CN114383054A - Pipe gallery gas pipeline leakage experiment system and method - Google Patents
Pipe gallery gas pipeline leakage experiment system and method Download PDFInfo
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- CN114383054A CN114383054A CN202110112913.2A CN202110112913A CN114383054A CN 114383054 A CN114383054 A CN 114383054A CN 202110112913 A CN202110112913 A CN 202110112913A CN 114383054 A CN114383054 A CN 114383054A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
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- General Engineering & Computer Science (AREA)
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Abstract
The invention relates to an experimental system and method for piping lane gas pipeline leakage, which is characterized in that the structure of a piping lane gas pipeline and a gas leakage process are simulated by building an experimental system for the piping lane gas pipeline leakage, sound waves of the gas leakage to the leakage conversion process are monitored and analyzed, the change rule of gas flow velocity along with the speed under different working conditions is detected, each acoustic physical parameter of the pipeline gas leakage process is contrasted and analyzed, the distribution characteristics of sound wave signals in a time domain, a frequency domain and a space domain are obtained, the sensitive parameters for judging the position of a leakage field source are obtained through the sound field and temperature field characteristics in an air medium before and after the gas pipeline leakage, the judgment standard of the leakage point is summarized, and the identification rate and the precision of the tracing and positioning are improved.
Description
Technical Field
The invention relates to the technical field of underground pipe gallery safety monitoring, in particular to an experimental system and method for gas pipeline leakage of a pipe gallery.
Background
The utility tunnel construction site is narrow and small and the construction is comparatively complicated, and the inspection of the underground piping of ubiquitous, maintenance scheduling problem awaits measuring urgently. As the fuel gas belongs to a special type of transmission medium, the fire hazard characteristics of natural gas are class A, the explosion limit is very low, the fuel gas belongs to flammable and explosive hazardous gas, and malignant events such as explosion, fire hazard and the like which harm urban public safety are easily caused to cause adverse effects.
After the gas pipeline enters the utility tunnel, the gas pipeline is laid and in the use process, the gas pipeline causes gas leakage due to construction, corrosion, artificial damage and other reasons, and more factors restricting maintenance exist. One is toxic gas escaping from the gas pipeline, and poisoning may occur when overhauling and maintaining personnel inspects and overhauls in the comprehensive pipe rack. Another kind of harm, because the existence of cable in the utility tunnel, spark can appear, and when reaching certain degree that gas and air mix, meet the spark, can catch fire and arouse the explosion, cause very big injury to public safety.
The leaked fuel gas is mixed with air in a limited space to reach the explosion limit, and then explosion is easily caused, so that adverse effects are caused. If the pipeline leakage position can be found in time and processed in the early stage of pipeline leakage, the loss and the influence can be reduced to the maximum extent. Particularly, in the present day of high-speed urbanization, the environment for urban pipeline exploration is increasingly harsh.
Disclosure of Invention
Based on the above situation in the prior art, the invention aims to provide an experimental system and method for piping lane gas pipeline leakage, which realize physical simulation of the underground comprehensive piping lane gas pipeline gas leakage process by building an experimental system for piping lane gas pipeline leakage so as to accurately analyze various parameters of piping lane gas pipeline leakage.
In order to achieve the above object, according to one aspect of the present invention, there is provided an experimental system for pipe gallery gas pipeline leakage, comprising a main gas path device and a sound wave experimental device; wherein the content of the first and second substances,
the main gas circuit device simulates the structure of a gas pipeline of a pipe gallery;
the sound wave experimental device is connected with the main gas circuit device, a gas leakage process is simulated in a pipe gallery gas pipeline simulated by the main gas circuit device, and the sound wave of the gas leakage to the leakage conversion process is monitored and analyzed.
Furthermore, the main air path device comprises a compressor, a refrigeration dryer, a filter, an air storage tank, a plurality of valves, a plurality of data monitoring sensors and a pipeline.
Furthermore, in the main gas path device, the gas path is divided into 4 paths, and the gas is supplied to the overhead steel pipe, the overhead PE pipe, the soil-embedded steel pipe and the soil-embedded PE pipe respectively.
Further, the plurality of data monitoring sensors includes: acoustic wave monitoring sensors, temperature sensors, overpressure sensors, and pressure sensors.
Furthermore, the sound wave experimental device comprises a leakage source simulation module and a sound wave detection and analysis module.
Furthermore, the leakage source simulation module simulates different working conditions by changing various parameters of the leakage source and various parameters of the pipeline.
Furthermore, the sound wave detection and analysis module detects the change rule of gas leakage pressure and airflow flow velocity along with the speed under different working conditions.
Furthermore, the sound wave detection and analysis module is used for comparing and analyzing all acoustic physical parameters in the pipeline gas leakage process to obtain the distribution characteristics of the sound wave signals in a time domain, a frequency domain and a space domain.
According to another aspect of the present invention, there is provided a method for performing an experiment using the pipe rack gas pipeline leakage experiment system according to the first aspect of the present invention, comprising the steps of:
simulating the structure of the gas pipeline of the pipe gallery;
simulating a gas leakage process in the simulated pipe gallery gas pipeline;
and detecting and analyzing the sound wave of the process of converting the gas leakage into the leakage.
Further, the detecting and analyzing comprises detecting the change rule of gas leakage pressure and airflow flow velocity along with the speed under different working conditions, and comparing and analyzing each acoustic physical parameter of the pipeline gas leakage process to obtain the distribution characteristics of the sound wave signals in a time domain, a frequency domain and a space domain.
In summary, the invention provides an experimental system and method for piping lane gas pipeline leakage, which is characterized in that the experimental system for piping lane gas pipeline leakage is built to simulate the structure of the piping lane gas pipeline and the gas leakage process, detect and analyze the sound wave of the gas leakage to the leakage conversion process, detect the change rule of gas leakage pressure and airflow flow rate along with the speed under different working conditions, compare and analyze various acoustic physical parameters of the pipeline gas leakage process to obtain the distribution characteristics of sound wave signals in the time domain, the frequency domain and the air domain, analyze the sound field and the temperature field characteristics in the air medium before and after the gas pipeline leakage, further obtain the sensitive parameters for judging the position of the leakage field, summarize the judgment standard of the leakage point, and improve the identification rate and the precision of the tracing and positioning.
Drawings
FIG. 1 is a schematic layout of the main air path assembly of the present invention;
FIG. 2 is a block diagram of the leakage testing system for the gas pipeline of the pipe gallery of the present invention;
FIG. 3 is a schematic layout of the pipe gallery gas pipeline leak test system of the present invention;
FIG. 4 is a schematic view of a three-dimensional gas tank model;
FIG. 5 is a diagram of an acoustic emission waveform Fourier transform process;
FIG. 6 is a flow chart of an implementation of an experimental method of the pipe gallery gas pipeline leakage experiment system.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings. According to one embodiment of the invention, a pipe gallery gas pipeline leakage experiment system is provided, before the experiment system is built, basic mechanical parameter tests such as strength limit of a gas pipe are carried out in a laboratory, the damage characteristics of the gas pipeline under the action of additional external load uncoordinated deformation, corrosion and initial fine defects are mastered, a pipeline failure mode is analyzed, a city pipe gallery pipeline gas leakage channel forming mechanism is revealed, and a foundation is provided for building the experiment system. The experimental system is shown in fig. 2, and comprises a main air path device and an acoustic wave experimental device. Wherein, main gas circuit device simulates the structure of piping lane gas pipeline, and main gas circuit device's overall arrangement sketch map is shown in FIG. 1, and main gas circuit device includes compressor, cold machine, filter, gas holder, a plurality of valve, a plurality of data monitoring sensor and pipeline, and the import and export pipeline of filter all sets up the ball valve. The gas is pressurized by a compressor, and water and grease are removed by a cold dryer and a filter and then flow out to a buffer gas storage tank. The gas flows out of the buffer tank to the test pipe section, and the valve and the mass flowmeter are used for regulating the gas flow. The gas flows from the test tube section through the mass flow meter and valve into the high pressure tank and then vents through the pressure relief valve.
In the main gas path device, the gas path is divided into 4 paths, and the gas is supplied to an overhead steel pipe, an overhead PE pipe, a soil-embedded steel pipe and a soil-embedded PE pipe respectively. Wherein, the data monitoring sensors comprise a temperature sensor, an overpressure sensor and a pressure sensor. The secondary energy storage of the air storage tank is arranged in the loop, so that the pressure in the pipeline is basically kept balanced, and the independent control of the air path in the model is realized. The real-time collection of gas parameters (such as flow, pressure, temperature, overpressure and the like) in the pipeline is realized through the data monitoring sensor, and the experimental parameters are convenient to control. The experimental system that this embodiment provided can realize convenient change leak point physical form, sets up the system of putting into of acoustic wave sensor, realizes vertical and horizontal array arrangement. Fig. 3 shows a schematic layout of sensors in the pipe gallery gas pipeline leakage experiment system of the present invention. A plurality of pressure sensors are longitudinally arranged at the right side of the pipeline leakage point and 0.1 meter away from the leakage point, for example, the number of the pressure sensors can be 4, and the pressure sensors are used for monitoring pressure change in the leakage process; at 0.1 meter left of the pipeline leakage point, a plurality of overpressure sensors and temperature sensors, for example 4, are longitudinally arranged to monitor changes in overpressure and temperature. The sound wave sensor is arranged on the top of the test pipe section equipment and used for monitoring the change of sound wave parameters in the leakage process.
Figure 4 shows gas cabin model schematic diagram, simulates the diffusion of natural gas leakage in utility tunnel gas cabin, includes through investigating utility tunnel gas pipeline arrangement, pipeline diameter, length, pressure isoparametric, establishes the experimental system that piping lane gas pipeline leaked in the laboratory, and the leakage opening is vertical upwards to spray and leaks, and machinery air intake, air exit set up the both ends at experimental system respectively.
The sound wave experimental device is connected with the main gas circuit device, and in a pipe gallery gas pipeline simulated by the main gas circuit device, the process of gas leakage is simulated, and the sound wave of the gas leakage to the leakage conversion process is detected and analyzed. The acoustic wave experimental device comprises a leakage source simulation module and an acoustic wave detection and analysis module. The leakage source simulation module uses the perforated nuts with different apertures as leakage sources and is installed at the designated position of the pipeline so as to realize the simulation of single-point or multi-point gas leakage. By carrying out a series of experiments, the characteristics of signals received by different types of sensors are tested and analyzed, a suitable frequency range is determined, and experiment parameters are optimized. By changing the leakage speed, the pipeline pressure, the physical form (such as a round hole, a flat hole and the like) of a leakage source and the like, the simulation of different types of leakage cracks and different working conditions is realized, and the change rules of the sound wave parameters under different conditions are contrastively analyzed. The sound wave detection module performs comparative analysis on acoustic physical parameters such as sound wave energy, impact, amplitude, ringing number and the like in the pipeline gas leakage process to obtain the distribution characteristics of the sound wave signals in the time domain and the frequency domain. The method is characterized by researching the characteristics of the conversion form of the simplex algorithm in the error space, analyzing the intrinsic mechanism of the divergence problem, combining the L1 norm with the simplex algorithm and establishing the simplex micropore leakage positioning method based on the L1 norm. Specifically, the acoustic emission monitor can be used for acoustic detection, so that the characteristics of the acoustic emission signal in a time domain, a frequency domain and a space domain and the frequency domain analysis of the acoustic emission signal in the pipeline rupture process are obtained. The fast fourier transform method is used to transform the acoustic emission waveform data to obtain a two-dimensional spectrogram of the waveform data, as shown in fig. 5, the frequency corresponding to the maximum power value is the main frequency value, and the second frequency value is the sub-main frequency value.
According to another embodiment of the invention, an experimental method of a pipe gallery gas pipeline leakage experimental system is provided, and an implementation flow chart of the method is shown in fig. 6, and the method comprises the following steps:
simulating the structure of the gas pipeline of the pipe gallery;
simulating a gas leakage process in the simulated pipe gallery gas pipeline;
and detecting and analyzing the sound wave of the process of converting the gas leakage into the leakage.
The detection and analysis comprises the steps of detecting the change rule of the air flow velocity along with the velocity under different working conditions, and carrying out comparative analysis on all acoustic physical parameters of the pipeline gas leakage process to obtain the distribution characteristics of the sound wave signals in a time domain, a frequency domain and a space domain.
In summary, the invention relates to an experimental system and method for piping lane gas pipeline leakage, which is characterized in that the experimental system for piping lane gas pipeline leakage is built to simulate the structure of the piping lane gas pipeline and the gas leakage process, detect and analyze the sound wave of the gas leakage to the leakage conversion process, detect the change rule of the gas flow velocity along with the speed under different working conditions, compare and analyze various acoustic physical parameters of the pipeline gas leakage process to obtain the distribution characteristics of sound wave signals in the time domain, the frequency domain and the airspace, analyze the sound field and the temperature field characteristics in the air medium before and after the gas pipeline leakage, further obtain the sensitive parameters for judging the position of the leakage field source, and summarize the identification standard of the leakage point to improve the identification rate and the precision of the source tracing and positioning.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. An experimental system for the leakage of a gas pipeline of a pipe gallery is characterized by comprising a main gas circuit device and a sound wave experimental device; wherein the content of the first and second substances,
the main gas circuit device simulates the structure of a gas pipeline of a pipe gallery;
the sound wave experimental device is connected with the main gas circuit device, a gas leakage process is simulated in a pipe gallery gas pipeline simulated by the main gas circuit device, and the sound wave of the gas leakage to the leakage conversion process is monitored and analyzed.
2. The experimental system of claim 1, wherein said main gas circuit means comprises a compressor, a freeze dryer, a filter, a gas tank, a plurality of valves, a plurality of data monitoring sensors, and piping.
3. The experimental system of claim 2, wherein the gas circuit of the main gas circuit device is divided into 4 circuits, and the gas is supplied to the overhead steel pipe, the overhead PE pipe, the soil-embedded steel pipe and the soil-embedded PE pipe respectively.
4. The experimental system of claim 3, wherein said plurality of data monitoring sensors comprises: acoustic wave monitoring sensors, temperature sensors, overpressure sensors, and pressure sensors.
5. The experimental system of claim 4, wherein the acoustic wave experimental apparatus comprises a leakage source simulation module and an acoustic wave detection analysis module.
6. The experimental system of claim 5, wherein the leakage source simulation module simulates different operating conditions by varying parameters of the leakage source and parameters of the pipeline.
7. The experimental system of claim 6, wherein the acoustic detection and analysis module detects the variation law of gas leakage pressure and gas flow velocity with speed under different working conditions.
8. The experimental system of claim 7, wherein the sound wave detection and analysis module performs comparative analysis on the acoustic physical parameters of the pipeline gas leakage process to obtain the distribution characteristics of the sound wave signals in the time domain, the frequency domain and the space domain.
9. A method of conducting experiments using the pipe gallery gas pipeline leakage experiment system of any one of claims 1-8, comprising the steps of:
simulating the structure of the gas pipeline of the pipe gallery;
simulating a gas leakage process in the simulated pipe gallery gas pipeline;
and detecting and analyzing the sound wave of the process of converting the gas leakage into the leakage.
10. The method of claim 9, wherein the detecting and analyzing comprises detecting the variation law of gas leakage pressure and gas flow velocity with velocity under different working conditions, and comparing and analyzing the acoustic physical parameters of the pipeline gas leakage process to obtain the distribution characteristics of the sound wave signals in time domain, frequency domain and space domain.
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| CN202110112913.2A CN114383054A (en) | 2021-01-27 | 2021-01-27 | Pipe gallery gas pipeline leakage experiment system and method |
| PCT/CN2021/103451 WO2022160588A1 (en) | 2021-01-27 | 2021-06-30 | Experimental system for pipe gallery gas pipeline leakage and method |
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| CN115445135A (en) * | 2022-08-15 | 2022-12-09 | 国网河北省电力有限公司电力科学研究院 | Concatenation formula utility tunnel conflagration experimental apparatus |
| CN115654380B (en) * | 2022-09-14 | 2024-04-19 | 合肥万豪能源设备有限责任公司 | Be used for coal bed gas pipeline to reveal detection device |
| CN117034740B (en) * | 2023-07-10 | 2024-06-14 | 重庆大学 | Method and system for positioning combustible gas leakage source and predicting leakage rate in tunnel |
| CN116739352B (en) * | 2023-08-11 | 2023-10-27 | 南京市燃气工程设计院有限公司 | Gas pipeline safety evaluation early warning system, method and storage medium |
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