CN210462475U - Defeated natural gas of pipe trace leaks continuous monitoring device based on detecting tube - Google Patents
Defeated natural gas of pipe trace leaks continuous monitoring device based on detecting tube Download PDFInfo
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Abstract
The utility model relates to a pipe-conveying natural gas trace leakage continuous monitoring device based on a detection pipe, which comprises a first filtering unit, wherein carrier gas containing leaked gas enters the first detection pipe through the first filtering unit and enters a second detection pipe through the second filtering unit; the first ends of the first detection tube and the second detection tube are also provided with a mark gas injection unit, and the mark gas output by the mark gas injection unit is used for marking the carrier gas entering the detection tubes; the second ends of the first detection pipe and the second detection pipe are respectively connected with the third filtering unit, the physical property detection unit and one end of a vacuum pump through a first electromagnetic valve, and the other end of the vacuum pump is connected with a gas analyzer through a flow control unit; the first electromagnetic valve, the physical property detection unit, the vacuum pump, the flow control unit and the gas analyzer are electrically connected with the programmable controller, and the programmable controller performs information interaction with the industrial control computer. The utility model discloses positioning accuracy is high.
Description
Technical Field
The utility model relates to a natural gas leakage monitoring technology field especially is about a defeated natural gas trace of pipe leaks continuous monitoring device based on detecting tube.
Background
The safety of natural gas pipelines is always the center of gravity for operation of pipeline enterprises. According to statistics, the pipeline accident rate of China is about 3.0 multiplied by 10 from 2010 to 2014-3/(km · a), 30 times Canada, 7 times USA, 12 times EU, the pipe safety is severe. In the statistics of pipeline accidents, the method is mainly divided into two categories: one kind is a tubeThe safety accidents caused by the leakage of the road are pipeline damages caused by third-party construction. However, limited by the development of pipeline leakage monitoring technology, the existing safety monitoring technology still has many defects, for example, the sound wave technology of the american ASI, although it is convenient to install and has high sensitivity, there is a certain false alarm condition and the installation cost is high; based on the mass/volume balance method, the cost is lower, but the sensitivity is poorer, and the false alarm and the false negative alarm are higher; although the leakage monitoring technology based on the optical fiber has high monitoring and positioning accuracy and quick response time, an excellent filtering algorithm is required, and the false alarm rate is high. The common defect of the technologies is that effective early warning cannot be carried out on early tiny leakage of the pipeline, and false alarm is easy to occur.
The leakage monitoring technology based on the detection tube is a leakage monitoring technology capable of capturing a small leakage amount. By means of the detection pipe for capturing trace leakage methane, the technology can find early tiny leakage of the pipeline, and positions leakage points through gas pressure, temperature and flow rate, so that the safety risk of pipeline leakage is controlled to be the earliest. Because the characteristic signal of the methane gas is directly measured, the false alarm rate is extremely low. The patent document with publication number CN103629533A discloses a device and a method for monitoring leakage of multiple parallel buried natural gas pipelines, the invention utilizes a power unit to pump multiple detection pipes into a negative pressure state, analyzes the gas condition in the detection pipes through laser emitting and receiving units respectively arranged at two ends of the detection pipes, pumps the gas in the detection pipes through a vacuum pump after abnormity is found, and performs analysis and positioning. The method can realize monitoring of external leakage, but the device is too complex, the detection tube needs to be trapped in a negative pressure state, the device needs a laser detection unit to monitor the state in the detection tube, and the cost is high. Patent document CN 103629536B discloses a device and a method for monitoring leakage of a natural gas pipeline, which realizes monitoring of leakage of a natural gas pipeline by combining a sensing cable with a semi-permeable detection pipe. The technology detects that natural gas permeating into a detection tube reacts with a resistor contained in a probe to generate a signal through a front-end probe consisting of a semi-permeable membrane detection tube and a sensing cable. The method has the disadvantage that if the pipeline leaks, the sensing cable contacting the leaked gas loses the monitoring function and needs to be replaced. Patent document No. CN203604997U discloses a buried gas pipeline leakage monitoring and alarming system. The system needs to form negative pressure in the detection tube, and the leakage state is monitored through detection control structures arranged at two ends of the detection tube. The method has the defects that the gas condition in the detection pipe cannot be continuously monitored, and the positioning precision is limited by independently depending on speed control and detection time difference. Patent document CN104359629A discloses a device and method for detecting and locating leakage, which uses a single laid detection tube to capture the leakage source, and uses the power system to carry the leakage source back to the detection unit, and then the leakage is detected and alarmed, and the leakage point can be located according to the time difference of signal detection and the speed of the power system. This method does not allow continuous monitoring of the leak condition, since there is only one detector tube.
In summary, many solutions and methods for pipeline leakage are proposed, however, none of these improvements completely solves the original problems, and the improvements bring new problems, so further research on pipeline leakage monitoring methods and technologies is necessary.
Disclosure of Invention
To the problem, the utility model aims at providing a defeated natural gas trace of pipe leaks continuous monitoring device based on detecting tube, its ordinary attitude detecting tube that utilizes the pipeline parallel to lay catches and leaks trace natural weather gas, utilizes the power pack to carry the carrier gas that contains trace natural gas and gets back to in the detecting element, comes to carry out the analysis to the carrier gas through the detecting element, and the discovery surpasss the detection threshold value and sends the leakage warning, detects in turn through two detecting tubes, realizes defeated natural gas pipeline's of geminate transistors continuous detection. The leakage point is positioned by utilizing the conservation of mass, and the positioning precision is improved.
In order to achieve the purpose, the utility model adopts the following technical proposal: a pipe-conveyed natural gas micro-leakage continuous monitoring device based on a detection pipe comprises a first filtering unit, a second filtering unit, a marking gas injection unit, a first detection pipe, a second detection pipe, a first electromagnetic valve, a third filtering unit, a physical property detection unit, a vacuum pump, a mass flow control unit, a gas analyzer, a programmable logic controller and an industrial control computer; the leakage gas of the natural gas pipeline is carried by carrier gas, and the carrier gas containing the leakage gas enters the first detection pipe through the first filtering unit and enters the second detection pipe through the second filtering unit; the first ends of the first detection tube and the second detection tube are also provided with the identification gas injection unit, and the identification gas output by the identification gas injection unit is used for identifying the carrier gas entering the detection tubes; the second ends of the first detection pipe and the second detection pipe are respectively connected with the third filtering unit, the physical property detection unit and one end of a vacuum pump through the first electromagnetic valve, and the other end of the vacuum pump is connected with the gas analyzer through the flow control unit; the first electromagnetic valve, the physical property detection unit, the vacuum pump, the flow control unit and the gas analyzer are electrically connected with the programmable controller, and the programmable controller is in information interaction with the industrial control computer.
Further, a second electromagnetic valve is arranged between the first filtering unit and the first end of the first detection pipe, a third electromagnetic valve is arranged between the second filtering unit and the first end of the second detection pipe, and a fourth electromagnetic valve is arranged between the first end of the first detection pipe and the first end of the second detection pipe in parallel; and the second electromagnetic valve, the fourth electromagnetic valve and the third electromagnetic valve are all electrically connected with the programmable controller.
Furthermore, a fifth electromagnetic valve is arranged at an outlet of the marker gas injection unit, and the outlet of the marker gas injection unit is respectively connected with the first end of the first detection pipe and the first end of the second detection pipe through the fifth electromagnetic valve; the fourth electromagnetic valve is electrically connected with the programmable controller.
Further, the first detection pipe and the second detection pipe are used for trapping leakage gas and arranged in parallel with the natural gas pipeline, and the two detection pipes are located in the 12 o' clock direction of the natural gas pipeline.
Further, the first detection tube and the second detection tube are both air-tight hoses, and both the first detection tube and the second detection tube comprise permeation film layers.
Further, the gas analyzer includes a gas sensor for carrier gas component analysis.
Further, the gas sensor is a laser type sensor, an infrared spectrum type sensor or a semiconductor type gas sensor.
The utility model discloses owing to take above technical scheme, it has following advantage: 1. the utility model discloses on the basis of the state detection pipe that has trace natural gas entrapment function, through selecting the thickness of two intraductal infiltration retes that detect for the detection pipe can realize leaking gaseous entrapment to the trace under the ordinary pressure environment. 2. The utility model discloses an use 2 sense tubes to switch, realize the continuous monitoring to natural gas line leakage state. 3. The utility model discloses a set for and leak the threshold value and judge, can realize that the gaseous leakage of trace is reported to the police. 4. The utility model discloses an use the positioning algorithm based on conservation of mass, can carry out more accurate survey to the leakage point. 5. The utility model discloses a device has the characteristics that detect sensitivity height, positioning accuracy are good, the wrong report rate is low, can monitor in succession, flexible operation, can realize the small leakage monitoring ability of low to tens of liters per hour to natural gas line, can discover pipeline seepage or early leakage. To sum up, the utility model discloses can extensively use in natural gas leakage monitoring technical field.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Detailed Description
In the description of the present invention, it is to be understood that the terms "front", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience of description of the present invention and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The present invention will be described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the utility model provides a defeated natural gas trace leaks continuous monitoring device based on detecting tube, it includes first filter unit 1, second filter unit 3, second solenoid valve 15, fourth solenoid valve 17, third solenoid valve 16, fifth solenoid valve 18, sign gas injection unit 5, first detecting tube 2, second detecting tube 4, first solenoid valve 6, third filter unit 7, rerum natura detecting element 8, vacuum pump 9, mass flow control unit 10, gas analysis appearance 11, programmable controller 12 and industrial computer 13.
The leakage gas of the natural gas pipeline 14 is carried by carrier gas, and the carrier gas containing the leakage gas enters the first detection pipe 2 through the first filtering unit 1 and enters the second detection pipe 4 through the second filtering unit 3; and the first ends of the first detection pipe 2 and the second detection pipe 4 are also provided with a mark gas injection unit 5, and the mark gas output by the mark gas injection unit 5 is used for marking the carrier gas entering the detection pipes. The second ends of the first detection tube 2 and the second detection tube 4 are respectively connected with one end of a third filtering unit 7, a physical property detection unit 8 and a vacuum pump 9 through a first electromagnetic valve 6, carrier gas is discharged after being filtered by the third filtering unit 7, the carrier gas is subjected to pressure, temperature, density and other detection through the physical property detection unit 8, and the parameters provide an original data basis for a mass conservation positioning method. The first detection pipe 2 and the second detection pipe 4 are vacuumized through the vacuum pump 9, the vacuum degree of an inlet at the first end of the detection pipe is controlled to be 5-95 kPa, the other end of the vacuum pump 9 is connected with the gas analyzer 11 through the flow control unit 10, and the leakage monitoring of the natural gas pipeline 1 can be realized through continuous detection of carrier gas of the detection pipe through the gas analyzer 11. The first electromagnetic valve 6, the physical property detection unit 8, the vacuum pump 9, the flow control unit 10 and the gas analyzer 11 are all electrically connected with the programmable controller 12, and the programmable controller 12 and the industrial computer 13 perform information interaction.
In the above embodiment, the second solenoid valve 15 is disposed between the first filtering unit 1 and the first end of the first detecting tube 2, the third solenoid valve 16 is disposed between the second filtering unit 3 and the first end of the second detecting tube 4, and the fourth solenoid valve 17 is disposed between the first end of the first detecting tube 2 and the first end of the second detecting tube 4 in parallel. The second solenoid valve 15, the fourth solenoid valve 17 and the third solenoid valve 16 are all electrically connected to the programmable controller 12.
In the above embodiments, the fifth electromagnetic valve 18 is disposed at the outlet of the marker gas injection unit 5, and the outlet of the marker gas injection unit 5 is connected to the first end of the first detection tube 2 and the first end of the second detection tube 4 through the fifth electromagnetic valve 18. The fifth solenoid valve 18 is electrically connected to the programmable controller 12.
In the above embodiments, the carrier gas may be air, nitrogen or other non-interference gas.
In the above embodiments, both the first filtering unit 1 and the second filtering unit 3 can adopt membrane filtration or activated carbon filter, which controls the normal pressure dew point of the carrier gas to be less than-40 ℃ and does not contain solid particles.
In the above embodiments, the marker gas injection unit 5 may adopt a characteristic marker gas storage device, and the marker gas may be a hydrocarbon gas of C2 or above and H2Or CO at a concentration of 1 to 5% (v/v).
In the above embodiments, the first detection pipe 2 and the second detection pipe 4 are both used for capturing leakage gas and arranged in parallel with the natural gas pipeline 14, and both the two detection pipes are located in the 12 o' clock direction of the natural gas pipeline 14 and are located 0-30 cm directly above the natural gas pipeline 14. The first detection pipe 2 and the second detection pipe 4 both adopt air tightness hoses, and leakage methane and other key components need to be guaranteed to enter the detection pipes under certain driving force. The first detection tube 2 and the second detection tube 4 both comprise a permeation film layer, and the thickness of the permeation film is 0.5-2 mm; the detection tube can trap a trace amount of leaked methane gas under normal pressure depending on the preferable film material and film thickness.
In the above embodiments, the flow control unit 10 includes a flow controller and a flow meter, and is used to precisely control the carrier gas flow, and the gas flow rate is generally 0.1-6 m/s.
In each of the above examples, gas analysisThe instrument 11 is used for analyzing and detecting the content of the carrier gas component, and transmitting the detection result to the industrial computer 13 through the programmable controller 12. The gas analyzer 11 includes a gas sensor for carrier gas component analysis, which may be a laser type sensor, an infrared spectrum type sensor, or a semiconductor type gas sensor. The gas to be measured comprises methane, C2+ and H2And gases such as CO.
Based on the device, the utility model also provides a defeated natural gas trace leaks continuous monitoring method based on detecting tube, and the mode is changed including self-checking mode, detection mode, data analysis mode, continuous monitoring operation mode and filter to this method, specifically is:
(1) self-checking mode: the states of the first to fifth electromagnetic valves are confirmed, the fourth electromagnetic valve 17 is in a cut-off state before opening, the second electromagnetic valve 15 and the third electromagnetic valve 16 are in an open state, and the first detection pipe 2 and the second detection pipe 4 are ensured to be in a state that the internal pressure and the external pressure are in a balance state. The fifth solenoid valve 18 is in a closed state.
(2) Detection mode: and (3) detecting by adopting the first detecting pipe 2, closing the fourth electromagnetic valve 17, opening the second electromagnetic valve 15 and the third electromagnetic valve 16, controlling the first electromagnetic valve 6 to enable the first detecting pipe 2 to be communicated with the vacuum pump 9, and enabling the second detecting pipe 4 to be communicated with the third filtering unit 7. And controlling the fifth electromagnetic valve 18 to communicate the marker gas injection unit 5 with the first detection pipe 2, and closing the fifth electromagnetic valve 18 after injecting the preset amount of the marker gas into the first detection pipe 2, wherein the process is usually very short and lasts for 0.5 s. The vacuum pump 9 and the mass flow control unit 10 were started to control the flow rate of the gas flowing out of the detection tube to 1 m/s. The physical property detection unit 8 collects the temperature, pressure and density data of the detected gas, and the gas analyzer 11 continuously collects CH in the carrier gas4、H2Or other characteristic gas concentration data, and communicates the data to programmable controller 12. Through the continuous switching of the two detection pipes, the continuous detection of the leakage of the natural gas pipeline is realized.
(3) Data analysis mode: the programmable controller 12 analyzes the collected and recorded physical property, process and component concentration data, and outputs the data to the industrial computer 13 for display in real time after filtering, noise reduction and normalization processing. The user carries out background removal on the daily monitoring signal according to the background signal intensity along the pipeline, sets a lowest signal alarm threshold value, and when the monitoring signal exceeds the alarm signal threshold value, the system gives an alarm. According to the monitored gas mass flow, the gas temperature and the gas pressure before monitoring, the gas flow is converted into the distance with the corresponding length, the position of the leakage point is further inversely calculated, and the position of the first derivative zero point of the leakage signal curve is solved to determine the leakage point. The distance of monitoring back calculation is checked through the existing physical length of the pipeline, and the distance of locating point back calculation is corrected through the checking coefficient.
And analyzing the state of the natural gas pipeline 14 according to the data acquired and recorded by the programmable controller 12, alarming the leakage condition and positioning the leakage point. After comparing the multiple groups of detection signals with historical data, performing trend analysis and judgment on the signals exceeding the detection threshold value, and sending out a leakage alarm. According to the physical property detection data and the flow data of the carrier gas, the leakage point is predicted according to a mass conservation positioning method by combining the running time difference of the device, and meanwhile, the characteristic gas is released to perform secondary positioning at a test pile with a known physical distance to reduce the positioning error, wherein the positioning error is less than 10 m/km.
The mass conservation positioning method comprises the steps of measuring physical property state parameters of carrier gas, reversely calculating the distance of the extracted carrier gas according to the same mass and the same volume, and determining the position of a leakage point. Compared with a method for measuring and calculating the leakage distance according to the flow velocity, the method is high in precision.
(4) Continuous monitoring mode of operation: after the gas analyzer 11 detects the marker gas signal indicating that the distance is over, the fifth electromagnetic valve 18 is started to inject the marker gas into the second detection pipe 4, the first electromagnetic valve 6 is started, the second detection pipe 4 is communicated with the vacuum pump 9, and the first detection pipe 2 is communicated with the third filtering unit 7. The detection operation is repeated.
(5) Filter replacement mode, the first filter unit 1 is replaced online: the fourth electromagnetic valve 17 is opened, the second electromagnetic valve 15 is closed, the first filtering unit 1 can be replaced on line, and after the replacement is finished, the second electromagnetic valve 15 is opened and the fourth electromagnetic valve 17 is closed. The online replacement operation of the second filter unit 3 is identical to that of the first filter unit 1, and will not be described in detail herein.
To sum up, the utility model has the characteristics of it is high to detect sensitivity, positioning accuracy is good, the wrong report rate is low, can monitor in succession, flexible operation, can realize that natural gas line hangs down to the monitoring capability of tens liters of small leakage per hour, can discover pipeline seepage or early leakage, to prevention pipeline accident, it has great meaning to maintain pipeline safety.
Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that these are merely examples and that the scope of the present invention is defined by the appended claims, and that various changes and modifications may be made to these embodiments by those skilled in the art without departing from the principle and spirit of the present invention, but these changes and modifications are all within the scope of the present invention.
Claims (7)
1. The utility model provides a defeated natural gas trace leaks continuous monitoring device based on detecting tube which characterized in that: the device comprises a first filtering unit, a second filtering unit, a marking gas injection unit, a first detection pipe, a second detection pipe, a first electromagnetic valve, a third filtering unit, a physical property detection unit, a vacuum pump, a mass flow control unit, a gas analyzer, a programmable controller and an industrial computer;
the leakage gas of the natural gas pipeline is carried by carrier gas, and the carrier gas containing the leakage gas enters the first detection pipe through the first filtering unit and enters the second detection pipe through the second filtering unit; the first ends of the first detection tube and the second detection tube are also provided with the identification gas injection unit, and the identification gas output by the identification gas injection unit is used for identifying the carrier gas entering the detection tubes; the second ends of the first detection pipe and the second detection pipe are respectively connected with the third filtering unit, the physical property detection unit and one end of a vacuum pump through the first electromagnetic valve, and the other end of the vacuum pump is connected with the gas analyzer through the flow control unit; the first electromagnetic valve, the physical property detection unit, the vacuum pump, the flow control unit and the gas analyzer are electrically connected with the programmable controller, and the programmable controller is in information interaction with the industrial control computer.
2. The apparatus of claim 1, wherein: a second electromagnetic valve is arranged between the first filtering unit and the first end of the first detection pipe, a third electromagnetic valve is arranged between the second filtering unit and the first end of the second detection pipe, and a fourth electromagnetic valve is arranged between the first end of the first detection pipe and the first end of the second detection pipe in parallel; and the second electromagnetic valve, the fourth electromagnetic valve and the third electromagnetic valve are all electrically connected with the programmable controller.
3. The apparatus of claim 2, wherein: a fifth electromagnetic valve is arranged at the outlet of the identification gas injection unit, and the outlet of the identification gas injection unit is respectively connected with the first end of the first detection pipe and the first end of the second detection pipe through the fifth electromagnetic valve; the fourth electromagnetic valve is electrically connected with the programmable controller.
4. The apparatus of claim 1, wherein: the first detection pipe and the second detection pipe are used for trapping leakage gas and arranged in parallel with the natural gas pipeline, and the two detection pipes are located in the 12 o' clock direction of the natural gas pipeline.
5. The apparatus of claim 1, wherein: the first detection tube and the second detection tube are both air-tight hoses, and both the first detection tube and the second detection tube contain permeation film layers.
6. The apparatus of claim 1, wherein: the gas analyzer includes a gas sensor for carrier gas component analysis.
7. The apparatus of claim 6, wherein: the gas sensor is a laser sensor, an infrared spectrum sensor or a semiconductor type gas sensor.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110319351A (en) * | 2019-07-18 | 2019-10-11 | 中海石油气电集团有限责任公司 | Pipeline gas micro-leakage continuous monitoring method and device based on detection pipe |
| CN114017687A (en) * | 2021-12-14 | 2022-02-08 | 合肥航谱时代科技有限公司 | Chemical gas leakage detection device |
| CN114607944A (en) * | 2022-02-24 | 2022-06-10 | 之江实验室 | Natural gas pipeline leakage monitoring device and method |
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2019
- 2019-07-18 CN CN201921134982.8U patent/CN210462475U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110319351A (en) * | 2019-07-18 | 2019-10-11 | 中海石油气电集团有限责任公司 | Pipeline gas micro-leakage continuous monitoring method and device based on detection pipe |
| CN110319351B (en) * | 2019-07-18 | 2024-04-30 | 中海石油气电集团有限责任公司 | Method and device for continuously monitoring trace leakage of pipeline natural gas based on detection pipe |
| CN114017687A (en) * | 2021-12-14 | 2022-02-08 | 合肥航谱时代科技有限公司 | Chemical gas leakage detection device |
| CN114607944A (en) * | 2022-02-24 | 2022-06-10 | 之江实验室 | Natural gas pipeline leakage monitoring device and method |
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