Online pipeline methane concentration detection device

Abstract

The utility model relates to the technical field of natural gas pipeline transportation, and particularly discloses an online pipeline methane concentration detection device which comprises an instrument three-way valve, a gas taking hose and a communication module, and the gas taking hose is used for connecting the instrument three-way valve with a methane detection analyzer through a pressure reducing valve; the methane detection analyzer is used for detecting and analyzing methane concentration, and the communication module is used for transmitting concentration data obtained through detection and analysis. According to the utility model, sample gas is collected and analyzed by adopting a laser absorption spectrum technology, so that data detection is more accurate, and high-pressure pipeline gas is directly connected through the pressure reducing valve and the gas taking hose, so that the device is applicable to pipeline gas collection, sampling and analysis in different pressure ranges; the problems that an existing methane concentration detection device cannot be suitable for methane concentration detection of a high-pressure environment in a pipeline and manual operation errors exist are solved, and the methane concentration detection device is simple in structure, reliable in performance, high in mobility, capable of being applied to hidden danger elimination construction operation scenes of the natural gas pipeline and wide in market prospect.

Description

Technical Field

[0001] The utility model belongs to the technical field of natural gas pipeline transportation, in particular to an online pipeline methane concentration detection device. Background Art

[0002] As an important energy source, natural gas has the advantages of high efficiency, low pollution and economy. It is widely used in the fields of electricity, heating, fuel and chemical industry. Generally speaking, the common way of natural gas pipeline transportation is to build pipelines and use gas pipelines to transport natural gas. Natural gas pipelines transport flammable, explosive, volatile and statically charged gases. Their safe operation is very important. The safety hazards of natural gas in natural gas pipeline transportation cannot be taken lightly or neglected. During the construction process of natural gas pipeline hidden danger elimination, the most worrying thing is that methane leaks and seeps into the working area, and explodes when encountering sparks generated in the working area, which seriously threatens the safety of construction operations. Real-time and accurate detection of the presence and content of methane in the pipeline to be tested is the key to avoiding accidents in the construction of natural gas pipeline hidden danger elimination.

[0003] At present, the commonly used devices for detecting methane concentration are: one is the diffusion sampling method, which is a detection method for methane leakage from the natural gas pipeline to the outside of the pipeline, and cannot be applied to the detection of methane concentration in the high-pressure environment inside the pipeline; the other is a pump-suction handheld instrument, which detects the gas at the sampling port, but there are operational errors, and the detection personnel are required to take samples and detect at intervals during the entire detection period, which is time-consuming and labor-intensive, and there are human error factors in data collection and storage, which is not conducive to the tracing of historical data. At the current construction site where high safety requirements are required for the elimination of hidden dangers in natural gas pipelines, the first two methane content detection methods obviously cannot meet the actual application needs. In addition, the location of the construction site is uncertain, and the above two methods do not have the function of online remote real-time detection of methane in the pipeline to be tested.

[0004] Therefore, the above-mentioned existing technical solutions have the following defects: the existing common devices for detecting methane concentration are not suitable for detecting methane concentration in a high-pressure environment in a pipeline and there are problems of human operational errors. Therefore, it is urgent to develop a device that can be conveniently carried to various natural gas pipeline hidden danger elimination construction sites to detect the real-time methane concentration of the pipeline to be tested. Utility Model Content

[0005] The purpose of the embodiment of the utility model is to provide an online pipeline methane concentration detection device to solve the problem that the commonly used devices for methane concentration detection proposed in the above background technology are not suitable for methane concentration detection in a high-pressure environment in a pipeline and have human operational errors.

[0006] The embodiment of the utility model is implemented by providing an online pipeline methane concentration detection device with simple structure, reliable performance, strong mobility, capable of detecting and analyzing the methane content in the pipeline, and completing remote monitoring of data through wireless communication. The online pipeline methane concentration detection device comprises an instrument three-way valve and a pipeline to be tested connected to one end of the instrument three-way valve. The online pipeline methane concentration detection device also includes:

[0007] A gas extraction hose is arranged on one side of the instrument three-way valve, and the gas extraction hose is used to connect the instrument three-way valve to a methane detection analyzer through a pressure reducing valve, and the methane detection analyzer is used to detect and analyze the methane concentration of the gas to be tested after taking gas from the pipeline to be tested and reducing the pressure through the pressure reducing valve; and

[0008] The communication module is arranged on the methane detection analyzer and is used to transmit the concentration data detected and analyzed by the methane detection analyzer.

[0009] Preferably, the gas extraction hose connects the pipeline to be tested and the pressure reducing valve, the gas extraction hose extracts gas from the pipeline to be tested, and the pressure reducing valve performs pressure reduction treatment on the sampled gas to be tested.

[0010] Preferably, the gas to be tested after the pressure reduction by the pressure reducing valve is flow-regulated by a flow regulating mechanism to control the gas flow rate.

[0011] Preferably, the gas to be tested after the pressure reduction by the pressure reducing valve and the control by the flow regulating mechanism is passed through a methane detection analyzer using laser absorption spectroscopy technology to perform methane concentration detection and analysis, and the tested gas after analysis is discharged through a discharge mechanism.

[0012] The beneficial effects of the utility model are:

[0013] Compared with the prior art, the online pipeline methane concentration detection device provided by the embodiment of the utility model includes an instrument three-way valve, an air extraction hose and a communication module. The air extraction hose is arranged on one side of the instrument three-way valve. The air extraction hose is used to connect the instrument three-way valve to a methane detection analyzer through a pressure reducing valve. The methane detection analyzer is used to detect and analyze the methane concentration of the gas to be detected after taking gas from the pipeline to be detected and decompressing the gas through the pressure reducing valve; the communication module is arranged on the methane detection analyzer, and is used to transmit the concentration data obtained by the methane detection analyzer. The device uses the laser absorption spectroscopy technology to collect and analyze the sample gas through the methane detection analyzer, so that the data detection is more accurate. The high-pressure pipeline gas is directly connected through the pressure reducing valve and the air extraction hose, and can be applied to the collection and sampling analysis of pipeline gas in different pressure ranges, avoiding the defect of the handheld pump suction detection device that cannot adapt to high-pressure gas and reducing the data collection error caused by human operation deviation, solving the problem that the common device for existing methane concentration detection cannot be applied to the methane concentration detection in the high-pressure environment in the pipeline and has human operation errors. The device has a simple structure, reliable performance, and strong mobility. It can be used in natural gas pipeline hidden danger elimination construction operations to achieve real-time remote monitoring, early warning, and data management of methane content in the pipeline, and has broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention.

[0015] Figure 1 This is a structural schematic diagram of an online pipeline methane concentration detection device provided in one embodiment of the utility model.

[0016] In the figure: 1- instrument three-way valve; 2- pipeline to be tested; 3- air extraction hose; 4- pressure reducing valve; 5- methane detection analyzer; 6- communication module; 7- flow regulating mechanism; 8- discharge mechanism. DETAILED DESCRIPTION

[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the utility model clearer, the technical solutions in the utility model embodiments are described clearly and completely in conjunction with the drawings in the utility model embodiments. Obviously, the described embodiments are only part of the utility model embodiments, not all of the utility model embodiments. Based on the embodiments in the utility model embodiments, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model embodiments.

[0018] In the description of the present utility model, it is to be understood that, unless otherwise expressly specified and limited, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. The above-indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, and therefore cannot be understood as limitations on the present utility model.

[0019] The specific implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0020] like Figure 1 As shown, it is a structural diagram of an online pipeline methane concentration detection device provided by an embodiment of the utility model, the online pipeline methane concentration detection device comprises an instrument three-way valve 1 and a pipeline to be tested 2 connected to one end of the instrument three-way valve 1, and the online pipeline methane concentration detection device also includes:

[0021] A gas extraction hose 3 is arranged on one side of the instrument three-way valve 1, and the gas extraction hose 3 is used to connect the instrument three-way valve 1 to a methane detection analyzer 5 through a pressure reducing valve 4. The methane detection analyzer 5 is used to detect and analyze the methane concentration of the gas to be tested after gas is extracted from the pipeline to be tested 2 and decompressed by the pressure reducing valve 4; and

[0022] The communication module 6 is arranged on the methane detection and analysis instrument 5 and is used to transmit the concentration data detected and analyzed by the methane detection and analysis instrument 5 .

[0023] Specifically, the gas to be tested in the test pipeline 2 is sent to the pressure reducing valve 4 through the instrument three-way valve 1 and the gas extraction hose 3, the pressure of the gas to be tested is reduced by the pressure reducing valve 4, and then the methane concentration of the gas to be tested is detected and analyzed by the methane detection analyzer 5 using laser absorption spectroscopy technology. The concentration data obtained by the detection and analysis can be displayed on the device body of the methane detection analyzer 5, and at the same time, the concentration data is transmitted and uploaded to the system server through the communication module 6 (specifically, the existing technology can be used, which is not elaborated here), and the detection data is recorded, stored, and monitored on the platform system, and the over-limit value warning function is completed.

[0024] In the embodiment of the utility model, the data detection is more accurate because the laser absorption spectroscopy technology is used to collect and analyze the gas to be tested. The high-pressure pipeline gas of the pipeline 2 to be tested is directly connected to the pressure reducing valve 4 and the gas extraction hose 3, which can be applied to the collection and sampling analysis of pipeline gas in different pressure ranges, avoiding the defect of the handheld pump suction detection device that cannot adapt to high-pressure gas and reducing the collection data error caused by human operation deviation. The detection device has a simple structure, reliable performance, and strong mobility. It can be used in the construction scene of natural gas pipeline hidden danger elimination, and realizes real-time remote monitoring, early warning, and data management of the methane content in the pipeline. It solves the problem that the common devices for existing methane concentration detection cannot be applied to the methane concentration detection in the high-pressure environment of the pipeline and there are human operation errors. There is no need for the detection personnel to take samples at intervals during the entire detection period. It has the function of online remote real-time detection of methane in the pipeline to be tested, and can meet the actual application needs at the construction site of natural gas pipeline hidden danger elimination with high safety operation requirements.

[0025] In one example of the present invention, the communication module 6 can adopt two major methods: wired (including laying optical cables, electrical cables or leasing telecommunication dedicated lines) and wireless (divided into establishing a dedicated wireless data transmission system (433MHZ frequency band and 2.4G frequency band) or borrowing CDPD, GSM, CDMA and other public network information platforms). For example, the existing 4G wireless communication antenna can be used to transmit the concentration data to the system server through the 4G wireless communication antenna (specifically, the existing technology can be used, which is not elaborated here), and the detection data is recorded, stored, and monitored on the platform system, and the over-limit value warning function is completed.

[0026] Furthermore, as a preferred embodiment of the utility model, the instrument three-way valve 1 includes a three-way valve body and a pressure gauge connected to the three-way valve body. Specifically, the three-way valve body and the pressure gauge can be products in the prior art, and the specific models are selected according to needs, which are not limited here. In actual applications, one port of the three-way valve body is connected to the pipeline to be tested 2, and the other two ports are respectively connected to the pressure gauge and the gas extraction hose 3, so that the gas to be tested in the pipeline to be tested 2 can be extracted through the gas extraction hose 3, that is, the gas to be tested in the pipeline to be tested 2 is sent to the pressure reducing valve 4 through the instrument three-way valve 1 and the gas extraction hose 3, and the gas to be tested is depressurized by the pressure reducing valve 4, and then the methane concentration of the gas to be tested is detected and analyzed by the methane detection analyzer 5 using laser absorption spectroscopy technology. The concentration data obtained by the detection and analysis can be displayed on the device body of the methane detection analyzer 5, and at the same time, the concentration data is uploaded to the system server through the communication module 6, and the detection data is recorded, stored, and monitored on the platform system, and the over-limit value warning function is completed.

[0027] It should be noted that, in actual installation, the pipe 2 to be tested can be used as a sampling port at the three-way valve 1 at the root of the pressure gauge, one end of the air extraction hose 3 is connected by a thread, the other end of the air extraction hose 3 is connected to the pressure reducing valve 4 by a thread, and the pressure reducing valve 4 is connected to the methane detection analyzer 5 by a thread.

[0028] Furthermore, as a preferred embodiment of the utility model, the online pipeline methane concentration detection device also includes a flow regulating mechanism 7, which is arranged on a side of the methane detection analyzer 5 away from the pressure reducing valve 4, and is used to control the flow rate of the gas to be tested after the pressure reducing valve 4 is reduced.

[0029] In an example of the present utility model, the flow regulating mechanism 7 can adopt the flow regulating products in the prior art, for example, it can be the valve products in the prior art, such as manual valve, electric valve, hydraulic valve, pneumatic valve, turbine valve, solenoid valve, electromagnetic hydraulic valve, electro-hydraulic valve, gas-liquid valve, gear valve, etc. The specific model is selected according to the demand, and it is not limited here. As long as it can act according to the predetermined requirements under the action of pressure, temperature or other forms of sensor signals, or simply open or close without relying on sensor signals, the valve relies on the drive or automatic mechanism to make the opening and closing parts move up and down, slide, swing or rotate, thereby changing the size of its flow channel area to realize its control function. The flow rate of the gas to be tested after the pressure reducing valve 4 is decompressed can be controlled by the flow regulating mechanism 7.

[0030] Furthermore, as a preferred embodiment of the utility model, one end of the flow regulating mechanism 7 is also provided with a discharge mechanism 8 for discharging the gas to be tested after the methane concentration is detected and analyzed by the methane detection analyzer 5. Specifically, the sampled gas after the pressure reduction by the pressure reducing valve 4 and the control of the flow regulating mechanism 7 is passed through the methane monitoring analyzer 5 to perform methane concentration detection and analysis using laser absorption spectroscopy technology, and the gas to be tested after analysis is discharged through the discharge mechanism 8. The analyzed data can be displayed on the device body of the methane monitoring analyzer 5, and the concentration data can be uploaded to the system server through the 4G wireless communication antenna, and the detection data can be recorded, stored, and monitored on the platform system, and the over-limit value warning function can be completed.

[0031] Furthermore, as a preferred embodiment of the present invention, the discharge mechanism 8 includes a discharge hose connected to the flow regulating mechanism 7, and a flame arrester is provided at the discharge port of the discharge hose.

[0032] In the embodiment of the utility model, specifically, one end of the flow regulating mechanism 7 is connected to the methane detection analyzer 5 by a thread, and the other end is connected to the discharge hose (including the flame arrester), the communication module 6 is connected to the circuit of the methane detection analyzer 5, and the antenna of the communication module 6 is placed outside the shell of the methane detection analyzer 5. The air or gas inside the pipeline is discharged through the discharge hose, and here the gas to be tested after the methane concentration is detected and analyzed by the methane detection analyzer 5 is discharged, that is, the methane concentration of the sampled gas is detected and analyzed by the methane monitoring analyzer 5 using the laser absorption spectroscopy technology, and the gas to be tested after the analysis is discharged through the discharge hose through the flame arrester.

[0033] Furthermore, as a preferred embodiment of the utility model, the online pipeline methane concentration detection device is provided with electric energy for continuous working time by a storage battery, and is placed in an explosion-proof box. The online pipeline methane concentration detection device is in actual use. Since it includes a gas extraction hose 3, a pressure reducing valve 4, a methane detection analyzer 5, a communication module 6, a flow regulating mechanism 7, and a discharge mechanism 8, the gas extraction hose 3 extracts gas from the root instrument three-way valve 1 (sampling port) of the pipeline to be tested 2, and the sampled gas is decompressed by the pressure reducing valve 4. At the same time, the gas flow rate is controlled by the flow regulating mechanism 7. The methane concentration of the sampled gas is detected and analyzed by the methane monitoring analyzer 5 using laser absorption spectroscopy technology, and the gas to be tested after analysis is discharged through the discharge mechanism 8. The online pipeline methane concentration detection device is provided with electric energy for continuous working time by a storage battery.

[0034] The implementation principle of this embodiment is as follows: Specifically, gas is taken from the pipeline to be tested 2 and connected to the pressure reducing valve 4 through the gas taking hose 3 to reduce the pressure of the gas to be tested, and the flow rate of the sampled gas after decompression is controlled through the flow regulating mechanism 7, and then the methane concentration of the sampled gas is detected and analyzed by the methane detection analyzer 5 using laser absorption spectroscopy technology, and the analyzed gas is discharged through the flame arrester through the discharge hose, and the analyzed data can be displayed on the device body of the methane detection analyzer 5, and at the same time, the concentration data is uploaded to the system server through the 4G wireless communication antenna, and the detection data is recorded, stored, and monitored on the platform system, and the over-limit value warning function is completed. The online pipeline methane concentration detection device provided by the utility model has a simple structure, reliable performance, and strong mobility. It can be used in the construction operation scene of natural gas pipeline hidden danger elimination to realize real-time remote monitoring of the methane content in the pipeline.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0036] It should be further explained that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The statement "including a defined element does not exclude the existence of other identical elements in the process, method, article or device including the element". The standard parts used in the utility model can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection method of each part can adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art, which will not be described in detail here.

[0037] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. An online pipeline methane concentration detection device, comprising an instrument three-way valve (1) and a pipeline to be detected (2) connected to one end of the instrument three-way valve (1), characterized in that: The online pipeline methane concentration detection device also includes: a gas extraction hose (3) arranged on one side of the instrument three-way valve (1); the gas extraction hose (3) is used to connect the instrument three-way valve (1) to a methane detection analyzer (5) via a pressure reducing valve (4); the methane detection analyzer (5) is used to detect and analyze the methane concentration of the gas to be tested after gas is extracted from the pipeline to be tested (2) and decompressed by the pressure reducing valve (4); and The communication module (6) is arranged on the methane detection and analysis instrument (5) and is used to transmit the concentration data detected and analyzed by the methane detection and analysis instrument (5).

2. The on-line pipeline methane concentration detection device according to claim 1 is characterized in that: The instrument three-way valve (1) comprises a three-way valve body and a pressure gauge connected to the three-way valve body.

3. The on-line pipeline methane concentration detection device according to claim 1 is characterized in that: The on-line pipeline methane concentration detection device further comprises a flow regulating mechanism (7), which is arranged on a side of the methane detection analyzer (5) away from the pressure reducing valve (4) and is used to control the flow rate of the gas to be detected after the pressure is reduced by the pressure reducing valve (4).

4. The on-line pipeline methane concentration detection device according to claim 3 is characterized in that: One end of the flow regulating mechanism (7) is also provided with a discharge mechanism (8) for discharging the detected gas after the methane concentration is detected and analyzed by the methane detection analyzer (5).

5. The on-line pipeline methane concentration detection device according to claim 4 is characterized in that: The discharge mechanism (8) comprises a discharge hose connected to the flow regulating mechanism (7), and a flame arrester is provided at the discharge port of the discharge hose.

6. The on-line pipeline methane concentration detection device according to claim 5 is characterized in that: The online pipeline methane concentration detection device is supplied with electric energy for the continuous working time of the device by a storage battery and is placed in an explosion-proof box.

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