Oxygen and methane content detection device in opening process of natural gas pipeline

Abstract

The utility model relates to an oxygen and methane content detection device in natural gas pipeline opening process, which comprises a detection box, a sampling main pipe and a plurality of sampling branch pipes, a methane detector and an oxygen analyzer are arranged in the detection box, the methane detector and the oxygen analyzer are respectively connected with a power supply through cables, and the sampling main pipe is connected with the detection box. An inlet and an outlet which are communicated with an inner cavity of the detection box are formed in the two sides of the detection box respectively, the methane detector and the oxygen analyzer are arranged between the inlet and the outlet, the sampling main pipe is connected with the inlet, one end of each sampling branch pipe is connected with the sampling main pipe, and the other end of each sampling branch pipe is connected with an emptying pipeline of each mounting table. And control valves are respectively arranged on the sampling branch pipes. The device has the advantages of being simple and reasonable in structural design, capable of effectively detecting the oxygen and methane content of the emptying pipeline at each verification table, free of too much manual operation in the detection process, and high in detection efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas pipeline flow meter installation, in particular to a device for detecting oxygen and methane content in a natural gas pipeline opening process. Background Art

[0002] When installing flow meters on natural gas pipelines, safety supervisors are generally required to hold a four-in-one tester to test the vent of the three-way valve of the pressure transmitter. When the oxygen concentration is less than 2%, the replacement process ends; when disassembling the flow meter, the safety supervisor needs to perform the same operation until the methane concentration is less than 0.5%. Throughout the process, oxygen and combustible gas content detection work is manual, which is inefficient and labor-intensive for operators. In addition, the more links involved, the greater the safety risk.

[0003] Based on this, it is necessary to develop a device for detecting oxygen and methane content in the natural gas pipeline opening process to improve detection efficiency, reduce the workload of operators' manual participation, and reduce safety risks. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a device for detecting oxygen and methane content in the process of opening a natural gas pipeline, which effectively overcomes the defects of the prior art.

[0005] The technical solution of the utility model to solve the above technical problems is as follows:

[0006] A device for detecting oxygen and methane content during the opening process of a natural gas pipeline comprises a detection box, a sampling main pipe and a plurality of sampling branch pipes. A methane detector and an oxygen content analyzer are arranged in the detection box. The methane detector and the oxygen content analyzer are respectively connected to a power supply via a cable. An inlet and an outlet communicating with an inner cavity of the detection box are respectively arranged on both sides. The methane detector and the oxygen content analyzer are arranged between the inlet and the outlet. The sampling main pipe is connected to the inlet. One ends of the plurality of sampling branch pipes are respectively connected to the sampling main pipe, and the other ends are respectively connected to the venting pipeline of each installation position. Control valves are respectively arranged on the sampling branch pipes.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the detection box is provided with a ground wire connected to the inner side wall thereof, and the other end of the ground wire is grounded.

[0009] Furthermore, a grounding flat steel is buried in the ground, and the other end of the ground wire is connected to the grounding flat steel.

[0010] Furthermore, the inlet of the detection box is connected to an impurity filter.

[0011] Furthermore, a display is provided on the side of the detection box, and the methane detector and the oxygen analyzer are respectively connected to the display.

[0012] Furthermore, it also includes a controller, the above-mentioned control valves are all solenoid valves, and the above-mentioned controllers are respectively connected to the above-mentioned control valves.

[0013] Furthermore, it also includes a background terminal, and the background terminal is connected to the controller via a wireless communication module.

[0014] Furthermore, the vent pipelines are respectively provided with sampling ports, the sampling ports are respectively provided with stop valves, and the other ends of the plurality of sampling branch pipes are respectively connected to the sampling ports of the vent pipelines of the respective installation positions.

[0015] Furthermore, it also includes a photovoltaic system, and the photovoltaic system is connected to the power supply.

[0016] Furthermore, the detection box is provided with a column bracket, and the photovoltaic system is installed on the upper end of the column bracket.

[0017] The beneficial effects of the utility model are: the structural design is simple and reasonable, the oxygen and methane contents of the venting pipelines at each calibration station can be effectively detected, the detection process does not require much manual operation, and the detection efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the detection system of the oxygen and methane content detection device in the natural gas pipeline opening process of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the oxygen and methane content detection device in the natural gas pipeline opening process of the utility model;

[0020] Figure 3 It is a structural schematic diagram of a detection box in a device for detecting oxygen and methane content in a natural gas pipeline opening process of the utility model.

[0021] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0022] 1. Detection box; 2. Sampling main pipe; 3. Sampling branch pipe; 4. Vent pipeline; 11. Ground wire; 12. Grounding flat steel; 13. Impurity filter; 31. Control valve; 41. Stop valve. DETAILED DESCRIPTION

[0023] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0024] Example: Figure 1 , 2As shown in Figures 3 and 4, the oxygen and methane content detection device for the opening process of a natural gas pipeline in this embodiment comprises a detection box 1, a sampling main pipe 2 and a plurality of sampling branch pipes 3. A methane detector and an oxygen analyzer are arranged in the detection box 1. The methane detector and the oxygen analyzer are connected to a power source via a cable (denoted by A in the figure), and an inlet and an outlet communicating with the inner cavity are arranged on both sides of the detection box 1. The methane detector and the oxygen analyzer are arranged between the inlet and the outlet (denoted by B). The sampling main pipe 2 is connected to the inlet, and one end of the plurality of sampling branch pipes 3 is respectively connected to the sampling main pipe 2, and the other end is respectively connected to a venting line 4 of each installation position (for detection positions of different pipe diameters, such as DN80, DN100, DN150, DN200, DN250, DN300, DN400, etc.), and a control valve 31 is respectively provided on each of the sampling branch pipes 3.

[0025] When the oxygen and methane content detection device of the natural gas pipeline opening process of this embodiment is used for detection, the detected gas is introduced into the sampling main pipe 2 through the control pipeline 4 and the sampling branch pipe 3, and then enters the detection box 1, and the internal methane detector and oxygen analyzer respectively detect the oxygen content and methane content. When the oxygen concentration is less than 2%, the replacement process ends; when the flow meter is disassembled, the safety supervisor needs to perform the same operation until the methane concentration is less than 0.5%. In this process, there is no need for manual measurement, and autonomous measurement can be achieved by connecting the pipeline before measurement. The overall structural design is simple and reasonable, and can effectively detect the oxygen and methane content of the venting pipeline at each calibration station. The detection process does not require too much manual operation, and the detection efficiency is high.

[0026] As a preferred embodiment, the detection box 1 is provided with a ground wire 11 connected to the inner side wall thereof, and the other end of the ground wire 11 is grounded.

[0027] In the above embodiment, static electricity is generated when the sample gas is injected from the sampling main pipe 2 into the detection box 1 . Therefore, the static electricity can be introduced into the ground through the design of the ground wire 11 to improve safety.

[0028] Specifically, a grounding flat steel 12 is buried in the ground, and the other end of the ground wire 11 is connected to the grounding flat steel 12 .

[0029] As a preferred embodiment, the inlet of the detection box 1 is connected to an impurity filter 13 .

[0030] In the above embodiment, the sample gas is filtered at the inlet of the detection box 1 to reduce the impurity content of the sample gas entering the detection box 1, reduce the occurrence of static electricity, and improve safety.

[0031] In this embodiment, a display is provided on the side of the detection box 1, and the methane detector and the oxygen analyzer are respectively connected to the display. The oxygen content data and the methane content data detected by the methane detector and the oxygen analyzer are displayed on the display, which can provide real-time feedback to the operator.

[0032] As a preferred implementation, a controller is further included, and the control valves 31 are all solenoid valves. The controllers are respectively connected to the control valves 31 .

[0033] In the above implementation scheme, a solenoid valve is provided on each sampling branch pipe 3 and is squeezed into the same controller. Through the setting of the controller, the solenoid valve can be automatically opened and closed to facilitate the guidance and detection of the sample gas of each venting pipeline 4.

[0034] As a preferred implementation, it further includes a background terminal, and the background terminal is connected to the controller via a wireless communication module.

[0035] In the above implementation scheme, the controller is connected to the background terminal, and the detected oxygen content and methane content data as well as the valve switch data are transmitted to the background terminal via wireless transmission, so that the background staff can understand the on-site detection situation in real time.

[0036] In this embodiment, the wireless communication module adopts a conventional 4G / 5G communicator, etc.

[0037] The venting pipeline 4 is provided with sampling ports, each of which is provided with a stop valve 41 . The other ends of the plurality of sampling branch pipes 3 are connected to the sampling ports of the venting pipeline 4 at each installation position.

[0038] As a preferred implementation, it further comprises a photovoltaic system, and the photovoltaic system is connected to the power source.

[0039] In the above implementation scheme, light energy is converted into electrical energy through a photovoltaic system and stored in a power supply to power electrical components in the entire device, which can effectively utilize green energy and save energy consumption.

[0040] It should be added that photovoltaic systems are products of existing technology and generally include photovoltaic panels and other accessories, which will not be elaborated here.

[0041] In this embodiment, the detection box 1 is provided with a column support, and the photovoltaic system is installed on the upper end of the column support. The photovoltaic system and the detection box 1 are installed together, with a high degree of integration and full use of space.

[0042] In this embodiment, a plurality of tees are connected in series on the sampling main pipe 2, and one end of the plurality of sampling branch pipes 3 is connected to the plurality of tees in a one-to-one correspondence. The purpose of this design is to facilitate the quick connection of the pipeline between the sampling branch pipe 3 and the sampling main pipe 2.

[0043] In this embodiment, the specifications of the oxygen analyzer and methane detector used are shown in Table 1.

[0044] Table 1: Specifications of oxygen analyzers and methane detectors

[0045]

[0046] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0051] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A device for detecting oxygen and methane content during the opening process of a natural gas pipeline, characterized in that: The invention comprises a detection box (1), a sampling main pipe (2) and a plurality of sampling branch pipes (3). A methane detector and an oxygen content analyzer are arranged in the detection box (1). The methane detector and the oxygen content analyzer are respectively connected to a power source via a cable. An inlet and an outlet communicating with an inner cavity of the detection box (1) are respectively arranged on both sides. The methane detector and the oxygen content analyzer are arranged between the inlet and the outlet. The sampling main pipe (2) is connected to the inlet. One end of the plurality of sampling branch pipes (3) is respectively connected to the sampling main pipe (2), and the other end is respectively connected to a venting pipeline (4) of each installation position. The sampling branch pipes (3) are respectively provided with a control valve (31).

2. A device for detecting oxygen and methane content during the opening process of a natural gas pipeline according to claim 1, characterized in that: The detection box (1) is provided with a ground wire (11) connected to the inner side wall thereof, and the other end of the ground wire (11) is grounded.

3. A device for detecting oxygen and methane content during the opening process of a natural gas pipeline according to claim 2, characterized in that: A grounding flat steel (12) is buried in the ground, and the other end of the ground wire (11) is connected to the grounding flat steel (12).

4. The device for detecting oxygen and methane content during the opening process of a natural gas pipeline according to claim 1, characterized in that: The inlet of the detection box (1) is connected to an impurity filter (13).

5. The device for detecting oxygen and methane content during the opening process of a natural gas pipeline according to claim 1, characterized in that: A display is provided on the side of the detection box (1), and the methane detector and the oxygen content analyzer are respectively connected to the display.

6. The device for detecting oxygen and methane content during the opening process of a natural gas pipeline according to claim 1, characterized in that: It also includes a controller, the control valves (31) are all solenoid valves, and the controllers are respectively connected to the control valves (31).

7. A device for detecting oxygen and methane content during the opening process of a natural gas pipeline according to claim 6, characterized in that: It also includes a background terminal, which is connected to the controller via a wireless communication module.

8. The device for detecting oxygen and methane content during the opening process of a natural gas pipeline according to claim 1, characterized in that: The venting pipeline (4) is provided with a sampling port, and the sampling port is provided with a stop valve (41). The other ends of the plurality of sampling branch pipes (3) are respectively connected to the sampling ports of the venting pipeline (4) at each installation position.

9. A device for detecting oxygen and methane content in a natural gas pipeline opening process according to any one of claims 1 to 8, characterized in that: Also included is a photovoltaic system, which is connected to the power source.

10. The device for detecting oxygen and methane content during the opening process of a natural gas pipeline according to claim 9, characterized in that: The detection box (1) is provided with a column support, and the photovoltaic system is installed on the upper end of the column support.

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