A method and device for diagnosing a steam turbine vacuum leakage

Abstract

The application relates to the technical field of thermal power generation, and discloses a steam turbine vacuum leakage diagnosis method and device, when it is judged that a vacuum pump is in an operating state, the working time length of the vacuum pump is acquired, when the working time length reaches a preset working time length, the vacuum degree of the steam turbine is acquired, a first judgment condition is responded according to the relationship between the vacuum degree of the steam turbine and a preset vacuum degree, when the first judgment condition is successfully responded, a first internal pressure value of the steam turbine is acquired, a second internal pressure value of the steam turbine is acquired within a preset time, a second judgment condition is responded according to the relationship between the first internal pressure value and the second internal pressure value, and whether the steam turbine is in a vacuum leakage state is judged according to the first judgment condition and the second judgment condition. The application can accurately judge whether the steam turbine is in a vacuum leakage state through the first judgment condition and the second judgment condition, avoids a traditional complex diagnosis mode, improves diagnosis accuracy, and improves the use reliability of the steam turbine.

Description

Technical Field

[0001] This invention relates to the field of thermal power generation technology, and in particular to a method and apparatus for diagnosing vacuum leaks in steam turbines. Background Technology

[0002] In thermal power plants, the condenser's role is to establish a vacuum at the turbine exhaust port, improving the turbine's work capacity and achieving the effects of reducing coal consumption, saving energy, and reducing emissions. Generally, the vacuum system in a thermal power plant mainly includes a condensate system and a vacuum pump system, primarily consisting of auxiliary equipment such as the condenser, vacuum pump, and ejector. Vacuum tightness is a key indicator for monitoring leakage in the unit's vacuum system. Due to equipment aging and poor maintenance, leaks can appear in the vacuum system, increasing leakage and leading to increased condenser subcooling and terminal temperature differences, higher vacuum pump current, and decreased unit efficiency. Power plants typically conduct regular vacuum tightness tests to assess leakage in the unit's vacuum area and determine the presence of leaks.

[0003] Traditional methods for leak detection in vacuum systems include condenser water injection, helium mass spectrometry, and ultrasonic testing. Condenser water injection is commonly used in power plants because it is simple, cost-effective, and requires minimal equipment and personnel expertise. However, this method requires the unit to be shut down for maintenance. When the unit is under cooling, the vacuum system components are highly susceptible to temperature variations. Therefore, in practice, this method may result in a passable condenser water injection test, but leaks may still exist in the vacuum system after the unit is put back into operation.

[0004] Therefore, how to provide a method and device for diagnosing leaks in steam turbine vacuum systems is a technical problem that needs to be solved. Summary of the Invention

[0005] This invention provides a method and apparatus for diagnosing vacuum leaks in steam turbines, which solves the technical problem in the prior art that it is impossible to accurately diagnose the vacuum leak status of steam turbines and thus cannot guarantee the reliability of steam turbine operation.

[0006] To achieve the above objectives, the present invention provides a method for diagnosing vacuum leaks in a steam turbine, the method comprising:

[0007] When it is determined that the vacuum pump is in operation, the working time of the vacuum pump is obtained, and when the working time reaches the preset working time, the vacuum degree of the steam turbine is obtained;

[0008] The first judgment condition is responded to based on the relationship between the vacuum degree of the steam turbine and the preset vacuum degree;

[0009] When the first judgment condition is successfully met, the first internal pressure value of the steam turbine is obtained, the second internal pressure value of the steam turbine is obtained within a preset time, and the second judgment condition is responded to according to the relationship between the first internal pressure value and the second internal pressure value.

[0010] Based on the first and second judgment conditions, determine whether the steam turbine is in a leaking state.

[0011] In one embodiment, before obtaining the operating time of the vacuum pump when it is determined that the vacuum pump is in operation, the method further includes:

[0012] Obtain the current operating condition information of the steam turbine, which includes the steam pressure, steam temperature, and steam flow rate of the steam turbine.

[0013] Determine whether the current operating condition information is within the corresponding preset range.

[0014] If the current operating condition information is within the corresponding preset range, then the vacuum pump is controlled to perform vacuuming on the steam turbine.

[0015] In one embodiment, responding to a first judgment condition based on the relationship between the turbine's vacuum level and a preset vacuum level includes:

[0016] The relationship between the stated vacuum level and the preset vacuum level is used to determine whether the steam turbine may be in a leaking state.

[0017] When the vacuum level is less than the preset vacuum level, it is determined that the steam turbine may be in a leaking state, and the first judgment condition is successfully met.

[0018] When the vacuum level is greater than or equal to the preset vacuum level, it is determined that the turbine cannot be in a leaking state.

[0019] In one embodiment, responding to a second judgment condition based on the relationship between the first internal pressure value and the second internal pressure value includes:

[0020] Obtain the first time node corresponding to the first internal pressure value, and obtain the second time node corresponding to the second internal pressure value;

[0021] Calculate the total time consumed for the first internal pressure value to rise or fall to the second internal pressure value based on the first time node and the second time node;

[0022] The relationship between the total time and the time threshold is used to determine whether the steam turbine is in a leaking state.

[0023] If the total time is greater than the time threshold, then the turbine is determined to be in a leaking state.

[0024] If the total time is less than or equal to the time threshold, it is determined that the turbine is not in a leaking state.

[0025] In one embodiment, after determining that the steam turbine is in a leaking state, the method further includes:

[0026] The leakage level of the steam turbine is determined based on the vacuum level A of the steam turbine.

[0027] A preset vacuum threshold matrix M is defined as M(M1, M2, M3), where M1 is the first preset vacuum threshold, M2 is the second preset vacuum threshold, and M3 is the third preset vacuum threshold, and M1 < M2 < M3.

[0028] Different leakage levels are determined based on the relationship between the turbine's vacuum level A and various preset vacuum thresholds:

[0029] When A≤M1, a Level 1 leakage level is generated;

[0030] When M1 < A ≤ M2, a level 2 leakage level is generated;

[0031] When M2 < A ≤ M3, a three-level leakage level is generated;

[0032] When M3 < A, a fourth-level leakage level is generated.

[0033] To achieve the above objectives, the present invention also provides a steam turbine vacuum leak diagnostic device, the device comprising:

[0034] The acquisition module is used to acquire the working time of the vacuum pump when it is determined that the vacuum pump is in operation, and to acquire the vacuum degree of the steam turbine when the working time reaches a preset working time.

[0035] The first response module is used to respond to the first judgment condition based on the relationship between the vacuum degree of the steam turbine and the preset vacuum degree;

[0036] The second response module is used to obtain the first internal pressure value of the steam turbine when it successfully responds to the first judgment condition, obtain the second internal pressure value of the steam turbine within a preset time, and respond to the second judgment condition according to the relationship between the first internal pressure value and the second internal pressure value.

[0037] The judgment module is used to determine whether the steam turbine is in a leaking state based on the first judgment condition and the second judgment condition.

[0038] In one embodiment, before acquiring the operating time of the vacuum pump when it is determined that the vacuum pump is in operation, the acquisition module further includes:

[0039] The acquisition module is used to acquire the current operating condition information of the steam turbine, which includes the steam pressure, steam temperature, and steam flow rate of the steam turbine.

[0040] The acquisition module is used to determine whether the current operating condition information is within the corresponding preset range.

[0041] If the current operating condition information is within the corresponding preset range, then the vacuum pump is controlled to perform vacuuming on the steam turbine.

[0042] In one embodiment, when the first response module responds to the first judgment condition based on the relationship between the vacuum level of the steam turbine and the preset vacuum level, it includes:

[0043] The first response module is used to determine whether the steam turbine may be in a leaking state based on the relationship between the vacuum level and the preset vacuum level.

[0044] When the vacuum level is less than the preset vacuum level, it is determined that the steam turbine may be in a leaking state, and the first judgment condition is successfully met.

[0045] When the vacuum level is greater than or equal to the preset vacuum level, it is determined that the turbine cannot be in a leaking state.

[0046] In one embodiment, the second response module, when responding to the second judgment condition based on the relationship between the first internal pressure value and the second internal pressure value, includes:

[0047] The second response module is used to obtain the first time node corresponding to the first internal pressure value and the second time node corresponding to the second internal pressure value;

[0048] The second response module is used to calculate the total time consumed for the first internal pressure value to rise or fall to the second internal pressure value based on the first time node and the second time node;

[0049] The second response module is used to determine whether the steam turbine is in a leaking state based on the relationship between the total time and the time threshold.

[0050] If the total time is greater than the time threshold, then the turbine is determined to be in a leaking state.

[0051] If the total time is less than or equal to the time threshold, it is determined that the turbine is not in a leaking state.

[0052] In one embodiment, after determining that the turbine is in a leaking state, the second response module further includes:

[0053] The second response module is used to determine the leakage level of the steam turbine based on the vacuum level A of the steam turbine.

[0054] The second response module is used to preset the vacuum degree threshold matrix M, and set M(M1, M2, M3), where M1 is the first preset vacuum degree threshold, M2 is the second preset vacuum degree threshold, M3 is the third preset vacuum degree threshold, and M1 < M2 < M3.

[0055] The second response module is used to determine different leakage levels based on the relationship between the vacuum level A of the steam turbine and various preset vacuum level thresholds:

[0056] When A≤M1, a Level 1 leakage level is generated;

[0057] When M1 < A ≤ M2, a level 2 leakage level is generated;

[0058] When M2 < A ≤ M3, a three-level leakage level is generated;

[0059] When M3 < A, a fourth-level leakage level is generated.

[0060] This invention provides a method and apparatus for diagnosing vacuum leaks in steam turbines, which has the following advantages compared to the prior art:

[0061] This invention discloses a method and apparatus for diagnosing vacuum leaks in steam turbines. When the vacuum pump is determined to be in operation, the operating time of the vacuum pump is acquired. When the operating time reaches a preset operating time, the vacuum level of the steam turbine is acquired. A first judgment condition is responded to based on the relationship between the steam turbine's vacuum level and the preset vacuum level. When the first judgment condition is successfully met, a first internal pressure value of the steam turbine is acquired. A second internal pressure value of the steam turbine is acquired within a preset time. A second judgment condition is responded to based on the relationship between the first and second internal pressure values. Based on the first and second judgment conditions, it is determined whether the steam turbine is in a vacuum leak state. This invention, through the first and second judgment conditions, can accurately determine whether a steam turbine is in a vacuum leak state, avoiding traditional complex diagnostic methods, improving diagnostic accuracy, and enhancing the reliability of steam turbine operation. Attached Figure Description

[0062] Figure 1 A flowchart illustrating a method for diagnosing steam turbine vacuum leaks according to an embodiment of the present invention is shown;

[0063] Figure 2This is a schematic diagram illustrating the process of responding to the first judgment condition in an embodiment of the present invention;

[0064] Figure 3 This is a schematic diagram illustrating the process of responding to the second judgment condition in an embodiment of the present invention;

[0065] Figure 4 A schematic diagram of a turbine vacuum leak diagnostic device according to an embodiment of the present invention is shown. Detailed Implementation

[0066] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0067] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0068] 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0069] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0070] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0071] like Figure 1 As shown, an embodiment of the present invention discloses a method for diagnosing vacuum leaks in a steam turbine, the method comprising:

[0072] S110: When it is determined that the vacuum pump is in operation, the working time of the vacuum pump is obtained, and when the working time reaches the preset working time, the vacuum degree of the steam turbine is obtained;

[0073] S120: Respond to the first judgment condition based on the relationship between the vacuum degree of the steam turbine and the preset vacuum degree;

[0074] S130: When the first judgment condition is successfully met, the first internal pressure value of the steam turbine is obtained, the second internal pressure value of the steam turbine is obtained within a preset time, and the second judgment condition is responded to according to the relationship between the first internal pressure value and the second internal pressure value.

[0075] S140: Based on the first judgment condition and the second judgment condition, determine whether the steam turbine is in a vacuum leakage state.

[0076] In this embodiment, a vacuum pump can be used to maintain a vacuum environment inside the steam turbine. The preset working time can be set according to the actual situation of the steam turbine, and is not specifically limited here. When the preset working time is reached, the vacuum degree of the steam turbine is obtained. The vacuum degree of the steam turbine can be detected by a vacuum degree detection device, and is not specifically limited here. The present invention can accurately determine whether the steam turbine is in a vacuum leakage state through the first judgment condition and the second judgment condition, avoiding the traditional complex diagnostic methods, improving the diagnostic accuracy, and improving the reliability of the steam turbine.

[0077] In some embodiments of this application, before obtaining the operating time of the vacuum pump when it is determined that the vacuum pump is in operation, the following steps are further included:

[0078] Obtain the current operating condition information of the steam turbine, which includes the steam pressure, steam temperature, and steam flow rate of the steam turbine.

[0079] Determine whether the current operating condition information is within the corresponding preset range.

[0080] If the current operating condition information is within the corresponding preset range, then the vacuum pump is controlled to perform vacuuming on the steam turbine.

[0081] In this embodiment, before evacuating the steam turbine using a vacuum pump, it is necessary to detect the current operating condition information of the steam turbine. Based on the current operating condition information, it is determined whether the steam turbine can be evacuated. If the current operating condition information is within the corresponding preset range, the vacuum pump can be controlled to evacuate the steam turbine. If one or more of the steam pressure, steam temperature, and steam flow rate of the steam turbine are not within the corresponding preset range, maintenance is required first to prevent diagnostic errors and ensure the accuracy of the steam turbine vacuum leakage diagnosis.

[0082] like Figure 2 As shown, in some embodiments of this application, when responding to a first judgment condition based on the relationship between the vacuum degree of the steam turbine and a preset vacuum degree, the following steps are included:

[0083] S121: Determine whether the steam turbine may be in a vacuum leakage state based on the relationship between the vacuum degree and the preset vacuum degree.

[0084] S122: When the vacuum degree is less than the preset vacuum degree, it is determined that the steam turbine may be in a vacuum leakage state, and the first judgment condition is successfully responded to.

[0085] S123: When the vacuum degree is greater than or equal to the preset vacuum degree, it is determined that the steam turbine cannot be in a vacuum leakage state.

[0086] In this embodiment, a first judgment condition is responded to based on the relationship between the vacuum level and a preset vacuum level. This first judgment condition determines whether the turbine might be in a vacuum leakage state by judging the numerical relationship between the vacuum level and the preset vacuum level. When the vacuum level is less than the preset vacuum level, it is determined that the turbine may be in a vacuum leakage state, indicating a successful response to the first judgment condition. After successfully responding to the first judgment condition, if the turbine is still in a vacuum leakage state, a second judgment condition needs to be used to further determine whether a vacuum leakage exists. This invention improves diagnostic efficiency by responding to the first judgment condition.

[0087] like Figure 3 As shown, in some embodiments of this application, when responding to a second judgment condition based on the relationship between the first internal pressure value and the second internal pressure value, the following steps are included:

[0088] S131: Obtain the first time node corresponding to the first internal pressure value, and obtain the second time node corresponding to the second internal pressure value;

[0089] S132: Calculate the total time consumed for the first internal pressure value to rise or fall to the second internal pressure value based on the first time node and the second time node;

[0090] S133: Determine whether the steam turbine is in a vacuum leakage state based on the relationship between the total time and the time threshold.

[0091] S134: If the total time is greater than the time threshold, then it is determined that the steam turbine is in a vacuum leakage state;

[0092] S135: If the total time is less than or equal to the time threshold, then it is determined that the turbine is not in a vacuum leakage state.

[0093] In this embodiment, after successfully responding to the first judgment condition, it is also necessary to respond to the second judgment condition based on the relationship between the first internal air pressure value and the second internal air pressure value. The second judgment condition is used to determine whether the turbine is in a vacuum leakage state. When the first internal air pressure value is obtained, the current time node (i.e., the first time node) is also obtained. When the second internal air pressure value is obtained, the current time node (i.e., the second time node) is also obtained. In reality, the first internal air pressure value may be greater than or less than the second internal air pressure value. It should be understood that since the turbine is in operation, the internal air pressure value is always changing; therefore, the first internal air pressure value and the second internal air pressure value will not be the same. Therefore, this application, through the first... The total time consumed is calculated at both the first and second time nodes. The total time can be the time it takes for the first internal air pressure value to rise to the second internal air pressure value, or the time it takes for the first internal air pressure value to fall to the second internal air pressure value. In this invention, the second judgment adjustment refers to judging whether the steam turbine is in a vacuum leakage state based on the relationship between the total time consumed for the first internal pressure value to rise or fall to the second internal pressure value and a time threshold. When the total time is greater than the time threshold, it indicates that the steam turbine has a vacuum leakage, and the external atmospheric pressure has entered the steam turbine, causing the total time for the steam turbine's air pressure change to exceed the time threshold. Through the second judgment condition, this invention can further ensure the accuracy of the steam turbine's vacuum leakage diagnosis and prevent misjudgment.

[0094] In some embodiments of this application, after determining that the steam turbine is in a vacuum leakage state, the method further includes:

[0095] The leakage level of the steam turbine is determined based on the vacuum level A of the steam turbine.

[0096] A preset vacuum threshold matrix M is defined as M(M1, M2, M3), where M1 is the first preset vacuum threshold, M2 is the second preset vacuum threshold, and M3 is the third preset vacuum threshold, and M1 < M2 < M3.

[0097] Different leakage levels are determined based on the relationship between the turbine's vacuum level A and various preset vacuum thresholds:

[0098] When A≤M1, a Level 1 leakage level is generated;

[0099] When M1 < A ≤ M2, a level 2 leakage level is generated;

[0100] When M2 < A ≤ M3, a three-level leakage level is generated;

[0101] When M3 < A, a fourth-level leakage level is generated.

[0102] In this embodiment, when the turbine is determined to be in a vacuum leakage state, the leakage level of the turbine is determined according to the vacuum degree of the turbine. In this application, M1 is the first preset vacuum degree threshold, M2 is the second preset vacuum degree threshold, and M3 is the third preset vacuum degree threshold. M1, M2, and M3 can be selected and set according to the actual situation, and are not specifically limited here. Different leakage levels are determined according to the relationship between the vacuum degree A of the turbine and each preset vacuum degree threshold, so that the staff can implement different handling measures according to different leakage levels, improve work efficiency, and ensure the reliability and stability of the turbine.

[0103] like Figure 4 As shown, the present invention also discloses a turbine vacuum leak diagnostic device, the device comprising:

[0104] The acquisition module is used to acquire the working time of the vacuum pump when it is determined that the vacuum pump is in operation, and to acquire the vacuum degree of the steam turbine when the working time reaches a preset working time.

[0105] The first response module is used to respond to the first judgment condition based on the relationship between the vacuum degree of the steam turbine and the preset vacuum degree;

[0106] The second response module is used to obtain the first internal pressure value of the steam turbine when it successfully responds to the first judgment condition, obtain the second internal pressure value of the steam turbine within a preset time, and respond to the second judgment condition according to the relationship between the first internal pressure value and the second internal pressure value.

[0107] The judgment module is used to determine whether the steam turbine is in a vacuum leakage state based on the first judgment condition and the second judgment condition.

[0108] In some embodiments of this application, before obtaining the operating time of the vacuum pump when it is determined that the vacuum pump is in operation, the acquisition module further includes:

[0109] The acquisition module is used to acquire the current operating condition information of the steam turbine, which includes the steam pressure, steam temperature, and steam flow rate of the steam turbine.

[0110] The acquisition module is used to determine whether the current operating condition information is within the corresponding preset range.

[0111] If the current operating condition information is within the corresponding preset range, then the vacuum pump is controlled to perform vacuuming on the steam turbine.

[0112] In some embodiments of this application, when the first response module responds to the first judgment condition based on the relationship between the vacuum degree of the steam turbine and the preset vacuum degree, it includes:

[0113] The first response module is used to determine whether the steam turbine may be in a vacuum leakage state based on the relationship between the vacuum degree and the preset vacuum degree.

[0114] When the vacuum level is less than the preset vacuum level, it is determined that the steam turbine may be in a vacuum leakage state, and the first judgment condition is successfully met.

[0115] When the vacuum level is greater than or equal to the preset vacuum level, it is determined that the turbine cannot be in a vacuum leakage state.

[0116] In some embodiments of this application, the second response module, when responding to a second judgment condition based on the relationship between the first internal pressure value and the second internal pressure value, includes:

[0117] The second response module is used to obtain the first time node corresponding to the first internal pressure value and the second time node corresponding to the second internal pressure value;

[0118] The second response module is used to calculate the total time consumed for the first internal pressure value to rise or fall to the second internal pressure value based on the first time node and the second time node;

[0119] The second response module is used to determine whether the steam turbine is in a vacuum leakage state based on the relationship between the total time and the time threshold.

[0120] If the total time is greater than the time threshold, then the turbine is determined to be in a vacuum leakage state;

[0121] If the total time is less than or equal to the time threshold, it is determined that the turbine is not in a vacuum leakage state.

[0122] In some embodiments of this application, after determining that the steam turbine is in a vacuum leakage state, the second response module further includes:

[0123] The second response module is used to determine the leakage level of the steam turbine based on the vacuum level A of the steam turbine.

[0124] The second response module is used to preset the vacuum degree threshold matrix M, and set M(M1, M2, M3), where M1 is the first preset vacuum degree threshold, M2 is the second preset vacuum degree threshold, M3 is the third preset vacuum degree threshold, and M1 < M2 < M3.

[0125] The second response module is used to determine different leakage levels based on the relationship between the vacuum level A of the steam turbine and various preset vacuum level thresholds:

[0126] When A≤M1, a Level 1 leakage level is generated;

[0127] When M1 < A ≤ M2, a level 2 leakage level is generated;

[0128] When M2 < A ≤ M3, a three-level leakage level is generated;

[0129] When M3 < A, a fourth-level leakage level is generated.

[0130] In summary, this invention determines whether the vacuum pump is in operation, obtains the operating time of the vacuum pump, and when the operating time reaches a preset operating time, obtains the vacuum level of the steam turbine. Based on the relationship between the steam turbine's vacuum level and the preset vacuum level, a first judgment condition is triggered. When the first judgment condition is successfully met, a first internal pressure value of the steam turbine is obtained. A second internal pressure value of the steam turbine is obtained within a preset time. Based on the relationship between the first and second internal pressure values, a second judgment condition is triggered. Based on the first and second judgment conditions, it is determined whether the steam turbine is in a vacuum leakage state. This invention, through the first and second judgment conditions, can accurately determine whether the steam turbine is in a vacuum leakage state, avoiding traditional complex diagnostic methods, improving diagnostic accuracy, and enhancing the reliability of the steam turbine.

[0131] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0132] Although the invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, features in the embodiments disclosed herein can be combined with each other in any manner, provided there is no structural conflict. The omission of all such combinations in this specification is merely for brevity and resource conservation. Therefore, the invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0133] It will be understood by those skilled in the art that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for diagnosing vacuum leaks in a steam turbine, characterized in that, The method includes: When it is determined that the vacuum pump is in operation, the working time of the vacuum pump is obtained, and when the working time reaches the preset working time, the vacuum degree of the steam turbine is obtained; The first judgment condition is responded to based on the relationship between the vacuum degree of the steam turbine and the preset vacuum degree; When the first judgment condition is successfully met, the first internal pressure value of the steam turbine is obtained, the second internal pressure value of the steam turbine is obtained within a preset time, and the second judgment condition is responded to according to the relationship between the first internal pressure value and the second internal pressure value. Based on the first judgment condition and the second judgment condition, determine whether the steam turbine is in a vacuum leakage state; When responding to a second judgment condition based on the relationship between the first internal pressure value and the second internal pressure value, the following is included: Obtain the first time node corresponding to the first internal pressure value, and obtain the second time node corresponding to the second internal pressure value; Calculate the total time consumed for the first internal pressure value to rise or fall to the second internal pressure value based on the first time node and the second time node; The relationship between the total time and the time threshold is used to determine whether the steam turbine is in a vacuum leakage state. If the total time is less than or equal to the time threshold, then the turbine is determined to be in a vacuum leakage state. If the total time is greater than the time threshold, it is determined that the turbine is not in a vacuum leakage state.

2. The turbine vacuum leakage diagnosis method according to claim 1, characterized in that, Before obtaining the operating time of the vacuum pump when it is determined that the vacuum pump is in operation, the process also includes: Obtain the current operating condition information of the steam turbine, which includes the steam pressure, steam temperature, and steam flow rate of the steam turbine. Determine whether the current operating condition information is within the corresponding preset range. If the current operating condition information is within the corresponding preset range, then the vacuum pump is controlled to perform vacuuming on the steam turbine.

3. The turbine vacuum leakage diagnosis method according to claim 1, characterized in that, When responding to the first judgment condition based on the relationship between the vacuum level of the steam turbine and the preset vacuum level, the following are included: The relationship between the stated vacuum level and the preset vacuum level is used to determine whether the steam turbine may be in a vacuum leakage state. When the vacuum level is less than the preset vacuum level, it is determined that the steam turbine may be in a vacuum leakage state, and the first judgment condition is successfully met. When the vacuum level is greater than or equal to the preset vacuum level, it is determined that the turbine cannot be in a vacuum leakage state.

4. The turbine vacuum leakage diagnosis method according to claim 1, characterized in that, After determining that the steam turbine is in a vacuum leakage state, the process also includes: The leakage level of the steam turbine is determined based on the vacuum level A of the steam turbine. A preset vacuum threshold matrix M is defined as M(M1, M2, M3), where M1 is the first preset vacuum threshold, M2 is the second preset vacuum threshold, and M3 is the third preset vacuum threshold, and M1 < M2 < M3. Different leakage levels are determined based on the relationship between the turbine's vacuum level A and various preset vacuum thresholds: When A≤M1, a Level 1 leakage level is generated; When M1 < A ≤ M2, a level 2 leakage level is generated; When M2 < A ≤ M3, a three-level leakage level is generated; When M3 < A, a fourth-level leakage level is generated.

5. A steam turbine vacuum leak diagnostic device, characterized in that, The device includes: The acquisition module is used to acquire the working time of the vacuum pump when it is determined that the vacuum pump is in operation, and to acquire the vacuum degree of the steam turbine when the working time reaches a preset working time. The first response module is used to respond to the first judgment condition based on the relationship between the vacuum degree of the steam turbine and the preset vacuum degree; The second response module is used to obtain the first internal pressure value of the steam turbine when it successfully responds to the first judgment condition, obtain the second internal pressure value of the steam turbine within a preset time, and respond to the second judgment condition according to the relationship between the first internal pressure value and the second internal pressure value. The judgment module is used to determine whether the steam turbine is in a vacuum leakage state based on the first judgment condition and the second judgment condition; In the second response module, when responding to the second judgment condition based on the relationship between the first internal pressure value and the second internal pressure value, the following is included: The second response module is used to obtain the first time node corresponding to the first internal pressure value and the second time node corresponding to the second internal pressure value; The second response module is used to calculate the total time consumed for the first internal pressure value to rise or fall to the second internal pressure value based on the first time node and the second time node; The second response module is used to determine whether the steam turbine is in a vacuum leakage state based on the relationship between the total time and the time threshold. If the total time is less than or equal to the time threshold, then the turbine is determined to be in a vacuum leakage state. If the total time is greater than the time threshold, it is determined that the turbine is not in a vacuum leakage state.

6. The turbine vacuum leakage diagnostic device according to claim 5, characterized in that, In the acquisition module, before acquiring the operating time of the vacuum pump when it is determined that the vacuum pump is in operation, the following steps are also included: The acquisition module is used to acquire the current operating condition information of the steam turbine, which includes the steam pressure, steam temperature, and steam flow rate of the steam turbine. The acquisition module is used to determine whether the current operating condition information is within the corresponding preset range. If the current operating condition information is within the corresponding preset range, then the vacuum pump is controlled to perform vacuuming on the steam turbine.

7. The turbine vacuum leakage diagnostic device according to claim 5, characterized in that, In the first response module, when responding to the first judgment condition based on the relationship between the vacuum degree of the steam turbine and the preset vacuum degree, the following steps are included: The first response module is used to determine whether the steam turbine may be in a vacuum leakage state based on the relationship between the vacuum degree and the preset vacuum degree. When the vacuum level is less than the preset vacuum level, it is determined that the steam turbine may be in a vacuum leakage state, and the first judgment condition is successfully met. When the vacuum level is greater than or equal to the preset vacuum level, it is determined that the turbine cannot be in a vacuum leakage state.

8. The turbine vacuum leakage diagnostic device according to claim 5, characterized in that, In the second response module, after determining that the steam turbine is in a vacuum leakage state, the module further includes: The second response module is used to determine the leakage level of the steam turbine based on the vacuum level A of the steam turbine. The second response module is used to preset the vacuum degree threshold matrix M, setting M (M1, M2, M3), where M1 is the first preset vacuum degree threshold, M2 is the second preset vacuum degree threshold, M3 is the third preset vacuum degree threshold, and M1 < M2 < M3. The second response module is used to determine different leakage levels based on the relationship between the vacuum level A of the steam turbine and various preset vacuum level thresholds: When A≤M1, a Level 1 leakage level is generated; When M1 < A ≤ M2, a level 2 leakage level is generated; When M2 < A ≤ M3, a three-level leakage level is generated; When M3 < A, a fourth-level leakage level is generated.

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