Method for identifying seal tile rub based on variable parameter test correlation vibration change rate

Abstract

The present disclosure provides a method and system for identifying seal shoe rub based on variable parameter test correlation vibration change rate, which comprises obtaining relative shaft vibration data at the generator bearing during the operation of the steam turbine generator unit; judging whether the relative shaft vibration of the steam turbine generator unit meets the basic characteristics of seal shoe rub based on the relative shaft vibration data; if it meets, taking the seal oil temperature, the excitation current, the hydrogen temperature and the vacuum pressure as variables, respectively, and controlling the adjustment of the seal oil temperature, the excitation current, the hydrogen temperature and the vacuum pressure according to the corresponding preset control rules to perform variable seal oil temperature test, variable excitation current test, variable hydrogen temperature test and variable vacuum test, and obtain corresponding test vibration data; judging whether the steam turbine generator unit has seal shoe rub based on the corresponding test vibration data. According to the method of the present disclosure, whether the steam turbine rotor has seal shoe rub fault can be identified in time and accurately.

Description

Technical Field

[0001] This disclosure pertains to the field of power machinery engineering, and particularly relates to a method for identifying the rubbing of sealing tiles based on the vibration change rate associated with variable parameter tests. Background Technology

[0002] With the continuous adjustment of power supply structure, the economic considerations of thermal power generating units are becoming increasingly important. In order to reduce leakage (steam, oil, hydrogen), the dynamic and static clearances of large rotating machinery are usually designed to be very small. During installation, maintenance and operation, slight carelessness can easily cause dynamic and static friction, affecting the safe and stable operation of the unit. The sealing rings are installed on the inner side of the bearings at both ends of the generator rotor. Their main function is to prevent the cooling medium hydrogen from flowing outward along the gap between the dynamic and static parts at the ends. Sealing oil is injected into the gap between the bearing and the shaft. When the rotor rotates, the sealing ring can float freely on the shaft, forming an oil film between the sealing ring and the journal, isolating hydrogen from air. Therefore, the radial clearance at the sealing ring location is generally designed to be small. Moreover, since the sealing ring is located near the high point of the second-order vibration mode of the generator rotor, the thermal bending caused by friction at this location will be more sensitive to vibration.

[0003] The generator rotor structure is complex, involving excitation systems, hydrogen cooling systems, water cooling systems, sealing oil systems, etc. These systems are related to many parameters during operation. Some electrical and mechanical defects (inter-turn short circuits, obstructed winding expansion, blocked cooling air ducts, etc.) can cause abnormal vibration of the generator rotor. Moreover, these faults have similar characteristics to sealing tile rubbing faults in terms of vibration manifestations, making them difficult to distinguish and identify at present. Against this background, the accurate identification and diagnosis of sealing tile rubbing faults is particularly urgent and important. Summary of the Invention

[0004] This disclosure aims to at least partially address one of the technical problems in the related art. To this end, this disclosure provides a method and system for identifying sealing tile rubbing based on the rate of vibration change correlated with variable parameter tests. The main purpose is to promptly and accurately identify whether a turbine rotor has experienced sealing tile rubbing failure.

[0005] According to a first aspect of this disclosure, a method for identifying sealing tile rubbing based on the rate of vibration change correlated with variable parameter tests is provided, comprising:

[0006] Acquire relative shaft vibration data at the generator bearing during the operation of the steam turbine generator set;

[0007] Based on the relative shaft vibration data, determine whether the relative shaft vibration of the steam turbine generator set meets the basic characteristics of sealing tile rubbing.

[0008] If the conditions are met, the sealing oil temperature, excitation current, hydrogen temperature, and vacuum pressure are used as variables, respectively. The sealing oil temperature, excitation current, hydrogen temperature, and vacuum pressure are controlled and adjusted according to the corresponding preset control rules to conduct variable sealing oil temperature test, variable excitation current test, variable hydrogen temperature test, and variable vacuum test, and the corresponding test vibration data are obtained.

[0009] Determine whether the turbine generator set has experienced sealing tile rubbing based on the corresponding test vibration data.

[0010] In one embodiment of this disclosure, determining whether the relative shaft vibration of the turbine generator set satisfies the basic characteristics of sealing tile rubbing based on the relative shaft vibration data includes: performing trend analysis on the relative shaft vibration data to determine the target measuring point with the largest vibration change amplitude; if the target measuring point exhibits slow fluctuation and the vibration of at least one adjacent measuring point of the target measuring point changes synchronously, then performing spectrum analysis on the relative shaft vibration data to determine whether the dominant frequency during the generator relative shaft vibration change is a power frequency component; if so, then the basic characteristics of sealing tile rubbing are satisfied.

[0011] In one embodiment of this disclosure, the step of controlling and adjusting the sealing oil temperature, excitation current, hydrogen temperature, and vacuum pressure according to corresponding preset control rules to conduct variable sealing oil temperature tests, variable excitation current tests, variable hydrogen temperature tests, and variable vacuum tests, and acquiring corresponding test vibration data, includes: controlling the active load, excitation current, vacuum pressure, and hydrogen temperature to remain constant, and conducting variable sealing oil temperature tests on the generator; during the test, controlling and adjusting the sealing oil temperature once every first preset time interval, and sequentially controlling the sealing oil temperature to the lower limit value, the middle value, and the upper limit value; and acquiring the first test vibration data during the entire variable sealing oil temperature test period.

[0012] In one embodiment of this disclosure, the step of controlling and adjusting the sealing oil temperature, excitation current, hydrogen temperature, and vacuum pressure according to corresponding preset control rules to conduct variable sealing oil temperature test, variable excitation current test, variable hydrogen temperature test, and variable vacuum test, and acquiring corresponding test vibration data, includes: controlling the active load, sealing oil temperature, vacuum pressure, and hydrogen temperature to remain constant, and conducting a variable excitation current test on the generator; during the test, controlling and adjusting the excitation current once every second preset time interval, increasing the excitation current according to the current step size each time, until the excitation current is controlled at the rated value of the excitation current, wherein the current step size is obtained based on a preset proportion of the rated value of the excitation current; and acquiring second test vibration data during the entire variable excitation current test period.

[0013] In one embodiment of this disclosure, the step of controlling and adjusting the sealing oil temperature, excitation current, hydrogen temperature, and vacuum pressure according to corresponding preset control rules to conduct variable sealing oil temperature test, variable excitation current test, variable hydrogen temperature test, and variable vacuum test, and acquiring corresponding test vibration data, includes: controlling the active load, excitation current, vacuum pressure, and sealing oil temperature to remain constant, and conducting a variable hydrogen temperature test on the generator; during the test, controlling and adjusting the hydrogen temperature once every third preset time interval, sequentially controlling the hydrogen temperature to the lower limit, the middle value, and the upper limit value; and acquiring the third test vibration data during the entire variable hydrogen temperature test period.

[0014] In one embodiment of this disclosure, the step of controlling and adjusting the sealing oil temperature, excitation current, hydrogen temperature, and vacuum pressure according to corresponding preset control rules to conduct variable sealing oil temperature test, variable excitation current test, variable hydrogen temperature test, and variable vacuum test, and to obtain corresponding test vibration data, includes: controlling the active load, excitation current, sealing oil temperature, and hydrogen temperature to remain constant, and performing a variable vacuum test on the generator; during the test, the vacuum is disturbed once every fourth preset time interval, so that the change in vacuum pressure each time exceeds the preset pressure difference; and the fourth test vibration data during the entire variable vacuum test period is obtained.

[0015] In one embodiment of this disclosure, determining whether the turbine generator set has experienced sealing tile rubbing based on corresponding test vibration data includes: based on the first test vibration data, obtaining the vibration fluctuation amplitude, peak value, number of peaks, and vibration change rate during the entire variable sealing oil temperature test; from the initial increase in sealing oil temperature to the end of the test, if the vibration fluctuation amplitude and peak value both show a decreasing trend, or the number of peaks and vibration change rate meet the rubbing requirements, then the turbine generator set has experienced sealing tile rubbing; otherwise, based on the second test vibration data, obtaining the change rate of vibration change rate and vibration peak value within a first set time period after each change in excitation current; if the change rate is absolutely... If the value is greater than the preset percentage of the change rate and the number of vibration peaks does not exceed the preset number, then the turbine generator set has not experienced sealing tile rubbing. Otherwise, based on the third test vibration data, the vibration fluctuation amplitude, peak value, number of peaks, and vibration change rate during the entire variable hydrogen temperature test are obtained. From the first increase in hydrogen temperature to the end of the test, if the vibration fluctuation amplitude and peak value both show a decreasing trend, or the number of peaks and vibration change rate meet the rubbing requirements, then based on the fourth test vibration data, the change rate of the vibration change rate within the second set time period after each change in vacuum pressure is obtained. If the absolute value of the change rate is greater than the preset percentage of the change rate, then the turbine generator set has experienced sealing tile rubbing.

[0016] According to a second aspect of this disclosure, a system for identifying sealing tile rubbing based on the rate of vibration change correlated with variable parameter tests is also provided, comprising:

[0017] The acquisition module is used to acquire relative shaft vibration data at the generator bearing during the operation of the steam turbine generator set;

[0018] The first judgment module is used to determine whether the relative shaft vibration of the turbine generator set meets the basic characteristics of sealing tile rubbing based on the relative shaft vibration data.

[0019] The control module is used to control and adjust the sealing oil temperature, excitation current, hydrogen temperature, and vacuum pressure according to the corresponding preset control rules, if the conditions are met, so as to conduct variable sealing oil temperature test, variable excitation current test, variable hydrogen temperature test, and variable vacuum test, and obtain the corresponding test vibration data.

[0020] The second judgment module is used to determine whether the turbine generator set has experienced sealing tile rubbing based on the corresponding test vibration data.

[0021] In one embodiment of this disclosure, the first judgment module is specifically used to: perform trend analysis on the relative shaft vibration data to determine the target measuring point with the largest vibration change amplitude; if the target measuring point experiences slow fluctuation and the vibration of at least one adjacent measuring point of the target measuring point changes synchronously, then perform spectrum analysis on the relative shaft vibration data to determine whether the dominant frequency during the generator relative shaft vibration change is a power frequency component, and if so, then the basic characteristics of sealing tile rubbing are satisfied.

[0022] According to a third aspect of this disclosure, a device for identifying sealing tile rubbing based on the rate of change of vibration associated with a variable parameter test is also provided, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the method for identifying sealing tile rubbing based on the rate of change of vibration associated with a variable parameter test proposed in the first aspect of this disclosure.

[0023] In one or more embodiments of this disclosure, relative shaft vibration data at the generator bearing is acquired during the operation of the turbine generator set. Based on the relative shaft vibration data, it is determined whether the relative shaft vibration of the turbine generator set meets the basic characteristics of sealing tile rubbing. If it does, the sealing oil temperature, excitation current, hydrogen temperature, and vacuum pressure are controlled and adjusted according to the corresponding preset control rules to conduct variable sealing oil temperature test, variable excitation current test, variable hydrogen temperature test, and variable vacuum test, and the corresponding test vibration data is acquired. Based on the corresponding test vibration data, it is determined whether the turbine generator set has experienced sealing tile rubbing. In this case, when the relative shaft vibration meets the basic characteristics of sealing tile rubbing, the relevant operating parameters (i.e., excitation current, sealing oil temperature, hydrogen temperature, and vacuum pressure) are adjusted to conduct tests, and the vibration data of the turbine generator set during the test is collected. The corresponding test vibration data is then used to determine whether a sealing tile rubbing fault has occurred. Thus, it is possible to identify whether the turbine rotor has experienced a sealing tile rubbing fault in a timely and accurate manner.

[0024] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0026] Figure 1 This diagram illustrates a process flow of a method for identifying sealing tile rubbing based on the rate of vibration change associated with variable parameter tests, as provided in an embodiment of this disclosure.

[0027] Figure 2 This invention discloses a vibration trend diagram during unit operation provided in an embodiment of the present invention.

[0028] Figure 3 This invention discloses a trend graph showing the relevant parameters during the variable sealing oil temperature test provided in the embodiments of this invention.

[0029] Figure 4 This invention discloses a trend graph of relevant parameters during a variable excitation current test according to an embodiment of the present invention.

[0030] Figure 5 This invention discloses a trend graph of relevant parameters during a variable hydrogen temperature test provided in an embodiment of the present invention.

[0031] Figure 6 This invention discloses a trend graph of relevant parameters during a variable vacuum test provided in an embodiment of the present invention.

[0032] Figure 7 This diagram illustrates the arrangement of measuring points according to an embodiment of the present disclosure.

[0033] Figure 8 This illustration shows a field-taken image of the wear on the sealing tile, provided in an embodiment of this disclosure.

[0034] Figure 9 This diagram shows a block diagram of a system for identifying sealing tile rubbing based on the rate of change of vibration associated with variable parameter tests, as provided in an embodiment of this disclosure.

[0035] Figure 10 This is a block diagram of a device for identifying sealing tile rubbing based on the vibration change rate associated with variable parameter test, used to implement the method for identifying sealing tile rubbing based on the vibration change rate associated with variable parameter test in the embodiments of this disclosure. Detailed Implementation

[0036] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with those of this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the embodiments of this disclosure as detailed in the appended claims.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined. It should also be understood that the term "and / or" as used in this disclosure refers to and includes any or all possible combinations of one or more associated listed items.

[0039] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting this disclosure.

[0040] This disclosure provides a method and system for identifying sealing tile rubbing based on the vibration change rate associated with variable parameter tests. The main purpose is to identify whether a turbine rotor has experienced sealing tile rubbing failure in a timely and accurate manner.

[0041] In the first embodiment, Figure 1 This diagram illustrates a flowchart of a method for identifying sealing tile rubbing based on the rate of vibration change correlated with variable parameter tests, according to an embodiment of this disclosure. Figure 1 As shown, the method for identifying sealing tile rubbing based on the rate of vibration change correlated with variable parameter tests includes:

[0042] Step S11: Obtain relative shaft vibration data at the generator bearing during the operation of the steam turbine generator set.

[0043] In step S11, the generator bearing can be a support bearing at both ends of the generator.

[0044] In step S11, there are multiple measuring points on the generator bearing. The relative shaft vibration data at the generator bearing is the relative shaft vibration data of all measuring points of the generator bearing during the operation of the steam turbine generator set over a period of time.

[0045] Step S12: Based on the relative shaft vibration data, determine whether the relative shaft vibration of the turbine generator set meets the basic characteristics of sealing tile rubbing.

[0046] In step S12, the relative shaft vibration of the turbine generator set is judged based on the relative shaft vibration data to determine whether the relative shaft vibration meets the basic characteristics of sealing tile rubbing. This includes: performing trend analysis on the relative shaft vibration data to determine the target measuring point with the largest vibration change amplitude; if the target measuring point exhibits slow fluctuation and the vibration of at least one adjacent measuring point of the target measuring point changes synchronously, then the relative shaft vibration data is subjected to spectrum analysis to determine whether the dominant frequency during the generator relative shaft vibration change is a power frequency component. If so, the basic characteristics of sealing tile rubbing are met.

[0047] Specifically, trend analysis is performed on the relative shaft vibration data of all measuring points of the generator bearing obtained in step S11 over a period of time to determine the measuring point with the largest vibration change amplitude. This measuring point with the largest vibration change amplitude is the target measuring point X1. If the vibration of the target measuring point X1 exhibits slow fluctuations, and at least one adjacent measuring point of the target measuring point X1 shows synchronous vibration changes, it indicates that the turbine generator set may have experienced sealing tile rubbing. Then, a spectrum analysis is performed. Otherwise, it indicates that the turbine generator set has not experienced sealing tile rubbing. A spectrum analysis is performed on the relative shaft vibration data to determine whether the dominant frequency during the generator's relative shaft vibration change is a power frequency (i.e., 50Hz) component. If the dominant frequency is a power frequency component, it indicates that the basic characteristics of sealing tile rubbing are met, and it can be considered that the turbine generator set may have experienced rubbing. Otherwise, it indicates that the turbine generator set has not experienced sealing tile rubbing.

[0048] The method for determining whether the vibration of target measuring point X1 exhibits slow fluctuations and whether the vibration of at least one adjacent measuring point of target measuring point X1 changes synchronously is as follows:

[0049] Determine the start time t of the vibration wave at the target measuring point X1. X10 And the vibration amplitude A corresponding to that moment X10 Set vibration amplitude A X11 Satisfy condition | A X11 -A X10 | / |A X10 |=30%, determine the vibration fluctuation of the target measuring point X1 to the vibration amplitude A. X11 The corresponding time t X11 If time t X11 With the start time t of the vibration wave X10 The difference is greater than or equal to a certain duration, such as 2 minutes, i.e., at time t. X11 Satisfying condition t X11 -t X10 If the vibration amplitude of the target measuring point X1 is ≥2 min, then the target measuring point X1 is considered to have a slow fluctuation phenomenon; the adjacent measuring point of the target measuring point X1 is X2. If the vibration amplitude of the adjacent measuring point X2 satisfies |A X21 -A X20 | / |A X20 |≥20%, of which A X21 With A X20 They are time t respectively X10 and time t X11 If the vibration value corresponding to the next adjacent measuring point X2 is considered, then it is assumed that at least one adjacent measuring point has a synchronous vibration change.

[0050] The method for determining whether the dominant frequency during the generator's relative shaft vibration variation is a power frequency component is as follows:

[0051] When the ratio of the change in power frequency component to the change in bandwidth amplitude is greater than or equal to a certain proportion, such as 70%, the dominant frequency of vibration change is considered to be the power frequency component.

[0052] Specifically: Obtain the start time t of the fluctuation. X10 The power frequency component A of the vibration of the target measuring point X1 at time X1f0 and obtain time t X11 The power frequency component A of the vibration of the target measuring point X1 at time X1f1 If condition |A is satisfied X1f1 -A X1f0 | / |A X11 -A X10 |≥70%, of which |A X1f1 -A X1f0 | represents the change in the power frequency component, |A X11 -A X10 If the amplitude of the frequency band is the change, then the dominant frequency of the vibration change is considered to be the power frequency component.

[0053] Step S13: If satisfied, the sealing oil temperature, excitation current, hydrogen temperature, and vacuum pressure are controlled and adjusted according to the corresponding preset control rules to conduct variable sealing oil temperature test, variable excitation current test, variable hydrogen temperature test, and variable vacuum test, and the corresponding test vibration data are obtained.

[0054] In step S13, considering that the relative shaft vibration data of the turbine generator set meets the basic characteristics of sealing tile rubbing, it may be caused by sealing tile rubbing fault or generator rotor thermal bending fault caused by other factors. In order to distinguish the sealing tile rubbing fault from the generator rotor thermal bending fault caused by other factors, it is necessary to conduct tests such as sealing oil temperature, excitation current, hydrogen temperature, and vacuum step by step to investigate.

[0055] In step S13, the sealing oil temperature, excitation current, hydrogen temperature, and vacuum pressure are controlled and adjusted according to the corresponding preset control rules to conduct variable sealing oil temperature test, variable excitation current test, variable hydrogen temperature test, and variable vacuum test, and to acquire the corresponding test vibration data, including:

[0056] The generator was subjected to a variable sealing oil temperature test while keeping the active load, excitation current, vacuum pressure, and hydrogen temperature constant. During the test, the sealing oil temperature was adjusted every first preset time interval, and the sealing oil temperature was controlled to be at the lower limit, the middle value, and the upper limit value in sequence. The first test vibration data during the entire variable sealing oil temperature test was obtained.

[0057] The generator was subjected to a variable excitation current test while keeping the active load, sealing oil temperature, vacuum pressure, and hydrogen temperature constant. During the test, the excitation current was adjusted every second preset time interval. Each adjustment was made by increasing the excitation current according to the current step size until the excitation current was controlled at the rated value. The current step size was obtained based on a preset ratio of the rated value of the excitation current. The second test vibration data was obtained during the entire variable excitation current test.

[0058] The active load, excitation current, vacuum pressure, and sealing oil temperature are kept constant, and a variable hydrogen temperature test is conducted on the generator. During the test, the hydrogen temperature is controlled and adjusted every third preset time interval, and the hydrogen temperature is controlled to be at the lower limit, the middle value, and the upper limit value in sequence. The vibration data of the third test during the entire variable hydrogen temperature test period are obtained.

[0059] The generator is subjected to a variable vacuum test while keeping the active load, excitation current, sealing oil temperature, and hydrogen temperature constant. During the test, the vacuum is disturbed every fourth preset time interval, so that the change in vacuum pressure exceeds the preset pressure difference each time. The vibration data of the fourth test during the entire variable vacuum test period are obtained.

[0060] Specifically, for the variable sealing oil temperature test: While ensuring that parameters such as active load, excitation current, vacuum pressure, and hydrogen temperature remain constant, a variable sealing oil temperature test is performed on the generator. First, the sealing oil inlet temperature (i.e., the sealing oil temperature) is maintained at the lower limit T value required by the unit operating procedures. omin After stabilizing for a preset period of time, such as two hours, the sealing oil temperature is increased by 3°C (i.e., the median sealing oil temperature is 3°C higher than the lower limit of the oil temperature), maintained for two hours, and then the sealing oil temperature is increased to the upper limit T value required by the unit operating procedures. omax The test was conducted for two hours, and the first test vibration data of the target measuring point X1 was obtained during the entire variable sealing oil temperature test. The time period of the entire variable sealing oil temperature test was from a certain time before the first control of the sealing oil temperature (e.g., 2 minutes before the first control of the sealing oil temperature) to the last time the sealing oil temperature was controlled and maintained for the first preset time.

[0061] For the variable excitation current test: Maintaining constant parameters such as active load, hydrogen temperature, vacuum pressure, and sealing oil temperature, conduct a variable excitation current test on the generator. Obtain the rated excitation current I0 under a certain load of the unit. Set the initial value of the unit's excitation current to I = 0.25 × I0, meaning that the excitation current is controlled and adjusted according to the initial value for the first time. Wait for a second preset time period, such as 2 hours. Then, increase the excitation current by ΔI = 0.25 × I0, where ΔI is the current step size, with a preset ratio of 0.25. Wait another 2 hours. Subsequently, gradually increase the excitation current to the rated value I0. Obtain the second test vibration data of the target measuring point X1 during the entire variable excitation current test period. The entire variable excitation current test period is from a certain time period before the first control of the excitation current (e.g., the first 2 minutes) to the last control of the excitation current to maintain the second preset time period.

[0062] For the variable hydrogen temperature test: While maintaining constant parameters such as active load, excitation current, vacuum pressure, and sealing oil temperature, the generator is subjected to a variable hydrogen temperature test. First, the hydrogen temperature is maintained at the lower limit T specified in the unit operating procedures. Hmin After stabilizing for a preset period of time, such as two hours, the hydrogen temperature is increased by 3 (i.e., the median hydrogen temperature is 3 degrees higher than the lower limit), maintained for two hours, and then the hydrogen temperature is increased to the upper limit T required by the unit operation procedure. Hmax Maintain for two hours. Acquire the third test vibration data of the target measuring point X1 during the entire variable hydrogen temperature test. The time period of the entire variable hydrogen temperature test is from a certain time before the first hydrogen temperature control (e.g., 2 minutes before the first hydrogen temperature control) to the last time the hydrogen temperature is maintained for the third preset time.

[0063] For the variable vacuum test: Ensure that parameters such as active load, excitation current, sealing oil temperature, and hydrogen temperature remain constant while performing a variable vacuum test on the generator. Conduct multiple (≥3 times) vacuum disturbance tests, each time rapidly disturbing the vacuum to a pressure change exceeding a preset pressure difference (e.g., 3 kPa), and stabilize for a fourth preset time period (e.g., two hours). Acquire the fourth test vibration data at the target measuring point X1 throughout the entire variable vacuum test period. The entire variable vacuum test period includes a certain time before the first vacuum disturbance (e.g., the first 2 minutes) until the last vacuum disturbance is maintained for the fourth preset time period.

[0064] Step S14: Determine whether the turbine generator set has experienced sealing tile rubbing based on the corresponding test vibration data.

[0065] In step S14, determining whether the turbine generator set has experienced sealing tile rubbing based on the corresponding test vibration data includes: based on the first test vibration data, obtaining the vibration fluctuation amplitude, peak value, number of peaks, and vibration change rate during the entire variable sealing oil temperature test; from the initial increase in sealing oil temperature to the end of the test, if the vibration fluctuation amplitude and peak value both show a decreasing trend, or the number of peaks and vibration change rate meet the rubbing requirements, then the turbine generator set has experienced sealing tile rubbing; otherwise, based on the second test vibration data, obtaining the change rate of vibration change rate and vibration peak value within a first set time period after each change in excitation current; if the absolute value of the change rate is large... If the change rate is within a preset proportion and the vibration peak does not exceed a preset number, then the turbine generator set does not experience sealing tile rubbing. Otherwise, based on the vibration data from the third test, the vibration fluctuation amplitude, peak value, number of peaks, and vibration change rate are obtained throughout the entire variable hydrogen temperature test. From the initial increase in hydrogen temperature to the end of the test, if the vibration fluctuation amplitude and peak value both show a decreasing trend, or if the number of peaks and vibration change rate meet the rubbing requirements, then based on the vibration data from the fourth test, the change rate of the vibration change rate within the second set time period after each change in vacuum pressure is obtained. If the absolute value of the change rate is greater than the preset proportion of the change rate, then the turbine generator set experiences sealing tile rubbing.

[0066] Among them, from the first increase of the sealing oil temperature to the end of the test, if the vibration fluctuation amplitude and peak value both show a decreasing trend, or the number of peaks and the vibration change rate meet the impact rubbing requirements, it means that from the first increase of the sealing oil temperature to the end of the test, the vibration fluctuation amplitude and peak value both show a decreasing trend, or the number of peaks does not exceed 2, and after the last peak (if there are peaks), the absolute value of the vibration change rate decreases, and the final absolute value of the vibration change rate is less than or equal to 0.5μm / min.

[0067] Based on the vibration data from the second test, the rate of change of vibration change rate and the peak vibration value are obtained within the first set time period after each change of excitation current. If the absolute value of the rate of change is greater than the preset ratio of the rate of change, and the number of peak vibration values ​​does not exceed the preset number, it means that if the rate of change of vibration changes within the first set time period after each change of excitation current, for example, within 20 minutes (the average vibration value collected per minute is used to calculate the rate of change of vibration, and the rate of change of the rate of change is calculated relative to the rate of change of the last minute before the change of excitation current, the same below), the absolute value of the rate of change of vibration change rate is greater than the preset ratio of the rate of change, for example, 50%, and the number of peak vibration values ​​(i.e., wave peaks) does not exceed the preset number, for example, 1, during the entire test process.

[0068] From the initial increase in hydrogen temperature to the end of the test, if the vibration amplitude and peak value both show a decreasing trend, or if the number of peaks and the vibration change rate meet the impact and wear requirements, it means that from the initial increase in hydrogen temperature to the end of the test, the vibration amplitude and peak value both show a decreasing trend, or the number of peaks does not exceed 2, and after the last peak (if there are peaks), the absolute value of the vibration change rate decreases, and the final absolute value of the vibration change rate is less than or equal to 0.5 μm / min.

[0069] If the preset change rate is, for example, 50%, and the second set time period is, for example, 10 minutes, then the change rate of vibration change rate within the second set time period after each change in vacuum pressure refers to the change rate of vibration change rate if the trend of vibration development is significantly changed within 10 minutes after each vacuum disturbance. The absolute value of the change rate is greater than the preset change rate, that is, the absolute value of the change rate of vibration change rate is greater than 50%.

[0070] In the embodiments of this disclosure, the specific process of determining whether the turbine generator set has experienced sealing tile rubbing using sealing oil temperature, excitation current, hydrogen temperature, and vacuum tests in steps S13 and S14 is as follows:

[0071] 1) First, conduct a variable sealing oil temperature test. The specific process is as follows:

[0072] 11) While keeping parameters such as active load, excitation current, vacuum pressure, and hydrogen temperature constant, perform a variable sealing oil temperature test on the generator.

[0073] 12) Control the sealing oil temperature to maintain it at the lower limit T value required by the unit operating procedures. omin After waiting for 2 hours, starting 2 minutes before the sealing oil temperature change, the vibration data of the target measuring point X1 was recorded every 1 second in real time, focusing on the power frequency component. The vibration data obtained throughout the test was defined as the vibration matrix D(i,j), where j = 1, 2, ..., 7200. i is related to the number of times the test variable was controlled; in this test, i = 1, 2, 3, 4. The power frequency component of the vibration data 2 minutes before the sealing oil temperature change was stored in the first row of the vibration matrix, D(1,j), where j = 7081, 7082, ..., 7200. Then, D(1,j) = 0, where j = 1, 2, ..., 7080. The sealing oil temperature was then changed to the lower limit value T. omin The power frequency component of the vibration data from the last two hours is stored in the second row D(2,j) of the vibration matrix, where j = 1, 2...7200;

[0074] 13) Control the sealing oil temperature to rise by 3°C and wait for 2 hours. During the waiting period, record the power frequency component of the vibration data of the target measuring point X1 every 1 second and store it in the third row D(3,j) of the vibration matrix, where j = 1, 2...7200. Then control the sealing oil temperature to rise to the upper limit value T required by the unit operation procedure.omax Wait for 2 hours. During the waiting period, record the power frequency component of the vibration data of the target measuring point X1 every 1 second in real time and store it in the fourth row D(4,j) of the vibration matrix, where j=1,2……7200;

[0075] 14) Define the amplitude matrix E(p,q) as the average vibration value at the q-th minute after the (p-1)-th adjustment of the sealing oil temperature, where p = 1 represents the average vibration value before the adjustment of the sealing oil temperature:

[0076]

[0077] Define the vibration rate matrix C(i,jo) to represent the vibration rate at minute jo after the (i-1)th adjustment of the sealing oil temperature:

[0078]

[0079] 15) For the (i-1)th adjustment of the sealing oil temperature, the time point when the vibration rate of change is 0 or the sign of the vibration rate of change changes is recorded as t. bj1 The average vibration value at this time point is E(i-1, t). bj1 The peak value or trough value (the change rate of vibration from positive to negative is the peak value, and vice versa) can be represented as H1(m), m = 1, 2, 3... The difference between adjacent peaks and troughs during the vibration fluctuation process can be recorded as ΔH1(n), ΔH1(n) = H1(n+1) - H1(n), n = 1, 2, 3... From the first increase of the sealing oil temperature to the end of the test, |ΔH1(n)| is decreasing (i.e. the vibration fluctuation amplitude is decreasing), and the peak value is also decreasing, or the number of peaks does not exceed 2. After the last peak (if there is a peak), the absolute value of the vibration change rate is decreasing, and the final absolute value of the vibration change rate is less than or equal to 0.5 μm / min, i.e. |C(4,120)|≤0.5. Then the vibration abnormality is considered to be related to the sealing oil temperature, which means that the vibration abnormality is caused by the rubbing failure of the sealing tile. Otherwise, a variable excitation current test is performed.

[0080] 2) Conduct a variable excitation current test, the specific process of which is as follows:

[0081] 21) Keep parameters such as active load, hydrogen temperature, vacuum, and sealing oil temperature constant, and conduct a variable excitation current test on the generator;

[0082] 22) First, clear all matrix data from the above variable seal oil temperature test, obtain the rated value I0 of the unit's excitation current, set the initial value of the unit's excitation current to I = 0.25 × I0, and set the first control excitation current to the initial value of the excitation current. Wait for 2 hours, and starting 2 minutes before controlling and adjusting the excitation current, record the power frequency component of the vibration data of the target measuring point X1 every 1 second in real time. Store the test vibration data obtained throughout the test process in the vibration matrix D(i,j). In this experiment, i = 1, 2, 3, 4, 5, and the vibration matrix is ​​D. 5×7200 The power frequency component of the vibration data 2 minutes before the excitation current change is stored in the first row D(1,j) of the vibration matrix, where j = 7081, 7082...7200. Let D(1,j) = 0, where j = 1, 2...7080. The power frequency component of the vibration data 2 hours after the first adjustment of the excitation current change is stored in the second row D(2,j) of the vibration matrix, where j = 1, 2...7200.

[0083] 23) Then increase the excitation current by ΔI = 0.25 × I0 and wait for 2 hours. During the waiting period, record the power frequency component of the vibration data of the target measuring point X1 every 1 second and store it in the third row D(3,j) of the vibration matrix, where j = 1, 2...7200. Subsequently, gradually increase the excitation current to the rated value I0 and wait for 2 hours. During the waiting period, record the power frequency component of the vibration data of the target measuring point X1 every 1 second and store it in the fifth row D(5,j) of the vibration matrix, where j = 1, 2...7200. The fourth row D(4,j) of the vibration matrix stores the power frequency component of the vibration data of the target measuring point X1 when the excitation current is 0.75I0.

[0084] 24) In this experiment, the amplitude matrix E(p,q) is the average vibration value at minute q after the (p-1)th adjustment of the excitation current, where p = 1 represents the average vibration value before the adjustment of the excitation current:

[0085]

[0086] In this experiment, the vibration rate matrix C(i,jo) represents the vibration rate at minute jo after the (i-1)th excitation current adjustment:

[0087]

[0088] 25) If for i = 2, 3, 4, 5, within 20 minutes after the (i-1)th excitation current change, there exists a time point k where the rate of change of vibration satisfies |C(i,k)-C(i-1,120)| / |C(i-1,120)|≥50%, (k≤20), and the vibration peak value does not exceed 1 throughout the entire test process, then the vibration is considered to be related to the excitation current, and the sealing tile rubbing fault is ruled out; otherwise, the vibration is considered to be unrelated to the excitation current, and the test proceeds to the variable hydrogen temperature test.

[0089] 3) Conduct a hydrogen temperature variation test, the specific process of which is as follows:

[0090] 31) Ensure that parameters such as active load, excitation current, vacuum pressure, and sealing oil temperature remain constant, and perform a hydrogen temperature variation test on the generator;

[0091] 32) All matrix data in the above test were reset to zero, and the hydrogen temperature was controlled to be maintained at the lower limit value T required by the unit operation procedure. Hmin After waiting for 2 hours, starting 2 minutes before the hydrogen temperature change, the vibration data of the target measuring point X1 was recorded every 1 second in real time, including the power frequency component. The experimental vibration data acquired throughout the experiment was stored in the vibration matrix D(i,j). In this experiment, i = 1, 2, 3, 4, and the vibration matrix is ​​D. 4×7200 The power frequency components of the vibration data for the first 2 minutes before the hydrogen temperature change are stored in the first row D(1,j) of the vibration matrix, where j = 7081, 7082, ..., 7200. Then, D(1,j) = 0, where j = 1, 2, ..., 7080. The hydrogen temperature is then changed to the lower limit T. Hmin The power frequency component of the vibration data from the last two hours is stored in the second row D(2,j) of the vibration matrix, where j = 1, 2...7200;

[0092] 33) Control the hydrogen temperature to increase by 3°C, wait for 2 hours, and record the power frequency component of the vibration data of the target measuring point X1 every 1 second during the waiting period, and store it in the third row D(3,j) of the vibration matrix, where j = 1, 2...7200. Then raise the hydrogen temperature to the upper limit value T required by the unit operation procedure. omax Wait for 2 hours. During the waiting period, record the power frequency component of the vibration data of the target measuring point X1 every 1 second in real time and store it in the fourth row D(4,j) of the vibration matrix, where j=1,2……7200;

[0093] 34) In this experiment, the amplitude matrix E(p,q) is the average vibration value at the qth minute after the (p-1)th adjustment of the hydrogen temperature, where p = 1 represents the average vibration value before the hydrogen temperature adjustment:

[0094]

[0095] In this experiment, the vibration rate matrix C(i,jo) represents the vibration rate at minute j after the (i-1)th hydrogen temperature adjustment:

[0096]

[0097] 35) For the (i-1)th hydrogen temperature adjustment, the time point at which the vibration rate changes to 0 or the sign of the rate of change changes is denoted as t. bj2 The average vibration value at this time point is E(i-1, t). bj2 The peak value or trough value is represented as H2(m), where m = 1, 2, 3…. During the vibration fluctuation process, the difference between adjacent peaks and troughs is recorded as ΔH2(n), where ΔH2(n) = H2(n+1) - H2(n), where n = 1, 2, 3…. From the first increase in hydrogen temperature to the end of the test, if |ΔH2(n)| is decreasing (i.e., the vibration fluctuation amplitude is decreasing), and the peak value is also decreasing, or if there are no more than 2 vibration peaks, and the absolute value of the vibration change rate is decreasing after the last peak (if there is a peak), and the final absolute value of the change rate is less than or equal to 0.5 μm / min, i.e., |C(4,120)| ≤ 0.5, then the vibration abnormality is considered to be caused by the rubbing failure of the sealing tile, and a vacuum test is conducted. Otherwise, there is no rubbing.

[0098] 4) Conduct a variable vacuum test, the specific process of which is as follows:

[0099] 41) Ensure that parameters such as active load, excitation current, sealing oil temperature, and hydrogen temperature remain constant, and perform a vacuum test on the generator.

[0100] 42) First, clear all matrix data in the experiment, stabilize the vacuum pressure at a certain value and wait for 2 hours. Then, quickly adjust the vacuum pressure so that the change range exceeds 3 kPa and stabilize for 2 hours. Each vacuum disturbance will affect the radial position of the rotor in the stator, thereby changing the dynamic-static clearance. Starting 2 minutes before the vacuum pressure change, record the power frequency component of the vibration data of the target measuring point X1 every 1 second in real time. Store the experimental vibration data obtained throughout the experiment in the vibration matrix D(i,j). In this experiment, i = 1, 2, 3, 4, and the vibration matrix is ​​D. 4×7200 The power frequency component of the vibration data 2 minutes before the change of vacuum pressure is stored in the first row D(1,j) of the vibration matrix, where j = 7081, 7082...7200. Let D(1,j) = 0, where j = 1, 2...7080. The power frequency component of the vibration data 2 hours after the first vacuum disturbance is stored in the second row D(2,j) of the vibration matrix, where j = 1, 2...7200.

[0101] 43) The vacuum is rapidly disturbed for the second time, causing its change amplitude to exceed 3 kPa, and then waited for 2 hours. During the waiting period, the power frequency component of the vibration data of the target measuring point X1 is recorded every 1 second and stored in the third row D(3,j) of the vibration matrix, where j = 1, 2...7200. The vacuum is rapidly disturbed for the third time, causing its change amplitude to exceed 3 kPa, and then waited for 2 hours. During the waiting period, the power frequency component of the vibration data of the target measuring point X1 is recorded every 1 second and stored in the fourth row D(4,j) of the vibration matrix, where j = 1, 2...7200.

[0102] 44) In this experiment, the amplitude matrix E(p,q) is the average vibration value at the q-th minute after the (p-1)-th vacuum adjustment, where p = 1 represents the average vibration value before vacuum adjustment:

[0103]

[0104] In this experiment, the vibration rate matrix C(i,jo) represents the vibration rate at minute jo after the (i-1)th vacuum adjustment:

[0105]

[0106] 45) If, within 10 minutes after each vacuum disturbance adjustment, there exists a time point k where the rate of change of vibration satisfies |C(i,k)-C(i-1,120)| / |C(i-1,120)|≥50%, (i=2,3,4,5; k≤10), then the abnormal vibration is considered to be caused by a rubbing failure of the sealing tile; otherwise, the rubbing failure of the sealing tile is excluded.

[0107] In this disclosure, taking the vibration problem of a 350MW steam turbine generator set in a power plant as an example, the entire process of identifying the sealing tile rubbing fault of this disclosure is described in detail, thereby verifying the effectiveness and practicality of the method of this disclosure.

[0108] Figure 2 This invention discloses a vibration trend diagram during unit operation provided in an embodiment of the present invention. Figure 3 This invention discloses a trend graph showing the relevant parameters during the variable sealing oil temperature test provided in the embodiments of this invention. Figure 4 This invention discloses a trend graph of relevant parameters during a variable excitation current test according to an embodiment of the present invention. Figure 5 This invention discloses a trend graph of relevant parameters during a variable hydrogen temperature test provided in an embodiment of the present invention. Figure 6 This invention discloses a trend graph of relevant parameters during a variable vacuum test provided in an embodiment of the present invention. Figure 7 This diagram illustrates the arrangement of measuring points provided in an embodiment of the present disclosure. Figure 8 The image shows a field-taken picture of the wear of the sealing tile, as provided in an embodiment of this disclosure.

[0109] A 350MW steam turbine generator set manufactured by a certain company was selected. On May 20th, the generator set was shut down for a Class C overhaul. Before the overhaul, the vibration at measuring point 7X was around 50μm (7W and 8W correspond to the front and rear bearings of the generator, respectively). During the overhaul, the bearings, including the sealing tiles, were inspected by flipping them over. After the Class C overhaul, the unit was started up, and the vibration of the generator's bearing No. 7 increased compared to before the overhaul, with the vibration at measuring point 7X around 90μm. During a temporary shutdown in September, Unit 1 mainly addressed a hydrogen leakage problem at the generator junction box. In addition, it was found that the oil quality in the lubricating oil header return line was substandard. After cleaning the filter and rechecking the oil quality, the unit was started up on September 7th. After running for several days, on September 12th, the vibration of bearing No. 7 began to fluctuate significantly, with the maximum increase at measuring point 7X reaching 185μm and measuring point 7Y reaching 130μm, seriously affecting the safe operation of the unit.

[0110] based on Figure 2 The trend chart shows that the vibrations at both measuring points 7X and 7Y fluctuated significantly, with measuring point 7X exhibiting the largest amplitude of vibration fluctuation. X10 The vibration value at measuring point 7X at time t was 146 μm. X11 The vibration value at measurement point 7X was 98 μm, and the time taken was t. X11 -t X10 =14min>2min, adjacent measuring point 7Y fluctuated from 110μm to 73μm, fluctuation amplitude 33.6%>20%, indicating that the turbine generator set may have rubbing; spectrum analysis of shaft vibration data was performed, t X10 The vibration frequency component at measurement point 7X is 135μm, t X11 The vibration frequency component at measurement point 7X is 90μm. During the vibration change, the proportion of the frequency component is |135-90| / 135=93.8%≥70%. It is believed that the dominant frequency of the vibration change is the frequency component. It is further believed that the turbine generator set may have rubbing. Then, a variable sealing oil temperature test is carried out.

[0111] To ensure constant parameters such as active load, excitation current, vacuum, and hydrogen temperature, a variable sealing oil temperature test was performed on the generator. The sealing oil temperature was sequentially set to 40, 43, and 46 degrees Celsius, with a 2-hour waiting period for each temperature. Vibration changes were observed, and the real-time vibration data (power frequency component) was stored in the vibration matrix D. 4×7200 The amplitude matrix E and the vibration rate C are calculated. The time points when the vibration rate is 0 or when the sign of the rate of change changes are recorded are denoted as t. bj1 The vibration value corresponds to E(i-1, t) bj1 The peak or trough value is denoted as H1(m), where m = 1, 2, 3… The trends of relevant parameters during the experiment are shown in… Figure 3 We obtain H1(1).

[0112] =127, H1(2)=161, H1(3)=113, H1(4)=134, H1(5)=117, H1(6)=185, H1(7)= 125, H1(8)=172, |ΔH1(1)|=34, |ΔH1(2)|=48, |ΔH1(3)|=21, |ΔH1(4)|=17,

[0113] |ΔH1(5)|=68, |ΔH1(6)|=60, |ΔH1(7)|=47. It can be seen that after the sealing oil temperature increases, the change of |ΔH1(n)| does not show a decreasing state, so a variable excitation current test is carried out.

[0114] With active load, sealing oil temperature, hydrogen temperature, and vacuum parameters kept constant, a variable excitation current test was conducted on the generator. The excitation current was sequentially set to 625A, 1250A, 1875A, and 2500A, with each setting observed for 2 hours to monitor vibration changes. The real-time vibration data (power frequency component) during the test was stored in the vibration matrix D. 5×7200 The amplitude matrix E and vibration rate of change C were calculated. Trends of relevant parameters during the experiment are shown in [reference needed]. Figure 4 It can be seen that for i=3, that is, within 20 minutes after the second excitation current change, there is no vibration change rate at any time point k that satisfies |C(2,k)-C(1,120)| / |C(1,120)|≥50%, and there are multiple vibration peaks in the whole test process, more than one. Therefore, it is considered that the vibration is unrelated to the excitation current, and a variable hydrogen temperature test is carried out.

[0115] Maintaining constant active load, sealing oil temperature, excitation current, and vacuum parameters, a variable hydrogen temperature test was conducted on the generator. The hydrogen temperature was sequentially set to 42, 45, and 48 degrees Celsius, with each temperature observed for 2 hours after each setting. Vibration changes were then recorded, and the real-time vibration data (power frequency component) was stored in the vibration matrix D. 4×7200 The amplitude matrix E and the vibration rate C are calculated. The time points when the vibration rate is 0 or when the sign of the rate of change changes are recorded are denoted as t. bj2 The vibration value corresponds to E(i-1, t) bj2 The peak or trough value is denoted as H2(m), where m = 1, 2, 3… The trends of relevant parameters during the experiment are shown in… Figure 5 We can obtain H2(1)

[0116] =186, H2(2)=100, H2(3)=167, H2(4)=105, H2(5)=147, H2(6)=108, H2(7)

[0117] =142, corresponding to |ΔH2(1)|=86, |ΔH2(2)|=67, |ΔH2(3)|=62, |ΔH2(4)|=42, |ΔH2(5)|=39, |ΔH2(6)|=34. |ΔH2(n)| is decreasing, and the peak value is also decreasing. It is believed that the abnormal vibration may be caused by the rubbing failure of the sealing tile, and a variable vacuum test is carried out.

[0118] Maintaining constant active load, sealing oil temperature, excitation current, and hydrogen temperature, a vacuum test was conducted on the generator. The vacuum was rapidly disturbed three times, with the change exceeding 3 kPa. Vibration trends were observed after 2 hours of observation following each disturbance. The real-time vibration data (power frequency component) from the test was stored in the vibration matrix D. 4×7200 The amplitude matrix E and vibration rate of change C were calculated. Trends of relevant parameters during the experiment are shown in [reference needed]. Figure 6 We can obtain the following results for the first vacuum adjustment: C(1,120) = -1, C(2,8) = 2, |-1-2| / |-1| = 3 > 50%; for the second vacuum adjustment: C(2,120) = -0.5, C(3,5) = 1, |-0.5-1| / |-0.5| = 3 > 50%; for the third vacuum adjustment: C(3,120) = -1.8, C(4,7) = 0.5, |-1.8-0.5| / |-1.8| = 1.278 > 50%. Therefore, we believe that the abnormal vibration is caused by a rubbing failure of the sealing tile.

[0119] Based on the above diagnostic conclusions, the power plant formulated a maintenance plan. During a shutdown inspection, it was found that the sealing tiles on both sides of the generator were severely deformed, with obvious wear marks, concentrated on the furnace side at a 45-degree angle downwards. The radial clearance measurement data are shown in Table 1, and the corresponding measuring point layout is shown in [Table 1]. Figure 7 .like Figure 7 As shown, eight measuring points are arranged on the electric side and the furnace side.

[0120] Table 1 Radial clearance (mm)

[0121] airside 0.10 0.17 0.28 0.21 hydrogen side 0.20 0.14 0.20 0.19

[0122] In Table 1, the horizontal clearance on the hollow side is only 0.1 mm, which deviates significantly from the standard value (0.2–0.25 mm). The ellipticity is severely exceeded. Based on the measurement data, it can be inferred that the sealing tile maintains an upright elliptical posture during operation. This working state is highly susceptible to dynamic and static friction failure. Furthermore, based on… Figure 8 The photos of the weathering tile taken on-site also show obvious wear marks on the surface of the weathering tile, proving that the diagnosis was correct.

[0123] In the method for identifying sealing tile rubbing based on the vibration change rate associated with variable parameter tests in this embodiment, the relative shaft vibration data at the generator bearing is acquired during the operation of the turbine generator set. Based on the relative shaft vibration data, it is determined whether the relative shaft vibration of the turbine generator set meets the basic characteristics of sealing tile rubbing. If it does, the sealing oil temperature, excitation current, hydrogen temperature, and vacuum pressure are controlled and adjusted according to corresponding preset control rules to conduct variable sealing oil temperature tests, variable excitation current tests, variable hydrogen temperature tests, and variable vacuum tests, and the corresponding test vibration data is acquired. Based on the corresponding test vibration data, it is determined whether the turbine generator set has experienced sealing tile rubbing. In this case, when the relative shaft vibration meets the basic characteristics of sealing tile rubbing, the relevant operating parameters (i.e., excitation current, sealing oil temperature, hydrogen temperature, and vacuum pressure) are adjusted for testing, and the vibration data of the turbine generator set during the test is collected. The corresponding test vibration data is then used to determine whether a sealing tile rubbing fault has occurred. Therefore, it is possible to identify whether the turbine rotor has experienced a sealing tile rubbing fault in a timely and accurate manner.

[0124] This disclosed method measures the relative shaft vibration at the support bearings at both ends of the generator. It then determines whether the vibration phenomenon conforms to the basic characteristics of a sealing tile rubbing fault. To differentiate the sealing tile rubbing fault from other generator rotor thermal bending faults caused by other factors, on-site fault diagnosis involves progressively analyzing and investigating tests such as sealing oil temperature, excitation current, and hydrogen temperature. Combined with a vacuum experiment, the radial position of the rotor within the stator is changed by vacuum disturbance to obtain data on vibration changes under vacuum disturbance. In this case, relevant operating parameters (such as excitation current, sealing oil temperature, hydrogen temperature, and vacuum) are adjusted to analyze experimental characteristics, and vibration data of the turbine generator set during the test are collected to identify whether a sealing tile rubbing fault has occurred. This provides a scientific basis for operators to take relevant operational measures to improve vibration and provides guidance for maintenance personnel to develop maintenance plans in advance. The method exhibits high accuracy and real-time performance. Meanwhile, the method disclosed herein can directly use the data from the DCS system and TDM system randomly equipped on the steam turbine generator set, eliminating the need for external instruments and equipment. The operating conditions are simple, it is easy to implement on site, and the analysis results are reliable. It has been used many times in on-site fault analysis to accurately diagnose the sealing tile rubbing fault of the steam turbine generator set, ensuring equipment safety and creating huge economic and social benefits for the power plant.

[0125] The following are system embodiments of this disclosure, which can be used to execute the method embodiments of this disclosure. For details not disclosed in the system embodiments of this disclosure, please refer to the method embodiments of this disclosure.

[0126] Please see Figure 9 , Figure 9This diagram illustrates a system for identifying sealing tile rubbing based on the rate of vibration change associated with variable parameter tests, as provided in an embodiment of this disclosure. This system can be implemented as all or part of a system through software, hardware, or a combination of both. The system 10 includes an acquisition module 11, a first judgment module 12, a control module 13, and a second judgment module 14, wherein:

[0127] Module 11 is used to acquire relative shaft vibration data at the generator bearing during the operation of the steam turbine generator set;

[0128] The first judgment module 12 is used to judge whether the relative shaft vibration of the turbine generator set meets the basic characteristics of sealing tile rubbing based on the relative shaft vibration data.

[0129] The control module 13 is used to control and adjust the sealing oil temperature, excitation current, hydrogen temperature, and vacuum pressure according to the corresponding preset control rules, if the conditions are met, so as to carry out variable sealing oil temperature test, variable excitation current test, variable hydrogen temperature test, and variable vacuum test, and obtain the corresponding test vibration data.

[0130] The second judgment module 14 is used to determine whether the turbine generator set has experienced sealing tile rubbing based on the corresponding test vibration data.

[0131] Optionally, the first judgment module 11 is specifically used to: perform trend analysis on the relative shaft vibration data to determine the target measuring point with the largest vibration change amplitude; if the target measuring point experiences slow fluctuation and the vibration of at least one adjacent measuring point of the target measuring point changes synchronously, then perform spectrum analysis on the relative shaft vibration data to determine whether the dominant frequency during the generator relative shaft vibration change is a power frequency component, and if so, then the basic characteristics of sealing tile rubbing are satisfied.

[0132] Optionally, the control module 13 is configured to: control the active load, excitation current, vacuum pressure, and hydrogen temperature to remain constant, and conduct a variable sealing oil temperature test on the generator; during the test, control and adjust the sealing oil temperature once every first preset time interval, and sequentially control the sealing oil temperature to the lower limit, the middle value, and the upper limit value; and acquire the first test vibration data during the entire variable sealing oil temperature test.

[0133] Optionally, the control module 13 is configured to: control the active load, sealing oil temperature, vacuum pressure, and hydrogen temperature to remain constant, and conduct a variable excitation current test on the generator; during the test, control and adjust the excitation current once every second preset time interval, and increase the excitation current according to the current step size each time until the excitation current is controlled at the rated value of the excitation current, the current step size being obtained based on a preset proportion of the rated value of the excitation current; and acquire second test vibration data during the entire variable excitation current test.

[0134] Optionally, the control module 13 is configured to: control the active load, excitation current, vacuum pressure, and sealing oil temperature to remain constant, and conduct a variable hydrogen temperature test on the generator; during the test, control and adjust the hydrogen temperature once every third preset time interval, and sequentially control the hydrogen temperature to the lower limit, the middle value, and the upper limit value; and acquire the third test vibration data during the entire variable hydrogen temperature test.

[0135] Optionally, the control module 13 is used to: control the active load, excitation current, sealing oil temperature, and hydrogen temperature to remain constant, and perform a variable vacuum test on the generator; during the test, the vacuum is disturbed once every fourth preset time interval, so that the change in vacuum pressure each time exceeds the preset pressure difference; and to acquire the fourth test vibration data during the entire variable vacuum test period.

[0136] Optionally, the second judgment module 14 is specifically used to: based on the first test vibration data, obtain the vibration fluctuation amplitude, peak value, number of peaks, and vibration change rate during the entire variable sealing oil temperature test; from the initial increase of the sealing oil temperature to the end of the test, if the vibration fluctuation amplitude and peak value both show a decreasing trend, or the number of peaks and vibration change rate meet the rubbing requirements, then the turbine generator set experiences sealing tile rubbing; otherwise, based on the second test vibration data, obtain the change rate of vibration change rate and vibration peak value within a first set time period after each change of excitation current; if the absolute value of the change rate is greater than the preset change rate ratio, and the vibration... If the number of peak vibrations does not exceed the preset number, then the turbine generator set has not experienced sealing tile rubbing. Otherwise, based on the vibration data from the third test, the vibration fluctuation amplitude, peak value, number of peaks, and vibration change rate are obtained throughout the entire variable hydrogen temperature test. From the initial increase in hydrogen temperature to the end of the test, if the vibration fluctuation amplitude and peak value both show a decreasing trend, or if the number of peaks and vibration change rate meet the rubbing requirements, then based on the vibration data from the fourth test, the change rate of the vibration change rate within the second set time period after each change in vacuum pressure is obtained. If the absolute value of the change rate is greater than the preset change rate ratio, then the turbine generator set has experienced sealing tile rubbing.

[0137] It should be noted that the system for identifying sealing tile rubbing based on the rate of vibration change associated with variable parameter tests, as described in the above embodiments, is only illustrated by the division of the functional modules mentioned above. In practical applications, the functions can be assigned to different functional modules as needed, that is, the internal structure of the device for identifying sealing tile rubbing based on the rate of vibration change associated with variable parameter tests can be divided into different functional modules to complete all or part of the functions described above. Furthermore, the system for identifying sealing tile rubbing based on the rate of vibration change associated with variable parameter tests and the method for identifying sealing tile rubbing based on the rate of vibration change associated with variable parameter tests provided in the above embodiments belong to the same concept, and the implementation process is detailed in the method embodiments, which will not be repeated here.

[0138] The sequence numbers of the embodiments disclosed above are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0139] In this embodiment of the system for identifying sealing tile rubbing based on the vibration change rate associated with variable parameter tests, the acquisition module is used to acquire relative shaft vibration data at the generator bearing during the operation of the turbine generator set; the first judgment module is used to determine whether the relative shaft vibration of the turbine generator set meets the basic characteristics of sealing tile rubbing based on the relative shaft vibration data; the control module is used to control and adjust the sealing oil temperature, excitation current, hydrogen temperature, and vacuum pressure according to the corresponding preset control rules, respectively, using sealing oil temperature, excitation current, hydrogen temperature, and vacuum pressure as variables, to conduct variable sealing oil temperature test, variable excitation current test, variable hydrogen temperature test, and variable vacuum test, and acquire the corresponding test vibration data; the second judgment module is used to determine whether the turbine generator set has experienced sealing tile rubbing based on the corresponding test vibration data. In this case, when the relative shaft vibration meets the basic characteristics of sealing tile rubbing, the relevant operating parameters (i.e., excitation current, sealing oil temperature, hydrogen temperature, and vacuum pressure) are adjusted to conduct tests, and the vibration data of the turbine generator set during the test is collected. The corresponding test vibration data is then used to determine whether a sealing tile rubbing fault has occurred, thereby enabling timely and accurate identification of whether the turbine rotor has experienced a sealing tile rubbing fault.

[0140] According to embodiments of this disclosure, this disclosure also provides a device for identifying sealing tile rubbing based on the rate of vibration change associated with variable parameter tests, a readable storage medium, and a computer program product.

[0141] Figure 10This is a block diagram of an apparatus for identifying sealing tile rubbing based on the variable parameter test-correlated vibration change rate method according to embodiments of the present disclosure. The apparatus for identifying sealing tile rubbing based on the variable parameter test-correlated vibration change rate is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The apparatus for identifying sealing tile rubbing based on the variable parameter test-correlated vibration change rate can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable electronic devices, and other similar computing devices. The components, connections and relationships between components, and functions shown in this disclosure are merely examples and are not intended to limit the implementation of the present disclosure as described and / or claimed herein.

[0142] like Figure 10 As shown, the device 20 for identifying sealing tile rubbing based on the rate of vibration change associated with variable parameter tests includes a computing unit 21, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 22 or a computer program loaded from a storage unit 28 into a random access memory (RAM) 23. The RAM 23 may also store various programs and data required for the operation of the device 20 for identifying sealing tile rubbing based on the rate of vibration change associated with variable parameter tests. The computing unit 21, ROM 22, and RAM 23 are interconnected via a bus 24. An input / output (I / O) interface 25 is also connected to the bus 24.

[0143] The device 20 for identifying sealing tile rubbing based on the rate of vibration change associated with variable parameter testing, has multiple components connected to an I / O interface 25, including: an input unit 26, such as a keyboard or mouse; an output unit 27, such as various types of displays or speakers; a storage unit 28, such as a disk or optical disk, which is communicatively connected to a computing unit 21; and a communication unit 29, such as a network card, modem, or wireless transceiver. The communication unit 29 allows the device 20 to exchange information / data with other devices for identifying sealing tile rubbing based on the rate of vibration change associated with variable parameter testing through computer networks such as the Internet and / or various telecommunication networks.

[0144] The computing unit 21 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the computing unit 21 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The computing unit 21 performs the various methods and processes described above, such as performing a method for identifying sealing tile rubbing based on the rate of change of vibration associated with variable parameter tests. For example, in some embodiments, the method for identifying sealing tile rubbing based on the rate of change of vibration associated with variable parameter tests can be implemented as a computer software program tangibly contained in a machine-readable medium, such as storage unit 28. In some embodiments, part or all of the computer program can be loaded and / or installed on the device 20 for identifying sealing tile rubbing based on the rate of change of vibration associated with variable parameter tests via ROM 22 and / or communication unit 29. When the computer program is loaded into RAM 23 and executed by the computing unit 21, one or more steps of the method for identifying sealing tile rubbing based on the rate of change of vibration associated with variable parameter tests described above can be performed. Alternatively, in other embodiments, the computing unit 21 may be configured by any other suitable means (e.g., by means of firmware) to perform a method for identifying seal tile rubbing based on the rate of change of vibration associated with variable parameter tests.

[0145] Various embodiments of the systems and techniques described above in this disclosure can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic electronic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include: implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0146] The program code used to implement the methods of this disclosure may be written in any combination of one or more programming languages. This program code may be provided to a processor or controller of a general-purpose computer, special-purpose computer, or other programmable data processing apparatus, such that when executed by the processor or controller, the program code causes the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may be executed entirely on a machine, partially on a machine, as a standalone software package partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0147] In this disclosure, a machine-readable medium can be a tangible medium that may contain or store a program for use by an instruction execution system, apparatus, or device for identifying sealing tile rubbing based on the rate of change of vibration associated with a variable parameter test, or for use in conjunction with an instruction execution system, apparatus, or device for identifying sealing tile rubbing based on the rate of change of vibration associated with a variable parameter test. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can be, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or electronic devices, or any suitable combination of the foregoing. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage electronics, magnetic storage electronics, or any suitable combination of the foregoing.

[0148] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device for displaying information to the user (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor); and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the computer. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0149] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or middleware components (e.g., application servers), or frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), the Internet, and blockchain networks.

[0150] Computer systems can include clients and servers. Clients and servers are generally geographically separated and typically interact via communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. A server can be a cloud server, also known as a cloud computing server or cloud host, a hosting product within the cloud computing service ecosystem, addressing the shortcomings of traditional physical hosts and VPS (Virtual Private Server, or simply "VPS") services, such as high management difficulty and weak business scalability. Servers can also be servers for distributed systems or servers incorporating blockchain technology.

[0151] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this disclosure can be achieved, and this disclosure does not impose any limitations herein.

[0152] The specific embodiments described above do not constitute a limitation on the scope of protection of this disclosure. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A method for identifying sealing tile rubbing based on the rate of vibration change correlated by variable parameter tests, characterized in that, include: Acquire relative shaft vibration data at the generator bearing during the operation of the steam turbine generator set; Based on the relative shaft vibration data, determine whether the relative shaft vibration of the steam turbine generator set meets the basic characteristics of sealing tile rubbing. If the conditions are met, the sealing oil temperature, excitation current, hydrogen temperature, and vacuum pressure are used as variables, respectively. The sealing oil temperature, excitation current, hydrogen temperature, and vacuum pressure are controlled and adjusted according to the corresponding preset control rules to conduct variable sealing oil temperature test, variable excitation current test, variable hydrogen temperature test, and variable vacuum test, and the corresponding test vibration data are obtained. Determine whether the turbine generator set has experienced sealing tile rubbing based on the corresponding test vibration data; The sealing oil temperature, excitation current, hydrogen temperature, and vacuum pressure are controlled and adjusted according to corresponding preset control rules to conduct variable sealing oil temperature tests, variable excitation current tests, variable hydrogen temperature tests, and variable vacuum tests, and to acquire corresponding test vibration data, including: While keeping the active load, excitation current, vacuum pressure, and hydrogen temperature constant, a variable sealing oil temperature test is conducted on the generator. During the test, the sealing oil temperature was controlled and adjusted once every first preset time interval, and the sealing oil temperature was controlled to be at the lower limit value, the middle value, and the upper limit value in sequence. Acquire the first test vibration data during the entire variable seal oil temperature test; With active load, sealing oil temperature, vacuum pressure, and hydrogen temperature kept constant, a variable excitation current test is conducted on the generator. During the experiment, the excitation current is controlled and adjusted once every second preset time interval. Each time the excitation current is adjusted, it is increased according to the current step size until the excitation current is controlled at the rated value of the excitation current. The current step size is obtained based on the preset ratio of the rated value of the excitation current. Acquire the second test vibration data during the entire variable excitation current test; By keeping the active load, excitation current, vacuum pressure, and sealing oil temperature constant, a variable hydrogen temperature test is conducted on the generator. During the experiment, the hydrogen temperature was controlled and adjusted every third preset time interval, and the hydrogen temperature was controlled to be at the lower limit, the middle value and the upper limit value in sequence. Acquire the third test vibration data during the entire variable hydrogen temperature test; While keeping the active load, excitation current, sealing oil temperature, and hydrogen temperature constant, perform a vacuum test on the generator. During the experiment, the vacuum was disturbed every fourth preset time interval, so that the change in vacuum pressure each time exceeded the preset pressure difference; Acquire the fourth test vibration data during the entire variable vacuum test period; The determination of whether the turbine generator set has experienced sealing tile rubbing based on the corresponding test vibration data includes: Based on the vibration data from the first test, the vibration fluctuation amplitude, peak value, number of peaks and vibration change rate during the entire variable sealing oil temperature test are obtained. From the first increase of the sealing oil temperature to the end of the test, if the vibration fluctuation amplitude and peak value both show a decreasing trend, or the number of peaks and vibration change rate meet the rubbing requirements, then the turbine generator set will experience sealing tile rubbing. Otherwise, based on the vibration data from the second test, the rate of change of vibration change rate and the peak vibration value within the first set time period after each change of excitation current are obtained. If the absolute value of the rate of change is greater than the preset ratio of the rate of change and the number of peak vibration values ​​does not exceed the preset number, then the turbine generator set has not experienced sealing tile rubbing. Otherwise, based on the third test vibration data, the vibration fluctuation amplitude, peak value, number of peaks, and vibration change rate during the entire variable hydrogen temperature test are obtained. From the first increase in hydrogen temperature to the end of the test, if the vibration fluctuation amplitude and peak value both show a decreasing trend, or if the number of peaks and vibration change rate meet the rubbing requirements, then based on the fourth test vibration data, the change rate of vibration change rate within the second set time period after each change in vacuum pressure is obtained. If the absolute value of the change rate is greater than the preset change rate ratio, the turbine generator set experiences sealing tile rubbing.

2. The method for identifying sealing tile rubbing based on the rate of vibration change correlated with variable parameter tests as described in claim 1, characterized in that, The determination of whether the relative shaft vibration of the turbine generator set meets the basic characteristics of sealing tile rubbing based on the relative shaft vibration data includes: Trend analysis is performed on the relative shaft vibration data to determine the target measuring point with the largest vibration change amplitude; If the target measuring point exhibits slow fluctuations and the vibration of at least one adjacent measuring point changes synchronously, then the relative shaft vibration data is subjected to spectral analysis to determine whether the dominant frequency during the generator relative shaft vibration change is a power frequency component. If so, the basic characteristics of sealing tile rubbing are satisfied.

3. A system for identifying sealing tile rubbing based on the rate of vibration change correlated by variable parameter tests, characterized in that, include: The acquisition module is used to acquire relative shaft vibration data at the generator bearing during the operation of the steam turbine generator set; The first judgment module is used to determine whether the relative shaft vibration of the turbine generator set meets the basic characteristics of sealing tile rubbing based on the relative shaft vibration data. The control module is used to control and adjust the sealing oil temperature, excitation current, hydrogen temperature, and vacuum pressure according to the corresponding preset control rules, if the conditions are met, so as to conduct variable sealing oil temperature test, variable excitation current test, variable hydrogen temperature test, and variable vacuum test, and obtain the corresponding test vibration data. The second judgment module is used to determine whether the turbine generator set has experienced sealing tile rubbing based on the corresponding test vibration data; The control module is also used to keep the active load, excitation current, vacuum pressure, and hydrogen temperature constant, and to conduct a variable sealing oil temperature test on the generator. During the test, the sealing oil temperature was controlled and adjusted once every first preset time interval, and the sealing oil temperature was controlled to be at the lower limit value, the middle value, and the upper limit value in sequence. Acquire the first test vibration data during the entire variable seal oil temperature test; With active load, sealing oil temperature, vacuum pressure, and hydrogen temperature kept constant, a variable excitation current test is conducted on the generator. During the experiment, the excitation current is controlled and adjusted once every second preset time interval. Each time the excitation current is adjusted, it is increased according to the current step size until the excitation current is controlled at the rated value of the excitation current. The current step size is obtained based on the preset ratio of the rated value of the excitation current. Acquire the second test vibration data during the entire variable excitation current test; By keeping the active load, excitation current, vacuum pressure, and sealing oil temperature constant, a variable hydrogen temperature test is conducted on the generator. During the experiment, the hydrogen temperature was controlled and adjusted every third preset time interval, and the hydrogen temperature was controlled to be at the lower limit, the middle value and the upper limit value in sequence. Acquire the third test vibration data during the entire variable hydrogen temperature test; While keeping the active load, excitation current, sealing oil temperature, and hydrogen temperature constant, perform a vacuum test on the generator. During the experiment, the vacuum was disturbed every fourth preset time interval, so that the change in vacuum pressure each time exceeded the preset pressure difference; Acquire the fourth test vibration data during the entire variable vacuum test period; The second judgment module is also used to obtain the vibration fluctuation amplitude, peak value, number of peaks and vibration change rate during the entire variable sealing oil temperature test based on the first test vibration data. If the vibration fluctuation amplitude and peak value both show a decreasing trend from the first increase of sealing oil temperature to the end of the test, or if the number of peaks and vibration change rate meet the rubbing requirements, then the turbine generator set will experience sealing tile rubbing. Otherwise, based on the vibration data from the second test, the rate of change of vibration change rate and the peak vibration value within the first set time period after each change of excitation current are obtained. If the absolute value of the rate of change is greater than the preset ratio of the rate of change and the number of peak vibration values ​​does not exceed the preset number, then the turbine generator set has not experienced sealing tile rubbing. Otherwise, based on the third test vibration data, the vibration fluctuation amplitude, peak value, number of peaks, and vibration change rate during the entire variable hydrogen temperature test are obtained. From the first increase in hydrogen temperature to the end of the test, if the vibration fluctuation amplitude and peak value both show a decreasing trend, or if the number of peaks and vibration change rate meet the rubbing requirements, then based on the fourth test vibration data, the change rate of vibration change rate within the second set time period after each change in vacuum pressure is obtained. If the absolute value of the change rate is greater than the preset change rate ratio, the turbine generator set experiences sealing tile rubbing.

4. The system for identifying sealing tile rubbing based on the rate of vibration change correlated with variable parameter tests as described in claim 3, characterized in that, The first judgment module is specifically used for: Trend analysis is performed on the relative shaft vibration data to determine the target measuring point with the largest vibration change amplitude; If the target measuring point exhibits slow fluctuations and the vibration of at least one adjacent measuring point changes synchronously, then the relative shaft vibration data is subjected to spectral analysis to determine whether the dominant frequency during the generator relative shaft vibration change is a power frequency component. If so, the basic characteristics of sealing tile rubbing are satisfied.

5. A device for identifying sealing tile rubbing based on the rate of vibration change correlated by variable parameter testing, characterized in that, include: At least one processor; And a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the method for identifying sealing tile rubbing based on the rate of change of vibration associated with variable parameter tests as described in any one of claims 1-2.

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