CN112197177B - Pipeline leakage point positioning device based on oxygen measurement method and detection positioning method thereof - Google Patents
Pipeline leakage point positioning device based on oxygen measurement method and detection positioning method thereof Download PDFInfo
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- CN112197177B CN112197177B CN202011111032.0A CN202011111032A CN112197177B CN 112197177 B CN112197177 B CN 112197177B CN 202011111032 A CN202011111032 A CN 202011111032A CN 112197177 B CN112197177 B CN 112197177B
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 239000001301 oxygen Substances 0.000 title claims abstract description 60
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000000691 measurement method Methods 0.000 title claims abstract description 13
- 238000001514 detection method Methods 0.000 title abstract description 17
- 238000012545 processing Methods 0.000 claims abstract description 45
- 230000005540 biological transmission Effects 0.000 claims abstract description 26
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 60
- 230000001105 regulatory effect Effects 0.000 claims description 53
- 229910052757 nitrogen Inorganic materials 0.000 claims description 26
- 238000009434 installation Methods 0.000 claims description 19
- 230000000087 stabilizing effect Effects 0.000 claims description 17
- 239000007789 gas Substances 0.000 claims description 11
- 238000010926 purge Methods 0.000 claims description 10
- 230000035772 mutation Effects 0.000 claims description 9
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention belongs to the technical field of pipeline leakage point detection and positioning, and in particular relates to a pipeline leakage point positioning device based on an oxygen measurement method and a detection and positioning method thereof, comprising the following steps: a pipeline upstream device A, a pipeline downstream device B and a data acquisition processing device C; the data acquisition processing device C comprises: the system comprises a data converter, a data acquisition processing computer and a plurality of transmission cables; the data converter is connected with the data acquisition and processing computer through a transmission cable, the pipeline upstream device A is connected with the data converter of the data acquisition and processing device C through a transmission cable, and the pipeline downstream device B is connected with the data converter of the data acquisition and processing device C through a transmission cable.
Description
Technical Field
The invention belongs to the technical field of pipeline leakage point detection and positioning, and particularly relates to a pipeline leakage point positioning device based on an oxygen measurement method and a detection and positioning method thereof.
Background
At present, the method for detecting and positioning the leakage of the long-distance pipeline in the power industry is less, and particularly for the pipeline which is buried and is inaccessible in a high-altitude area, the detection of the leakage point of the pipeline is more difficult, so that the design of a safe and reliable leakage point positioning device and a leakage point detection method for positioning the leakage point of the pipeline is urgently needed in the industry at present so as to solve the technical problems.
Disclosure of Invention
The invention aims to design a pipeline leakage point positioning device based on an oxygen measurement method and a detection positioning method thereof, which are used for solving the technical problem that the position of a leakage point cannot be detected on a long-distance pipeline which is buried or is unreachable in a high-altitude area in the prior art, and can clearly orient the defect treatment work of the subsequent pipeline and reduce the workload.
The technical scheme of the invention is as follows:
A pipeline leakage point positioning device based on an oxygen measuring method comprises: a pipeline upstream device A, a pipeline downstream device B and a data acquisition processing device C; the data acquisition processing device C comprises: the system comprises a data converter, a data acquisition processing computer and a plurality of transmission cables; the data converter is connected with the data acquisition and processing computer through a transmission cable, the pipeline upstream device A is connected with the data converter of the data acquisition and processing device C through a transmission cable, and the pipeline downstream device B is connected with the data converter of the data acquisition and processing device C through a transmission cable.
The pipe upstream device a includes: the device comprises a nitrogen gas source, a pressure stabilizing tank, a pressure gauge A, a flow regulating valve A, a flow transmitter A, a stop switch A, a reference leakage point installation preformed hole, a connecting flange A and a plurality of pressure-bearing hoses; the nitrogen source is connected with one end of the pressure stabilizing tank through a pressure-bearing hose, and the other end of the pressure stabilizing tank is sequentially connected with the pressure gauge A, the flow regulating valve A, the flow transmitter A and the cut-off switch A in series; the stop switch A is further connected with the connecting flange A through a pressure-bearing hose, and a reference leakage point installation preformed hole is formed in the pressure-bearing hose between the stop switch A and the connecting flange A.
The pressure-bearing hose connected with the nitrogen source and the pressure stabilizing tank is further provided with a pressure control valve of the pressure stabilizing tank, and the connecting flange A is further connected with the initial end of the detected pipeline.
The pipe downstream device B includes: the device comprises a connecting flange B, an oxygen concentration sensor, an oxygen meter, a temperature transmitter, a flow transmitter B, a stop switch B, a flow regulating valve B, a pressure meter B, a pressure buffer tank, a buffer tank pressure safety valve, a purge exhaust valve, a three-way valve and a vacuum pump;
The vacuum pump is connected with one end of the pressure buffer tank through a pressure-bearing hose, and a three-way valve and a buffer tank pressure safety valve are respectively arranged on the pressure-bearing hose of the vacuum pump and the pressure buffer tank; the three-way valve is also connected with a purging exhaust valve;
The other end of the pressure buffer tank is sequentially connected with a pressure gauge B, a flow regulating valve B, a cut-off switch B, a flow transmitter B, a temperature transmitter, an oxygen meter, an oxygen concentration sensor and a connecting flange B in series through a pressure-bearing hose, and the connecting flange B is further connected with the tail end of a detected pipeline.
The oxygen concentration sensor is also connected with a data converter of the data acquisition and processing device C through a transmission cable; the temperature transmitter is also connected with a data converter of the data acquisition and processing device C through a transmission cable; the flow transmitter B is also connected with a data converter of the data acquisition and processing device C through a transmission cable.
The flow control device A is used for providing nitrogen with different flow rates, the nitrogen source timely supplements nitrogen into the surge tank through the pressure control valve of the surge tank and ensures that the pressure in the surge tank is stable, and the surge tank provides a source of stable pressure source for the detected pipeline through the flow control valve A.
And the reference leakage point installation preformed hole is provided with a reference leakage hole for detecting the accuracy of implementing leakage positioning after the pipeline leakage point positioning device is installed.
The pressure-bearing hoses are hard pressure-bearing hoses, and instrument pressure-guiding pipe joints are arranged on the pressure-bearing hoses.
The detection and positioning method of the pipeline leakage point positioning device based on the oxygen measurement method comprises the following steps of:
step one, connecting a flow control device A and a pipeline downstream device B with a detected pipeline through a connecting flange A and a connecting flange B; respectively switching the data converter and the data acquisition processing computer into power supplies, and switching the vacuum pump into the power supplies;
step two, primary inspection of the inner tube: opening an air source 1, opening a flow regulating valve A and a cut-off switch A, closing the cut-off switch B after filling certain compressed nitrogen into a pipeline, observing the pressure drop condition in the detected pipeline after stabilizing for four hours, and measuring the leakage rate of the detected pipeline; selecting a proper reference leak hole to be arranged at the position of the reference leak point installation preformed hole;
Step three, system nitrogen replacement: opening a flow regulating valve A, a stop switch B and a flow regulating valve B, fully opening a buffer tank pressure safety valve, closing a purge exhaust valve, starting a vacuum pump 23 to start vacuumizing, opening a nitrogen source after vacuumizing the detected pipeline, filling nitrogen into the pipeline, performing reciprocating pumping for several times, and completing replacement after the concentration of O 2 is reduced to be low enough;
And step four, flow stability adjustment: after the pipeline leakage point positioning device finishes N 2 air displacement, regulating the outlet pressure of a pressure control valve of the surge tank to be P 1, starting an N 2 air source, setting the opening pressure of a pressure safety valve of the surge tank to be P2 after the pressure of the pipeline leakage point positioning device is stabilized to be P1, ensuring that P2 is less than P1, opening the valve when the pressure in the surge tank is less than P2, otherwise closing the valve, regulating a flow regulating valve B after the pressure is stabilized, regulating the flow in a detected pipeline to be a target flow V 1, and stably operating until the flow is stabilized;
Step five, detecting: after the gas flow speed is stable and the oxygen concentration curve is stable, regulating the gas flow to V 2 by regulating the flow regulating valve A, and recording the regulating time T 1;
If a leakage point exists, after a period of time, the data acquisition processing computer displays that an oxygen concentration curve has obvious mutation, at the moment, the moment T 2 is recorded, the moment of last change of the oxygen concentration curve is T 3, the number of middle mutation times represents the number of the leakage points, and the distance between the leakage point and an oxygen concentration sensor is calculated according to the time T (namely T 3-T2) from the moment of flow change to the moment of mutation, the air temperature T, the pipeline sectional area S, the flow V 2 in the regulated pipe and the correction coefficient K, wherein the calculation formula is as follows (1):
273 is the fixed parameter value, i.e. the kelvin temperature corresponding to 0 ℃.
The invention has the beneficial effects that:
According to years of pipeline leakage detection experience in the industry, the invention develops a long-distance pipeline leakage point positioning device based on an oxygen leakage detection method through a plurality of test bench simulation tests, positions of flange openings at two ends of an inlet and an outlet of a pipeline are used as detection interfaces, pipeline leakage point positioning is implemented, and the number and positions of leakage points on the pipeline are determined. Besides, the invention has the following advantages:
(1) The invention provides a detection function capable of positioning the positions of the leakage points of a long-distance pipeline based on the correlation principle of the leakage rate of the leakage points and the speed in the pipeline, and can detect whether the leakage points exist or not and the number of the leakage points;
(2) The invention provides a positioning function capable of positioning the position of a long-distance pipeline leakage point, and the position of the leakage point can be accurately positioned;
(3) The device is only arranged at two ends of the detected pipeline, so that the number and the accurate position of leakage points of the whole pipeline section can be detected, the middle pipeline does not need any operation, the leakage point positioning can be implemented on the long-distance pipeline, and the original structure of the pipeline is less damaged;
(4) The device can establish a flowing and negative pressure environment in the pipeline to enable air at the leakage point to flow inwards, so that the positioning is performed according to oxygen signals, and is particularly suitable for positioning the leakage point of a single-wall pipeline which is not reachable, such as buried, high altitude and the like;
(5) The leakage point positioning device uses nitrogen and air as media to work, is safe and reliable, and can be used for detecting leakage in flammable and explosive places with high risk such as high temperature.
Drawings
FIG. 1 is a schematic diagram of a pipeline leakage point positioning device based on an oxygen measurement method according to the present invention;
Wherein: 1. nitrogen source, 2 surge tank pressure control valve, 3 surge tank, 4 pressure gauge A, 5 flow regulating valve A, 6 flow transmitter A, 7 cut-off switch A, 8 reference leak installation preformed, 9 connection flange A, 10 inspected pipe, 11 connection flange B, 12 oxygen monitoring sensor, 13 oxygen gauge, 14 temperature transmitter, 15 flow transmitter B, 16 cut-off switch B, 17 flow regulating valve B, 18 pressure gauge B, 19 pressure buffer tank, 20 buffer tank pressure safety valve, 21 purge exhaust valve, 22 three-way valve, 23 vacuum pump, 24 data converter, 25 data acquisition processing computer
Detailed Description
The invention is further described with reference to the following drawings and examples:
The device of the invention comprises: an upstream installation device A, a downstream installation device B and a data acquisition and analysis device C of the pipeline. When the size of the leakage point and the pressure inside and outside the pipeline are unchanged, namely the leakage rate of the leakage point is unchanged, the flow change in the pipe can cause the corresponding change of the downstream monitoring oxygen concentration, so the distance between the leakage point and the installation position of the downstream oxygen concentration sensor can be calculated according to the time from the flow change time to the downstream oxygen concentration change time and the flow in the pipe, thereby the positioning of the leakage point is completed, and meanwhile, the number of the leakage points can be determined according to the number of the concentration signal changes.
The invention relates to a pipeline leakage point positioning device based on an oxygen measurement method, which comprises the following components: a pipeline upstream device A, a pipeline downstream device B and a data acquisition processing device C; the data acquisition processing device C comprises: a data converter 24, a data acquisition processing computer 25 and a plurality of transmission cables; the data converter 24 is connected with the data acquisition and processing computer 25 through a transmission cable, the data converter 24 of the pipeline upstream device A and the data acquisition and processing device C is connected through a transmission cable, and the data converter 24 of the pipeline downstream device B and the data acquisition and processing device C is connected through a transmission cable.
The pipe upstream device a includes: the device comprises a nitrogen gas source 1, a pressure stabilizing tank 3, a pressure gauge A4, a flow regulating valve A5, a flow transmitter A6, a cut-off switch A7, a reference leakage point installation preformed hole 8, a connecting flange A9 and a plurality of pressure-bearing hoses; the nitrogen source 1 is connected with one end of the surge tank 3 through a pressure-bearing hose, and the other end of the surge tank 3 is sequentially connected with the pressure gauge A4, the flow regulating valve A5, the flow transmitter A6 and the cut-off switch A7 in series; the stop switch A7 is further connected with the connecting flange A9 through a pressure-bearing hose, and a reference leakage point installation preformed hole 8 is formed in the pressure-bearing hose between the stop switch A7 and the connecting flange A9.
The pressure-bearing hose connected with the pressure stabilizing tank 3 by the nitrogen gas source 1 is also provided with a pressure control valve 2 of the pressure stabilizing tank, and the connecting flange A9 is also connected with the initial end of the detected pipeline 10.
The pipe downstream device B includes: the device comprises a connecting flange B11, an oxygen concentration sensor 12, an oxygen meter 13, a temperature transmitter 14, a flow transmitter B15, a cut-off switch B16, a flow regulating valve B17, a pressure meter B18, a pressure buffer tank 19, a buffer tank pressure safety valve 20, a purge exhaust valve 21, a three-way valve 22 and a vacuum pump 23;
The vacuum pump 23 is connected with one end of the pressure buffer tank 19 through a pressure-bearing hose, and a three-way valve 22 and a buffer tank pressure safety valve 20 are respectively arranged on the pressure-bearing hose of the vacuum pump 23 and the pressure buffer tank 19; the three-way valve 22 is also connected with a purge exhaust valve 21;
the other end of the pressure buffer tank 19 is sequentially connected with a pressure gauge B18, a flow regulating valve B17, a cut-off switch B16, a flow transmitter B15, a temperature transmitter 14, an oxygen gauge 13, an oxygen concentration sensor 12 and a connecting flange B11 in series through a pressure-bearing hose, and the connecting flange B11 is also connected with the tail end of the detected pipeline 10.
The oxygen concentration sensor 12 is also connected with a data converter 24 of the data acquisition and processing device C through a transmission cable; the temperature transmitter 14 is also connected with a data converter 24 of the data acquisition and processing device C through a transmission cable; the flow transmitter B15 is also connected with a data converter 24 of the data acquisition and processing device C through a transmission cable.
The flow control device A is used for providing nitrogen with different flow rates, the nitrogen source 1 timely supplements nitrogen into the surge tank 3 through the surge tank pressure control valve 2 and ensures that the pressure in the surge tank 3 is stable, and the surge tank 3 provides a source of stable pressure source for the detected pipeline 10 through the flow control valve A5.
And the reference leak point installation preformed hole 8 is provided with a reference leak hole for detecting the accuracy of implementing the electric leakage positioning after the pipeline leak point positioning device is installed.
The pressure-bearing hoses are hard pressure-bearing hoses, and instrument pressure-guiding pipe joints are arranged on the pressure-bearing hoses.
The downstream installation device B is used for collecting the medium in the detected pipeline 10 and measuring the oxygen content of the flow at the tail end of the detected pipeline 10 so that the whole pipeline leakage point positioning device provides a micro negative pressure environment
The oxygen concentration sensor 12 measures the oxygen concentration at the tail end of the detected pipeline 10 and transmits the oxygen concentration to the data acquisition and processing device C;
the temperature transmitter 14 is used for acquiring temperature signals in the detected pipeline 10 so as to correct the positioning result;
The pressure buffer tank 19 is used for establishing a stable negative pressure space smaller than the pressure stabilizing tank 3; the vacuum pump 23 is used for replacing nitrogen after vacuumizing the detected pipeline 10, and ensuring that the system pressure is stably maintained in a negative pressure state in the test process.
Data signals of the flow transmitter A6, the oxygen concentration sensor 12, the temperature transmitter 14 and the flow transmitter B15 are transmitted to the data converter 24 and then transmitted to the data acquisition processing computer 25 for processing analysis, and the data acquisition processing computer 25 is used for counting and displaying data information such as flow, temperature, oxygen concentration, time and the like.
The data acquisition processing device C is used for monitoring the dynamic change of the oxygen concentration along with time and analyzing and calculating through the data acquired from the plate A and the plate B.
The converter (24) is used for detecting the concentration change of the oxygen gas in the inner tube, and the transmission cable is used for summarizing the sensor data of the upstream installation device A and the downstream installation device B; the acquisition computer is used for analyzing and monitoring all data in real time, and calculating the accurate position of the leakage point according to flow, time and temperature information, and the specific method is as follows:
the detection and positioning method of the pipeline leakage point positioning device based on the oxygen measurement method comprises the following steps of:
step one, connecting a flow control device A and a pipeline downstream device B with a detected pipeline 10 through a connecting flange A9 and a connecting flange B11; the data converter 23 and the data acquisition processing computer 24 are respectively powered on, and the vacuum pump 23 is connected to the power supply;
step two, primary inspection of the inner tube: opening an air source 1, opening a flow regulating valve A5 and a cut-off switch A7, cutting off a switch B16, filling certain compressed nitrogen into a pipeline (the pressure is greater than 0.1 MPa), closing the cut-off switch A7, observing the pressure drop condition in the detected pipeline 10 after stabilizing for four hours, and measuring the leakage rate of the detected pipeline 10; selecting a proper reference leak hole to be arranged at the position of the reference leak point installation preformed hole 8;
step three, system nitrogen replacement: opening a flow regulating valve A5, a cut-off switch A7, a cut-off switch B16 and a flow regulating valve B17, fully opening a buffer tank pressure safety valve 20, closing a purge exhaust valve 21, starting a vacuum pump 23 to start vacuumizing, starting a nitrogen source after vacuumizing the detected pipeline 10, filling the pipeline with nitrogen, performing reciprocating pumping for several times, and completing replacement after the concentration of O 2 is reduced to be low enough by an oxygen meter 13;
And step four, flow stability adjustment: after the pipeline leakage point positioning device finishes N 2 gas replacement, regulating the outlet pressure of the pressure control valve 2 of the pressure stabilizing tank to be P 1(P1 & lt 0.1MPa, starting an N 2 gas source, setting the opening pressure of the pressure safety valve 20 of the buffer tank to be P2 after the pressure of the pipeline leakage point positioning device is stabilized to P1, ensuring that P2 & lt P1, when the pressure in the buffer tank is smaller than P2, opening the valve, otherwise closing, regulating the flow regulating valve B17 after the pressure is stabilized, regulating the flow in the detected pipeline 10 to be the target flow V 1, and stably operating until the flow is stabilized;
Step five, detecting: the gas flow in the pipeline is regulated to V 1 by regulating the flow regulating valve A5, after the gas flow speed is stable and the oxygen concentration curve is stable, the gas flow is regulated to V 2 by regulating the flow regulating valve A5, and the regulating time T 1 is recorded;
If there are leakage points, after a period of time, the data acquisition processing computer 26 will display that the oxygen concentration curve has obvious mutation, at this time, the recording time T 2, the last time the oxygen concentration curve changes is T 3, the number of middle mutation times represents the number of leakage points, and the distance between the leakage point and the oxygen concentration sensor is calculated according to the time T, the air temperature T, the pipeline sectional area S, the flow V 2 in the regulated pipe and the correction coefficient K used from the flow change time to the time when the mutation occurs, and the calculation formula is as follows (1):
273 is a fixed parameter value, namely the Kelvin temperature corresponding to 0 ℃; the time T taken from the moment of flow change to the moment of abrupt change is T 3-T2.
Test verification
The device carries out a pipeline simulation leakage point positioning test in a laboratory, and test results show that the leakage point position can be detected by using the device.
Effect assessment
The device can safely, accurately and flexibly detect the position of the leakage point of the upper distance pipeline, uses nitrogen and air as detection media, has a relatively simple structure, and has the characteristics of high safety, good accuracy and relatively simple implementation. When the device is used, the detected pipeline does not need to be heated, electrified and other operations, and can be completely used in flammable and explosive places, in addition, the device only needs to be installed at the two ends of the inlet and the outlet of the pipeline, so that the device can be used for detecting leakage of common pipelines, also can be used in long-distance pipeline leakage detection work in the fields of high-altitude pipelines, oil-gas transportation and the like, and has great engineering application value.
The present invention has been described in detail with reference to the drawings and the embodiments, but the present invention is not limited to the embodiments described above, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The invention may be practiced otherwise than as specifically described.
Claims (7)
1. Pipeline leak source positioner based on oxygen method of survey, characterized by includes: a pipeline upstream device A, a pipeline downstream device B and a data acquisition processing device C; the data acquisition processing device C comprises: the data acquisition system comprises a data converter (24), a data acquisition processing computer (25) and a plurality of transmission cables; the data converter (24) is connected with the data acquisition and processing computer (25) through a transmission cable, the pipeline upstream device A is connected with the data converter (24) of the data acquisition and processing device C through a transmission cable, and the pipeline downstream device B is connected with the data converter (24) of the data acquisition and processing device C through a transmission cable;
the pipe downstream device B includes: the device comprises a connecting flange B (11), an oxygen concentration sensor (12), an oxygen meter (13), a temperature transmitter (14), a flow transmitter B (15), a cut-off switch B (16), a flow regulating valve B (17), a pressure meter B (18), a pressure buffer tank (19), a buffer tank pressure safety valve (20), a purge exhaust valve (21), a three-way valve (22) and a vacuum pump (23);
one end of the vacuum pump (23) is connected with one end of the pressure buffer tank (19) through a pressure-bearing hose, and a three-way valve (22) and a buffer tank pressure safety valve (20) are respectively arranged on the pressure-bearing hose of the vacuum pump (23) and the pressure buffer tank (19); the three-way valve (22) is also connected with a purging exhaust valve (21);
the other end of the pressure buffer tank (19) is sequentially connected with a pressure gauge B (18), a flow regulating valve B (17), a cut-off switch B (16), a flow transmitter B (15), a temperature transmitter (14), an oxygen meter (13), an oxygen concentration sensor (12) and a connecting flange B (11) in series through a pressure-bearing hose, and the connecting flange B (11) is also connected with the tail end of a detected pipeline (10); an oxygen meter (13) for displaying the O 2 concentration;
The pipe upstream device a includes: the device comprises a nitrogen gas source (1), a pressure stabilizing tank (3), a pressure gauge A (4), a flow regulating valve A (5), a flow transmitter A (6), a stop switch A (7), a reference leakage point installation preformed hole (8), a connecting flange A (9) and a plurality of pressure-bearing hoses; the nitrogen gas source (1) is connected with one end of the pressure stabilizing tank (3) through a pressure-bearing hose, and the other end of the pressure stabilizing tank (3) is sequentially connected with the pressure gauge A (4), the flow regulating valve A (5), the flow transmitter A (6) and the cut-off switch A (7) in series; the stop switch A (7) is further connected with the connecting flange A (9) through a pressure-bearing hose, and a reference leakage point installation preformed hole (8) is formed in the pressure-bearing hose between the stop switch A (7) and the connecting flange A (9).
2. The oxygen measurement method-based pipeline leakage point positioning device as set forth in claim 1, wherein: the pressure-bearing hose connected with the pressure-stabilizing tank (3) by the nitrogen gas source (1) is further provided with a pressure-stabilizing tank pressure control valve (2), and the connecting flange A (9) is further connected with the initial end of the detected pipeline (10).
3. The oxygen measurement method-based pipeline leakage point positioning device as set forth in claim 2, wherein: the oxygen concentration sensor (12) is connected with a data converter (24) of the data acquisition and processing device C through a transmission cable; the temperature transmitter (14) is connected with a data converter (24) of the data acquisition and processing device C through a transmission cable; the flow transmitter B (15) is connected with a data converter (24) of the data acquisition and processing device C through a transmission cable.
4. A pipeline leakage point positioning device based on an oxygen measuring method as set forth in claim 3, wherein: the pipeline upstream device A is used for providing nitrogen with different flow rates, the nitrogen gas source (1) supplements nitrogen into the surge tank (3) in time through the surge tank pressure control valve (2) and ensures that the pressure in the surge tank (3) is stable, and the surge tank (3) provides a gas source with stable pressure source into the detected pipeline (10) through the flow control valve A (5).
5. The oxygen measurement method-based pipeline leakage point positioning device as set forth in claim 4, wherein: the reference leakage point installation preformed hole (8) is provided with a reference leakage hole for detecting the accuracy of implementing leakage positioning after the pipeline leakage point positioning device is installed.
6. The oxygen measurement method-based pipeline leakage point positioning device as set forth in claim 5, wherein: the pressure-bearing hoses are hard pressure-bearing hoses, and instrument pressure-guiding pipe joints are arranged on the pressure-bearing hoses.
7. A method for detecting and positioning a pipe leakage point positioning device based on an oxygen measuring method as set forth in any one of claims 1 to 6, comprising the steps of:
step one, connecting a pipeline upstream device A and a pipeline downstream device B with a detected pipeline (10) through a connecting flange A (9) and a connecting flange B (11); the data converter (24) and the data acquisition processing computer (25) are respectively powered on, and the vacuum pump (23) is connected to the power supply;
step two, primary inspection of the inner tube: opening an air source (1), opening a flow regulating valve A (5) and a cut-off switch A (7), closing a cut-off switch B (16), filling certain compressed nitrogen into a pipeline, closing the cut-off switch A (7), observing the pressure drop condition in the detected pipeline (10) after stabilizing for four hours, and measuring the leakage rate of the detected pipeline (10); selecting a proper reference leak hole to be arranged at the position of a reference leak point installation preformed hole (8);
Step three, system nitrogen replacement: opening a flow regulating valve A (5), a cut-off switch A (7), a cut-off switch B (16) and a flow regulating valve B (17), fully opening a buffer tank pressure safety valve (20), closing a purge exhaust valve (21), starting a vacuum pump (23) to start vacuumizing, opening a nitrogen gas source after vacuumizing the detected pipeline (10), filling nitrogen in the pipeline, performing reciprocating pumping for several times, and completing replacement after the concentration of O 2 is reduced to be low enough;
And step four, flow stability adjustment: after the pipeline leakage point positioning device finishes N 2 air displacement, regulating the outlet pressure of a pressure stabilizing tank pressure control valve (2) to be P 1, starting an N 2 air source, setting the opening pressure of a buffer tank pressure safety valve (20) to be P2 after the pipeline leakage point positioning device pressure is stabilized to be P1, ensuring that P2 is less than P1, when the pressure in the buffer tank is less than P2, opening the valve, otherwise closing the valve, regulating a flow regulating valve B (17) after the pressure is stabilized, regulating the flow in a detected pipeline (10) to be a target flow V 1, and stably operating until the flow is stabilized;
Step five, detecting: after the gas flow speed is stable and the oxygen concentration curve is stable, regulating the flow of the gas to V 2 by regulating the flow regulating valve A (5), and recording the regulating time T 1;
If leakage points exist, after a period of time, the data acquisition processing computer (25) can display that an oxygen concentration curve has obvious mutation, at the moment, the moment T 2 is recorded, the moment of last change of the oxygen concentration curve is T 3, the number of middle mutation times represents the number of the leakage points, the distance between the leakage points and an oxygen concentration sensor is calculated according to the time T, the air temperature T, the pipeline sectional area S, the flow V 2 in the regulated pipe and the correction coefficient K which are used from the moment of flow change to the moment of mutation, and the calculation formula is shown as the following formula (1):
273 is a fixed parameter value, namely the Kelvin temperature corresponding to 0 ℃; the time T taken from the moment of flow change to the moment of abrupt change is T 3-T2.
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| DE19853049C2 (en) * | 1998-11-17 | 2001-09-06 | Joachim Franzke | Device and method for detecting a leak and use of such a device for leak detection |
| JP3801481B2 (en) * | 2001-10-17 | 2006-07-26 | 大阪瓦斯株式会社 | Piping leak location detection method and piping leak location detection system |
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