Gas phase communication device for storage tank and oil gas collection system

Abstract

The application provides a kind of tank gas phase communication device and oil gas collection system, relate to petrochemical equipment technical field.The device includes gas pipe, respectively with adjacent two the tank is communicated;Elastic hose, with the coaxial connection of gas pipe and intercommunication, the elastic hose can be telescopic along the length direction of itself, also can be deformed along the radial or circumferential direction of itself.The tank gas phase communication device and oil gas collection system provided by the application, when the pressure in gas pipe increases, the elastic hose can be stretched along the length direction with the improvement of axial stress;When gas pipe produces radial displacement or circumferential torsion due to wind blowing and other external factors, the elastic hose can produce radial displacement or circumferential torsion accordingly, and the buffering effect is played through deformation;When flash explosion or fire occurs in a certain tank, the elastic hose will preferentially break due to low strength, and the gas phase communication between adjacent tanks is disconnected in time, effectively reducing the possibility of flame spreading to other tanks along the gas pipe.

Description

Technical Field

[0001] This invention relates to the field of petrochemical equipment technology, and in particular to a gas connection device for storage tanks and an oil and gas collection system. Background Technology

[0002] Gas emissions from the breathing of oil storage tanks, the volatilization of residual oil, as well as from shutdown cleaning and the volatilization of solvents carried in the oil, are among the main sources of VOCs (Volatile Organic Compounds) in the plant area. Current VOCs treatment methods utilize gas-connected pipelines to link the entire tank group or even multiple tank groups into a unified system, classifying and categorizing VOCs to form a closed-loop oil and gas collection system, based on the characteristics of the storage medium.

[0003] Currently, flame arresters are used solely as safety isolation devices between storage tanks and the main gas collection pipeline in engineering design. This significantly impacts the safety of the oil and gas collection system. When multiple storage tanks are interconnected via the main gas collection pipeline, if a fire occurs in one tank, the flames can easily spread to other tanks and the oil and gas recovery unit through the main gas collection pipeline. Furthermore, long pipeline transport can promote the transformation of deflagration into detonation. Typically, when the flame propagation path length reaches 100 times the pipe diameter, deflagration can transform into detonation. Detonation may damage the connecting pipelines, causing leakage fires and triggering a chain fire accident. Summary of the Invention

[0004] This invention provides a gas connection device for storage tanks and an oil and gas collection system to solve the technical problems of easy flame cross-contamination and low safety in existing storage tanks.

[0005] In a first aspect, the present invention provides a tank gas connection device, connecting two adjacent tanks, comprising:

[0006] The air pipes are respectively connected to the two adjacent storage tanks;

[0007] The flexible hose is coaxially connected to and communicates with the trachea. The flexible hose can extend and retract along its length and can also deform in its radial or circumferential direction.

[0008] According to the present invention, a gas connection device for a storage tank is provided, wherein the elastic hose is a corrugated pipe and a mesh sleeve is provided on the outside of the elastic hose.

[0009] According to the present invention, a gas connection device for a storage tank further includes a support assembly. The support assembly includes a connector and a sleeve installed on the gas pipe. The connector is movably inserted into the sleeve and can move along its own axial direction within the sleeve. The central axis of the connector and the sleeve is parallel to the length direction of the elastic hose, and the connector and the sleeve are located on the periphery of the elastic hose.

[0010] According to the present invention, a gas connection device for a storage tank is provided, wherein the sum of the lengths of the connector and the sleeve is greater than the maximum length of the elastic hose.

[0011] According to the present invention, a gas connection device for a storage tank is provided, wherein the support assembly further includes a bracket, the bracket is fixed to the outer wall of the gas pipe, and the connector and / or the sleeve is hinged to the adjacent bracket.

[0012] According to the present invention, a gas connection device for a storage tank is provided, wherein the support assembly consists of two sets, and the two sets of support assemblies are arranged opposite each other along the radial direction of the gas pipe.

[0013] According to the present invention, in a gas connection device for a storage tank, the central axis of the connector or the sleeve in the two sets of support components is located on the same horizontal plane as the central axis of the gas pipe.

[0014] According to the present invention, a gas connection device for a storage tank further includes a flame arrestor assembly, which is installed on the gas pipe and includes one or more of a flame arrestor breather valve, an emergency shut-off valve, and a flame arrester.

[0015] According to the present invention, a gas connection device for a storage tank is provided, wherein the flame arrestor assembly consists of two sets, and the two sets of flame arrestor assemblies are respectively located on both sides of the elastic hose along its length.

[0016] In a second aspect, the present invention provides an oil and gas collection system, comprising multiple storage tanks and a storage tank gas connection device as described in the first aspect, wherein any two adjacent storage tanks are connected by the storage tank gas connection device.

[0017] The storage tank gas connection device and oil and gas collection system provided by this invention, by setting up an elastic hose that can extend and retract along its own length, is coaxially arranged with the gas pipe and interconnected with it, when the pressure inside the gas pipe increases, the elastic hose can stretch along its length as the axial stress increases; when the gas pipe is subjected to radial displacement or circumferential torsion due to external factors such as wind, the elastic hose can also undergo radial displacement or circumferential torsion, playing a buffering role through deformation; in the event of a flash explosion or fire in a storage tank, the top of the tank is lifted upwards, and the elastic hose, due to its lower strength, will break first, promptly disconnecting the gas connection between adjacent storage tanks, effectively reducing the possibility of flames spreading to other storage tanks along the gas pipe, improving the safety of the oil and gas collection system, and helping to avoid the occurrence of multi-tank fires. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a partial structural schematic diagram of the gas connection device for storage tanks provided by the present invention;

[0020] Figure 2 This is a schematic diagram of the oil and gas collection system provided by the present invention.

[0021] Figure label:

[0022] 10: Air tube; 20: Flexible hose; 31: Connector; 32: Sleeve; 33: Support; 41: Flame arrestor breather valve; 42: Emergency shut-off valve; 43: Flame arrester; 100: Storage tank; 101: Emergency pressure relief valve. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0024] In the description of this invention, it should be understood that the terms "upper", "lower", "inner", "outer", "axial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and 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 invention.

[0025] It should be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0026] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] The storage tank gas connection device provided by this invention connects two adjacent storage tanks 100, such as... Figure 1 As shown, the gas connection device for the storage tank includes a gas pipe 10 and a flexible hose 20.

[0028] Gas pipe 10 is connected to two adjacent storage tanks 100. A connecting pipe is installed on the top of each storage tank 100, and gas pipe 10 is connected to the connecting pipe via flanges or other connecting components, thus enabling gas connection between the two adjacent storage tanks 100. The top of each storage tank 100 is either an arched roof or an internal floating roof structure.

[0029] The flexible hose 20 is coaxially connected to and communicates with the air tube 10. The flexible hose 20 can extend and retract along its length and can also deform radially or circumferentially. Optionally, the flexible hose 20 can be made of elastic materials such as rubber or silicone, or it can be made of metal or alloy. Understandably, in actual use, the properties of the medium, hose diameter, working temperature, working pressure, connector type, displacement method, minimum bending radius, and length of the metal hose can be comprehensively considered to select a suitable flexible hose 20.

[0030] The flexible hose 20 possesses good flexibility and fatigue resistance, capable of absorbing motion deformation and cyclic loads, resisting axial, radial, and circumferential deformation, and has the ability to compensate for pipeline displacement and isolate vibration and reduce noise. It can reduce the possibility of overall mechanical damage to the gas connection device of the storage tank and reduce adverse effects on adjacent storage tanks. The flexible hose 20 has low hardness and strength; when a flash explosion or fire occurs in storage tank 100, causing the tank top to be impacted and blown open, the flexible hose 20 can preferentially break, disconnecting the connection with other storage tanks 100 and preventing flame spread and a wider accident.

[0031] The gas connection device for storage tanks provided by this invention features an elastic hose 20 that can extend and retract along its length, is coaxially arranged with and interconnects with the gas pipe 10. When the pressure inside the gas pipe 10 increases, the elastic hose 20 can stretch along its length as the axial stress increases. When the gas pipe 10 experiences radial displacement or circumferential torsion due to external factors such as wind, the elastic hose 20 can also undergo radial displacement or circumferential torsion, providing a buffering effect through deformation. In the event of a flash explosion or fire in a storage tank 100, the elastic hose 20, due to its lower strength, will break first, promptly disconnecting the gas connection between adjacent storage tanks 100. This effectively reduces the possibility of flames spreading along the gas pipe 10 to other storage tanks 100, improves the safety of the oil and gas collection system, and helps prevent group tank fires.

[0032] Furthermore, the flexible hose 20 is a corrugated pipe, and a braided sleeve is fitted on the outside of the flexible hose 20. Preferably, the flexible hose 20 is formed by high-precision plastic forming of a seamless or longitudinally welded stainless steel pipe with extremely thin walls.

[0033] The braided sleeve, fitted over the outside of the flexible hose 20, is made of stainless steel wire or steel strip and serves as the main pressure-bearing component of the flexible hose 20, protecting it. Optionally, the braided sleeve may be one layer or multiple layers.

[0034] Furthermore, the gas connection device for the storage tank also includes a support assembly, which includes a connector 31 and a sleeve 32 installed on the gas pipe 10. The connector 31 is movably inserted into the sleeve 32 and can move along its own axial direction within the sleeve 32. The central axis of the connector 31 and the sleeve 32 is parallel to the length direction of the elastic hose 20, and the connector 31 and the sleeve 32 are located on the periphery of the elastic hose 20.

[0035] The inner diameter of the sleeve 32 is larger than the outer diameter of the connector 31. The connector 31 and the sleeve 32 are coaxially arranged. The connector 31 is inserted into the sleeve 32 and can move axially. The radial cross-sections of the connector 31 and the sleeve 32 can be circular, rectangular, etc., and the present invention does not impose specific limitations.

[0036] Under normal operating conditions, the flexible hose 20 has low strength and weak pressure resistance. The connection structure from the left and right sides of the air pipe 10 to the top of the storage tank 100 is equivalent to a cantilever beam. When the distance between two adjacent storage tanks 100 is large, the air pipe 10 needs to be extended. The weight of the air pipe 10 and its components will generate a bending moment at the connection between the top of the storage tank 100 and the air pipe 10, thus causing bending stress and increasing the possibility of deformation and damage to the top of the storage tank 100. By setting up a support component, on the one hand, the bending strength of the flexible hose 20 is enhanced without affecting the rotation and extension of the flexible hose; on the other hand, the self-locking structure of the support component reduces the bending stress caused by the weight of the air pipe 10 and its components at the connection between the top of the tank and the air pipe 10, thereby improving the mechanical performance of the entire connection structure.

[0037] Furthermore, by movably inserting the connector 31 into the sleeve 32, the support assembly can also change its axial length accordingly when the elastic hose 20 undergoes axial expansion and contraction, without affecting the expansion and contraction of the elastic hose 20. When a flash explosion or fire occurs in the storage tank 100, causing the tank top to be impacted and blown open, not only will the elastic hose 20 break first, but the connector 31 can also detach from the sleeve 32, severing the connection between the accident storage tank and other storage tanks 100. This prevents the tank top of the accident storage tank from generating additional stress on the tank top of adjacent storage tanks 100 due to upward displacement, thus reducing the impact on adjacent storage tanks 100.

[0038] Specifically, the sum of the lengths of the connector 31 and the sleeve 32 is greater than the maximum length of the elastic hose 20, so that when the elastic hose 20 is in the maximum tension state, the connector 31 is still inserted in the sleeve 32. The structure is self-locked by the friction between the connector 31 and the sleeve 32, thereby reducing the bending stress generated at the connection between the tank top and the air pipe 10 due to the weight of the air pipe 10 and the components on the air pipe 10.

[0039] Furthermore, the support assembly also includes a bracket 33, which is fixed to the outer wall of the trachea 10, and the connector 31 and / or sleeve 32 are hinged to the adjacent bracket 33.

[0040] In one specific embodiment, a support assembly includes two supports 33, which are spaced apart along the length of the elastic hose 20 and located on both sides of the length of the elastic hose 20. One of the connector 31 and the sleeve 32 is fixedly connected to the adjacent support 33, and the other is hinged to the adjacent support 33. Alternatively, both the connector 31 and the sleeve 32 are hinged to the adjacent support 33.

[0041] By setting the connector 31 and / or sleeve 32 to be hinged to the bracket 33, the connector 31 and / or sleeve 32 are rotatably connected to the bracket 33. This not only does not affect the rotation and extension of the elastic hose 20, but also facilitates the rapid disengagement of the connector 31 and sleeve 32 by rotation when the top of the accident storage tank is lifted, thus avoiding additional stress on the top of the adjacent storage tank 100 due to the upward displacement of the top of the accident storage tank.

[0042] Preferably, there are two sets of support components, which are arranged opposite each other along the radial direction of the air tube 10 to enhance the support for the elastic hose 20.

[0043] In one embodiment, two sets of support components are arranged opposite each other in the vertical direction, and the two sets of support components are symmetrical about the central axis of the elastic hose 20.

[0044] In another embodiment, two sets of support components are arranged opposite each other in the horizontal direction. The two sets of support components are symmetrical about the central axis of the elastic hose 20. The central axes of the connector 31 and sleeve 32 in the two sets of support components are located on the same horizontal plane as the central axis of the air pipe 10. When the emergency storage tank is lifted upward, it is beneficial for the connector 31 and sleeve 32 to disengage quickly, avoiding obstruction of the disengagement of the connector 31 and sleeve 32 in the vertical direction.

[0045] Furthermore, the gas connection device for the storage tank also includes a flame arrestor assembly, which is installed on the gas pipe 10. The flame arrestor assembly includes one or more of the following: a flame arrestor breather valve 41, an emergency shut-off valve 42, and a flame arrester 43.

[0046] In one specific embodiment, the flame arrestor assembly includes a flame arrestor breather valve 41, an emergency shut-off valve 42, and a flame arrester 43, which are distributed sequentially at intervals from the direction away from the flexible hose 20 to the direction closer to the flexible hose 20.

[0047] The flame-arresting breather valve 41 is a breather valve with a flame-arresting function, which has both positive and negative pressure relief functions. When the positive pressure inside the storage tank 100 reaches a set value, the flame-arresting breather valve 41 opens to release gas and relieve pressure; when the negative pressure inside the storage tank 100 reaches a set value, the flame-arresting breather valve 41 opens to draw in gas to prevent negative pressure overpressure. The flame-arresting breather valve 41 can maintain the pressure balance inside the storage tank 100, effectively reduce the evaporation loss of the medium inside the tank, and prevent damage to the storage tank 100 when there is positive or negative pressure overpressure.

[0048] The emergency shut-off valve 42 is used to remotely shut off the gas connection of the storage tank 100, which facilitates the inspection and maintenance of the flame arrester 43 and the flexible hose 20, and can also prevent the spread of flames in the event of an accident.

[0049] The flame arrester 43 is used to prevent the spread of flame in the pipeline during an accident involving a single storage tank, thereby protecting adjacent storage tanks 100. Preferably, the flame arrester 43 is a detonation type flame arrester.

[0050] Among them, the top of the storage tank 100 is equipped with an emergency pressure relief valve 101. The emergency pressure relief valve 101 is a pressure safety guarantee measure for the storage tank 100. In the event that the flame arrestor breather valve 41 fails to play its protective role, the emergency pressure relief valve 101 will expel the oil and gas in the tank or draw in air to prevent the pressure of the gas phase space in the tank from exceeding the design positive and negative pressure thresholds of the storage tank.

[0051] Under normal operating conditions, when one storage tank 100 is receiving oil and another is discharging oil, the internal gas pressure of the tanks increases. The gas can then diffuse along the gas pipe 10 from the receiving tank 100 to the adjacent tank 100, reducing gas emissions into the atmosphere and preventing environmental pollution. When one of the storage tanks 100 catches fire, the internal gas pressure increases, and the flame arrestor breather valve 41 opens first. If the flame arrestor breather valve 41 cannot meet the demand, the emergency pressure relief valve 101 opens, expelling oil and gas from the tank or drawing in air to prevent the pressure in the gas phase space from exceeding the design pressure of the storage tank 100. When neither the flame arrestor breather valve 41 nor the emergency pressure relief valve 101 can meet the pressure release requirements of the storage tank 100, the emergency shut-off valve 42 and the flame arrester 43 can also function to prevent the flame from spreading to the adjacent storage tank 100.

[0052] Furthermore, there are two sets of flame arrestor components, which are located on both sides of the length of the flexible hose 20. The two sets of flame arrestor components are symmetrically distributed on the left and right sides of the gas pipe 10 to further ensure the safety of the storage tank 100.

[0053] like Figure 2 As shown, the present invention also provides an oil and gas collection system, including multiple storage tanks 100 and a storage tank gas connection device provided in any of the above embodiments, wherein any two adjacent storage tanks 100 are connected by a storage tank gas connection device.

[0054] The oil and gas collection system provided by this invention features an elastic hose 20 that can extend and retract along its length, is coaxially aligned with and interconnected with the gas pipe 10. When the pressure inside the gas pipe 10 increases, the elastic hose 20 stretches along its length due to the increase in axial stress. When the gas pipe 10 experiences radial displacement or circumferential torsion due to external factors such as wind, the elastic hose 20 also experiences radial displacement or circumferential torsion, providing a buffering effect through deformation. In the event of a flash explosion or fire in a storage tank 100, the elastic hose 20, due to its lower strength, will break first, promptly disconnecting the gas connection between adjacent storage tanks 100. This effectively reduces the possibility of flames spreading along the gas pipe 10 to other storage tanks 100, improving the safety of the oil and gas collection system and helping to prevent multi-tank fires.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gas connection device for storage tanks, connecting two adjacent storage tanks, characterized in that, include: The air pipes are respectively connected to the two adjacent storage tanks; The flexible hose is coaxially connected to and communicates with the trachea. The flexible hose can extend and retract along its own length and can also deform in its own radial or circumferential direction. A support assembly includes a connector and a sleeve installed on the trachea. The connector is movably inserted into the sleeve and is capable of moving along its own axial direction within the sleeve. The central axis of the connector and the sleeve is parallel to the length direction of the elastic hose, and the connector and the sleeve are located on the periphery of the elastic hose. The sum of the lengths of the connector and the sleeve is greater than the maximum length of the elastic hose, so that even when the elastic hose is in its maximum stretched state, the connector is still inserted in the sleeve, and the structure is self-locking through the friction between the connector and the sleeve. The support assembly further includes a bracket, which is fixed to the outer wall of the trachea, and the connector and / or the sleeve is hinged to the adjacent bracket; the support assembly consists of two sets, which are arranged opposite to each other along the radial direction of the trachea. One of the support components includes two brackets, which are spaced apart along the length of the elastic hose and located on opposite sides of the length of the elastic hose. The central axes of the connector and the sleeve in the two sets of support components are located on the same horizontal plane as the central axis of the air tube.

2. The gas connection device for the storage tank according to claim 1, characterized in that, The flexible hose is a corrugated pipe, and a mesh sleeve is fitted on the outside of the flexible hose.

3. The gas connection device for the storage tank according to claim 1, characterized in that, It also includes a flame arrestor assembly installed on the air tube, the flame arrestor assembly including one or more of a flame arrestor breathing valve, an emergency shut-off valve, and a flame arrester.

4. The gas connection device for the storage tank according to claim 3, characterized in that, The flame arrestor assembly consists of two sets, with the two sets of flame arrestor assemblies located on opposite sides of the elastic hose along its length.

5. An oil and gas collection system, characterized in that, It includes multiple storage tanks and a storage tank gas connection device as described in any one of claims 1 to 4, wherein the storage tank gas connection device is connected between any two adjacent storage tanks.

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