CN109915739B - Submarine pipeline leakage detection system based on jetting noise - Google Patents
Submarine pipeline leakage detection system based on jetting noise Download PDFInfo
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Abstract
A submarine pipeline leakage detection system based on jet noise, wherein a jet noise signal is transmitted to a signal processing system; the signal output port of the signal processing system is connected with the signal input port of the single chip microcomputer control system and used for processing the signals transmitted by the signal processing system; a signal output port of the mileage positioning system is connected with a signal input port of the single chip microcomputer control system, so that the origin of the jetting noise generated by leakage can be positioned; the alarm signal output port of the singlechip control system is connected with the input port of the alarm system, and the alarm system gives an alarm when the sensor system detects an insufflating noise signal; and the display port of the singlechip control system is connected with the input port of the display system and is used for displaying the position of the jetting noise origin. The invention carries out the leakage detection of the pipeline based on the processing and analysis of the collected jetting noise signal, can realize the analysis and the processing of the leakage data of the submarine pipeline and prevent the occurrence of the production accidents of the submarine pipeline.
Description
Technical Field
The invention relates to a submarine pipeline leakage detection system based on jetting noise, and belongs to the technical field of nondestructive testing. The method can realize the analysis and the processing of the leakage data of the submarine pipeline and prevent the occurrence of the production accidents of the submarine pipeline.
Background
The safe production of submarine pipelines faces more severe challenges than terrestrial pipelines, and in addition to the defects of the traditional pipelines, the pipelines can also generate various deformations such as drifting, sinking, reverse bending and the like to cause stress concentration and hidden damage of pipeline strength due to various complex reasons.
The detection device in the seabed long-distance pipeline can carry geometric diameter-changing, stress, injection and pipeline positioning detection devices. The method utilizes the principle of non-destructive injection detection, takes a pipeline conveying medium as power, and travels in the pipeline to finish the non-destructive detection of the long-distance pipeline body, thereby realizing the on-line detection of the defects of the long-distance pipeline body, the changes of the pipeline wall, the changes of the material and the identification of the pipeline characteristics (such as a pipe hoop, a scar, an elbow, a welding line, a tee joint and the like). And scientific basis is provided for operation, maintenance, safety and evaluation of pipelines.
When the pipeline leaks, due to the pressure difference between the inside and the outside of the pipeline, fluid in the pipeline forms high-speed jet flow outwards from the leakage position to form jetting noise, and theoretically, the main sound source of the jetting noise generated by leakage is generated by vortex carried by jet flow. The leakage noise is mainly caused by turbulence disturbance caused by high-speed jet flow caused by pressure difference between the inside and the outside of the pipeline, and the sound source is concentrated near a leakage opening in the pipeline and is positioned in the pipeline, so that the leakage noise can be generated as long as leakage occurs, and the medium outside the pipeline is liquid or gas regardless of a single-layer pipe or a double-layer pipe; the system performs leakage detection of the pipeline based on processing analysis of the acquired injection noise.
Disclosure of Invention
According to the defects of the prior art, the method and the device carry out the leakage detection of the pipeline based on the processing and analysis of the collected injection noise signal, can realize the analysis and the processing of the leakage data of the submarine pipeline, and prevent the occurrence of the production accident of the submarine pipeline.
In order to achieve the purpose, the invention is realized according to the following technical scheme:
a submarine pipeline leakage detection system based on jet noise comprises a single chip microcomputer control system, a sensor system, a signal processing system, a mileage positioning system, an alarm system and a display system; the signal output port of the sensor system is connected with the signal input port of the signal processing system and is used for transmitting the detected jet noise signal to the signal processing system; the signal output port of the signal processing system is connected with the signal input port of the single chip microcomputer control system and is used for processing the signals transmitted by the signal processing system; the signal output port of the mileage positioning system is connected with the signal input port of the single chip microcomputer control system and used for positioning an injection noise origin place generated by leakage; the alarm signal output port of the singlechip control system is connected with the input port of the alarm system, and the alarm system gives an alarm when the sensor system detects an insufflating noise signal; and the display port of the singlechip control system is connected with the input port of the display system and is used for displaying the position of the jetting noise origin.
Further, the sensor system comprises a hydrophone, a charge-voltage conversion circuit, an amplifying circuit and a band-pass filter circuit; the hydrophone is connected with the charge-voltage conversion circuit and used for amplifying the charge signals generated by the hydrophone and then converting the amplified charge signals into voltage signals, the charge-voltage conversion circuit is connected with the amplifying circuit and used for amplifying the converted voltage signals again, and the amplifying circuit is connected with the band-pass filter circuit.
Furthermore, the signal processing system adopts an FPGA chip as a central controller to complete front-end multichannel A/D data acquisition, SPI bus transmission, real-time compression after CPU reading, and storage to an ATA hard disk through an IDE interface after compression
Further, the mileage positioning system comprises an inertia sensitive element and a mileage gauge, wherein the inertia sensitive element comprises a gyroscope and an accelerometer; the mileage positioning system is installed in the submarine pipeline leakage detection system, collects data of the three-way gyroscope, the three-way accelerometer and the three-way odometer at a certain frequency, stores the data in the storage equipment, is used for off-line calculation after the fact, and accurately positions a pipeline fault point by combining a pipeline fault detection signal.
Further, the single chip microcomputer control system adopts an 80C51 chip.
Further, the display system comprises an 8255 chip, eight reverse drivers, two reverse drivers and two LED displays; the P0 port of the 80C51 chip is connected with the data port of the 8255 chip for data transmission, the P0 port and the P2 port are connected with the CS chip selection pin of the 8255 chip through a decoding circuit for chip selection, and the 'read' and 'write' pins are correspondingly connected; the PB port of the 8255 chip is connected with the segment control ports of the two LED displays through eight reverse drivers respectively, the PC0 port of the 8255 chip is connected with the position control port of the 'unit' LED display through two reverse drivers, and the PC1 port of the 8255 chip is connected with the position control port of the 'ten-position' LED display through two reverse drivers.
Further, the alarm system comprises a buzzer, the positive terminal of the buzzer is respectively connected with one end of a resistor R1, one end of a resistor R2 and a power supply VCC, the other end of the resistor R1 is connected with 3 pins of an 80C51 chip through a green LED, and the other end of the resistor R2 is connected with 4 pins of the 80C51 chip through a red LED; the negative electrode end of the buzzer is connected with the collector of an NPN triode Q1, the emitter of the NPN triode Q1 is grounded, and the base of the NPN triode Q1 is connected with the 5 th pin of the 80C51 chip through a resistor R3.
The invention has the beneficial effects that:
the invention carries out the leakage detection of the pipeline based on the processing and analysis of the collected jetting noise signal, can realize the analysis and the processing of the leakage data of the submarine pipeline and prevent the occurrence of the production accidents of the submarine pipeline.
Drawings
FIG. 1 is a control diagram of a subsea pipeline leak detection system of the present invention;
FIG. 2 is a diagram of a sensor system of the present invention;
FIG. 3 is a diagram of a signal conditioning system of the present invention;
FIG. 4 is a diagram of a mileage positioning system of the present invention;
FIG. 5 is a diagram of a display system of the present invention;
fig. 6 is a diagram of an alarm system of the present invention.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the system for detecting the leakage of the submarine pipeline based on the insufflating noise comprises a single-chip microcomputer control system 10, a sensor system 20, a signal processing system 30, a mileage positioning system 40, an alarm system 50 and a display system 60; the signal output port of the sensor system 20 is connected with the signal input port of the signal processing system 30, and is used for transmitting the detected insufflating noise signal to the signal processing system 30; the signal output port of the signal processing system 30 is connected to the signal input port of the single chip microcomputer control system 10, and is used for processing the signal transmitted by the signal processing system 30; a signal output port of the mileage positioning system 40 is connected with a signal input port of the singlechip control system 10, so as to position an origin of the injection noise generated by leakage; an alarm signal output port of the singlechip control system 10 is connected with an input port of the alarm system 50, and when the sensor system 20 detects an insufflating noise signal, the alarm system 50 sends an alarm; the display port of the singlechip control system 10 is connected with the input port of the display system 60 and is used for displaying the position of the origin of the insufflating noise.
As shown in fig. 2, a pressure-resistant hydrophone working in a liquid environment is selected in the sensor system, and since the hydrophone directly outputs a signal which is a charge, weak and difficult to directly measure, the signal needs to be converted into a voltage signal and appropriately amplified. In addition, it is necessary to filter out a signal in a frequency band range not necessary for detecting leakage, and only a useful signal in a frequency band range including the leakage signal is retained, which requires a circuit having a filtering function. Meanwhile, the circuit has a good signal-to-noise ratio, and the measurement accuracy is guaranteed. The first stage of the circuit is a charge-voltage conversion circuit, weak charge signals are properly amplified to generate voltage, and the frequency range of the signals is 0.7 Hz-1000 KHz calculated according to the capacitance value of the hydrophone and the resistance value of the first stage circuit. The second stage is an amplifying circuit which amplifies the converted voltage signal, and the amplification times are 5 times, 10 times, 50 times and 100 times, and can be selected, wherein the selection of the amplification times is realized by a dial switch. A band-pass filter circuit is arranged behind the sensor, and the filter pass band is designed to be 20-20kHz according to the frequency bands of the input signals and the noise of the sensor; to facilitate subsequent analog-to-digital conversion, the signal amplitude is raised with a 1.25V reference voltage. Through theoretical calculation, under the condition that the amplification factor is 100, the output noise generated by the circuit is 1.8mV, which is much smaller than the signal amplitude 19.44mV corresponding to the leakage detection sensitivity index of 0.1L/min. The circuit is powered by 5V voltage, and-5V voltage is generated by a MAX660 chip to supply power for each operational amplifier. The positive and negative 5V power supply part adopts pi-type filtering, so that voltage ripples are reduced.
As shown in fig. 3, the signal processing system uses a cycle II series FPGA chip of altera corporation as a central controller to complete front end multi-channel a/D data acquisition, SPI bus transmission, real-time compression after CPU reading, and storage to ATA hard disk through IDE interface after compression. The front-end A/D adopts a multi-chip multi-channel high-speed A/D to respectively sample hundreds of analog signals by a multi-path A/D control module at 1khz, and then serially reads out 12-bit sampling results. Control and data transfer is via a multiplexed SPI bus. The CPU for realizing real-time compression adopts an SOPC technology, an NIOS II soft core is embedded, an embedded system structure is constructed, a uclinux operating system is embedded, and a real-time lossless compression algorithm and a data acquisition program are compiled by utilizing the multithreading function and rich interface drive of the uclinux operating system. Two threads, namely a data acquisition thread and a data compression thread, are created by utilizing a pthread library function of uclinux, wherein the data acquisition thread mainly stores acquired data in a text form, and the data compression thread mainly compresses the acquired text. Because the two threads are both scheduled by the kernel of the uclinux, the real-time data acquisition and compression can be realized. And storing the compressed file on a hard disk, designing an IDE control module in the FPGA, and continuously storing data on the FAT32 hard disk format. And after the detection is finished, decompressing the compressed document and reading out the detection data.
As shown in fig. 4, the mileage positioning system includes an inertia sensor and a mileage meter, wherein the inertia sensor includes a gyroscope and an accelerometer; the mileage positioning system is installed in the submarine pipeline leakage detection system, collects data of the three-way gyroscope, the three-way accelerometer and the three-way odometer at a certain frequency, stores the data in the storage equipment, is used for off-line calculation after the fact, and accurately positions a pipeline fault point by combining a pipeline fault detection signal. The system comprises the following components: host computer, data download cable, data processing software. The data processing unit is used for data downloading and data processing functions and is mainly used for afterwards off-line navigation calculation. And performing integrated navigation calculation by using the inertial navigation data, the odometer data and the magnetic scale data, and providing all navigation information (information such as time, speed and position) in the whole process of running the carrier.
As shown in fig. 5, the display system includes 8255 chip, eight-way backward driver, two-way backward driver and two LED displays; the P0 port of the 80C51 chip is connected with the data port of the 8255 chip for data transmission, the P0 port and the P2 port are connected with the CS chip selection pin of the 8255 chip through a decoding circuit for chip selection, and the 'read' and 'write' pins are correspondingly connected; the PB port of the 8255 chip is connected with the segment control ports of the two LED displays through eight reverse drivers respectively, the PC0 port of the 8255 chip is connected with the position control port of the 'unit' LED display through two reverse drivers, and the PC1 port of the 8255 chip is connected with the position control port of the 'ten-position' LED display through two reverse drivers.
As shown in fig. 6, the alarm system includes a buzzer, a positive terminal of the buzzer is connected to one end of a resistor R1, one end of a resistor R2, and a power VCC, respectively, the other end of the resistor R1 is connected to pin 3 of an 80C51 chip through a green LED, and the other end of the resistor R2 is connected to pin 4 of the 80C51 chip through a red LED; the negative electrode end of the buzzer is connected with the collector of an NPN triode Q1, the emitter of the NPN triode Q1 is grounded, and the base of the NPN triode Q1 is connected with the 5 th pin of the 80C51 chip through a resistor R3.
The invention carries out the leakage detection of the pipeline based on the processing and analysis of the collected jetting noise signal, can realize the analysis and the processing of the leakage data of the submarine pipeline and prevent the occurrence of the production accidents of the submarine pipeline.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (5)
1. A submarine pipeline leakage detection system based on insufflating noise is characterized in that: the system comprises a singlechip control system, a sensor system, a signal processing system, a mileage positioning system, an alarm system and a display system;
the signal output port of the sensor system is connected with the signal input port of the signal processing system and is used for transmitting the detected jet noise signal to the signal processing system;
the signal output port of the signal processing system is connected with the signal input port of the single chip microcomputer control system and is used for processing the signals transmitted by the signal processing system;
the signal output port of the mileage positioning system is connected with the signal input port of the single chip microcomputer control system and used for positioning an injection noise origin place generated by leakage;
the alarm signal output port of the singlechip control system is connected with the input port of the alarm system, and the alarm system gives an alarm when the sensor system detects an insufflating noise signal;
the display port of the single chip microcomputer control system is connected with the input port of the display system and used for displaying the position of an insufflating noise origin;
the sensor system comprises a hydrophone, a charge-voltage conversion circuit, an amplifying circuit and a band-pass filter circuit;
the hydrophone is connected with the charge-voltage conversion circuit and used for amplifying the charge signal generated by the hydrophone and then converting the amplified charge signal into a voltage signal, the charge-voltage conversion circuit is connected with the amplifying circuit and used for amplifying the converted voltage signal again, and the amplifying circuit is connected with the band-pass filter circuit;
the mileage positioning system comprises an inertia sensitive element and a mileage meter, wherein the inertia sensitive element comprises a gyroscope and an accelerometer;
the mileage positioning system is installed in the submarine pipeline leakage detection system, collects data of the three-way gyroscope, the three-way accelerometer and the three-way odometer at a certain frequency, stores the data in the storage equipment, is used for off-line calculation after the fact, and accurately positions a pipeline fault point by combining a pipeline fault detection signal.
2. An insufflating noise based subsea pipeline leak detection system according to claim 1, characterized by: the signal processing system adopts an FPGA chip as a central controller to complete front-end multichannel A/D data acquisition and SPI bus transmission, and a CPU reads and then compresses in real time and stores the compressed data to an ATA hard disk through an IDE interface.
3. An insufflating noise based subsea pipeline leak detection system according to claim 1, characterized by: the single chip microcomputer control system adopts an 80C51 chip.
4. An insufflating noise based subsea pipeline leak detection system according to claim 3, characterized by: the display system comprises an 8255 chip, eight reverse drivers, two reverse drivers and two LED displays;
the P0 port of the 80C51 chip is connected with the data port of the 8255 chip for data transmission, the P0 port and the P2 port are connected with the CS chip selection pin of the 8255 chip through a decoding circuit for chip selection, and the 'read' and 'write' pins are correspondingly connected; the PB port of the 8255 chip is connected with the segment control ports of the two LED displays through eight reverse drivers respectively, the PC0 port of the 8255 chip is connected with the position control port of the 'unit' LED display through two reverse drivers, and the PC1 port of the 8255 chip is connected with the position control port of the 'ten-position' LED display through two reverse drivers.
5. An insufflating noise based subsea pipeline leak detection system according to claim 3, characterized by: the alarm system comprises a buzzer, the positive end of the buzzer is respectively connected with one end of a resistor R1, one end of a resistor R2 and a power supply VCC, the other end of the resistor R1 is connected with 3 pins of an 80C51 chip through a green LED, and the other end of the resistor R2 is connected with 4 pins of the 80C51 chip through a red LED; the negative electrode end of the buzzer is connected with the collector of an NPN triode Q1, the emitter of the NPN triode Q1 is grounded, and the base of the NPN triode Q1 is connected with the 5 th pin of the 80C51 chip through a resistor R3.
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Address after: No. 22, Chaoyangmen North Street, Chaoyang District, Beijing 100728 Patentee after: CHINA PETROLEUM & CHEMICAL Corp. Patentee after: State pipe network group east crude oil storage and Transportation Co.,Ltd. Patentee after: Pipe network group (Xuzhou) pipeline inspection and Testing Co.,Ltd. Address before: No. 22, Chaoyangmen North Street, Chaoyang District, Beijing 100728 Patentee before: CHINA PETROLEUM & CHEMICAL Corp. Patentee before: CHINA SINOPEC PIPELINE STORAGE AND TRANSPORTATION Co.,Ltd. Patentee before: SINOPEC LONG DISTANCE OIL AND GAS PIPELINES DETECTION Co.,Ltd. |
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Granted publication date: 20210105 |