CN114397068B - Leakage monitoring method and system for heating power pipeline - Google Patents
Leakage monitoring method and system for heating power pipeline Download PDFInfo
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- CN114397068B CN114397068B CN202111562803.2A CN202111562803A CN114397068B CN 114397068 B CN114397068 B CN 114397068B CN 202111562803 A CN202111562803 A CN 202111562803A CN 114397068 B CN114397068 B CN 114397068B
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- way valve
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- trace gas
- gas
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/222—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for tubes
Abstract
The application discloses a leakage monitoring method of a heating power pipeline, which comprises the following steps: arranging a detection hole in the heating power pipeline, and injecting trace gas; the trace gas has readily water-soluble properties; controlling the dose of the trace gas to reach a set dose and be less than a threshold; trace gas concentration is detected along the pipeline route, and the pipeline leakage position is judged. The application also comprises a device for implementing the method. The application solves the problem that the urban heating power pipeline is difficult to effectively monitor the pipeline leakage point position.
Description
Technical Field
The application relates to the technical field of thermodynamic systems, in particular to a thermodynamic pipeline leakage monitoring method and a thermodynamic pipeline leakage monitoring system.
Background
There is no effective monitoring means for monitoring leakage of thermal lines, particularly of old and installed lines. The traditional monitoring method comprises the following steps: whether the heating power pipeline is leaked or not is judged by monitoring the environmental temperature change after leakage, monitoring the vibration noise of the pipe wall after the pipeline is leaked and the like. These methods fail to quickly locate the pipeline leak location, often requiring road excavation if the leak location is to be precisely located.
Most of the heating power pipelines adopt a direct-buried mode, and once pipeline leakage occurs, the heating power pipelines are difficult to find. A large degree of pipeline leakage often occurs before it is discovered by maintenance personnel. Unlike water supply pipeline, the heat pipeline has one heat insulating layer outside, so that the vibration leakage detection and partition metering leakage detection method for leakage detection of water supply pipeline is not suitable for non-excavation, in-service monitoring and fast positioning.
In addition, in the oil and gas industry, when water-insoluble tracer gas is injected into a pipeline, such as in a thermodynamic pipeline system, in order to ensure the pressure of hot water supplied in the thermodynamic pipeline, the pressure of the tracer gas needs to be adjusted while supplying heat, and the blending process is relatively complex.
Disclosure of Invention
The application provides a leakage monitoring method for a heating power pipeline, which solves the problem that urban heating power pipelines are difficult to effectively monitor leakage points of pipelines. The method is particularly suitable for nonmetallic heating power pipelines directly buried with heat preservation layers.
In one aspect, the present application provides a method for monitoring leakage of a thermal line, comprising the steps of:
arranging a detection hole in the heating power pipeline, and injecting trace gas; the trace gas has readily water-soluble properties;
controlling the dose of the trace gas to reach a set dose and be less than a threshold;
trace gas concentration is detected along the pipeline route, and the pipeline leakage position is judged.
Preferably, the heating pipeline is a nonmetal pipeline with a heat preservation layer directly buried.
Preferably, the trace gas is at least one of: ammonia, hydrogen chloride, nitrogen dioxide.
In another aspect, the present application further provides a thermal line leakage monitoring device, configured to implement the method according to any one of the embodiments of the present application, including:
and the trace gas generator is used for generating and storing trace gas and is communicated to the buffer cavity through the first one-way valve. And the buffer cavity is used for extracting trace gas according to the set dosage, and the buffer strength is communicated to the detection hole joint through the second one-way valve. The pneumatic pump is used for generating high pressure and pushing the tracer in the buffer cavity to be injected into the detection hole, and the pneumatic pump is communicated to the buffer cavity through a third one-way valve.
Preferably, the heat distribution pipeline leakage monitoring device further comprises a controller, wherein the controller is used for controlling the first one-way valve, the second one-way valve and the third one-way valve to enable the buffer cavity to extract the trace gas to a set dosage and enable the buffer cavity to be pressurized to exceed a set pressure threshold, and the trace agent in the buffer cavity is injected into the detection hole.
Preferably, the thermodynamic line detection device according to any one of the embodiments of the present application further comprises a gas detection module for identifying the type and amount of trace gas in the air.
Preferably, the heating power pipeline detection device according to any one of the embodiments of the present application further includes a data processor connected to the controller and the gas detection module through a communication interface, and configured to calculate a leakage point location range according to control time data of each one-way valve, trace gas dosage data of the buffer cavity, pressure data, and trace gas type and quantity data in the air identified by the gas detection module.
The above at least one technical scheme adopted by the embodiment of the application can achieve the following beneficial effects:
compared with the conventional excavation monitoring, noise detection or laying sensing optical fiber equipment, the scheme of the application is convenient and easier to locate pipeline leakage in advance, and the monitoring cost is lower.
The application also converts the monitoring object of pipeline leakage from the traditional monitoring characteristics such as liquid level and the like into the gas concentration characteristics, and the gas is easier to monitor than temperature, noise and liquid level.
The application is realized more easily for old pipelines by filling the thermodynamic pipeline medium with the gas which is easy to dissolve in water, volatilize and have a stimulating taste, and the gas is easy to penetrate soil and diffuse into air. By utilizing the characteristics of water-soluble and volatile property of certain gases, the water-soluble tracer gas is easier to fill and operate than the water-insoluble tracer gas by controlling the pressure of hot water or water vapor, unlike the complex pressure adjustment of the water-insoluble tracer gas.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a flow chart of an embodiment of a thermal line leak monitoring method of the present application;
FIG. 2 is a schematic diagram of an embodiment of a thermal line leak monitoring apparatus of the present application;
FIG. 3 is a schematic view of another embodiment of a thermal line leak monitoring apparatus of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The following describes in detail the technical solutions provided by the embodiments of the present application with reference to the accompanying drawings.
FIG. 1 is a flow chart of a method for monitoring leakage of a thermal line according to an embodiment of the present application.
On the one hand, the application provides a leakage monitoring method for a heating power pipeline, which comprises the following steps 11-14:
and 11, arranging a detection hole in the heating power pipeline.
Preferably, the heating power pipeline is directly buried with an insulation nonmetallic pipeline. The probe holes may be placed in suspected line leak sections, typically at a thermal workover well or at a pressure regulating station.
And step 12, injecting a trace gas, and controlling the dosage of the trace gas to reach a set dosage and be smaller than a threshold value.
The monitoring method converts the monitoring object of pipeline leakage from liquid level to gas monitoring; with the property that certain gases are readily soluble in water and readily volatile, the tracer gas is easier to fill and handle than a trace gas that is typically insoluble in water.
The tracer gas is filled, and the filling amount of the tracer gas can be controlled according to the actual pressure condition of the pipeline medium. The advantage of using the tracer gas for leak detection is accurate positioning, visual effect and lower cost. The core of the tracing detection technology is the selection of a tracer, the tracer and a tracing gas. Since the types of the tracers are numerous, the tracers should be selected according to the application environment and the requirements of the detected objects, and the following points are required for the tracers: easy to dissolve in water, easy to diffuse in water and soil, high in chemical inertness (not inflammable and explosive), low in cost, easy to detect in air and low in injection amount, so that detection can be realized. Preferably, the trace gas is at least one of: ammonia, hydrogen chloride and nitrogen dioxide, the requirements of the above gases on detection conditions are low, and the gas detection technology is also mature.
Step 13, detecting the concentration of the trace gas along the pipeline route.
Along the pipeline route, the concentration of the trace gas is detected by a gas detection device at the ground surface, and the characteristic parameters of the gas are extracted.
And 14, analyzing the detected gas characteristic data to determine the leakage position of the pipeline.
Analyzing the detected gas characteristic data so as to locate gas leakage points; further, the monitoring situation can be verified through excavation.
By using the method of the steps 11-14, the leakage rule and the positioning criterion are extracted by continuously accumulating the test samples, and the test method, the arrangement principle and various discrimination parameters are optimized.
FIG. 2 is a schematic diagram of a thermal line leak monitoring apparatus according to an embodiment of the present application.
In another aspect, the present application further provides a thermal line leakage monitoring device, configured to implement the method according to any one of the embodiments of the present application, including: the trace gas generator 21, a first check valve 22, a buffer cavity 23, a second check valve 24, a pneumatic pump 25 and a third check valve 26.
The trace gas generator is used for generating and storing trace gas and is communicated to the buffer cavity through the first one-way valve.
The buffer cavity is used for extracting trace gas according to the set dose, and the buffer strength is communicated to the detection hole joint 27 through a second one-way valve. Preferably, the buffer chamber is connected to a mechanical piston negative pressure generating device and contains a trace gas dosimetry device 20. Further preferably, a pressure gauge 29 is further included for monitoring the pressure value in the buffer cavity and generating a pressure detection signal.
The pneumatic pump 25 is configured to generate high pressure, push the tracer in the buffer cavity to be injected into the detection hole, and communicate with the buffer cavity through a third one-way valve.
Preferably, in the electromagnetic control valve with nonmetallic materials for the first check valve, the second check valve and the third check valve, the inner wall of the buffer cavity of the trace gas generator is nonmetallic, and the inner walls of the pipeline between the trace gas generator and the buffer cavity and the pipeline between the buffer cavity and the detection hole are nonmetallic.
Preferably, the thermal line leak monitoring apparatus also includes a controller 28 for implementing control in the following duty cycle. During the first operation: the second one-way valve and the third one-way valve are controlled to be closed, and the first one-way valve is opened until the buffer cavity extracts the trace gas to the set dosage; during the second operation: controlling the first one-way valve, the second one-way valve and the third one-way valve to be closed until the buffer cavity is pressurized to exceed a set pressure threshold; during the third operation: and controlling the first one-way valve to be closed and the second one-way valve to be opened until the tracer in the buffer cavity is injected into the detection hole.
The controller is connected with the pressure gauge and the tracer gas dosage measuring device, and determines the duration of the first working period and the switching time of the first one-way valve according to the tracer gas dosage measuring data; and determining the second working period time and the third one-way valve switching time according to the pressure test data.
The operation timing of the device according to the present embodiment is sequentially controlled in the first operation period, the second operation period, and the third operation period, and if necessary, the operation timing is cyclically controlled in the first to third operation periods, thereby forming a plurality of operation periods. According to the monitoring gas leakage condition, a pause period is set between each working period, all the one-way valves are closed, and after leakage gas detection data are acquired, the working period is stopped or paused.
FIG. 3 is a schematic view of another embodiment of a thermal line leak monitoring apparatus of the present application.
Preferably, the heating power line leakage monitoring device further comprises a water compensator 30, which is communicated with the buffer cavity through a fourth one-way valve 33, and is used for injecting liquid water or water vapor into the buffer cavity. The water replenishment device further includes a steam chamber 31 and a heater 32 for heating the liquid water to a hot water having a predetermined temperature and further heating the hot water to generate steam.
When the device of the application comprises a water refill, the controller is further configured to control the device according to the following duty cycle: during the fourth operation: and controlling the first one-way valve, the second one-way valve, the third one-way valve and the fourth one-way valve to be closed and the fourth one-way valve to be opened until the buffer cavity is filled with liquid water or water vapor to a set volume.
In connection with the embodiment shown in fig. 3, the operation timing of the device according to the present embodiment is sequentially controlled in the first operation period, the second operation period, the third operation period, and the fourth operation period, and if necessary, the above first to fourth operation periods are cyclically controlled to form a plurality of operation periods.
At this time, after hot water or water vapor enters the buffer cavity, the first one-way valve is controlled to be opened, and the fourth one-way valve is controlled to be closed, so that the trace gas enters the buffer cavity and is mixed with liquid water or water vapor.
Preferably, the thermodynamic line detection device according to any one of the embodiments of the present application further comprises a gas detection module 35 for identifying the type and amount of trace gas in the air.
Preferably, the thermodynamic line detection device according to any one of the embodiments of the present application further includes a data processor 36 connected to the controller and the gas detection module through communication interfaces 37 and 38, and configured to calculate a range of leakage point positions according to control time data of each check valve, trace gas dosage data of the buffer cavity, pressure data, and trace gas type and quantity data in the air identified by the gas detection module.
It should be noted that, the size of the trace gas dosage data in the buffer cavity affects the size of the trace gas type and quantity data in the air identified by the body detection module; the control time of each one-way valve determines the length and number of cycles of operation and can affect the dosage of trace gas entering the thermodynamic system per unit time. Therefore, the change rule of the measurement data and the change rule of the control time data of each one-way valve and the trace gas dosage data of the buffer cavity have correlation. The amount of trace gas in the air identified by the gas detection module is related to the leakage point distance. Therefore, the leakage point position range can be calculated according to the control time data of each one-way valve, the dosage data of trace gas in the buffer cavity, the pressure data and the type and quantity data of trace gas in the air identified by the gas detection module.
The communication interface is a wired circuit communication interface 37 (such as LAN or RS 232) or a wireless communication interface 38 (such as WIFI or 3/4/5/6G).
The thermal pipeline monitoring method provided by the patent belongs to a non-excavation monitoring method, and utilizes a gas detector to monitor the gas concentration, so that the method is cheaper and earlier in pipeline leakage discovery than the traditional thermal pipeline side leakage methods such as excavation, noise, optical fibers and the like.
This patent is through annotating the gas that easily dissolves water, easily volatilize, have the pungent taste in heating power pipeline medium to change the characteristic after the heating power leakage from traditional monitoring characteristic into gas concentration characteristic, gas is more easy to monitor than temperature, noise, liquid level in addition, and the gas is easy to penetrate soil diffusion to the air in, consequently the monitoring method that this patent provided need not excavate the pipeline, is more easy to realize old pipeline than previous monitoring method.
The method proposed by the patent utilizes the characteristic that certain gases (such as ammonia, hydrogen chloride, nitrogen dioxide and the like) are easy to dissolve in water and volatilize, and is easier to operate and implement than the commonly used trace gases (such as hydrogen, helium, nitrogen, argon and the like) which are insoluble in water. The water-insoluble tracer gas needs to be injected into the pipeline, and the pressure of the tracer gas needs to be adjusted while supplying heat in order to ensure the pressure of the hot water supplied in the heating power pipeline, which is a very complex blending process. The use of a tracer gas dissolved in water does not present such a problem, and only the pressure of the hot water needs to be controlled.
This patent belongs to non-excavation type heating power pipeline leakage monitoring method, utilizes gas monitoring facilities to monitor filling gas concentration and judges whether the pipeline takes place to leak, and this is than generally needs excavation monitoring, installation noise check out test set or lay sensing optical fiber equipment and will make things convenient for and locate the pipeline in advance more easily and leak, and monitoring cost is also lower.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the element defined by the phrase "comprising one … …" does not exclude the presence of additional identical elements in a process, method, article or apparatus that comprises the element.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.
Claims (6)
1. A thermal line leak monitoring device, comprising:
the trace gas generator is used for generating and storing trace gas and is communicated to the buffer cavity through the first one-way valve;
the buffer cavity is used for extracting trace gas according to the set dose and is communicated with the detection hole joint through a second one-way valve;
the pneumatic pump is used for generating high pressure and pushing the tracer in the buffer cavity to be injected into the detection hole, and the pneumatic pump is communicated to the buffer cavity through a third one-way valve;
the pressure gauge is used for monitoring the pressure value in the buffer cavity and generating a pressure detection signal;
the gas detection module is used for identifying the types and the amounts of trace gases in the air;
a controller for:
the second one-way valve and the third one-way valve are controlled to be closed, and the first one-way valve is opened until the buffer cavity extracts the trace gas to the set dosage;
controlling the first one-way valve, the second one-way valve and the third one-way valve to be closed until the buffer cavity is pressurized to exceed a set pressure threshold;
and controlling the first one-way valve to be closed and the second one-way valve to be opened until the tracer in the buffer cavity is injected into the detection hole.
2. The thermal line leak monitoring apparatus of claim 1, further comprising a water compensator in communication with the buffer chamber through a fourth one-way valve for injecting liquid water or water vapor into the buffer chamber;
the controller is further configured to: and controlling the first one-way valve, the second one-way valve, the third one-way valve and the fourth one-way valve to be closed and the fourth one-way valve to be opened until the buffer cavity is filled with liquid water or water vapor to a set volume.
3. The thermal line leak monitoring apparatus of claim 1, further comprising a data processor coupled to the controller and the gas detection module via a communication interface for calculating a leak point location range based on each one-way valve control time data, cache chamber trace gas dosage data, pressure data, trace gas type and quantity data in the air identified by the gas detection module.
4. A method for monitoring leakage of a heating power pipeline, using the device according to any one of claims 1 to 3, comprising the steps of:
arranging a detection hole in the heating power pipeline, and injecting trace gas; the trace gas has readily water-soluble properties;
controlling the dose of the trace gas to reach a set dose and be less than a threshold;
trace gas concentration is detected along the pipeline route, and the pipeline leakage position is judged.
5. A method of monitoring leakage from a thermal line as defined in claim 4,
the heating pipeline is a nonmetal pipeline directly buried with an insulating layer.
6. A method of monitoring leakage from a thermal line as defined in claim 4,
the trace gas is at least one of the following: ammonia, hydrogen chloride, nitrogen dioxide.
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| CN202111562803.2A CN114397068B (en) | 2021-12-20 | 2021-12-20 | Leakage monitoring method and system for heating power pipeline |
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| CN202111562803.2A CN114397068B (en) | 2021-12-20 | 2021-12-20 | Leakage monitoring method and system for heating power pipeline |
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| WO2015171821A1 (en) * | 2014-05-06 | 2015-11-12 | The Regents Of The University Of California | Tracer gas airflow measurement system with high turndown ratio |
| FR3073623B1 (en) * | 2017-11-16 | 2019-11-08 | Ateq | INSTALLATION AND METHOD FOR DETECTING AND LOCATING A LEAK IN A FLUID TRANSPORT CIRCUIT, IN PARTICULAR AN AIRCRAFT |
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| KR200191426Y1 (en) * | 2000-02-24 | 2000-08-16 | 주식회사사이언스리서치서비스 | Equipment for leak test with tracer gas |
| CN107430044A (en) * | 2015-01-30 | 2017-12-01 | 机械解析有限公司 | The system and method leaked for the gas tested by gas mobile parts |
| CN108267274A (en) * | 2016-12-30 | 2018-07-10 | 深圳光启空间技术有限公司 | The leak detection method of gas container |
| JP2020526879A (en) * | 2017-07-06 | 2020-08-31 | プロトチップス，インコーポレイテッド | How to handle the fluid of the electron microscope sample holder that adjusts the pressure and flow rate independently |
| CN215115046U (en) * | 2021-05-18 | 2021-12-10 | 王合涛 | Tracer gas type leak detector |
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