Early warning method and system for fluid pipeline expansion

Abstract

The invention discloses an early warning system for fluid pipeline expansion, and the system comprises a transmission spring which is connected with a fluid pipeline at one end and is used for transmitting the vibration generated by the fluid pipeline; the piezoelectric ceramic piece is connected to the other end of the transmission spring so as to receive vibration generated by the fluid pipeline and generate a current signal set based on the vibration; the first filter is electrically connected with the piezoelectric ceramic piece and is used for filtering current signals which are greater than or equal to a first preset frequency in the current signal set; and the alarm is electrically connected with the first filter and generates an alarm signal when receiving the current signal smaller than the first preset frequency. The invention further discloses an early warning method corresponding to the early warning system. Potential safety hazards existing in the operation process of the power generation equipment are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment, and in particular to an early warning method and system for expansion of a fluid pipeline of a boiler. Background Art

[0002] During operation, boiler fluid piping (such as steam or water pipes) in power plants can expand due to the effects of temperature and pressure. Excessive expansion can cause equipment damage, leakage, explosion, and other safety hazards. Excessive pipe expansion can not only cause safety hazards but also impose additional load and wear on power generation equipment, increasing operating and maintenance costs. Summary of the Invention

[0003] The main purpose of the present invention is to provide an early warning method and system for fluid pipeline expansion, thereby reducing safety hazards in the operation of power generation equipment.

[0004] To achieve the above objectives, one aspect of the present invention provides an early warning system for fluid pipeline expansion, the system comprising:

[0005] a transmission spring, one end of which is connected to the fluid pipeline and is used to transmit vibration generated by the fluid pipeline;

[0006] a piezoelectric ceramic piece connected to the other end of the transmission spring to receive vibrations generated by the fluid conduit and generate a current signal set based on the vibrations;

[0007] a first filter electrically connected to the piezoelectric ceramic sheet and configured to filter current signals having a frequency greater than or equal to a first preset frequency;

[0008] The alarm is electrically connected to the first filter, and generates an alarm signal when the alarm receives a current signal with a frequency lower than a first preset frequency.

[0009] Preferably, the first filter is an active filter.

[0010] Optionally, the system further includes a second filter, one end of the second filter being electrically connected to the piezoelectric ceramic piece, and the other end of the second filter being electrically connected to the first filter, and the second filter being used to filter current signals in the current signal set that are greater than a second preset frequency.

[0011] Furthermore, the value of the second preset frequency is greater than or equal to 1 Hz.

[0012] Furthermore, the second filter is a low-pass filter.

[0013] Optionally, the system further includes a transformer, one end of the transformer is electrically connected to the piezoelectric ceramic sheet, and the other end of the transformer is electrically connected to the first filter, and the transformer is used to amplify the signal strength of the current signal set.

[0014] Another aspect of the present invention provides an early warning method for fluid pipeline expansion, the method comprising:

[0015] Connecting the fluid pipeline and the piezoelectric ceramic piece via a transmission spring to obtain a current signal set corresponding to the vibration of the fluid pipeline;

[0016] filtering the current signals in the current signal set that are greater than or equal to a first preset frequency;

[0017] If a current signal with a frequency less than the first preset frequency is detected after filtering, an alarm signal is generated.

[0018] Optionally, before filtering the current signals having a frequency greater than a first preset frequency in the current signal set, the method further includes:

[0019] The current signals having a frequency greater than a second preset frequency in the current signal set are filtered.

[0020] Furthermore, the value of the second preset frequency is greater than or equal to 1 Hz.

[0021] Optionally, before filtering the current signals having a frequency greater than a first preset frequency in the current signal set, the method further includes:

[0022] Amplify the signal strength of the current signal set.

[0023] The beneficial effects of the technical solution of the present invention are:

[0024] By using a transmission spring to convert the vibration of the fluid pipeline into an electric current signal, the expansion state of the fluid pipeline can be monitored in real time, facilitating safe maintenance of power generation equipment. Furthermore, the simple structure of the early warning system effectively reduces system maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A circuit diagram of an early warning system according to an embodiment of the present invention;

[0026] Figure 2 Flowchart of the early warning method according to an embodiment of the present invention.

[0027] Description of Figure Numbers:

[0028] Piezoelectric ceramic plate 100; first filter 200; alarm 300; second filter 400; transformer 500.

[0029] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings to clearly and completely describe the solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0031] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element.

[0032] In addition, the descriptions involving "first", "second", etc. in the embodiments of the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features.

[0033] In order to address the technical deficiencies in the related art, this embodiment provides an early warning system for fluid pipeline expansion. The early warning system of this embodiment includes a transmission spring, a piezoelectric ceramic sheet 100, a first filter 200, and an alarm 300.

[0034] One end of the transmission spring is connected to the fluid pipeline, and the other end is connected to the piezoelectric ceramic plate 100. This allows the transmission spring to transmit the vibrations generated by the fluid pipeline to the piezoelectric ceramic plate 100. The piezoelectric ceramic plate 100 is made of a piezoelectric ceramic material that exhibits a piezoelectric effect. Therefore, when the piezoelectric ceramic plate 100 receives the vibrations generated by the fluid pipeline through the transmission spring, it generates a current signal set based on the vibrations.

[0035] like Figure 1 As shown, the first filter 200 is electrically connected to the piezoelectric ceramic plate 100 and is used to filter out current signals greater than or equal to the first preset frequency in the current signal concentration. It should be noted that during operation, the fluid pipeline not only has its own expansion vibration caused by the internal fluid temperature, but also has interference vibration caused by the internal fluid flow. Therefore, the current signal concentration generated by the piezoelectric ceramic plate 100 includes not only the expansion signal caused by the expansion of the fluid pipeline itself, but also the interference signal caused by the fluid in the pipeline. Therefore, in order to capture the expansion signal of the fluid pipeline, it is necessary to filter the interference signal. In this embodiment, the first preset frequency corresponds to the frequency of the interference signal, so the current signal remaining after filtering the current signal concentration greater than or equal to the first preset frequency is the expansion signal. The alarm 300 is electrically connected to the first filter 200. When the alarm 300 receives a current signal less than the first preset frequency, it generates an alarm signal, thereby notifying the staff that the fluid pipeline has expanded beyond the critical value.

[0036] It should be noted that the numerical setting of the first preset frequency is based on the actual working environment. The numerical value of the first preset frequency varies according to different working environments. For example, the numerical range of the first preset frequency is usually 0.1 Hz to 0.5 Hz.

[0037] Preferably, the first filter 200 is an active filter.

[0038] Continue to refer to Figure 1 As shown, in some embodiments, the early warning system further includes a second filter 400. One end of the second filter 400 is electrically connected to the piezoelectric ceramic plate 100, and the other end of the second filter 400 is electrically connected to the first filter 200. The second filter 400 is used to filter current signals that are greater than a second preset frequency in the current signal concentration. The second preset frequency corresponds to the frequency of high-frequency interference signals caused by other surrounding devices. The value of the second preset frequency is greater than or equal to 1 Hz. Optionally, the second filter 400 is a low-pass filter.

[0039] Continue to refer to Figure 1 As shown, in some embodiments, the early warning system further includes a transformer 500, one end of which is electrically connected to the piezoelectric ceramic sheet 100, and the other end of the transformer 500 is electrically connected to the first filter 200. The transformer 500 is used to amplify the signal strength of the current signal set, thereby improving the ability to capture the expansion signal of the fluid pipeline.

[0040] In summary, the early warning system of this embodiment utilizes a transmission spring to convert the vibration of the fluid pipeline into an electrical current signal, thereby enabling real-time monitoring of the expansion state of the fluid pipeline, facilitating safe maintenance of power generation equipment. Furthermore, the early warning system's simple structure effectively reduces system maintenance costs.

[0041] like Figure 2 As shown, this embodiment also provides an early warning method for fluid pipeline expansion, which includes:

[0042] Step S1: Connect the fluid pipeline and the piezoelectric ceramic piece via a transmission spring to obtain a current signal set corresponding to the vibration of the fluid pipeline.

[0043] Step S2: filtering the current signals having a frequency greater than or equal to a first preset frequency in the current signal set.

[0044] Step S3: If a current signal with a frequency less than the first preset frequency is detected after filtering, an alarm signal is generated.

[0045] During operation, the fluid pipeline not only experiences its own expansion vibrations due to the internal fluid temperature, but also interference vibrations caused by the internal fluid flow. Therefore, the current signal generated by the piezoelectric ceramic includes not only the expansion signal caused by the expansion of the fluid pipeline itself, but also the interference signal caused by the fluid within the pipeline. Therefore, in order to capture the expansion signal of the fluid pipeline, it is necessary to filter out the interference signal. In this embodiment, the first preset frequency corresponds to the frequency of the interference signal. Therefore, after filtering the current signal concentration with current signals greater than or equal to the first preset frequency, the current signal remaining is the expansion signal.

[0046] Furthermore, in order to further reduce interference signals, the following steps may be included before step S2:

[0047] Step S1a: filtering the current signals in the current signal set that have a frequency greater than a second preset frequency, wherein the second preset frequency is greater than or equal to 1 Hz.

[0048] Furthermore, in order to easily capture the expansion signal, the following steps may be included before step S2:

[0049] Step S1b: amplify the signal strength of the current signal set.

[0050] Of course, according to actual needs, step S1a and step S1b may be executed in sequence after step S1.

[0051] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. Any equivalent structural transformation made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields, is included in the scope of protection of the present invention.

Claims

1. An early warning system for fluid pipeline expansion, characterized in that: include: a transmission spring, one end of which is connected to the fluid pipeline and is used to transmit vibration generated by the fluid pipeline; a piezoelectric ceramic piece connected to the other end of the transmission spring to receive the vibration generated by the fluid conduit and generate a current signal set based on the vibration; a first filter, electrically connected to the piezoelectric ceramic sheet, for filtering current signals having a frequency greater than or equal to a first preset frequency in the current signal concentration; An alarm is electrically connected to the first filter, and generates an alarm signal when the alarm receives a current signal with a frequency lower than the first preset frequency.

2. The early warning system for fluid pipeline expansion according to claim 1, characterized in that: The first filter is an active filter.

3. The early warning system for fluid pipeline expansion according to claim 1, characterized in that: It also includes a second filter, one end of which is electrically connected to the piezoelectric ceramic piece, and the other end of the second filter is electrically connected to the first filter, and the second filter is used to filter the current signals in the current signal concentration that are greater than a second preset frequency.

4. The early warning system for fluid pipeline expansion according to claim 3, characterized in that: The second preset frequency is greater than or equal to 1 Hz.

5. The early warning system for fluid pipeline expansion according to claim 4, characterized in that: The second filter is a low-pass filter.

6. The early warning system for fluid pipeline expansion according to claim 1, characterized in that: It also includes a transformer, one end of which is electrically connected to the piezoelectric ceramic sheet, and the other end of which is electrically connected to the first filter, and the transformer is used to amplify the signal strength of the current signal set.

7. A method for early warning of fluid pipeline expansion, characterized in that: include: connecting the fluid pipeline and the piezoelectric ceramic piece via a transmission spring to obtain a current signal set corresponding to the vibration of the fluid pipeline; filtering the current signals having a frequency greater than or equal to a first preset frequency in the current signal set; If a current signal with a frequency less than the first preset frequency is detected after filtering, an alarm signal is generated.

8. The early warning method for fluid pipeline expansion according to claim 7, characterized in that: Before filtering the current signals in the current signal set that are greater than the first preset frequency, the method further includes: The current signals having a frequency greater than a second preset frequency in the current signal set are filtered.

9. The early warning method for fluid pipeline expansion according to claim 8, characterized in that: The second preset frequency is greater than or equal to 1 Hz.

10. The early warning method for fluid pipeline expansion according to claim 8, characterized in that: Before filtering the current signals in the current signal set that are greater than the first preset frequency, the method further includes: Amplifying the signal strength of the current signal set.

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