Small LNG (Liquefied Natural Gas) low-temperature storage tank

Abstract

The small LNG low-temperature storage tank comprises an outer tank and an inner tank, the inner tank is sleeved with the outer tank, the outer tank and the inner tank are connected through a plurality of supporting rods, the space between the outer tank and the inner tank is vacuumized, the left end of the inner tank is connected with a gas inlet pipe, the input end of the gas inlet pipe penetrates through the outer wall of the outer tank to be provided with a gas inlet valve, and the gas inlet valve is connected with a gas outlet pipe. The bottom end of the right side of the inner tank is connected with an exhaust pipe, the output end of the exhaust pipe penetrates through the outer tank to be provided with an exhaust valve, the left end and the right end of the bottom of the outer tank are fixedly connected with supporting mechanisms, buffer assemblies are installed on the supporting mechanisms, a detection assembly is installed on the top of the outer tank, and the detection end of the detection assembly is located in the inner tank. A recycling and exhausting assembly is installed at the top of the outer tank, and the input end of the recycling and exhausting assembly communicates with the interior of the inner tank. According to the utility model, the vibration force of the outer tank can be reduced, the outer tank is protected, the stability is ensured, the loss of LNG is reduced, and the loss is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of LNG storage tanks, in particular to a small LNG low-temperature storage tank. Background Art

[0002] LNG (liquefied natural gas), as a clean and efficient energy source that is colorless, odorless, non-toxic and non-corrosive, has become a new hot spot in the energy trading market. However, the main component of LNG is methane, which is a flammable and explosive substance. LNG is stored in explosion-proof tanks.

[0003] Prior art publication number CN218348424U discloses a LNG liquefied natural gas cryogenic storage tank, including an inner shell, an outer shell is mounted on the outer side of the inner shell, the outer shell and the inner shell are connected by a plurality of support blocks, the outer shell and the inner shell are vacuumed, an auxiliary discharge mechanism is installed on the outer shell, the auxiliary discharge mechanism includes a booster installed on the upper end of the outer shell, the booster is connected to the inner shell through a transmission pipeline, the booster can fill natural gas into the inner shell and increase the pressure inside the inner shell, a discharge valve is installed at the lower end of the inner shell, the outlet end of the discharge valve extends to the outer side of the outer shell, a connecting mechanism is installed on the outer shell, and the connecting mechanism includes a plurality of support frames installed on the lower surface of the outer shell. However, a large amount of BOG will be generated during use, which needs to be discharged in time, otherwise the pressure in the tank will increase and there will be a risk of explosion, and when the shock-absorbing spring is vibrated, the outer shell will swing back and forth along the guide rod through the moving plate, so it is difficult to protect the outer shell by shock absorption and buffering. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a small LNG low-temperature storage tank, which can reduce the vibration force of the outer tank, protect it, ensure stability, and reduce the loss of LNG.

[0005] In order to solve the above technical problems, the technical solutions adopted by the present utility model are as follows.

[0006] A small LNG cryogenic storage tank comprises an outer tank and an inner tank. The outer tank is sleeved on the outside of the inner tank. The outer tank and the inner tank are connected by a plurality of support rods. The outer tank and the inner tank are evacuated. The left end of the inner tank is connected with an air inlet pipe. The input end of the air inlet pipe passes through the outer wall of the outer tank and is provided with an air inlet valve. The right bottom end of the inner tank is connected with an exhaust pipe. The output end of the exhaust pipe passes through the outer tank and is provided with an exhaust valve. The left and right ends of the bottom of the outer tank are fixedly connected with a support mechanism. A buffer assembly is installed on the support mechanism. A detection assembly is installed on the top of the outer tank, and the detection end of the detection assembly is located inside the inner tank. A recovery exhaust assembly is installed on the top of the outer tank, and the input end of the recovery exhaust assembly is connected with the inside of the inner tank. The air pressure inside the inner tank is detected by the detection assembly. When it is detected that the air pressure inside the inner tank exceeds the safety index, BOG is input into the recovery exhaust assembly, which can cause part of the BOG to condense and flow back into the inner tank. The outer tank is supported by the support mechanism to ensure stability. The outer tank and the inner tank can be protected by shock absorption through the buffer assembly to improve safety.

[0007] Preferably, the supporting mechanism includes two supports, two bottom boxes, a bottom plate and a plurality of fixed blocks, the two supports are fixedly connected to the left and right sides of the bottom of the outer tank, the lower part of the supports are slidably installed inside the bottom box, the bottom end of the bottom box is fixedly connected to the top of the bottom plate, the left and right ends of the bottom plate are fixedly connected with fixed blocks, and the fixed blocks are provided with fixing holes; the bottom plate is fixed to the use platform through the fixed blocks, and the outer tank is supported by the supports and the bottom box to ensure stability during use.

[0008] Preferably, the buffer assembly includes two limit sliders, two upper push blocks, two damping rods, two springs, two lower push blocks and two lower limit sliders. Limit slide grooves are provided at the front and rear ends of the bottom of the support. The two limit sliders are slidably installed in the limit slide grooves. The bottom of the limit slider is fixedly connected with the upper push block. The inner bottom end of the bottom box is symmetrically provided with a second limit slide groove. The two lower limit sliders are slidably installed in the second limit slide groove. The top of the lower limit slider is fixedly connected with the lower push block. A damping rod is fixedly connected between the top end of the lower push block and the bottom end of the upper push block. A spring is mounted on the outer wall of the damping rod. When the support moves in the bottom box, the damping rod and the spring are used to buffer and absorb vibrations, so as to protect the outer tank and the inner tank from shock and improve safety.

[0009] Preferably, guide grooves are provided at the front and rear ends of the bottom box, and two guide plates are slidably installed in the guide grooves. The guide plates are fixedly installed on the front and rear end side walls of the support, and an articulated frame is movably installed between the upper push block and the lower push block; when the support moves in the bottom box, the limit slider and the lower limit slider are pushed to move in the limit slider, compressing the damping rod and the spring, and the upper push block and the lower push block can be linked and limited through the articulated frame to ensure stability during use.

[0010] Preferably, the detection component includes an air pressure sensor and a controller. The air pressure sensor is fixedly connected to the top of the outer tank, the detection end of the air pressure sensor is located inside the inner tank, and the controller is installed on the air pressure sensor. The air pressure inside the inner tank is detected by the air pressure sensor to prevent the air pressure inside the inner tank from exceeding a safe range, thereby improving safety.

[0011] Preferably, the recovery exhaust assembly includes a recovery box, a plurality of legs, a filling pipe, a circulation discharge pipe, a venting pipe, a solenoid valve and a gas-liquid separator. The bottom end of the recovery box is installed on the top right end of the outer tank through a plurality of legs. The top of the recovery box is installed with a filling pipe. The venting pipe is fixedly installed on the outer wall of the outer tank. The input end of the venting pipe is connected to the interior of the inner tank. The output end of the venting pipe extends into the recovery box and is connected to the circulation discharge pipe. A solenoid valve is installed on the venting pipe. The solenoid valve is electrically connected to the controller. The output end of the circulation discharge pipe passes through the outer wall of the recovery box and is installed with a gas-liquid separator. The filling pipe is opened to add liquid nitrogen into the recovery box. When it is detected that the air pressure in the inner tank exceeds the safety index, the solenoid valve is controlled to open, and BOG is input into the circulation discharge pipe through the venting pipe. When the BOG passes through the circulation discharge pipe, it is rapidly cooled by the liquid nitrogen in the recovery box, causing part of the BOG to condense and flow back into the inner tank.

[0012] Preferably, a plurality of partitions are evenly installed inside the inner tank, a notch is provided at the bottom of the partition, and circular holes are evenly opened at the upper part of the partition; the interior of the inner tank is divided into a plurality of cavities by the partition to prevent LNG from flowing in the inner tank during transportation, causing excessive inertia and affecting safety.

[0013] Due to the adoption of the above technical scheme, the technical progress achieved by the present invention is as follows.

[0014] The utility model detects the air pressure inside the inner tank through a detection component. When it is detected that the air pressure in the inner tank exceeds the safety index, BOG is input into the recovery exhaust component, which can cause part of the BOG to condense and flow back into the inner tank. The outer tank is supported by a supporting mechanism to ensure stability. The outer tank and the inner tank can be protected by a buffer component to improve safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is a schematic diagram of the axonometric structure of the utility model;

[0017] Figure 3 It is a front structural schematic diagram of the utility model;

[0018] Figure 4 It is a front cross-sectional structural schematic diagram of the utility model;

[0019] Figure 5It is a right side cross-sectional structural schematic diagram of the utility model;

[0020] Among them: 1. Outer tank; 2. Inner tank; 3. Support rod; 4. Inlet pipe; 5. Inlet valve; 6. Exhaust pipe; 7. Exhaust valve; 8. Support; 9. Limit slider; 10. Push up block; 11. Damping rod; 12. Spring; 13. Push down block; 14. Bottom box; 15. Lower limit slider; 16. Articulated frame; 17. Guide plate; 18. Bottom plate; 19. Fixed block; 20. Air pressure sensor; 21. Controller; 22. Recovery box; 23. Support leg; 24. Filling pipe; 25. Circulation discharge pipe; 26. Vent pipe; 27. Solenoid valve; 28. Gas-liquid separator; 29. ​​Partition. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0022] A small LNG cryogenic storage tank, such as Figures 1 to 5As shown, the outer tank 1 is sleeved on the outside of the inner tank 2, and the outer tank 1 and the inner tank 2 are connected by multiple support rods 3. The outer tank 1 and the inner tank 2 are evacuated, and the left end of the inner tank 2 is connected to an air intake pipe 4, and the input end of the air intake pipe 4 passes through the outer wall of the outer tank 1 and is equipped with an air intake valve 5. The right bottom end of the inner tank 2 is connected to an exhaust pipe 6, and the output end of the exhaust pipe 6 passes through the outer tank 1 and is equipped with an exhaust valve 7. A plurality of partitions 29 are evenly installed inside the inner tank 2, and the bottom of the partition 29 is provided with a notch, and the upper part of the partition 29 is evenly provided with round holes, and two supports 8 are fixedly connected to the outer tank 1. On the left and right sides of the bottom, the lower part of the support 8 is slidably installed inside the bottom box 14, and the bottom end of the bottom box 14 is fixedly connected to the top of the bottom plate 18. The left and right ends of the bottom plate 18 are fixedly connected with fixed blocks 19, and the fixed blocks 19 are provided with fixed holes. The front and rear ends of the bottom of the support 8 are provided with limited sliding grooves, and two limited sliding blocks 9 are slidably installed in the limited sliding grooves. The bottom of the limited sliding block 9 is fixedly connected with an upper push block 10. The bottom end of the bottom of the bottom box 14 is symmetrically provided with a second limited sliding groove, and two lower limited sliding blocks 15 are slidably installed in the second limited sliding groove. The top of the lower limited sliding block 15 A lower push block 13 is fixedly connected to the upper part of the outer tank 1, a damping rod 11 is fixedly connected between the top of the lower push block 13 and the bottom of the upper push block 10, a spring 12 is sleeved on the outer wall of the damping rod 11, guide grooves are provided at the front and rear ends of the bottom box 14, two guide plates 17 are slidably installed in the guide grooves, the guide plates 17 are fixedly installed on the front and rear end side walls of the support 8, an articulated frame 16 is movably installed between the upper push block 10 and the lower push block 13, an air pressure sensor 20 is fixedly connected to the top of the outer tank 1, the detection end of the air pressure sensor 20 is located inside the inner tank 2, and the air pressure sensor 20 A controller 21 is installed on it, the bottom end of the recovery box 22 is installed on the top right end of the outer tank 1 through a plurality of legs 23, a filling pipe 24 is installed on the top of the recovery box 22, and a vent pipe 26 is fixedly installed on the outer wall of the outer tank 1, the input end of the vent pipe 26 is connected to the interior of the inner tank 2, the output end of the vent pipe 26 extends into the recovery box 22 and is connected to a circulation discharge pipe 25, a solenoid valve 27 is installed on the vent pipe 26, the solenoid valve 27 is electrically connected to the controller 21, the output end of the circulation discharge pipe 25 passes through the outer wall of the recovery box 22, and is installed with a gas-liquid separator 28.

[0023] The bottom plate 18 is fixed to the use platform through the fixing block 19, and the inner tank 2 is divided into multiple cavities through the partition 29 to prevent LNG from flowing in the inner tank 2 during transportation, causing excessive inertia and affecting safety. The outer tank 1 is supported by the support 8 and the bottom box 14 to ensure stability during use. When the support 8 moves in the bottom box 14, the vibration is buffered and absorbed by the damping rod 11 and the spring 12, and the outer tank 1 and the inner tank 2 can be protected by shock absorption to improve safety. When the support 8 moves in the bottom box 14, the limit slider 9 and the lower limit slider 15 are pushed to move in the limit slide groove, compressing the damping rod 11 and the spring 1 2. The upper push block 10 and the lower push block 13 can be linked and limited by the hinge frame 16 to ensure stability during use. The air pressure inside the inner tank 2 is detected by the air pressure sensor 20 to prevent the air pressure inside the inner tank 2 from exceeding the safety range and improve safety. The filling pipe 24 is opened to add liquid nitrogen into the recovery box 22. When it is detected that the air pressure in the inner tank 2 exceeds the safety index, the solenoid valve 27 is controlled to open, and BOG is input into the circulation discharge pipe 25 through the vent pipe 26. When the BOG passes through the circulation discharge pipe 25, it is rapidly cooled by the liquid nitrogen in the recovery box 22, causing part of the BOG to condense and flow back into the inner tank 2.

[0024] like Figures 1 to 5 As shown, when the utility model is working, the bottom plate 18 is fixed to the use platform through the fixing block 19, and the interior of the inner tank 2 is divided into multiple cavities by the partition 29 to prevent the LNG from flowing in the inner tank 2 during transportation, causing excessive inertia. The outer tank 1 is supported by the support 8 and the bottom box 14, and the vibration is buffered and absorbed by the damping rod 11 and the spring 12, so as to provide shock-absorbing protection for the outer tank 1 and the inner tank 2. When the support 8 moves in the bottom box 14, it pushes the limit slider 9 and the lower limit slider 15 to move in the limit slide groove, compresses the damping rod 11 and the spring 12, and The upper push block 10 and the lower push block 13 can be linked and limited through the articulated frame 16, and the air pressure inside the inner tank 2 is detected by the air pressure sensor 20 to prevent the air pressure inside the inner tank 2 from exceeding the safety range. The filling pipe 24 is opened to add liquid nitrogen into the recovery box 22. When it is detected that the air pressure in the inner tank 2 exceeds the safety index, the solenoid valve 27 is controlled to open, and BOG is input into the circulation discharge pipe 25 through the vent pipe 26. When passing through the circulation discharge pipe 25, the BOG is rapidly cooled by the liquid nitrogen in the recovery box 22, causing part of the BOG to condense and flow back into the inner tank 2.

[0025] The air pressure sensor 20, controller 21, solenoid valve 27 and gas-liquid separator 28 of a small LNG cryogenic storage tank of the utility model are purchased on the market, and technicians in the industry only need to install and operate them according to the accompanying instruction manual, without the need for creative work by technicians in this field.

Claims

1. A small LNG cryogenic storage tank, characterized in that: The invention comprises an outer tank (1) and an inner tank (2), wherein the outer tank (1) is mounted on the outside of the inner tank (2), the outer tank (1) and the inner tank (2) are connected via a plurality of support rods (3), a vacuum is drawn between the outer tank (1) and the left end of the inner tank (2) is connected with an air intake pipe (4), the input end of the air intake pipe (4) passes through the outer wall of the outer tank (1) and is provided with an air intake valve (5), the right bottom end of the inner tank (2) is connected with an exhaust pipe (6), the output end of the exhaust pipe (6) passes through the outer tank (1) and is provided with an exhaust valve (7), the left and right ends of the bottom of the outer tank (1) are fixedly connected with a support mechanism, a buffer assembly is installed on the support mechanism, a detection assembly is installed on the top of the outer tank (1), and the detection end of the detection assembly is located inside the inner tank (2), a recovery exhaust assembly is installed on the top of the outer tank (1), and the input end of the recovery exhaust assembly is connected with the inside of the inner tank (2); The supporting mechanism comprises two supports (8), two bottom boxes (14), a bottom plate (18) and a plurality of fixing blocks (19), the two supports (8) are fixedly connected to the left and right sides of the bottom of the outer tank (1), the lower part of the supports (8) is slidably installed inside the bottom box (14), the bottom end of the bottom box (14) is fixedly connected to the top of the bottom plate (18), the left and right ends of the bottom plate (18) are fixedly connected to fixing blocks (19), and fixing holes are arranged on the fixing blocks (19); The buffer assembly comprises two limit slide blocks (9), two upper push blocks (10), two damping rods (11), two springs (12), two lower push blocks (13) and two lower limit slide blocks (15). The front and rear ends of the bottom of the support (8) are provided with limit slide grooves. The two limit slide blocks (9) are slidably installed in the limit slide grooves. The bottom of the limit slide block (9) is fixedly connected with the upper push block (10). The inner bottom end of the bottom box (14) is symmetrically provided with a second limit slide groove. The two lower limit slide blocks (15) are slidably installed in the second limit slide groove. The top of the lower limit slide block (15) is fixedly connected with the lower push block (13). The damping rod (11) is fixedly connected between the top of the lower push block (13) and the bottom end of the upper push block (10). The outer wall of the damping rod (11) is sleeved with a spring (12).

2. A small LNG cryogenic storage tank according to claim 1, characterized in that: The front and rear ends of the bottom box (14) are provided with guide slots, two guide plates (17) are slidably mounted in the guide slots, the guide plates (17) are fixedly mounted on the front and rear end side walls of the support (8), and a hinge frame (16) is movably mounted between the upper push block (10) and the lower push block (13).

3. A small LNG cryogenic storage tank according to claim 1, characterized in that: The detection component comprises an air pressure sensor (20) and a controller (21), wherein the air pressure sensor (20) is fixedly connected to the top of the outer tank (1), the detection end of the air pressure sensor (20) is located inside the inner tank (2), and the controller (21) is installed on the air pressure sensor (20).

4. A small LNG cryogenic storage tank according to claim 3, characterized in that: The recovery exhaust assembly comprises a recovery box (22), a plurality of legs (23), a filling pipe (24), a circulation discharge pipe (25), a venting pipe (26), a solenoid valve (27) and a gas-liquid separator (28). The bottom end of the recovery box (22) is mounted on the top right end of the outer tank (1) through the plurality of legs (23). The top of the recovery box (22) is mounted with a filling pipe (24). The venting pipe (26) is fixedly mounted on the outer wall of the outer tank (1). The input end of the venting pipe (26) is communicated with the interior of the inner tank (2). The output end of the venting pipe (26) extends into the recovery box (22) and is connected with the circulation discharge pipe (25). The venting pipe (26) is mounted with a solenoid valve (27). The solenoid valve (27) is electrically connected with the controller (21). The output end of the circulation discharge pipe (25) passes through the outer wall of the recovery box (22) and is mounted with a gas-liquid separator (28).

5. A small LNG cryogenic storage tank according to claim 1, characterized in that: A plurality of partitions (29) are evenly installed inside the inner tank (2), the bottom of the partitions (29) are provided with notches, and the top of the partitions (29) are evenly provided with circular holes.

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