CN115376301A - Blade fracture early warning method and system of steam turbine, electronic equipment and storage medium - Google Patents
Blade fracture early warning method and system of steam turbine, electronic equipment and storage medium Download PDFInfo
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- CN115376301A CN115376301A CN202210875600.7A CN202210875600A CN115376301A CN 115376301 A CN115376301 A CN 115376301A CN 202210875600 A CN202210875600 A CN 202210875600A CN 115376301 A CN115376301 A CN 115376301A
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B31/00—Predictive alarm systems characterised by extrapolation or other computation using updated historic data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/187—Machine fault alarms
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/24—Reminder alarms, e.g. anti-loss alarms
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Abstract
The embodiment of the application discloses a method, a system, electronic equipment and a storage medium for early warning of blade fracture of a steam turbine, wherein the method comprises the steps of obtaining the shaft relative amplitude variation of a steam turbine rotor; and judging whether an alarm signal is generated or not according to the relative amplitude variation of the shaft and a preset reference value. The method is different from the defects of high measurement difficulty and poor practicability caused by the fact that the vortex vibration measuring probe is additionally arranged to detect the vibration frequency of each stage of blade in the existing scheme, directly obtains the shaft relative amplitude variation of the steam turbine rotor, and then judges whether an alarm signal is generated or not by comparing the shaft relative amplitude variation of the steam turbine rotor with a preset reference value, so that the measurement and early warning complexity can be reduced.
Description
Technical Field
The application relates to the technical field of steam turbines, in particular to a method and a system for early warning of blade fracture of a steam turbine, electronic equipment and a storage medium.
Background
The steam turbine is one of the important equipment in power plant, the rotating speed of the steam turbine in China is basically 3000rpm (Revolutions Per Minute), the steam turbine belongs to the high-speed running equipment, the structure of the steam turbine is complex, the number of parts is large, the precision is high, the rotor rotates at high speed, and the parts are easy to fall off or the blades are easy to break under the action of centrifugal force, thermal stress, steam impact force and steam pressure difference between the front and the back of the blades. The rotor of the high-power unit is large in mass, when a broken part is small, the vibration amplitude is not changed greatly after one or two sharp waves appear, and the broken part is not easy to find in time by operating personnel, so that the unit can operate with a fault for a long time, and damage can be enlarged at any time.
The early warning scheme in present stage mainly is through installing the vortex probe of testing vibration additional, detects a certain one-level blade vibration frequency for discover the blade and produce the crackle, nevertheless because the steam turbine has tens grades of blades, it is great to realize the degree of difficulty, and present steam turbine all has inside and outside cylinder body moreover, and the temperature is high again, and high-pressure stage sound clearance is little, hardly monitors each grade blade, and the practicality is poor.
Disclosure of Invention
The present application is directed to solving at least the problems of the prior art. Therefore, the application provides a method and a system for early warning of blade fracture of a steam turbine, electronic equipment and a storage medium, and complexity of measurement and early warning can be reduced.
According to a first aspect embodiment of the present application, a blade breakage warning method for a steam turbine includes the following steps:
acquiring the shaft relative amplitude variation of a steam turbine rotor;
and judging whether an alarm signal is generated or not according to the relative amplitude variation of the shaft and a preset reference value.
According to the embodiment of the application, at least the following technical effects are achieved:
the method is different from the defects of high measurement difficulty and poor practicability caused by the fact that the vortex vibration measuring probe is additionally arranged to detect the vibration frequency of each stage of blade in the existing scheme, firstly, the shaft relative amplitude variation of the steam turbine rotor is obtained, and then whether an alarm signal is generated or not is judged by comparing the shaft relative amplitude variation of the steam turbine rotor with a preset reference value, so that the measurement and early warning complexity can be reduced.
According to some embodiments of the present application, the obtaining a shaft relative amplitude variation of the turbine rotor includes:
installing a Y-direction non-contact displacement sensor and an X-direction non-contact displacement sensor on a bearing of the steam turbine rotor, acquiring historical Y-direction vibration electric signals and current Y-direction vibration electric signals of the steam turbine rotor according to the Y-direction non-contact displacement sensor, and acquiring historical X-direction vibration electric signals and current X-direction vibration electric signals of the steam turbine rotor according to the X-direction non-contact displacement sensor;
according to the historical Y-direction vibration electric signal and the current Y-direction vibration electric signal, calculating a historical shaft-to-shaft vibration Y-direction amplitude of the steam turbine rotor and a real-time shaft-to-shaft vibration Y-direction amplitude of the steam turbine rotor; according to the historical X-direction vibration electric signal and the current X-direction vibration electric signal, calculating a historical X-direction relative vibration amplitude of the steam turbine rotor and a real-time X-direction relative vibration amplitude of the steam turbine rotor;
subtracting the historical amplitude of the Y direction of the relative vibration from the real-time amplitude of the Y direction of the relative vibration to obtain the amplitude variation of the Y direction of the relative vibration; and subtracting the historical amplitude of the X direction of the shaft relative vibration from the real-time amplitude of the X direction of the shaft relative vibration to obtain the amplitude variation of the X direction of the shaft relative vibration.
According to some embodiments of the present application, the determining whether to generate an alarm signal according to the shaft relative amplitude variation and a preset reference value includes:
calculating a first ratio of the Y-direction amplitude variation of the shaft relative vibration to the historical Y-direction amplitude of the shaft relative vibration, and calculating a second ratio of the X-direction amplitude variation of the shaft relative vibration to the historical X-direction amplitude of the shaft relative vibration;
generating an alarm signal when the first ratio and the second ratio meet one of a first condition and a second condition; the first condition includes that the first ratio is greater than a first reference value and the second ratio is greater than a second reference value, and the second condition includes that the second ratio is greater than the first reference value and the first ratio is greater than the second reference value.
According to some embodiments of the application, the first reference value is 0.1 and the second reference value is 0.2.
According to some embodiments of the present application, the historical magnitude of the Y-direction shaft relative vibration is a magnitude of the turbine rotor generated 2 seconds prior to a real-time magnitude of the Y-direction shaft relative vibration.
According to a second aspect embodiment of the present application, a blade breakage warning system for a steam turbine includes:
an amplitude quantity obtaining unit for obtaining a shaft-to-shaft relative amplitude variation of the turbine rotor;
and the data calculation unit is used for judging whether an alarm signal is generated or not according to the relative amplitude variation of the shaft and a preset reference value.
The blade breakage early warning system of the steam turbine adopts all the technical schemes of the blade breakage early warning method of the steam turbine in the embodiment, so that the blade breakage early warning system at least has all the beneficial effects brought by the technical schemes of the embodiment.
According to some embodiments of the present application, the amplitude amount acquisition unit includes:
the Y-direction non-contact displacement sensor is arranged on a bearing Y direction of the steam turbine rotor and is used for acquiring a historical Y-direction vibration electric signal and a current Y-direction vibration electric signal of the steam turbine rotor;
the X-direction non-contact displacement sensor is arranged above a bearing X of the steam turbine rotor and is used for acquiring a historical X-direction vibration electric signal and a current X-direction vibration electric signal of the steam turbine rotor;
the signal conversion unit is used for calculating the historical amplitude of the shaft relative vibration Y direction of the steam turbine rotor and the real-time amplitude of the shaft relative vibration Y direction of the steam turbine rotor according to the historical Y direction vibration electric signal and the current Y direction vibration electric signal; according to the historical X-direction vibration electric signal and the current X-direction vibration electric signal, calculating an X-direction historical amplitude of the shaft relative vibration of the steam turbine rotor and an X-direction real-time amplitude of the shaft relative vibration of the steam turbine rotor;
the amplitude calculation unit is used for subtracting the historical amplitude of the shaft relative vibration in the Y direction from the real-time amplitude of the shaft relative vibration in the Y direction to obtain the amplitude variation of the shaft relative vibration in the Y direction; and subtracting the historical amplitude of the X direction of the shaft relative vibration from the real-time amplitude of the X direction of the shaft relative vibration to obtain the amplitude variation of the X direction of the shaft relative vibration.
According to some embodiments of the application, the data calculation unit comprises:
the ratio calculation unit is used for calculating a first ratio of the amplitude variation of the shaft relative vibration in the Y direction to the historical amplitude of the shaft relative vibration in the Y direction, and calculating a second ratio of the amplitude variation of the shaft relative vibration in the X direction to the historical amplitude of the shaft relative vibration in the X direction;
the alarm unit is used for generating an alarm signal when the first ratio and the second ratio meet one of a first condition and a second condition; the first condition includes that the first ratio is greater than a first reference value and the second ratio is greater than a second reference value, and the second condition includes that the second ratio is greater than the first reference value and the first ratio is greater than the second reference value.
An electronic device according to an embodiment of a third aspect of the present application includes: at least one control processor and a memory for communicative connection with the at least one control processor; the memory stores instructions executable by the at least one control processor to enable the at least one control processor to perform a method of blade rupture warning for a steam turbine as described above.
Since the electronic device can implement all the technical solutions of the blade breakage early warning method of the steam turbine in the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved.
According to a fourth aspect of the present application, there is provided a computer-readable storage medium having stored thereon computer-executable instructions for causing a computer to perform a method of blade rupture warning in a steam turbine as described above.
Since the computer readable storage medium adopts all the technical solutions of the blade breakage early warning method of the steam turbine of the above embodiments, at least all the advantages brought by the technical solutions of the above embodiments are achieved.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application.
Drawings
The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic flow chart illustrating a method for early warning of a blade fracture of a steam turbine according to an embodiment of the present disclosure;
FIG. 2 is a schematic flow chart of step S100 in FIG. 1;
FIG. 3 is a schematic flow chart of step S200 in FIG. 1;
FIG. 4 is a schematic view of a turbine vibration test point installation provided in an embodiment of the present application;
FIG. 5 is a logic diagram for determining whether to alarm according to the relative amplitude variation of the axis and a preset reference value according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a blade breakage warning system of a steam turbine according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, if there are first, second, etc. described for the purpose of distinguishing technical features, they are not to be interpreted as indicating or implying relative importance or implicit indicating the number of technical features indicated or implicit indicating the precedence of technical features indicated.
The steam turbine belongs to the high-speed operation equipment, the structure of the steam turbine is complex, the number of parts is large, the precision is high, the rotor rotates at a high speed, and the parts are easy to fall off or the blade is easy to break under the action of centrifugal force, thermal stress, steam impact force and steam pressure difference between the front and the back of the blade. The rotor of the high-power unit is large in mass, when a broken part is small, the vibration amplitude is not changed greatly after one or two sharp waves appear, and the broken part is not easy to find in time by operating personnel, so that the unit can operate with a fault for a long time, and damage can be enlarged at any time.
Example 1: the blade breaking accident of a certain power plant occurs before the unit is subjected to minor repair and shutdown, the blade breaking accident is not found in the minor repair period, the sodium ions of the condenser are found to be seriously overproof when the unit is subjected to minor repair and the startup is finished, the shutdown detects that the low-pressure next last-stage blade is broken and falls off, and the unit is forced to be subjected to major repair again.
Example 2: when a certain power plant is subjected to unit overhaul, the last-stage low-voltage blade is found to be broken and damaged to other blades of the whole set, historical vibration parameters are checked afterwards, the blade is found to be broken before a year, and due to the fact that a manufacturer does not have enough spare parts, overhaul time is prolonged.
If the operator does not find the blade to be broken in time, the equipment can operate with trouble for a long time, and emergency shutdown processing is carried out when the blade is broken according to relevant regulations, as in examples 1 and 2. The purpose of this application embodiment is exactly when the turbine takes place disconnected blade, can in time send the warning, reminds the operating personnel to handle to prevent the enlarged accident.
The blade fracture early warning scheme of the steam turbine at the present stage is mainly characterized in that a vortex vibration measuring probe is additionally arranged, the vibration frequency of a certain stage of blade is detected through the vortex vibration measuring probe, and cracks are found to be generated on the blade. However, the steam turbine has dozens of stages of blades, the realization difficulty of the scheme is very high, the existing steam turbine has inner and outer cylinder bodies, the temperature is high, the dynamic and static gaps of a high-pressure stage are small, each stage of blade is difficult to detect, and the practicability is poor.
In order to solve the technical problem, referring to fig. 1, an embodiment of the present application provides a method for early warning of a blade fracture of a steam turbine, the method including the following steps S100 and S200:
and S100, acquiring the shaft relative amplitude variation of the turbine rotor.
And S200, judging whether an alarm signal is generated or not according to the relative amplitude variation of the axis and a preset reference value.
Because of synthesizing many times turbine blade breaking accident, when the blade breaks and drops, the relative vibration of axle can produce one or several instantaneous sharp waves, from the structure, can all produce the striking to other blades when certain blade breaks and drops, make the axle vibration change, consequently be different from the big and poor defect of practicality of measurement degree that present scheme utilized additional vortex vibration measurement probe to detect every grade of blade vibration frequency to appear, this method at first obtains turbine rotor's the relative amplitude variation of axle directly, then utilizes turbine rotor's the relative amplitude variation of axle to compare between the benchmark value of presetting and the judgement whether to produce alarm signal, very big reduction like this measure and the complexity of early warning.
Referring to fig. 2, in step S100 of some embodiments, obtaining the shaft relative amplitude variation of the turbine rotor includes steps S101 to S103 of:
step S101, a Y-direction non-contact displacement sensor and an X-direction non-contact displacement sensor are mounted on a bearing of the steam turbine rotor, historical Y-direction vibration electric signals and current Y-direction vibration electric signals of the steam turbine rotor are collected according to the Y-direction non-contact displacement sensor, and historical X-direction vibration electric signals and current X-direction vibration electric signals of the steam turbine rotor are collected according to the X-direction non-contact displacement sensor.
As shown in FIG. 4, FIG. 4 is a schematic view of the installation of a turbine vibration measuring point, and two non-contact displacement sensors are installed on a bearing of a turbine rotor.
Step S102, calculating a historical Y-direction relative vibration amplitude of the shaft of the steam turbine rotor and a real-time Y-direction relative vibration amplitude of the shaft of the steam turbine rotor according to the historical Y-direction vibration electric signal and the current Y-direction vibration electric signal; and calculating the historical X-direction relative vibration amplitude of the shaft of the turbine rotor and the real-time X-direction relative vibration amplitude of the shaft of the turbine rotor according to the historical X-direction vibration electric signal and the current X-direction vibration electric signal.
In step S102, the non-contact displacement sensor collects an electrical signal, and it is necessary to further convert the change value of the electrical signal into a relative vibration value.
Step S103, subtracting the historical Y-direction amplitude of the relative shaft vibration from the real-time Y-direction amplitude of the relative shaft vibration to obtain the Y-direction amplitude variation of the relative shaft vibration; and subtracting the historical amplitude of the X direction of the relative shaft vibration from the real-time amplitude of the X direction of the relative shaft vibration to obtain the amplitude variation of the X direction of the relative shaft vibration.
It should be noted that the current amplitude refers to the amplitude acquired at the current time, and the historical amplitude refers to the amplitude acquired at the historical time. In some embodiments, the historical time of the embodiments of the present application is 2 seconds prior to the current time.
Referring to fig. 3, in step S200 of some embodiments, determining whether to generate an alarm signal according to the axis relative amplitude variation and a preset reference value includes the following steps S201 and S202:
step S201, a first ratio of the amplitude variation of the Y-direction of the relative axial vibration to the historical amplitude of the Y-direction of the relative axial vibration is calculated, and a second ratio of the amplitude variation of the X-direction of the relative axial vibration to the historical amplitude of the X-direction of the relative axial vibration is calculated.
Step S202, when the first ratio and the second ratio meet one of a first condition and a second condition, generating an alarm signal; the first condition comprises that the first ratio is greater than the first reference value and the second ratio is greater than the second reference value, and the second condition comprises that the second ratio is greater than the first reference value and the first ratio is greater than the second reference value.
In step S202 of the present embodiment, the first condition is as follows:
the second condition is as follows:
wherein, Y 1 Y represents the variation of the Y-direction amplitude of a certain axis relative vibration, Y represents the historical Y-direction amplitude of a certain axis relative vibration, and Y represents the historical Y-direction amplitude of a certain axis relative vibration 1 The real-time amplitude of the relative vibration Y direction of a certain shaft is shown, and M represents a first reference value. X 1 X represents the X-direction amplitude variation of certain axis relative vibration, X represents the X-direction historical amplitude of certain axis relative vibration, and X represents the X-direction historical amplitude of certain axis relative vibration 1 Showing the real-time amplitude of the relative vibration X direction of a certain shaft, N showing a second reference value,&representing the relationship "and".
Referring to fig. 5, in some embodiments, the first reference value is set to 0.2, the second reference value is set to 0.2, and the time period between the current time and the historical time is set to 2 seconds. When the variation of the relative vibration variation of one measuring point of vibration monitoring of a certain axis in 2 seconds is greater than 20% of the historical amplitude and the variation of the relative vibration of the other measuring point of vibration monitoring of the same axis is greater than 10% of the historical amplitude, a turbine blade-breaking alarm is sent out to remind an operator in time. It should also be noted that after the alarm is given, the operator can compare and confirm whether the blade is broken according to the phenomenon after the blade is broken, for example, the operator can check according to a TDM (turbine vibration monitoring and analyzing system), and determine the blade breaking event by combining the relative vibration phase change and the amplitude change of the shaft.
The scheme at the present stage is mainly used for monitoring the vibration frequency of the blade, when the blade cracks, the inherent frequency of the blade can change, the blade is analyzed to be in a problem, the implementation difficulty is high, the vibration frequency of each blade in the first-stage blade is different, the judgment accuracy is low, the number of the turbine blades is dozens of stages, the monitoring of each stage of blade is more difficult to achieve, and the high-pressure high-temperature stage frequency measurement probe cannot be basically installed, so that the all-dimensional detection of the blade cannot be achieved.
When the blades break and fall off, the relative vibration of the shaft can generate one or more instantaneous sharp waves, and structurally, when one blade breaks and falls off, the shaft can impact other blades, so that the vibration of the shaft is changed. Therefore, the embodiment of the method directly utilizes the shaft relative vibration of the turbine rotor to carry out early warning judgment, and when the variation of the relative vibration variation measured at one measuring point of certain shaft vibration detection in 2 seconds is more than 20% of the historical amplitude and the variation of the relative vibration measured at the other measuring point of the same shaft vibration detection is more than 10% of the historical amplitude, the turbine blade-breaking alarm is sent out, so that the complexity of measurement and early warning is greatly reduced.
In addition, the scheme can directly utilize the existing measuring equipment of the power plant, does not need to increase additional equipment, utilizes the existing data to carry out logic configuration in a DCS (automatic control system) to give an alarm, takes the vibration variation quantity in two directions from the same axis to be compared with a base value to send an alarm signal, prevents mistakenly sending the signal, and improves the accuracy of the signal.
Referring to fig. 6, an embodiment of the present invention provides a blade breakage warning system for a steam turbine, the system including an amplitude amount obtaining unit 1000 and a data calculating unit 2000, wherein:
the amplitude amount acquisition unit 1000 is configured to acquire an amount of change in the shaft relative amplitude of the turbine rotor.
The data calculating unit 2000 is configured to determine whether to generate an alarm signal according to the axis relative amplitude variation and a preset reference value.
In some embodiments, the amplitude amount acquisition unit 1000 includes a Y-direction non-contact displacement sensor 1100, an X-direction non-contact displacement sensor 1200, a signal conversion unit 1300, and an amplitude calculation unit 1400, wherein:
the Y-direction non-contact displacement sensor 1100 is installed in the bearing Y-direction of the turbine rotor, and is used to collect the historical Y-direction vibration electrical signal and the current Y-direction vibration electrical signal of the turbine rotor.
The X-direction non-contact displacement sensor 1200 is installed in the bearing X direction of the turbine rotor, and is used for collecting the historical X-direction vibration electrical signal and the current X-direction vibration electrical signal of the turbine rotor.
The signal conversion unit 1300 is configured to calculate a historical Y-direction amplitude of the relative vibration of the shaft of the turbine rotor and a real-time Y-direction amplitude of the relative vibration of the shaft of the turbine rotor according to the historical Y-direction vibration electrical signal and the current Y-direction vibration electrical signal; and calculating the historical X-direction relative vibration amplitude of the shaft of the turbine rotor and the real-time X-direction relative vibration amplitude of the shaft of the turbine rotor according to the historical X-direction vibration electric signal and the current X-direction vibration electric signal.
The amplitude calculation unit 1400 is configured to subtract the Y-direction historical amplitude of the relative axis vibration from the Y-direction real-time amplitude of the relative axis vibration to obtain a Y-direction amplitude variation of the relative axis vibration; and subtracting the historical X-direction amplitude of the relative shaft vibration from the real-time X-direction amplitude of the relative shaft vibration to obtain the X-direction amplitude variation of the relative shaft vibration.
In some embodiments, data calculation unit 2000 includes a ratio calculation unit 2100 and an alarm unit 2200, wherein:
the ratio calculating unit 2100 is configured to calculate a first ratio of the Y-direction amplitude variation of the axis relative vibration to the historical Y-direction amplitude of the axis relative vibration, and calculate a second ratio of the X-direction amplitude variation of the axis relative vibration to the historical X-direction amplitude of the axis relative vibration.
The alarm unit 2200 is configured to generate an alarm signal when the first ratio and the second ratio satisfy one of the first condition and the second condition; the first condition comprises that the first ratio is greater than the first reference value and the second ratio is greater than the second reference value, and the second condition comprises that the second ratio is greater than the first reference value and the first ratio is greater than the second reference value.
It should be noted that the present system embodiment and the above method embodiment are based on the same inventive concept, and therefore, the related contents of the above method embodiment are also applicable to the present system embodiment, which will not be described in detail herein.
The system directly obtains the shaft relative amplitude variation of the steam turbine rotor; and then, whether an alarm signal is generated or not is judged by comparing the shaft relative amplitude variation of the steam turbine rotor with a preset reference value, so that the complexity of measurement and early warning is greatly reduced.
An embodiment of the present application provides an electronic device including: a memory, a processor, and a computer program stored on the memory and executable on the processor.
The processor and memory may be connected by a bus or other means.
The memory, which is a non-transitory computer readable storage medium, may be used to store non-transitory software programs as well as non-transitory computer executable programs. Further, the memory may include high speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory optionally includes memory located remotely from the processor, and these remote memories may be connected to the processor through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The non-transitory software program and instructions required to implement the blade fracture warning method of the steam turbine of the above-described embodiment are stored in the memory, and when executed by the processor, the blade fracture warning method of the steam turbine of the above-described embodiment is performed, for example, the method steps S100 to S200 in fig. 1, steps S101 to S103 in fig. 2, and steps S201 and S202 in fig. 3 described above are performed.
The above described terminal embodiments are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may also be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Further, an embodiment of the present application provides a computer-readable storage medium storing computer-executable instructions, which are executed by a processor or controller, for example, by a processor in the terminal embodiment, and can make the processor execute the blade fracture early warning method of the steam turbine in the embodiment, for example, the method steps S100 to S200 in fig. 1, the steps S101 to S103 in fig. 2, and the steps S201 and S202 in fig. 3 described above.
One of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.
Claims (10)
1. The blade fracture early warning method of the steam turbine is characterized by comprising the following steps:
acquiring the shaft relative amplitude variation of a steam turbine rotor;
and judging whether an alarm signal is generated or not according to the relative amplitude variation of the shaft and a preset reference value.
2. The method for blade crack early warning of a steam turbine according to claim 1, wherein the obtaining a shaft relative amplitude variation of a steam turbine rotor comprises:
installing a Y-direction non-contact displacement sensor and an X-direction non-contact displacement sensor on a bearing of the steam turbine rotor, acquiring historical Y-direction vibration electric signals and current Y-direction vibration electric signals of the steam turbine rotor according to the Y-direction non-contact displacement sensor, and acquiring historical X-direction vibration electric signals and current X-direction vibration electric signals of the steam turbine rotor according to the X-direction non-contact displacement sensor;
according to the historical Y-direction vibration electric signal and the current Y-direction vibration electric signal, calculating a historical shaft-to-shaft vibration Y-direction amplitude of the steam turbine rotor and a real-time shaft-to-shaft vibration Y-direction amplitude of the steam turbine rotor; according to the historical X-direction vibration electric signal and the current X-direction vibration electric signal, calculating an X-direction historical amplitude of the shaft relative vibration of the steam turbine rotor and an X-direction real-time amplitude of the shaft relative vibration of the steam turbine rotor;
subtracting the historical amplitude of the Y direction of the relative vibration from the real-time amplitude of the Y direction of the relative vibration to obtain the amplitude variation of the Y direction of the relative vibration; and subtracting the historical amplitude of the X direction of the shaft relative vibration from the real-time amplitude of the X direction of the shaft relative vibration to obtain the amplitude variation of the X direction of the shaft relative vibration.
3. The method for early warning of blade fracture in a steam turbine according to claim 2, wherein the determining whether to generate the warning signal according to the amount of change in the relative amplitude of the shaft and a preset reference value comprises:
calculating a first ratio of the Y-direction amplitude variation of the shaft relative vibration to the historical Y-direction amplitude of the shaft relative vibration, and calculating a second ratio of the X-direction amplitude variation of the shaft relative vibration to the historical X-direction amplitude of the shaft relative vibration;
generating an alarm signal when the first ratio and the second ratio meet one of a first condition and a second condition; wherein the first condition includes that the first ratio is greater than a first reference value and the second ratio is greater than a second reference value, and the second condition includes that the second ratio is greater than the first reference value and the first ratio is greater than the second reference value.
4. The method for blade rupture warning of a steam turbine according to claim 3, wherein the first reference value is 0.1 and the second reference value is 0.2.
5. The method of claim 3 wherein said historical magnitude of said shaft relative vibration Y is a magnitude of said turbine rotor generated during a first 2 seconds of a real time magnitude of said shaft relative vibration Y.
6. A blade breakage warning system of a steam turbine, characterized in that the blade breakage warning system comprises:
an amplitude quantity obtaining unit for obtaining a shaft-to-shaft relative amplitude variation of the turbine rotor;
and the data calculation unit is used for judging whether an alarm signal is generated or not according to the relative amplitude variation of the shaft and a preset reference value.
7. The system according to claim 6, wherein the amplitude amount acquiring unit includes:
the Y-direction non-contact displacement sensor is arranged on a bearing Y direction of the steam turbine rotor and is used for acquiring a historical Y-direction vibration electric signal and a current Y-direction vibration electric signal of the steam turbine rotor;
the X-direction non-contact displacement sensor is arranged above a bearing X of the steam turbine rotor and is used for acquiring a historical X-direction vibration electric signal and a current X-direction vibration electric signal of the steam turbine rotor;
the signal conversion unit is used for calculating the historical Y-direction vibration amplitude of the shaft relative vibration of the steam turbine rotor and the real-time Y-direction vibration amplitude of the shaft relative vibration of the steam turbine rotor according to the historical Y-direction vibration electric signal and the current Y-direction vibration electric signal; according to the historical X-direction vibration electric signal and the current X-direction vibration electric signal, calculating a historical X-direction relative vibration amplitude of the steam turbine rotor and a real-time X-direction relative vibration amplitude of the steam turbine rotor;
the amplitude calculation unit is used for subtracting the historical amplitude of the shaft relative vibration in the Y direction from the real-time amplitude of the shaft relative vibration in the Y direction to obtain the amplitude variation of the shaft relative vibration in the Y direction; and subtracting the historical amplitude of the X direction of the shaft relative vibration from the real-time amplitude of the X direction of the shaft relative vibration to obtain the amplitude variation of the X direction of the shaft relative vibration.
8. The system of claim 7, wherein the data calculation unit comprises:
the ratio calculation unit is used for calculating a first ratio of the amplitude variation of the shaft relative vibration in the Y direction to the historical amplitude of the shaft relative vibration in the Y direction, and calculating a second ratio of the amplitude variation of the shaft relative vibration in the X direction to the historical amplitude of the shaft relative vibration in the X direction;
the alarm unit is used for generating an alarm signal when the first ratio and the second ratio meet one of a first condition and a second condition; the first condition includes that the first ratio is greater than a first reference value and the second ratio is greater than a second reference value, and the second condition includes that the second ratio is greater than the first reference value and the first ratio is greater than the second reference value.
9. An electronic device, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the blade fracture warning method according to any one of claims 1 to 5 when executing the computer program.
10. A computer-readable storage medium having stored thereon computer-executable instructions for performing the method of blade fracture warning according to any one of claims 1 to 5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210875600.7A CN115376301A (en) | 2022-07-25 | 2022-07-25 | Blade fracture early warning method and system of steam turbine, electronic equipment and storage medium |
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| CN202210875600.7A CN115376301A (en) | 2022-07-25 | 2022-07-25 | Blade fracture early warning method and system of steam turbine, electronic equipment and storage medium |
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