CN210266734U - Gas pipeline leakage monitoring device capable of adjusting monitoring distance - Google Patents
Gas pipeline leakage monitoring device capable of adjusting monitoring distance Download PDFInfo
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- CN210266734U CN210266734U CN201921134981.3U CN201921134981U CN210266734U CN 210266734 U CN210266734 U CN 210266734U CN 201921134981 U CN201921134981 U CN 201921134981U CN 210266734 U CN210266734 U CN 210266734U
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Abstract
The utility model relates to a gas pipeline leakage monitoring device of adjustable monitoring distance, it includes the filter unit, the exit end of filter unit is connected with the entry end of detecting tube through the air compressor machine, the gas pipeline's leakage gas gets into the detecting tube that is used for catching the leakage gas through filter unit and air compressor machine, the exit end of filter unit is connected with the sign gas injection unit exit end through the pipeline, the exit end of detecting tube is connected with vacuum pump one end, the other end of vacuum pump is connected with quality flow control unit one end through rerum natura detecting element, the quality flow control unit other end is connected with gas analysis appearance one end, the gas analysis appearance other end is the evacuation end; the air compressor, the vacuum pump, the physical property detection unit, the mass flow control unit and the gas analyzer are all electrically connected with the programmable controller, and the programmable controller is in information interaction with the industrial control computer. The utility model discloses can realize the intermittent type leakage monitoring to long distance pipeline, can extensively use in gas pipeline leakage monitoring technical field.
Description
Technical Field
The utility model relates to a gas pipeline leakage monitoring technical field especially is about a gas pipeline leakage monitoring device of adjustable monitoring distance.
Background
Gas pipeline leakage is a major hidden trouble in pipeline safety operation, and pipelines are often required to be regularly inspected by pipeline operation enterprises for this reason. However, manual inspection often cannot find tiny leakage of the pipeline, and is time-consuming and labor-consuming. In order to reduce the risk of safe operation of the pipeline, enterprises often install leakage monitoring facilities to ensure the safe state of the pipeline. The monitoring system for capturing the leaked gas based on the detection tube can identify the leaked gas and has higher accuracy and sensitivity. However, in the past, a vacuum pump is often used as a power source of a monitoring system for capturing leakage gas based on a detection pipe, a negative pressure state needs to be maintained in the detection pipe, the maximum differential pressure of the negative pressure power system is about 1bar, the pipeline distance which can be monitored at one time is usually short, the station spacing of long-distance pipeline, especially long-distance natural gas pipeline, can reach 30-40km, and the negative pressure type leakage monitoring method cannot reach the long-distance monitoring target.
For example, the buried pipeline leakage monitoring alarm systems disclosed in patent documents with publication numbers CN 203604997U, CN104359629A, CN102518948B and CN103244833B are all negative pressure type systems. 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. Currently, the disclosed leakage monitoring system based on the detection tube has no positive pressure system.
Disclosure of Invention
To the problem, the utility model aims at providing a gas pipeline leakage monitoring device of adjustable monitoring distance, it adopts positive negative die mould driving system, with two kinds of power mode integration in the system, can adjust monitoring mode and power mode according to the monitoring distance, convenient nimble, the biggest monitoring distance can reach 40 km. And under different monitoring modes, a specific leakage identification mode and a specific positioning mode are set, and the method has good adaptability to the leakage of long-distance and short-distance gas pipelines.
In order to achieve the purpose, the utility model adopts the following technical proposal: a gas pipeline leakage monitoring device capable of adjusting a monitoring distance comprises a filtering unit, an air compressor, a detection pipe, a marking gas injection unit, a vacuum pump, a physical property detection unit, a mass flow control unit, a gas analyzer, a programmable logic controller and an industrial computer; the outlet end of the filter unit is connected with the inlet end of the detection pipe through the air compressor, leaked gas of a gas pipeline sequentially passes through the filter unit and the air compressor and enters the detection pipe for capturing the leaked gas, the outlet end of the filter unit is connected with the outlet end of the identification gas injection unit through a pipeline, the outlet end of the detection pipe is connected with one end of the vacuum pump, the other end of the vacuum pump is connected with one end of the mass flow control unit through the physical property detection unit, the other end of the mass flow control unit is connected with one end of the gas analyzer, and the other end of the gas analyzer is a release end; the air compressor, the vacuum pump, the physical property detection unit, the mass flow control unit and the gas analyzer are all electrically connected with the programmable controller, and the programmable controller is in information interaction with the industrial control computer.
Further, the detection pipe is arranged in parallel with the gas pipeline and is positioned right above the gas pipeline.
Furthermore, a solenoid valve is arranged on a pipeline at the outlet end of the identification gas injection unit and electrically connected with the programmable controller.
Further, the inner diameter of the detection tube is 15-20 mm, and the detection tube comprises an inner supporting layer, a middle permeation film layer and an outer weaving layer.
Furthermore, the thickness of the middle permeating film layer is 0.4-1 mm.
Furthermore, the monitoring mileage of the detection pipe corresponding to the vacuum pump is less than 15km, and the monitoring mileage corresponding to the air compressor is within a range of more than 15 km; when the vacuum pump is used as a power unit for pumping, the vacuum degree of the inlet is controlled to be 20-95 kPa, and when the air compressor is used as a power unit for pushing carrier gas, the pressure range of the outlet is 0.5-10 bar.
Further, the gas analyzer 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 an install air compressor machine and vacuum pump respectively as system's power at test tube entry end and exit end, constitute positive negative pressure driving system, according to test tube monitoring distance, select the leakage monitoring mode that corresponds, realize short distance negative pressure continuous monitoring mode and long distance malleation intermittent type monitoring mode. 2. The utility model discloses a thin wall test tube realizes leaking gaseous entrapment to the trace. The defect that the monitoring distance of a pure negative pressure power system is short is overcome, and the range of the primary monitoring distance based on the detection tube leakage monitoring system is enlarged. 3. The utility model discloses can realize the small leakage monitoring ability of low to tens of liters per hour to gas pipeline, can discover different distance pipeline seepage or early leakage. 4. The utility model discloses a set up peculiar positive negative pressure driving system, can enlarge to about 40km with single equipment leakage monitoring distance. According to the monitoring distance range, the operation mode and the leakage monitoring algorithm are determined, continuous monitoring can be carried out aiming at short distance, and intermittent leakage monitoring of a long-distance pipeline can be realized through the device. To sum up, the utility model discloses to prevention pipeline accident, it has great meaning to maintain pipeline safety, can extensively use in gas pipeline 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 figure 1, the utility model provides a gas pipeline leakage monitoring device of adjustable monitoring distance, the device can carry out gas pipeline such as leakage monitoring's pipeline for natural gas, hydrogen, propane, ethylene or chlorine. The utility model discloses a filter unit 1, air compressor machine 2, detecting tube 3, sign gas injection unit 4, vacuum pump 5, rerum natura detecting element 6, mass flow control unit 7, gas analysis appearance 8, programmable controller 9 and industrial computer 10.
The exit end of filter unit 1 is connected with the entry end of test tube 3 through air compressor machine 2, and the gas pipeline 11 reveals that gas gets into the test tube 3 that is used for catching leaking gas through filter unit 1 and air compressor machine 2 in proper order, and test tube 3 and gas pipeline 11 parallel arrangement are located directly over gas pipeline 11. The outlet end of the filtering unit 1 is connected with the outlet end of the identification gas injection unit 4 through a pipeline, and the identification gas output by the identification gas injection unit 4 is used for identifying the carrier gas entering the detection tube 3. The outlet end of the detection tube 3 is connected with one end of a vacuum pump 5, the other end of the vacuum pump 5 is connected with one end of a mass flow control unit 7 through a physical property detection unit 6, the other end of the mass flow control unit 7 is connected with one end of a gas analyzer 8, and the other end of the gas analyzer 8 is an emptying end; the air compressor 2 and the vacuum pump 5 form a positive-negative pressure power system, and the physical property detection unit 6 is used for testing the physical properties such as pressure, temperature, density and the like of carrier gas flowing out of the detection pipe 3. The air compressor 2, the vacuum pump 5, the physical property detection unit 6, the mass flow control unit 7 and the gas analyzer 8 are electrically connected with the programmable controller 9, and the programmable controller 9 and the industrial control computer 10 perform information interaction; the programmable controller 9 collects initial data such as physical data, characteristic gas concentration data, flow rate data and the like and uploads the initial data to the industrial computer 10, and the industrial computer 10 completes the functions of system leakage alarm and leakage point positioning according to a pre-installed carrier gas real-time analysis system and a leakage positioning system.
In the above embodiment, the pipeline at the outlet end of the marker gas injection unit 4 is provided with an electromagnetic valve, and the electromagnetic valve is electrically connected with the programmable controller 9.
In the above embodiments, the inner diameter of the detection tube 3 is 15-20 mm, and the detection tube 3 is a multi-layer composite hose, and includes an inner support layer, a middle permeable membrane layer and an outer braided layer. Wherein the thickness of the middle permeation film layer is 0.4-1 mm.
In the above embodiments, the air compressor 2 and the vacuum pump 5 in the positive-negative pressure power system correspond to different monitoring mileage ranges. The monitoring mileage of the detection pipe corresponding to the vacuum pump 5 is less than 15km, and the monitoring mileage of the air compressor 2 is within a range of more than 15 km. When the vacuum pump 5 is used as a power unit for pumping, the vacuum degree of the inlet is controlled to be 20-95 kPa. When the air compressor 2 is used as a power unit to push carrier gas, the outlet pressure range is 0.5-10 bar.
In the above embodiments, the mass flow control unit 7 includes a flow controller and a flow meter, which can precisely control the flow rate, and the flow rate of the control gas is generally 0.5-3 m/s.
In the above embodiments, the gas analyzer 8 may be a laser sensor, an infrared spectrum sensor, or a semiconductor type gas sensor with sensitive reaction according to the characteristics of the gas to be monitored.
In the above embodiments, the marker gas in the marker gas injection unit 4 should be different from the monitored gas in the detection tube 3, so as to distinguish the termination signal.
Based on above-mentioned monitoring devices, the utility model also provides a gas pipeline leakage monitoring method of adjustable monitoring distance, it includes short distance leakage monitoring mode and long distance leakage monitoring mode, and two kinds of modes all operate based on gas pipeline leakage monitoring device. Wherein:
the short-distance leakage monitoring mode is as follows:
1) the filter unit 1 is connected to the venting end of the gas analyzer 8. The marker gas injection means 4 is controlled to inject a predetermined amount of marker gas into the detection tube 3.
2) The vacuum pump 5 was turned on, and the flow rate of the carrier gas was controlled to be about 2m/s by controlling the mass flow control means 7. Meanwhile, the physical property detection unit 6, the mass flow control unit 7 and the gas analyzer 8 start recording data and upload related data to the industrial personal computer 11.
3) The external gas of the detection tube 3 enters the detection tube 3 through diffusion, the carrier gas detects the carrier gas with the leakage gas through a gas analyzer 8 under the pumping action of a vacuum pump 5, and whether the leakage occurs is determined by analyzing the variation gradient of the concentration of the leakage gas in the carrier gas: when the concentration variation of the leaked gas reaches a set lower limit of triggering leakage alarm, leakage alarm occurs; the position of the leakage point is positioned through the relation between the flow speed and the detection time, the total monitoring length is determined through identifying the gas signal, and the leakage position is corrected.
The long-distance leakage monitoring mode is as follows: the long distance leak monitoring mode operation is identical to the short distance leak monitoring mode operation, and the power unit is changed from the vacuum pump 5 to the air compressor 2. Meanwhile, in the long-distance monitoring mode, an intermittent monitoring mode is adopted, and the outlet flow rate is controlled to be 0.5m/s by controlling the pressure of the air compressor 2. The carrier gas with the leakage gas is detected by a gas analyzer 8 under the external pressure of the air compressor 2, and whether the leakage occurs is determined by analyzing the peak value of the concentration of the leakage gas in the carrier gas. And when the concentration peak value of the leaked gas reaches the set lower limit of the leakage alarm, the leakage alarm occurs. And the position of the leakage point is inversely calculated according to the physical property and mass conservation of the gas, the total monitoring length is determined by identifying the gas signal, and the leakage position is corrected.
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.
To sum up, the utility model discloses when using, at first can carry out the selection of monitoring mode according to the detection distance. For the condition that the monitoring distance is less than 15km, a vacuum leakage monitoring mode, namely a short-distance leakage monitoring mode, is automatically selected, a vacuum pump 5 is selected for a power system, a continuous monitoring mode can be adopted, the vacuum pump 5 continuously transports carrier gas, a gas analyzer 8 detects the monitored gas in the carrier gas, when the concentration change of the monitored gas exceeds an alarm set threshold value, a leakage alarm is triggered, and the position of a leakage point is determined according to the relation between the flow data detected by a flow controller and time.
When the monitoring distance is larger than 15km, the system is changed into a positive pressure type leakage monitoring mode, namely a long-distance leakage monitoring mode, the power system selects the air compressor 2, intermittent operation is adopted, the air compressor 2 starts to be started after the detection pipe is kept in a normal pressure state at a certain time interval, preset pressure is maintained, the outlet flow of the detection pipe 3 is kept stable, the gas analyzer 8 detects the concentration of leaked gas, when the concentration peak value reaches or exceeds a set alarm threshold value, the system sends out a leakage alarm, and the leakage point is positioned by combining physical property data measured by the physical property detection unit with mass conservation.
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 gas pipeline leakage monitoring device of adjustable monitoring distance which characterized in that: the device comprises a filtering unit, an air compressor, a detection pipe, a marking gas injection unit, a vacuum pump, a physical property detection unit, a mass flow control unit, a gas analyzer, a programmable logic controller and an industrial computer;
the outlet end of the filter unit is connected with the inlet end of the detection pipe through the air compressor, leaked gas of a gas pipeline sequentially passes through the filter unit and the air compressor and enters the detection pipe for capturing the leaked gas, the outlet end of the filter unit is connected with the outlet end of the identification gas injection unit through a pipeline, the outlet end of the detection pipe is connected with one end of the vacuum pump, the other end of the vacuum pump is connected with one end of the mass flow control unit through the physical property detection unit, the other end of the mass flow control unit is connected with one end of the gas analyzer, and the other end of the gas analyzer is a release end; the air compressor, the vacuum pump, the physical property detection unit, the mass flow control unit and the gas analyzer are all 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: the detection pipe and the gas pipeline are arranged in parallel and are positioned right above the gas pipeline.
3. The apparatus of claim 1, wherein: and the pipeline at the outlet end of the identification gas injection unit is provided with an electromagnetic valve which is electrically connected with the programmable controller.
4. The apparatus of claim 1, wherein: the inner diameter of the detection tube is 15-20 mm, and the detection tube comprises an inner supporting layer, a middle permeation film layer and an outer weaving layer.
5. The apparatus of claim 4, wherein: the thickness of the middle permeable membrane layer is 0.4-1 mm.
6. The apparatus of claim 1, wherein: the monitoring mileage of the detection pipe corresponding to the vacuum pump is less than 15km, and the monitoring mileage corresponding to the air compressor is in a range of more than 15 km; when the vacuum pump is used as a power unit for pumping, the vacuum degree of the inlet is controlled to be 20-95 kPa, and when the air compressor is used as a power unit for pushing carrier gas, the pressure range of the outlet is 0.5-10 bar.
7. The apparatus of claim 1, wherein: the gas analyzer is a laser type sensor, an infrared spectrum type sensor or a semiconductor type gas sensor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921134981.3U CN210266734U (en) | 2019-07-18 | 2019-07-18 | Gas pipeline leakage monitoring device capable of adjusting monitoring distance |
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| CN201921134981.3U CN210266734U (en) | 2019-07-18 | 2019-07-18 | Gas pipeline leakage monitoring device capable of adjusting monitoring distance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110296324A (en) * | 2019-07-18 | 2019-10-01 | 中海石油气电集团有限责任公司 | A kind of the gas pipe leakage monitoring method and device of adjustable monitoring distance |
| 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 |
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2019
- 2019-07-18 CN CN201921134981.3U patent/CN210266734U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110296324A (en) * | 2019-07-18 | 2019-10-01 | 中海石油气电集团有限责任公司 | A kind of the gas pipe leakage monitoring method and device of adjustable monitoring distance |
| CN110296324B (en) * | 2019-07-18 | 2024-02-06 | 中海石油气电集团有限责任公司 | Gas pipeline leakage monitoring method and device capable of adjusting monitoring distance |
| 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 |
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