BOG recovery device for LNG storage tank

Abstract

The utility model relates to the technical field of LNG storage tanks, and discloses an LNG storage tank BOG recovery device which comprises a recovery cylinder and two bases, the front side of the recovery cylinder is fixedly connected with a gas inlet pipeline, the right side of the gas inlet pipeline is fixedly connected with a cleaning mechanism, the front side of the recovery cylinder is fixedly connected with a gas outlet pipeline, and the right side of the gas outlet pipeline is fixedly connected with a cleaning mechanism. Buffer mechanisms are arranged at the bottoms of the air inlet pipeline and the air outlet pipeline; and the cleaning mechanism comprises a square shell, the left side of the square shell is fixedly connected to the outer wall of the right side of the air inlet pipeline, and the inner wall of the bottom of the air inlet pipeline is fixedly connected with a filter plate. According to the BOG gas recovery device, impurities attached to the filter plate can be removed in time, BOG gas can smoothly enter the recovery barrel through the gas inlet pipeline, the gas recovery efficiency is effectively guaranteed, and compared with a traditional manual cleaning device or a device lacking an automatic cleaning function, the manual maintenance cost and the downtime are greatly reduced; and the continuity and the stability of equipment operation are improved.

Description

Technical Field

[0001] This utility model relates to the field of LNG storage tank technology, and in particular to an LNG storage tank BOG recovery device. Background Technology

[0002] LNG storage tanks are specialized equipment used to store liquefied natural gas (LNG). They need to be able to adapt to the low temperature storage conditions of LNG at around -160℃, have a large storage capacity, and have high safety performance (such as explosion-proof, fire-proof, and leak-proof). They come in various structural types, such as above-ground cylindrical, underground, and membrane types, and are equipped with complex systems for liquid inlet, liquid outlet, vaporization, and safety monitoring.

[0003] A typical LNG storage tank BOG recovery unit is a device that recovers evaporative gas (BOG) from LNG storage tanks. By collecting BOG from the tank, it is processed through compression, cooling, and reliquefaction to convert it into liquefied natural gas or other usable energy forms for reuse or safe discharge. It consists of a compressor, heat exchanger, reliquefaction unit, storage tank, and control system, and is used in LNG receiving terminals, gas stations, and industrial fields to reduce energy waste and environmental pollution.

[0004] In the LNG (liquefied natural gas) storage sector, the effective recovery and utilization of BOG (boil-off gas) is crucial for improving energy efficiency, reducing operating costs, and minimizing environmental pollution. However, existing LNG storage tank BOG recovery devices have several problems. On one hand, in the gas filtration stage, most devices use fixed filter plate structures and lack automatic cleaning functions. With prolonged use, the filter plates are easily clogged by impurities, leading to increased gas flow resistance and reduced recovery efficiency. Therefore, this LNG storage tank BOG recovery device is proposed to address these issues. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides an LNG storage tank BOG recovery device, which aims to improve the problem of low recovery efficiency caused by the lack of automatic cleaning function of filter plates in some existing BOG recovery devices.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An LNG storage tank BOG recovery device includes a recovery cylinder and two bases. An air inlet pipe is fixedly connected to the front side of the recovery cylinder, a cleaning mechanism is fixedly connected to the right side of the air inlet pipe, and an air outlet pipe is fixedly connected to the front side of the recovery cylinder. Both the air inlet pipe and the air outlet pipe are equipped with a buffer mechanism at their bottoms.

[0008] The cleaning mechanism includes a square shell. The left side of the square shell is fixedly connected to the right outer wall of the air intake pipe. A filter plate is fixedly connected to the bottom inner wall of the air intake pipe. A drive assembly is fixedly connected inside the square shell. A rotating rod is rotatably connected to the inner wall of the square shell. Connecting rods are fixedly connected to both the front and rear sides of the rotating rod. A cylindrical block is fixedly connected to the left side of the connecting rod. A spring is fixedly connected to the bottom inner wall of the cylindrical block. A sliding column is fixedly connected to the top of the spring. A spherical block is fixedly connected to the top of the sliding column.

[0009] As a further description of the above technical solution:

[0010] The drive assembly includes an electric motor, the top of which is fixedly connected to the inner top wall of the square shell. A turntable is fixedly connected to the drive end of the electric motor. A sliding rod is slidably connected to the inner wall of the turntable. A collar is fixedly connected to the bottom of the sliding rod. Transmission plates are fixedly connected to the left and right sides of the outer side of the rotating rod. A transmission rod is fixedly connected to the top of the two transmission plates on the side close to each other.

[0011] As a further description of the above technical solution:

[0012] The inner wall of the collar is slidably connected to the outer wall of the transmission rod, and the top inner wall of the sliding rod is in contact with the top side of the turntable;

[0013] As a further description of the above technical solution:

[0014] The outer wall of the sliding column is slidably connected to the inner wall of the cylindrical block, and the top sides of the two spherical blocks are in contact with the bottom side of the filter plate.

[0015] As a further description of the above technical solution:

[0016] The buffer mechanism includes two arc-shaped plates. The tops of the two arc-shaped plates are fixedly connected to the bottom of the air inlet pipe and the air outlet pipe. A rotating seat is rotatably connected to the bottom of the arc-shaped plates. A sleeve is fixedly connected to the bottom end of the rotating seat. A compression spring column is slidably connected to the bottom inner wall of the sleeve. A second spring is sleeved on the outside of the compression spring column. A circular plate is fixedly connected to the top of the compression spring column. A support seat is rotatably connected to the bottom of the compression spring column. A damper is fixedly connected to the bottom of both the air inlet pipe and the air outlet pipe.

[0017] As a further description of the above technical solution:

[0018] A spring three is fixedly connected to the top of the circular plate, and the top side of the spring three is fixedly connected to the top inner wall of the sleeve.

[0019] As a further description of the above technical solution:

[0020] The outer wall of the circular plate is slidably connected to the inner wall of the sleeve, the bottom side of the second spring is fixedly connected to the bottom inner wall of the sleeve, and the top side of the second spring is fixedly connected to the bottom inner wall of the circular plate.

[0021] As a further description of the above technical solution:

[0022] The bottom ends of the two dampers are fixedly connected to the top of the front base, and the bottoms of the four support seats are fixedly connected to the top of the front base.

[0023] This utility model has the following beneficial effects:

[0024] 1. In this utility model, an electric motor serves as the power source, driving the turntable, sliding rod, collar, and other components to work together. This causes the rotating rod to rotate, which in turn causes the spherical block to reciprocate and scrape the filter plate under the action of the spring. This automatic cleaning method can promptly remove impurities attached to the filter plate, preventing gas flow obstruction caused by impurities. It ensures that BOG gas smoothly enters the recovery cylinder through the intake pipe, effectively guaranteeing gas recovery efficiency. Compared with traditional manual cleaning or devices lacking automatic cleaning functions, it significantly reduces manual maintenance costs and downtime, and improves the continuity and stability of equipment operation.

[0025] 2. In this utility model, the arc-shaped plate is rotatably connected to the rotating seat, which can initially buffer the vibration energy through angle changes when the pipeline vibrates; the compression spring column, spring two, spring three and the circular plate inside the sleeve cooperate with each other to absorb vertical vibration by utilizing the elastic deformation of the spring; the damper converts the vibration kinetic energy into heat energy to further weaken the vibration amplitude. The multi-stage buffer structure works in concert to effectively reduce the impact and damage of vibration on the pipeline and connecting parts, reduce the probability of problems such as pipeline loosening and component wear caused by vibration, extend the service life of the air inlet pipe, air outlet pipe and the entire recovery device, reduce equipment replacement and maintenance costs, and improve the reliability and safety of the device operation. Attached Figure Description

[0026] Figure 1 This is a perspective view of the LNG storage tank BOG recovery device proposed in this utility model;

[0027] Figure 2 This is a schematic diagram of the air inlet pipe of the LNG storage tank BOG recovery device proposed in this utility model.

[0028] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0029] Figure 4This is a schematic diagram of the cylindrical block structure of the LNG storage tank BOG recovery device proposed in this utility model;

[0030] Figure 5 for Figure 2 Enlarged view of point B in the middle.

[0031] Legend:

[0032] 1. Recycling cylinder; 2. Base; 3. Inlet pipe; 4. Outlet pipe; 5. Square shell; 6. Filter plate; 7. Electric motor; 8. Turntable; 9. Sliding rod; 10. Collar; 11. Transmission rod; 12. Transmission plate; 13. Rotating rod; 14. Connecting rod; 15. Cylindrical block; 16. Spring 1; 17. Sliding column; 18. Spherical block; 19. Arc plate; 20. Rotating seat; 21. Sleeve; 22. Compression spring column; 23. Spring 2; 24. Spring 3; 25. Support seat; 26. Damper. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Reference Figure 1 , Figure 2 and Figure 3 This utility model provides an embodiment of an LNG storage tank BOG recovery device, including a recovery cylinder 1 and two bases 2. An air inlet pipe 3 is fixedly connected to the front side of the recovery cylinder 1, and a cleaning mechanism is fixedly connected to the right side of the air inlet pipe 3. The recovery cylinder 1, as the core storage component of the entire device, is used to receive and temporarily store BOG gas entering from the air inlet pipe 3, providing a safe storage space for the internal gas and laying the foundation for subsequent gas treatment and recycling, ensuring the smooth progress of the BOG recovery process. An air outlet pipe 4 is fixedly connected to the front side of the recovery cylinder 1. Buffer mechanisms are provided at the bottom of both the air inlet pipe 3 and the air outlet pipe 4. The two bases 2 play a key role in supporting the entire device, providing a stable installation foundation for components such as the recovery cylinder 1, air inlet pipe 3, and air outlet pipe 4. By fixing the device to the bases 2, the shaking during device operation can be effectively reduced, enhancing the stability of the overall structure.

[0035] The cleaning mechanism includes a square shell 5. The left side of the square shell 5 is fixedly connected to the right outer wall of the air intake pipe 3. A filter plate 6 is fixedly connected to the bottom inner wall of the air intake pipe 3. The main function of the filter plate 6 is to filter impurities in the BOG gas, preventing impurities from entering the recovery cylinder 1 and affecting subsequent processing. By intercepting solid particles and impurities in the gas, the purity of the recovered gas is ensured. A drive assembly is fixedly connected inside the square shell 5. The drive assembly includes an electric motor 7. The top of the electric motor 7 is fixedly connected to the top inner wall of the square shell 5. A turntable 8 is fixedly connected to the drive end of the electric motor 7. The electric motor 7 serves as the power source for the cleaning mechanism. After starting, it... The drive end drives the turntable 8 to rotate. A sliding rod 9 is slidably connected to the inner wall of the turntable 8. The top inner wall of the sliding rod 9 contacts the top side of the turntable 8. When the turntable 8 rotates, it drives the sliding rod 9, which is slidably connected to the inner wall, to slide up and down. A collar 10 is fixedly connected to the bottom of the sliding rod 9. Transmission plates 12 are fixedly connected to the left and right sides of the outer side of the rotating rod 13. A transmission rod 11 is fixedly connected to the side of the top of the two transmission plates 12 that are close to each other. The inner wall of the collar 10 is slidably connected to the outer wall of the transmission rod 11. The collar 10 can slide along the transmission rod 11. The sliding rod 9 plays the role of transmitting power and changing the direction of motion, converting the circular motion of the turntable 8 into the motion of the collar 10 along the transmission rod 11. The linear motion of the transmission rod 11 is connected to the rotating rod 13 via the inner wall of the square shell 5. The square shell 5 serves as the main frame of the cleaning mechanism, housing the drive assembly, rotating rod 13, and other components, providing installation space and a protective barrier to prevent external impurities and dust from entering. The transmission plate 12 is connected to the transmission rod 11, transmitting the power of the transmission rod 11 to the rotating rod 13, enabling the rotating rod 13 to rotate stably. Connecting rods 14 are fixedly connected to both the front and rear sides of the rotating rod 13. A cylindrical block 15 is fixedly connected to the left side of the connecting rod 14. The function of the connecting rod 14 is to convert the rotational motion of the rotating rod 13 into the rotation of the cylindrical block 15. The cylindrical block 15 moves up and down repeatedly with the rotating rod 13 through the connection and transmission of the connecting rod 14. A spring 16 is fixedly connected to the inner wall of the bottom of the cylindrical block 15, and a sliding column 17 is fixedly connected to the top of the spring 16. The outer wall of the sliding column 17 is slidably connected to the inner wall of the cylindrical block 15. A spherical block 18 is fixedly connected to the top of the sliding column 17. The top sides of the two spherical blocks 18 are in contact with the bottom side of the filter plate 6. When the rotating rod 13 drives the cylindrical block 15 to move, the elasticity of the spring 16 ensures that the spherical blocks 18 can effectively knock and scrape the filter plate 6, enhance the cleaning effect, and at the same time avoid damage to the filter plate 6.

[0036] Reference Figure 1 , Figure 2 and Figure 4The buffer mechanism includes two arc-shaped plates 19. The tops of the two arc-shaped plates 19 are fixedly connected to the bottoms of the air inlet pipe 3 and the air outlet pipe 4. A rotating seat 20 is rotatably connected to the bottom of the arc-shaped plates 19. When the pipe vibrates, the arc-shaped plates 19 can rotate around the rotating seat 20, absorbing and dispersing vibration energy by changing their own angle, thus providing initial buffering for the pipe. A sleeve 21 is fixedly connected to the bottom end of the rotating seat 20. A compression spring post 22 is slidably connected to the inner wall of the bottom of the sleeve 21. A spring is sleeved on the outside of the compression spring post 22. A circular plate is fixedly connected to the top of spring 23 and compression spring post 22. The bottom side of spring 23 is fixedly connected to the bottom inner wall of sleeve 21, and the top side of spring 23 is fixedly connected to the bottom inner wall of the circular plate. The outer wall of the circular plate is slidably connected to the inner wall of sleeve 21. A spring 3 24 is fixedly connected to the top of the circular plate, and the top side of spring 3 24 is fixedly connected to the top inner wall of sleeve 21. Sleeve 21 houses compression spring post 22, spring 23, spring 3 24, and the circular plate, providing mounting space for these cushioning components. In the spatial and motion track, when the pipeline vibrates, the compression spring column 22 moves up and down under the action of spring 23 and spring 3 24. Through its own sliding and the elastic deformation of the spring, it absorbs vibration energy. The circular plate plays the role of connecting and transmitting force, transferring the elastic force of spring 23 and spring 3 24 to the compression spring column 22. At the same time, under the action of the spring, it works with the compression spring column 22 to buffer and absorb the pipeline vibration, reduce the vertical vibration of the pipeline, and reduce the impact of vibration on the pipeline. The bottom of the compression spring column 22 is rotatably connected to the support seat 25. The bottom of the four support seats 25 is fixedly connected to the top of the front base 2. The bottom of the air inlet pipe 3 and the air outlet pipe 4 are both fixedly connected to the damper 26. The bottom ends of the two dampers 26 are fixedly connected to the top of the front base 2. The function of the damper 26 is to convert the kinetic energy generated by the pipeline vibration into heat energy and dissipate it. Through the damping effect, it further weakens the vibration amplitude of the pipeline. Working together with the spring and other buffer components, it improves the overall shock absorption performance of the buffer mechanism and protects the pipeline and connecting components from vibration damage.

[0037] Working principle: When the electric motor 7 is started, its drive end drives the turntable 8 to rotate. The sliding rod 9, which is slidably connected to the inner wall of the turntable 8, moves with the turntable 8. The collar 10 fixed at the bottom of the sliding rod 9 slides along the transmission rod 11. The transmission rod 11 is connected to the transmission plates 12 on both sides of the outer side of the rotating rod 13, thereby driving the rotating rod 13 to rotate on the inner wall of the square shell 5. The connecting rods 14 on the front and rear sides of the rotating rod 13 move accordingly, driving the cylindrical block 15 to move. The spring 16 on the inner wall of the bottom of the cylindrical block 15 is connected to the sliding column 17, so that the spherical block 18 is in close contact with the bottom of the filter plate 6 under the elastic force of the spring 16. As the rotating rod 13 rotates, the spherical block 18 reciprocates at the bottom of the filter plate 6. Through the elastic knocking and scraping of the spring 16, the impurities attached to the filter plate 6 are shaken off and removed, ensuring the permeability of the filter plate 6 and maintaining the smooth flow of BOG gas through the air inlet pipe 3 into the recovery cylinder 1.

[0038] The arc-shaped plate 19 fixed at the bottom of the air inlet pipe 3 and the air outlet pipe 4 is rotatably connected to the rotating seat 20. When the pipe vibrates due to gas flow or equipment operation, the arc-shaped plate 19 can rotate flexibly around the rotating seat 20 to initially buffer the vibration. Inside the sleeve 21 connected to the bottom of the rotating seat 20, the compression spring column 22 can slide up and down inside the sleeve 21 under the synergistic action of spring 23, spring 3 24 and the circular plate. Spring 23 and spring 3 24 absorb vibration energy through elastic deformation, reducing the vertical vibration amplitude of the pipe. At the same time, the damper 26 fixed at the bottom of the air inlet pipe 3 and the air outlet pipe 4 converts the vibration kinetic energy, further weakening the vibration. The support seat 25 is firmly connected to the front base 2, providing stable support for the entire buffer mechanism, so that the arc-shaped plate 19, the rotating seat 20, the sleeve 21 and other components work together to continuously and effectively reduce pipe vibration, reduce damage to the pipe and connecting components, and extend the service life of the equipment.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An LNG storage tank BOG recovery device, comprising a recovery cylinder (1) and two bases (2), characterized in that: An air inlet pipe (3) is fixedly connected to the front side of the recycling cylinder (1), a cleaning mechanism is fixedly connected to the right side of the air inlet pipe (3), an air outlet pipe (4) is fixedly connected to the front side of the recycling cylinder (1), and a buffer mechanism is provided at the bottom of both the air inlet pipe (3) and the air outlet pipe (4). The cleaning mechanism includes a square shell (5), the left side of which is fixedly connected to the right outer wall of the air intake pipe (3), a filter plate (6) is fixedly connected to the bottom inner wall of the air intake pipe (3), a drive assembly is fixedly connected inside the square shell (5), a rotating rod (13) is rotatably connected to the inner wall of the square shell (5), a connecting rod (14) is fixedly connected to both the front and rear sides of the rotating rod (13), a cylindrical block (15) is fixedly connected to the left side of the connecting rod (14), a spring (16) is fixedly connected to the bottom inner wall of the cylindrical block (15), a sliding column (17) is fixedly connected to the top of the spring (16), and a spherical block (18) is fixedly connected to the top of the sliding column (17).

2. The LNG storage tank BOG recovery device according to claim 1, characterized in that: The drive assembly includes an electric motor (7), the top of which is fixedly connected to the inner top wall of the square shell (5). The drive end of the electric motor (7) is fixedly connected to a turntable (8). A sliding rod (9) is slidably connected to the inner wall of the turntable (8). A collar (10) is fixedly connected to the bottom of the sliding rod (9). Transmission plates (12) are fixedly connected to the left and right sides of the outer side of the rotating rod (13). A transmission rod (11) is fixedly connected to the top of the two transmission plates (12) on the side with similar tops.

3. The LNG storage tank BOG recovery device according to claim 2, characterized in that: The inner wall of the collar (10) is slidably connected to the outer wall of the transmission rod (11), and the top inner wall of the sliding rod (9) is in contact with the top side of the turntable (8).

4. The LNG storage tank BOG recovery device according to claim 1, characterized in that: The outer wall of the sliding column (17) is slidably connected to the inner wall of the cylindrical block (15), and the top sides of the two spherical blocks (18) are in contact with the bottom side of the filter plate (6).

5. The LNG storage tank BOG recovery device according to claim 1, characterized in that: The buffer mechanism includes two arc-shaped plates (19). The tops of the two arc-shaped plates (19) are fixedly connected to the bottom of the air inlet pipe (3) and the air outlet pipe (4). The bottom of the arc-shaped plates (19) is rotatably connected to a rotating seat (20). The bottom end of the rotating seat (20) is fixedly connected to a sleeve (21). The inner wall of the bottom of the sleeve (21) is slidably connected to a compression spring column (22). A second spring (23) is sleeved on the outside of the compression spring column (22). The top of the compression spring column (22) is fixedly connected to a circular plate. The bottom of the compression spring column (22) is rotatably connected to a support seat (25). The bottoms of the air inlet pipe (3) and the air outlet pipe (4) are both fixedly connected to a damper (26).

6. The LNG storage tank BOG recovery device according to claim 5, characterized in that: A spring three (24) is fixedly connected to the top of the circular plate, and the top side of the spring three (24) is fixedly connected to the top inner wall of the sleeve (21).

7. The LNG storage tank BOG recovery device according to claim 5, characterized in that: The outer wall of the circular plate is slidably connected to the inner wall of the sleeve (21), the bottom side of the second spring (23) is fixedly connected to the bottom inner wall of the sleeve (21), and the top side of the second spring (23) is fixedly connected to the bottom inner wall of the circular plate.

8. The LNG storage tank BOG recovery device according to claim 5, characterized in that: The bottom ends of the two dampers (26) are fixedly connected to the top of the front base (2), and the bottoms of the four support seats (25) are fixedly connected to the top of the front base (2).

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