CN113124327B - Monitoring method and device for natural gas pipeline and monitoring and scheduling system - Google Patents
Monitoring method and device for natural gas pipeline and monitoring and scheduling system Download PDFInfo
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
Abstract
The invention relates to a monitoring method, a monitoring device and a monitoring and dispatching system of a natural gas pipeline.A sensor arranged on the natural gas pipeline is used for acquiring monitoring data of the temperature, the pressure and the like of the pipeline, and judging whether the pipeline has a leakage fault according to the combined criterion of the temperature and the pressure; and a coordinate system covering the whole natural gas pipeline and a reference coordinate point arranged on the coordinate system are established, when the pipeline is judged to be in fault, a monitoring result, the coordinate of the leakage position and the alarm condition are sent to an upper computer, and the environmental condition near the leakage point is combined to schedule the fault. The accuracy of turn-off leakage judgment is improved, the position of the leakage point in a coordinate system can be quickly positioned, and the leakage point can be found in time to perform fault treatment.
Description
Technical Field
The invention relates to the technical field of pipeline safety monitoring, in particular to a monitoring method and device for a natural gas pipeline and a monitoring and scheduling system.
Background
With the gradual depletion of petroleum resources, natural gas energy is greatly valued, and natural gas projects are vigorously developed in various places. Since natural gas is a flammable and explosive hazardous material, there is a great risk in the transportation process. The pipeline transportation has the advantages of being unique in the aspects of economy, rapidness, safety and the like, so that the pipeline transportation is widely applied to the natural gas transportation industry. However, since the pipes are buried in the ground, the environmental characteristics of the pipes are accelerated to age and deform. The natural gas pressure in pipelines is very high, and whether aged pipelines can ensure the safety of transportation is widely concerned.
In the prior art, the method for monitoring the pipeline leakage mainly comprises a direct detection method and an indirect detection method, wherein the direct detection method has the advantages of accurate positioning and high sensitivity, and the defect that the method is not suitable for detecting the pipeline laid deeply; while the indirect detection method detects the pipeline leakage according to the change of the physical parameter caused by the pipeline leakage, generally speaking, the single physical parameter detection cannot comprehensively reflect the change of the pipeline condition. In addition, the prior art lacks a quick and accurate positioning method for the fault leakage point and lacks an organic combination of the fault leakage point and the ambient environment condition to calculate the possible accident scale of the fault, so that the fault is difficult to be effectively processed.
Disclosure of Invention
Based on the above situation in the prior art, the present invention aims to provide a method and an apparatus for monitoring a natural gas pipeline, and a monitoring and scheduling system, so as to solve the problems of incomplete fault detection, inaccurate positioning, and lack of calculation of fault scale in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a method for monitoring a natural gas pipeline, comprising the steps of:
establishing a rectangular coordinate system, wherein the rectangular coordinate system covers all natural gas pipelines to be tested;
setting reference coordinate points at certain intervals on the x axis and the y axis of the rectangular coordinate system;
acquiring pressure monitoring data and temperature monitoring data of each sensor at a sensor monitoring point on a natural gas pipeline;
acquiring a pressure difference value delta P between pressure data monitored by a sensor monitoring point and a previous sensor monitoring point and a temperature difference value delta T between temperature data monitored by the sensor monitoring point and original temperature data;
judging whether pipeline leakage occurs or not according to the relation between the difference value delta P and the difference value delta T and the pressure difference threshold value and the temperature threshold value respectively;
and when the pipeline leakage is judged to occur, determining the position of the leakage position in the rectangular coordinate system.
Further, the determining whether a pipeline leakage occurs according to the relationship between the pressure difference Δ P and the temperature difference Δ T and the pressure difference threshold and the temperature threshold includes:
if Δ P is not less than Δ P thresh1 Judging that the pipeline leakage occurs; alternatively, the first and second liquid crystal display panels may be,
if | Δ T | > Δ T |, or thresh1 Judging that the pipeline leakage occurs;
wherein, Δ P thresh1 Is a first pressure difference threshold, Δ T thresh1 Is a first temperature threshold.
Further, the determining whether a pipeline leakage occurs according to the relationship between the difference values Δ P and Δ T and the pressure difference threshold and the temperature threshold includes:
if Δ P thresh1 >ΔP≥ΔP thresh2 If so, judging the temperature difference between the temperature data of the sensor monitoring point and the last sensor monitoring point of the sensor monitoring point and the original temperature data respectively;
if Δ T 1 |≥ΔT thresh2 And | Δ T 2 |≥ΔT thresh2 Judging that the pipeline leakage occurs;
wherein, Δ P thresh2 Is the second pressure difference threshold, Δ T thresh2 Is a second temperature threshold; delta T 1 And Δ T 2 The difference between the temperature of the monitoring point of the sensor and the original temperature data, and the difference between the temperature data of the last monitoring point of the sensor and the original temperature data are respectively obtained.
Further, if Δ P<P thresh2 And Δ T<T thresh2 Then return to continue the comparison.
Further, Δ P thresh1 >ΔP thresh2 ；ΔT thresh1 >ΔT thresh2 。
Further, when it is determined that the pipeline leakage occurs, determining the position of the leakage position in the rectangular coordinate system, including:
if the leakage is judged to occur only through the temperature difference;
judging whether the monitoring points of the sensor coincide with the reference coordinate points respectively;
if the leakage point is superposed, the coordinate of the reference coordinate point is taken as the position of the leakage point in the rectangular coordinate system, and the monitoring point of the sensor sends monitoring information to the superposed reference coordinate point;
if the two reference coordinate points do not coincide, the monitoring information is sent to each reference coordinate point, and the monitoring information is stored by the reference coordinate points on the x axis and the y axis which receive the monitoring information firstly.
Further, when it is determined that a pipeline leakage occurs, determining a position of a leakage position in the rectangular coordinate system, including:
if the leakage is judged to occur through the pressure difference value or through the combination of the pressure difference value and the temperature difference value;
judging whether the monitoring points of the sensor are respectively superposed with the reference coordinate points;
if the leakage point and the sensor monitoring point are overlapped, calculating the coordinate of the leakage point in the rectangular coordinate system according to the coordinate of the reference coordinate point and the distance between the leakage point and the sensor monitoring point;
and if the leakage points do not coincide with the monitoring points of the sensor, sending monitoring information to each reference coordinate point, and calculating the coordinate of the leakage point in the rectangular coordinate system according to the coordinate of the reference coordinate point on the x axis and the y axis which receive the monitoring information firstly and the distance between the leakage point and the monitoring point of the sensor.
And further, sending the calculated coordinates of the leakage points in the rectangular coordinate system to an upper computer scheduling decision device.
According to a second aspect of the present invention, there is provided a monitoring device for a natural gas pipeline, comprising a reference coordinate setting module, a monitoring data obtaining module, a pipeline leakage monitoring module, and a leakage point coordinate obtaining module; wherein the content of the first and second substances,
the reference coordinate setting module is used for establishing a rectangular coordinate system, and the rectangular coordinate system covers all natural gas pipelines to be measured; setting reference coordinate points at certain intervals on the x axis and the y axis of the rectangular coordinate system;
the monitoring data acquisition module is used for acquiring pressure monitoring data and temperature monitoring data of each sensor at a sensor monitoring point on the natural gas pipeline;
the pipeline leakage monitoring module is used for comparing and acquiring the difference value delta P between the pressure data monitored by the monitoring point of the sensor and the pressure data of the previous monitoring point of the sensor and the difference value delta T between the temperature data monitored by the monitoring point of the sensor and the original temperature data; judging whether pipeline leakage occurs or not according to the relation between the difference value delta P and the difference value delta T and the pressure difference threshold value and the temperature threshold value respectively;
and the leakage point coordinate acquisition module determines the position of the leakage position in the rectangular coordinate system when judging that the pipeline leakage occurs.
According to a third aspect of the invention, a monitoring and scheduling system for a natural gas pipeline is provided, which comprises a monitoring alarm device, an upper computer scheduling decision device, a historical data query device and a waveform display device; wherein the content of the first and second substances,
the monitoring alarm device monitors various parameters of the natural gas pipeline, uploads monitoring data to the host computer scheduling decision device, and gives an alarm when the natural gas pipeline is monitored to be in fault;
the upper computer scheduling decision device processes the received monitoring data and outputs the processed monitoring data to a historical data query device and a waveform display device, and acquires the environmental condition near a leakage point according to the monitoring result of the monitoring alarm device, the coordinate of the leakage position and the alarm condition, and schedules the fault;
the historical data inquiry device stores the received monitoring data and inquires the stored monitoring data;
and the waveform display device converts the received monitoring data into corresponding waveforms to display.
Wherein the monitoring and warning device comprises the monitoring device according to the second aspect of the invention.
In summary, the invention provides a monitoring method, a monitoring device and a monitoring and scheduling system for a natural gas pipeline, wherein monitoring data such as temperature, pressure and the like of the pipeline are acquired through sensors arranged on the natural gas pipeline, and whether the pipeline has a leakage fault or not is judged according to a combined criterion of the temperature and the pressure; and a coordinate system covering the whole natural gas pipeline and a reference coordinate point arranged on the coordinate system are established, when the pipeline is judged to be in fault, a monitoring result, the coordinate of the leakage position and the alarm condition are sent to an upper computer, and the environmental conditions near the leakage point are combined to schedule the fault. Compared with the prior art, the technical scheme provided by the invention has the following beneficial technical effects:
(1) The temperature monitoring data and the pressure monitoring data are organically combined to judge the leakage of the natural gas pipeline, so that the defect that the monitoring result of single physical data is not comprehensive enough is overcome, and the accuracy of the judgment of the shutoff leakage is improved to a certain extent;
(2) Through the rectangular coordinate system covering the whole natural gas pipeline and the reference coordinate points arranged on the rectangular coordinate system, when leakage faults are judged to occur, the positions of the leakage points in the coordinate system can be quickly positioned, and the leakage points can be found in time to perform fault processing.
(3) When the leakage point with the leakage fault is judged, the environmental state near the leakage point is obtained, the fault is processed according to the environmental state near the leakage point, effective auxiliary information is provided for fault processing, scheduling and implementation, and the efficiency and accuracy of fault processing and scheduling are improved.
Drawings
FIG. 1 is a flow chart of a method of monitoring a natural gas pipeline according to the present invention;
FIG. 2 is a schematic diagram 1 illustrating the principle of calculating the coordinates of a leak in a rectangular coordinate system;
FIG. 3 is a schematic diagram of the principle of calculating the coordinates of a leak in a rectangular coordinate system 2;
FIG. 4 is a block diagram showing the structure of a monitoring device for a natural gas pipeline according to the present invention;
fig. 5 is a block diagram of the monitoring and scheduling system for a natural gas pipeline according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the accompanying drawings in combination with the embodiments. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The technical scheme of the invention is explained in detail in the following with reference to the attached drawings. According to an embodiment of the present invention, there is provided a method for monitoring a natural gas pipeline, the method having a flow chart as shown in fig. 1, including the steps of:
establishing a rectangular coordinate system based on a natural gas pipeline network formed by natural gas pipelines to be tested, wherein the rectangular coordinate system covers all the natural gas pipelines to be tested; and setting reference coordinate points at certain intervals on the x axis and the y axis of the rectangular coordinate system. Through establishing the rectangular coordinate system, cover the natural gas line network that all natural gas line that await measuring constitute for when breaking down, can fix a position leakage point's position rapidly. The wireless communication module is used for realizing communication with the sensor monitoring point and the upper computer scheduling decision device, receiving monitoring data information sent by the sensor monitoring point and uploading the monitoring data information and the coordinate information of the reference coordinate point to the upper computer scheduling decision device. When the range involved by the natural gas pipeline is small, the natural gas pipeline can also communicate with the sensor monitoring point in a wired communication mode. The spacing distance of the reference coordinate points on the x axis and the y axis can be set according to the length occupied by the natural gas pipeline or the area covered by the pipeline network under the actual condition, the expected positioning accuracy in the monitoring process and other conditions.
Sensor monitoring points are arranged on the natural gas pipeline at certain intervals, and pressure monitoring data and temperature monitoring data of each sensor located at the sensor monitoring points are obtained. The setting interval distance of the monitoring points of the sensor is basically consistent with the setting principle of the reference coordinate points. The sensors are arranged on the monitoring points of each sensor, at least comprise a pressure sensor and a temperature sensor, and also comprise sensors for monitoring physical quantities commonly used for monitoring other natural gas pipelines, such as a flow sensor, a pipe wall stress sensor, a humidity sensor and the like. The position of the monitoring point of the sensor and the position of the reference coordinate point may coincide. The sensor monitoring point is also provided with a communication module to realize the communication between the sensor monitoring point and the reference coordinate point and between the sensor monitoring point and the upper computer, and the communication module can be a wireless communication module and can also communicate with the reference coordinate point in a wired communication mode when the range related to the natural gas pipeline is small.
And acquiring the difference value delta P between the pressure data monitored by the monitoring point of the sensor and the pressure data of the previous monitoring point of the sensor, and the difference value delta T between the temperature data monitored by the monitoring point of the sensor and the original temperature data. The last sensor monitoring point typically includes data from a sensor monitoring point that is upstream and adjacent to the sensor monitoring point, depending on the direction of flow of the gas in the pipeline. And judging whether pipeline leakage occurs or not according to the relationship between the difference values delta P and delta T and the pressure difference threshold value and the temperature threshold value respectively. Specifically, the following steps may be adopted for determination:
if Δ P is not less than Δ P thresh1 If so, judging that the pipeline leakage occurs; alternatively, the first and second electrodes may be,
if | Δ T | ≧ Δ T thresh1 And judging that the pipeline leakage occurs.
If Δ P thresh1 >ΔP≥ΔP thresh2 If so, judging the temperature difference between the temperature data of the sensor monitoring point and the last sensor monitoring point of the sensor monitoring point and the original temperature data respectively;
if Δ T 1 |≥ΔT thresh2 And | Δ T 2 |≥ΔT thresh2 And judging that the pipeline leakage occurs.
If Δ P<P thresh2 And Δ T<T thresh2 Then return to continue the comparison.
Wherein, Δ P thresh1 、ΔP thresh2 First and second pressure difference thresholds, Δ T, respectively thresh1 、ΔT thresh2 First and second temperature thresholds, respectively; delta P thresh1 >ΔP thresh2 ，T thresh1 >ΔT thresh2 ；ΔT 1 And Δ T 2 The difference between the temperature of the monitoring point of the sensor and the original temperature data, and the difference between the temperature data of the last monitoring point of the sensor and the original temperature data are respectively obtained.
In order to overcome the defect that the pipeline leakage judgment is carried out through a single physical quantity, the pipeline leakage is judged in a mode of combining pressure and temperature monitoring data. When the pipeline leaks, the pressure data of the leaking position can change, so that the leaking position can be judged according to the difference value of the pressure data monitored by the sensor monitoring point and the pressure data of the previous sensor monitoring point. However, the pressure monitored at each monitoring point may also differ to varying degrees due to non-identical terrain conditions, environmental conditions, pipe wall conditions, and various other external conditions. Meanwhile, the gas volume can expand when natural gas leaks, so that once the pipeline leaks, the gas volume can expand, and the temperature of the leaking part can be reduced according to the gas internal energy formula. The temperature change is also influenced by other factors. Based on the above analysis, when the difference value of the pressure data or the value of the temperature change exceeds the corresponding first threshold value, it can be directly judged that the leak failure has occurred. When the difference between the pressure data and the temperature change value is within a certain threshold range, the leak failure needs to be determined by combining the change data of the two values in order to eliminate the influence of other factors. And when the difference value of the pressure data and the value of the temperature change are both small, the leakage fault is considered to be not generated temporarily, and the monitoring of each item of data is returned to continue.
When the pipeline leakage is judged to occur, determining the position of the leakage position in the rectangular coordinate system, wherein the step comprises the following two conditions:
if the leakage is judged to occur only through the temperature difference: judging whether the monitoring points of the sensor coincide with the reference coordinate points respectively; if the leakage point is superposed, the coordinate of the reference coordinate point is taken as the position of the leakage point in the rectangular coordinate system, and the monitoring point of the sensor sends monitoring information to the superposed reference coordinate point; if the two reference coordinate points do not coincide, the monitoring information is sent to each reference coordinate point, and the monitoring information is stored by the reference coordinate points on the x axis and the y axis which receive the monitoring information firstly.
If the leakage is judged to occur through the pressure difference value or the pressure difference value and the temperature difference value: judging whether the monitoring points of the sensor are respectively superposed with the reference coordinate points; if the leakage point and the sensor monitoring point are overlapped, calculating the coordinate of the leakage point in the rectangular coordinate system according to the coordinate of the reference coordinate point and the distance between the leakage point and the sensor monitoring point; if the leakage point and the sensor monitoring point do not coincide, the two sensor monitoring points respectively send monitoring information to each reference coordinate point, and the coordinate of the leakage point in the rectangular coordinate system is calculated according to the coordinate of the reference coordinate point on the x axis and the y axis which receive the monitoring information firstly and the distance between the leakage point and the sensor monitoring point.
Fig. 2 and fig. 3 are schematic diagrams illustrating the calculation of coordinates of a leakage point in a rectangular coordinate system when the leakage is judged to occur through a pressure difference value or a pressure difference value in combination with a temperature difference value by using the monitoring method provided by the embodiment. Referring to fig. 2, for example, a sensor monitoring point 1 and a sensor monitoring point 2 for detecting a leakage fault are respectively coincident with a reference coordinate point x on the x-axis of a rectangular coordinate system 1 And x 2 Overlapping, calculating the distance m between the leakage point and the monitoring point 1 of the sensor 1 -x 1 Wherein m is 1 X-coordinate of the leak:
wherein v is the propagation velocity of the pressure wave in the pipeline, and Δ t is the time difference between the sensor monitoring point 1 and the sensor monitoring point 2 when the pressure wave is received.
That is to say, when the monitoring point of the sensor where the pipeline leakage occurs coincides with the reference coordinate point, the monitoring point of the sensor is just located on the x axis or the y axis of the rectangular coordinate system, and the coordinate of the leakage point in the rectangular coordinate system is calculated according to the coordinate of the reference coordinate point and the distance between the leakage point and the monitoring point of the sensor.
If the coordinates do not coincide with each other, sending monitoring information to each reference coordinate point, and determining that the coordinates corresponding to the reference coordinate points A, B and C, D on the x axis and the y axis which receive the monitoring information firstly are x respectively 01 ，x 02 ，y 01 ，y 02 Referring to FIG. 3, let the coordinates of the leak point E be (x, y), m 01 Distance, m, of leak E from sensor monitor 3 02 The distance between the leakage point E and the monitoring point 4 of the sensor is as follows:
the coordinates (x, y) of the leak point E can be calculated according to the above formula.
That is, when the monitoring point of the sensor is not located on the x-axis or the y-axis of the rectangular coordinate system, the position of the monitoring point in the rectangular coordinate system needs to be determined. The method comprises the steps of determining the position of a certain point in a rectangular coordinate system, needing to confirm x coordinate information and y coordinate information of the certain point, sending temperature data, pressure data and time information data of the leakage point to each reference coordinate point by a monitoring point of a sensor, wherein the time information data is the time information data of the sending time, each reference coordinate point receives the time information data of the data according to the time information data of the sending time and the time information data of the receiving time of the data, the time that one reference coordinate point receives the same data is the earliest on an x axis and a y axis, and the coordinates of the leakage point can be calculated according to the coordinates of the two reference coordinate points and the formula.
Under the two conditions, the reference coordinate point receives monitoring information, and the monitoring information of the leakage point and the coordinate information of the leakage point are sent to the upper computer scheduling decision device.
According to a second embodiment of the present invention, a natural gas pipeline monitoring device is provided, and a block diagram of the device is shown in fig. 4, and the device includes a reference coordinate setting module, a monitoring data obtaining module, a pipeline leakage monitoring module, and a leakage point coordinate obtaining module.
The reference coordinate setting module is used for establishing a rectangular coordinate system, and the rectangular coordinate system covers all natural gas pipelines to be measured; and setting reference coordinate points at certain intervals on the x axis and the y axis of the rectangular coordinate system.
And the monitoring data acquisition module acquires pressure monitoring data and temperature monitoring data of each sensor at a sensor monitoring point on the natural gas pipeline.
The pipeline leakage monitoring module is used for comparing and acquiring the difference value delta P between the pressure data monitored by the monitoring point of the sensor and the pressure data of the previous monitoring point of the sensor and the difference value delta T between the temperature data monitored by the monitoring point of the sensor and the original temperature data; and judging whether pipeline leakage occurs or not according to the relationship between the difference values delta P and delta T and the pressure difference threshold value and the temperature threshold value respectively.
And the leakage point coordinate acquisition module is used for determining the position of the leakage position in the rectangular coordinate system when judging that the pipeline leakage occurs.
The reference coordinate setting, the monitoring data acquisition, the pipeline leakage monitoring and the leakage point coordinate acquisition modes in the modules are the same as those of the method provided in the first embodiment of the present invention, and are not described herein again.
According to a third embodiment of the present invention, a monitoring and scheduling system for a natural gas pipeline is provided, and a block diagram of the system is shown in fig. 5. The device comprises a monitoring alarm device, an upper computer scheduling decision device, a historical data inquiry device and a waveform display device.
The monitoring alarm device monitors various parameters of the natural gas pipeline, uploads monitoring data to the host computer scheduling decision device, and gives an alarm when monitoring that the natural gas pipeline breaks down. The monitoring and alarming device comprises a natural gas pipeline monitoring device according to the second embodiment of the invention, wherein each sensor of the sensor monitoring points arranged on the natural gas pipeline is included. Monitoring various parameters of the natural gas pipeline through various sensors of sensor monitoring points arranged on the natural gas pipeline, wherein the parameters comprise but are not limited to temperature data, pressure data, flow data, pipe wall stress data, humidity data and the like.
And the upper computer scheduling decision device processes the received monitoring data and outputs the monitoring data to the historical data query device and the waveform display device, and acquires the environmental state near the leakage point according to the monitoring result of the monitoring alarm device, the coordinates of the leakage position and the alarm condition, and schedules the fault. Specifically, the diffusion result possibly caused by the leakage can be calculated according to the position of the leakage point and the real-time environment state, and the fault can be scheduled and processed by combining the diffusion result. The diffusion result, which may be caused by leakage, can be obtained by:
and acquiring the environmental state of the leakage point according to the position of the leakage point in the rectangular coordinate system, and calculating the diffusion result possibly caused by the leakage according to the position of the leakage point and the environmental state. Since the diffusion degree of natural gas leakage is different when the environmental conditions are different, in order to accurately estimate the diffusion result possibly caused by the leakage, the influence of physical quantities such as humidity and temperature at the leakage point is considered during calculation to calculate the diffusion concentration at the leakage point, and the calculation formula is based on the principle that gas diffuses under different conditions and on the fitting of experimental data under actual conditions.
Acquiring the humidity H and the temperature T in the environmental state;
the diffusion concentration c was calculated according to the following formula:
where Q is the leakage flow, t is the leakage time, σ x 、σ y Diffusion parameters in the x and y axis directions are respectively, R is a gas constant, and x and y are respectively x and y axis coordinates of the leakage point.
And the historical data inquiry device is used for storing the received monitoring data and inquiring the stored monitoring data.
And the waveform display device converts the received monitoring data into corresponding waveforms to display.
In summary, the present invention relates to a monitoring method, an apparatus and a monitoring and scheduling system for a natural gas pipeline, which obtain monitoring data such as temperature and pressure of the pipeline through sensors arranged on the natural gas pipeline, and judge whether the pipeline has a leakage fault according to a combined criterion of the temperature and the pressure; and a coordinate system covering the whole natural gas pipeline and a reference coordinate point arranged on the coordinate system are established, when the pipeline is judged to be in fault, a monitoring result, the coordinate of the leakage position and the alarm condition are sent to an upper computer, and the environmental state near the leakage point is combined to schedule the fault. The natural gas pipeline leakage judgment is carried out by organically combining the temperature monitoring data and the pressure monitoring data, the defect that a single physical data monitoring result is not comprehensive enough is overcome, and the accuracy of the shutoff leakage judgment is provided to a certain extent; through the rectangular coordinate system covering the whole natural gas pipeline and the reference coordinate points arranged on the rectangular coordinate system, when leakage faults are judged to occur, the positions of the leakage points in the coordinate system can be quickly positioned, and the leakage points can be found in time to perform fault processing. When the leakage point with the leakage fault is judged, the environmental state near the leakage point is obtained, the fault is processed according to the environmental state near the leakage point, effective auxiliary information is provided for fault processing, scheduling and implementation, and the efficiency and the accuracy of the fault processing and scheduling are improved.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (9)
1. A method of monitoring a natural gas pipeline, comprising the steps of:
establishing a rectangular coordinate system, wherein the rectangular coordinate system covers all natural gas pipelines to be tested;
setting reference coordinate points at certain intervals on the x axis and the y axis of the rectangular coordinate system;
acquiring pressure monitoring data and temperature monitoring data of each sensor at a sensor monitoring point on a natural gas pipeline;
acquiring a pressure difference value delta P between pressure data monitored by a sensor monitoring point and a previous sensor monitoring point and a temperature difference value delta T between temperature data monitored by the sensor monitoring point and original temperature data;
judging whether pipeline leakage occurs or not according to the relation between the difference value delta P and the difference value delta T and the pressure difference threshold value and the temperature threshold value respectively;
when judging that pipeline leakage occurs, determining the position of a leakage point in the rectangular coordinate system, including:
if the leakage is judged to occur through the pressure difference value or through the combination of the pressure difference value and the temperature difference value; judging whether the monitoring points of the sensor are respectively superposed with the reference coordinate points;
if the leakage points are overlapped, calculating the coordinates of the leakage points in the rectangular coordinate system according to the coordinates of the reference coordinate points and the distance between the leakage points and the monitoring points of the sensor;
if the coordinate points do not coincide with each other, monitoring information is sent to each reference coordinate point, and the coordinates corresponding to the reference coordinate points on the x axis and the y axis which receive the monitoring information firstly are determined to be x respectively 01 ，x 02 ，y 01 ，y 02 Let the coordinates of the leak point be (x, y), m 01 Is the distance, m, of the leakage point from the monitoring point of the first sensor 02 The distance between the leakage point and the monitoring point of the second sensor is as follows:
wherein v is the propagation velocity of the pressure wave in the pipe,
the time difference between receipt of the pressure wave for the first sensor monitoring point and the second sensor monitoring point.
2. The method of claim 1, wherein determining whether a pipe leak has occurred based on the relationship between the pressure difference Δ P and the temperature difference Δ T and the pressure difference threshold and the temperature threshold comprises:
if Δ P is not less than Δ P thresh1 If so, judging that the pipeline leakage occurs; alternatively, the first and second electrodes may be,
if the | Δ T |, is more than or equal to Δ Tthresh1, determining that pipeline leakage occurs;
wherein, Δ P thresh1 Is a first pressure difference threshold, Δ T thresh1 Is a first temperature threshold.
3. The method of claim 1, wherein determining whether a duct leak has occurred based on the relationship between the differences Δ P and Δ T and the pressure differential threshold and the temperature threshold comprises:
if Δ P thresh1 >ΔP≥ΔP thresh2 If so, judging the temperature difference between the temperature data of the sensor monitoring point and the last sensor monitoring point of the sensor monitoring point and the original temperature data respectively;
if the | Δ T1| > is equal to or more than Δ Tthresh2 and the | Δ T2| > is equal to or more than Δ Tthresh2, determining that pipeline leakage occurs;
wherein, Δ P thresh2 At the second pressure difference threshold, Δ T thresh2 Is a second temperature threshold; delta T 1 And Δ T 2 The temperature difference between the monitoring point of the sensor and the original temperature data and the temperature difference between the temperature data of the last monitoring point of the sensor and the original temperature data are respectively obtained.
4. The method of claim 1,
if Δ P<P thresh2 And Δ T<T thresh2 Then return to continue the comparison.
5. The method of any one of claims 2-4, wherein Δ P thresh1 >ΔP thresh2 ；ΔT thresh1 >ΔT thresh2 。
6. The method of claim 5, wherein determining the location of the leak in the cartesian coordinate system when the pipeline leak is determined to occur comprises:
if the leakage is judged to occur only through the temperature difference;
judging whether the monitoring points of the sensor are respectively superposed with the reference coordinate points;
if the leakage point is superposed, the coordinate of the reference coordinate point is taken as the position of the leakage point in the rectangular coordinate system, and the monitoring point of the sensor sends monitoring information to the superposed reference coordinate point;
if the two reference coordinate points do not coincide, the monitoring information is sent to each reference coordinate point, and the monitoring information is stored by the reference coordinate points on the x axis and the y axis which receive the monitoring information firstly.
7. The method of claim 6, wherein the coordinates of the calculated leakage points in the rectangular coordinate system are sent to a host scheduling decision device.
8. A monitoring device for a natural gas pipeline is characterized by comprising a reference coordinate setting module, a monitoring data acquisition module, a pipeline leakage monitoring module and a leakage point coordinate acquisition module; wherein the content of the first and second substances,
the reference coordinate setting module is used for establishing a rectangular coordinate system, and the rectangular coordinate system covers all natural gas pipelines to be measured; setting reference coordinate points at certain intervals on the x axis and the y axis of the rectangular coordinate system;
the monitoring data acquisition module is used for acquiring pressure monitoring data and temperature monitoring data of each sensor at a sensor monitoring point on the natural gas pipeline;
the pipeline leakage monitoring module compares and acquires the difference value delta P between the pressure data monitored by the monitoring point of the sensor and the pressure data of the monitoring point of the previous sensor and the difference value delta T between the temperature data monitored by the monitoring point of the sensor and the original temperature data; judging whether pipeline leakage occurs or not according to the relation between the difference value delta P and the difference value delta T and the pressure difference threshold value and the temperature threshold value respectively;
leakage point coordinate acquisition module when judging for taking place the pipeline and leaking, confirms that the leakage point is in the position in the rectangular coordinate system includes:
if the leakage is judged to occur through the pressure difference value or through the combination of the pressure difference value and the temperature difference value; judging whether the monitoring points of the sensor are respectively superposed with the reference coordinate points;
if the leakage points are overlapped, calculating the coordinates of the leakage points in the rectangular coordinate system according to the coordinates of the reference coordinate points and the distance between the leakage points and the monitoring points of the sensor;
if the coordinate points do not coincide with each other, monitoring information is sent to each reference coordinate point, and the coordinates corresponding to the reference coordinate points on the x axis and the y axis which receive the monitoring information firstly are determined to be x respectively 01 ，x 02 ，y 01 ，y 02 Let the coordinates of the leak point be (x, y), m 01 Is the distance, m, of the leakage point from the monitoring point of the first sensor 02 And the distance between the leakage point and the monitoring point of the second sensor is as follows:
wherein v is the propagation velocity of the pressure wave in the pipe,
the time difference between receipt of the pressure wave for the first sensor monitoring point and the second sensor monitoring point.
9. A monitoring and scheduling system of a natural gas pipeline is characterized by comprising a monitoring and alarming device, an upper computer scheduling decision device, a historical data query device and a waveform display device; wherein the content of the first and second substances,
the monitoring alarm device monitors various parameters of the natural gas pipeline, uploads monitoring data to the host computer scheduling decision device, and gives an alarm when the natural gas pipeline is monitored to be in fault;
the upper computer scheduling decision device processes the received monitoring data and outputs the monitoring data to a historical data query device and a waveform display device, and acquires the environmental condition near the leakage point according to the monitoring result of the monitoring alarm device, the coordinate of the leakage point and the alarm condition, and schedules the fault;
the historical data inquiry device stores the received monitoring data and inquires the stored monitoring data;
the waveform display device converts the received monitoring data into corresponding waveforms to display
Wherein the monitoring alarm device comprises the monitoring device of claim 8.
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