Natural gas emptying and recycling device

Abstract

The invention discloses a natural gas emptying and recycling device, relates to the technical field of natural gas emptying equipment, and aims to solve the problem of how to improve the stability of a gas supply state when the emptying and recycling device supplies gas to downstream users. The emptying recovery device comprises an emptying structure, an air inlet structure, an air exhaust structure, a first pipeline assembly and a second pipeline assembly, the first pipeline assembly and the second pipeline assembly are connected between the air inlet structure and the air exhaust structure in parallel, the emptying structure is connected with the second pipeline assembly, and the first pipeline assembly comprises a pressure regulating device. The stability of the gas supply state when the emptying recovery device supplies gas to downstream users is improved.

Description

Technical Field

[0001] This application relates to the field of natural gas venting equipment technology, and more particularly to a natural gas venting and recovery device. Background Technology

[0002] Natural gas distribution stations are used to distribute natural gas from the main natural gas pipeline to downstream users. During the maintenance and repair of distribution stations, it is necessary to vent the natural gas in the distribution station.

[0003] In the existing technology, in order to avoid resource waste, the natural gas vented from the distribution station is usually transported to downstream users through a venting recovery device.

[0004] However, due to structural defects in the venting and recovery device, fluctuations in the natural gas supply status occur when natural gas is transported from the distribution station to downstream users. Summary of the Invention

[0005] The purpose of this application is to provide a natural gas venting and recovery device, which aims to solve the problem of how to improve the stability of the gas supply status when the venting and recovery device supplies gas to downstream users.

[0006] This application provides a natural gas venting and recovery device, which includes a venting structure, an intake structure, an exhaust structure, and a first pipeline assembly and a second pipeline assembly connected in parallel between the intake structure and the exhaust structure. The venting structure is connected to the second pipeline assembly, and the first pipeline assembly includes a pressure regulating device.

[0007] In the above scheme, since the first and second pipeline assemblies are connected in parallel between the intake and exhaust structures, air is supplied to the exhaust structure simultaneously through both assemblies. When the air supply status of the second pipeline assembly fluctuates due to fluctuations in the venting state of the venting structure, the air supply status of the first pipeline assembly can be adjusted by the pressure regulating device in the first pipeline assembly to compensate for the fluctuations in the air supply status of the second pipeline assembly, ensuring the stability of the air supply status at the exhaust structure, and thus improving the stability of the air supply status when the venting recovery device supplies air to downstream users.

[0008] Optionally, the pressure regulating device includes at least one pressure regulating valve.

[0009] Optionally, the number of pressure regulating valves is at least two, and the at least two pressure regulating valves are arranged in series.

[0010] Optionally, the second pipeline assembly includes a flow guide, which includes an acceleration structure and a deceleration structure; from the intake structure to the exhaust structure, the deceleration structure is located between the acceleration structure and the exhaust structure, and the cross-sectional area of ​​the acceleration structure gradually decreases while the cross-sectional area of ​​the deceleration structure gradually increases; one end of the venting structure is connected to the portion between the acceleration structure and the deceleration structure, or one end of the venting structure is connected to the end of the deceleration structure facing the acceleration structure.

[0011] Optionally, the drainage component further includes a shell, the shell comprising a first shell portion and a second shell portion located between the first shell portion and the exhaust structure, at least a portion of the second shell portion forming the deceleration structure, the acceleration structure being housed within the first shell portion, and the acceleration structure and the first shell portion forming a transition cavity, the transition cavity communicating with the portion between the acceleration structure and the deceleration structure; one end of the venting structure communicating with the transition cavity.

[0012] Optionally, the second piping assembly further includes a first switching valve connected between the drain element and the intake structure; and / or, the second piping assembly further includes a second switching valve connected between the drain element and the exhaust structure.

[0013] Optionally, the venting recovery device includes a flow detection component for detecting the flow rate of the exhaust structure.

[0014] Optionally, the flow detection component includes a first detection element connected to the venting structure; and / or, the flow detection component further includes a second detection element connected to the intake structure.

[0015] Optionally, the venting recovery device further includes a pressure detection element connected to one of the first pipeline assembly, the second pipeline assembly, and the exhaust structure, for detecting the exhaust pressure of the exhaust structure.

[0016] Optionally, the venting and recovery device further includes a controller, which is electrically connected to the pressure regulating device and is used to control the pressure regulating device to adjust the gas supply pressure of the first pipeline assembly in order to control the exhaust pressure of the exhaust structure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a natural gas venting and recovery device provided in an embodiment of this application; Figure 2 for Figure 1 The diagram shows the structure of the guide component in the venting and recovery device.

[0019] Figure label: 1. Air intake structure; 2. Exhaust structure; 3. Venting structure; 31. Fourth switching valve; 32. Check valve; 4. First pipeline assembly; 41. Pressure regulating device; 411. Electric pressure regulating valve; 412. Monitoring pressure regulating valve; 413. Third switching valve; 5. Second pipeline assembly; 51. Drainage component; 511. Speed-up structure; 512. Speed-down structure; 513. First pipe shell section; 514. Second pipe shell section; 515. Transition chamber; 52. First switching valve; 53. Second switching valve; 61. First inspection piece; 62. Second inspection piece; 7. Pressure testing components; 8. Controller. Detailed Implementation

[0020] In the embodiments of this application, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," "fourth," "fifth," and "sixth" may explicitly or implicitly include one or more of that feature.

[0021] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0022] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0023] In the embodiments of this application, "parallel," "perpendicular," and "equal" include the described situation and situations similar to the described situation, where the range of similarity is within an acceptable deviation range, which is determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, where the acceptable deviation range for approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, where the acceptable deviation range for approximate perpendicularity can also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, where the acceptable deviation range for approximate equality can be, for example, a difference between the two equals being less than or equal to 5% of either one.

[0024] See Figure 1 This application provides a natural gas venting and recovery device. To facilitate understanding of the technical solution provided by this application, the application scenarios of the natural gas venting and recovery device provided by this application are described below: The venting and recovery device provided in this application is mainly used in natural gas distribution stations, which are key facilities in long-distance natural gas pipeline systems used to distribute natural gas to downstream cities, industrial or commercial users. In some cases, it is necessary to vent the natural gas in the distribution station. For example, to ensure the safety of gas supply, it is necessary to regularly inspect and maintain the equipment in the distribution station, and the pipelines to be inspected and maintained need to be vented before the work begins; or when the gas supply pipeline is rerouted, it is necessary to vent the natural gas in the relevant pipelines.

[0025] To avoid resource waste, the vented air at distribution stations needs to be recycled. For example, when the pressure of natural gas in the pipeline is high, the vented air is sent to downstream users through a vent recovery device. When the pressure of natural gas in the pipeline is lower than the preset pressure, the remaining natural gas in the pipeline is consumed through a flare.

[0026] It should be noted that venting recovery devices can be used not only in natural gas distribution stations but also in pressure regulating stations, gas field gathering and transmission stations, etc. For ease of understanding, this application uses the application of a venting recovery device in a natural gas distribution station as an example for illustration.

[0027] In related technologies, a venting recovery device is used to connect the venting pipeline to the gas supply pipeline of the downstream user in order to recover and reuse the vented air. However, as the venting operation proceeds, the gas pressure in the venting pipeline gradually decreases, and the natural gas flow rate generally decreases as well, resulting in unstable pressure and flow rate of gas supplied to downstream users, and the gas supply status is prone to fluctuations.

[0028] In addition, during the opening and closing of the venting and recovery device, the sudden connection and disconnection of the venting pipeline will also cause fluctuations in the gas supply status, which will have a certain impact on the gas supply status of downstream users.

[0029] To address the aforementioned problems, this application provides a natural gas venting and recovery device, see reference. Figure 1 The venting and recovery device includes a venting structure 3, an intake structure 1, an exhaust structure 2, and a first pipeline assembly 4 and a second pipeline assembly 5 connected in parallel between the intake structure 1 and the exhaust structure 2. The venting structure 3 is connected to the second pipeline assembly 5, and the first pipeline assembly 4 includes a pressure regulating device 41.

[0030] In the above scheme, since the first pipeline assembly 4 and the second pipeline assembly 5 are connected in parallel between the intake structure 1 and the exhaust structure 2, the exhaust structure 2 is supplied with air simultaneously through the first pipeline assembly 4 and the second pipeline assembly 5. When the air supply state of the second pipeline assembly 5 fluctuates due to the fluctuation of the venting state of the venting structure 3, the air supply state of the first pipeline assembly 4 can be adjusted by the pressure regulating device 41 in the first pipeline assembly 4 to compensate for the fluctuation of the air supply state of the second pipeline assembly 5, ensuring the stability of the air supply state at the exhaust structure 2, and thus improving the stability of the air supply state when the venting recovery device supplies air to downstream users.

[0031] In some examples, the intake structure 1 is used to connect to the gas supply pipeline, which can normally supply natural gas to downstream users. The exhaust structure 2 is used to connect to downstream users to supply gas to them. One end of the venting structure 3 is connected to the second pipeline assembly 5, and the other end is used to connect to the venting pipeline, so that the natural gas in the venting pipeline flows through the venting structure 3 to the second pipeline assembly 5, thereby delivering it to downstream users.

[0032] In some examples, to improve the ease of use of the venting recovery device, it can be integrated into a skid-mounted structure. For instance, the venting recovery device also includes a skid, with the venting structure 3, intake structure 1, exhaust structure 2, first pipeline assembly 4, and second pipeline assembly 5 all integrated and installed within the skid. This facilitates the movement and use of the venting recovery device, enabling rapid installation of the venting recovery device with the venting pipeline and the downstream user's gas supply pipeline, reducing the workload of on-site process installation and commissioning.

[0033] In other examples, the venting and recovery device is a modular structure, with at least some of the venting structure 3, intake structure 1, exhaust structure 2, first pipeline assembly 4, and second pipeline assembly 5 connected in a detachable manner. The components are disassembled for storage to reduce storage volume, and assembled on-site for use.

[0034] In some examples, the air intake structure 1 may include a tee connector, one of which is used to connect to the air supply pipe, and the other two connectors are used to connect to the first pipe assembly 4 and the second pipe assembly 5, respectively.

[0035] In other examples, the air intake structure 1 may include an air intake pipe, one end of which is connected to the air supply pipe, and the other end of which is connected to the first piping assembly 4 and the second piping assembly 5. The configuration of the air intake pipe can improve the flexibility of the venting and recovery device connection. Specifically, since the air intake pipe has a certain length, the ease of connection between the air intake pipe and the air supply pipe can be improved by adjusting the angle and position of the air intake pipe. For example, at least a portion of the air intake pipe can be configured as a flexible hose, or the air intake pipe can be configured as a multi-segment structure with adjacent segments rotatably connected.

[0036] It should be noted that the structure of exhaust structure 2 can refer to the structure of intake structure 1 described above, and will not be repeated here.

[0037] In some examples, the vent structure 3 can be connected to the second pipeline assembly 5 via a tee fitting or by welding or other means.

[0038] In some examples, the venting structure 3 includes a fourth switching valve 31 and a check valve 32. For instance, the venting structure 3 includes a venting pipeline body, a fourth switching valve 31, and a check valve 32, with the fourth switching valve 31 and the check valve 32 connected in series through the venting pipeline body. The fourth switching valve 31 controls the connection and disconnection between the venting pipeline and the venting structure 3, and the check valve 32 prevents natural gas in the venting structure 3 from being reverse-flowed into the venting pipeline when the pressure inside the venting pipeline is low.

[0039] In some implementations, see Figure 1 The pressure regulating device 41 includes at least one pressure regulating valve.

[0040] In the above scheme, the gas supply pressure of the first pipeline assembly 4 is adjusted by at least one pressure regulating valve, thereby compensating for the fluctuation of the gas supply pressure of the second pipeline assembly 5. The structure is simple and can improve the stability of the gas supply state of the exhaust structure 2 to downstream users.

[0041] In some examples, at least one pressure regulating valve can be one, two, three, etc.

[0042] In some examples, the pressure regulating valve can be an electric pressure regulating valve 411, a manual pressure regulating valve, a pneumatic pressure regulating valve, a hydraulic pressure regulating valve, etc.

[0043] In some examples, the first pipeline assembly 4 includes a first pipeline body and a pressure regulating valve connected to the first pipeline body. One end of the first pipeline body is connected to the intake structure 1, and the other end is connected to the exhaust structure 2.

[0044] In other examples, the first piping assembly 4 includes a pressure regulating valve connected between the intake structure 1 and the exhaust structure 2.

[0045] In some implementations, see Figure 1 The number of pressure regulating valves is at least two, and at least two pressure regulating valves are connected in series.

[0046] In the above scheme, at least two pressure regulating valves are connected in series, and redundancy is formed between the at least two pressure regulating valves. When one of the pressure regulating valves fails, the gas supply pressure of the first pipeline assembly 4 can be adjusted by other pressure regulating valves to improve the stability of the gas supply pressure of the venting and recovery device to downstream users.

[0047] In some examples, the number of pressure regulating valves can be 2, 3, 4, etc., with multiple pressure regulating valves connected in series in the first pipeline body.

[0048] In some examples, the multiple pressure regulating valves can be of the same or different forms. For example, when there are two pressure regulating valves, one of them can be an automatic pressure regulating valve, and the other can be a manual pressure regulating valve. When the venting and recovery device is working, the gas supply pressure of the first pipeline assembly 4 is preferentially regulated by the automatic pressure regulating valve. When the automatic pressure regulating valve fails, the operator regulates the gas supply pressure of the first pipeline assembly 4 by using the manual pressure regulating valve.

[0049] In some examples, there are two pressure regulating valves: an electric pressure regulating valve 411 and a monitoring pressure regulating valve 412. The monitoring pressure regulating valve 412 and the electric pressure regulating valve 411 are connected in series in the first pipeline body, with the monitoring pressure regulating valve 412 located upstream of the electric pressure regulating valve 411. Under normal conditions, the monitoring pressure regulating valve 412 is normally open and does not participate in the pressure regulation of the first pipeline assembly 4. When the electric pressure regulating valve 411 fails and the pressure in the first pipeline assembly 4 exceeds the set pressure, the monitoring pressure regulating valve 412 automatically activates its pressure stabilization function.

[0050] When at least two pressure regulating valves include an electric pressure regulating valve 411 and a monitoring pressure regulating valve 412, the preset pressure set by the monitoring pressure regulating valve 412 is usually higher than that of the electric pressure regulating valve 411, so that under normal conditions, the monitoring pressure regulating valve 412 does not participate in pressure regulation, and the first pipeline assembly 4 only regulates the pressure through the electric pressure regulating valve 411. The monitoring pressure regulating valve 412 only participates in the pressure regulation in the first pipeline assembly 4 when the electric pressure regulating valve 411 fails.

[0051] In some specific examples, the pressure regulating device 41 also includes a third switching valve 413. The third switching valve 413, the monitoring pressure regulating valve 412, and the electric pressure regulating valve 411 are connected in series in the first pipeline body. Under normal operating conditions, the third switching valve 413 and the monitoring pressure regulating valve 412 are normally open, and the gas supply pressure in the first pipeline assembly 4 is adjusted only by the electric pressure regulating valve 411 to compensate for fluctuations in the gas supply pressure in the second pipeline assembly 5. When the electric pressure regulating valve 411 fails, the monitoring pressure regulating valve 412 engages to regulate the gas supply pressure in the first pipeline assembly 4. When the monitoring pressure regulating valve 412 fails and the gas supply pressure in the first pipeline assembly 4 is uncontrolled, the third switching valve 413 closes the first pipeline assembly 4 to ensure the safety of the gas supply.

[0052] In some implementations, see Figure 1 and Figure 2 The second pipeline assembly 5 includes a flow guide 51, which comprises a speed-increasing structure 511 and a speed-reducing structure 512. From the intake structure 1 to the exhaust structure 2, the speed-reducing structure 512 is located between the speed-increasing structure 511 and the exhaust structure 2, with the cross-sectional area of ​​the speed-increasing structure 511 gradually decreasing and the cross-sectional area of ​​the speed-reducing structure 512 gradually increasing. One end of the venting structure 3 is connected to the portion between the speed-increasing structure 511 and the speed-reducing structure 512, or the end of the venting structure 3 is connected to the end of the speed-reducing structure 512 facing the speed-increasing structure 511.

[0053] In the above scheme, a flow guide 51 is provided in the second pipeline assembly 5. The flow guide 51 has an acceleration structure 511 and a deceleration structure 512. The acceleration structure 511 can accelerate the flow rate of natural gas, and the deceleration structure 512 can increase the gas supply pressure from the second pipeline assembly 5 to the exhaust structure 2. After the natural gas flows through the acceleration structure 511, it forms a high-speed jet, which in turn generates a negative pressure area between the acceleration structure 511 and the deceleration structure 512. The natural gas pressure in the negative pressure area is significantly reduced. Connecting one end of the venting structure 3 to the negative pressure area can increase the pressure difference between the natural gas in the venting pipeline and the venting structure 3, thereby improving the venting efficiency and venting rate of natural gas.

[0054] In this embodiment, the pressure difference between the venting pipeline and the outlet of the venting structure 3 is increased by the diversion component 51. The increased pressure difference can accelerate the flow rate of natural gas in the venting pipeline towards the venting recovery device, thereby improving the natural gas venting efficiency. Furthermore, it can reduce the residual pressure of natural gas in the venting pipeline after the venting operation is completed, thereby increasing the natural gas venting rate.

[0055] In addition, natural gas is input into the venting and recovery device through the existing natural gas supply pipeline. By using the existing natural gas transmission pressure with the help of the diversion component 51, the venting rate and recovery efficiency of natural gas in the venting pipeline are improved. No other external kinetic energy input is required, so the venting and recovery device has the characteristics of energy saving and high efficiency.

[0056] In some examples, the second pipeline assembly 5 includes a second pipeline body and a guide member 51 connected to the second pipeline body. One end of the second pipeline body is connected to the intake structure 1, and the other end is connected to the exhaust structure 2. The venting structure 3 is connected to the portion of the guide member 51 located between the speed-up structure 511 and the speed-down structure 512, or to the end of the speed-down structure 512 facing the speed-up structure 511.

[0057] The end of the deceleration structure 512 facing the acceleration structure 511 refers to the section between the midpoint of the deceleration structure 512 along its length and the end of the deceleration structure 512 facing the acceleration structure 511.

[0058] For example, the drainage component 51 can be detachably connected to the second pipeline body through a structure such as threads or clamps, or it can be fixedly connected to the second pipeline body through welding or other means.

[0059] In other examples, the second piping assembly 5 includes a drain element 51, one end of which is connected to the intake structure 1 and the other end of which is connected to the exhaust structure 2.

[0060] In some examples, the guide element 51 includes an acceleration section, a deceleration section, and a transition section between the acceleration and deceleration sections. Along the direction from the acceleration section to the deceleration section, the cross-sectional area of ​​the acceleration section gradually decreases to form an acceleration structure 511, converting the pressure energy of the natural gas into kinetic energy, thus forming a high-speed jet. Along the direction away from the acceleration section, the cross-sectional area of ​​the deceleration section gradually increases to form a deceleration structure 512, converting the kinetic energy of the natural gas into pressure energy. The transition section is located between the acceleration and deceleration sections. At least a portion of the cross-sectional area of ​​the transition section is greater than or equal to the cross-sectional area of ​​the acceleration section near the end of the transition section. Within the transition section region, a negative pressure region is formed around the high-speed jet gas. One end of the venting structure 3 is connected to this negative pressure region, increasing the pressure difference between the natural gas in the venting pipeline and the natural gas at the outlet of the venting structure 3, thereby improving the venting efficiency and venting rate of the natural gas.

[0061] In other examples, the guide element 51 includes an acceleration section and a deceleration section, with one end of the acceleration section connected to one end of the deceleration element. Along the direction approaching the deceleration section, the cross-sectional area of ​​the acceleration section gradually decreases to form an acceleration structure 511. Along the direction away from the acceleration section, the cross-sectional area of ​​the deceleration section gradually increases to form a deceleration structure 512. The high-speed jet formed by the acceleration section creates a negative pressure zone at the end of the deceleration section facing the acceleration section. One end of the venting structure 3 is connected to this negative pressure zone to improve the venting efficiency and venting rate of the natural gas.

[0062] In some examples, in order to reduce the kinetic energy consumption during the natural gas flow process, the cross-sectional shape of the speed-up structure 511 and the speed-down structure 512 can be circular or elliptical.

[0063] In other examples, the cross-sectional shapes of the speed-up structure 511 and the speed-down structure 512 can be irregular geometries.

[0064] In some implementations, see Figure 1 and Figure 2 The drainage component 51 also includes a shell, which includes a first shell portion 513 and a second shell portion 514 located between the first shell portion 513 and the exhaust structure 2. At least a portion of the second shell portion 514 forms a deceleration structure 512. An acceleration structure 511 is housed within the first shell portion 513, and the acceleration structure 511 and the first shell portion 513 enclose a transition cavity 515. The transition cavity 515 is connected to the portion between the acceleration structure 511 and the deceleration structure 512. One end of the venting structure 3 is connected to the transition cavity 515.

[0065] In the above scheme, the acceleration structure 511 and the first shell portion 513 partially enclose a transition cavity 515, and the transition cavity 515 is connected between the acceleration structure 511 and the deceleration structure 512. In this way, the natural gas flowing through the acceleration structure 511 forms a high-speed jet at the outlet of the transition cavity 515. The high-speed jet creates a negative pressure within the transition cavity 515, connecting one end of the venting structure 3 to the transition cavity 515, thereby improving the venting efficiency and venting rate of the natural gas.

[0066] In some examples, the first shell portion 513, the second shell portion 514, and the speed-increasing structure 511 are an integral structure.

[0067] In other examples, at least part of the first shell portion 513, the speed-increasing structure 511, and the second shell portion 514 are separate structures. For example, the first shell portion 513 and the second shell portion 514 are an integral structure, with the speed-increasing structure 511 connected to the end of the first shell portion 513 away from the second shell portion 514. Alternatively, the speed-increasing structure 511 and the first shell portion 513 are an integral structure, with the first shell portion 513 connected to the second shell portion 514.

[0068] In some examples, the cross-sectional area of ​​the first shell portion 513 near the end of the second shell portion 514 is greater than the cross-sectional area of ​​the second shell portion 514 near the first shell portion 513, and the cross-sectional area of ​​the speed-increasing structure 511 towards the end of the second shell is smaller than the cross-sectional area of ​​the second shell portion 514 near the first shell portion 513, so that a transition cavity 515 is formed between the first shell portion 513 and the speed-increasing structure 511.

[0069] In some examples, along the radial direction of the guide 51, the end of the speed-increasing structure 511 near the speed-reducing structure 512 is flush with the end of the transition cavity 515 away from the speed-reducing structure 512.

[0070] In other examples, at least a portion of the speed-increasing structure 511 near the end of the speed-reducing structure 512 is located within the transition cavity 515 along the radial direction of the guide member 51.

[0071] In some examples, the venting structure 3 includes a venting pipe body, and the transition cavity 515 is provided with a connection hole, and the venting pipe body is welded to the connection hole.

[0072] In other examples, the shell also includes a third shell portion located on one side of the transition cavity 515 in the radial direction and connected to the first shell portion 513. The third shell portion forms a drainage channel, one end of which is connected to the transition cavity 515 and the other end of which is connected to the venting structure 3.

[0073] In some implementations, see Figure 1 The second pipeline assembly 5 further includes a first switching valve 52, which is connected between the guide member 51 and the intake structure 1; and / or, the second pipeline assembly 5 further includes a second switching valve 53, which is connected between the guide member 51 and the exhaust structure 2.

[0074] In the above scheme, a first switching valve 52 is installed between the inlet component 51 and the intake structure 1, which controls the gas input of the second pipeline assembly 5. A second switching valve 53 is installed between the inlet component 51 and the exhaust structure 2, which controls the gas output of the second pipeline assembly 5 to the exhaust structure 2. The installation of the first switching valve 52 and the second switching valve 53 improves the controllability of the second pipeline assembly 5, thereby reducing the fluctuation of the gas supply status to downstream users caused by air venting.

[0075] Specifically, a first switching valve 52 is installed between the inlet component 51 and the inlet structure 1. When the natural gas pressure in the venting pipeline is lower than the set pressure, the first switching valve 52 can be closed to stop the gas supply from the inlet structure 1 to the second pipeline assembly 5, preventing the natural gas in the second pipeline assembly 5 from flowing back into the venting pipeline and causing flow fluctuations in the exhaust structure 2. When the pressure in the venting pipeline is lower than the set pressure, the second switching valve 53 can be closed to prevent the natural gas supplied from the first pipeline assembly 4 to the exhaust structure 2 from flowing back into the venting structure 3, thus affecting the gas supply to downstream users.

[0076] In some examples, the second piping assembly 5 includes a first switching valve 52, a drain element 51, and a second piping body, with the first switching valve 52 and the drain element 51 connected in series via the second piping body. The first switching valve 52 is located at one end of the drain element 51 near the intake structure 1, and one end of the second piping body is connected to the intake structure 1, while the other end is connected to the exhaust structure 2.

[0077] In other examples, the second piping assembly 5 includes a drain element 51, a second switching valve 53, and a second piping body, with the drain element 51 and the second switching valve 53 connected in series through the second piping body. The second switching valve 53 is connected to the drain element 51 on the side near the exhaust structure 2, and one end of the second piping body is connected to the intake structure 1, while the other end is connected to the exhaust structure 2.

[0078] In some other examples, the second pipeline assembly 5 includes a drain element 51, a first switching valve 52, a second switching valve 53, and a second pipeline body. The first switching valve 52, the drain element 51, and the second switching valve 53 are connected in series through the second pipeline body. One end of the second pipeline body is connected to the intake structure 1, and the other end is connected to the exhaust structure 2. The first switching valve 52 is connected to the side of the drain element 51 near the intake structure 1, and the second switching valve 53 is connected to the side of the drain element 51 near the exhaust structure 2.

[0079] In some examples, the first switching valve 52 and the second switching valve 53 can be manual switching valves, electric switching valves, etc.

[0080] In some examples, both the first switching valve 52 and the second switching valve 53 are electrically operated, and a manual switching valve is connected in series between the first switching valve 52 and the guide member 51 or between the first switching valve 52 and the intake structure 1. A manual switching valve is also connected in series between the second switching valve 53 and the guide member 51 or between the second switching valve 53 and the exhaust structure 2 to create redundancy and improve the controllability of the second pipeline assembly 5.

[0081] In some implementations, see Figure 1 The venting recovery device includes a flow detection component, which is used to detect the flow rate of the exhaust structure 2.

[0082] In the above scheme, the flow rate of the exhaust structure 2 is detected by the flow detection component to avoid the flow fluctuation of the venting structure 3 from affecting the gas supply status of downstream users and to improve the stability of the gas supply of the venting structure 3.

[0083] In some examples, the flow detection component includes a flow detection element located on the exhaust structure 2. By detecting the flow rate of the exhaust structure 2, it is determined whether the gas supply flow rate to downstream users is stable, so as to adjust the gas supply flow rate of the venting and recovery device.

[0084] A flow regulating valve can be installed at the intake structure 1 to adjust the gas supply flow at the intake structure 1 based on the natural gas flow at the exhaust structure 2 detected by the flow detection device. It should be noted that the flow regulating valve can be located in the venting and recovery device or in the gas supply pipeline connected to the intake structure 1.

[0085] In some specific implementation methods, see [reference] Figure 1 The flow detection component includes a first detection element 61, which is connected to the venting structure 3; and / or, the flow detection component further includes a second detection element 62, which is connected to the intake structure 1.

[0086] In the above scheme, a first detection element 61 is installed in the venting structure 3, and a second detection element 62 is installed in the intake structure 1. The total flow rate of natural gas flowing through the first detection element 61 and the second detection element 62 is the flow rate of gas supplied to downstream users. By detecting the flow rate of the venting structure 3 in real time through the first detection element 61, the gas supply flow rate of the gas supply pipeline connected to the intake structure 1 can be controlled according to the real-time flow rate of the venting structure 3, so as to ensure the flow rate of gas supplied to downstream users and avoid fluctuations in the gas supply flow rate.

[0087] In some examples, the first detection element 61 and the second detection element 62 can be one or more combinations of differential pressure flow detection element, velocity flow detection element, and volumetric flow detection element.

[0088] In some examples, the flow detection component includes a first flow detection element connected to the vent structure 3, and the operator adjusts the natural gas flow at the intake structure 1 in real time according to the changes in the natural gas flow at the vent structure 3.

[0089] In other examples, the flow detection component includes a second detection element 62 connected to the intake structure 1. In this case, a third detection element can also be provided at the exhaust structure 2. The natural gas flow rate at the third detection element is the gas supply flow rate to downstream users. By adjusting the natural gas flow rate at the second detection element 62, the natural gas flow rate at the third detection element is kept within a preset flow rate range.

[0090] In some other examples, the flow detection component includes a first detection element 61 and a second detection element 62, the first detection element 61 being connected to the venting structure 3 and the second detection element 62 being connected to the intake structure 1.

[0091] It should be noted that the second detection element 62 can be connected to the air intake structure 1 or to the air supply pipe connected to the air intake structure 1, that is, the second detection element 62 can be part of the existing air supply pipe.

[0092] In some implementations, see Figure 1 The venting recovery device also includes a pressure detection element 7, which is connected to one of the first pipeline assembly 4, the second pipeline assembly 5, and the exhaust structure 2, and is used to detect the exhaust pressure of the exhaust structure 2.

[0093] In the above scheme, the exhaust pressure of the exhaust structure 2 is detected by the pressure detection element 7. Based on the detection result of the pressure detection element 7, the pressure regulating device 41 is controlled to adjust the gas supply pressure of the first pipeline assembly 4 to compensate for the fluctuation of the gas supply pressure of the second pipeline assembly 5. The structure is simple and improves the stability of the gas supply to downstream users.

[0094] In some examples, the pressure sensing element 7 can be a pressure gauge, a pressure transmitter, etc.

[0095] In some examples, the pressure sensing element 7 can be connected to the end of the first piping assembly 4 near the exhaust structure 2, or to the end of the second piping assembly 5 near the exhaust structure 2, or to the exhaust structure 2 itself. Since both the end of the first piping assembly 4 near the exhaust structure 2 and the end of the second piping assembly 5 near the exhaust structure 2 are connected to the exhaust structure 2, the pressure sensing element 7 can be connected to any one of the following: the end of the first piping assembly 4 near the exhaust structure 2, the end of the second piping assembly 5 near the exhaust structure 2, or the exhaust structure 2.

[0096] In some embodiments, the venting recovery device further includes a controller 8, which is electrically connected to the pressure regulating device 41 and is used to control the pressure regulating device 41 to adjust the gas supply pressure of the first pipeline assembly 4 in order to control the exhaust pressure of the exhaust structure 2.

[0097] In the above scheme, the controller 8 is electrically connected to the pressure regulating device 41, so that the controller 8 can control the pressure regulating device 41 to adjust the gas supply pressure of the first gas supply component in real time according to the exhaust pressure of the exhaust structure 2, so as to compensate for the pressure fluctuation of the second gas supply component in real time and improve the stability of the gas supply status of the venting and recovery device to downstream users.

[0098] In some examples, controller 8 can be a PLC controller 8, a remote terminal controller 8, etc.

[0099] In some examples, the controller 8 is electrically connected to the pressure regulating device 41, and the operator controls the operation of the pressure regulating device 41 by means of the controller 8 based on the pressure fluctuations of the exhaust structure 2.

[0100] In other examples, the controller 8 automatically acquires the changes in the exhaust pressure of the exhaust structure 2 and automatically controls the pressure regulating device 41 to adjust the air supply pressure of the first pipeline assembly 4.

[0101] In some specific examples, the controller 8 is electrically connected to the pressure regulating device 41, the pressure detection element 7, the first switching valve 52, the second switching valve 53, the third switching valve 413, the fourth switching valve 31, the first detection element 61, and the second detection element 62. The controller 8 controls the pressure regulating device 41 to adjust the gas supply pressure of the natural gas supplied from the first pipeline assembly 4 to the exhaust structure 2 based on the exhaust pressure of the exhaust structure 2 obtained by the pressure detection element 7. Specifically, when the exhaust pressure of the exhaust structure 2 detected by the pressure detection element 7 is less than a preset pressure, the pressure regulating device 41 increases the gas supply pressure of the first pipeline assembly 4 to bring the exhaust pressure of the exhaust structure 2 within the preset pressure range; when the exhaust pressure of the exhaust structure 2 detected by the pressure detection element 7 is greater than the preset pressure, the pressure regulating device 41 decreases the gas supply pressure of the first pipeline assembly 4 to bring the exhaust pressure of the exhaust structure 2 within the preset pressure range.

[0102] The controller 8 can also control the opening and closing of the first switching valve 52, the second switching valve 53, and the fourth switching valve 31 based on the flow rates detected by the first detection element 61 and the second detection element 62. For example, at the start of the venting operation, the controller 8 controls the fourth switching valve 31 and the second switching valve 53 to open. When the first detection element 61 detects flow in the venting structure 3, the controller 8 controls the first switching valve 52 to open, and the venting structure 3 vents the natural gas in the venting pipeline. During the venting operation, the controller 8 adjusts the pressure regulating device 41 in real time through the pressure detection element 7 to compensate for fluctuations in the gas supply status of the second pipeline assembly 5 by adjusting the gas supply status of the first pipeline assembly 4. When the first detection element 61 detects that the flow rate of the venting structure 3 is less than the preset flow rate, the controller 8 closes the first switching valve 52, the second switching valve 53, and the third switching valve 413 to prevent natural gas from the first pipeline assembly 4 from flowing into the venting structure 3.

[0103] In the description of the embodiments of this application, specific features, structures, materials or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0104] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A natural gas venting and recovery device, characterized in that, It includes a venting structure, an intake structure, an exhaust structure, and a first pipeline assembly and a second pipeline assembly connected in parallel between the intake structure and the exhaust structure. The venting structure is connected to the second pipeline assembly, and the first pipeline assembly includes a pressure regulating device.

2. The venting and recovery device according to claim 1, characterized in that, The pressure regulating device includes at least one pressure regulating valve.

3. The venting and recovery device according to claim 2, characterized in that, The number of pressure regulating valves is at least two, and at least two pressure regulating valves are arranged in series.

4. The venting and recovery device according to claim 1, characterized in that, The second pipeline assembly includes a flow guide, which includes an acceleration structure and a deceleration structure; From the intake structure to the exhaust structure, the deceleration structure is located between the acceleration structure and the exhaust structure, and the cross-sectional area of ​​the acceleration structure gradually decreases while the cross-sectional area of ​​the deceleration structure gradually increases. One end of the venting structure is connected to the portion between the speed-up structure and the speed-down structure, or one end of the venting structure is connected to the end of the speed-down structure facing the speed-up structure.

5. The venting and recovery device according to claim 4, characterized in that, The drainage component further includes a shell, the shell including a first shell portion and a second shell portion located between the first shell portion and the exhaust structure, at least a portion of the second shell portion forming the deceleration structure, the acceleration structure being housed within the first shell portion, and the acceleration structure and the first shell portion forming a transition cavity, the transition cavity communicating with the portion between the acceleration structure and the deceleration structure; One end of the venting structure is connected to the transition cavity.

6. The venting and recovery device according to claim 4, characterized in that, The second pipeline assembly also includes a first switching valve, which is connected between the drain element and the air intake structure; And / or, the second piping assembly further includes a second switching valve connected between the drain element and the exhaust structure.

7. The venting and recovery device according to any one of claims 1-6, characterized in that, The venting recovery device includes a flow detection component, which is used to detect the flow rate of the exhaust structure.

8. The venting and recovery device according to claim 7, characterized in that, The flow detection component includes a first detection element, which is connected to the venting structure; And / or, the flow detection component further includes a second detection element connected to the air intake structure.

9. The venting and recovery device according to any one of claims 1-6, characterized in that, The venting recovery device further includes a pressure detection element connected to one of the first pipeline assembly, the second pipeline assembly, and the exhaust structure, for detecting the exhaust pressure of the exhaust structure.

10. The venting and recovery device according to any one of claims 1-6, characterized in that, The venting and recovery device also includes a controller, which is electrically connected to the pressure regulating device and is used to control the pressure regulating device to adjust the gas supply pressure of the first pipeline assembly in order to control the exhaust pressure of the exhaust structure.

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