Natural gas liquefaction heat preservation storage device and using method

Abstract

The invention belongs to the technical field of natural gas liquefaction and heat preservation storage, and particularly relates to a natural gas liquefaction and heat preservation storage device and a using method.The natural gas liquefaction and heat preservation storage device comprises a box body, a liquid inlet is fixedly connected to the upper surface of the box body, a liquid outlet pipe is arranged on one side of the liquid inlet, and a scraping assembly is arranged in the liquid outlet pipe; the scraping assembly is used for scraping corrosive substances on the inner wall of the liquid outlet pipe, the scraping assembly comprises a connecting shaft rotationally arranged on the bottom wall of the liquid outlet pipe, a cleaning ring is arranged on the circumferential surface of the connecting shaft in a reciprocating sliding mode, the circumferential surface of the cleaning ring abuts against the inner wall of the liquid outlet pipe, and then the inner wall of the liquid outlet pipe is scraped; a sealing piece is arranged on the inner wall of the box body, the sealing piece is used for sealing the bottom wall of the liquid outlet pipe, the sealing piece comprises a connecting ring arranged in the box body in a sliding mode, and the connecting ring can be connected with the bottom end of the liquid outlet pipe in an inserted mode. The problem that a large number of corrosives are attached to the interior of a pipeline in the storage box body after long-time use is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of natural gas liquefaction thermal insulation storage, and in particular relates to a natural gas liquefaction thermal insulation storage device and a use method thereof. Background Art

[0002] Liquefied natural gas (LNG) vaporizes rapidly at room temperature and pressure, so it must be stored at low temperatures and normal pressure. To ensure its stability and reduce evaporation losses, thermal insulation is crucial. This measure also effectively mitigates potential safety risks and ensures the safe storage of LNG.

[0003] The existing process for liquefied natural gas (LNG) storage involves pre-processing the extracted natural gas to remove impurities. The pre-treated natural gas is then pressurized by a compressor and fed into a cooling system. Using multi-stage cooling technology, the natural gas is gradually cooled to near its liquefaction point. At each cooling stage, a portion of the natural gas begins to liquefy, while the remaining unliquefied gas continues to the next cooling stage, absorbing and removing the heat from the natural gas. When the natural gas is cooled to a sufficiently low temperature, it will eventually fully liquefy. At this point, the LNG is stored in specialized insulated tanks, typically double-walled with an insulating material such as perlite or polyurethane foam.

[0004] However, during the use of existing natural gas liquefaction insulation storage devices, because the natural gas storage tanks are used for a long time and have interlayers, they are not often disassembled for maintenance. This leads to the internal liquid outlet pipelines being corroded and damaged to a certain extent on the inner wall of the pipelines after long-term use, resulting in the mixing of pipeline corrosion products or external pollutants during the natural gas transportation process, resulting in the problem of reducing the purity of the liquefied natural gas and possibly causing the problem of accelerated pipeline corrosion.

[0005] To this end, the present invention provides a natural gas liquefaction heat preservation storage device and a method of use. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows: a natural gas liquefied heat preservation storage device and a method of use according to the present invention comprises a box body, a liquid inlet is fixedly connected to the upper surface of the box body, a liquid outlet pipe is provided on one side of the liquid inlet, a scraping assembly is provided inside the liquid outlet pipe, the scraping assembly is used to scrape off corrosion products on the inner wall of the liquid outlet pipe, the scraping assembly comprises a connecting shaft rotatably provided on the bottom wall of the liquid outlet pipe, a cleaning ring is provided on the circumferential surface of the connecting shaft for reciprocating sliding, the circumferential surface of the cleaning ring abuts against the inner wall of the liquid outlet pipe, thereby scraping the inner wall of the liquid outlet pipe; The inner wall of the box body is provided with a sealing member, which is used to seal the bottom wall of the liquid outlet pipe. The sealing member includes a connecting ring slidably provided inside the box body, and the connecting ring can be plugged into the bottom end of the liquid outlet pipe; Complete the sealing work on the bottom end of the liquid outlet pipe.

[0008] Preferably, the scraping assembly also includes a base plate fixedly connected to the top of the liquid outlet pipe, the upper surface of the base plate is fixedly connected to a first motor, the output end of the first motor is fixedly connected to a rotating plate, the upper surface of the rotating plate is provided with a first hydraulic cylinder, the output end of the first hydraulic cylinder is rotatably connected to a rotating column, the bottom end of the rotating column is fixedly connected to an insert block, the lower surface of the insert block is provided with a slot, the top end of the connecting shaft is fixedly connected to a protrusion, the lower surface of the rotating plate is fixedly connected to a second motor, the output end of the second motor is transmission-connected to a transmission belt, and the transmission belt is transmission-connected to the rotating column.

[0009] Preferably, when the liquid outlet pipe is scraped, the first motor is started first, and the rotation of the first motor drives the rotating plate to rotate to the top of the liquid outlet pipe. At this time, the first hydraulic cylinder is started again, and the first hydraulic cylinder drives the plug-in block at its output end to move downward, so that the slot provided on the lower surface of the plug-in block is plugged into the protrusion. After the plug-in block and the protrusion are plugged in, the second motor is started, and the start of the second motor drives the transmission belt to perform transmission work, and the transmission belt then drives the rotating column connected to the output end of the first hydraulic cylinder to rotate. The rotation of the rotating column drives the plug-in block to rotate, and then drives the protrusion plugged in with the plug-in block. The rotation of the protrusion then drives the connecting shaft fixed to its bottom end to rotate. The connecting shaft is a reciprocating screw, which drives the cleaning ring sliding on its circumferential surface to move up and down to perform scraping work.

[0010] Preferably, the cross-sections of the slot and the protrusion are both in the shape of a straight line, thereby being able to complete the plug-in operation and simultaneously drive the connecting shaft to drive the cleaning ring to perform the scraping operation.

[0011] Preferably, the sealing member comprises a second hydraulic cylinder fixed to the inner wall of the box body, the output end of the second hydraulic cylinder is fixed to a fixing column, the top end of the fixing column is fixed to a connecting ring, and the connecting ring is used to seal the liquid outlet pipe.

[0012] Preferably, a plurality of spray holes are provided inside the connecting ring, and a water inlet pipe is provided inside the box body. A multi-section telescopic tube is fixedly connected to one side of the water inlet pipe, and the multi-section telescopic tube is fixedly connected to the connecting ring. The water inlet pipe is used to introduce a cleaning agent to assist in cleaning the corrosive substances on the inner wall of the liquid outlet pipe.

[0013] Preferably, a spiral rod is fixed to the bottom surface of the liquid outlet pipe, the bottom end of the spiral rod is inserted into a positioning hole opened on the surface of the fixed column, and a sealing disk is rotatably connected to the surface of the spiral rod, and the sealing disk is used to seal the spray hole.

[0014] Preferably, before scraping and cleaning the liquid outlet pipe, first start the second hydraulic cylinder to push the connecting ring on the upper surface of the fixed column to seal the bottom end of the liquid outlet pipe. During the sealing process, the connecting ring can push the sealing disk to move upward along the spiral rod, and the spiral rod is passively inserted into the positioning hole while the position of the spiral rod remains unchanged. The sealing disk rotates during the upward movement of the spiral rod. During the rotation, the sealing disk releases the seal on the spray hole. When the connecting ring is fully connected with the liquid outlet pipe, the sealing disk is fully opened, so that the spray hole can spray out the detergent, and the auxiliary cleaning ring scrapes the inner wall of the liquid outlet pipe.

[0015] A method for using a natural gas liquefied thermal insulation storage device, comprising the following steps: Step 1: Filling with liquefied natural gas: First, connect the external liquefied natural gas tank to the annular groove 212 of the liquid storage box 1 through the feed pipe, open the liquid inlet 11, and inject liquefied natural gas into the liquid storage box 1. After the injection is completed, close the sealing valve and disconnect the connecting pipeline; Step 2: Operation and insulation: Start the water pump in the cooling tank and send the coolant into the interlayer of the liquid storage tank 1 through the water inlet pipe 37. After heat exchange, the coolant returns to the cooling tank through the water outlet pipe to achieve circulation and insulation.

[0016] Step 3: End of transportation and discharge: After the transportation is completed, the liquefied natural gas is discharged into the external natural gas tank through the liquid outlet pipe 12, the sealing valve and the water pump are closed, and the pipeline connection is disconnected.

[0017] Preferably, the step 2 of ending transportation and discharge is specifically that after the transportation and discharge are completed, when cleaning the storage box 1, the connecting ring 32 of the seal is first started to seal the bottom end of the liquid outlet rod, and then the scraping component is started to clean the inner wall of the liquid outlet pipe 12.

[0018] The beneficial effects of the present invention are as follows: 1. The invention discloses a natural gas liquefied heat preservation storage device and a method for using the device. The liquefied natural gas is injected into the tank through the liquid inlet for storage. When the liquefied natural gas needs to be taken out, the liquefied gas will flow out through the liquid outlet pipe. The scraping assembly provided inside the liquid outlet pipe plays a key role. The connecting shaft drives the cleaning ring to slide back and forth on the inner wall of the liquid outlet pipe. This reciprocating motion ensures that the cleaning ring can fully and effectively scrape off the corrosive substances on the inner wall of the liquid outlet pipe, preventing the corrosive substances from further eroding the inner wall of the liquid outlet pipe, ensuring that the liquid outlet pipe is unobstructed. At the same time, the sealing of the inner wall of the tank is The components ensure the sealing of the bottom end of the liquid outlet pipe. The plug-in design of the connecting ring and the bottom end of the liquid outlet pipe makes the sealing effect more reliable, avoids the leakage of liquefied natural gas, and improves the safety of storage. The device effectively solves the problem of accumulation of corrosion products on the inner wall of the liquid outlet pipe through the design of the scraping component, extends the service life of the liquid outlet pipe, and reduces maintenance costs. At the same time, the setting of the seal enhances the sealing performance of the bottom end of the liquid outlet pipe, ensures the safe storage of liquefied natural gas, and avoids safety hazards caused by leakage. In addition, the device has a simple structure, is easy to operate, and is easy to maintain and service.

[0019] 2. The present invention discloses a natural gas liquefaction insulation storage device and method of use. Through the coordinated operation of a first motor, a first hydraulic cylinder, and a second motor, this device automatically scrapes away corrosive materials from the inner wall of the liquid outlet pipe, improving scraping efficiency and reducing the complexity of manual operation. A reciprocating screw, acting as a connecting shaft, ensures stable and continuous up and down movement of the cleaning ring on the inner wall of the liquid outlet pipe, thereby achieving comprehensive scraping of corrosive materials. Furthermore, the plug-in design of the plug and protrusion ensures the stability and reliability of the scraping operation, avoiding problems such as poor scraping results or equipment damage caused by loose connections.

[0020] 3. The natural gas liquefied insulation storage device and usage method described in the present invention ensures smooth cleaning and avoids leakage of the cleaning agent by pushing the connecting ring to seal the bottom end of the liquid outlet pipe through the second hydraulic cylinder before scraping and cleaning the inner wall of the liquid outlet pipe. At the same time, the connecting ring pushes the sealing disk to rise along the spiral rod and rotate to open the spray hole, cleverly achieving the timed and quantitative spraying of the cleaning agent, which not only saves the use of cleaning agent, but also enhances the cleaning effect, improves the degree of automation of the cleaning work, and reduces the difficulty and cost of manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 is a perspective view of embodiment 1 of the present invention; Figure 2 It is a structural diagram of the main body of the present invention; Figure 3It is a structural schematic diagram of the bottom plate of the present invention; Figure 4 It is a cross-sectional view of the box body of the present invention; Figure 5 It is a structural schematic diagram of the annular groove of the present invention; Figure 6 It is a structural schematic diagram of the liquid outlet pipe of the present invention; Figure 7 It is a structural schematic diagram of the connecting shaft of the present invention; Figure 8 It is a structural schematic diagram of the connecting ring of the present invention.

[0023] In the figure: 1, box body; 11, liquid inlet; 12, liquid outlet pipe; 2. Bottom plate; 21. First motor; 22. Rotating plate; 23. Second motor; 24. Drive belt; 25. First hydraulic cylinder; 26. Rotating column; 27. Insert block; 28. Slot; 29. ​​Protrusion; 210. Connecting shaft; 211. Cleaning ring; 212. Annular groove; 3. Second hydraulic cylinder; 31. Fixed column; 32. Connecting ring; 33. Screw rod; 34. Sealing disk; 35. Positioning hole; 36. Spray hole; 37. Water inlet pipe; 38. Multi-section telescopic tube. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0025] Example 1: Figures 1 to 8 As shown, a natural gas liquefied heat-insulated storage device and a method of use described in an embodiment of the present invention include a box body, a liquid inlet is fixedly connected to the upper surface of the box body, a liquid outlet pipe is provided on one side of the liquid inlet, and a scraping assembly is provided inside the liquid outlet pipe. The scraping assembly is used to scrape off corrosive substances on the inner wall of the liquid outlet pipe. The scraping assembly includes a connecting shaft rotatably provided on the bottom wall of the liquid outlet pipe, and a cleaning ring is provided on the circumferential surface of the connecting shaft for reciprocating sliding. The circumferential surface of the cleaning ring abuts against the inner wall of the liquid outlet pipe, thereby scraping off the inner wall of the liquid outlet pipe; a sealing member is provided on the inner wall of the box body, and the sealing member is used to seal the bottom wall of the liquid outlet pipe. The sealing member includes a connecting ring slidably provided inside the box body, and the connecting ring can be plugged into the bottom end of the liquid outlet pipe to complete the sealing work of the bottom end of the liquid outlet pipe.

[0026] Specifically, in existing liquefied natural gas insulation storage devices, because the natural gas storage tanks are used for a long time and have interlayers, they are not often disassembled for maintenance. As a result, the internal liquid outlet pipeline will be corroded and damaged over time. This causes pipeline corrosion products or external contaminants to mix into the natural gas during transportation, resulting in reduced purity of the liquefied natural gas and possibly accelerated pipeline corrosion. Therefore, the present invention sets a corresponding structure to solve the above problems. First, liquefied natural gas is injected into the tank through the liquid inlet for storage. When the liquefied natural gas needs to be taken out, the liquefied gas will flow out through the liquid outlet pipe, and the scraping component set inside the liquid outlet pipe plays a key role. The connecting shaft drives the cleaning ring to slide back and forth on the inner wall of the liquid outlet pipe. This reciprocating motion ensures that the cleaning ring can fully and effectively scrape off the corrosive substances on the inner wall of the liquid outlet pipe, preventing the corrosive substances from further eroding the inner wall of the liquid outlet pipe, ensuring that the liquid outlet pipe is unobstructed. At the same time, the sealing of the inner wall of the tank The seal ensures the sealing of the bottom end of the liquid outlet pipe. The plug-in design of the connecting ring and the bottom end of the liquid outlet pipe makes the sealing effect more reliable, avoids the leakage of liquefied natural gas, and improves the safety of storage. The design of the scraper component effectively solves the problem of corrosion accumulation on the inner wall of the liquid outlet pipe, extends the service life of the liquid outlet pipe, and reduces maintenance costs. At the same time, the setting of the seal enhances the sealing performance of the bottom end of the liquid outlet pipe, ensures the safe storage of liquefied natural gas, and avoids safety hazards caused by leakage. In addition, the device has a simple structure, is easy to operate, and is easy to maintain and service. The problem of a large amount of corrosive substances adhering to the inside of the pipes in the storage box after long-term use is solved.

[0027] like Figure 3 As shown, the scraping assembly of this embodiment also includes a base plate fixedly connected to the top of the liquid outlet pipe, the upper surface of the base plate is fixedly connected to a first motor, the output end of the first motor is fixedly connected to a rotating plate, the upper surface of the rotating plate is provided with a first hydraulic cylinder, the output end of the first hydraulic cylinder is rotatably connected to a rotating column, the bottom end of the rotating column is fixedly connected to an insert block, the lower surface of the insert block is provided with a slot, the top end of the connecting shaft is fixedly connected to a protrusion, the lower surface of the rotating plate is fixedly connected to a second motor, the output end of the second motor is transmission-connected to a transmission belt, and the transmission belt is transmission-connected to the rotating column.

[0028] Specifically, when the liquid outlet pipe is scraped, the first motor is started first. The rotation of the first motor drives the rotating plate to rotate to the top of the liquid outlet pipe. At this time, the first hydraulic cylinder is started again. The first hydraulic cylinder drives the plug-in block at its output end to move downward, so that the slot provided on the lower surface of the plug-in block is plugged into the protrusion. After the plug-in block and the protrusion are plugged into each other, the second motor is started. The start of the second motor drives the transmission belt to perform transmission work. The transmission belt then drives the rotating column connected to the output end of the first hydraulic cylinder. The rotation of the rotating column drives the plug-in block to rotate, and then drives the protrusion plugged into the plug-in block. The rotation of the protrusion then drives the connecting shaft fixed to its bottom end to rotate. The connecting shaft is a reciprocating screw, which drives the cleaning ring sliding on its circumferential surface to move up and down to perform scraping work. Through the coordinated work of the first motor, the first hydraulic cylinder and the second motor, the automatic scraping of corrosive substances on the inner wall of the liquid outlet pipe is realized, which improves the scraping efficiency and reduces the complexity of manual operation. The reciprocating screw serves as a connecting shaft to ensure the stable and continuous up and down movement of the cleaning ring on the inner wall of the liquid outlet pipe, thereby achieving comprehensive scraping of corrosive substances. In addition, the plug-in design of the plug and the protrusion ensures the stability and reliability of the scraping work, avoiding problems such as poor scraping effect or equipment damage caused by loose connections.

[0029] like Figure 3 As shown, the cross-sections of the slot and the protrusion in this embodiment are both in a straight line shape, thereby being able to complete the plug-in operation and simultaneously drive the connecting shaft to drive the cleaning ring to perform the scraping operation.

[0030] Example 2: Figures 1 to 8 As shown, comparative example 1, wherein another embodiment of the present invention is: the sealing member includes a second hydraulic cylinder fixedly connected to the inner wall of the box body, the output end of the second hydraulic cylinder is fixedly connected to a fixed column, the top of the fixed column is fixedly connected to a connecting ring, the connecting ring is used to seal the liquid outlet pipe, a plurality of spray holes are opened inside the connecting ring, a water inlet pipe is provided inside the box body, a multi-section telescopic pipe is fixedly connected to one side of the water inlet pipe, the multi-section telescopic pipe is fixedly connected to the connecting ring, the water inlet pipe is used to pass a cleaning agent to assist in cleaning the corrosive substances on the inner wall of the liquid outlet pipe, a spiral rod is fixedly connected to the bottom surface of the liquid outlet pipe, the bottom end of the spiral rod is inserted into the positioning hole opened on the surface of the fixed column, the surface of the spiral rod is rotatably connected to a sealing disk, and the sealing disk is used to seal the spray hole.

[0031] Specifically, before scraping and cleaning the liquid outlet pipe, the second hydraulic cylinder is first started to push the connecting ring on the upper surface of the fixed column to seal the bottom end of the liquid outlet pipe. During the sealing process, the connecting ring can push the sealing disk to move upward along the spiral rod, and the spiral rod is passively inserted into the positioning hole while its position remains unchanged. The sealing disk rotates during the upward movement of the spiral rod. During the rotation, the sealing disk releases the seal on the spray hole. When the connecting ring is completely plugged into the liquid outlet pipe, the sealing disk is completely opened, thereby allowing the spray hole to spray the cleaning agent, and the auxiliary cleaning ring scrapes the inner wall of the liquid outlet pipe. Before scraping and cleaning the inner wall of the liquid outlet pipe, the second hydraulic cylinder pushes the connecting ring to seal the bottom end of the liquid outlet pipe, ensuring the smooth progress of the cleaning work and avoiding leakage of the cleaning agent. At the same time, the connecting ring pushes the sealing disk to rise along the spiral rod and rotate to open the spray hole, cleverly realizing the timed and quantitative spraying of the cleaning agent, which not only saves the use of cleaning agent, but also enhances the cleaning effect, improves the degree of automation of the cleaning work, and reduces the difficulty and cost of manual operation.

[0032] A method for using a natural gas liquefied thermal insulation storage device, comprising the following steps: Step 1: Filling with liquefied natural gas: First, connect the external liquefied natural gas tank to the annular groove 212 of the liquid storage box 1 through the feed pipe, open the liquid inlet 11, and inject liquefied natural gas into the liquid storage box 1. After the injection is completed, close the sealing valve and disconnect the connecting pipeline; Step 2: Operation and insulation: Start the water pump in the cooling tank and send the coolant into the interlayer of the liquid storage tank 1 through the water inlet pipe 37. After heat exchange, the coolant returns to the cooling tank through the water outlet pipe to achieve circulation and insulation.

[0033] Step 3: End of transportation and discharge: After the transportation is completed, the liquefied natural gas is discharged into the external natural gas tank through the liquid outlet pipe 12, the sealing valve and the water pump are closed, and the pipeline connection is disconnected.

[0034] Preferably, step 2 of ending transportation and discharge is specifically that after the transportation and discharge are completed, when cleaning the storage box 1, the connecting ring 32 of the seal is first started to seal the bottom end of the liquid outlet rod, and then the scraping component is started to clean the inner wall of the liquid outlet pipe 12.

[0035] Working principle: First, liquefied natural gas is injected into the tank through the liquid inlet for storage. When liquefied natural gas needs to be taken out, the liquefied gas will flow out through the liquid outlet pipe, and the scraping component set inside the liquid outlet pipe plays a key role. The connecting shaft drives the cleaning ring to slide back and forth on the inner wall of the liquid outlet pipe. This reciprocating motion ensures that the cleaning ring can fully and effectively scrape off the corrosive substances on the inner wall of the liquid outlet pipe, preventing the corrosive substances from further eroding the inner wall of the liquid outlet pipe, ensuring the unobstructed flow of the liquid outlet pipe. At the same time, the seal on the inner wall of the tank ensures the bottom of the liquid outlet pipe is clean. Sealing: The plug-in design of the connecting ring and the bottom end of the liquid outlet pipe makes the sealing effect more reliable, avoids the leakage of liquefied natural gas, and improves the safety of storage. The design of the scraper component effectively solves the problem of corrosion accumulation on the inner wall of the liquid outlet pipe, extends the service life of the liquid outlet pipe, and reduces maintenance costs. At the same time, the setting of the seal enhances the sealing performance of the bottom end of the liquid outlet pipe, ensures the safe storage of liquefied natural gas, and avoids safety hazards caused by leakage. In addition, the device has a simple structure, is easy to operate, and is easy to maintain and service. When the liquid outlet pipe is scraped, the first motor is started first. The rotation of the first motor drives the rotating plate to rotate to the top of the liquid outlet pipe. At this time, the first hydraulic cylinder is started again. The first hydraulic cylinder drives the plug at its output end to move downward so that the slot provided on the lower surface of the plug is plugged into the protrusion. After the plug and the protrusion are plugged in, the second motor is started. The start of the second motor drives the transmission belt to perform transmission work. The transmission belt then drives the rotating column connected to the output end of the first hydraulic cylinder. The rotation of the rotating column drives the plug to rotate, and then drives the protrusion plugged in with the plug. The rotation of the protrusion then drives the connecting shaft fixed to its bottom end to rotate. The connecting shaft is a reciprocating screw, which drives the cleaning ring sliding on its circumferential surface to move up and down to perform scraping work. The coordinated operation of the first motor, the first hydraulic cylinder, and the second motor enables automated scraping of corrosive materials from the inner wall of the outlet pipe, improving scraping efficiency and reducing the complexity of manual operation. The reciprocating screw, serving as a connecting shaft, ensures stable and continuous up and down movement of the cleaning ring on the inner wall of the outlet pipe, thereby achieving comprehensive scraping of corrosive materials. Furthermore, the plug-in design of the plug and the protrusion ensures the stability and reliability of the scraping operation, avoiding problems such as poor scraping results or equipment damage caused by loose connections. In addition, before scraping and cleaning the liquid outlet pipe, first start the second hydraulic cylinder to push the connecting ring on the upper surface of the fixed column to seal the bottom end of the liquid outlet pipe. During the sealing process, the connecting ring can push the sealing disk to move upward along the spiral rod, and the spiral rod is passively inserted into the positioning hole while its position remains unchanged. The sealing disk rotates during the upward movement of the spiral rod. During the rotation, the sealing disk releases the seal on the spray hole. When the connecting ring is completely connected to the liquid outlet pipe, the sealing disk is completely opened, thereby allowing the spray hole to spray out the cleaning agent, and the auxiliary cleaning ring scrapes the inner wall of the liquid outlet pipe. The second hydraulic cylinder pushes the connecting ring to seal the bottom end of the liquid outlet pipe, ensuring the smooth progress of the cleaning work and avoiding leakage of the cleaning agent. At the same time, the connecting ring pushes the sealing disk to rise along the spiral rod and rotate to open the spray hole, cleverly realizing the timed and quantitative spraying of the cleaning agent, which not only saves the use of cleaning agent, but also enhances the cleaning effect, improves the degree of automation of the cleaning work, and reduces the difficulty and cost of manual operation.

[0036] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A natural gas liquefied heat preservation storage device, comprising a box body (1), wherein a liquid inlet (11) is fixedly connected to the upper surface of the box body (1), and a liquid outlet pipe (12) is provided on one side of the liquid inlet (11), characterized in that: A scraping assembly is provided inside the liquid outlet pipe (12), and the scraping assembly is used to scrape off corrosion products on the inner wall of the liquid outlet pipe (12). The scraping assembly includes a connecting shaft (210) rotatably provided on the bottom wall of the liquid outlet pipe (12), and a cleaning ring (211) is provided on the circumferential surface of the connecting shaft (210) so as to slide back and forth. The circumferential surface of the cleaning ring (211) abuts against the inner wall of the liquid outlet pipe (12), thereby scraping off the inner wall of the liquid outlet pipe (12); The inner wall of the box body (1) is provided with a sealing member, which is used to seal the bottom wall of the liquid outlet pipe (12). The sealing member includes a connecting ring (32) slidably arranged inside the box body (1), and the connecting ring (32) can be plugged into the bottom end of the liquid outlet pipe (12); Complete the sealing work on the bottom end of the liquid outlet pipe (12).

2. A natural gas liquefied heat preservation storage device according to claim 1, characterized in that: The scraping assembly further comprises a bottom plate (2) fixedly connected to the top end of the liquid outlet pipe (12), a first motor (21) being fixedly connected to the upper surface of the bottom plate (2), an output end of the first motor (21) being fixedly connected to a rotating plate (22), a first hydraulic cylinder (25) being provided on the upper surface of the rotating plate (22), an output end of the first hydraulic cylinder (25) being rotatably connected to a rotating column (26), an insert (27) being fixedly connected to the bottom end of the rotating column (26), a slot (28) being provided on the lower surface of the insert (27), a protrusion (29) being fixedly connected to the top end of the connecting shaft (210), a second motor (23) being fixedly connected to the lower surface of the rotating plate (22), an output end of the second motor (23) being transmission-connected to a transmission belt (24), and the transmission belt (24) being transmission-connected to the rotating column (26).

3. The natural gas liquefied heat preservation storage device according to claim 2, characterized in that: When scraping the liquid outlet pipe (12), the first motor (21) is first started. The rotation of the first motor (21) drives the rotating plate (22) to rotate to the top of the liquid outlet pipe (12). At this time, the first hydraulic cylinder (25) is started again. The first hydraulic cylinder (25) drives the plug (27) at its output end to move downward, so that the slot (28) provided on the lower surface of the plug (27) is plugged into the protrusion (29). After the plug (27) and the protrusion (29) are plugged in, the second motor (23) is started. The second motor (23) The start-up drives the transmission belt (24) to perform transmission work, and the transmission belt (24) drives the rotation of the rotating column (26) connected to the output end of the first hydraulic cylinder (25). The rotation of the rotating column (26) drives the plug (27) to rotate, and then drives the protrusion (29) connected to the plug (27). The rotation of the protrusion (29) drives the connecting shaft (210) fixed to its bottom end to rotate. The connecting shaft (210) is a reciprocating screw, which drives the cleaning ring (211) slidingly arranged on its circumferential surface to move up and down to perform scraping work.

4. A natural gas liquefied heat preservation storage device according to claim 3, characterized in that: The cross-sections of the slot (28) and the protrusion (29) are both in a straight line shape, thereby enabling the plugging operation to be completed while driving the connecting shaft (210) to drive the cleaning ring (211) to perform the scraping operation.

5. The natural gas liquefied heat preservation storage device according to claim 1, characterized in that: The sealing member comprises a second hydraulic cylinder (3) fixedly connected to the inner wall of the box body (1); the output end of the second hydraulic cylinder (3) is fixedly connected to a fixing column (31); the top end of the fixing column (31) is fixedly connected to a connecting ring (32); the connecting ring (32) is used to seal the liquid outlet pipe (12).

6. The natural gas liquefied heat preservation storage device according to claim 5, characterized in that: A plurality of spray holes (36) are provided inside the connecting ring (32), and a water inlet pipe (37) is provided inside the box (1). One side of the water inlet pipe (37) is fixedly connected to a multi-section telescopic pipe (38), and the multi-section telescopic pipe (38) is fixedly connected to the connecting ring (32). The water inlet pipe (37) is used to introduce a cleaning agent to assist in cleaning the corrosive substances on the inner wall of the liquid outlet pipe (12).

7. The natural gas liquefied heat preservation storage device according to claim 1, characterized in that: A spiral rod (33) is fixedly connected to the bottom surface of the liquid outlet pipe (12), and the bottom end of the spiral rod (33) is inserted into a positioning hole (35) provided on the surface of the fixing column (31). A sealing disk (34) is rotatably connected to the surface of the spiral rod (33), and the sealing disk (34) is used to seal the spray hole (36).

8. The natural gas liquefied heat preservation storage device according to claim 7, characterized in that: Before scraping and cleaning the liquid outlet pipe (12), the second hydraulic cylinder (3) is first started to push the connecting ring (32) on the upper surface of the fixed column (31) to seal the bottom end of the liquid outlet pipe (12). During the sealing process, the connecting ring (32) can push the sealing disk (34) to move upward along the spiral rod (33), and the spiral rod (33) is passively inserted into the positioning hole (35) while the position of the spiral rod (33) remains unchanged. The sealing disk (34) rotates during the process of moving upward along the spiral rod (33). During the rotation process, the sealing disk (34) releases the seal on the spray hole (36). When the connecting ring (32) is completely connected to the liquid outlet pipe (12), the sealing disk (34) is completely opened, thereby allowing the spray hole (36) to spray the cleaning agent, and the auxiliary cleaning ring (211) scrapes the inner wall of the liquid outlet pipe (12).

9. A method for using a natural gas liquefied heat preservation storage device, applied to a natural gas liquefied heat preservation storage device according to any one of claims 1 to 9, characterized in that: The specific steps include: Step 1: Filling with liquefied natural gas: First, connect the external liquefied natural gas tank to the annular groove (212) of the liquid storage box (1) through the feed pipe, open the liquid inlet (11), and inject liquefied natural gas into the liquid storage box (1). After the injection is completed, close the sealing valve and disconnect the connecting pipeline; Step 2: Operation and insulation: Start the water pump in the cooling tank and send the coolant into the interlayer of the liquid storage box (1) through the water inlet pipe (37). After heat exchange, the coolant returns to the cooling tank through the water outlet pipe to achieve circulation and insulation. Step 3: End of transportation and discharge: After the transportation is completed, the liquefied natural gas is discharged into the external natural gas tank through the liquid outlet pipe (12), the sealing valve and the water pump are closed, and the pipeline connection is disconnected.

10. The method for using the natural gas liquefied heat preservation storage device according to claim 9, characterized in that: The step 2 of ending the transport and discharge is specifically as follows: after the transport and discharge are completed, when cleaning the storage box (1), the connecting ring (32) of the sealing member is first activated to seal the bottom end of the liquid outlet rod, and then the scraping assembly is activated to clean the inner wall of the liquid outlet pipe (12).

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