighted position according to the frequency multiplication phase obtained in the step two.
4. And (3) determining the weight according to the 3W X-direction frequency multiplication amplitude obtained in the step (II).
5. And starting the unit after the counterweight is finished, monitoring vibration data, and finishing the dynamic balance test of the unit when the amplitude reduction reaches more than 50%.
The method for dynamically balancing the long shaft of the three-cylinder two-exhaust 200MW steam turbine generator assembly, by testing 3W, 4W and 5W vibration, determines the weighting axial position and the weighting phase on the long shaft according to a frequency doubling phase relation and determines the weighting quality according to a frequency doubling vibration amplitude of 3W X, can effectively reduce the vibration amplitude of the whole shaft system, has obvious effect compared with the traditional influence coefficient method and hysteresis angle method, and has very important significance.
Embodiment one:
a method for dynamically balancing the long shaft of a three-cylinder two-exhaust 200MW steam turbine generator assembly is realized according to the following steps:
1. and (3) installing a vibration testing instrument, and accurately measuring frequency doubling vibration amplitude and phase of 3W X direction, 4W X direction and 5W X direction.
2. And taking an average value of vibration data in a period of time, and furthest reducing the influence of other factors on vibration.
3. And determining the axial position of the emphasis according to the relation among 3W X direction, 4W X direction and 5W X direction frequency doubling phase, and determining the emphasis phase according to the hysteresis angle after the axial position is determined.
(1) Comparing the 3W X direction phase with the 4W X direction phase, wherein the difference is required to be smaller than 30 degrees; comparing the 3 w X-direction and 5 w X-direction phases, the difference is required to be less than 80 °.
(2) When condition (1) is satisfied and the 5 w X-direction phase is less than the 3 w X-direction phase: the 3W X-direction phase is used as a reference for calculation, the hysteresis angle is selected to be 10 degrees, and the aggravated position is selected to be at the low pressure side of the coupler.
(3) When condition (1) is satisfied and the 5 w X-direction phase is greater than the 3 w X-direction phase: the 3W X-direction phase is used as a reference for calculation, the hysteresis angle is selected to be 45 degrees, and the aggravated position is selected to be the middle pressure side of the coupler.
(4) And (3) when the condition (1) is not met, selecting the weighting planes on the two sides of the low-pressure rotor to perform dynamic balance.
4. And (3) obtaining the amplitude of the 3W X-direction vibration according to the second step, and calculating according to the condition that the amplitude can be reduced by 15 mu m per 100 g of weight, so as to determine the weight.
5. After the step four is completed, the unit starts to measure vibration data, and the reduction of the vibration data reaches more than 50% to complete the on-site dynamic balance test.
Embodiment two: the first difference between this embodiment and the embodiment is that: in the third step, the phase difference value of the 3W X direction and the 4W X direction is required to be smaller than 40 degrees. The other is the same as in the first embodiment.
Embodiment III: the first or second difference between this embodiment and the first embodiment is that: in the third step, the phase difference between the 3W X direction and the 5W X direction is smaller than 90 degrees. The other is the same as in the first or second embodiment.
Embodiment four: the difference between this embodiment and the first, second or third embodiment is that: in the fourth step, the amplitude can be reduced by 20 μm for every 100 g weight. The other is the same as in the first or second embodiment.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and it should be noted that it is possible for those skilled in the art to make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims (3)
1. The method for dynamically balancing the long shaft of the three-cylinder two-exhaust 200MW steam turbine generator assembly is characterized by comprising the following steps of:
step one, testing vibration conditions of a unit in a stable state through a vibration testing instrument, wherein test data comprise frequency multiplication amplitude values and phases of 3W X direction, 4W X direction and 5W X direction;
step two, respectively selecting five groups of frequency doubling vibration data in the X direction of 3 watts, the X direction of 4 watts and the X direction of 5 watts, respectively taking average values of amplitude and phase, and separating the data in each group for 10 minutes;
step three, determining a weighted plane and a weighted angle according to the vibration data in the step two:
(1) Comparing the 3W X direction phase with the 4W X direction phase, wherein the difference is required to be smaller than 30 degrees; comparing the 3W X direction phase with the 5W X direction phase, wherein the difference is required to be smaller than 80 degrees;
(2) When condition (1) is satisfied and the 5 w X-direction phase is less than the 3 w X-direction phase: calculating by taking a 3W X-direction phase as a reference, selecting a hysteresis angle of 10 degrees, and selecting a coupler low-pressure side in a aggravated position;
(3) When condition (1) is satisfied and the 5 w X-direction phase is greater than the 3 w X-direction phase: calculating by taking a 3W X-direction phase as a reference, selecting a hysteresis angle of 45 degrees, and selecting a middle pressure side of the coupler in a weight position;
(4) When the condition (1) is not satisfied, selecting weighting planes on two sides of the low-pressure rotor to perform dynamic balance;
step four, determining the weight according to the vibration data in the step two:
taking the amplitude of 3W X-direction vibration as a reference, the weight of each 100 g can be reduced by 15 mu m in 3W X-direction vibration;
and fifthly, starting the unit after the counterweight is completed, and completing dynamic balance work of the extension shaft when the amplitude reduction reaches more than 50%.
2. The method for dynamically balancing the long shaft of a three-cylinder two-exhaust 200MW steam turbine generator set according to claim 1, wherein in the first step, frequency doubling vibration amplitudes in the directions of 3W X, 4W X and 5W X are measured.
3. The method for dynamically balancing the long shaft of a three-cylinder two-exhaust 200MW steam turbine generator set according to claim 1, wherein the selection of the weight adding plane in the step three is determined according to the relationship among the phases of 3W X direction, 4W X direction and 5W X direction.
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