WO2020093986A1 - Gas pipeline leakage detection method and apparatus - Google Patents

Abstract

A gas pipeline leakage detection method and apparatus, the method comprising the following steps: detecting the concentration of flammable gas in an underground space surrounding a plurality of gas pipelines; determining whether the concentration of flammable gas meets a leakage condition; if the leakage condition is met, then determining that the gas pipeline has a leakage, and acquiring and reporting the current leakage position. The present method determines whether a gas pipeline has a leak on the basis of the concentration of flammable gas in an underground space surrounding a plurality of gas pipelines and, when there is a leak, acquires and reports the current leakage position, in order to implement quick and scientific positioning of the leakage point of a gas pipeline, thereby enabling accurate prediction of the maximum impact range of a flammable gas leakage, facilitating daily safety maintenance of the gas pipeline network and emergency handling of leakage accidents.

Description

Gas pipeline leakage detection method and device

Cross-reference of related applications

This application requires the Chinese patent application number "201811325974.1" of the invention titled "Leak Detection Method and Device for Gas Pipeline" filed on November 8, 2018 by the Hefei Institute of Public Safety of Tsinghua University and Hefei Zezhong City Intelligent Technology Co., Ltd. "Priority.

Technical field

The invention relates to the technical field of gas pipeline leakage monitoring, in particular to a gas pipeline leakage detection method and device.

Background technique

In recent years, with the rapid expansion of Chinese cities, the scale of urban gas pipeline networks has also grown rapidly. In addition, crude oil and refined oil transportation pipelines that were originally buried in the suburbs have now become part of the city. Most of these pipelines are buried underground, and a large amount of combustible gas is directly or indirectly generated after the leakage, and diffuses into the surrounding rainwater, sewage pipe network and other municipal manholes. Due to the interconnection of rainwater and sewage pipelines, the gas can diffuse for several kilometers along the pipeline. When the concentration reaches the explosion limit, a large-scale serial explosion will occur in the event of an ignition source, resulting in the destruction of several kilometers of roads and a large number of casualties.

In related technologies, gas leak detection methods can be divided into monitoring and detection. Leakage monitoring mainly monitors a new process such as leaking from a pipeline to a sudden leak, while leak detection is to conduct regular inspections from the outside or inside of the pipeline to detect the parts that have leaked, or to leaks on the pipeline. Weak points, such as the inspection of gas companies, are a way of pipeline inspection. By regularly detecting the concentration of combustible gas around the pipeline, a pipeline leak is found. The pipeline detection method cannot effectively avoid the occurrence of a series of events after pipeline leakage due to the defects in real-time performance for pipelines transporting high-risk media.

However, gas pipeline leakage accidents are mostly small leaks, and the gas is compressible. Therefore, many methods based on front-end monitoring of flow or pressure combined with software models to find pipeline leaks, for the large number of small leaks on medium and low pressure pipelines that exist in cities Can not play a better monitoring effect. Table 1 is the statistical classification of the existing pipeline leak detection methods. Considering the feasibility, real-time and effectiveness of the monitoring technology, the applicability to the gas pipeline network is comprehensively considered. It can be seen that none of the existing monitoring methods can directly and effectively solve the city The problem of real-time detection of gas pipeline leakage.

Table 1

Summary of the invention

This application is based on the inventor's knowledge and discovery of the following issues:

For gas leakage and explosion accidents, the most ideal treatment method is to select a suitable detection method, and the pipeline leakage is detected as soon as the gas leakage occurs, so as to avoid the subsequent series of dangerous events. In the case where the existing technology cannot detect pipeline leaks in the early stage of the leak, an effective solution to pipeline leaks is to monitor the locations where gas pipelines may gather after leaking, that is, the adjacent or intersecting underground spaces of the gas pipelines. For example, monitor rainwater and sewage wells, gas valve wells, power wells, etc. around the pipeline to prevent gas explosion and explosion accidents in the space after gas leakage.

The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

Therefore, an object of the present invention is to propose a gas pipeline leak detection method, which can quickly and scientifically locate the leak point of the gas pipeline, thereby accurately predicting the maximum impact range of combustible gas leakage, and helping the gas pipeline Daily safety maintenance of the network and emergency treatment of leakage accidents.

Another object of the present invention is to provide a leak detection device for a gas pipeline.

In order to achieve the above objective, an embodiment of the present invention provides a method for leak detection of a gas pipeline, including the following steps: detecting the concentration of combustible gas in the underground space around multiple gas pipelines; determining whether the concentration of combustible gas satisfies the leakage condition; If the leak condition is satisfied, it is determined that the gas pipeline leaks, and the current leak location is acquired and reported.

The gas pipeline leak detection method according to an embodiment of the present invention determines whether the gas pipeline is leaking according to the combustible gas concentration in the underground space around the multiple gas pipelines, and obtains and reports the current leak location when the leak is made, so as to achieve rapid leakage points of the gas pipeline Scientific positioning can accurately predict the maximum impact range of combustible gas leakage, which is helpful for the daily safety maintenance of the gas pipeline network and emergency treatment of leakage accidents.

In addition, the gas pipeline leak detection method according to the above embodiments of the present invention may also have the following additional technical features:

Further, in an embodiment of the present invention, the method further includes: obtaining a characterization value of an explosion possibility size and explosion damage consequence data of each underground space around each gas pipeline of the underground spaces around all the gas pipelines; according to the possibility of explosion Characterization value and the explosion injury consequence data to obtain an explosion risk evaluation value of the underground space around each gas pipeline; use the underground space around the gas pipeline whose explosion risk evaluation value is greater than a preset value as the monitoring Underground space around a gas pipeline.

Further, in an embodiment of the present invention, the judging whether the concentration of the combustible gas satisfies the leakage condition further includes: if the current combustible gas concentration in the underground space around the gas pipeline and the combustible gas concentration at the previous moment are greater than or Is equal to the first preset concentration, and the difference between the current combustible gas concentration and the previous time combustible gas concentration is greater than zero, it is determined as a light leak; if the current combustible gas concentration is equal to or equal to the first A preset concentration, and the difference between the combustible gas concentration at the current moment and the combustible gas concentration at the previous moment is greater than or equal to the second preset concentration, it is determined to be a serious leak, where the second preset concentration is greater than the first A preset concentration.

Further, in an embodiment of the present invention, the method further includes: identifying a current hazardous area based on the current leak location and the combustible gas concentration; and controlling a preset alarm device to alarm according to the current hazardous area and a preset alarm mechanism.

Further, in an embodiment of the present invention, it further includes: controlling the opening degree of the corresponding gas pipeline valve according to the leakage position.

To achieve the above object, another embodiment of the present invention provides a leak detection device for a gas pipeline, including: a detection module for detecting the concentration of combustible gases in the underground space around a plurality of gas pipelines; and a determination module for determining Whether the concentration of the combustible gas satisfies the leak condition; the processing module is used to determine the leak of the gas pipeline when the leak condition is met, and obtain and report the current leak location.

The leak detection device for a gas pipeline according to an embodiment of the present invention determines whether the gas pipeline is leaking according to the combustible gas concentration in the underground space around a plurality of gas pipelines, and obtains and reports the current leak location when the leak is made, so as to achieve a fast Scientific positioning can accurately predict the maximum impact range of combustible gas leakage, which is helpful for the daily safety maintenance of the gas pipeline network and emergency treatment of leakage accidents.

In addition, the gas pipeline leak detection device according to the above embodiment of the present invention may also have the following additional technical features:

Further, in an embodiment of the present invention, the method further includes: an acquisition module, configured to acquire an explosion possibility characterization value and explosion injury consequence data of each underground space around each gas pipeline of the underground spaces around all the gas pipelines; An evaluation module, configured to obtain an explosion risk evaluation value of the underground space around each gas pipeline based on the explosion possibility characterization value and the explosion injury consequence data; setting a module to set the explosion risk evaluation value to be greater than The preset underground space around the gas pipeline is used as the monitored underground space around the plurality of gas pipelines.

Further, in an embodiment of the present invention, the judgment module is further used to set the combustible gas concentration at the current moment in the underground space around the gas pipeline and the combustible gas concentration at the previous moment to be greater than or equal to the first preset concentration, and When the difference between the combustible gas concentration at the current moment and the combustible gas concentration at the previous moment is greater than zero, it is determined to be a light leak; at the current moment, the combustible gas concentration is at or equal to the first preset concentration, and the current moment When the difference between the combustible gas concentration and the combustible gas concentration at the previous moment is greater than or equal to the second preset concentration, it is determined as a serious leak, wherein the second preset concentration is greater than the first preset concentration.

Further, in an embodiment of the present invention, it further includes: an identification module for identifying the current hazardous area based on the current leak location and the combustible gas concentration; an alarm module for identifying the current hazardous area and the Set an alarm mechanism to control preset alarm equipment to alarm.

Further, in an embodiment of the present invention, it further includes: a control module for controlling the opening degree of the corresponding gas pipeline valve according to the leakage position.

Additional aspects and advantages of the present invention will be partially given in the following description, and some will become apparent from the following description, or be learned through the practice of the present invention.

BRIEF DESCRIPTION

The above-mentioned and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

1 is a flowchart of a gas pipeline leak detection method according to an embodiment of the present invention;

2 is a flow chart of leakage judgment according to an embodiment of the present invention;

3 is a schematic diagram of a typical gas leakage monitoring curve according to an embodiment of the present invention;

4 is a schematic diagram of the pressure curve of the first end of a week of a pipe according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a curve for fitting a concentration change within a day according to an embodiment of the present invention;

6 is a schematic diagram of a user's gas consumption and peak-shaving curve in one day according to an embodiment of the present invention;

7 is a schematic diagram of a typical biogas monitoring curve according to an embodiment of the present invention;

8 is a schematic diagram of a gas diffusion area (without communicating wells within the maximum diffusion range) according to an embodiment of the present invention;

9 is a schematic diagram of a gas diffusion area (a communication well exists in the maximum diffusion range) according to an embodiment of the present invention;

10 is a schematic diagram of a gas pipe that may leak according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of no communication well in a possible diffusion area according to an embodiment of the present invention;

12 is a schematic diagram of a communication well in a possible diffusion area according to an embodiment of the present invention;

13 is a schematic structural diagram of a gas pipeline leak detection device according to an embodiment of the present invention.

detailed description

Hereinafter, embodiments of the present invention will be described in detail. Examples of the embodiments are shown in the drawings, in which the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are exemplary, and are intended to explain the present invention, and should not be construed as limiting the present invention.

The leak detection method and device for a gas pipeline according to an embodiment of the present invention will be described below with reference to the drawings. First, the leak detection method for a gas pipeline according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a flowchart of a gas pipeline leak detection method according to an embodiment of the present invention.

As shown in Figure 1, the leak detection method of the gas pipeline includes the following steps:

In step S101, the combustible gas concentration in the underground space around a plurality of gas pipelines is detected.

It can be understood that in the embodiments of the present invention, by arranging combustible gas intelligent monitoring sensors in the underground space adjacent to the gas pipeline, the concentration of combustible gas in the underground space can be sensed in real time, which can effectively predict and warn of explosion accidents in the underground space, and eliminate the dangerous source in the bud.

Further, in an embodiment of the present invention, the method of the embodiment of the present invention further includes: acquiring a characterization value of explosion probability and explosion injury consequence data of each underground space around each gas pipeline of all underground spaces around the gas pipeline; The characterization value of the explosion possibility and the data of the explosion injury consequence obtain the explosion risk evaluation value of the underground space around each gas pipeline; the underground space around the gas pipeline with the explosion risk evaluation value greater than the preset value is used as the underground space around the monitoring of multiple gas pipelines .

It is understandable that due to the large amount of underground space around the gas pipeline, when deploying such sensors, a typical space must be selected from many underground spaces for monitoring to ensure the feasibility and sufficiency of monitoring. Generally, the risk assessment of the adjacent underground space of the gas pipeline can be carried out, and the optimal layout of points can be carried out according to its explosion risk value. The explosion risk assessment of adjacent underground space mainly considers two parts: one is the characterization value of the possibility of explosion; the other is the consequence of explosion injury. In short, it is to select the underground space with higher risk points for sensor deployment. The optimization of the layout point is mainly based on the self-risk control of the sensor manhole.

In step S102, it is determined whether the concentration of combustible gas satisfies the leakage condition.

In an embodiment of the present invention, determining whether the concentration of combustible gas satisfies the leakage condition further includes: if the current combustible gas concentration in the underground space around the gas pipeline and the combustible gas concentration at the previous moment are greater than or equal to the first preset concentration, And the difference between the combustible gas concentration at the current moment and the combustible gas concentration at the previous moment is greater than zero, it is judged as a light leak; if the combustible gas concentration at the current moment is equal to or equal to the first preset concentration, and the combustible gas concentration at the current moment and the previous one At the moment, the difference of the combustible gas concentration is greater than or equal to the second preset concentration, it is determined as a serious leak, where the second preset concentration is greater than the first preset concentration.

It can be understood that the first preset concentration may be 0.5% VOL, and the second preset concentration may be 1% VOL. Of course, those skilled in the art may set it according to actual conditions. Here, as an example, no specific limitation is made.

For example, as shown in FIG. 2, a certain well monitoring point A equipped with equipment monitors the concentration C ₁ and C ₂ at two sampling times t ₁ and t ₂ adjacent to each other. If the concentration of c ₂ is greater than or equal to 0.5% VOL at time t ₂ . If the concentrations C ₁ and C ₂ are both greater than 0.5% VOL and C ₂ -C ₁ > 0, it is determined that there is a slow leak in the gas pipeline near the well. If 2C ₂ -C ₁ ≥1% VOL, it is judged that there is a rapid leak in the gas pipeline near the well.

In step S103, if the leak condition is satisfied, it is determined that the gas pipeline leaks, and the current leak location is acquired and reported.

It is understandable that if the concentration of combustible gas satisfies the leakage condition, that is, it is judged as light leakage or serious leakage, the current leakage location should be reported. The following will specifically explain how to determine the source of the leak.

There are two sources of alarm gas sources for methane concentration alarms. On the one hand, it is the biogas produced by the anaerobic fermentation of microorganisms in the well, on the one hand, it is the leakage gas of the adjacent gas pipeline. The two can be distinguished from the change in methane concentration over time. For gas leakage, the concentration change has a greater relationship with the pipeline pressure. That is, when the user's gas consumption is large, the gas leakage will become smaller. Conversely, when the user's gas consumption is small, the gas leakage will become larger, that is, the concentration of the non-resident meal time in the well is higher than the meal time. For biogas, it is produced by anaerobic fermentation. Anaerobic fermentation is a complex microbiological process. Research indicates that temperature affects the growth rate of methanogens and their metabolic rate to the substrate by affecting the activity of certain enzymes in the cells of methanogens. Normally, the temperature is 35 ℃, the activity of methanogens in the pipeline reaches the highest, and the corresponding methane production is also the largest. That is, the curve of the biogas concentration change has a correlation with the temperature. Further analysis is that if the well alarm exceeds the standard, the well The methane concentration tends to be higher in the evening than in the day.

The methane gas monitored in the underground space adjacent to the gas pipeline network may on the one hand come from the leakage and diffusion of the natural gas pipeline, on the other hand, it may also come from the biogas formed by the action of microorganisms in the dark and humid environment of the underground space. For natural gas and biogas, the composition is quite different, because fermentation does not produce ethane, and currently the domestic use of natural gas contains 1-2% VOL of ethane, so the current common method for enterprises is to use a portable ethane analyzer to analyze the gas Whether there is ethane to identify whether the gas is natural gas or biogas. The ethane monitoring technology used in manholes is currently immature and the sensors are expensive, so the system has not considered monitoring ethane concentration. In this context, if you want to improve the accuracy of the alarm, you can consider distinguishing the source of methane by monitoring the changes in methane concentration. Through the analysis of a large number of monitoring data, it is found that the concentration of methane detected by gas leakage shows periodic changes, and the concentration of biogas detected is related to temperature changes. The typical curve law analysis is as follows:

(1) Typical gas leakage monitoring curve

As shown in Figure 3, for a gas leakage curve monitored from June 22 to July 3, 2016, it can be found that there is no intuitive rule between the change in concentration and temperature, but there is a certain regularity in time, The overall curve shows a cyclical change with a day as a cycle, reaching a peak around 4 a.m., while the concentration in the daytime is low, especially at the lowest point in the evening period. Figure 4 is a graph of the pressure at the first end of the pipeline in a week of a civil gas pipeline in a city. From the figure, we can see that the first end of the pipeline has maintained a relatively stable pressure, and the end pressure shows a significant periodic change with the change in gas consumption. About 24 hours. The time corresponding to the highest pressure point a in the figure is 28 o'clock, which is around 4 o'clock in the morning on Tuesday; the lowest pressure is 115 o'clock, which is 7 o'clock on Friday, this cycle law and change trend and the concentration of gas leakage The changes are basically the same.

Take a day of data from the monitoring point for single-cycle analysis, real-time monitoring data is uploaded every 30 minutes, a total of 48 sets of data. The data is plotted as a scatter plot and fitted to regression. The fitting curve is a sinusoidal curve with a similarity of 0.99585. The concentration in the well began to rise from 0 o'clock to reach the highest around 5 am, then continued to fall during the day to the lowest point in the evening, and then began to rise again.

Figure 5 is the curve of the gas consumption at the end of the gas pipeline in a day. From zero to 6 a.m., the average gas consumption is lower than the average gas supply. The peak adjustment curve rises to the maximum value, and the system pressure rises; then it goes to the evening. At about 8 o'clock, the average gas consumption is higher than the gas supply, the peak-shaving curve drops to the minimum, the system pressure drops, and the terminal pressure drops to the lowest value; after 9 o'clock, the pressure enters the rising stage again. Figures 5 and 6 respectively show the concentration change curve in the well during the day when the gas leaks, the change curve of the residential gas consumption and the peak shaving curve. The change trend of the two is basically the same, with a very high degree of coincidence.

According to the above analysis, the change rule of the gas concentration monitored when a gas leak occurs is related to the pressure of the gas pipeline. The greater the pressure, the greater the leakage, and the higher the monitored concentration. In fact, the pressure monitoring or flow monitoring equipment at the end of the gas pipeline is very limited, so the pressure or flow curve at the monitoring point cannot be fully obtained, but for a terminal pipeline, the corresponding residential gas consumption rule is relatively stable For example, if the gas consumption in residential areas is large, and the pressure in the pipeline is low, the leakage will decrease, while the gas consumption in the early morning will be small, and the pressure in the pipeline will be high, and the leakage will increase accordingly. Change, a cycle is usually one day, so the concentration curve shows a regular change law.

(2) Typical biogas leakage monitoring curve

Selecting many typical scenes with high biogas, as shown in Figure 7, it is not difficult to see from the curve that the concentration change does not show obvious regularity in time, while the concentration curve and temperature curve show strong rules Sex: The temperature increases, the concentration increases, the temperature decreases, the concentration also decreases, the temperature remains stable, and its concentration also remains unchanged. The law of the concentration change in the well with temperature is related to the activity of microorganisms. Methane-producing microorganisms in underground spaces are mainly methanogens. Most methanogens are mesophilic and can maintain activity between 10 and 65 ° C in an anaerobic environment. The optimum temperature is between 20 and 45 ° C. In this interval, the higher the temperature, the stronger the fermentation, and the higher the measured concentration.

Further, in an embodiment of the present invention, the method implemented by the present invention further includes: identifying the current hazardous area according to the current leak location and the combustible gas concentration; controlling the preset alarm device to alarm according to the current hazardous area and the preset alarm mechanism.

It can be understood that, after determining the leak source, the embodiment of the present invention further confirms the hazardous area according to the location of the leak source and the current combustible gas concentration, and promptly issues a timely warning, thereby effectively improving the reliability of detection and avoiding potential by timely warning danger. The following will further explain how to determine the hazardous area.

First, the embodiment of the present invention determines the leakage diffusion model, and then identifies the hazardous area according to the leakage diffusion model, specifically including:

1. Leakage diffusion model

There are two cases of the spread of combustible gas. On the one hand, combustible gas can spread through the soil to the adjacent underground space or surface, and the other can spread into the adjacent municipal pipelines (such as sewage pipelines, cable trenches) and spread along the pipeline. The diffusion radius of combustible gas is affected by many factors such as covering medium, diffusion time, leakage volume, leakage pressure and other factors. The medium covered by the pipeline is related to the maximum range of gas leakage diffusion, and can be divided into two cases: whether there is a connecting well in the leakage range.

(1) No connected wells within the maximum diffusion range

If there is no connected well within the maximum diffusion range. At this time, the gas diffusion area has a great relationship with the pavement material, and the leakage diffusion area is shown in FIG. 8.

(2) There are connected wells within 12.5m

Connected wells exist within the maximum range of leak points. Due to the interconnection of rainwater and sewage pipelines, flammable gas may diffuse into the surrounding rainwater, sewage pipe network and other municipal manholes, and the fuel gas can diffuse a long distance along the pipeline. The explosion resulted in the destruction of several kilometers of roads and a large number of casualties. As shown in Figure 9, for example, 2 # sewage well. If the 2 # sewage well is the measuring point, the measured data shall prevail; if the 2 # sewage well does not have a measuring point, and the 3 # sewage well measures methane, then 2 # and 3 # are areas where explosion may occur, if 3 # If methane is not measured, 2 # is the explosion point, 3 # is not; if 2 # and 3 # are not the measurement points, then 2 # is the explosion point, 3 # is not.

2. Identification of hazardous areas

Considering that most gas pipelines are actually buried under urban roads, the diffusion range of gas is also affected by the restrictions of cement pavement or asphalt pavement. Take the combustible gas leakage well as the center of the circle and R ₃ as the radius to draw a circle. Find all the gas pipelines L _{i in} this area, i = 1, ₂ , 3 ... n ₁ , and n ₁ is a positive integer. The union of all gas pipelines is the gas pipeline that may be leaked, which is then monitored by relevant departments on site to determine the specific location of the pipeline leak.

L _i to end point as the center, the maximum range of the gas diffusion circle with radius R _3, the region along the circle swept by L _i moved to S _i, the resulting region is a diffusion region of the gas may be. All manholes in this range are hazardous areas. If there are connected wells in this area, one well upstream and one downstream are also classified as wells that may explode.

Further, in an embodiment of the present invention, the method implemented by the present invention further includes: controlling the opening degree of the corresponding gas pipeline valve according to the leakage position.

It can be understood that, after identifying a dangerous area and issuing an early warning, the embodiment of the present invention adjusts the corresponding gas pipeline valve according to the determined leak location, for example, when a serious leak is detected, the leak pipeline should be closed in time To prevent the gas from continuing to leak and avoid the harm caused by the continuous leak; or, for example, if the leak is relatively light, the valve opening can be reduced according to the actual situation, on the one hand, it can ensure that the user normally uses gas, and the other In terms of safety, on the premise of ensuring safety, gas leakage can be minimized to prevent potential safety hazards.

The leak detection method of the gas pipeline will be further elaborated below by way of specific embodiments.

As shown in Figure 10, there is a gas pipeline near a well A. Objectively, there is a gas leakage condition. The concentration curve changes drastically, and the peak value mostly appears in the early morning, which is judged as a gas leakage.

A is at the center, R ₃ is a radius of the circle, to find all the gas lines L _i region, these lines are gas pipeline leak may occur.

L _i to end point as the center, the maximum gas diffusion to the range of circle with radius R _3, the region along the circle swept by L _i moved to S _i, the resulting region is a diffusion region of the gas may be, are all within the range Yinjing It is a hazardous area. In addition, there may be two cases in the diffusion area. As shown in FIG. 11, there may be no communication wells in the diffusion area. As shown in FIG. 12, there may be communication wells in the diffusion area. If there is a communication well in this area, one well upstream and one downstream is also classified as a well that may explode, such as # 2 sewage well. If the 2 # sewage well is the measuring point, the measured data shall prevail; if the 2 # sewage well does not have a measuring point, and the 3 # sewage well measures methane, then 2 # and 3 # are areas where explosion may occur, if 3 # If methane is not measured, 2 # is the explosion point, 3 # is not; if 2 # and 3 # are not the measurement points, then 2 # is the explosion point, 3 # is not.

According to the gas pipeline leak detection method proposed in the embodiment of the present invention, whether the gas pipeline is leaked is determined according to the combustible gas concentration in the underground space around the multiple gas pipelines, and the current leak location is obtained and reported when the leak is made, so as to realize the leakage to the gas pipeline The point is quickly and scientifically located, so that the maximum impact range of combustible gas leakage can be accurately predicted, which is helpful for the daily safety maintenance of the gas pipeline network and the emergency treatment of the leakage accident.

Next, a structural schematic diagram of a gas pipeline leak detection device according to an embodiment of the present invention will be described with reference to the drawings.

13 is a schematic structural diagram of a gas pipeline leak detection device according to an embodiment of the present invention.

As shown in FIG. 13, the gas pipeline leak detection device 10 includes a detection module 100, a judgment module 200 and a processing module 300.

The detection module 100 is used to detect the combustible gas concentration in the underground space around multiple gas pipelines. The judgment module 200 is used to judge whether the concentration of combustible gas satisfies the leakage condition. The processing module 300 is used to determine the leak of the gas pipeline when the leak condition is satisfied, and obtain and report the current leak location. The device 10 of the embodiment of the present invention can quickly and scientifically locate the leakage point of the gas pipeline, thereby accurately predicting the maximum impact range of the combustible gas leakage, which is helpful for the daily safety maintenance of the gas pipeline network and the emergency treatment of the leakage accident.

Further, in an embodiment of the present invention, the apparatus 10 of the embodiment of the present invention further includes: an acquisition module, an evaluation module, and a setting module.

Wherein, the acquisition module is used to acquire the characterization value of explosion probability and the explosion damage consequence data of the underground space around each gas pipeline of all the gas pipelines. The evaluation module is used to obtain the explosion risk evaluation value of the underground space around each gas pipeline according to the characterization value of the explosion possibility and the explosion injury consequence data. The setting module is used to take the underground space around the gas pipeline whose explosion risk assessment value is greater than the preset value as the monitored underground space around the multiple gas pipelines.

Further, in an embodiment of the present invention, the determination module 200 is further used to determine the combustible gas concentration at the current moment in the underground space around the gas pipeline and the combustible gas concentration at the previous moment are greater than or equal to the first preset concentration, and the current moment When the difference between the combustible gas concentration and the combustible gas concentration at the previous moment is greater than zero, it is judged as light leakage; the combustible gas concentration at the current moment is equal to or equal to the first preset concentration, and the combustible gas concentration at the current moment and the combustible gas at the previous moment When the difference in concentration is greater than or equal to the second preset concentration, it is determined as a serious leak, where the second preset concentration is greater than the first preset concentration.

Further, in an embodiment of the present invention, the device 10 of the embodiment of the present invention further includes: an identification module and an alarm module.

Among them, the identification module is used to identify the current hazardous area according to the current leak location and the combustible gas concentration. The alarm module is used to control the preset alarm device according to the current dangerous area and the preset alarm mechanism.

Further, in an embodiment of the present invention, the device 10 of the embodiment of the present invention further includes: a control module. Among them, the control module is used to control the opening of the corresponding gas pipeline valve according to the leakage position.

It should be noted that the foregoing explanation and description of the embodiment of the gas pipeline leak detection method is also applicable to the gas pipeline leak detection device of this embodiment, and details are not described here.

According to the leak detection device for a gas pipeline according to an embodiment of the present invention, whether a gas pipeline is leaked is determined according to the combustible gas concentration in the underground space around a plurality of gas pipelines, and the current leak location is acquired and reported during the leak to achieve a leak to the gas pipeline The point is quickly and scientifically located, so that the maximum impact range of combustible gas leakage can be accurately predicted, which is helpful for the daily safety maintenance of the gas pipeline network and the emergency treatment of the leakage accident.

In addition, the terms “first” and “second” are used for description purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined with "first" and "second" may include at least one of the features either explicitly or implicitly. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

In the description of this specification, the description referring to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means specific features described in conjunction with the embodiment or examples , Structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. In addition, without contradicting each other, those skilled in the art may combine and combine different embodiments or examples and features of the different embodiments or examples described in this specification.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be construed as limitations to the present invention, and those of ordinary skill in the art can The embodiments are changed, modified, replaced, and modified.

Claims (10)

1. A gas pipeline leak detection method, which is characterized by the following steps:

   Detect the concentration of combustible gas in the underground space around multiple gas pipelines;

   Determine whether the concentration of the combustible gas satisfies the leakage condition; and

   If the leak condition is satisfied, it is determined that the gas pipeline leaks, and the current leak location is acquired and reported.
2. The leak detection method for a gas pipeline according to claim 1, further comprising:

   Obtain the characterization value of explosion probability and the explosion damage consequence data of the underground space around each gas pipeline of the underground space around all the gas pipelines;

   Obtain an explosion risk assessment value of the underground space around each gas pipeline according to the characteristic value of the explosion possibility and the explosion injury consequence data;

   The underground space around the gas pipeline where the explosion risk assessment value is greater than a preset value is used as the monitored underground space around the multiple gas pipelines.
3. The method for leak detection of a gas pipeline according to claim 1, wherein the determining whether the concentration of the combustible gas satisfies the leak condition further comprises:

   If the current combustible gas concentration and the previous combustible gas concentration in the underground space around the gas pipeline are both greater than or equal to the first preset concentration, and the difference between the current combustible gas concentration and the previous combustible gas concentration is greater than zero, It is judged as light leakage;

   If the current combustible gas concentration is equal to or equal to the first preset concentration, and the difference between the current combustible gas concentration and the previous moment combustible gas concentration is greater than or equal to the second preset concentration, it is determined as serious Leakage, wherein the second preset concentration is greater than the first preset concentration.
4. The leak detection method for a gas pipeline according to claim 1, further comprising:

   Identify the current hazardous area based on the current leak location and the combustible gas concentration;

   The preset alarm device is controlled to alarm according to the current dangerous area and the preset alarm mechanism.
5. The leak detection method for a gas pipeline according to any one of claims 1-4, further comprising:

   The opening of the corresponding gas pipeline valve is controlled according to the leakage position.
6. A leak detection device for a gas pipeline is characterized in that it includes:

   Detection module for detecting the combustible gas concentration in the underground space around multiple gas pipelines;

   A judgment module for judging whether the concentration of the combustible gas satisfies the leakage condition; and

   The processing module is configured to determine the leak of the gas pipeline when the leak condition is satisfied, and obtain and report the current leak location.
7. The leak detection device for a gas pipeline according to claim 6, further comprising:

   An obtaining module, used to obtain the characteristic value of the explosion possibility and the explosion damage consequence data of the underground space around each gas pipeline of the underground space around all the gas pipelines;

   An evaluation module, configured to obtain an explosion risk evaluation value of the underground space around each gas pipeline according to the characteristic value of the explosion possibility and the explosion injury consequence data;

   A setting module is configured to use the underground space around the gas pipeline whose explosion risk assessment value is greater than a preset value as the monitored underground space around the multiple gas pipelines.
8. The leak detection device for a gas pipeline according to claim 6, wherein the judgment module is further used for the combustible gas concentration at the current moment and the combustible gas concentration at the previous moment in the underground space around the gas pipeline to be greater than or equal to the first A preset concentration, and when the difference between the combustible gas concentration at the current moment and the combustible gas concentration at the previous moment is greater than zero, it is determined as a light leak; at the current moment, the combustible gas concentration is at or equal to the first preset concentration , And when the difference between the combustible gas concentration at the current moment and the combustible gas concentration at the previous moment is greater than or equal to the second preset concentration, it is determined as a serious leak, where the second preset concentration is greater than the first preset concentration.
9. The leak detection device for a gas pipeline according to claim 6, further comprising:

   An identification module for identifying a current hazardous area based on the current leak location and the combustible gas concentration;

   The alarm module is used to control a preset alarm device according to the current dangerous area and a preset alarm mechanism.
10. The leak detection device for a gas pipeline according to any one of claims 6-9, further comprising:

    The control module is used for controlling the opening degree of the corresponding gas pipeline valve according to the leakage position.

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