CN109798151B - Method for intelligently monitoring operation condition of gas extraction pipeline - Google Patents
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- 238000000605 extraction Methods 0.000 title claims abstract description 167
- 238000012544 monitoring process Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 39
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 98
- 238000006073 displacement reaction Methods 0.000 claims abstract description 28
- 230000010365 information processing Effects 0.000 claims abstract description 9
- 238000012545 processing Methods 0.000 claims abstract description 7
- 238000004458 analytical method Methods 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000002893 slag Substances 0.000 claims description 12
- 238000009825 accumulation Methods 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 230000008021 deposition Effects 0.000 claims description 5
- 239000003365 glass fiber Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 107
- 238000005516 engineering process Methods 0.000 description 9
- 239000003245 coal Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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Abstract
A method for intelligently monitoring the running condition of a gas extraction pipeline comprises the steps that a methane sensor (8), a flow sensor (5), an ultrasonic distance sensor (7) and a displacement sensor (11) are installed in a spherical device (6), the spherical device is arranged in a gas extraction pipeline (1), and when the spherical device moves in the gas extraction pipeline, the methane concentration C in the gas extraction pipeline, the flow Q in the pipeline, the distance d between the spherical device and the inner wall of the gas extraction pipeline and the movement displacement X of the spherical device are monitored in real time through the methane sensor, the flow sensor, the ultrasonic distance sensor and the displacement sensor; and transmitting the data to a ground information processing terminal for data processing and analysis, so as to monitor whether the gas extraction pipeline is blocked or leaked. The method can accurately detect the positions of blockage and leakage of the gas extraction pipeline, shorten the time for repairing the pipeline, improve the gas extraction efficiency and avoid safety accidents.
Description
Technical Field
The invention relates to a monitoring method of a gas extraction pipeline, in particular to a method for intelligently monitoring the operation condition of the gas extraction pipeline, which is particularly suitable for monitoring the operation condition of the gas extraction pipeline which is easy to block and leak in the pipeline and belongs to the technical field of coal safety monitoring.
Background
Along with the increase of the mining depth and the mining quantity of a coal mine, the methane emission quantity is more and more, and most of mines extract coal bed gas by laying a gas extraction pipeline in order to ensure safe production. In partial mines in China, gas extraction pipelines are mostly laid in a return air roadway, the roadway maintenance capability is poor, the extraction pipelines are aged and rusted to cause gas leakage, the external conditions are severe, roof fall, water drenching, floor heave and the like easily occur, so that the aged and rusted extraction pipelines are broken, the gas leakage is more serious, air is easily mixed in the extraction pipelines under the condition of extraction negative pressure, the extraction efficiency is reduced, oxygen is mixed in the extraction pipelines under the condition of leakage, and gas explosion can be caused under certain conditions; therefore, the operation condition of the gas extraction pipeline is monitored in real time, and the positions of blockage and leakage of the gas extraction pipeline are found in a short time, so that the method is very important for improving the gas extraction efficiency and safely operating the gas extraction pipeline.
At present, the monitoring technology of the running state of a gas extraction pipeline under a coal mine mainly refers to the related technology in the petroleum and natural gas industry, the monitoring technology mainly has two forms, one is the monitoring technology of the running state of the pipeline based on hardware, and the other is the monitoring technology of the running state of the pipeline based on software, wherein the monitoring technology of the running state of the pipeline based on hardware mainly depends on monitoring the pipe wall and the surrounding environment of the pipeline through manual inspection or various instruments and equipment based on the principles of optics, acoustics, chemistry and the like, and the method can not realize continuous real-time monitoring of the pipeline; the monitoring technology of the pipeline running condition based on software is unstable; moreover, the efficiency of manual inspection monitoring means is lower and lower, the pipeline repairing time is greatly prolonged, and the gas extraction efficiency and the safe production of a mine are influenced; the pipeline leakage detection technology based on software is a development direction of a future extraction pipeline monitoring technology, and the method mainly analyzes and processes signals such as temperature, flow and pressure acquired in real time so as to monitor the operation condition of the pipeline and locate the fault position.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the method for intelligently monitoring the running condition of the gas extraction pipeline, the method can timely and accurately detect the positions of blockage and leakage of the gas extraction pipeline, can detect the places which cannot be detected manually, can shorten the time for repairing the pipeline, ensure the safe running of the gas extraction pipeline, improve the gas extraction efficiency and simultaneously avoid the occurrence of safety accidents.
In order to solve the technical problem, the invention provides a method for intelligently monitoring the running condition of a gas extraction pipeline, which comprises the following steps:
the method comprises the following steps: the methane sensor, the flow sensor, the ultrasonic distance sensor and the displacement sensor are installed in the spherical device, and the spherical device is arranged in the gas extraction pipeline and moves in the gas extraction pipeline under the action of extraction negative pressure;
step two: while the spherical device moves in the gas extraction pipeline, monitoring the methane concentration C in the gas extraction pipeline, the flow Q in the pipeline, the distance d between the spherical device and the inner wall of the gas extraction pipeline and the axial movement displacement X of the spherical device in real time through a methane sensor, a flow sensor, an ultrasonic distance sensor and a displacement sensor;
step three: and C, transmitting the data monitored in the step II to a ground information processing terminal in real time through wireless, and processing and analyzing the data through the ground information processing terminal, so as to monitor whether the gas extraction pipeline is blocked or leaked.
As a further improvement of the present invention, the method for determining whether the gas extraction pipeline is blocked in step three is as follows:
the method comprises the following steps: the distance d between the spherical device and the inner wall of the gas extraction pipeline is monitored in real time, and the numerical value of the distance d should satisfy the formula (1)
d＝h-d1(1)
In the formula: d is the distance between the spherical device and the inner wall of the gas extraction pipeline;
h is the pipe diameter of the gas extraction pipeline;
d1the diameter of a spherical device;
if the gas extraction pipeline is in a normal operation state and is not blocked, the distance d between the spherical device and the inner wall of the gas extraction pipeline is a constant, and if the gas extraction pipeline is blocked, the distance d between the spherical device and the inner wall of the gas extraction pipeline is changed;
step two: when the spherical device monitors that the distance d between the spherical device and the inner wall of the gas extraction pipeline changes, the axial movement displacement X of the spherical device at the moment is recorded1When the distance d between the spherical device and the inner wall of the gas extraction pipeline is recovered to a normal value, the axial movement displacement X of the spherical device at the moment is recorded2Gas drainage caused by accumulated water and accumulated slagThe length of the blockage of the production pipeline is X2-X1；
Step three: the distance d between the spherical device and the inner wall of the gas extraction pipeline monitored by the spherical device at the blocking position and the length X of the gas extraction pipeline blocking position2-X1Fitting to obtain the distance d between the spherical device and the inner wall of the gas extraction pipeline and the length X of the gas extraction pipeline blockage caused by accumulated water and accumulated slag2-X1D (x), the volume V of blockage caused by water accumulation and slag accumulation1Satisfy formula (2)
In the formula: v1The plugging volume of accumulated water and accumulated slag;
h is the pipe diameter of the gas extraction pipeline;
d1the diameter of a spherical device;
X2-X1is the plug length;
d is the distance between the spherical device and the inner wall of the gas extraction pipeline;
if the gas extraction pipeline is not blocked, the volume of the gas extraction pipeline section meets the formula (3)
Step four: according to V1And V2Determining the blockage degree of the gas extraction pipeline according to the ratio.
Dividing the blockage degree of the gas extraction pipeline in the fourth step into slight blockage A3General blockage A2Severe clogging of A1Three levels, the grade division is according to the formula (4)
As a further improvement of the present invention, the method for determining whether the gas extraction pipeline leaks in step three is as follows:
the method comprises the following steps: whether the extraction drill hole leaks or not is determined through analyzing and processing the methane concentration C1 m in front of and behind the joint of the gas extraction pipeline and the water discharger and the flow Q in the pipeline; taking a methane concentration C every 0.1miAnd pipe flow QjThe average concentration of methane at the front 1m of the joint and the average flow of the pipeline are respectively
The average concentration of methane at the rear 1m of the joint and the average flow of the pipeline are respectively
If a leak occurs then
Wherein
α＝ηβ；
Step two: dividing the leakage degree in the step one into three grades of light leakage B3, general leakage B2 and serious leakage B1, wherein the leakage grade is divided into (5)
Monitoring leakage of other positions of the gas extraction pipeline is judged according to the methane concentration monitored by the methane sensor in real time; if the gas extraction pipeline is not leaked, the methane concentration C in the gas extraction pipeline is unchanged, namely C1＝C2＝…＝CnIf the pipeline leakage happens, external air leaks into the pipeline to dilute the methane concentration, the concentration is reduced, and the leakage grade is divided according to a formula (6)
As a further improvement of the invention, the gas extraction pipeline can be an iron pipe, a PE pipe, a PVC pipe and a glass fiber pipe.
As a further development of the invention, the spherical device is of explosion-proof design.
As a further improvement of the invention, an intrinsic safety power supply is arranged in the spherical device and respectively supplies power to the methane sensor, the flow sensor, the ultrasonic distance sensor and the displacement sensor.
According to the invention, a methane sensor, a flow sensor, an ultrasonic distance sensor and a displacement sensor are integrated in a spherical device, the spherical device is installed in a gas extraction pipeline, the spherical device is provided with running power by means of extraction negative pressure, the methane concentration, the flow rate in the pipeline, the distance between the spherical device and the inner wall of the gas extraction pipeline and the displacement of the spherical device are monitored by the methane sensor, the flow sensor, the ultrasonic distance sensor and the displacement sensor in the gas extraction pipeline in real time while the spherical device runs, the monitored data are transmitted to a ground information processing terminal in real time through wireless transmission and are analyzed and processed, and then the leakage and blockage positions and the severity on the gas extraction pipeline are accurately obtained. The method effectively overcomes the defects that the gas extraction pipeline cannot be continuously detected during manual detection, the positions and sizes of leakage and blockage of the gas extraction pipeline cannot be timely and accurately determined, and the method can also detect the places which cannot be detected manually, greatly shortens the time for repairing or clearing the pipeline blockage, ensures the safe operation of the gas extraction pipeline, improves the gas extraction efficiency, avoids accidents, and has extremely high application value.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1. the method comprises the following steps of gas extraction pipeline 3, a ground information processing terminal 4, water accumulation and slag deposition 5, a flow sensor 6, a spherical device 7, an ultrasonic distance sensor 8, a methane sensor 9, a water drainage device 10, an extraction drill hole 11 and a displacement sensor.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
A method for intelligently monitoring the running condition of a gas extraction pipeline comprises the following steps:
the method comprises the following steps: the methane sensor 8, the flow sensor 5, the ultrasonic distance sensor 7 and the displacement sensor 11 are installed in the spherical device 6, and the spherical device 6 is arranged in the gas extraction pipeline 1 and moves in the gas extraction pipeline 1 under the action of extraction negative pressure;
step two: while the spherical device 6 moves in the gas extraction pipeline 1, monitoring the methane concentration C in the gas extraction pipeline 1, the flow Q in the pipeline, the distance d between the spherical device 6 and the inner wall of the gas extraction pipeline 1 and the axial movement displacement X of the spherical device 6 in real time through the methane sensor 8, the flow sensor 5, the ultrasonic distance sensor 7 and the displacement sensor 11;
step three: and (4) transmitting the data monitored in the step (II) to a ground information processing terminal 3 in real time through wireless, and processing and analyzing the data through the ground information processing terminal 3, so as to monitor whether the gas extraction pipeline 1 is blocked or leaked.
Further, the method for judging whether the gas extraction pipeline 1 is blocked in the third step is as follows:
the method comprises the following steps: the distance d between the spherical device 6 and the inner wall of the gas extraction pipeline 1 is monitored in real time, and the numerical value of the distance d should satisfy the formula (1)
d＝h-d1(1)
In the formula: d is the distance between the spherical device and the inner wall of the gas extraction pipeline;
h is the pipe diameter of the gas extraction pipeline;
d1the diameter of a spherical device;
if the gas extraction pipeline is in a normal operation state and is not blocked, the distance d between the spherical device 6 and the inner wall of the gas extraction pipeline 1 is a constant, and if the gas extraction pipeline 1 is blocked, the distance d between the spherical device 6 and the inner wall of the gas extraction pipeline 1 is changed;
step two: when the spherical device 6 monitors the distance between the spherical device 6 and the inner wall of the gas extraction pipeline 1The axial displacement X of the spherical means 6 is recorded at the same time as the distance d changes1When the distance d between the spherical device 6 and the inner wall of the gas extraction pipeline 1 is recovered to a normal value, the axial movement displacement X of the spherical device 6 at the moment is recorded2The length of the blockage of the gas extraction pipeline 1 caused by water accumulation and slag deposition 4 is X2-X1；
Step three: monitoring the distance d between the spherical device 6 and the inner wall of the gas extraction pipeline 1 and the length X of the blockage of the gas extraction pipeline 1 at the blockage position of the spherical device 62-X1Fitting to obtain the distance d between the spherical device 6 and the inner wall of the gas extraction pipeline 1 and the length X of the blockage of the gas extraction pipeline 1 caused by the accumulated water and the accumulated slag 42-X1D (x), the volume V of the blockage caused by the water accumulation and the slag deposition 41Satisfy formula (2)
In the formula: v1The plugging volume of accumulated water and accumulated slag;
h is the pipe diameter of the gas extraction pipeline;
d1the diameter of a spherical device;
X2-X1is the plug length;
d is the distance between the spherical device and the inner wall of the gas extraction pipeline;
if the gas extraction pipeline 1 is not blocked, the volume of the gas extraction pipeline 1 at the section meets the formula (3)
Step four: according to V1And V2Determining the blockage degree of the gas extraction pipeline 1 according to the ratio.
Dividing the blockage degree of the gas extraction pipeline 1 in the fourth step into slight blockage A3General blockage A2Severe clogging of A1Three levels, the grade division is according to the formula (4)
Further, the method for judging whether the gas extraction pipeline 1 leaks in the third step is as follows:
the method comprises the following steps: whether the extraction drill hole 10 leaks or not is determined through analysis processing of the methane concentration C and the flow Q in the pipeline, wherein the methane concentration C is 1m at the front and back of the joint of the gas extraction pipeline 1 and the water discharger 9; taking a methane concentration C every 0.1miAnd pipe flow QjThe average concentration of methane at the front 1m of the joint and the average flow of the pipeline are respectively
The average concentration of methane at the rear 1m of the joint and the average flow of the pipeline are respectively
If a leak occurs then
Wherein
α＝ηβ；
Step two: dividing the leakage degree in the step one into three grades of a slight leakage B3, a general leakage B2 and a serious leakage B1, wherein the leakage grade is divided into (5) according to a formula; the leakage monitoring of other positions of the gas extraction pipeline 1 is judged through the methane concentration monitored by the methane sensor 8 in real time; if the gas extraction pipeline 1 is not leaked, the methane concentration C in the gas extraction pipeline 1 is unchanged, namely C1＝C2＝…＝CnIf the pipeline leakage happens, external air leaks into the pipeline to dilute the methane concentration, the concentration is reduced, and the leakage grade is divided according to a formula (6)
The monitored data are not influenced by the material of the pipe material of the gas extraction pipeline 1, and the material of the gas extraction pipeline 1 can be an iron pipe, a PE pipe, a PVC pipe, a glass fiber pipe and other underground common gas extraction pipes.
Because the gas extraction pipeline has a severe environment, in order to prolong the service life of the spherical device 6, the external part of the spherical device 6 is preferably designed to be explosion-proof.
An intrinsic safety power supply is arranged in the spherical device 6 and respectively supplies power to the methane sensor 8, the flow sensor 5, the ultrasonic distance sensor 7 and the displacement sensor 11.
The invention relates to a monitoring system for intelligently monitoring the running condition of a gas extraction pipeline, wherein a methane sensor 8, a flow sensor 5, an ultrasonic distance sensor 7 and a displacement sensor 11 are all arranged in a spherical device 6, the spherical device 6 is arranged in a gas extraction pipeline 1 and moves in the gas extraction pipeline 1 under the action of extraction negative pressure; while the spherical device 6 moves in the gas extraction pipeline 1, monitoring the methane concentration C in the gas extraction pipeline 1, the flow Q in the pipeline, the distance d between the spherical device 6 and the inner wall of the gas extraction pipeline 1 and the movement displacement X of the spherical device 6 in real time through the methane sensor 8, the flow sensor 5, the ultrasonic distance sensor 7 and the displacement sensor 11; the system is simple in structure and convenient to use, the spherical device 6 is suitable for various underground gas extraction pipelines, real-time monitoring can be achieved, and no dead angle exists in the whole monitoring process.
Claims (7)
1. A method for intelligently monitoring the operation condition of a gas extraction pipeline is characterized by comprising the following steps:
the method comprises the following steps: the methane sensor (8), the flow sensor (5), the ultrasonic distance sensor (7) and the displacement sensor (11) are installed in the spherical device (6), the spherical device (6) is arranged in the gas extraction pipeline (1) and moves in the gas extraction pipeline (1) under the action of extraction negative pressure;
step two: while the spherical device (6) moves in the gas extraction pipeline (1), monitoring the methane concentration C in the gas extraction pipeline (1), the flow Q in the pipeline, the distance d between the spherical device (6) and the inner wall of the gas extraction pipeline (1) and the axial movement displacement X of the spherical device (6) in real time through a methane sensor (8), a flow sensor (5), an ultrasonic distance sensor (7) and a displacement sensor (11);
step three: and (4) transmitting the data monitored in the step (II) to a ground information processing terminal (3) in real time through wireless, and processing and analyzing the data through the ground information processing terminal (3), so as to monitor whether the gas extraction pipeline (1) is blocked or leaked.
2. The method for intelligently monitoring the operation condition of the gas extraction pipeline according to claim 1, wherein the method for judging whether the gas extraction pipeline (1) is blocked in the third step is as follows:
the method comprises the following steps: the distance d between the spherical device (6) and the inner wall of the gas extraction pipeline (1) is monitored in real time, and the numerical value of the distance d should satisfy the formula (1)
d＝h-d1(1)
In the formula: d is the distance between the spherical device and the inner wall of the gas extraction pipeline;
h is the pipe diameter of the gas extraction pipeline;
d1the diameter of a spherical device;
if the gas extraction pipeline is in a normal operation state and is not blocked, the distance d between the spherical device (6) and the inner wall of the gas extraction pipeline (1) is a constant, and if the gas extraction pipeline (1) is blocked, the distance d between the spherical device (6) and the inner wall of the gas extraction pipeline (1) is changed;
step two: when the spherical device (6) monitors that the distance d between the spherical device (6) and the inner wall of the gas extraction pipeline (1) is changedSimultaneously recording the axial displacement X of the spherical device (6) at the moment1When the distance d between the spherical device (6) and the inner wall of the gas extraction pipeline (1) is recovered to a normal value, the axial movement displacement X of the spherical device (6) at the moment is recorded2The length of the blockage of the gas extraction pipeline (1) caused by water accumulation and slag deposition (4) is X2-X1；
Step three: monitoring the distance d between the spherical device (6) and the inner wall of the gas extraction pipeline (1) and the length X of the blockage of the gas extraction pipeline (1) at the blockage position of the spherical device (6)2-X1Fitting to obtain the distance d between the spherical device (6) and the inner wall of the gas extraction pipeline (1) and the length X of the blockage of the gas extraction pipeline (1) caused by the accumulated water and the accumulated slag (4)2-X1D (x), the volume V of the blockage caused by the water accumulation and slag deposition (4)1Satisfy formula (2)
In the formula: v1The plugging volume of accumulated water and accumulated slag;
h is the pipe diameter of the gas extraction pipeline;
d1the diameter of a spherical device;
X2-X1is the plug length;
d is the distance between the spherical device and the inner wall of the gas extraction pipeline;
if the gas extraction pipeline (1) is not blocked, the volume of the gas extraction pipeline (1) at the section meets the formula (3)
Step four: according to V1And V2Determining the blockage degree of the gas extraction pipeline (1).
3. The method for intelligently monitoring the operation condition of the gas extraction pipeline according to claim 2, wherein the blockage of the gas extraction pipeline (1) in the fourth step is limitedDegree divided into slight blockage A3General blockage A2Severe clogging of A1Three levels, the grade division is according to the formula (4)
4. The method for intelligently monitoring the operation condition of the gas extraction pipeline according to claim 1, wherein the method for judging whether the gas extraction pipeline (1) leaks in the third step is as follows:
the method comprises the following steps: whether the extraction drill hole (10) leaks or not is determined through analysis and processing of the methane concentration C of 1m in front of and behind the joint of the gas extraction pipeline (1) and the water discharger (9) and the flow Q in the pipeline; taking a methane concentration C every 0.1miAnd pipe flow QjThe average concentration of methane at the front 1m of the joint and the average flow of the pipeline are respectively
The average concentration of methane at the rear 1m of the joint and the average flow of the pipeline are respectively
If a leak occurs then
Wherein
α＝ηβ；
Step two: the degree of leakage in step one is divided into three grades of light leakage B3, general leakage B2 and serious leakage B1The leakage grade is divided according to a formula (5), and the leakage monitoring of other positions of the gas extraction pipeline (1) is judged through the methane concentration monitored by the methane sensor (8) in real time; if the gas extraction pipeline (1) is not leaked, the methane concentration C in the gas extraction pipeline (1) is unchanged, namely C1＝C2＝…＝CnIf the pipeline leakage happens, external air leaks into the pipeline to dilute the methane concentration, the concentration is reduced, and the leakage grade is divided according to a formula (6)
5. The method for intelligently monitoring the operation condition of the gas extraction pipeline according to any one of claims 1 to 4, characterized in that an intrinsically safe power supply is arranged inside the spherical device (6), and the intrinsically safe power supply is used for supplying power to the methane sensor (8), the flow sensor (5), the ultrasonic distance sensor (7) and the displacement sensor (11).
6. The method for intelligently monitoring the operation condition of the gas extraction pipeline according to any one of claims 1 to 4, wherein the spherical device (6) is of an explosion-proof design.
7. The method for intelligently monitoring the operation condition of the gas extraction pipeline according to any one of claims 1 to 4, wherein the gas extraction pipeline (1) can be an iron pipe, a PE pipe, a PVC pipe or a glass fiber pipe.
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| CN116821845A (en) * | 2023-06-20 | 2023-09-29 | 郑州大学 | Pipeline siltation condition diagnosis method and device based on multi-sensor data fusion |
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| CN105065057A (en) * | 2015-07-23 | 2015-11-18 | 陕西煤业化工技术研究院有限责任公司 | Coal mine gas extraction parameter automatic regulating and controlling system and coal mine gas extraction parameter automatic regulating and controlling method |
| CN105401972A (en) * | 2015-09-02 | 2016-03-16 | 煤科集团沈阳研究院有限公司 | Coalbed methane safety extraction intelligent control system and control method |
| CN105757459A (en) * | 2016-03-02 | 2016-07-13 | 中国矿业大学 | Gas extraction pipe network parameter monitoring system and leaking point accurate positioning method |
| CN105822338A (en) * | 2016-03-18 | 2016-08-03 | 河南工程学院 | Coal-mine gas extraction control system and method |
| CN105927862A (en) * | 2016-04-21 | 2016-09-07 | 中国矿业大学 | Method for acoustically monitoring blockage of gas extraction pipeline |
| CN107830412A (en) * | 2017-10-30 | 2018-03-23 | 重庆科技学院 | The incomplete blocking position detecting system of pipeline and detection method |
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