A pipeline leakage detection system and method

Abstract

The present invention relates to a pipeline leakage detection system and method, which is characterized in that it includes a detection pipe, a first detection device, a second detection device, a gas input device, an analysis device, a first controller and a second controller; the detection pipe is fixedly laid above the pipeline to be detected, and a first detection device, a gas input device and a first controller are arranged in the station yard at one end of the pipeline to be detected. The first detection device is used to detect the gas flow rate in the pipeline to be detected at the corresponding end station yard; the gas input device is used to transport the leaked gas to the other end station yard of the pipeline to be detected by sending a carrier gas; a second detection device, an analysis device and a second controller are arranged in the station yard at the other end of the pipeline to be detected. The second detection device is used to detect the gas flow rate in the pipeline to be detected at this end station yard; the analysis device is used to determine whether there is leaked gas; the second controller is used to determine the gas leakage position of the pipeline to be detected. The present invention can be widely applied to the field of natural gas pipeline leakage monitoring.

Description

Technical Field

[0001] The present invention relates to a pipeline leakage detection system and method, belonging to the field of natural gas pipeline leakage monitoring. Background Art

[0002] In China, long-distance pipelines are widely used. They have the characteristics of high pressure, large diameter, long distance and networking, and are a very advantageous transportation method among modern transportation tools. At the same time, after researchers analyzed and compared many transportation systems, they found that the transportation effect of long-distance pipelines is the most obvious, with strong convenience and environmental protection, and has become an effective transportation means on a par with water transportation, railway, aviation and highway. However, during the construction of long-distance pipelines, they will pass through economically backward and uninhabited areas, as well as relatively developed and densely populated areas, and these areas all have relatively unique factors and processes, which makes it very easy for problems and defects to occur during the construction of long-distance pipelines. Among traditional pipeline management processes, leakage is the most serious problem, and leakage detection and leakage diagnosis are also very cumbersome and complex problems.

[0003] Currently, pipeline leakage monitoring methods include infrasound methods, optical fiber temperature measurement methods, flow balance model analysis methods, etc. However, they all have problems such as being unable to monitor the tiny leakage state of pipelines, being prone to false temperature alarms and low accuracy, and there is still a lack of particularly effective leakage monitoring methods. Summary of the Invention

[0004] Aiming at the above problems, the purpose of the present invention is to provide a pipeline leakage detection system and method that can monitor the tiny leakage state of pipelines and reduce the leakage false alarm rate.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: On the one hand, a pipeline leakage detection system is provided, including a detection pipe, a first detection device, a second detection device, a gas input device, an analysis device, a first controller and a second controller;

[0006] The detection pipe is fixedly laid above the pipeline to be tested, and both ends of the detection pipe are installed in the two terminal stations of the pipeline to be tested. The first detection device, the gas input device and the first controller are arranged in one of the terminal stations of the pipeline to be tested. The first detection device is used to detect the flow rate of the gas in the pipeline to be tested at the corresponding terminal station; the gas input device is used to send carrier gas to transport the leakage gas to the other terminal station of the pipeline to be tested; the first controller is used to receive and store the data detected by the first detection device, and control the opening or closing of the gas input device;

[0007] At the other end of the pipeline to be tested, a second detection device, an analysis device, and a second controller are arranged in the station yard. The second detection device is used to detect the flow rate of the gas in the pipeline to be tested at this end of the station yard; the analysis device is used to analyze the gas quality of the gas in the pipeline to be tested to determine whether there is a leaking gas; the second controller is used to receive the data detected by the first detection device sent by the first controller, and determine the gas leakage location of the pipeline to be tested according to the analysis signal of the leaking gas and the data detected by the second detection device.

[0008] Further, the gas input device includes a first gas filtration device and a gas pressurization device;

[0009] The first gas filtration device is used to purify the carrier gas input from the outside;

[0010] The gas pressurization device is used to pressurize the purified carrier gas and input it into the pipeline to be tested.

[0011] Further, the analysis device includes a second gas filtration device and a gas analyzer;

[0012] The second gas filtration device is used to purify the gas in the pipeline to be tested;

[0013] The gas analyzer is used to analyze the gas quality of the gas in the pipeline to be tested to determine whether there is a leaking gas, and send the analysis signal of the leaking gas to the second controller.

[0014] Further, both the first detection device and the second detection device include a temperature detection device, a pressure detection device, and a flow rate detection device;

[0015] The temperature detection device is used to detect the temperature of the gas in the pipeline to be tested at the corresponding end station yard;

[0016] The pressure detection device is used to detect the pressure of the gas in the pipeline to be tested at the corresponding end station yard;

[0017] The flow rate detection device is used to detect the flow rate of the gas in the pipeline to be tested at the corresponding end station yard.

[0018] Further, a signal acquisition module, a leakage determination module, and an alarm module are arranged in the second controller;

[0019] The signal acquisition module is used to receive the data detected by the second detection device, the data detected by the first detection device sent by the first controller, and the time signal when the gas input device is turned on;

[0020] The leakage determination module is used to determine the gas leakage position of the pipeline to be measured by using the mass conservation method, based on the analysis signal of the leaked gas, the data detected by the first detection device and the second detection device, the time signal when the gas input device is turned on, and the time signal when the analysis device detects the leaked gas.

[0021] Furthermore, an alarm module is also arranged in the second controller, which is used to give an alarm when gas leakage is determined.

[0022] Furthermore, the outer wall of the detection tube is a dense film layer that allows the leaked gas of the pipeline to be measured to diffuse.

[0023] Furthermore, the inner diameter of the detection tube is 5 - 30 mm, and the distance between the detection tube and the pipeline to be measured is less than 50 cm.

[0024] On the other hand, a pipeline leakage detection method is provided, including:

[0025] After the pipeline to be measured leaks, the leaked gas enters the detection tube, and the first controller controls the gas input device to send carrier gas to transport the leaked gas of the pipeline to be measured to the analysis device.

[0026] The first detection device and the second detection device respectively detect the flow rate of the gas in the pipeline to be measured at the corresponding terminal stations. The first controller sends the data detected by the first detection device and the time signal when the gas input device is turned on to the second controller, and the second detection device sends the detected data to the second controller.

[0027] The analysis device conducts gas quality analysis on the gas in the pipeline to be measured to determine whether there is leaked gas, and sends the analysis signal of the leaked gas to the second controller.

[0028] The second controller determines the gas leakage position of the pipeline to be measured according to the analysis signal of the leaked gas, the data detected by the first detection device and the second detection device, the time signal when the gas input device is turned on, and the time signal when the analysis device detects the leaked gas.

[0029] Furthermore, the second controller determines the gas leakage position of the pipeline to be measured according to the analysis signal of the leaked gas, the data detected by the first detection device and the second detection device, the time signal when the gas input device is turned on, and the time signal when the analysis device detects the leaked gas, including:

[0030] The second controller locates the gas leakage position of the pipeline to be tested by calculating the comparison relationship between the identified leakage gas signal and the product of the detected leakage signal time and the gas flow rate, and performing statistical analysis through the multiple sequential probability ratio. Among them, the detected leakage signal time is the time difference between the time signal when the gas input device is turned on and the time signal when the analysis device detects the leakage gas, and the gas flow rate corresponds to the gas flow detected by the first detection device and the second detection device.

[0031] Due to the adoption of the above technical solutions, the present invention has the following advantages:

[0032] 1. Since the detection pipe is laid in the same trench as the pipeline to be tested, and the control box and the analysis box are respectively arranged at both ends of the station yard of the pipeline to be tested, the present invention can monitor and locate extremely small leaks in the pipeline to be tested.

[0033] 2. The present invention can detect the leakage of the pipeline to be tested in real time and multiple times, and can reduce the false alarm rate of pipeline leakage.

[0034] 3. The data between the two ends of the station yard of the pipeline to be tested in the present invention can be transmitted in a timely manner, ensuring the stable performance of the system.

[0035] In summary, the present invention can be widely applied to the field of natural gas pipeline leakage monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to limit the present invention. Throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0037] Figure 1 is a schematic structural diagram of the detection system provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The exemplary embodiments of the present invention will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0039] It should be understood that the terms used herein are for the purpose of describing particular example embodiments only and are not intended to be limiting. Unless the context clearly dictates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an execution order is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0040] Although the terms first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly dictates otherwise, terms such as "first", "second", and other numerical terms when used herein do not imply an order or sequence. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the example embodiments.

[0041] For ease of description, spatial relative relationship terms may be used herein to describe the relationship of one element or feature shown in the figures to another element or feature, such as "inner", "outer", "inner side", "outer side", "below", "above", etc. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures.

[0042] The pipeline leakage detection system and method provided by the embodiments of the present invention adopt the natural gas online penetration and statistical analysis method, can realize the detection and leakage location of tiny leaks in the pipeline to be measured, and has the advantages of strong anti-interference ability and wide application fields.

[0043] Embodiment 1

[0044] As Figure 1 shown, this embodiment provides a pipeline leakage detection system, including a detection pipe 1, a control box 2, an analysis box 3, a first detection device 4, a second detection device 5, a gas input device 6, an analysis device 7, a first controller 8, and a second controller 9.

[0045] The detection tube 1 is fixedly laid above the pipeline 10 to be measured, in the same trench as the pipeline 10 to be measured. Both ends of the detection tube 1 are installed in the terminal stations at both ends of the pipeline 10 to be measured. A control box 2 is arranged in the terminal station at one end of the pipeline 10 to be measured. A first detection device 4, a gas input device 6 and a first controller 8 are arranged in the control box 2. The first detection device 4 is connected to one end of the pipeline 10 to be measured. The first detection device 4 is used to detect the temperature, pressure and flow rate of the gas in the pipeline 10 to be measured at the terminal station of the control box 2. The gas input device 6 is used to send the carrier gas and transport the leaked gas in the pipeline 10 to be measured to the analysis box 3.

[0046] The first controller 8 is electrically connected to the first detection device 4 and the gas input device 6 respectively. The first controller 8 is used to receive and store the data detected by the first detection device 4 and control the opening or closing of the gas input device 6, and send the data detected by the first detection device 4 and the time signal of the opening of the gas input device 6 to the second controller 9.

[0047] An analysis box 3 is arranged in the terminal station at the other end of the pipeline 10 to be measured. A second detection device 5, an analysis device 7 and a second controller 9 are arranged in the analysis box 3. The second detection device 5 is connected to the other end of the pipeline 10 to be measured. The second detection device 5 is used to detect the temperature, pressure and flow rate of the gas in the pipeline 10 to be measured at the terminal station of the analysis box 3. The analysis device 7 is used to analyze the quality of the gas in the pipeline 10 to be measured to determine whether there is a leaked gas, and send the analysis signal of the leaked gas to the second controller 9.

[0048] The second controller 9 is electrically connected to the second detection device 5, the analysis device 7 and the first controller 8 respectively. The second controller 9 is used to receive the data detected by the second detection device 5 and the data detected by the first detection device 4 and the time signal of the opening of the gas input device 6 sent by the first controller 8, and determine the gas leakage position of the pipeline 10 to be measured according to the analysis signal of the leaked gas and the time signal of the analysis device 7 detecting the leaked gas.

[0049] In a preferred embodiment, the outer wall of the detection tube 1 is a dense film layer that allows the leaked gas in the pipeline 10 to be measured to diffuse.

[0050] In a preferred embodiment, the inner diameter of the detection tube 1 is 5 - 30 mm, and the distance between the detection tube 1 and the pipeline 10 to be measured is less than 50 cm.

[0051] In a preferred embodiment, the gas input device 6 includes a first gas filtration device and a gas pressurization device. The first gas filtration device is connected to the gas pressurization device. The first gas filtration device and the gas pressurization device are also electrically connected to the first controller 8 respectively. The first gas filtration device is used to purify the carrier gas input from the outside. The gas pressurization device is used to pressurize the purified carrier gas and input it into the pipeline 10 to be measured.

[0052] Specifically, the gas pressure range of the carrier gas is 0.01 - 4.0 MPaG.

[0053] In a preferred embodiment, the analysis device 7 includes a second gas filtration device and a gas analyzer. The second gas filtration device is connected to the gas analyzer, and the second gas filtration device and the gas analyzer are also electrically connected to the second controller 9. The second gas filtration device is used to purify the gas in the pipeline 10 to be measured, and the gas analyzer is used to analyze the gas quality of the gas in the pipeline 10 to be measured, determine whether there is a leakage gas, and send the analysis signal of the leakage gas to the second controller 9.

[0054] Specifically, the detection accuracy of the gas analyzer for methane gas is 0.01 - 1000 ppm.

[0055] Specifically, the gas analyzer can adopt a catalytic oxidation type analyzer or a spectroscopic analyzer.

[0056] Specifically, both the first gas filtration device and the second gas filtration device can adopt molecular sieves or membrane filters.

[0057] In a preferred embodiment, both the first detection device 4 and the second detection device 5 include a temperature detection device, a pressure detection device, and a flow detection device. Among them, the temperature detection device can adopt a temperature sensor with a detection accuracy of 0.001 - 1 °C; the pressure detection device can adopt a pressure sensor with a detection accuracy of 0.001 - 100 Pa; the flow detection device can adopt a flow sensor with a detection accuracy of 0.001 - 1000 ml. The temperature detection device is used to detect the temperature of the gas in the pipeline 10 to be measured at the corresponding terminal station, the pressure detection device is used to detect the pressure of the gas in the pipeline 10 to be measured at the corresponding terminal station, and the flow detection device is used to detect the flow of the gas in the pipeline 10 to be measured at the corresponding terminal station.

[0058] In a preferred embodiment, a signal acquisition module, a leakage determination module, and an alarm module are provided in the second controller 9.

[0059] The signal acquisition module is used to receive the data detected by the second detection device 5, the data detected by the first detection device 4 sent by the first controller 8, and the time signal when the gas input device 6 is turned on.

[0060] The leakage determination module is used to adopt the mass conservation method to determine the gas leakage position of the pipeline 10 to be measured according to the analysis signal of the leakage gas, the data detected by the first detection device 4 and the second detection device 5, the time signal when the gas input device 6 is turned on, and the time signal when the analysis device 7 detects the leakage gas.

[0061] The alarm module is used to give an alarm when it is determined that there is a gas leakage.

[0062] Example 2

[0063] This embodiment provides a pipeline leakage detection method, including the following steps:

[0064] 1) Set up a pipeline leakage detection system: Lay a detection pipe 1 in the same trench along the pipeline 10 to be measured. The detection pipe 1 is located above the pipeline 10 to be measured. Both ends of the detection pipe 1 are installed in the two end stations of the pipeline 10 to be measured. A control box 2 is set up in one end station of the pipeline 10 to be measured. A first detection device 4, a gas input device 6 and a first controller 8 are arranged in the control box 2. An analysis box 3 is set up in the other end station of the pipeline 10 to be measured. A second detection device 5, an analysis device 7 and a second controller 9 are arranged in the analysis box 3.

[0065] 2) After it is found that the pipeline 10 to be measured may leak, the leaked gas, such as methane gas, enters the detection pipe 1. The first controller 8 controls the gas input device 6 to send a carrier gas to transport the leaked gas of the pipeline 10 to be measured to the analysis box 3.

[0066] 3) The first detection device 4 detects the temperature, pressure and flow rate of the gas in the pipeline 10 to be measured at the end station of the control box 2 and sends them to the first controller 8. The second detection device 5 detects the temperature, pressure and flow rate of the gas in the pipeline 10 to be measured at the end station of the analysis box 3 and sends them to the second controller 9. The first controller 8 sends the data detected by the first detection device 4 and the time signal when the gas input device 6 is turned on to the second controller 9.

[0067] 4) The analysis device 7 in the analysis box 3 conducts a gas quality analysis on the gas in the pipeline 10 to be measured to determine whether there is a leaked gas, and sends the analysis signal of the leaked gas to the second controller 9.

[0068] Specifically, the gas analyzer of the analysis device 7 identifies the methane signal in the leaked gas of the pipeline 10 to be measured through abnormal signal analysis, and sends the identified methane signal to the second controller 9.

[0069] 5) The second controller 9 uses the mass conservation method to determine the gas leakage location of the pipeline 10 to be measured according to the analysis signal of the leaked gas, the data detected by the first detection device 4 and the second detection device 5, the time signal when the gas input device 6 is turned on, and the time signal when the analysis device 7 detects the leaked gas.

[0070] Specifically, the second controller 9 locates the gas leakage position of the pipeline 10 to be measured by calculating the comparison relationship between the identified methane signal and the product of the detected leakage signal time and the gas flow rate, and performing statistical analysis through the multiple sequential probability ratio. Among them, the detected leakage signal time is the time difference between the time signal when the gas input device 6 is turned on and the time signal when the analysis device 7 detects the leakage gas, and the gas flow rate corresponds to the gas flow rates detected by the first detection device 4 and the second detection device 5. It should be noted that the statistical analysis through the multiple sequential probability ratio is the content disclosed in the prior art, and the specific process will not be elaborated here.

[0071] The above embodiments are only used to illustrate the present invention. The structures, connection methods, manufacturing processes, etc. of each component can be changed. Any equivalent transformation and improvement made on the basis of the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A pipeline leakage detection system, characterized in that, It includes a detection tube, a first detection device, a second detection device, a gas input device, an analysis device, a first controller and a second controller; The detection tube is fixedly laid above the pipeline to be measured, and both ends of the detection tube are installed in the terminal stations at both ends of the pipeline to be measured. The first detection device, the gas input device and the first controller are arranged in the terminal station at one end of the pipeline to be measured. The first detection device is used to detect the flow rate of the gas in the detection tube of the corresponding terminal station; the gas input device is used to transport the leaked gas to the terminal station at the other end of the pipeline to be measured by sending a carrier gas; the first controller is used to receive and store the data detected by the first detection device, and control the opening or closing of the gas input device; the outer wall of the detection tube is a dense film layer that allows the leaked gas of the pipeline to be measured to diffuse, the inner diameter of the detection tube is 5-30 mm, and the distance between the detection tube and the pipeline to be measured is less than 50 cm; The second detection device, the analysis device and the second controller are arranged in the terminal station at the other end of the pipeline to be measured. The second detection device is used to detect the flow rate of the gas in the detection tube of this terminal station; the analysis device is used to analyze the gas quality of the gas in the detection tube to determine whether there is a leaked gas; the second controller is used to receive the data detected by the first detection device sent by the first controller, and determine the gas leakage position of the pipeline to be measured according to the analysis signal of the leaked gas and the data detected by the second detection device; The gas input device includes a first gas filtration device and a gas pressurization device; The first gas filtration device is used to purify the externally input carrier gas; The gas pressurization device is used to pressurize the purified carrier gas and input it into the pipeline to be measured; The analysis device includes a second gas filtration device and a gas analyzer; The second gas filtration device is used to purify the gas in the pipeline to be measured; The gas analyzer is used to analyze the gas quality of the gas in the pipeline to be measured to determine whether there is a leaked gas, and send the analysis signal of the leaked gas to the second controller.

2. The pipeline leakage detection system according to claim 1, characterized in that Both the first detection device and the second detection device include a temperature detection device, a pressure detection device and a flow rate detection device; The temperature detection device is used to detect the temperature of the gas in the pipeline to be measured at the corresponding terminal station; The pressure detection device is used to detect the pressure of the gas in the pipeline to be measured at the corresponding terminal station; The flow rate detection device is used to detect the flow rate of the gas in the pipeline to be measured at the corresponding terminal station.

3. The pipeline leakage detection system according to claim 1, characterized in that, A signal acquisition module, a leakage determination module and an alarm module are arranged in the second controller; The signal acquisition module is used to receive the data detected by the second detection device, the data detected by the first detection device sent by the first controller and the time signal of the gas input device being turned on; The leakage determination module is used to adopt the mass conservation method to determine the gas leakage position of the pipeline to be measured according to the analysis signal of the leaked gas, the data detected by the first detection device and the second detection device, the time signal of the gas input device being turned on and the time signal of the analysis device detecting the leaked gas.

4. The pipeline leakage detection system according to claim 3, characterized in that, An alarm module is also provided in the second controller, which is used to give an alarm when it is determined that there is a gas leak.

5. A pipeline leakage detection method for the pipeline leakage detection system according to any one of claims 1 to 4, characterized in that, Including: After the pipeline to be tested leaks, the leaked gas enters the detection tube, and the first controller controls the gas input device to send a carrier gas to transport the leaked gas of the pipeline to be tested to the analysis device. The first detection device and the second detection device respectively detect the gas flow rate in the pipeline to be tested at the corresponding terminal station. The first controller sends the data detected by the first detection device and the time signal when the gas input device is turned on to the second controller, and the second detection device sends the detected data to the second controller. The analysis device analyzes the gas quality of the gas in the pipeline to be tested to determine whether there is a leaked gas, and sends the analysis signal of the leaked gas to the second controller. The second controller determines the gas leak location of the pipeline to be tested according to the analysis signal of the leaked gas, the data detected by the first detection device and the second detection device, the time signal when the gas input device is turned on, and the time signal when the analysis device detects the leaked gas.

6. The pipeline leakage detection method based on a pipeline leakage detection system according to claim 5, wherein, The second controller determines the gas leak location of the pipeline to be tested according to the analysis signal of the leaked gas, the data detected by the first detection device and the second detection device, the time signal when the gas input device is turned on, and the time signal when the analysis device detects the leaked gas, including: The second controller calculates the comparison relationship between the identified leaked gas signal and the product of the detection leak signal time and the gas flow rate, and conducts statistical analysis through the multiple sequential probability ratio to complete the positioning of the gas leak location of the pipeline to be tested. Among them, the detection leak signal time is the time difference between the time signal when the gas input device is turned on and the time signal when the analysis device detects the leaked gas, and the gas flow rate corresponds to the gas flow rates detected by the first detection device and the second detection device.

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