Gas-liquid linkage cut-off system

Abstract

The utility model belongs to the technical field of safety guarantee of natural gas long-distance pipelines, and discloses a gas-liquid linkage cut-off system which is characterized in that a natural gas trunk line is provided with a cut-off valve; the gas-liquid linkage cut-off system comprises a first vertical pipe and a second vertical pipe, the first vertical pipe is connected to the natural gas main line and communicated with the interior of the natural gas main line, and part of the first vertical pipe protrudes out of a terrace elevation line; the gas-liquid linkage driving unit is connected to the cut-off valve, and the gas-liquid linkage driving unit is used for driving the cut-off valve to be opened or closed; one end of the pressure guiding pipe is connected to the overground part of the first vertical pipe, the other end of the pressure guiding pipe is connected to the gas-liquid linkage driving unit, and the pressure guiding pipe is configured to obtain a pressure signal from the overground part of the first vertical pipe and transmit the pressure signal to the gas-liquid linkage driving unit. According to the utility model, fracture or failure of the pressure guide pipe can be effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of safety assurance technology for long-distance natural gas pipelines, and in particular to a gas-liquid linkage cutoff system. Background Technology

[0002] In long-distance natural gas pipeline systems, the gas-liquid linkage shut-off system is a key piece of equipment for ensuring the safe operation of the pipeline. It is mainly used for the rapid opening and closing of shut-off valves on the gas transmission trunk line to achieve functions such as pipeline rupture protection and pressure regulation. Traditional gas-liquid linkage shut-off systems draw gas directly from the buried gas transmission trunk line through pressure taps, and use the pressure changes of natural gas in the pipeline to trigger control signals, thereby driving the valve to operate.

[0003] However, due to changes in ambient temperature, the buried gas transmission trunk line will shift axially, causing the pressure pipe connected to the gas transmission trunk line to rub against the soil. Long-term friction stress can easily lead to fatigue fracture. Furthermore, the fact that the pressure pipe is connected to the buried gas transmission trunk line makes it difficult to carry out maintenance work in the future.

[0004] Therefore, there is an urgent need to propose a gas-liquid linkage cutoff system to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a gas-liquid linkage cutoff system that can effectively prevent the pressure tapping tube from breaking or failing.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model provides a gas-liquid linkage shut-off system connected to a buried natural gas trunk line, wherein the natural gas trunk line is equipped with a shut-off valve; the gas-liquid linkage shut-off system includes:

[0008] The first riser is connected to the natural gas trunk line and is internally connected to the natural gas trunk line. Part of the first riser protrudes beyond the ground elevation line.

[0009] A gas-hydraulic linkage drive unit is connected to the shut-off valve and is used to drive the shut-off valve to open or close.

[0010] A pressure-sensing pipe, one end of which is connected to the ground portion of the first riser, and the other end of which is connected to the pneumatic-hydraulic linkage drive unit, is configured to obtain a pressure signal from the ground portion of the first riser and transmit the pressure signal to the pneumatic-hydraulic linkage drive unit.

[0011] In some embodiments, the gas-liquid linkage cutoff system further includes a control unit, which is electrically connected to the gas-liquid linkage drive unit.

[0012] In some embodiments, the control unit is configured as a remote terminal control unit.

[0013] In some embodiments, the gas-liquid linkage shut-off system further includes a second riser, which is connected to and communicates with the interior of the natural gas trunk line. The second riser protrudes from the ground elevation line along the axial direction of the natural gas trunk line. The first riser and the second riser are located on both sides of the shut-off valve and are spaced apart from the shut-off valve. A first pressure transmitter is provided at the top of the first riser, and a second pressure transmitter is provided at the top of the second riser. Both the first pressure transmitter and the second pressure transmitter are electrically connected to the control unit.

[0014] In some embodiments, a first pressure gauge is provided at the top of the first riser, and a second pressure gauge is provided at the top of the second riser.

[0015] In some embodiments, the pressure tapping pipe includes an air intake section, which is connected to the first riser and is inclined. The end of the air intake section connected to the first riser is closer to the ground elevation line than the end of the air intake section that is farther away from the first riser.

[0016] In some embodiments, the pressure-sensing tube is connected to a branch tube, one end of which is in communication with the interior of the pressure-sensing tube, and the other end of which is an open end. The branch tube is equipped with a drain valve.

[0017] In some embodiments, the branch pipe is inclined toward the ground elevation line, and the open end of the branch pipe is closer to the ground elevation line than the connection end between the branch pipe and the pressure pipe.

[0018] In some embodiments, the pressure tapping pipe is provided with a pressure tapping pipe valve.

[0019] In some embodiments, the shut-off valve is configured as a ball valve.

[0020] The beneficial effects of this utility model are:

[0021] The gas-liquid linkage cutoff system provided by this utility model designs the pressure-taking pipe to draw gas from the ground part of the first riser, which prevents the pressure-taking pipe from constantly rubbing against the soil due to the axial movement of the natural gas trunk line, thereby effectively avoiding the pressure-taking pipe from breaking or failing. In addition, the fact that all the pressure-taking pipes are located on the ground also makes the subsequent maintenance and repair work more convenient. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0023] Figure 1 This is a front view of the gas-liquid linkage cutoff system provided in this embodiment of the utility model;

[0024] Figure 2 This is a top view of the gas-liquid linkage cutoff system provided in this embodiment of the utility model.

[0025] In the picture:

[0026] 100. Natural gas trunk line; 110. Shut-off valve; 200. Ground elevation line;

[0027] 1. First riser; 11. First pressure transmitter; 12. First pressure gauge;

[0028] 2. Gas-liquid linkage drive unit;

[0029] 3. Pressure tapping pipe; 31. Gas intake section;

[0030] 4. Control unit;

[0031] 5. Second riser; 51. Second pressure transmitter; 52. Second pressure gauge;

[0032] 6. Branch pipe;

[0033] 7. Drain valve;

[0034] 8. Pressure tap valve;

[0035] 10. First control signal line; 20. Second control signal line; 30. Third control signal line. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0040] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0043] like Figure 1 and Figure 2 As shown, this embodiment provides a gas-liquid linkage cutoff system, which is connected to a buried natural gas trunk line 100. The natural gas trunk line 100 is equipped with a cutoff valve 110. When the cutoff valve 110 is open, the gas inside the natural gas trunk line 100 is in a transport and flow state. When the cutoff valve 110 is closed, the gas transmission inside the natural gas trunk line 100 is cut off.

[0044] The gas-liquid linkage cutoff system includes a first riser 1, a gas-liquid linkage drive unit 2, and a pressure tapping pipe 3.

[0045] The first riser 1 is connected to and internally communicates with the natural gas trunk line 100, with a portion protruding above the ground elevation line 200. A gas-hydraulic linkage drive unit 2 is connected to a shut-off valve 110, used to open or close the shut-off valve 110. One end of a pressure tapping pipe 3 is connected to the above-ground portion of the first riser 1, and the other end is connected to the gas-hydraulic linkage drive unit 2. The pressure tapping pipe 3 is configured to obtain a pressure signal from the above-ground portion of the first riser 1 and transmit the pressure signal to the gas-hydraulic linkage drive unit 2. It can be understood that the above-ground portion of the first riser 1 is the part of the first riser 1 located above the ground elevation line 200.

[0046] In practical implementation, the shut-off valve 110 is normally open to ensure the normal transport of gas inside the natural gas trunk line 100. When the natural gas trunk line 100 experiences leakage or pipe bursting, the pressure inside the natural gas trunk line 100 will change abnormally. The pressure tapping pipe 3 transmits this pressure change to the pneumatic-hydraulic linkage drive unit 2. In the pneumatic-hydraulic linkage drive unit 2, the natural gas pressure transmitted by the pressure tapping pipe 3 serves as the power source to drive the hydraulic cylinder, which then transmits the energy to the shut-off valve 110, causing the shut-off valve 110 to close and preventing a large-scale leakage of natural gas. The pneumatic-driven hydraulic linkage drive unit 2 is a mature existing technology in this field and will not be described in detail here.

[0047] The gas-liquid linkage cutoff system provided in this embodiment designs the pressure pipe 3 to draw gas from the ground part of the first riser 1, which prevents the pressure pipe 3 from constantly rubbing against the soil due to the axial movement of the natural gas trunk line 100, thereby effectively avoiding the breakage or failure of the pressure pipe 3. In addition, the fact that the pressure pipe 3 is all located on the ground also makes the subsequent maintenance and repair work more convenient.

[0048] Optionally, the shut-off valve 110 can be a ball valve. Ball valves have good sealing performance and fast response speed, enabling rapid shut-off of the natural gas trunk line 100. Of course, in other embodiments, the shut-off valve 110 can also be a gate valve, butterfly valve, etc., depending on the actual situation.

[0049] like Figure 1 and Figure 2 As shown, in some embodiments, the pressure tapping pipe 3 is equipped with a pressure tapping pipe valve 8. This configuration allows for effective control of the pressure tapping pipe 3 during system operation or maintenance via the pressure tapping pipe valve 8.

[0050] Optionally, multiple pressure tap valves 8 are provided.

[0051] By setting multiple pressure tap valves 8, segmented control of the pressure tap 3 can be achieved. For example, if a certain section of the pressure tap 3 leaks or becomes blocked and needs maintenance, the corresponding pressure tap valve 8 can be closed to isolate that section, facilitating fault location and rapid handling.

[0052] Optionally, the pressure tap valve 8 can be set to two, three, four, etc., without specific limitation here.

[0053] like Figure 1 and Figure 2 As shown, in some embodiments, the gas-liquid linkage cutoff system further includes a control unit 4, which is electrically connected to the gas-liquid linkage drive unit 2.

[0054] With this configuration, the control unit 4 can electrically control the gas-hydraulic linkage drive unit 2, thereby automatically controlling the shut-off valve 110. This allows the gas-hydraulic linkage shut-off system to more flexibly select the control of the shut-off valve 110 according to actual conditions. For example, in special circumstances such as construction or external fire, the control unit 4 can actively send control commands to close the shut-off valve 110. Furthermore, this gas-hydraulic linkage shut-off system eliminates the traditional method of introducing natural gas pressure signals into the electronic control unit, thus avoiding the potential hazards of natural gas and electrical equipment coexisting in the same confined space, effectively preventing accidents such as fires and explosions. In other words, this configuration effectively improves the automation level and safety of the gas-hydraulic linkage shut-off system.

[0055] Optionally, control unit 4 is configured as a remote terminal control unit, i.e., RTU (Remote Terminal Unit). The RTU has remote communication and control functions and can remotely control the shut-off valve 110 through a communication network.

[0056] Optionally, the control unit 4 is electrically connected to the pneumatic-hydraulic linkage drive unit 2 via the first control electrical signal line 10.

[0057] like Figure 1 and Figure 2 As shown, in some embodiments, the gas-liquid linkage shut-off system further includes a second riser 5, which is connected to the natural gas trunk line 100 and communicates with the interior of the natural gas trunk line 100. The second riser 5 protrudes from the ground elevation line 200 along the axial direction of the natural gas trunk line 100. The first riser 1 and the second riser 5 are located on both sides of the shut-off valve 110 and are spaced apart from the shut-off valve 110. A first pressure transmitter 11 is provided at the top of the first riser 1, and a second pressure transmitter 51 is provided at the top of the second riser 5. Both the first pressure transmitter 11 and the second pressure transmitter 51 are electrically connected to the control unit 4.

[0058] by Figure 1 Taking the orientation shown as an example, the left side of the shut-off valve 110 is upstream of the natural gas trunk line 100, and the first riser 1 is located upstream. The right side of the shut-off valve 110 is downstream of the natural gas trunk line 100, and the second riser 5 is located downstream.

[0059] With this setup, the first riser 1 and the second riser 5 are connected to two different locations on the natural gas trunk line 100. The first pressure transmitter 11 and the second pressure transmitter 51 are used to detect the gas pressure upstream and downstream of the shut-off valve 110, and transmit the detected pressure values ​​to the control unit 4. Based on the pressure difference between the two and its pressure drop rate, the control unit 4 can determine in real time whether there are any abnormalities such as leaks, pipe bursts, or shut-off valve 110 failures in the natural gas trunk line 100, thereby further improving the overall safety and reliability of the system.

[0060] Optionally, the first pressure transmitter 11 is electrically connected to the control unit 4 via the second control signal line 20, and the second pressure transmitter 51 is electrically connected to the control unit 4 via the third control signal line 30.

[0061] like Figure 1 As shown, in some embodiments, a first pressure gauge 12 is installed at the top of the first riser 1, and a second pressure gauge 52 is installed at the top of the second riser 5. This arrangement allows for intuitive and real-time monitoring of the corresponding pressure values ​​via the first pressure gauge 12 and the second pressure gauge 52, facilitating quick assessment of the pipeline's operating status by operators.

[0062] like Figure 2As shown, in some embodiments, the pressure tapping pipe 3 includes an air intake section 31, which is connected to the first riser 1 and is inclined. The end of the air intake section 31 connected to the first riser 1 is closer to the ground elevation line 200 than the end of the air intake section 31 that is farther away from the first riser 1. This arrangement helps to avoid liquid accumulation inside the pressure tapping pipe 3 and reduces the risk of blockage.

[0063] like Figure 2 As shown, in some embodiments, the pressure tapping pipe 3 is connected to a branch pipe 6. One end of the branch pipe 6 is in communication with the inside of the pressure tapping pipe 3, and the other end of the branch pipe 6 is an open end. The branch pipe 6 is equipped with a drain valve 7 (also called a purge valve).

[0064] By setting up branch pipe 6 and drain valve 7, the accumulated liquid or impurities in pressure tapping pipe 3 can be periodically discharged or purged to prevent blockage of pressure tapping pipe 3 or abnormal signal transmission.

[0065] Furthermore, the branch pipe 6 is inclined toward the ground elevation line 200, and the open end of the branch pipe 6 is closer to the ground elevation line 200 than the connection end between the branch pipe 6 and the pressure pipe 3.

[0066] By arranging the branch pipe 6 downwards, it is beneficial to allow the accumulated liquid or impurities in the pressure tapping pipe 3 to naturally converge to the open end of the branch pipe 6 under the action of gravity when cleaning, so that they can be efficiently discharged through the drain valve 7.

[0067] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A gas-liquid linkage shut-off system, characterized by, A natural gas trunk line (100) connected to an underground pipeline is provided with a shut-off valve (110); the gas-liquid linkage shut-off system includes: The first riser (1) is connected to the natural gas trunk line (100) and communicates with the interior of the natural gas trunk line (100). Part of the first riser (1) protrudes from the ground elevation line (200). A gas-liquid linkage drive unit (2) is connected to the shut-off valve (110) and is used to drive the shut-off valve (110) to open or close. Pressure tapping pipe (3), one end of which is connected to the ground part of the first riser (1), and the other end of which is connected to the gas-liquid linkage drive unit (2). The pressure tapping pipe (3) is configured to obtain a pressure signal from the ground part of the first riser (1) and transmit the pressure signal to the gas-liquid linkage drive unit (2).

2. The gas-liquid linkage cutoff system according to claim 1, characterized in that, The gas-liquid linkage cutoff system also includes a control unit (4), which is electrically connected to the gas-liquid linkage drive unit (2).

3. The gas-liquid linkage cutoff system according to claim 2, characterized in that, The control unit (4) is configured as a remote terminal control unit.

4. The gas-liquid linkage cutoff system according to claim 2, characterized in that, The gas-liquid linkage shut-off system also includes a second riser (5), which is connected to the natural gas trunk line (100) and communicates with the interior of the natural gas trunk line (100). The second riser (5) protrudes from the ground elevation line (200) along the axial direction of the natural gas trunk line (100). The first riser (1) and the second riser (5) are located on both sides of the shut-off valve (110) and are spaced apart from the shut-off valve (110). A first pressure transmitter (11) is provided on the top of the first riser (1), and a second pressure transmitter (51) is provided on the top of the second riser (5). Both the first pressure transmitter (11) and the second pressure transmitter (51) are electrically connected to the control unit (4).

5. The gas-liquid linkage cutoff system according to claim 4, characterized in that, The first riser (1) is equipped with a first pressure gauge (12) at the top, and the second riser (5) is equipped with a second pressure gauge (52) at the top.

6. The gas-liquid linkage cutoff system according to any one of claims 1 to 5, characterized in that, The pressure pipe (3) includes an air intake section (31), which is connected to the first riser (1) and is inclined. The end of the air intake section (31) connected to the first riser (1) is closer to the ground elevation line (200) than the end of the air intake section (31) that is farther away from the first riser (1).

7. The gas-liquid linkage cutoff system according to any one of claims 1 to 5, characterized in that, The pressure-sensing pipe (3) is connected to a branch pipe (6). One end of the branch pipe (6) is in communication with the inside of the pressure-sensing pipe (3), and the other end of the branch pipe (6) is an open end. The branch pipe (6) is equipped with a drain valve (7).

8. The gas-liquid linkage cutoff system according to claim 7, characterized in that, The branch pipe (6) is inclined toward the ground elevation line (200), and the open end of the branch pipe (6) is closer to the ground elevation line (200) than the connection end of the branch pipe (6) and the pressure pipe (3).

9. The gas-liquid linkage cutoff system according to any one of claims 1 to 5, characterized in that, The pressure tapping pipe (3) is equipped with a pressure tapping pipe valve (8).

10. The gas-liquid linkage cutoff system according to any one of claims 1 to 5, characterized in that, The shut-off valve (110) is configured as a ball valve.

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