CN217736952U - Pipeline leakage simulation detection system - Google Patents
Pipeline leakage simulation detection system Download PDFInfo
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- CN217736952U CN217736952U CN202221421889.7U CN202221421889U CN217736952U CN 217736952 U CN217736952 U CN 217736952U CN 202221421889 U CN202221421889 U CN 202221421889U CN 217736952 U CN217736952 U CN 217736952U
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Abstract
The utility model relates to a pipeline leakage detection technical field specifically relates to a pipeline leakage simulation detecting system. The utility model discloses set up simulation pipeline network to actual pipeline network, leaked the medium leakage that the device goes simulation actual pipeline network through the simulation on simulation pipeline network and leaked, the propagation parameter on the simulated pipeline after the medium leakage is calculated to medium leakage detection device when the medium leaks, and this parameter corresponds the propagation parameter of medium on actual pipeline. Therefore the utility model discloses a simulation detecting system provides the hardware support for the actual propagation parameter who obtains the medium, can prepare to calculate the medium leakage position based on the medium propagation parameter that this simulation detecting system provided.
Description
Technical Field
The utility model relates to a pipeline leakage detection technical field specifically relates to a pipeline leakage simulation detecting system.
Background
A plurality of pipelines are laid in cities and used for conveying gas required by life to urban residents, for example, a gas pipeline is used as an important infrastructure of the cities, and can continuously provide energy supply service for production and life of the urban residents. However, as the service time of the underground gas pipe network increases, and various external factors cause gas pipe leakage, the position of the gas leakage needs to be detected so that maintenance personnel can maintain the leaked gas pipe in time.
In summary, the prior art lacks a hardware system for acquiring propagation parameters.
Thus, there is a need for improvements and enhancements in the art.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a pipeline leakage simulation detecting system has solved prior art and has lacked the problem that is used for acquireing the required hardware system of propagation parameter.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a pipeline leakage simulation detecting system, wherein, including following component parts:
simulating a pipeline network;
the simulated leakage device is arranged on the simulated pipeline network;
the medium conveying device is connected to a medium inlet of the simulation pipeline network and used for conveying simulation media to the simulation pipeline network;
and the medium leakage detection device is arranged on the simulation pipeline network and is used for detecting the propagation parameters of the simulation medium after the simulation medium leaks in the simulation pipeline network.
In one implementation, the analog pipe network includes:
the pipe diameters of the simulation pipelines are different;
the control valve is arranged on the simulation pipeline and used for controlling the opening and closing state of the simulation pipeline;
and the simulated leakage hole is formed in the simulated pipeline.
In one implementation, the simulated leakage apparatus includes:
the proportional valve is arranged at the simulated leakage hole and used for adjusting the effective aperture of the simulated leakage hole;
and the flowmeter is arranged at the simulated leakage hole and used for detecting the leakage amount of the simulated medium at the simulated leakage hole.
In one implementation, the media transport device includes:
the air compressor is connected to a medium inlet of the simulation pipeline network and used for compressing the simulation medium into the simulation pipeline network;
the pressure regulating valve is arranged inside the simulation pipeline network and used for regulating the pressure of the simulation medium compressed into the simulation pipeline network;
and the valves are arranged at the medium inlet and the medium outlet of the simulation pipeline network.
In one implementation, the medium leakage detecting apparatus includes:
the medium leakage detector is arranged on the simulation pipeline network and used for detecting the leakage time of the simulation medium;
and the calculating unit is electrically connected with the medium leakage detector and used for calculating the leakage position of the simulation medium on the simulation pipeline network according to the leakage time.
In one implementation, the medium leakage detecting apparatus includes:
the pressure sensor is arranged on the simulation pipeline network;
and the acoustic wave sensor is arranged on the simulation pipeline network.
In one implementation, the pressure sensor is located inside the simulated piping network and the acoustic sensor is located on an outer wall of the simulated piping network.
In one implementation, the pressure sensor is arranged on the inner wall of the analog pipe network, and the position point of the pressure sensor on the inner wall of the analog pipe network and the position point of the acoustic wave sensor on the outer wall of the analog pipe network are the same position point.
In one implementation, the medium leakage detecting apparatus further includes:
and the data acquisition card is electrically connected with the pressure sensor, the sound wave sensor and the computing unit and is used for transmitting the pressure signal acquired by the pressure sensor and the sound wave signal acquired by the sound wave sensor to the computing unit.
In one implementation, the pressure sensors are located on both sides of a simulated leakage hole on the simulated piping network, and the acoustic sensors are located on both sides of the simulated leakage hole.
Has the advantages that: the utility model discloses set up the simulation pipeline network to actual pipeline network, leaked the medium leakage that the device goes the simulation actual pipeline network through the simulation on the simulation pipeline network and leaked, the propagation parameter on the simulation pipeline after the medium leaks is calculated to the medium leakage detection device when the medium leaks, and this parameter corresponds the propagation parameter of medium on actual pipeline. Therefore the utility model discloses a simulation detecting system provides the hardware support for the actual propagation parameter who obtains the medium, can prepare to calculate the medium leakage position based on the medium propagation parameter that this simulation detecting system provided.
Drawings
Fig. 1 is a schematic view of gas pipeline leakage in the embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and examples. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
A pipeline leakage simulation detection system comprises a simulation pipeline network, a simulation leakage device arranged on the simulation pipeline network, a medium conveying device used for conveying simulation media to the simulation pipeline network, and a medium leakage detection device used for detecting propagation parameters of the simulation media after the simulation media are leaked in the simulation pipeline network. These four parts are described below:
the simulation pipeline network comprises a plurality of simulation pipelines, control valves arranged on the simulation pipelines and simulation leakage holes arranged on the simulation pipelines.
In order to enable the simulation pipeline network to be matched with a real gas pipeline, in one embodiment, the simulation pipeline network is composed of three simulation pipelines with different diameters, and a certain gradient is integrally designed. The experiment of a pipe network system consisting of three pipelines is carried out by opening and closing control valves on different simulation pipelines, so that the leakage working conditions of long straight pipelines and complex annular pipe networks with different pipe diameters are simulated. The simulation pipeline network is that a pipeline network close to an actual pipeline is built, an experiment is carried out on the simulation pipeline network, the propagation speed of the gas simulation pipeline network is calculated, and when the gas leaks in the actual pipeline, the actual leakage position of the gas in the actual pipeline can be calculated by utilizing the propagation speed.
The simulated leakage device comprises a proportional valve arranged at the simulated leakage hole and a flowmeter arranged at the simulated leakage hole.
A leakage hole is formed in the wall of the simulation pipeline, a proportional valve and a flowmeter are installed on the leakage hole, the proportional valve simulates the leakage size by controlling the opening degree of the leakage hole (the effective aperture of the leakage hole for leaking fuel gas), the flowmeter measures the leakage amount, the leakage working conditions of leakage amounts of different grades such as micro-hole leakage and small-hole leakage are simulated, and the measurement accuracy of the pressure sensor and the sound pressure sensor on the leakage amounts of different grades is obtained by simulating the leakage amounts of the micro-hole leakage and the small-hole leakage. For example, some sensors have low measurement accuracy for leak holes with a hole diameter of less than 1mm, and if the hole diameter is required to be accurately measured even if the hole diameter is less than 1mm in actual measurement, the sensors with higher measurement accuracy need to be used instead.
The medium conveying device comprises an air compressor, a pressure regulating valve, valves arranged at a medium inlet and a medium outlet of the simulation pipeline network and a regeneration dryer.
The compressed air is used to replace fuel gas in the actual pipeline, and the pressure regulating valve is used to control and simulate the pressure grade of the conveying pipe network.
The air compressor compresses air outside the simulation pipeline into the simulation pipeline, then the dryer dries the compressed air (the drying process is carried out because the air contains moisture and the actually leaked fuel gas does not contain moisture, so the drying process can restore the real fuel gas leakage situation), and finally the pressure of the air is regulated by the pressure regulating valve. The circulation condition of the fuel gas in the actual pipeline is reduced by controlling the opening and closing of the valve.
The medium leakage detection device comprises a medium leakage detector consisting of a pressure sensor and an acoustic wave sensor, a calculation unit (computer), a pressure gauge (used for monitoring the gas pressure in the pipeline in real time), a pressure difference sensor (used for monitoring the pressure difference in the pipeline in real time), a high-precision dynamic signal data acquisition card and a general analog signal data acquisition card.
In one embodiment, the pressure sensor is a PH 101-M20 pressure sensor manufactured by Bingo instruments, inc., and this type of pressure sensor is chosen for the following reasons: the most important hardware devices for collecting sound wave and pressure signals are a sound wave sensor and a pressure sensor, and the signal collecting capacity of the two sensors directly influences the capacity of a collecting system. The frequency of pipe wall vibrations caused by pipe leaks is wide and ranges from infrasonic to ultrasonic. Therefore, it is appropriate to select an acceleration sensor as a sensing element for detecting leakage vibration. Considering the factors of small gas leakage vibration, wide frequency band and the like, the pressure sensor has certain stability and anti-interference capability and simultaneously meets the requirements of high precision and high sampling rate by selecting the piezoelectric accelerometer sensor and adopting the RS-2A series developed by the Beijing software island era science and technology Limited company.
In one embodiment, the acoustic wave sensor is a model RS-2A series sensor.
In one embodiment, the number of pressure sensors is two and the number of acoustic wave sensors is also two. Two pressure sensor movable installs on the inner wall of pipeline, and two acoustic sensor movable installs on the outer wall of pipeline, and pressure sensor and acoustic sensor are located the same position department of pipeline.
In one embodiment, the pressure sensor transmits the collected pressure signal to the computer through a general analog signal data acquisition card, and the sound wave sensor transmits the collected sound wave signal to the computer through the general analog signal data acquisition card. The universal analog signal data acquisition card used by the pressure sensor is a USB9219 type acquisition card produced by NI company, and is mainly characterized in that:
(1) NI9219 is isolated among channels, can measure multiple signals of sensor, such as strainometer, RTD, thermocouple, load cell and other power supply type sensors;
(2) 4 24-bit analog-to-digital converters (ADC) can realize synchronous sampling of 4 analog input channels;
(3) The NI9219 enables the excitation circuit for all input modes requiring excitation, and the voltage and current ranges are respectively +/-60V and +/-25 mA;
(4) NI9219 may reconfigure the signal conditioning for each measurement type.
The universal analog signal data acquisition card used by the acoustic wave sensor is a USB9234 type acquisition card produced by NI company for acquiring acoustic wave signals, and is mainly characterized in that:
(1) The USB9234 acquisition card has 4 analog signal input ports, and the 4 input ports can synchronously sample, so that the USB9234 acquisition card has certain advantages in the aspect of leakage detection;
(2) 16bit precision, the highest sampling frequency of 51.2kS/s/ch, the analog signal voltage input range of-5 to 5V and the adjustable voltage input range;
(3) The analog signal input port adopts a standard BNC connector, which is convenient for signal transmission, and the output adopts a widely used USB bus interface, which is convenient for connection with a computer system;
(4) And a perfect driver is attached randomly, especially, seamless connection with LabVIEW (virtual instrument software LabVIEW) of NI company can be realized, and the development efficiency of the application program is greatly improved.
The working process of the medium leakage detection device is as follows:
as shown in FIG. 1, when two pressure sensors are respectively at t 1 Time sum t 2 Sensing the pressure change at the position (the pressure change indicates that a leakage point exists on the pipeline) by the time, and sending t 1 And t 2 The method is transmitted into a computer, and the computer performs the calculation of the following formula according to an internal program:
wherein L is the distance between two pressure sensors arranged before the upstream and the downstream of the gas pipeline; x is a radical of a fluorine atom 1 、x 2 The distances between the leakage point and the upstream and downstream sensors are respectively; t is t 1 、t 2 Respectively the time for the pressure signal generated by the leakage point to propagate to the upstream and downstream sensors; v is the propagation velocity of the pressure signal in the gas pipeline; at is the time difference between the same pressure signal propagating to the upstream and downstream sensors. The gas pipeline leakage location can be calculated by the formula:
x to be calculated 1 And x 2 Distance x 'between simulated leakage hole arranged on pipeline and pressure sensor during simulation' 1 、x′ 2 Comparing, if not, adjusting v value until x is calculated 1 、x 2 Are respectively substituted with x' 1 、x′ 2 The same, value of v this moment is exactly corresponding to the real propagation velocity of gas in the pipeline when taking place the gas and leaking, through the utility model discloses a after the value of the propagation velocity v when the simulator calculates the gas and leaks, just can utilize the value of this v to calculate the actual position of leaking when actually taking place the gas and leaking.
Similarly, for the acoustic wave sensor, the propagation speed of the acoustic wave caused by gas leakage is calculated by adopting the principle, and only the distance between the two acoustic wave sensors needs to be replaced by L, and the time difference when the two acoustic wave sensors sense the acoustic wave needs to be replaced by delta t.
In this embodiment, the pressure sensor and the acoustic wave sensor are used to simulate and measure the position of the leakage point, the calculated position of the leakage point is compared with the actual position, and the propagation speed is adjusted according to the comparison result, based on the following principle:
when the gas pipeline leaks, the gas in the pipeline is ejected at a high speed at a leakage point due to the existence of huge pressure difference between the pipeline and the atmosphere, and strong vortex pulsation and high-speed jet flow can be generated near a leakage hole to cause higher local pressure gradient. This pressure gradient is manifested in two ways: one is that because of the continuity of the fluid, the velocity of the fluid in the pipe does not change immediately, and the pressure of the fluid varies between the leak and the adjacent areas, which causes the high pressure fluid in the area upstream and downstream of the leak to flow to the low pressure area at the leak, creating a strong pressure disturbance with a fixed pattern. And secondly, gas flows out from the leakage point and rubs with the pipe wall to generate sound wave oscillation, and the leakage sound wave signal shows that pressure drop takes the leakage point as the center and sound velocity is quickly transmitted to the upstream and the downstream of the pipeline along the outer wall of the pipeline.
The pressure sensors (located inside the pipeline) installed at the two ends of the pipe section can monitor and capture transient pressure signals transmitted to the inside of the pipe, and the sound wave sensor installed on the outer wall of the pipe section can monitor and capture sound wave signals transmitted to the pipe wall. By signal receiving and processing of a signal sensor, preposed signal amplification processing, filtering processing, digital-to-analog conversion, information interaction and the like, the time-frequency characteristic quantity of sound and pressure signals can be extracted to judge whether the pipeline leaks, and meanwhile, the leakage position of the pipeline is calculated according to the time difference of capturing the same leakage signal at two ends of the pipeline and the propagation speed of the signal.
The overall working process of the pipeline leakage simulation detection system in the embodiment is as follows:
when the simulation system works, compressed air is provided by the air compressor and the regenerative dryer, the compressed air is input into a simulated gas conveying pipe network, air media respectively enter leakage simulation pipelines with different pipe diameters by opening and closing control valves on different pipelines, and proportional valves on the control pipelines adjust the opening of leakage holes to carry out an experiment for simulating leakage working conditions under different leakage hole diameters. When the pipeline leaks, an acoustic signal is generated, and the pressure drop is caused at the leaking position to form a pressure signal. The pressure signal has instantaneous pressure drop, the sound intensity of the sound wave signal has instantaneous rise, and the rise and the fall of the two signals become the obvious characteristics of pipeline leakage. Signals are captured through the acoustic wave sensors, the pressure sensors and the like which are arranged at the two ends of the pipeline, and different signal characteristic quantities are obtained according to computer processing, and the deviation change when the pipeline leaks is interactively fed back, so that the pipeline leakage is positioned. In order to test and calibrate the position of the leakage point, an experimental scheme for acquiring and analyzing the sound wave signal of the pipeline leakage is established by changing the pipeline pressure, the arrangement position of the sensor and the leakage aperture. The distance between the positions of the upstream sensor and the downstream sensor arranged on the first group of pipelines is 5m from the leakage hole, the diameter of the leakage hole is 2mm, the medium pressure of the pipelines is 0.2-1.0 MPa, the pressure regulation variation amplitude is 0.2MPa, and the number of groups of finished experiments is 5. The distance between the positions of the upstream sensor and the downstream sensor arranged on the second group of pipelines is 10m, the diameter of the leakage hole is 2mm, the medium pressure of the pipelines is 0.2-1.0 MPa, the pressure regulation variation amplitude is 0.2MPa, and the number of the groups of finished experiments is 5. The distance between the positions of the upstream sensor and the downstream sensor arranged on the third group of pipelines is 5m, the diameter of the leakage hole is 1mm, the medium pressure of the pipelines is 0.2-1.0 MPa, the pressure regulation change amplitude is 0.2MPa, and the number of the groups of finished experiments is 5. According to the comparison between the three groups of distance measurement results of the device and the actual position of the leakage hole, the propagation speed of the sound pressure signal in the gas pipeline is adjusted until the leakage position calculated by adopting the adjusted propagation speed is matched with the simulated leakage position marked on the pipeline, and the propagation speed at the moment can be used for actually calculating the leakage position. In one embodiment, the propagation speed of the sound pressure signal in the gas pipeline and the time difference of the same sound pressure signal propagating to the upstream and downstream sensors are adjusted according to the comparison between the three sets of distance measurement results of the device and the actual position of the leakage hole, so as to achieve the optimal positioning effect.
To sum up, the utility model discloses set up the simulation pipeline network to actual pipeline network, leaked the medium leakage that the device goes the simulation actual pipeline network through the simulation on the simulation pipeline network, the propagation parameter on the simulation pipeline after the medium leakage is calculated to medium leakage detection device when the medium leaks, and this parameter corresponds the propagation parameter of medium on actual pipeline. Therefore the utility model discloses a simulation detecting system provides the hardware support for the actual propagation parameter who obtains the medium, can prepare to calculate the medium leakage position based on the medium propagation parameter that this simulation detecting system provided.
Additionally the utility model discloses two kinds of signals (pressure signal and sound wave signal) mutual discernment leak the operating mode, solve the signal identification's of single pressure ripples or sound wave method limitation, avoid the real-time of negative pressure ripples method to a certain extent, after missing the leakage pressure drop in the twinkling of an eye, whether dynamic pressure fluctuation and sound wave signal can detect the leakage equally and take place. Meanwhile, two sensors are adopted to detect that two leakage signals reach the same leakage detection point at the same position, so that the time synchronization of multi-point positioning is avoided, the errors caused by signal transmission delay and the like are avoided to a certain extent by single-point positioning, and the leakage position is directly determined on the terminal, so that the quick response time and the accurate detection precision are realized. The two sensors are adopted to detect leakage information capable of being collected in the pipeline and on the pipeline wall, multi-information fusion processing of dynamic pressure fluctuation signals and sound wave signals is realized, the pressure measurement system and the sound wave measurement system are mutually backed up, and a double-channel detection mode has better reliability and higher precision
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A pipeline leakage simulation detection system is characterized by comprising the following components:
simulating a pipeline network;
the simulated leakage device is arranged on the simulated pipeline network;
the medium conveying device is connected to a medium inlet of the simulation pipeline network and used for conveying simulation media to the simulation pipeline network;
and the medium leakage detection device is arranged on the simulation pipeline network and is used for detecting the propagation parameters of the simulation medium after the simulation medium leaks in the simulation pipeline network.
2. The pipeline leak simulation detection system of claim 1, wherein the simulated pipeline network comprises:
the pipe diameters of the simulation pipelines are different;
the control valve is arranged on the simulation pipeline and used for controlling the opening and closing state of the simulation pipeline;
and the simulated leakage hole is formed in the simulated pipeline.
3. The pipeline leak simulation test system as set forth in claim 2, wherein said simulated leak device comprises:
the proportional valve is arranged at the simulated leakage hole and used for adjusting the effective aperture of the simulated leakage hole;
and the flowmeter is arranged at the simulated leakage hole and used for detecting the leakage amount of the simulated medium at the simulated leakage hole.
4. The pipe leak simulation test system of claim 1, wherein the media transport device comprises:
the air compressor is connected to a medium inlet of the simulation pipeline network and used for compressing the simulation medium into the simulation pipeline network;
the pressure regulating valve is arranged inside the simulation pipeline network and used for regulating the pressure of the simulation medium compressed into the simulation pipeline network;
and the valves are arranged at the medium inlet and the medium outlet of the simulation pipeline network.
5. The pipe leak simulation test system of claim 1, wherein the medium leak test device comprises:
the medium leakage detector is arranged on the simulation pipeline network and is used for detecting the leakage time of the simulation medium;
and the calculation unit is electrically connected with the medium leakage detector and is used for calculating the leakage position of the simulation medium on the simulation pipeline network according to the leakage time.
6. The pipe leak simulation test system of claim 5, wherein the medium leak test device comprises:
the pressure sensor is arranged on the simulation pipeline network;
and the acoustic wave sensor is arranged on the simulation pipeline network.
7. The pipe leak analog detection system of claim 6, wherein said pressure sensor is located inside said analog pipe network and said acoustic wave sensor is located on an outer wall of said analog pipe network.
8. The pipe leak simulation test system of claim 7, wherein said pressure sensor is positioned on an inner wall of said simulated pipe network, and wherein a point of said pressure sensor on said inner wall of said simulated pipe network is the same point of said acoustic sensor on an outer wall of said simulated pipe network.
9. The pipe leak simulation test system of claim 6, wherein the medium leak test device further comprises:
and the data acquisition card is electrically connected with the pressure sensor, the sound wave sensor and the computing unit and is used for transmitting the pressure signal acquired by the pressure sensor and the sound wave signal acquired by the sound wave sensor to the computing unit.
10. The simulated piping leakage detection system of claim 6 wherein said pressure sensors are located on said simulated piping network on opposite sides of a simulated leakage hole and said acoustic wave sensors are located on opposite sides of said simulated leakage hole.
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| CN202221421889.7U CN217736952U (en) | 2022-06-08 | 2022-06-08 | Pipeline leakage simulation detection system |
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| CN202221421889.7U CN217736952U (en) | 2022-06-08 | 2022-06-08 | Pipeline leakage simulation detection system |
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