Online monitoring method for running state of steam turbine adjusting system and related device

Abstract

The invention discloses a steam turbine adjusting system operation state online monitoring method and a related device. The method comprises the steps that audio signals generated when a sliding valve and a hydraulic servo-motor work are collected; vibration signals generated when the sliding valve and the hydraulic servo-motor body work are collected; collecting an EH oil pressure signal and a slide valve feedback signal; comparing the acquired audio signal, the vibration signal, the EH oil pressure signal and the slide valve feedback signal with the audio signal, the vibration signal, the EH oil pressure signal and the slide valve feedback signal under the normal operation of the steam turbine adjusting system, and judging whether the operation state of the steam turbine adjusting system is abnormal or not according to the comparison result; according to the method and the related device, the running state of the steam turbine adjusting system can be monitored on line through multi-parameter fusion.

Description

Technical Field

[0001] This invention belongs to the field of monitoring the operating status of steam turbine generator set regulation systems, and relates to an online monitoring method and related devices for the operating status of steam turbine regulation systems. Background Technology

[0002] The valve position control mechanism is one of the basic structures of the turbine regulation system. It is located between the speed sensing mechanism and the steam distribution mechanism. It is used to amplify the input signal of the speed regulation mechanism and transmit it to the steam distribution mechanism through the displacement signal of the hydraulic actuator. Its main components include the regulating valve, the slide valve and the hydraulic actuator.

[0003] In the unit speed regulation task, the position change of the piston of the oil actuator driven by EH oil directly determines the lift of the regulating valve in the gas distribution mechanism, which in turn affects the amount of air intake and the accuracy of overall regulation. Therefore, monitoring the working status of the oil actuator and its slide valve is particularly important.

[0004] Currently, distributed control systems (DCS) only collect parameters related to spool valve position feedback and EH oil pressure, making it difficult to perform multi-dimensional online monitoring and comprehensive characterization of the operating status of complex and diverse control systems. Especially for spool valves and hydraulic actuators, when the internal flow of the control valve becomes unstable, the opening feedback and EH oil pressure may not show abnormalities, but vibrations and whistling sounds may occur. Existing monitoring parameters are insufficient to detect jamming faults, which is detrimental to the safe implementation of unit control tasks. Therefore, it is necessary to add multi-source parameters.

[0005] In summary, there is an urgent need to invent a multi-parameter fusion-based online monitoring method for the operating status of steam turbine regulation systems to provide decision support for on-site operation and maintenance personnel. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method and related device for online monitoring of the operating status of a steam turbine regulating system. This method and related device can monitor the operating status of the steam turbine regulating system online through multi-parameter fusion.

[0007] To achieve the above objectives, this invention discloses an online monitoring method for the operating status of a steam turbine regulating system, comprising: Acquire audio signals from the slide valve and hydraulic actuator during operation; acquire vibration signals from the slide valve and hydraulic actuator body during operation; acquire EH hydraulic pressure signals and slide valve feedback signals; The collected audio signals, vibration signals, EH oil pressure signals, and slide valve feedback signals are compared with the audio signals, vibration signals, EH oil pressure signals, and slide valve feedback signals under normal operation of the turbine regulating system. Based on the comparison results, it is determined whether the operating status of the turbine regulating system is abnormal.

[0008] A further improvement of the online monitoring method for the operating status of the steam turbine regulating system described in this invention is as follows: Furthermore, audio sensors are installed around the spool valve and hydraulic actuator to collect audio signals when the spool valve and hydraulic actuator are working.

[0009] Furthermore, patch-type vibration sensors are installed on the slide valve and the hydraulic actuator body to collect vibration signals when the slide valve and the hydraulic actuator body are working.

[0010] Furthermore, if the current EH oil pressure is too high and the collected vibration and audio signals are abnormal, it indicates that the slide valve or hydraulic actuator may be unable to flow normally due to oil circuit blockage, thus indicating that the component has a jamming failure.

[0011] Furthermore, it also includes storing the audio signal, vibration signal, EH hydraulic pressure signal, and spool valve feedback signal in a local database.

[0012] This invention discloses an online monitoring system for the operating status of a steam turbine regulating system, comprising: The acquisition module is used to acquire audio signals when the slide valve and hydraulic actuator are working; acquire vibration signals when the slide valve and hydraulic actuator body are working; and acquire EH hydraulic pressure signals and slide valve feedback signals. The judgment module is used to compare the collected audio signals, vibration signals, EH oil pressure signals and slide valve feedback signals with the audio signals, vibration signals, EH oil pressure signals and slide valve feedback signals under normal operation of the turbine regulating system, and to determine whether the operating status of the turbine regulating system is abnormal based on the comparison results.

[0013] A further improvement of the online monitoring system for the operating status of the steam turbine regulating system described in this invention is as follows: Furthermore, audio sensors are installed around the spool valve and hydraulic actuator to collect audio signals when the spool valve and hydraulic actuator are working.

[0014] Furthermore, patch-type vibration sensors are installed on the slide valve and the hydraulic actuator body to collect vibration signals when the slide valve and the hydraulic actuator body are working.

[0015] This invention discloses a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the online monitoring method for the operating status of the steam turbine regulating system.

[0016] The present invention discloses a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the online monitoring method for the operating status of the steam turbine regulating system.

[0017] The present invention has the following beneficial effects: The online monitoring method and related device for the operating status of the turbine regulating system described in this invention compares the collected audio signals, vibration signals, EH oil pressure signals, and spool valve feedback signals with the audio signals, vibration signals, EH oil pressure signals, and spool valve feedback signals under normal operating conditions of the turbine regulating system. Based on the comparison results, it determines whether the operating status of the turbine regulating system is abnormal, thereby achieving the purpose of online monitoring of the operating status of the turbine regulating system through multi-parameter fusion, which is highly practical. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a flowchart of the method of the present invention; Figure 2 A schematic diagram showing the time-domain comparison of the audio signals of the component during normal and abnormal operation. Figure 3 A schematic diagram comparing the frequency domain of the audio signals of the component during normal and abnormal operation. Figure 4 A schematic diagram comparing the vibration signals of the component during normal and abnormal operation. Figure 5 This is a system structure diagram of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0021] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0022] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this invention generally indicates that the preceding and following objects have an "or" relationship.

[0023] It should be understood that although terms such as first, second, third, etc., may be used in the embodiments of the present invention to describe the preset range, these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from one another. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0024] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0027] Example 1 refer to Figure 1 The online monitoring method for the operating status of a steam turbine regulating system according to the present invention includes the following steps: 1) Install audio sensors around the spool valve and hydraulic actuator to collect audio signals when the spool valve and hydraulic actuator are working.

[0028] 2) Install patch-type vibration sensors on the slide valve and the hydraulic actuator body to collect vibration signals when the slide valve and the hydraulic actuator body are working.

[0029] 3) Input the audio signals collected by the audio sensor and the vibration signals collected by the patch-type vibration sensor into the distributed control system (DCS system) of the unit.

[0030] 4) The DCS system acquires the EH oil pressure signal and the spool valve feedback signal, and stores the audio signal, vibration signal, EH oil pressure signal and spool valve feedback signal in the local database; 5) Compare the detected audio signal, vibration signal, EH oil pressure signal and slide valve feedback signal with the audio signal, vibration signal, EH oil pressure signal and slide valve feedback signal under normal operation of the turbine regulating system, and judge whether the operating status of the turbine regulating system is abnormal based on the comparison results.

[0031] When the EH oil pressure detected is too high and the vibration and audio signals detected are abnormal, it indicates that components such as the slide valve or hydraulic actuator may be unable to flow normally due to oil circuit blockage, and thus it can be determined that the corresponding component has a jamming fault.

[0032] Example 2 This invention relates to an online monitoring method for the operating status of a steam turbine regulating system that integrates multiple parameters. Based on existing measuring points in the unit, sound acquisition sensors and patch-type vibration sensors are added. Through the diagnosis of abnormal sounds and vibrations, combined with the changing trends of EH oil pressure and spool valve feedback signals, a multi-source data fusion method is used to characterize and evaluate the operating status of the regulating system, particularly the spool valve and hydraulic actuator. Specifically, the method includes the following steps: 1) Install audio sensors near the slide valve and hydraulic actuator to collect the audio characteristics of the components during operation. The selection of audio sensors can be based on the actual operating noise of the unit to ensure that the actual sound characteristics of the components during operation can be obtained through noise purification. Figure 2 and Figure 3 The normal signal shown was acquired under ideal conditions within 2 seconds at a sampling rate of 5kHz. When the component itself jams, a sharp whistling sound will be produced. Taking 2kHz as an example, superimposed on the normal signal, simply from... Figure 2 The time-domain plots are difficult to distinguish; a fast Fourier transform is used to obtain... Figure 3 The frequency domain diagram can effectively distinguish abnormal situations.

[0033] 2) Install patch-type vibration sensors on the slide valve and the hydraulic actuator body to collect vibration signals when the components are working. Figure 4 This is a schematic diagram comparing the signals of normal and abnormal vibration of the body within 2 seconds, collected at a sampling rate of 1000Hz. By comparing the waveforms and amplitudes, the operating status of the slide valve and the hydraulic actuator can be determined.

[0034] 3) The characteristic parameter signals collected by the audio sensor and the patch vibration sensor are imported into the unit's distributed control system, and previous parameters such as EH oil pressure and slide valve feedback signals are stored in the local database. This data is not only saved as historical records, but also provides a data source for the upper application layer to support subsequent analysis and decision-making.

[0035] 4) By reviewing on-site work logs and maintenance records, we compiled the changing trends and abnormal characteristics of the operating audio, component vibration, EH oil pressure, and valve feedback signals under normal operating conditions of the spool valve and hydraulic actuator. Integrating actual operational big data with mechanism analysis, we provide a multi-dimensional and reliable reference for monitoring and regulating the system, especially the operating status of the spool valve and hydraulic actuator.

[0036] 5) For the judgment of abnormal operating status, if the EH oil pressure is too high and the component body vibrates or the audio is abnormal, it indicates that the slide valve or oil actuator may be unable to flow normally due to oil circuit blockage, and thus it can be determined that the component in the corresponding position has a jamming fault.

[0037] Based on the vibration and audio data collected under normal equipment conditions, Fourier transform is used to extract the time-frequency information of each data point and calculate the power spectrum.

[0038] use Distribution Fitting Power Spectrum Results .

[0039] Based on Pareto's rule, calculate The cumulative distribution function is Solve , will be greater than The frequency range is defined as the high-frequency region.

[0040] The subsequent vibration and audio data were also subjected to Fourier transform, and the power spectrum was calculated.

[0041] For the data in the high-frequency region obtained in step 3), if the value of any frequency coordinate in the region exceeds the set threshold, it is judged as abnormal; otherwise, it is normal.

[0042] For the two state quantities obtained from vibration and audio in step 4): if two of the two state quantities are abnormal, it indicates an abnormality; if both state quantities are normal, it indicates normality; otherwise, it is a suspected abnormality.

[0043] Example 3 refer to Figure 5 The online monitoring system for the operating status of the steam turbine regulating system of the present invention includes: The acquisition module is used to acquire audio signals when the slide valve and hydraulic actuator are working; acquire vibration signals when the slide valve and hydraulic actuator body are working; and acquire EH hydraulic pressure signals and slide valve feedback signals. The judgment module is used to compare the collected audio signals, vibration signals, EH oil pressure signals and slide valve feedback signals with the audio signals, vibration signals, EH oil pressure signals and slide valve feedback signals under normal operation of the turbine regulating system, and to determine whether the operating status of the turbine regulating system is abnormal based on the comparison results.

[0044] In this embodiment, an audio sensor is installed around the slide valve and the hydraulic actuator to collect audio signals when the slide valve and the hydraulic actuator are working.

[0045] In this embodiment, patch-type vibration sensors are installed on the slide valve and the hydraulic actuator body to collect vibration signals when the slide valve and the hydraulic actuator body are working.

[0046] The module division in this embodiment is illustrative and represents only one logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional modules in each embodiment of this application can be integrated into a single processor, exist as separate physical entities, or be integrated into a single module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0047] Example 3 A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of an online monitoring method for the operating status of a steam turbine regulating system. For example, the method includes: acquiring audio signals from the sliding valve and hydraulic actuator during operation; acquiring vibration signals from the sliding valve and hydraulic actuator during operation; acquiring EH oil pressure signals and sliding valve feedback signals; comparing the acquired audio signals, vibration signals, EH oil pressure signals, and sliding valve feedback signals with the audio signals, vibration signals, EH oil pressure signals, and sliding valve feedback signals under normal operating conditions of the steam turbine regulating system; and determining whether the operating status of the steam turbine regulating system is abnormal based on the comparison results. The memory may include main memory, such as high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device. The processor, network interface, and memory are interconnected via an internal bus, which may be an industry standard architecture bus, a peripheral component interconnection standard bus, an extended industry standard architecture bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory stores the program; specifically, the program may include program code, which includes computer operation instructions. Memory can include main memory and non-volatile memory, and provides instructions and data to the processor.

[0048] Example 4 A computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of an online monitoring method for the operating status of a steam turbine regulating system. For example, the method includes: acquiring audio signals from the spool valve and hydraulic actuator during operation; acquiring vibration signals from the spool valve and hydraulic actuator during operation; acquiring EH oil pressure signals and spool valve feedback signals; comparing the acquired audio signals, vibration signals, EH oil pressure signals, and spool valve feedback signals with the audio signals, vibration signals, EH oil pressure signals, and spool valve feedback signals under normal operating conditions of the steam turbine regulating system; and determining whether the operating status of the steam turbine regulating system is abnormal based on the comparison results. Specifically, the computer-readable storage medium includes, but is not limited to, volatile memory and / or non-volatile memory. The volatile memory may include random access memory (RAM) and / or cache memory, etc. The non-volatile memory may include read-only memory (ROM), hard disk, flash memory, optical disk, magnetic disk, etc.

[0049] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0050] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0051] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0052] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0053] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0054] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

[0055] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for online monitoring of the operating status of a steam turbine regulating system, characterized in that, include: Acquire audio signals from the slide valve and hydraulic actuator during operation; acquire vibration signals from the slide valve and hydraulic actuator body during operation; acquire EH hydraulic pressure signals and slide valve feedback signals; The collected audio signals, vibration signals, EH oil pressure signals, and slide valve feedback signals are compared with the audio signals, vibration signals, EH oil pressure signals, and slide valve feedback signals under normal operation of the turbine regulating system. Based on the comparison results, it is determined whether the operating status of the turbine regulating system is abnormal.

2. The online monitoring method for the operating status of a steam turbine regulating system according to claim 1, characterized in that, Audio sensors are installed around the spool valve and the hydraulic actuator to collect audio signals when the spool valve and the hydraulic actuator are working.

3. The online monitoring method for the operating status of a steam turbine regulating system according to claim 1, characterized in that, A patch-type vibration sensor is installed on the slide valve and the hydraulic actuator body to collect vibration signals when the slide valve and the hydraulic actuator body are working.

4. The online monitoring method for the operating status of a steam turbine regulating system according to claim 1, characterized in that, When the current EH oil pressure is too high and the collected vibration and audio signals are abnormal, it indicates that the slide valve or hydraulic actuator may be unable to flow normally due to oil circuit blockage, and thus it is considered that the component has a jamming failure.

5. The online monitoring method for the operating status of a steam turbine regulating system according to claim 1, characterized in that, Also includes: The audio signal, vibration signal, EH oil pressure signal, and spool valve feedback signal are stored in a local database.

6. An online monitoring system for the operating status of a steam turbine regulating system, characterized in that, include: The acquisition module is used to acquire audio signals when the slide valve and hydraulic actuator are working; acquire vibration signals when the slide valve and hydraulic actuator body are working; and acquire EH hydraulic pressure signals and slide valve feedback signals. The judgment module is used to compare the collected audio signals, vibration signals, EH oil pressure signals and slide valve feedback signals with the audio signals, vibration signals, EH oil pressure signals and slide valve feedback signals under normal operation of the turbine regulating system, and to determine whether the operating status of the turbine regulating system is abnormal based on the comparison results.

7. The online monitoring system for the operating status of a steam turbine regulating system according to claim 6, characterized in that, Audio sensors are installed around the spool valve and the hydraulic actuator to collect audio signals when the spool valve and the hydraulic actuator are working.

8. The online monitoring system for the operating status of a steam turbine regulating system according to claim 6, characterized in that, A patch-type vibration sensor is installed on the slide valve and the hydraulic actuator body to collect vibration signals when the slide valve and the hydraulic actuator body are working.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the online monitoring method for the operating status of the steam turbine regulating system as described in any one of claims 1-5.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the online monitoring method for the operating status of the steam turbine regulating system as described in any one of claims 1-5.

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