A natural gas liquefaction heat preservation storage device and a use method thereof

Abstract

The application belongs to the technical field of natural gas liquefaction heat preservation and storage, in particular to a natural gas liquefaction heat preservation and storage device and a use method, which comprises a box body, the upper surface of the box body is fixedly connected with a liquid inlet, one side of the liquid inlet is provided with a liquid outlet pipe, the inside of the liquid outlet pipe is provided with a scraping assembly, the scraping assembly is used for scraping the corrosion of the inner wall of the liquid outlet pipe, the scraping assembly comprises a connecting shaft which is rotationally arranged on the bottom wall of the liquid outlet pipe, a cleaning ring is reciprocally and slidably arranged on the circumferential surface of the connecting shaft, the circumferential surface of the cleaning ring is in abutment with 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 element, the sealing element is used for sealing the bottom wall of the liquid outlet pipe, the sealing element comprises a connecting ring which is slidably arranged in the box body, the bottom end of the liquid outlet pipe can be inserted into the connecting ring, by arranging the scraping assembly, the problem that a large amount of corrosion is attached to the inside of the pipeline in the storage box body after long-term use is solved.

Description

TECHNICAL FIELD

[0001] The application 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 use method. BACKGROUND

[0002] Liquefied natural gas (LNG) is prone to rapid vaporization at room temperature and normal pressure, so it needs to be stored in a low-temperature and normal-pressure condition. To ensure its stability and reduce evaporation loss, heat preservation storage is crucial. At the same time, this measure can effectively prevent potential safety risks and ensure the safe storage of liquefied natural gas.

[0003] The specific process of the existing natural gas liquefaction and heat preservation storage is as follows: first, the extracted natural gas needs to be pretreated to remove impurities in the natural gas. The pretreated natural gas is pressurized by a compressor and enters a cooling system. The natural gas is gradually cooled to near its liquefaction point by using multi-stage cooling technology. In each stage of cooling, a part of the natural gas begins to liquefy, and the remaining unliquefied gas continues to enter the next stage of cooling to absorb and carry away the heat of the natural gas. When the natural gas is cooled to a sufficiently low temperature, it will eventually completely liquefy. At this time, the liquefied natural gas (LNG) will be sent to a dedicated heat preservation storage tank for storage. These storage tanks are usually composed of double walls, with heat insulation materials such as perlite or polyurethane foam filled in the middle.

[0004] However, the existing natural gas liquefaction and heat preservation storage device has the problem that, because the natural gas storage tank is used for a long time and has a sandwich structure, it is not often disassembled for maintenance. This leads to corrosion and damage of the inner wall of the outflow pipe after a long period of use, resulting in the mixing of pipe corrosion products or external pollutants during the transportation of natural gas, which reduces the purity of liquefied natural gas and may accelerate the corrosion of the pipe.

[0005] Therefore, the application provides a natural gas liquefaction and heat preservation storage device and a use method. SUMMARY

[0006] In order to make up for the deficiencies of the prior art and solve at least one technical problem raised in the background.

[0007] The technical scheme adopted by the application to solve the technical problems is that the natural gas liquefaction and heat preservation storage device and the use method comprise a tank body, the upper surface of the tank body is fixedly connected with an inflow port, one side of the inflow port is provided with an outflow pipe, the inside of the outflow pipe is provided with a scraping assembly, the scraping assembly is used for scraping the corrosion products on the inner wall of the outflow pipe, the scraping assembly comprises a connecting shaft rotatably arranged on the bottom wall of the outflow pipe, a cleaning ring is reciprocally and slidably arranged on the circumferential surface of the connecting shaft, the circumferential surface of the cleaning ring abuts against the inner wall of the outflow pipe, and the inner wall of the outflow pipe is scraped.

[0008] The inner wall of the box is provided with a sealing element for sealing the bottom wall of the liquid outlet pipe, the sealing element comprising a connecting ring slidingly arranged in the interior of the box, the connecting ring being capable of being inserted with the bottom end of the liquid outlet pipe;

[0009] The sealing work on the bottom end of the liquid outlet pipe is completed.

[0010] Preferably, the scraping assembly further comprises a bottom plate fixed to the top end of the liquid outlet pipe, the upper surface of the bottom plate being fixed with a first motor, the output end of the first motor being fixed with a rotating plate, the upper surface of the rotating plate being provided with a first hydraulic cylinder, the output end of the first hydraulic cylinder being rotatably connected with a rotating column, the bottom end of the rotating column being fixed with a plug, the lower surface of the plug being provided with a slot, the top end of the connecting shaft being fixed with a protrusion, the lower surface of the rotating plate being fixed with a second motor, the output end of the second motor being drivingly connected with a transmission belt, the transmission belt being drivingly connected with the rotating column.

[0011] Preferably, when the liquid outlet pipe is scraped, the first motor is first started, 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, the first hydraulic cylinder drives the plug at the output end thereof to move downward, so that the slot provided on the lower surface of the plug is inserted with the protrusion, after the plug and the protrusion are inserted, the second motor is started, the start of the second motor drives the transmission belt to drive the rotating column rotatably connected with the output end of the first hydraulic cylinder, the rotation of the rotating column drives the plug to rotate, in turn driving the protrusion inserted with the plug, the rotation of the protrusion drives the connecting shaft fixed to the bottom end thereof to rotate, the connecting shaft is a reciprocating screw, in turn driving the cleaning ring slidingly arranged on the circumferential surface thereof to move up and down for scraping work.

[0012] Preferably, the cross section of the slot and the cross section of the protrusion are both in the shape of a straight line, in turn capable of completing the insertion work and driving the cleaning ring to perform the scraping work.

[0013] Preferably, the sealing element comprises a second hydraulic cylinder fixed to the inner wall of the box, the output end of the second hydraulic cylinder being fixed with a fixing column, the top end of the fixing column being fixed with a connecting ring, the connecting ring being used for sealing the liquid outlet pipe.

[0014] Preferably, the interior of the connecting ring is provided with a plurality of spray holes, the interior of the box being provided with a water inlet pipe, one side of the water inlet pipe being fixed with a plurality of telescopic pipes, the plurality of telescopic pipes being fixed with the connecting ring, the water inlet pipe being used for introducing cleaning agent to assist in cleaning the corrosion on the inner wall of the liquid outlet pipe.

[0015] 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 disc is rotatably connected to the surface of the spiral rod, the sealing disc being used to seal the spray hole.

[0016] Preferably, before scraping and cleaning the outlet pipe, the second hydraulic cylinder is first activated to push the connecting ring on the upper surface of the fixed column to seal the bottom end of the outlet pipe. During the sealing process, the connecting ring can push the sealing disc to move upward along the spiral rod. With the spiral rod in an unchanged position, it is passively inserted into the positioning hole. The sealing disc rotates as it moves upward along the spiral rod. During the rotation, the sealing disc releases the seal on the spray hole. When the connecting ring is fully inserted into the outlet pipe, the sealing disc is fully opened, allowing the spray hole to spray out cleaning agent to assist the cleaning ring in scraping the inner wall of the outlet pipe.

[0017] A method for using a natural gas liquefaction and insulation storage device, comprising the following steps:

[0018] Step 1, Filling with liquefied natural gas: First, connect the external liquefied natural gas tank to the annular groove 212 of the storage tank 1 through the feed pipe, open the inlet 11, and inject liquefied natural gas into the storage tank 1. After the injection is completed, close the sealing valve and disconnect the connecting pipeline.

[0019] Step 2, Operation and Insulation: Start the water pump in the cooling tank to send the coolant into the jacket 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.

[0020] Step 3: End of Transportation and Discharge: After transportation is completed, liquefied natural gas is discharged into an external natural gas tank through the outlet pipe 12, the sealing valve and water pump are closed, and the pipeline connection is disconnected.

[0021] Preferably, step two, ending transportation and discharge, specifically involves cleaning the storage tank 1 after the transportation and discharge are completed. First, the connecting ring 32 of the sealing component is 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.

[0022] The beneficial effects of this invention are as follows:

[0023] 1. The natural gas liquefaction and insulation storage device and its usage method described in this invention involve injecting liquefied natural gas into a tank through an inlet for storage. When liquefied natural gas needs to be removed, it flows out through an outlet pipe. A scraping component inside the outlet pipe plays a crucial role; a connecting shaft drives a cleaning ring to slide back and forth on the inner wall of the outlet pipe. This reciprocating motion ensures that the cleaning ring can thoroughly and effectively scrape away corrosive substances from the inner wall of the outlet pipe, preventing further erosion and ensuring unobstructed flow. Simultaneously, the inner wall of the tank is sealed. The device ensures the sealing of the bottom of the outlet pipe. The plug-in design of the connecting ring and the bottom of the 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 scraping component effectively solves the problem of corrosion accumulation on the inner wall of the outlet pipe, extends the service life of the outlet pipe, and reduces maintenance costs. At the same time, the sealing component enhances the sealing performance of the bottom of the outlet pipe, ensuring the safe storage of liquefied natural gas and avoiding safety hazards caused by leakage. In addition, the device has a simple structure, is easy to operate, and is easy to maintain and service.

[0024] 2. The natural gas liquefaction and heat preservation storage device and its usage method described in this invention achieve automated scraping of corrosion on the inner wall of the outlet pipe through the coordinated work of the first motor, the first hydraulic cylinder, and the second motor. This improves scraping efficiency and reduces the complexity of manual operation. The reciprocating screw, as a connecting shaft, ensures the stable and continuous up-and-down movement of the cleaning ring on the inner wall of the outlet pipe, thereby achieving comprehensive scraping of corrosion. In addition, the insertion design of the insert 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 connection.

[0025] 3. The natural gas liquefaction insulation storage device and its usage method described in this invention, by using a second hydraulic cylinder to push a connecting ring to seal the bottom end of the outlet pipe before scraping and cleaning the inner wall of the outlet pipe, ensures the smooth progress of the cleaning work and avoids leakage of the cleaning agent. At the same time, the design of the connecting ring pushing the sealing disc to rise along the spiral rod and rotate to open the spray hole cleverly realizes the timed and quantitative spraying of the cleaning agent, which not only saves the amount of cleaning agent used, but also enhances the cleaning effect, improves the automation level of the cleaning work, and reduces the difficulty and cost of manual operation. Attached Figure Description

[0026] The invention will now be further described with reference to the accompanying drawings.

[0027] Figure 1 This is a perspective view of Embodiment 1 of the present invention;

[0028] Figure 2 This is a schematic diagram of the main structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of the base plate of the present invention;

[0030] Figure 4 This is a cross-sectional view of the housing of the present invention;

[0031] Figure 5 This is a schematic diagram of the annular groove of the present invention;

[0032] Figure 6 This is a schematic diagram of the liquid outlet pipe of the present invention;

[0033] Figure 7 This is a schematic diagram of the connecting shaft of the present invention;

[0034] Figure 8 This is a schematic diagram of the connecting ring of the present invention.

[0035] In the diagram: 1. Box body; 11. Liquid inlet; 12. Liquid outlet pipe;

[0036] 2. Base plate; 21. First motor; 22. Rotating plate; 23. Second motor; 24. Transmission belt; 25. First hydraulic cylinder; 26. Rotating column; 27. Insert block; 28. Slot; 29. ​​Protrusion; 210. Connecting shaft; 211. Cleaning ring; 212. Annular groove;

[0037] 3. Second hydraulic cylinder; 31. Fixed column; 32. Connecting ring; 33. Helical rod; 34. Sealing disc; 35. Positioning hole; 36. Spray hole; 37. Water inlet pipe; 38. Multi-section telescopic pipe. Detailed Implementation

[0038] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0039] Example 1: As Figures 1 to 8 As shown in the embodiment of the present invention, a natural gas liquefaction and heat preservation storage device and its usage method include a box body. An inlet is fixedly connected to the upper surface of the box body. An outlet pipe is provided on one side of the inlet. A scraping assembly is provided inside the outlet pipe. The scraping assembly is used to scrape off corrosion on the inner wall of the outlet pipe. The scraping assembly includes a connecting shaft rotatably mounted on the bottom wall of the outlet pipe. A cleaning ring is reciprocally slidably mounted on the circumferential surface of the connecting shaft. The circumferential surface of the cleaning ring abuts against the inner wall of the outlet pipe, thereby scraping off the inner wall of the outlet pipe. A sealing element is provided on the inner wall of the box body. The sealing element is used to seal the bottom wall of the outlet pipe. The sealing element includes a connecting ring slidably mounted inside the box body. The connecting ring can be inserted into the bottom end of the outlet pipe, thus completing the sealing of the bottom end of the outlet pipe.

[0040] Specifically, in the use of existing liquefied natural gas storage devices, because the natural gas storage tank is used for a long time and has a double layer, it is not often disassembled for maintenance. This leads to corrosion and damage to the inner wall of the internal outlet pipe after long-term use. This results in the mixing of pipeline corrosion products or external contaminants during natural gas transportation, which reduces the purity of liquefied natural gas and may also accelerate pipeline corrosion.

[0041] Therefore, this invention addresses the aforementioned problems by providing a corresponding structure. First, liquefied natural gas (LNG) is injected into the tank through the inlet for storage. When LNG needs to be removed, it flows out through the outlet pipe. The scraping component inside the outlet pipe plays a crucial role. The connecting shaft drives a cleaning ring to slide back and forth on the inner wall of the outlet pipe. This reciprocating motion ensures that the cleaning ring can thoroughly and effectively scrape away corrosion from the inner wall of the outlet pipe, preventing further erosion and ensuring unobstructed flow. Simultaneously, the airtightness of the inner wall of the tank... The sealing element ensures the sealing of the bottom of the outlet pipe. The plug-in design of the connecting ring and the bottom of the 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 corrosion accumulation on the inner wall of the outlet pipe through the design of the scraping component, extends the service life of the outlet pipe, and reduces maintenance costs. At the same time, the sealing element enhances the sealing performance of the bottom of the outlet pipe, ensuring the safe storage of liquefied natural gas and avoiding safety hazards caused by leakage. In addition, the device has a simple structure, is easy to operate, and is easy to maintain and service.

[0042] This solves the problem of a large amount of corrosion adhering to the inside of the pipes in the storage box after long-term use.

[0043] like Figure 3 As shown, the scraping assembly in this embodiment also includes a base plate fixed to the top of the liquid outlet pipe. A first motor is fixed to the upper surface of the base plate, and a rotating plate is fixed to the output end of the first motor. A first hydraulic cylinder is provided on the upper surface of the rotating plate, and a rotating column is rotatably connected to the output end of the first hydraulic cylinder. An insert is fixed to the bottom end of the rotating column, and a slot is provided on the lower surface of the insert. A protrusion is fixed to the top of the connecting shaft. A second motor is fixed to the lower surface of the rotating plate, and a transmission belt is driven to the output end of the second motor. The transmission belt is driven to the rotating column.

[0044] Specifically, when scraping the liquid outlet pipe, the first motor is started first. The rotation of the first motor drives the rotating plate to rotate directly above the liquid outlet pipe. At this time, the first hydraulic cylinder is started. The first hydraulic cylinder drives the insert block at its output end to move downward, so that the slot opened on the lower surface of the insert block is inserted into the protrusion. After the insert block and the protrusion are inserted, 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 rotatably connected to the output end of the first hydraulic cylinder. The rotation of the rotating column drives the insert block to rotate, which in turn drives the protrusion that is inserted with the insert 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 in turn drives the cleaning ring slidably set on its circumferential surface to move up and down to perform scraping work.

[0045] Through the coordinated operation of the first motor, the first hydraulic cylinder, and the second motor, the corrosion on the inner wall of the outlet pipe is automatically scraped off, improving scraping efficiency and reducing the complexity of manual operation. The reciprocating screw, as the connecting shaft, ensures the stable and continuous up-and-down movement of the cleaning ring on the inner wall of the outlet pipe, thereby achieving comprehensive scraping of the corrosion. In addition, the insertion design of the insert 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 connection.

[0046] like Figure 3 As shown, in this embodiment, both the cross-section of the slot and the cross-section of the protrusion are in the shape of a straight line, which enables the insertion work to be completed, while driving the connecting shaft to drive the cleaning ring to perform scraping work.

[0047] Example 2: Figures 1 to 8 As shown in the comparative embodiment one, another embodiment of the present invention is as follows: the sealing element includes a second hydraulic cylinder fixed to the inner wall of the box, a fixed column fixed to the output end of the second hydraulic cylinder, a connecting ring fixed to the top of the fixed column, the connecting ring being used to seal the liquid outlet pipe, a plurality of spray holes being opened inside the connecting ring, a water inlet pipe being provided inside the box, a plurality of telescopic pipes being fixed to one side of the water inlet pipe, the plurality of telescopic pipes being fixed to the connecting ring, the water inlet pipe being used to introduce cleaning agent to assist in cleaning the corrosion on the inner wall of the liquid outlet pipe, a spiral rod being fixed to the bottom surface of the liquid outlet pipe, the bottom end of the spiral rod being inserted into a positioning hole opened on the surface of the fixed column, a sealing disc being rotatably connected to the surface of the spiral rod, the sealing disc being used to seal the spray holes.

[0048] Specifically, before scraping and cleaning the outlet pipe, the second hydraulic cylinder is first activated to push the connecting ring on the upper surface of the fixed column to seal the bottom end of the outlet pipe. During the sealing process, the connecting ring can push the sealing disc to move upward along the spiral rod. With the spiral rod in an unchanged position, it is passively inserted into the positioning hole. The sealing disc rotates as it moves upward along the spiral rod. During the rotation, the sealing disc releases the seal on the spray hole. When the connecting ring is fully inserted into the outlet pipe, the sealing disc is fully opened, allowing the spray hole to spray out cleaning agent to assist the cleaning ring in scraping the inner wall of the outlet pipe.

[0049] Before scraping and cleaning the inner wall of the outlet pipe, the second hydraulic cylinder pushes the connecting ring to seal the bottom of the outlet pipe, ensuring the smooth progress of the cleaning work and preventing the leakage of cleaning agent. At the same time, the design of the connecting ring pushing the sealing disc to rise along the spiral rod and rotate to open the spray hole cleverly realizes the timed and quantitative spraying of cleaning agent, which not only saves the amount of cleaning agent used, but also enhances the cleaning effect, improves the automation level of the cleaning work, and reduces the difficulty and cost of manual operation.

[0050] A method for using a natural gas liquefaction and insulation storage device, comprising the following steps:

[0051] Step 1, Filling with liquefied natural gas: First, connect the external liquefied natural gas tank to the annular groove 212 of the storage tank 1 through the feed pipe, open the inlet 11, and inject liquefied natural gas into the storage tank 1. After the injection is completed, close the sealing valve and disconnect the connecting pipeline.

[0052] Step 2, Operation and Insulation: Start the water pump in the cooling tank to send the coolant into the jacket 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.

[0053] Step 3: End of Transportation and Discharge: After transportation is completed, liquefied natural gas is discharged into an external natural gas tank through the outlet pipe 12, the sealing valve and water pump are closed, and the pipeline connection is disconnected.

[0054] Preferably, step two, ending transportation and discharge, specifically involves cleaning the storage tank 1 after the transportation and discharge are completed. First, the connecting ring 32 of the sealing component is 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.

[0055] The working principle is as follows: First, liquefied natural gas (LNG) is injected into the tank through the inlet for storage. When LNG needs to be removed, it flows out through the outlet pipe. The scraping component inside the outlet pipe plays a crucial role. A connecting shaft drives a cleaning ring to slide back and forth on the inner wall of the outlet pipe. This reciprocating motion ensures that the cleaning ring can thoroughly and effectively scrape away corrosive substances from the inner wall of the outlet pipe, preventing further erosion and ensuring unobstructed flow. Simultaneously, the sealing components on the inner wall of the tank ensure the bottom of the outlet pipe... The sealing performance, with its plug-in design between the connecting ring and the bottom of the outlet pipe, ensures a more reliable seal, preventing liquefied natural gas leaks and improving storage safety. The scraping component effectively addresses the issue of corrosion buildup on the inner wall of the outlet pipe, extending its service life and reducing maintenance costs. Furthermore, the sealing elements enhance the sealing performance at the bottom of the outlet pipe, ensuring safe storage of liquefied natural gas and preventing safety hazards caused by leaks. In addition, the device is simple in structure, easy to operate, and convenient to maintain and service.

[0056] When scraping the liquid outlet pipe, the first motor is started first. The rotation of the first motor drives the rotating plate to rotate directly above the liquid outlet pipe. At this time, the first hydraulic cylinder is started. The first hydraulic cylinder drives the insert block at its output end to move downward, so that the slot opened on the lower surface of the insert block is inserted into the protrusion. After the insert block and the protrusion are inserted, 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 rotatably connected to the output end of the first hydraulic cylinder. The rotation of the rotating column drives the insert block to rotate, which in turn drives the protrusion that is inserted with the insert 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 in turn drives the cleaning ring slidably set on its circumferential surface to move up and down to perform scraping work.

[0057] Through the coordinated operation of the first motor, the first hydraulic cylinder, and the second motor, the automatic scraping of corrosion on the inner wall of the outlet pipe is achieved, which improves the scraping efficiency and reduces the complexity of manual operation. The reciprocating screw, as the connecting shaft, ensures the stable and continuous up-and-down movement of the cleaning ring on the inner wall of the outlet pipe, thereby achieving comprehensive scraping of corrosion. In addition, the insertion design of the insert and the protrusion ensures the stability and reliability of the scraping work and avoids problems such as poor scraping effect or equipment damage caused by loose connection.

[0058] Before scraping and cleaning the outlet pipe, the second hydraulic cylinder is activated to push the connecting ring on the upper surface of the fixed column to seal the bottom of the outlet pipe. During the sealing process, the connecting ring can push the sealing disc to move upward along the spiral rod. With the spiral rod in an unchanged position, it is passively inserted into the positioning hole. The sealing disc rotates as it moves upward along the spiral rod. During the rotation, the sealing disc releases the seal on the spray hole. When the connecting ring is fully inserted into the outlet pipe, the sealing disc is fully opened, allowing the spray hole to spray out cleaning agent to assist the cleaning ring in scraping the inner wall of the outlet pipe.

[0059] The second hydraulic cylinder pushes the connecting ring to seal the bottom of the outlet pipe, ensuring the smooth progress of the cleaning work and preventing the leakage of cleaning agent. At the same time, the design of the connecting ring pushing the sealing disc to rise along the spiral rod and rotate to open the spray hole cleverly realizes the timed and quantitative spraying of cleaning agent, which not only saves the amount of cleaning agent used, but also enhances the cleaning effect, improves the automation level of the cleaning work, and reduces the difficulty and cost of manual operation.

[0060] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A natural gas liquefaction and heat preservation storage device, comprising a housing (1), wherein an inlet (11) is fixedly connected to the upper surface of the housing (1), and an outlet pipe (12) is provided on one side of the inlet (11), characterized in that: The inside of the outlet pipe (12) is provided with a scraping component. The scraping component is used to scrape off the corrosion on the inner wall of the outlet pipe (12). The scraping component includes a connecting shaft (210) rotatably disposed on the bottom wall of the outlet pipe (12). A cleaning ring (211) is reciprocally slidably disposed on the circumferential surface of the connecting shaft (210). The circumferential surface of the cleaning ring (211) abuts against the inner wall of the outlet pipe (12), thereby scraping off the inner wall of the outlet pipe (12). The inner wall of the box (1) is provided with a sealing element, which includes a second hydraulic cylinder (3) fixedly connected to the inner wall of the box (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 slidably disposed inside the box (1). The connecting ring (32) can be inserted into the bottom end of the liquid outlet pipe (12). The connecting ring (32) is used to seal the bottom end of the liquid outlet pipe (12). The scraping assembly also includes a base plate (2) fixed to the top of the liquid outlet pipe (12). A first motor (21) is fixed to the upper surface of the base plate (2). A rotating plate (22) is fixed to the output end of the first motor (21). A first hydraulic cylinder (25) is provided on the upper surface of the rotating plate (22). A rotating column (26) is rotatably connected to the output end of the first hydraulic cylinder (25). A plug (27) is fixed to the bottom end of the rotating column (26). A slot (28) is opened on the lower surface of the plug (27). A protrusion (29) is fixed to the top end of the connecting shaft (210). A second motor (23) is fixed to the lower surface of the rotating plate (22). A transmission belt (24) is driven to the output end of the second motor (23). The transmission belt (24) is driven to the rotating column (26). The connecting ring (32) has several spray holes (36) inside. The box (1) is provided with a water inlet pipe (37). A multi-section telescopic pipe (38) is fixedly connected to one side of the water inlet pipe (37). The multi-section telescopic pipe (38) is fixedly connected to the connecting ring (32). The water inlet pipe (37) is used to pass in cleaning agent to assist in cleaning the corrosion on the inner wall of the liquid outlet pipe (12).

2. The natural gas liquefaction and heat preservation storage device according to claim 1, characterized in that: When scraping the outlet pipe (12), the first motor (21) is started first. The rotation of the first motor (21) drives the rotating plate (22) to rotate directly above the outlet pipe (12). At this time, the first hydraulic cylinder (25) is started. The first hydraulic cylinder (25) drives the plug (27) at its output end to move downward, so that the slot (28) opened on the lower surface of the plug (27) is inserted into the protrusion (29). After the plug (27) and the protrusion (29) have completed the insertion work, the second motor (23) is started. The start-up drives the transmission belt (24) to perform transmission work. The transmission belt (24) then drives the rotating column (26) which is rotatably connected to the output end of the first hydraulic cylinder (25). The rotation of the rotating column (26) drives the insert block (27) to rotate, which in turn drives the protrusion (29) that is inserted with the insert block (27). The rotation of the protrusion (29) then drives the connecting shaft (210) fixed at its bottom end to rotate. The connecting shaft (210) is a reciprocating screw, which in turn drives the cleaning ring (211) that is slidably set on its circumferential surface to perform scraping work by moving up and down.

3. The natural gas liquefaction and heat preservation storage device according to claim 2, characterized in that: The cross-section of the slot (28) and the cross-section of the protrusion (29) are both in the shape of a straight line, which enables the insertion work to be completed, while driving the connecting shaft (210) to drive the cleaning ring (211) to perform scraping work.

4. A natural gas liquefaction and heat preservation storage device according to claim 1, characterized in that: The bottom surface of the liquid outlet pipe (12) is fixed with a spiral rod (33). The bottom end of the spiral rod (33) is inserted into the positioning hole (35) opened on the surface of the fixed column (31). The surface of the spiral rod (33) is rotatably connected with a sealing disc (34), which is used to seal the spray hole (36).

5. A natural gas liquefaction and heat preservation storage device according to claim 4, characterized in that: Before scraping and cleaning the outlet pipe (12), the second hydraulic cylinder (3) is activated to push the connecting ring (32) on the upper surface of the fixed column (31) to seal the bottom end of the outlet pipe (12). During the sealing process, the connecting ring (32) can push the sealing disc (34) to move upward along the spiral rod (33). While the position of the spiral rod (33) remains unchanged, it is passively inserted into the positioning hole (35). The sealing disc (34) rotates as it moves upward along the spiral rod (33). During the rotation, the sealing disc (34) releases the seal on the spray hole (36). When the connecting ring (32) is fully inserted into the outlet pipe (12), the sealing disc (34) is fully opened, allowing the spray hole (36) to spray out cleaning agent, which assists the cleaning ring (211) in scraping the inner wall of the outlet pipe (12).

Images