CN214222766U - Pipeline leakage point positioning device based on oxygen measurement method - Google Patents
Pipeline leakage point positioning device based on oxygen measurement method Download PDFInfo
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- CN214222766U CN214222766U CN202022308988.1U CN202022308988U CN214222766U CN 214222766 U CN214222766 U CN 214222766U CN 202022308988 U CN202022308988 U CN 202022308988U CN 214222766 U CN214222766 U CN 214222766U
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Abstract
The utility model belongs to the technical field of the pipeline leak source detects the location, concretely relates to pipeline leak source positioner based on oxygen measurement method, include: the system comprises a pipeline upstream device A, a pipeline downstream device B and a data acquisition and processing device C; the data acquisition and 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 utility model belongs to the technical field of the pipeline leak source detects the location, concretely relates to pipeline leak source positioner based on the oxygen method of surveying.
Background
At present, the electric power industry has fewer methods for positioning leakage detection of long-distance pipelines, and particularly, for pipelines which are inaccessible in buried and high-altitude areas, the detection of leakage points of the pipelines is more difficult, so that the industry urgently needs to design a safe and reliable leakage point positioning device and a leakage point detection method for positioning the positions of the leakage points of the pipelines so as to solve the technical problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims at designing a pipeline leak source positioner based on oxygen method for solve among the prior art and can't detect the technical problem of leak source position to burying ground or regional inaccessible long distance pipeline in high altitude, can make clear and definite direction, reduce work load for follow-up pipeline defect treatment work.
The technical scheme of the utility model:
a pipeline leakage point positioning device based on an oxygen measurement method comprises: the system comprises a pipeline upstream device A, a pipeline downstream device B and a data acquisition and processing device C; the data acquisition and 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 comprises: 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 leak point installation preformed hole, a connecting flange A and a plurality of pressure-bearing hoses; the nitrogen gas 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 a pressure gauge A, a flow regulating valve A, a flow transmitter A and a stop switch A in series; the cut-off switch A is further connected with the connecting flange A through a pressure-bearing hose, and a reference leakage point mounting reserved hole is formed in the pressure-bearing hose between the cut-off switch A and the connecting flange A.
And a pressure-bearing hose connected with the nitrogen source and the pressure stabilizing tank is also provided with a pressure control valve of the pressure stabilizing tank, and the connecting flange A is also connected with the initial end of the detected pipeline.
The pipe downstream device B comprises: 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 gauge B, a pressure buffer tank, a buffer tank pressure safety valve, a purging 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 the vacuum pump and the pressure-bearing hose of the pressure buffer tank are respectively provided with a three-way valve and a buffer tank pressure safety valve; 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 stop 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 also connected with the tail end of the 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; and 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 flows, the nitrogen gas source supplies nitrogen to the pressure stabilizing tank in time through the pressure control valve of the pressure stabilizing tank, the pressure in the pressure stabilizing tank is ensured to be stable, and the pressure stabilizing tank provides a gas source with a stable pressure source to the detected pipeline through the flow control valve A.
And the reference leak hole is arranged on the reference leak point installation preformed hole and used for detecting the accuracy of implementing electric leakage positioning after the pipeline leak point positioning device is installed.
The pressure-bearing hose is a hard pressure-bearing hose, and an instrument pressure-leading pipe joint is arranged on the pressure-bearing hose.
The utility model has the advantages that:
the utility model discloses according to the many years pipeline leak hunting experience of trade, through a lot of test bench analogue test, developed a long distance pipeline leak source positioner based on oxygen leak hunting method to the flange mouth position at pipeline exit both ends is the detection interface, implements the pipeline leak source location, confirms leak source number and position on the pipeline. In addition, the utility model discloses still have following advantage:
(1) the utility model provides a detection function which can position the position of the leakage point of the long-distance pipeline based on the correlation principle of the leakage rate of the leakage point and the speed in the pipeline, and can detect whether the leakage exists or not and the number of the leakage points;
(2) the utility model provides a positioning function which can position the leakage point position of the long-distance pipeline, and can accurately position the leakage point position;
(3) the device can detect the number and the accurate position of the leaking points of the whole pipe section only by being arranged at the two ends of the detected pipeline, the middle pipeline does not need any operation, the leaking point positioning can be carried out on the long-distance pipeline, and the damage change of the original structure of the pipeline is small;
(4) the device can establish a flowing and negative pressure environment in the pipeline to enable air to flow in the leaking point, so that the positioning is carried out according to the oxygen signal, and the device is particularly suitable for positioning the leaking point of the inaccessible single-wall pipeline such as buried pipeline, high altitude and the like;
(5) the leak source positioning device works by using nitrogen and air as media, is safe and reliable, and can perform leak detection in flammable and explosive places, high-temperature places and other high-risk places.
Drawings
FIG. 1 is a schematic structural view of a pipeline leak location device based on an oxygen measurement method according to the present invention;
wherein: 1. nitrogen gas source, 2 pressure control valve of pressure stabilizing tank, 3 pressure stabilizing tank, 4 pressure gauge A, 5 flow regulating valve A, 6 flow transmitter A, 7 stop switch A, 8 reference leak point installation preformed hole, 9 connecting flange A, 10 detected pipeline, 11 connecting flange B, 12 oxygen monitoring sensor, 13 oxygen gauge, 14 temperature transmitter, 15 flow transmitter B, 16 stop 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 will be further described with reference to the following drawings and examples:
the utility model discloses the device includes: the device comprises a pipeline upstream installation device A, a downstream installation device B and a data acquisition and analysis device C. Under the condition that the size of the leakage point and the pressure inside and outside the pipeline are not changed, namely the leakage rate of the leakage point is not changed, the change of the flow in the pipeline 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 moment to the downstream oxygen concentration change moment and the flow in the pipeline, the positioning of the leakage point is finished, and meanwhile, the number of the leakage points can be determined according to the change times of the concentration signal.
The utility model discloses a pipeline leak source positioner based on oxygen method of surveying, include: the system comprises a pipeline upstream device A, a pipeline downstream device B and a data acquisition and processing device C; the data acquisition and 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 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 upstream device a comprises: 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 stop switch A7, a reference leakage point mounting preformed hole 8, a connecting flange A9 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 a pressure gauge A4, a flow regulating valve A5, a flow transmitter A6 and a stop switch A7 in series; the cut-off switch A7 is further connected with a connecting flange A9 through a pressure-bearing hose, and a reference leakage point mounting preformed hole 8 is formed in the pressure-bearing hose between the cut-off switch A7 and the connecting flange A9.
And a pressure-bearing hose connecting the nitrogen gas source 1 and the surge tank 3 is also provided with a surge tank pressure control valve 2, and the connecting flange A9 is also connected with the initial end of the detected pipeline 10.
The pipe downstream device B comprises: 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 stop switch B16, a flow regulating valve B17, a pressure gauge B18, a pressure buffer tank 19, a buffer tank pressure safety valve 20, a purging 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 the vacuum pump 23 and the pressure-bearing hose of the pressure buffer tank 19 are respectively provided with a three-way valve 22 and a buffer tank pressure safety valve 20; 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 in series with a pressure gauge B18, a flow regulating valve B17, a stop switch B16, a flow transmitter B15, a temperature transmitter 14, an oxygen meter 13, an oxygen concentration sensor 12 and a connecting flange B11 through a pressure-bearing hose, and the connecting flange B11 is further 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 to the data converter 24 of the data acquisition and processing device C via a transmission cable.
The flow control device A is used for providing nitrogen with different flow rates, the nitrogen gas source 1 supplies nitrogen to the pressure stabilizing tank 3 in time through the pressure control valve 2 of the pressure stabilizing tank, the pressure in the pressure stabilizing tank 3 is stable, and the pressure stabilizing tank 3 provides a gas source with a stable pressure source to the detected pipeline 10 through the flow control valve A5.
And the reference leak hole is arranged on the reference leak point installation preformed hole 8 and used for detecting the accuracy of the electric leakage positioning implemented after the pipeline leak point positioning device is installed.
The pressure-bearing hose is a hard pressure-bearing hose, and an instrument pressure-leading pipe joint is arranged on the pressure-bearing hose.
The downstream installation device B is used for collecting media 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
Wherein, 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 collecting 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 which is smaller than the pressure stabilizing tank 3; the vacuum pump 23 is used for replacing the pipeline 10 to be tested with nitrogen after vacuumizing, 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 and processing computer 25 for processing and analysis, and the data acquisition and processing computer 25 is used for counting and displaying data information such as flow, temperature, oxygen concentration, time and the like.
And the data acquisition and processing device C is used for monitoring the dynamic change of the oxygen concentration along with time and carrying out analysis and calculation through data acquired from the plate A and the plate B.
The converter (24) is used for detecting the concentration change of oxygen in the inner pipe, and the transmission cable is used for summarizing 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 the accurate position of the leakage point is calculated according to the flow, time and temperature information, and the specific method comprises the following steps:
the detection and positioning method of the pipeline leakage point positioning device based on the oxygen measurement method comprises the following steps:
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 connected with a power supply, and the vacuum pump 23 is connected with the power supply;
step two, inner tube initial inspection: opening an air source 1, opening a flow regulating valve A5 and a cut-off switch A7, cutting off a switch B16, filling a certain amount of compressed nitrogen into the pipeline (the pressure is more than 0.1MPa), closing the cut-off switch A7, observing the pressure reduction 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 installed at the position of the reference leak point installation preformed hole 8;
step three, nitrogen replacement of the system: opening a flow regulating valve A5, a stop switch A7, a stop switch B16 and a flow regulating valve B17, fully opening the buffer tank pressure safety valve 20, closing the purge exhaust valve 21, starting the vacuum pump 23 to vacuumize, starting a nitrogen gas source after vacuumizing the detected pipeline 10 to make the pipeline filled with nitrogen gas, repeatedly vacuumizing for several times, and displaying O on an oxygen meter 132After the concentration has dropped sufficiently low, the displacement is completed;
step four, flow stability adjustment: positioning device for pipeline leakage point to complete N2After gas replacement, adjusting the outlet pressure of the pressure control valve 2 of the surge tank to be P1(P1Less than 0.1MPa), opening N2The method comprises the steps that after the pressure of a pipeline leakage point positioning device is stabilized to P1, the opening pressure of a buffer tank pressure safety valve 20 is set to be P2, P2 is more than P1, when the pressure in a buffer tank is less than P2, the valve is opened, otherwise, the valve is closed, after the pressure is stabilized, a flow regulating valve B17 is regulated, the flow in a detected pipeline 10 is regulated to a target valueFlow rate V1Stably running until the flow is stable;
step five, detection: after the gas flow velocity is stable and the oxygen concentration curve is stable, adjusting the gas flow to V by adjusting the flow adjusting valve A52Recording the adjustment time T1；
If there is a leak, after a period of time, the data acquisition and processing computer 26 will display that the oxygen concentration curve has a significant sudden change, at which time the time T is recorded2The last change time of the oxygen concentration curve is T3The number of intermediate mutation times represents the number of leak points, and is determined by the time T (i.e., T) from the time of flow change to the time of occurrence of mutation3-T2) Air temperature T, pipeline sectional area S and flow V in adjusted rear pipe2And calculating the distance between the leakage point and the oxygen concentration sensor by using the correction coefficient K, wherein the calculation formula is as follows (1):
test verification
The device develops a pipeline simulation leak point positioning test in a laboratory, and the test result shows that the position of the leak point can be detected by using the device.
Evaluation of effects
The utility model discloses apart from pipeline leakage point position on can safe, accurate, nimble detection, the device uses nitrogen gas and air as inspection medium and structure simple relatively, has that the security is high, the accuracy is good, implement characteristics simple and convenient relatively. When the device uses, the pipeline need not operations such as heating and circular telegram to be examined, can use in inflammable and explosive place environment completely, and in addition, the device only need install at pipeline exit both ends, not only checks for leaks to ordinary pipeline, also can use in the long distance pipeline leak hunting work in fields such as high altitude pipeline, oil gas transportation, has great engineering using value.
The present invention has been described in detail with reference to the accompanying drawings and examples, but the present invention is not limited to the above examples, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. The present invention can adopt the prior art for the content which is not described in detail in the present invention.
Claims (8)
1. A pipeline leak source positioning device based on an oxygen measurement method is characterized by comprising the following steps: the system comprises a pipeline upstream device A, a pipeline downstream device B and a data acquisition and processing device C; the data acquisition and processing device C comprises: the system comprises a data converter (24), a data acquisition and processing computer (25) and a plurality of transmission cables; the data converter (24) is connected with the data acquisition processing computer (25) through a transmission cable, the pipeline upstream device A is connected with the data converter (24) of the data acquisition processing device C through the transmission cable, and the pipeline downstream device B is connected with the data converter (24) of the data acquisition processing device C through the transmission cable.
2. The pipeline leakage point positioning device based on the oxygen measuring method as claimed in claim 1, wherein: the pipe upstream device a comprises: 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 mounting preformed hole (8), a connecting flange A (9) and a plurality of pressure-bearing hoses; the nitrogen 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 a pressure gauge A (4), a flow regulating valve A (5), a flow transmitter A (6) and a stop switch A (7) in series; the cut-off switch A (7) is further connected with a connecting flange A (9) through a pressure-bearing hose, and a reference leakage point mounting preformed hole (8) is formed in the pressure-bearing hose between the cut-off switch A (7) and the connecting flange A (9).
3. The pipeline leakage point positioning device based on the oxygen measuring method as claimed in claim 2, wherein: the pressure-bearing hose connected with the pressure-stabilizing tank (3) through 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).
4. The pipeline leakage point positioning device based on the oxygen measuring method as claimed in claim 3, wherein: the pipe downstream device B comprises: 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 stop switch B (16), a flow regulating valve B (17), a pressure gauge B (18), a pressure buffer tank (19), a buffer tank pressure safety valve (20), a purging 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 the vacuum pump (23) and the pressure-bearing hose of the pressure buffer tank (19) are respectively provided with a three-way valve (22) and a buffer tank pressure safety valve (20); 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 stop 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 further connected with the tail end of the detected pipeline (10).
5. The pipeline leakage point positioning device based on the oxygen measurement method as claimed in claim 4, 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.
6. The pipeline leakage point positioning device based on the oxygen measurement method as claimed in claim 5, wherein: the pipeline upstream device A is used for providing nitrogen with different flow rates, the nitrogen gas source (1) supplies nitrogen to the pressure stabilizing tank (3) in time through the pressure control valve (2) of the pressure stabilizing tank and ensures the pressure in the pressure stabilizing tank (3) to be stable, and the pressure stabilizing tank (3) provides a gas source with a stable pressure source in the detected pipeline (10) through the flow control valve A (5).
7. The pipeline leakage point positioning device based on the oxygen measurement method as claimed in claim 6, wherein: and the reference leak hole is arranged on the reference leak point installation preformed hole (8) and used for detecting the accuracy of implementing electric leakage positioning after the pipeline leak point positioning device is installed.
8. The pipeline leakage point positioning device based on the oxygen measuring method as claimed in claim 7, wherein: the pressure-bearing hose is a hard pressure-bearing hose, and an instrument pressure-leading pipe joint is arranged on the pressure-bearing hose.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112197177A (en) * | 2020-10-16 | 2021-01-08 | 江苏核电有限公司 | Pipeline leakage point positioning device based on oxygen measurement method and detection positioning method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112197177A (en) * | 2020-10-16 | 2021-01-08 | 江苏核电有限公司 | Pipeline leakage point positioning device based on oxygen measurement method and detection positioning method thereof |
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