Low-temperature gas emptying and dispersing device for large low-temperature storage tank

Abstract

The utility model discloses a low-temperature gas emptying and dispersing device for a large low-temperature storage tank, which relates to the field of gas emptying and dispersing devices and comprises a mounting plate used for being mounted on a support and provided with a through hole, and an emptying pipe is mounted in the through hole; one side of the connecting plate is connected with one side of the mounting plate, and the blow-down pipe is located above the connecting plate; one side of the steering plate is connected with the other opposite side of the connecting plate, and the steering plate obliquely extends upwards along the connecting plate; and an exhaust port of the blow-down pipe is located between the mounting plate and the steering plate, and when the blow-down pipe exhausts air, the air can be dispersed upwards along the inner side face of the steering plate. According to the blow-down pipe, the platy structure is arranged on the blow-down pipe, and the inclined upward steering plate is arranged, so that the purpose of reducing flowing of diffused flash steam sinking to a layer close to the ground is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of gas emptying dispersion device, concretely relates to a low temperature gas emptying dispersion device for large low temperature storage tank. BACKGROUND

[0002] The field-assembled vertical cylindrical flat-bottom steel low-temperature liquefied gas storage tank (hereinafter referred to as a large low-temperature storage tank) as the main storage equipment of an LNG liquefaction plant is an important equipment connecting upstream production and downstream users, and accounts for a relatively high proportion in the total investment of the station, so that countries around the world attach great importance to the design and construction of the storage tank. At the same time, the design and construction standards for large low-temperature storage tanks have been updated and implemented in China in July 2022, and the structure and type are more reliable, and the construction of the large low-temperature storage tank industry in China is in the peak period in recent years.

[0003] The large low-temperature storage tank is a normal pressure storage tank, and the design pressure thereof is about 25KPa. In order to prevent overpressure of the storage tank, the diffusing pressure of the automatic emptying pipeline on the tank top platform is usually set to 20KPa. When the pressure in the tank exceeds this value, the diffusing control valve is automatically opened to reduce the tank pressure to ensure safety. In the current industry, the emptying port on the automatic emptying pipeline is designed as a horizontal pipe to avoid rain and snow from entering the pipe and causing ice blockage. However, the diffused low-temperature gas is mostly LNG flash steam in a deep cooling state, and the density of the flash steam is heavier than that of the surrounding air when the temperature of the flash steam is lower than -113℃. In addition, the diffusing amount is large when the control valve is fully opened (for example, for a 20,000m LNG low-temperature storage tank, the control valve is automatically opened for emptying when the tank pressure reaches the set value of 20KPa, and the control valve is closed to stop emptying when the tank pressure is 8KPa. The EAG diffusing amount is about 2200Nm 3 ), and a large amount of low-temperature gas steam cloud diffused through the horizontal diffusing port will sink to a layer near the ground, which brings great safety hazards to the surrounding production.

[0004] Therefore, the present application is proposed. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a low temperature gas emptying dispersion device for large low temperature storage tank, which sets a plate structure on the emptying pipe and sets an upwardly inclined deflection plate to solve the problem of safety hazards caused by the sinking of a part of the low-temperature flash steam to a layer near the ground during the diffusing of the low-temperature flash steam in the prior art.

[0006] The utility model embodiment realizes the following technical scheme: the utility model embodiment provides a low temperature gas emptying dispersion device for large low temperature storage tank, which comprises:

[0007] The mounting plate is used for being mounted on the support, and a through hole is formed in the mounting plate, and an emptying pipe is mounted in the through hole;

[0008] The connection plate is connected with one side of the mounting plate, and the vent pipe is located above the connection plate;

[0009] The turning plate is connected with the other opposite side of the connection plate, and the turning plate extends upwardly and obliquely along the connection plate;

[0010] The exhaust port of the vent pipe is located between the mounting plate and the turning plate, and when the vent pipe exhausts, the gas can be dispersed upwardly along the inner side of the turning plate.

[0011] Optionally, the mounting plate is perpendicular to the connection plate, the axis of the vent pipe is perpendicular to the mounting plate, and the angle between the turning plate and the connection plate is greater than 90° and less than 180°.

[0012] Optionally, the angle between the turning plate and the connection plate is greater than 140° and less than 150°.

[0013] Optionally, the through hole is circular, the vent pipe is cylindrical, the inner diameter of the through hole is 2-3 mm larger than the outer diameter of the vent pipe, and the vent pipe penetrates through the through hole.

[0014] Optionally, the bottom rib plate is further included, the lower end of the bottom rib plate is connected with the connection plate, the upper end of the bottom rib plate is connected with the lower end of the vent pipe, one side of the bottom rib plate is connected with the mounting plate, and the other side of the bottom rib plate is connected with the turning plate.

[0015] Optionally, the two side rib plates are further included, the two side rib plates are connected with the side of the vent pipe and the mounting plate at the same time, and the two side rib plates are arranged at opposite sides of the vent pipe.

[0016] Optionally, the top rib plate is further included, the lower end of the top rib plate is connected with the top of the vent pipe, and the two sides of the top rib plate are connected with the mounting plate and the turning plate respectively.

[0017] Optionally, the two side rib plates are in the same horizontal plane as the central axis of the vent pipe.

[0018] Optionally, the top rib plate is in the same vertical plane as the central axis of the vent pipe.

[0019] Optionally, the center of the through hole coincides with the center of the mounting plate.

[0020] Compared with the prior art, the embodiment of the utility model has the following advantages and beneficial effects:

[0021] The low-temperature gas venting dispersion device for large low-temperature storage tanks provided by the embodiment of the utility model, when the pressure in the storage tank reaches a set value (such as 20KPa), the automatic diffusion control valve is opened, the low-temperature gas enters the venting dispersion device through the venting pipe, the gas is sprayed from the exhaust port of the venting pipe and directly sprayed to the inner side surface of the deflection plate. The embodiment of the utility model is inclined due to the design of the deflection plate, the gas flows along the inner side surface of the deflection plate after being sprayed to the deflection plate, thereby changing the diffusion direction of the gas and making the gas diffuse upward, the gas is fully mixed with the surrounding air during the rising process, gradually reduces the density of the gas and avoids sinking to the vicinity of the ground, thereby reducing the security risks to the surrounding environment and personnel. Meanwhile, the structure of the venting dispersion device is a plate type structure, which is beneficial to draining water and can avoid rainwater gathering at a low place.

[0022] Generally, the low-temperature gas venting dispersion device for large low-temperature storage tanks provided by the embodiment of the utility model is provided, the venting dispersion device is provided with a plate type structure on the venting pipe and an upwardly inclined deflection plate, so as to achieve the purpose of reducing the sinking of the diffusion flash steam to the ground. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can be obtained without creative labor on the basis of the drawings.

[0024] Figure 1 The structure schematic view of the low-temperature gas venting dispersion device for large low-temperature storage tanks provided by the embodiment of the utility model is provided.

[0025] Figure 2 The connection structure schematic view of the connecting plate and the deflection plate provided by the embodiment of the utility model is provided.

[0026] Figure 3 The mounting plate structure schematic view provided by the embodiment of the utility model is provided.

[0027] The marks in the drawings and the corresponding names of parts are as follows:

[0028] 1-mounting plate, 2-bracket, 3-through hole, 4-venting pipe, 5-connecting plate, 6-deflection plate, 7-bottom rib plate, 8-side rib plate, 9-top rib plate. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0031] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0032] In the description of the present application, it should be noted that the terms "first", "second", "third" and the like are only used to distinguish description, and cannot be understood as indicating or implying relative importance.

[0033] Embodiments

[0034] As Figure 1As shown in the utility model embodiment, the low-temperature gas venting and dispersing device for the large low-temperature storage tank comprises a mounting plate 1, a connecting plate 5 and a deflection plate 6. The mounting plate 1 is used for being mounted on a support 2, and a through hole 3 is formed in the mounting plate 1. A venting pipe 4 is mounted in the through hole 3, and the mounting plate 1 provides stable support for the venting pipe 4, so that the venting pipe 4 will not shake or displace during the exhaust process. It should be noted that the mounting plate 1 and the support 2 can be mounted on the support 2 by means of bolts, welding, bonding or other fixing methods, which are not limited here, as long as the purpose of sufficient installation stability can be achieved. One side of the connecting plate 5 is connected to one side of the mounting plate 1, and the venting pipe 4 is located above the connecting plate 5. The venting pipe 4 is a channel for low-temperature gas, and is used for discharging low-temperature gas in the storage tank. The exhaust port of the venting pipe 4 is located between the mounting plate 1 and the deflection plate 6. One side of the deflection plate 6 is connected to the other side of the connecting plate 5 opposite to the one side, and the deflection plate 6 extends upwardly along the connecting plate 5. The venting pipe 4 is fixed to the mounting plate 1 through the through hole 3, and the exhaust port of the venting pipe 4 faces the deflection plate 6, so that the gas can be directly sprayed to the inner side of the deflection plate 6, thereby realizing upward dispersion of the gas. In the utility model embodiment, the connecting plate 5 is used for connecting the mounting plate 1 and the deflection plate 6, and plays a role of support and positioning, so that the deflection plate 6 will not deform or displace when the gas is sprayed. The deflection plate 6 is used for changing the spraying direction of the low-temperature gas, so that the low-temperature gas is dispersed upwardly along the inner side of the deflection plate 6, thereby avoiding sinking of the gas to the ground. The gas is fully mixed with the surrounding air during the rising process, gradually reduces the density of the gas, avoids sinking of the gas to the ground, and thereby reduces the safety hazards to the surrounding environment and personnel.

[0035] It should be noted that the connection mode of the mounting plate 1 and the connecting plate 5 and the connection mode of the connecting plate 5 and the deflection plate 6 are not limited here, and can be bonding, welding, clamping or other connection modes, or can be an integral structure, as long as the purpose of sufficient connection stability can be achieved. In order to improve the installation stability between the venting pipe 4 and the mounting plate 1, a rib plate structure can be provided for stability.

[0036] Exemplarily, as shown in the utility model embodiment, Figure 3 The mounting plate 1 is a rectangular structure, a through hole 3 is formed in the mounting plate 1, and the through hole 3 is a circular structure, the center of which coincides with the center of the mounting plate 1, and Figure 1As shown, the vent pipe 4 is a cylindrical structure, the vent pipe 4 penetrates the through hole 3, and the exhaust port of the vent pipe 4 faces the deflection plate 6. It should be noted that in other embodiments, the shape of the mounting plate 1 is not limited to a rectangular shape, and the mounting plate 1 can be provided in a circular shape, an irregular plate structure, etc., which can solve the technical problems of the embodiments of the utility model. Similarly, the shape of the through hole 3 and the shape of the vent pipe 4 are not limited in other embodiments, as long as the purpose of smoothly venting and dispersing low-temperature gas and installing stability can be achieved. At the same time, the through hole 3 is not limited to being arranged at the center position of the mounting plate 1. In the embodiments of the utility model, the through hole 3 is arranged at the center position of the mounting plate 1, which can improve the installation stability of the device.

[0037] As a preferred embodiment of the utility model, the mounting plate 1, the connecting plate 5, the deflection plate 6 and the vent pipe 4 of the device can be made of low-temperature-resistant S30408 stainless steel plate, which can meet the strength and rigidity required by the device. When selecting materials, the thickness of the mounting plate 1, the connecting plate 5 and the deflection plate 6 is preferably greater than or equal to the wall thickness of the vent pipe 4, which can improve the support stability.

[0038] In the embodiments of the utility model, the inner diameter of the through hole 3 is 2-3mm larger than the outer diameter of the vent pipe 4, which can ensure that the vent pipe 4 is smoothly installed in the through hole 3, and avoid a large amount of low-temperature gas from diffusing between the through hole 3 and the vent pipe 4 and then flowing to the ground surface.

[0039] In order to improve the installation stability of the vent pipe 4 in the through hole 3, the mounting plate 1 of the utility model is sleeved and assembled on the vent pipe 4 as a supporting component during assembly, and the outer diameter of the vent pipe 4 is used as a reference direction during assembly. Along the outer diameter of the vent pipe 4, the bottom rib plate 7 is spot-welded at the bottom positioning point, and then the connecting plate 5 is horizontally assembled and welded under the bottom rib plate 7. The bottom rib plate 7 and the connecting plate 5 are positioned and welded at one end of the mounting plate 1, and the other end is connected and welded with the core component of the device, the deflection plate 6. The connecting plate 5 plays a protective and supporting role, and the bottom rib plate 7 plays a connecting and reinforcing role for the structure.

[0040] More preferably, along the outer diameter of the vent pipe 4, and along the horizontal direction of the center line, the two side plates 8 are positioned and spot-welded on the left and right sides of the vent pipe 4, that is, the two side plates 8 are in the same horizontal plane as the center axis of the vent pipe 4, in order to further improve the stability of the support, the two side plates 8 can be respectively arranged on the opposite sides of the vent pipe 4, and of course, in other embodiments, the included angle between the two side plates 8 is not limited; along the vertical direction of the center line, the top plate 9 is positioned and spot-welded at the top of the vent pipe 4, that is, the two side plates 8 are in the same horizontal plane as the center axis of the vent pipe 4. One end of the two side plates 8 and the top plate 9 is positioned and assembled with the support part mounting plate 1, and the other end is connected and assembled with the core part of the device, the turning plate 6, the side plate 8, the top plate 9 and the bottom plate 7 all play a connecting and reinforcing role in the structure, and the support 2 plays a supporting role in the whole device of the vent pipe 4. The various parts in the low-temperature gas venting and dispersing device are respectively fully welded and connected, and the parts in contact with the vent pipe 4 are all fully welded and connected, which not only improves the stability of the whole device, but also improves the installation stability of the vent pipe 4.

[0041] It should be noted that in other embodiments, the top plate 9, the side plate 8 and the bottom plate 7 can be arranged according to actual needs, as long as the purpose of supporting and stabilizing the vent pipe 4 can be achieved, for example, in another embodiment, only the top plate 9 can be arranged, and the side plate 8 and the bottom plate 7 are not arranged, or only the side plate 8 can be arranged, and the number of the side plate 8 is not limited, or only one side plate 8 can be arranged, or three, four or other numbers of side plates 8 can be arranged. Similarly, the contact surface or contact point of the top plate 9, the side plate 8 and the bottom plate 7 with the vent pipe 4, the connecting plate 5 and the turning plate 6 is not limited to only welding, but can also use bonding, clamping, bolt connection and other methods, which are not limited here.

[0042] Further, as shown in Figure 1 and Figure 2 , the mounting plate 1 can be arranged perpendicular to the connecting plate 5, the axis of the vent pipe 4 is perpendicular to the mounting plate 1, and the included angle between the turning plate 6 and the connecting plate 5 is greater than 90° and less than 180°. Preferably, the included angle between the turning plate 6 and the connecting plate 5 is greater than 140° and less than 150°. Exemplarily, the turning plate 6 and the connecting plate 5 are arranged at an obtuse angle of 145°, which can change the direction of the low-temperature dispersing gas, which can not only ensure the smooth release of the low-temperature gas, but also ensure that most of the low-temperature gas flows along the turning plate 6 to the oblique upward direction.

[0043] Generally, when LNG flash steam in the tank is flashed at a set pressure for safe release, the low-temperature gas release dispersion device of the embodiment of the present application installed at the position of the horizontal vent can change the flow direction of most EAG (i.e. low-temperature release gas) to be obliquely upwardly injected and released, thereby avoiding the safety hazard caused by the direct floating and gathering of the cryogenic flash steam with a density greater than air to the ground. The device is suitable for all low-temperature storage equipment provided with a horizontal vent, can meet the use requirements in different environments, has a relatively simple structure, has a low manufacturing cost, and is suitable for batch manufacturing.

[0044] Meanwhile, the plate type design of the embodiment of the present application is conducive to draining water, and can avoid the collection of rainwater at a low place. If the structure is a groove type, the collected rainwater is not easy to drain, and when the pressure in the tank is at a set value and is released by the low-temperature gas release dispersion device, the rainwater in the groove will be instantaneously condensed into ice blocks with high hardness under the scouring of the cryogenic flash steam, thereby affecting the performance of the device.

[0045] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that the structures or components shown in the drawings are not necessarily drawn to scale, and the present application omits the description of known components and processing technologies and processes to avoid unnecessary limitation of the present application.

Claims

1. A low-temperature gas venting dispersion device for a large low-temperature storage tank, characterized by, The utility model relates to a kind of exhaust pipe installation structure, including: Mounting plate (1) for installing on support (2), the through hole (3) is opened in the mounting plate (1), and vent pipe (4) is installed in the through hole (3); Connecting plate (5) is connected with one side of the mounting plate (1) one side, and the vent pipe (4) is located above the connecting plate (5); The turning plate (6) is connected with the other opposite side of the connecting plate (5) one side, and the turning plate (6) is inclined to extend upwards along the connecting plate (5); Wherein, the vent pipe (4) exhaust port is located between the mounting plate (1) and the turning plate (6), when the vent pipe (4) exhausts, gas can be dispersed upwards along the inside of the turning plate (6).

2. A low-temperature gas venting dispersion device for a large low-temperature storage tank according to claim 1, characterized by The mounting plate (1) is perpendicular to the connecting plate (5), the axis of the vent pipe (4) is perpendicular to the mounting plate (1), and the included angle between the turning plate (6) and the connecting plate (5) is greater than 90 °, and less than 180 °.

3. A low-temperature gas venting dispersion device for a large low-temperature storage tank according to claim 2, characterized in that, The included angle between the turning plate (6) and the connecting plate (5) is greater than 140 °, and less than 150 °.

4. A low-temperature gas venting dispersion device for a large low-temperature storage tank according to claim 1, characterized by The through hole (3) is circular, the vent pipe (4) is cylindrical, the inner diameter of the through hole (3) is greater than the outer diameter of the vent pipe (4) 2-3mm, and the vent pipe (4) penetrates the through hole (3).

5. A low-temperature gas venting dispersion device for a large low-temperature storage tank according to claim 4, characterized in that, It also includes bottom rib plate (7), the lower end of the bottom rib plate (7) is connected with the connecting plate (5), and the upper end thereof is connected with the lower end of the vent pipe (4), one side of the bottom rib plate (7) is connected with the mounting plate (1), and the other side thereof is connected with the turning plate (6).

6. A low-temperature gas venting dispersion device for a large low-temperature storage tank according to claim 5, characterized by It also includes two side rib plates (8), both of the two side rib plates (8) are connected with the side of the vent pipe (4) and the mounting plate (1) simultaneously, and the two side rib plates (8) are arranged on the opposite sides of the vent pipe (4) respectively.

7. A low-temperature gas venting dispersion device for a large low-temperature storage tank according to claim 6, characterized in that, It also includes top rib plate (9), the lower end of the top rib plate (9) is connected with the top of the vent pipe (4), and the two sides of the top rib plate (9) are connected with the mounting plate (1) and the turning plate (6) respectively.

8. A low-temperature gas venting dispersion device for a large low-temperature storage tank according to claim 6, characterized by The two side rib plates (8) are in the same horizontal plane with the central axis of the vent pipe (4).

9. A low-temperature gas venting dispersion device for a large low-temperature storage tank according to claim 7, characterized by The top rib plate (9) is in the same vertical plane with the central axis of the vent pipe (4).

10. A low-temperature gas venting dispersion device for a large low-temperature storage tank according to claim 4, characterized by The center of the through hole (3) coincides with the center of the mounting plate (1).

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