CN110107815B - Gas pipeline leakage detection method and device - Google Patents
Gas pipeline leakage detection method and device Download PDFInfo
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- CN110107815B CN110107815B CN201811325974.1A CN201811325974A CN110107815B CN 110107815 B CN110107815 B CN 110107815B CN 201811325974 A CN201811325974 A CN 201811325974A CN 110107815 B CN110107815 B CN 110107815B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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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
Abstract
The invention discloses a method and a device for detecting leakage of a gas pipeline, wherein the method comprises the following steps: detecting the concentration of combustible gas in underground spaces around a plurality of gas pipelines; judging whether the concentration of the combustible gas meets the leakage condition; and if the leakage condition is met, judging that the gas pipeline leaks, and acquiring and reporting the current leakage position. The method judges whether the gas pipeline leaks according to the concentration of the combustible gas in the underground space around the plurality of gas pipelines, and acquires and reports the current leakage position during leakage so as to realize rapid and scientific positioning of the leakage point of the gas pipeline, thereby accurately predicting the maximum influence range of the combustible gas leakage and being beneficial to daily safety maintenance of the gas pipeline network and emergency treatment of leakage accidents.
Description
Technical Field
The invention relates to the technical field of gas pipeline leakage monitoring, in particular to a method and a device for detecting leakage of a gas pipeline.
Background
In recent years, with the rapid scale-up of cities in China, the scale of urban gas pipeline networks is also rapidly increased, and the transport pipelines of crude oil and finished oil originally buried in suburbs are also part of cities at present. The pipelines are mostly buried underground, a large amount of combustible gas is directly or indirectly generated after leakage occurs and is diffused to surrounding rainwater, sewage pipe networks and other municipal inspection wells, and as the rainwater and the sewage pipelines are mutually communicated, the fuel gas can be diffused for several kilometers along the pipelines, and when the concentration reaches the explosion limit, large-scale interlinked explosion occurs when an ignition source is encountered, so that roads for several kilometers are damaged and a large amount of casualties are caused.
In the related art, the gas leakage detection means can be divided into two categories, namely monitoring and detection. The leakage monitoring is mainly used for monitoring a new process from leakage to sudden leakage of a pipeline, and the leakage detection is to detect a part where leakage occurs periodically from the outside or inside of the pipeline or detect a weak point where leakage may occur on the pipeline, such as the inspection of a gas company, which belongs to a pipeline detection mode, and the pipeline leakage is discovered by periodically detecting the concentration of combustible gas around the pipeline. For a pipeline for transporting high-risk media, the pipeline detection method cannot effectively avoid a series of events after the pipeline leaks due to the defect in real-time performance.
However, many gas pipeline leakage accidents are tiny leaks, and gas has compressibility, so many methods for finding pipeline leakage based on a front-end monitoring flow or pressure and a software model cannot achieve a good monitoring effect on tiny leaks on medium and low pressure pipelines existing in large quantities in cities. Table 1 shows statistical classification of the existing pipeline leakage detection method, and the applicability to the gas pipe network is comprehensively considered from the aspects of feasibility, real-time performance, effectiveness, and the like of the monitoring technology, so that it can be seen that none of the existing monitoring means can directly and effectively solve the problem of urban gas pipeline leakage real-time detection.
TABLE 1
Disclosure of Invention
The present application is based on the recognition and discovery by the inventors of the following problems:
for gas leakage explosion accidents, the most ideal processing means is to select a proper detection method, and the pipeline leakage is monitored when the gas is just leaked, so that a series of subsequent dangerous events are avoided. In the prior art, under the condition that pipeline leakage cannot be found well in the early leakage stage, an effective method for solving pipeline leakage is to monitor places where gas pipelines possibly gather after leakage, namely underground spaces where the gas pipelines are adjacent or intersected, for example, a rain and sewage well, a gas valve well, an electric power well and the like around the pipelines, so that explosion accidents in the spaces after leakage are avoided while gas leakage is found.
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, one object of the present invention is to provide a method for detecting leakage of a gas pipeline, which can realize rapid and scientific positioning of leakage points of the gas pipeline, so as to accurately predict the maximum influence range of the leakage of combustible gas, and facilitate daily safety maintenance of a gas pipeline network and emergency treatment of leakage accidents.
Another object of the present invention is to provide a leakage detecting device for a gas pipeline.
In order to achieve the above object, an embodiment of an aspect of the present invention provides a method for detecting leakage of a gas pipeline, including the following steps: detecting the concentration of combustible gas in underground spaces around a plurality of gas pipelines; judging whether the concentration of the combustible gas meets a leakage condition; and if the leakage condition is met, judging that the gas pipeline leaks, and acquiring and reporting the current leakage position.
According to the leakage detection method of the gas pipeline, whether the gas pipeline leaks or not is judged according to the concentration of combustible gas in the underground space around the plurality of gas pipelines, and the current leakage position is obtained and reported when the gas pipeline leaks, so that the leakage point of the gas pipeline is rapidly and scientifically positioned, the maximum influence range of the combustible gas leakage can be accurately predicted, and the daily safety maintenance of a gas pipeline network and the emergency disposal of a leakage accident are facilitated.
In addition, the method for detecting the leakage of the gas pipeline according to the above embodiment of the present invention may further have the following additional technical features:
further, in an embodiment of the present invention, the method further includes: acquiring an explosion possibility size representation value and explosion injury consequence data of each gas pipeline peripheral underground space of all the gas pipeline peripheral underground spaces; obtaining an explosion risk evaluation value of the underground space around each gas pipeline according to the explosion possibility size characterization value and the explosion injury consequence data; and taking the underground space around the gas pipeline with the explosion risk assessment value larger than a preset value as the monitored underground spaces around the plurality of gas pipelines.
Further, in an embodiment of the present invention, the determining whether the combustible gas concentration satisfies a leakage condition further includes: if the concentration of the combustible gas in the underground space around the gas pipeline at the current moment and the concentration of the combustible gas at the previous moment are both greater than or equal to a first preset concentration, and the difference value between the concentration of the combustible gas at the current moment and the concentration of the combustible gas at the previous moment is greater than zero or less than a second preset concentration, judging that the gas pipeline is light-level leakage; and if the concentration of the combustible gas at the current moment is equal to or higher than the first preset concentration and the difference value between the concentration of the combustible gas at the current moment and the concentration of the combustible gas at the previous moment is greater than or equal to a second preset concentration, determining that the combustible gas is seriously leaked, wherein the second preset concentration is greater than the first preset concentration.
Further, in an embodiment of the present invention, the method further includes: identifying a current dangerous area according to the current leakage position and the concentration of the combustible gas; and controlling preset alarm equipment to alarm according to the current dangerous area and a preset alarm mechanism.
Further, in an embodiment of the present invention, the method further includes: and controlling the opening of the corresponding gas pipeline valve according to the leakage position.
In order to achieve the above object, an embodiment of another aspect of the present invention provides a leakage detection apparatus for a gas pipeline, including: the detection module is used for detecting the concentration of combustible gas in underground spaces around the plurality of gas pipelines; the judging module is used for judging whether the concentration of the combustible gas meets the leakage condition; and the processing module is used for judging the leakage of the gas pipeline when the leakage condition is met, and acquiring and reporting the current leakage position.
According to the leakage detection device for the gas pipeline, whether the gas pipeline leaks or not is judged according to the concentration of combustible gas in the underground space around the plurality of gas pipelines, and the current leakage position is obtained and reported when the gas pipeline leaks, so that the leakage point of the gas pipeline is rapidly and scientifically positioned, the maximum influence range of the combustible gas leakage can be accurately predicted, and the daily safety maintenance of a gas pipeline network and the emergency treatment of leakage accidents are facilitated.
In addition, the gas pipeline leakage detection device according to the above embodiment of the present invention may further have the following additional technical features:
further, in an embodiment of the present invention, the method further includes: the acquisition module is used for acquiring the explosion possibility size representation value and the explosion injury consequence data of each underground space around the gas pipeline in all the underground spaces around the gas pipeline; the evaluation module is used for obtaining an explosion risk evaluation value of the underground space around each gas pipeline according to the explosion possibility size characterization value and the explosion injury consequence data; and the setting module is used for taking the underground space around the gas pipeline with the explosion risk assessment value larger than the preset value as the monitored underground spaces around the plurality of gas pipelines.
Further, in an embodiment of the present invention, the determining module is further configured to determine that the light level is leaked when the current time combustible gas concentration and the previous time combustible gas concentration of the underground space around the gas pipeline are both greater than or equal to a first preset concentration, and a difference between the current time combustible gas concentration and the previous time combustible gas concentration is greater than zero or less than a second preset concentration; and when the concentration of the combustible gas at the current moment is equal to or higher than the first preset concentration and the difference value between the concentration of the combustible gas at the current moment and the concentration of the combustible gas at the previous moment is greater than or equal to a second preset concentration, judging that the combustible gas is seriously leaked, wherein the second preset concentration is greater than the first preset concentration.
Further, in an embodiment of the present invention, the method further includes: the identification module is used for identifying a current dangerous area according to the current leakage position and the concentration of the combustible gas; and the alarm module is used for controlling preset alarm equipment to alarm according to the current dangerous area and a preset alarm mechanism.
Further, in an embodiment of the present invention, the method further includes: and the control module is used for controlling the opening of the corresponding gas pipeline valve according to the leakage position.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of a method of leak detection of a gas pipeline according to one embodiment of the present invention;
FIG. 2 is a flow chart of leak determination according to one embodiment of the present invention;
FIG. 3 is a schematic view of an exemplary gas leak monitoring curve according to one embodiment of the present invention;
FIG. 4 is a graphical illustration of a one-week tubing head and end pressure curve according to one embodiment of the present invention;
FIG. 5 is a schematic view of a fitted curve of concentration changes over a day according to one embodiment of the present invention;
FIG. 6 is a graph illustrating a user air usage and peak shaver curves during a day, according to an embodiment of the present invention;
FIG. 7 is a schematic view of a typical biogas monitoring curve according to one embodiment of the present invention;
FIG. 8 is a schematic view of a gas diffusion zone (no connected wells within the maximum diffusion range) according to one embodiment of the present invention;
FIG. 9 is a schematic view of a gas diffusion zone (communication wells present within the maximum diffusion range) according to one embodiment of the present invention;
FIG. 10 is a schematic view of a gas line with a potential for leaks according to one embodiment of the present invention;
FIG. 11 is a schematic view of the absence of communication wells within a possible diffusion region according to one embodiment of the present invention;
FIG. 12 is a schematic view of the presence of communication wells within a possible diffusion region in accordance with one embodiment of the present invention;
fig. 13 is a schematic structural view of a leakage detecting apparatus of a gas pipe according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The method and apparatus for detecting a leakage of a gas pipe according to an embodiment of the present invention will be described below with reference to the accompanying drawings, and first, the method for detecting a leakage of a gas pipe according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for detecting a leak in a gas pipe according to an embodiment of the present invention.
As shown in fig. 1, the method for detecting leakage of a gas pipeline includes the following steps:
in step S101, the combustible gas concentration in the underground space around the plurality of gas pipelines is detected.
It can be understood that the embodiment of the invention can sense the concentration of the combustible gas in the underground space in real time by arranging the combustible gas intelligent monitoring sensor in the underground space adjacent to the gas pipeline, can effectively predict and early warn the explosion accident of the underground space, and eliminates the danger source in the bud state.
Further, in an embodiment of the present invention, the method of an embodiment of the present invention further includes: acquiring an explosion possibility size representation value and explosion injury consequence data of each gas pipeline peripheral underground space of all gas pipeline peripheral underground spaces; obtaining an explosion risk evaluation value of the underground space around each gas pipeline according to the explosion possibility size characterization value and the explosion injury consequence data; and taking the underground space around the gas pipeline with the explosion risk assessment value larger than the preset value as the monitored underground spaces around the plurality of gas pipelines.
It can be understood that, because of the existence of a large number of underground spaces around the gas pipeline, when such sensor distribution is carried out, a typical space must be selected from the numerous underground spaces for monitoring according to certain criteria, so as to ensure the feasibility and the sufficiency of monitoring. Generally, risk assessment can be carried out on underground spaces adjacent to the gas pipeline, and point location optimized layout can be carried out according to the explosion risk value. The adjacent underground space explosion risk assessment mainly considers two parts: firstly, an explosion possibility size characterization value; the second is the result of explosion injury. In short, the underground space with higher risk points is selected for arranging the sensors, and the point arrangement optimization idea is mainly based on the self risk control of the inspection well for arranging the sensors.
In step S102, it is determined whether the combustible gas concentration satisfies the leakage condition.
In one embodiment of the present invention, determining whether the combustible gas concentration satisfies the leak condition further includes: if the concentration of the combustible gas in the underground space around the gas pipeline at the current moment and the concentration of the combustible gas at the previous moment are both greater than or equal to a first preset concentration, and the difference value between the concentration of the combustible gas at the current moment and the concentration of the combustible gas at the previous moment is greater than zero or less than a second preset concentration, judging that the gas pipeline is light-level leakage; if the concentration of the combustible gas at the current moment is equal to or higher than the first preset concentration, and the difference value between the concentration of the combustible gas at the current moment and the concentration of the combustible gas at the previous moment is greater than or equal to the second preset concentration, serious leakage is judged, wherein the second preset concentration is greater than the first preset concentration.
It is understood that the first preset concentration may be 0.5% VOL, and the second preset concentration may be 1% VOL, which may be set by one skilled in the art according to actual situations, and is taken as an example and not limited specifically herein.
For example, as shown in fig. 2, a monitoring point a of a manhole with equipment monitors two adjacent sampling times t1，t2Concentration C1，C2. If t2Time c2VOL concentration of 0.5% or more. If concentration C1，C2All greater than 0.5% VOL, and C2-C1And if the pressure is higher than 0, determining that the gas pipeline near the well has slow leakage. If 2C2-C1And if the VOL is more than or equal to 1 percent, judging that the gas pipeline near the well has quick leakage.
In step S103, if the leakage condition is satisfied, it is determined that the gas pipeline is leaking, and the current leakage position is acquired and reported.
It can be understood that if the combustible gas concentration satisfies the leakage condition, i.e. it is determined as light level leakage or serious leakage, the current leakage position should be reported. The determination of the source of the leak will be described in detail below.
The inspection well methane concentration alarm gas source has two aspects. On one hand, the biogas generated by the anaerobic fermentation of organic matters in the well is used, and on the other hand, the biogas leaked from adjacent gas pipelines is used. Both can be distinguished from changes in methane concentration over time. For gas leaks, the concentration change has a large relationship with the pipeline pressure. With the great period of user's tolerance, the gas leakage quantity will diminish, otherwise when user's tolerance is less, the gas leakage quantity will grow, concentration in the non-resident's time of using a meal well will be higher than the time of using a meal promptly. Whereas for biogas it is produced by anaerobic fermentation. Anaerobic fermentation is a complex microbiological process and studies have shown that temperature affects the growth rate of methanogens and their metabolic rate on substrates by affecting the activity of certain enzymes within the methanogen cells. Under the normal condition, the temperature is 35 ℃, the activity of methanogens in the pipeline reaches the highest, the corresponding methane yield is also the highest, namely, the methane concentration change approximate curve has correlation with the temperature, and further analysis is carried out, namely, if the methane concentration of the well is over standard, the methane concentration of the well shows the trend of higher concentration at night than at day.
Methane gas monitored in the underground space adjacent to the gas pipeline network may come from leakage and diffusion of the natural gas pipeline on the one hand, and may also come from biogas formed by the action of microorganisms in the dark and humid environment of the underground space on the other hand. For natural gas and biogas, the component difference is large, because the fermentation cannot generate ethane, and 1-2% VOL of ethane exists in the natural gas used in China at present, therefore, the current common means of enterprises is to adopt a portable ethane analyzer to analyze whether ethane exists in the gas to identify whether the gas is natural gas or biogas. The technology for monitoring ethane in the inspection well is not mature at present, and the sensor is expensive, so that the system does not consider monitoring the ethane concentration. In order to improve the alarm accuracy under the background, the methane sources can be distinguished according to the monitored methane concentration change rule. Through analysis of a large amount of monitoring data, the monitored methane concentration of gas leakage shows periodic change, the monitored concentration of methane is related to temperature change, and the typical curve rule analysis is as follows:
(1) typical gas leakage monitoring curve
As shown in fig. 3, when a gas leakage curve is monitored from 6/month 22 to 7/month 3 in 2016, it can be found that there is no intuitive law between the concentration change and the temperature, but the whole curve has a certain regularity in time, and the whole curve shows periodic changes in a period of one day, reaches a peak value before and after 4 am, and has a low concentration in the daytime, especially reaches a minimum value in the evening. Fig. 4 is a pressure curve diagram of the head end and the tail end of a pipeline in one circle of a civil gas pipeline in a certain city, and it can be seen from the graph that the head end of the pipeline keeps relatively stable pressure all the time, and the tail end pressure shows obvious periodic change along with the change of gas consumption, and the period is about 24 hours. The time corresponding to the highest pressure point a in the graph is 28, namely, 4 points in the morning on Tuesday; the period law and the variation trend are basically consistent with the concentration variation of the gas leakage in fig. 5.18 at the lowest point of pressure of 115, namely at 7 pm in friday.
And (3) taking data of a certain day of the monitoring point to perform single-cycle analysis, and uploading the real-time monitoring data every 30 minutes for 48 groups in total. The data were plotted as a scatter plot and subjected to fitted regression, as shown in fig. 5.20, the fitted curve was a sinusoid with a similarity of 0.99585. The concentration in the well starts to rise from 0 to reach the highest point at about 5 am, then continuously falls to reach the lowest point at night in the daytime, and then starts to rise again.
FIG. 5 is a graph showing the variation of the end gas consumption of a gas pipeline in a day, from zero to 6 in the morning, when the average gas consumption is lower than the average gas consumption, the peak shaving curve rises to the maximum value, and the system pressure rises; then, the average gas consumption is higher than the gas supply amount until 8 hours at night, the peak regulation curve is reduced until the minimum value, the system pressure is reduced, and the tail end pressure is reduced to the minimum value; after 9 hours the pressure has again entered the rise phase. Fig. 5 and fig. 6 show the concentration variation curve in the well and the resident gas consumption variation curve and the peak shaving curve respectively when gas leaks in one day, and the variation trends of the concentration variation curve and the resident gas consumption variation curve are basically the same, and the concentration variation curve and the resident gas consumption variation curve have quite high contact ratio.
According to the analysis, the change rule of the monitored gas concentration when gas leakage occurs is related to the pressure of a gas pipeline, and the larger the pressure is, the larger the leakage amount is, the higher the monitored concentration is. In practice, pressure monitoring or flow monitoring equipment at the tail end of a gas pipeline is very limited, so that a pressure or flow curve at a monitoring point position cannot be completely obtained, but for a tail end pipeline, a corresponding residential gas utilization rule is relatively stable, for example, for a dining period of a residential area, the gas consumption is large, the pressure in the pipeline is low, the leakage amount is reduced, the gas consumption in the early morning is small, the pressure in the pipeline is high, the leakage amount is increased, the residential gas utilization rule changes periodically along with time, one period is usually one day, and therefore a concentration curve shows a periodic change rule.
(2) Typical biogas leakage monitoring curve
A plurality of typical scenes with high methane are selected, as shown in fig. 7, and it can be easily seen from the curves that the concentration change does not show obvious regularity in time, and the concentration curve and the temperature curve show strong regularity: the temperature is increased, the concentration is increased, the temperature is reduced, the concentration is also reduced, the temperature is kept stable, and the concentration is also kept unchanged. The rule that the concentration in the well changes along with the temperature is related to the activity of microorganisms, the microorganisms generating methane in the underground space mainly comprise methanogenic bacteria, most of the methanogenic bacteria belong to a medium-temperature type, the activity can be kept between 10 ℃ and 65 ℃ in an anaerobic environment, the optimum temperature is between 20 ℃ and 45 ℃, the higher the temperature in the interval is, the stronger the fermentation effect is, and the measured concentration is higher.
Further, in one embodiment of the present invention, the method implemented by the present invention further comprises: identifying a current dangerous area according to the current leakage position and the concentration of the combustible gas; and controlling preset alarm equipment to alarm according to the current dangerous area and a preset alarm mechanism.
It can be understood that after the leakage source is determined, the dangerous area is further determined according to the position of the leakage source and the concentration of the current combustible gas, and early warning is timely sent out, so that the reliability of detection is effectively improved, and potential danger is avoided through timely early warning. How the danger zone is determined will be further explained below.
Firstly, determining a leakage diffusion model, and then identifying a dangerous area according to the leakage diffusion model, the embodiment of the invention specifically comprises the following steps:
1. model of leakage diffusion
Propagation of combustible gases there are two situations where combustible gases can diffuse through soil, on the one hand, into adjacent underground spaces or the earth's surface, and on the other hand, into and along municipal pipelines (e.g., sewer pipelines, cable trenches). The radius of diffusion of the combustible gas is affected by factors such as the covering medium, diffusion time, leakage rate, leakage pressure, etc. The pipe covering medium is related to the maximum range of gas leakage diffusion, and can be divided into two cases of whether a communication well exists in the leakage range or not for discussion.
(1) No connected well in maximum diffusion range
If there is no connected well in the maximum diffusion range. In this case, the gas diffusion area and the road surface material have a large relationship, and the leakage diffusion area is shown in fig. 8.
(2) The communicating well exists in the range of 12.5m
The communication well exists in the maximum range of the leakage point. As the rainwater and sewage pipelines are communicated with each other, combustible gas can be diffused into surrounding rainwater, sewage pipe networks and other municipal inspection wells, the gas can be diffused for a long distance along the pipelines, and when the concentration reaches the explosion limit, large-scale interlinked explosion can occur when encountering a fire source, so that roads of several kilometers are damaged and a large number of casualties are caused. As shown in fig. 9, for example, a # 2 bilge well. If the 2# sewage well is taken as a measuring point, the measured data is taken as the standard; if the No. 2 bilge well has no measuring point and the No. 3 bilge well measures methane, both No. 2 and No. 3 are areas which can explode, if No. 3 does not measure methane, the No. 2 is an explosion point, and the No. 3 is not; if neither 2# nor 3# is a station, then the 2# well is an explosion point and 3# is not.
2. Identification of dangerous areas
Considering that most of the gas pipelines are buried under urban roads in practice, the gas diffusion range is also affected by the limitation of cement pavements or asphalt pavements. With the combustible gas leakage well as the center of the circle, R3For drawing a circle for the radius, all the gas pipelines L in the area are searchedi，i＝1,2,3…n1,n1Is a positive integer. The union of all the gas pipelines is the gas pipeline which is likely to leak, and then the gas pipeline is monitored in the field by related departments to determine the specific position of the pipeline leakage.
With LiIs taken as the center of a circle and takes the maximum diffusion range R of the fuel gas3Making a circle with a radius of LiThe area swept by the movement is SiThe resulting area is the area where the gas may diffuse. All inspection wells in the range are dangerous areas. If a communication well is present in the area, a well upstream and a well downstream of the communication well are also classified as wells that may be explosive.
Further, in one embodiment of the present invention, the method implemented by the present invention further comprises: and controlling the opening of the corresponding gas pipeline valve according to the leakage position.
It can be understood that, after the dangerous area is identified and the early warning is given out, the embodiment of the invention adjusts the corresponding gas pipeline valve according to the determined leakage position, for example, when the leakage is detected to be serious, the valve of the leakage pipeline should be closed in time to prevent the gas from continuously leaking, so as to avoid the harm caused by the continuous leakage; or, for example, if the leakage is light, the valve opening can be reduced according to actual conditions, so that on one hand, normal use of fuel gas by a user can be ensured, and on the other hand, the gas leakage can be reduced to the maximum extent on the premise of ensuring safety, and potential safety hazards are prevented from being brought.
The method for detecting a leak in a gas pipeline will be further described below by way of specific examples.
As shown in fig. 10, a gas pipeline is near a certain inspection well a, and a condition of gas leakage objectively exists, a concentration curve changes violently, and a peak mostly appears in the early morning, and it is determined that gas leakage occurs.
Using A as the center of circle, R3For drawing a circle for the radius, all the gas pipelines L in the area are searchediThese lines are all gas lines that may leak.
With LiIs taken as the center of a circle and takes the maximum diffusion range R of the fuel gas3Making a circle with a radius of LiThe area swept by the movement is SiAnd the obtained area is a possible gas diffusion area, and all inspection wells in the range are dangerous areas. Further, there are two cases of the possible diffusion region, as shown in fig. 11, where there is no communication well in the possible diffusion region, and as shown in fig. 12, where there is a communication well in the possible diffusion region. If a communication well is present in the area, a well upstream and a well downstream of the communication well are also classified as wells that may be explosive, such as # 2 bilge wells. If the 2# sewage well is taken as a measuring point, the measured data is taken as the standard; if the No. 2 bilge well has no measuring point and the No. 3 bilge well measures methane, both No. 2 and No. 3 are areas which can explode, if No. 3 does not measure methane, the No. 2 is an explosion point, and the No. 3 is not; if neither 2# nor 3# is a station, then the 2# well is an explosion point and 3# is not.
According to the method for detecting the leakage of the gas pipeline, provided by the embodiment of the invention, whether the gas pipeline leaks or not is judged according to the concentration of the combustible gas in the underground space around the plurality of gas pipelines, and the current leakage position is obtained and reported during leakage, so that the leakage point of the gas pipeline is rapidly and scientifically positioned, the maximum influence range of the combustible gas leakage can be accurately predicted, and the daily safety maintenance of a gas pipeline network and the emergency treatment of leakage accidents are facilitated.
Next, a schematic structural diagram of a gas pipeline leakage detection device according to an embodiment of the present invention will be described with reference to the drawings.
Fig. 13 is a schematic structural view of a gas pipe leakage detection device according to an embodiment of the present invention.
As shown in fig. 13, the gas pipe leakage detection device 10 includes: the device comprises a detection module 100, a judgment module 200 and a processing module 300.
The detection module 100 is used for detecting the concentration of combustible gas in underground spaces around a plurality of gas pipelines. The determining module 200 is used for determining whether the concentration of the combustible gas satisfies the leakage condition. The processing module 300 is configured to determine that the gas pipeline leaks when the leakage condition is met, and acquire and report a current leakage position. The device 10 of the embodiment of the invention can realize rapid and scientific positioning of the leakage point of the gas pipeline, thereby accurately predicting the maximum influence range of the leakage of the combustible gas and being beneficial to daily safety maintenance of the gas pipeline network and emergency treatment of leakage accidents.
Further, in one embodiment of the present invention, the apparatus 10 of the embodiment of the present invention further comprises: the device comprises an acquisition module, an evaluation module and a setting module.
The acquisition module is used for acquiring the explosion possibility size representation value and the explosion injury consequence data of each underground space around the gas pipeline in all the underground spaces around the gas pipeline. The evaluation module is used for obtaining an explosion risk evaluation value of the underground space around each gas pipeline according to the explosion possibility size characterization value and the explosion injury consequence data. The setting module is used for taking the underground space around the gas pipeline with the explosion risk assessment value larger than the preset value as the monitored underground spaces around the plurality of gas pipelines.
Further, in an embodiment of the present invention, the determining module 200 is further configured to determine that the light level is leaked when the current-time combustible gas concentration and the previous-time combustible gas concentration of the underground space around the gas pipeline are both greater than or equal to a first preset concentration, and a difference between the current-time combustible gas concentration and the previous-time combustible gas concentration is greater than zero or less than a second preset concentration; and when the concentration of the combustible gas at the current moment is equal to or higher than a first preset concentration and the difference value between the concentration of the combustible gas at the current moment and the concentration of the combustible gas at the previous moment is greater than or equal to a second preset concentration, judging that the combustible gas is seriously leaked, wherein the second preset concentration is greater than the first preset concentration.
Further, in one embodiment of the present invention, the apparatus 10 of the embodiment of the present invention further comprises: the device comprises an identification module and an alarm module.
The identification module is used for identifying the current dangerous area according to the current leakage position and the concentration of the combustible gas. The alarm module is used for controlling the preset alarm equipment to alarm according to the current dangerous area and the preset alarm mechanism.
Further, in one embodiment of the present invention, the apparatus 10 of the embodiment of the present invention further comprises: and a control module. The control module is used for controlling the opening degree of the corresponding gas pipeline valve according to the leakage position.
It should be noted that the explanation of the embodiment of the method for detecting leakage of a gas pipeline is also applicable to the device for detecting leakage of a gas pipeline of this embodiment, and will not be described herein again.
According to the leakage detection device for the gas pipeline provided by the embodiment of the invention, whether the gas pipeline leaks or not is judged according to the concentration of combustible gas in the underground space around the plurality of gas pipelines, and the current leakage position is obtained and reported when the gas pipeline leaks, so that the leakage point of the gas pipeline is rapidly and scientifically positioned, the maximum influence range of the combustible gas leakage can be accurately predicted, and the daily safety maintenance of a gas pipeline network and the emergency treatment of leakage accidents are facilitated.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (6)
1. A gas pipeline leakage detection method is characterized by comprising the following steps:
acquiring an explosion possibility size representation value and explosion injury consequence data of each gas pipeline peripheral underground space of all gas pipeline peripheral underground spaces;
obtaining an explosion risk evaluation value of the underground space around each gas pipeline according to the explosion possibility size characterization value and the explosion injury consequence data;
taking the underground space around the gas pipeline with the explosion risk assessment value larger than a preset value as a plurality of monitored underground spaces around the gas pipeline, and arranging sensors in the underground spaces around the gas pipeline;
detecting the concentration of combustible gas in underground spaces around a plurality of gas pipelines through the distributed sensors;
judging whether the combustible gas concentration meets a leakage condition, wherein judging whether the combustible gas concentration meets the leakage condition further comprises: if the concentration of the combustible gas in the underground space around the gas pipeline at the current moment and the concentration of the combustible gas at the previous moment are both greater than or equal to a first preset concentration, and the difference value between the concentration of the combustible gas at the current moment and the concentration of the combustible gas at the previous moment is greater than zero or less than a second preset concentration, judging that the gas pipeline is light-level leakage; if the concentration of the combustible gas at the current moment is greater than or equal to the first preset concentration, and the difference value between the concentration of the combustible gas at the current moment and the concentration of the combustible gas at the previous moment is greater than or equal to a second preset concentration, determining that serious leakage exists, wherein the second preset concentration is greater than the first preset concentration; and
and if the leakage condition is met, judging that the gas pipeline leaks, and acquiring and reporting the current leakage position.
2. The method of detecting a leak in a gas pipe according to claim 1, further comprising:
identifying a current dangerous area according to the current leakage position and the concentration of the combustible gas;
and controlling preset alarm equipment to alarm according to the current dangerous area and a preset alarm mechanism.
3. The method for detecting a leak in a gas pipe according to any one of claims 1 to 2, further comprising:
and controlling the opening of the corresponding gas pipeline valve according to the leakage position.
4. A gas pipeline's leak detection device, characterized by includes:
the acquisition module is used for acquiring the explosion possibility size representation value and the explosion injury consequence data of each underground space around the gas pipeline in all the underground spaces around the gas pipeline;
the evaluation module is used for obtaining an explosion risk evaluation value of the underground space around each gas pipeline according to the explosion possibility size characterization value and the explosion injury consequence data;
the setting module is used for taking the underground space around the gas pipeline with the explosion risk assessment value larger than the preset value as a plurality of monitored underground spaces around the gas pipeline, and distributing sensors in the underground spaces around the gas pipeline;
the detection module is used for detecting the concentration of combustible gas in underground spaces around the plurality of gas pipelines through the distributed sensors;
the judgment module is used for judging whether the concentration of the combustible gas meets the leakage condition, wherein the judgment module is further used for judging that the gas leaks in a light level when the concentration of the combustible gas in the underground space around the gas pipeline at the current moment and the concentration of the combustible gas at the previous moment are both greater than or equal to a first preset concentration, and the difference value between the concentration of the combustible gas at the current moment and the concentration of the combustible gas at the previous moment is greater than zero or less than a second preset concentration; when the concentration of the combustible gas at the current moment is greater than or equal to the first preset concentration and the difference value between the concentration of the combustible gas at the current moment and the concentration of the combustible gas at the previous moment is greater than or equal to a second preset concentration, determining that the combustible gas is seriously leaked, wherein the second preset concentration is greater than the first preset concentration; and
and the processing module is used for judging the leakage of the gas pipeline when the leakage condition is met, and acquiring and reporting the current leakage position.
5. The gas pipe leakage detection device according to claim 4, further comprising:
the identification module is used for identifying a current dangerous area according to the current leakage position and the concentration of the combustible gas;
and the alarm module is used for controlling preset alarm equipment to alarm according to the current dangerous area and a preset alarm mechanism.
6. The gas pipe leakage detecting device according to any one of claims 4 to 5, further comprising:
and the control module is used for controlling the opening of the corresponding gas pipeline valve according to the leakage position.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811325974.1A CN110107815B (en) | 2018-11-08 | 2018-11-08 | Gas pipeline leakage detection method and device |
| PCT/CN2019/115545 WO2020093986A1 (en) | 2018-11-08 | 2019-11-05 | Gas pipeline leakage detection method and apparatus |
| SG11202006240UA SG11202006240UA (en) | 2018-11-08 | 2019-11-05 | Gas pipeline leakage detection method and apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811325974.1A CN110107815B (en) | 2018-11-08 | 2018-11-08 | Gas pipeline leakage detection method and device |
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| CN110107815A CN110107815A (en) | 2019-08-09 |
| CN110107815B true CN110107815B (en) | 2021-04-06 |
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| CN201811325974.1A Active CN110107815B (en) | 2018-11-08 | 2018-11-08 | Gas pipeline leakage detection method and device |
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| CN (1) | CN110107815B (en) |
| SG (1) | SG11202006240UA (en) |
| WO (1) | WO2020093986A1 (en) |
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| CN110107815B (en) * | 2018-11-08 | 2021-04-06 | 清华大学合肥公共安全研究院 | Gas pipeline leakage detection method and device |
| CN111104720B (en) * | 2019-12-12 | 2023-03-24 | 合肥泽众城市智能科技有限公司 | Monitoring point arrangement method for underground space gas explosion risk prevention and control |
| CN111091149B (en) * | 2019-12-16 | 2021-07-30 | 北京讯腾智慧科技股份有限公司 | Gas leakage detection method, system, terminal and computer storage medium based on multi-source data fusion |
| CN113090953B (en) * | 2019-12-23 | 2022-12-23 | 未势能源科技有限公司 | Method and device for detecting gas leakage in gas supply system, storage medium and vehicle |
| CN111475967B (en) * | 2020-05-13 | 2023-09-19 | 中国安全生产科学研究院 | Method for calculating consequences of gas pipeline limited space leakage accident |
| CN111623239A (en) * | 2020-05-29 | 2020-09-04 | 张峰 | Method for monitoring characteristic flow of low-pressure gas pipeline |
| CN111895273B (en) * | 2020-07-30 | 2022-07-19 | 合肥泽众城市智能科技有限公司 | Gas pipeline leakage tracing method |
| CN112197176B (en) * | 2020-09-28 | 2022-10-04 | 广州东部发展燃气有限公司 | Gas leakage detection system |
| CN112413640A (en) * | 2020-11-23 | 2021-02-26 | 上海轻叶能源股份有限公司 | Intelligent gas burner ignition system |
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| CN113465826A (en) * | 2021-05-26 | 2021-10-01 | 北京市燃气集团有限责任公司 | Gas leakage detection method and device |
| CN113864658B (en) * | 2021-09-01 | 2023-11-03 | 常州维格电子有限公司 | System and method for detecting leakage fault of gas pipeline |
| CN114234060B (en) * | 2021-12-14 | 2023-09-29 | 深圳市恒兴盛厨具有限公司 | Gas leakage alarm method and system for gas oven |
| CN114251604B (en) * | 2021-12-16 | 2023-11-03 | 深泓科技(深圳)有限公司 | Pipeline risk assessment comprehensive management method and device based on online water quantity and water quality monitoring |
| CN114623391B (en) * | 2022-04-11 | 2023-11-21 | 广州燃气集团有限公司 | Positioning method for leakage position of gas pipeline |
| CN114859006A (en) * | 2022-05-19 | 2022-08-05 | 深圳市胜思达科技有限公司 | Combustible gas detection method, system and terminal equipment |
| CN114893730A (en) * | 2022-05-30 | 2022-08-12 | 北京市燃气集团有限责任公司 | Leakage early warning detection method and system for indoor gas system |
| CN114912372B (en) * | 2022-06-17 | 2024-01-26 | 山东黄金矿业科技有限公司充填工程实验室分公司 | High-precision filling pipeline fault early warning method based on artificial intelligence algorithm |
| CN116256470B (en) * | 2023-01-16 | 2023-11-28 | 南京市燃气工程设计院有限公司 | Hydrogen quality on-line analysis system based on hydrogen adding station |
| CN115798157B (en) * | 2023-02-08 | 2023-05-23 | 山东斯弗特智能科技有限公司 | Combustible gas leakage alarm |
| CN116643525B (en) * | 2023-06-05 | 2024-03-08 | 广州研测安全技术有限公司 | AI artificial intelligence gas safety monitoring system |
| 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 |
| CN117395291B (en) * | 2023-12-11 | 2024-02-20 | 中汽数据有限公司 | Multi-hydrogen-related environment linkage safety monitoring system, method, equipment and medium |
| CN117826693A (en) * | 2024-03-05 | 2024-04-05 | 山东港源管道物流有限公司 | Intelligent oil depot monitoring and early warning system and method |
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| CN110107815B (en) * | 2018-11-08 | 2021-04-06 | 清华大学合肥公共安全研究院 | Gas pipeline leakage detection method and device |
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- 2018-11-08 CN CN201811325974.1A patent/CN110107815B/en active Active
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2019
- 2019-11-05 SG SG11202006240UA patent/SG11202006240UA/en unknown
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| SG11202006240UA (en) | 2020-07-29 |
| WO2020093986A1 (en) | 2020-05-14 |
| CN110107815A (en) | 2019-08-09 |
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