Natural gas transfer device with explosion-proof function

Abstract

This utility model discloses a natural gas transfer device with explosion-proof function, including a transfer storage tank, a compressor connected upstream of the transfer storage tank and connected to a natural gas source, and a pressure-distributing tank. The transfer storage tank and the pressure-distributing tank are connected by a first pressure relief pipeline, which is equipped with a rupture disc to block fluid flow. The transfer storage tank is also connected to a second pressure relief pipeline arranged in parallel with the first pressure relief pipeline, which is equipped with a safety valve. The burst pressure of the rupture disc is less than the preset release pressure of the safety valve. When the pressure in the transfer storage tank reaches the burst limit of the rupture disc, the rupture disc ruptures, and some of the natural gas in the transfer storage tank can flow into the pressure-distributing tank through the first pressure relief pipeline. If the pressure in the transfer storage tank continues to rise rapidly and reaches the release pressure of the safety valve, the safety valve can automatically open, and some of the natural gas in the transfer storage tank can be quickly discharged into the atmosphere through the safety valve.

Description

Technical Field

[0001] This utility model relates to the field of natural gas production, transshipment and transportation technology, and in particular to a natural gas transshipment device with explosion-proof function. Background Technology

[0002] Natural gas goes through multiple stages during transportation and use, often requiring the use of transfer tanks for storage and transshipment. The necessity of transfer tanks is as follows: ① Enabling energy storage and peak shaving. Natural gas supply and demand often differ over time, with demand increasing significantly during the winter heating season. Therefore, natural gas can be stored in transfer tanks when supply is sufficient and released during peak demand periods, thus balancing supply and demand and ensuring energy supply stability. ② Improving transportation efficiency. When natural gas pipelines are difficult to lay due to geographical constraints, natural gas can be temporarily stored in transfer tanks and then distributed short distances via road transport, improving overall transportation flexibility and efficiency. ③ Emergency backup and safety assurance. In a natural gas supply system, transfer tanks serve as an emergency backup resource. When the main gas source experiences problems or interruptions, the supply can be quickly replenished through transfer tanks, ensuring continuous gas supply for users and improving system reliability and safety.

[0003] To ensure the safety of transit storage tanks, pressure relief valves are usually installed on them. When the pressure inside the tank exceeds the opening pressure of the pressure relief valve, the valve will automatically open to release a portion of the natural gas into the atmosphere, thereby maintaining the pressure inside the tank within a certain range.

[0004] The above methods not only cause energy loss, but also pollute the environment. Utility Model Content

[0005] This invention provides a natural gas transfer device with explosion-proof function, which solves the problem of energy waste and air pollution caused by the direct discharge of natural gas into the atmosphere during the explosion-proof depressurization process of existing transfer storage tanks.

[0006] This utility model provides a natural gas transfer device with explosion-proof function, including a compressor connected to a natural gas source, a transfer storage tank connected downstream of the compressor, and a pressure distribution tank;

[0007] The transfer storage tank and the pressure-reducing tank are connected by a first pressure relief pipeline, which is equipped with a rupture disc to block fluid flow.

[0008] The transfer storage tank is also connected to a second pressure relief pipeline that is arranged in parallel with the first pressure relief pipeline, and a safety valve is installed on the second pressure relief pipeline;

[0009] The bursting pressure of the rupture disc is less than the preset release pressure of the safety valve.

[0010] In one implementation, the first pressure relief pipeline is further provided with a first valve and a second valve, and the first valve and the second valve are respectively located upstream and downstream of the rupture disc.

[0011] In one implementation, the first pressure relief pipeline includes:

[0012] The first connecting pipe has one end connected to the transfer storage tank and the other end is equipped with a first flange;

[0013] The second pipe has one end connected to the pressure tank and the other end provided with a second flange for connecting to the first flange. The rupture disc is fixedly clamped between the first flange and the second flange.

[0014] The first valve and the second valve are installed on the first and second connecting pipes respectively.

[0015] In one implementation, the pressure-reducing tank is connected upstream of the compressor via a return pipe;

[0016] A reflux valve is installed on the reflux pipe.

[0017] In one embodiment, the top of the transfer tank is provided with a pressure relief port, and the first pressure relief pipeline and the second pressure relief pipeline are respectively connected to the pressure relief port.

[0018] As one implementation method, the pressure relief port of the transfer storage tank is sealed with a cap;

[0019] The cover is provided with a main pipe, and the first pressure relief pipe and the second pressure relief pipe are connected in parallel to the outlet end of the main pipe.

[0020] In one implementation, the safety valve is a spring-loaded safety valve.

[0021] In one implementation, the central region of the rupture disc is a raised, arched shape, with the direction of the arch protrusion being the rupture direction.

[0022] In one implementation, a crack groove is provided in the middle of the upper outer side wall of the arch, and the crack groove is radiating.

[0023] In one embodiment, the relief pressure of the safety valve is 1.2 to 1.5 times the burst pressure of the rupture disc.

[0024] Compared with the prior art, the advantages of this utility model are:

[0025] 1. As the compressor continuously compresses the delivered natural gas into the transfer storage tank, the natural gas content inside the tank continuously increases, and its internal pressure continuously rises. When the pressure inside the transfer storage tank rises to the burst limit of the rupture disc, the rupture disc ruptures. At this time, some of the natural gas in the transfer storage tank can flow into the pressure distribution tank through the first pressure relief pipeline to relieve pressure on the transfer storage tank and prevent the natural gas from being directly released into the atmosphere.

[0026] The outlet of the safety valve is connected to the external atmosphere. When the rupture disc breaks, some of the natural gas in the transfer tank can be transferred to the pressure distribution tank. If the pressure in the transfer tank continues to rise rapidly and reaches the safety valve's discharge pressure, the safety valve will automatically open, allowing some of the natural gas in the transfer tank to be quickly discharged into the atmosphere, improving pressure relief efficiency and safety. Therefore, the safety valve can serve as an emergency measure to deal with scenarios where the natural gas pressure in the transfer tank suddenly surges.

[0027] 2. Under normal conditions, the first and second valves are normally open. When the rupture disc ruptures and some natural gas in the transfer tank is released into the pressure relief tank to depressurize the transfer tank, the first and second valves need to be closed to replace the rupture disc; or when routine maintenance of the rupture disc is required, the first and second valves also need to be closed to prevent natural gas from leaking from the maintenance location of the rupture disc.

[0028] 3. When the natural gas content in the intermediate storage tank is insufficient, the pressure is low, and the rupture disc has been repaired or replaced, the reflux valve can be opened to allow the natural gas in the pressure tank to flow to the compressor through the reflux pipe. The compressor will then compress the gas into the intermediate storage tank, thus allowing the natural gas in the pressure tank to be recovered and reused. Attached Figure Description

[0029] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0030] Figure 1 This is a connection diagram of a natural gas transfer device with explosion-proof function;

[0031] Figure 2 This is a schematic diagram of the installation of the rupture disc on the first pressure relief line;

[0032] Figure 3 This is a schematic diagram of the structure of a rupture disc before detonation;

[0033] Figure 4 This is a front view of the crack grooves on the rupture disc before it explodes;

[0034] Figure 5 This is a front view of the rupture opening formed after the rupture disc explodes;

[0035] Figure 6 This is a structural diagram of a spring-loaded safety valve.

[0036] Figure label:

[0037] 1. Compressor;

[0038] 2. Transfer storage tank; 21. Pressure relief port; 22. Cover;

[0039] 3. Pressure divider tank; 31. Reflux pipe; 32. Reflux valve;

[0040] 4. First pressure relief pipeline; 41. First connecting pipe; 42. Second connecting pipe; 43. First flange; 44. Second flange; 45. First valve; 46. Second valve;

[0041] 5. Rupture disc; 51. Crack groove; 52. Damping groove; 53. Damping ring; 54. Rupture opening;

[0042] 6. Second pressure relief pipeline;

[0043] 7. Safety valve; 71. Valve cover; 72. Spring; 73. Valve stem; 731. Annular groove; 74. Valve gasket; 75. Valve body; 751. First through hole; 752. Second through hole; 753. Annular protrusion;

[0044] 8. Supervisor;

[0045] 91. First conveying pipe; 92. Second conveying pipe; 93. Connecting pipe. Detailed Implementation

[0046] The present invention will be further described below with reference to the accompanying drawings.

[0047] This utility model provides a natural gas transfer device with explosion-proof function, including a compressor 1, a transfer storage tank 2 and a pressure dividing tank 3.

[0048] The compressor 1 is connected to a first delivery pipe 91 for delivering natural gas, and the natural gas enters the compressor 1 through the first delivery pipe 91.

[0049] The outlet of compressor 1 is connected to the inlet of transfer storage tank 2 via connecting pipe 93. Compressor 1 can compress the natural gas transported by the first delivery pipe 91 into the transfer storage tank 2. A second delivery pipe 92 is provided at the outlet of transfer storage tank 2. A valve is provided on the second delivery pipe 92. The valve is normally closed. The valve on the second delivery pipe 92 is only opened when it is necessary to transfer the natural gas in the transfer storage tank 2 to downstream equipment or pipelines.

[0050] The transfer storage tank 2 and the pressure-reducing tank 3 are connected by a first pressure relief pipeline 4, which is equipped with a rupture disc 5 to block fluid flow. The transfer storage tank 2 is also connected to a second pressure relief pipeline 6, which is arranged in parallel with the first pressure relief pipeline 4. A safety valve 7 is installed on the second pressure relief pipeline 6. The bursting pressure of the rupture disc 5 is less than the preset release pressure of the safety valve 7.

[0051] As the compressor 1 continuously compresses the delivered natural gas into the transfer storage tank 2, the natural gas content in the transfer storage tank 2 continuously increases, and its internal pressure continuously rises. When the pressure inside the transfer storage tank 2 rises to the burst limit of the rupture disc 5, the rupture disc 5 ruptures. At this time, some of the natural gas in the transfer storage tank 2 can flow into the pressure distribution tank 3 through the first pressure relief pipeline 4 to relieve pressure on the transfer storage tank 2, preventing the transfer storage tank 2 from exploding under high pressure, and preventing the natural gas from being directly released into the atmosphere.

[0052] It should be noted that the outlet of safety valve 7 is connected to the external atmosphere. When the rupture disc 5 ruptures, some of the natural gas in the transfer tank 2 can be transferred to the pressure distribution tank 3. At this time, if the pressure in the transfer tank 2 continues to rise rapidly and continuously and reaches the discharge pressure of safety valve 7, safety valve 7 can automatically open, and some of the natural gas in the transfer tank 2 can be quickly discharged into the atmosphere through safety valve 7, thereby improving the pressure relief capacity and safety.

[0053] Therefore, safety valve 7 can be used as an emergency measure to deal with a sudden surge in natural gas pressure in transfer storage tank 2.

[0054] In this embodiment, the pressure divider tank 3 is connected upstream of the compressor 1 via a return pipe 31; a return valve 32 is provided on the return pipe 31. Specifically, the inlet end of the return pipe 31 is connected to the outlet end of the pressure divider tank 3, and the outlet end of the return pipe 31 is connected to the first delivery pipe 91 used for transporting natural gas.

[0055] With this setup, when the natural gas content in the intermediate storage tank 2 is insufficient, the pressure is low, and the rupture disc 5 has been repaired or replaced, the return valve 32 can be opened, allowing the natural gas in the pressure tank 3 to flow to the compressor 1 through the return pipe 31, and the compressor 1 to compress the gas into the intermediate storage tank 2. In this way, the natural gas in the pressure tank 3 can be recovered and reused.

[0056] In this embodiment, the relief pressure of the safety valve 7 can be 1.2 to 1.5 times the burst pressure of the rupture disc 5.

[0057] The following describes the components installed on the first pressure relief pipeline 4, their functions, and installation methods.

[0058] The first pressure relief pipeline 4 is also equipped with a first valve 45 and a second valve 46. The first valve 45 is located on the first pressure relief pipeline 4 and upstream of the rupture disc 5; the second valve 46 is located on the first pressure relief pipeline 4 and downstream of the rupture disc 5.

[0059] The first valve 45 and the second valve 46 can be manual valves.

[0060] Under normal conditions, the first valve 45 and the second valve 46 are normally open. When the rupture disc 5 ruptures and some of the natural gas in the transfer storage tank 2 is released into the pressure distribution tank 3 to relieve pressure on the transfer storage tank 2, the first valve 45 and the second valve 46 need to be closed to replace the rupture disc 5. Alternatively, when routine maintenance of the rupture disc 5 is required, the first valve 45 and the second valve 46 also need to be closed to prevent natural gas from leaking from the maintenance location of the rupture disc 5.

[0061] The first pressure relief pipeline 4 includes a first connecting pipe 41 and a second connecting pipe 42 connected in sequence.

[0062] One end of the first connecting pipe 41 is connected to the transfer storage tank 2, and the other end is provided with a first flange 43; one end of the second connecting pipe 42 is connected to the pressure tank 3, and the other end is provided with a second flange 44 for connecting to the first flange 43, and the rupture disc 5 is fixedly clamped between the first flange 43 and the second flange 44.

[0063] Thus, by placing the rupture disc 5 between the first flange 43 and the second flange 44, and then fixing the two flanges together with bolts, the rupture disc 5 can be clamped and fixed in place.

[0064] The first valve 45 is located at the middle of the first connecting pipe 41, and the second valve 46 is located at the middle of the second connecting pipe 42.

[0065] In this embodiment, the top of the transfer storage tank 2 is provided with a pressure relief port 21, and the first pressure relief pipeline 4 and the second pressure relief pipeline 6 are respectively connected to the pressure relief port 21.

[0066] The pressure relief port 21 of the transfer storage tank 2 is sealed with a cover 22; a main pipe 8 is installed on the cover 22, and the first pressure relief pipe 4 and the second pressure relief pipe 6 are connected to the outlet end of the main pipe 8.

[0067] With this configuration, both the first pressure relief pipeline 4 and the second pressure relief pipeline 6 are connected to the same pressure relief port 21, reducing the number of pressure relief ports 21 required and improving the sealing performance of the transfer storage tank 2.

[0068] The working principle of the explosion-proof natural gas transfer device in this embodiment is basically as follows:

[0069] Natural gas enters compressor 1 through the first delivery pipe 91, and compressor 1 compresses the natural gas into transfer storage tank 2. When the pressure in transfer storage tank 2 rises to the burst limit of rupture disc 5, rupture disc 5 ruptures, and some of the natural gas in transfer storage tank 2 can flow into pressure distribution tank 3 through the first pressure relief pipe 4 to relieve pressure in transfer storage tank 2. If the pressure in transfer storage tank 2 continues to rise rapidly and continuously and reaches the discharge pressure of safety valve 7, safety valve 7 can automatically open and quickly discharge some of the natural gas in transfer storage tank 2 into the atmosphere, improving pressure relief capacity and safety.

[0070] After depressurization is complete, close the first valve 45 and the second valve 46 to replace the rupture disc 5.

[0071] After the rupture disc 5 is repaired and replaced, if the natural gas content in the transfer storage tank 2 is insufficient or the pressure is low, the return valve 32 can be opened to allow the natural gas in the pressure tank 3 to flow into the compressor 1, and the compressor 1 will compress the gas into the transfer storage tank 2, thereby recovering and reusing the natural gas in the pressure tank 3.

[0072] The structure of rupture disc 5 is explained below, as follows: Figures 2 to 5 As shown.

[0073] like Figure 3 As shown, the central region of the rupture disc 5 is a raised arch, the height of which is 1 / 5 to 1 / 6 of the maximum diameter of the arch. The direction of the arch's protrusion is the direction of rupture.

[0074] like Figure 3 and Figure 4 As shown, a crack groove 51 is provided in the middle of the outer side wall of the arch. The crack groove 51 is radiating and can be opened by a "+" groove or "M" groove. The cross-sectional shape of the crack groove 51 is rectangular or "V" shaped, so that the diaphragm is more likely to be intact after rupture.

[0075] The thickness of the rupture disc 5 is 0.4mm to 0.7mm, and the preferred thickness of the rupture disc 5 is 0.5mm; the depth of the planar notch of the crack groove 51 is 0.05mm to 0.15mm, and the preferred notch depth is 0.1mm.

[0076] The inner and outer edges of the rupture disc 5 are respectively provided with damping grooves 52, and damping rings 53 are installed in the damping grooves 52. The width of the damping rings 53 corresponds to that of the damping grooves 52, and they are fixedly connected in the damping grooves 52.

[0077] like Figure 2As shown, the installation principle of the rupture disc 5 is as follows: The rupture disc 5 is clamped and fixed between the first flange 43 and the second flange 44, with the arched protrusion on the rupture disc 5 facing the second connecting pipe 42. After the two flanges are clamped and fixed, the damping ring 53 located inside the rupture disc 5 can cooperate to abut against the end face of the first flange 43, and the damping ring 53 located outside the rupture disc 5 can cooperate to abut against the end face of the second flange 44. In this way, the vibration of the rupture disc 5 during the explosion process can be reduced, making the rupture effect more stable and the crack more regular.

[0078] The blasting principle of the rupture disc 5 in this embodiment is as follows:

[0079] The rupture disc 5 is fixed between the first flange 43 and the second flange 44, with the arched shape on the rupture disc 5 protruding towards the second connecting pipe 42. When the pressure inside the first connecting pipe 41 reaches the burst pressure of the rupture disc 5, the natural gas inside the first connecting pipe 41 explodes and flows out along the arched direction. The crack groove 51 in the central region of the rupture disc 5 cracks outward and forms a rupture opening 54, as shown below. Figure 5 As shown. Thus, before the explosion, the rupture disc 5 can withstand greater pressure (arched part) before cracking outward along the scattering crack groove 51. At the same time, during the explosion, it can crack outward along the scattering crack groove 51, maintaining the integrity of the rupture disc 5 after the explosion, avoiding phenomena such as excessive noise and fragmentation during the explosion, thus making it safer and more reliable.

[0080] The following is an explanation of safety valve 7, such as... Figure 6 As shown.

[0081] Safety valve 7 can be a spring-loaded safety valve. Spring-loaded safety valve 7 mainly includes valve cover 71, spring 72, valve stem 73, valve pad 74, and valve body 75.

[0082] The lower end of the valve body 75 is provided with a first through hole 751, and the side wall of the valve body 75 is provided with a second through hole 752. The valve cover 71 is fixed inside the valve body 75 by threads, and a spring 72 is provided between the valve cover 71 and the valve stem 73. One end of the spring 72 elastically abuts against the valve cover 71, and the other end acts on the valve stem 73 and applies downward pressure to the valve stem 73. A valve gasket 74 is provided at the lower end of the valve stem 73, and the valve gasket 74 is used to block the first through hole 751.

[0083] The lower end of the valve stem 73 is provided with an annular groove 731, the valve pad 74 is disposed in the annular groove 731, and the upper edge of the first through hole 751 is provided with an annular protrusion 753, which is used to abut against the valve pad 74 to seal and close the first through hole 751.

[0084] The operating principle is as follows: The spring-loaded safety valve 7 is installed on the second pressure relief pipeline 6 through the first through hole 751, and the valve cover 71 is rotated and the spring 72 is compressed downward to set the pressure relief value (the pressure relief value is 1.2 to 1.5 times the burst pressure of the rupture disc 5). When the pressure in the second pressure relief pipeline 6 does not reach the set pressure relief value, under the action of the spring 72 and atmospheric pressure, the valve gasket 74 and the annular protrusion 753 form a sealed structure to prevent pressure leakage.

[0085] When the pressure exceeds the set pressure relief value, the pressure inside the equipment or pipeline exceeds the sum of atmospheric pressure and the pressure of spring 72. At this point, valve stem 73 and valve pad 74 move upwards, compressing and deforming spring 72. Natural gas enters safety valve 7 through the first through hole 751 and then exits through the second through hole 752. After pressure relief, spring 72, under its own elastic force, drives valve stem 73 and valve pad 74 to reset and seal the first through hole 751.

[0086] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A natural gas transfer device with explosion-proof function, characterized in that, This includes a transfer storage tank, a compressor connected upstream of the transfer storage tank and connected to the natural gas source, and a pressure distribution tank; The transfer storage tank and the pressure-reducing tank are connected by a first pressure relief pipeline, which is equipped with a rupture disc to block fluid flow. The transfer storage tank is also connected to a second pressure relief pipeline that is arranged in parallel with the first pressure relief pipeline, and a safety valve is installed on the second pressure relief pipeline; The bursting pressure of the rupture disc is less than the preset release pressure of the safety valve.

2. The natural gas transfer device with explosion-proof function according to claim 1, characterized in that, The first pressure relief pipeline is also equipped with a first valve and a second valve, which are located upstream and downstream of the rupture disc, respectively.

3. The natural gas transfer device with explosion-proof function according to claim 2, characterized in that, The first pressure relief pipeline includes: The first connecting pipe has one end connected to the transfer storage tank and the other end is equipped with a first flange; The second pipe has one end connected to the pressure tank and the other end provided with a second flange for connecting to the first flange. The rupture disc is fixedly clamped between the first flange and the second flange. The first valve and the second valve are installed on the first and second connecting pipes respectively.

4. The natural gas transfer device with explosion-proof function according to any one of claims 1-3, characterized in that, The pressure-reducing tank is connected upstream of the compressor via a return pipe; A reflux valve is installed on the reflux pipe.

5. The natural gas transfer device with explosion-proof function according to any one of claims 1-3, characterized in that, The top of the transfer tank is equipped with a pressure relief port, and the first pressure relief pipeline and the second pressure relief pipeline are respectively connected to the pressure relief port.

6. The natural gas transfer device with explosion-proof function according to claim 5, characterized in that, The pressure relief port of the transfer storage tank is sealed with a cover; The cover is provided with a main pipe, and the first pressure relief pipe and the second pressure relief pipe are connected in parallel to the outlet end of the main pipe.

7. The natural gas transfer device with explosion-proof function according to claim 1, characterized in that, The safety valve is a spring-loaded safety valve.

8. The natural gas transfer device with explosion-proof function according to claim 1, characterized in that, The central area of ​​the rupture disc is a raised, arched shape, and the direction of the arched shape is the direction of rupture.

9. The natural gas transfer device with explosion-proof function according to claim 8, characterized in that, A crack groove is provided in the middle of the outer side wall of the arch, and the crack groove is radiating.

10. The natural gas transfer device with explosion-proof function according to claim 1, characterized in that, The relief pressure of the safety valve is 1.2 to 1.5 times the burst pressure of the rupture disc.

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