A safety device for liquid nitrogen LNG two-phase precooling

Abstract

This utility model relates to the field of precooling technology and discloses a liquid nitrogen LNG two-phase precooling safety device, including two stainless steel base frames. A storage tank is mounted on the top of each of the two stainless steel base frames. A cooling mechanism is located on the left side of the storage tank for precooling the tank body. A pressure relief mechanism is located on the right side of the storage tank for depressurizing the tank body. An explosion-proof mechanism is located on the right side of the interior of the storage tank. An insulating support mechanism is located on the top of each of the two stainless steel base frames. The cooling mechanism includes a sealing cover, the right side of which is located on the left side of the storage tank. In this utility model, the sealing cover integrates the LNG low-pressure export pipeline, the precooling pipeline, and the liquid nitrogen pipeline, allowing the introduction of LNG and liquid nitrogen to achieve simultaneous precooling of liquid nitrogen and LNG. This reduces the cost and loss of single-medium precooling, avoids the risk of localized overcooling, and improves the precooling efficiency and safety of the LNG storage tank.

Description

Technical Field

[0001] This utility model relates to the field of precooling technology, and in particular to a liquid nitrogen LNG two-phase precooling safety device. Background Technology

[0002] Pre-cooling is a pretreatment step before industrial equipment is put into formal use. It involves using a low-temperature medium to gradually reduce the equipment temperature to near the operating temperature. The purpose is to avoid excessive thermal stress caused by a sudden drop in temperature during formal operation, preventing equipment deformation, cracking, or seal failure. At the same time, it tests the stability and sealing performance of the equipment in low-temperature environments. The pre-cooling process requires strict control of the cooling rate to ensure that the equipment is safely adapted to subsequent low-temperature operating conditions. It is an important link to ensure the long-term reliable operation of the low-temperature system.

[0003] Precooling safety equipment optimizes cryogenic medium control and precisely manages the precooling process, preventing equipment brittleness caused by thermal stress due to sudden temperature changes, reducing energy waste, and improving precooling efficiency. At the same time, it monitors pressure and temperature parameters in real time, provides timely warnings of abnormalities, reduces the risk of leakage and explosion, ensures the safety of personnel and equipment, and lays the foundation for the stable operation of LNG cryogenic facilities.

[0004] In traditional precooling technology for extra-large LNG storage tanks, single-medium precooling has obvious shortcomings. When using only LNG for precooling, a large amount of LNG is required, resulting in high costs and significant material losses. While liquid nitrogen is inexpensive, it is difficult to precisely control the temperature drop rate, which can cause local overcooling, damage the storage tank, and limit the precooling efficiency, thus compromising the precooling efficiency and safety of LNG storage tanks. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a liquid nitrogen LNG two-phase precooling safety device, which aims to improve the obvious deficiencies of single-medium precooling in the existing technology. Using only a single cooling medium will limit the precooling efficiency, which is not conducive to the precooling efficiency and safety of LNG storage tanks.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a liquid nitrogen LNG two-phase precooling safety device, comprising two stainless steel base frames, the same storage tank being provided on the top of both stainless steel base frames, a cooling mechanism being provided on the left side of the storage tank for precooling the tank body, a pressure relief mechanism being provided on the right side of the storage tank for depressurizing the tank body, an explosion-proof mechanism being provided on the right side of the interior of the storage tank, and an insulating support mechanism being provided on the top of both stainless steel base frames;

[0007] The cooling mechanism includes a sealing cover, the right side of which is located on the left side of the storage tank. The upper left side and the front left side of the sealing cover are connected to LNG low-pressure export pipelines. Both of the two LNG low-pressure export pipelines have pipeline inlets on their left sides. Multiple flanges are fixedly connected to the outside of both LNG low-pressure export pipelines. The upper and lower right sides and the front and rear ends of the right side of the sealing cover are connected to a precooling pipeline and a liquid nitrogen pipeline, respectively. The bottom left end of the precooling pipeline and the front left end of the liquid nitrogen pipeline are respectively provided with flow-limiting covers. The top of both LNG low-pressure export pipelines are provided with adjustment components. The inner sides of the precooling pipeline and the liquid nitrogen pipeline are respectively provided with flow-turbulence components.

[0008] As a further description of the above technical solution:

[0009] The pressure relief mechanism includes a second sealing cover, the left side of which is located on the right side of the storage tank. A discharge pipe is connected to the middle of the right side of the second sealing cover. A flange is fixedly connected between the second sealing cover and the adjacent discharge pipe. A venting line is connected to the right side of the discharge pipe.

[0010] As a further description of the above technical solution:

[0011] The regulating assembly includes two valve ports, the bottom of which is opened at the top of two LNG low-pressure export pipelines, and the top of each valve port is rotatably connected to an regulating handle.

[0012] As a further description of the above technical solution:

[0013] The flow-disrupting component includes multiple metal blocks, with the opposite sides of the multiple metal blocks respectively fixedly connected to adjacent sides inside the liquid nitrogen pipeline and the precooling pipeline, and spiral guide vanes fixedly connected between adjacent metal blocks.

[0014] As a further description of the above technical solution:

[0015] Multiple metal fins are fixedly connected to the outside of both the precooling pipeline and the liquid nitrogen pipeline, and an on / off valve is installed at the top of the venting pipeline.

[0016] As a further description of the above technical solution:

[0017] The explosion-proof mechanism includes a mounting ring, the right side of which is threadedly connected to the inside right side of the storage tank, and an explosion-proof plate is fixedly connected to the left side of the mounting ring. Threaded rods are threadedly connected to all four sides of the left side of the mounting ring.

[0018] As a further description of the above technical solution:

[0019] A display is fixedly connected to the front of the storage tank, and two sensors are fixedly connected to the top and bottom of the display.

[0020] As a further description of the above technical solution:

[0021] The insulating support mechanism includes two antistatic concave blocks, the bottoms of which are fixedly connected to the tops of two stainless steel base frames, and two stainless steel support rods are fixedly connected between adjacent antistatic concave blocks.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, the LNG low-pressure export pipeline, pre-cooling pipeline, and liquid nitrogen pipeline are integrated by a sealing cover. LNG and liquid nitrogen can be introduced to achieve simultaneous pre-cooling of liquid nitrogen and LNG. The flow-limiting cover can effectively prevent leakage of the two media. The regulating component can regulate and open / close the flow of the media. The flange ensures the pipeline sealing stability. This not only reduces the cost and loss of single-media pre-cooling, but also avoids the risk of local overcooling, and improves the pre-cooling efficiency and safety of the LNG storage tank.

[0024] 2. In this utility model, the sealing cover is connected to the right side of the storage tank, and a complete pressure relief channel is formed by relying on the discharge pipe and the venting line. The flange ensures reliable sealing at the connection and avoids leakage risk. When the pressure in the storage tank exceeds the limit, the overpressure gas can be quickly discharged through the discharge pipe and the venting line to achieve effective pressure relief and prevent equipment damage or safety accidents caused by excessive pressure. The structure is simple and highly adaptable, and can accurately respond to pressure fluctuations during the pre-cooling process, providing stable pressure safety guarantee for mixing and pre-cooling. Attached Figure Description

[0025] Figure 1 This is a perspective view of a liquid nitrogen LNG two-phase precooling safety device proposed in this utility model;

[0026] Figure 2 This is a front view of a liquid nitrogen LNG two-phase precooling safety device proposed in this utility model;

[0027] Figure 3 This is a structural cross-sectional view of the storage tank in a liquid nitrogen LNG two-phase precooling safety device proposed in this utility model;

[0028] Figure 4 This is a schematic diagram of the cooling mechanism in a liquid nitrogen LNG two-phase precooling safety device proposed in this utility model;

[0029] Figure 5 This is a schematic diagram of the liquid nitrogen pipeline in a liquid nitrogen LNG two-phase precooling safety device proposed in this utility model;

[0030] Figure 6This is a structural exploded view of the pressure relief mechanism in a liquid nitrogen LNG two-phase precooling safety device proposed in this utility model.

[0031] Legend:

[0032] 1. Stainless steel base frame; 2. Storage tank; 3. Cooling mechanism; 301. Sealing cover one; 302. LNG low-pressure external transmission pipeline; 303. Flange one; 304. Precooling pipeline; 305. Flow limiting cover; 306. Pipeline inlet; 307. Liquid nitrogen transmission pipeline; 308. Adjustment assembly; 3081. Valve port; 3082. Adjustment handle; 309. Flow turbulence assembly; 3091. Metal block; 3092. Spiral guide vane; 4. Pressure relief mechanism; 401. Sealing cover two; 402. Flange two; 403. Discharge pipeline; 404. Vent pipeline; 5. Metal fins; 6. On / off valve; 7. Explosion-proof mechanism; 701. Mounting ring; 702. Explosion-proof plate; 703. Threaded rod; 8. Display; 10. Sensor; 9. Insulating support mechanism; 901. Antistatic concave block; 902. Stainless steel support rod. Detailed Implementation

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

[0034] Reference Figure 3 , Figure 4 and Figure 5 An embodiment of this utility model provides a liquid nitrogen LNG two-phase precooling safety device, including two stainless steel base frames 1, with the same storage tank 2 installed on the top of each of the two stainless steel base frames 1. A cooling mechanism 3 is installed on the left side of the storage tank 2 for precooling the tank body, and a pressure relief mechanism 4 is installed on the right side of the storage tank 2 for depressurizing the tank body. An explosion-proof mechanism 7 is installed on the right side of the inside of the storage tank 2 for explosion protection. An insulating support mechanism 9 is installed on the top of each of the two stainless steel base frames 1 for eliminating static electricity and providing auxiliary support.

[0035] The cooling mechanism 3 includes a sealing cover 301. The right side of the sealing cover 301 is located on the left side of the storage tank 2. The upper left side and the front left side of the sealing cover 301 are connected to LNG low-pressure export pipelines 302. Each of the two LNG low-pressure export pipelines 302 has a pipeline inlet 306 on its left side. Multiple flanges 303 are fixedly connected to the outside of each of the two LNG low-pressure export pipelines 302. The upper and lower right sides and the front and rear ends of the right side of the sealing cover 301 are connected to a pre-cooling pipeline 304 and a liquid nitrogen pipeline 307, respectively. The bottom left end of the pre-cooling pipeline 304 and the... A flow-limiting cover 305 is installed on the left side of the front side of the liquid nitrogen pipeline 307. The LNG low-pressure export pipeline 302, the pre-cooling pipeline 304, and the liquid nitrogen pipeline 307 are integrated through the sealing cover 301. LNG and liquid nitrogen can be introduced at the same time to achieve mixed pre-cooling of liquid nitrogen and LNG. The flow-limiting cover 305 can effectively prevent leakage of the two media. The flange 303 ensures the pipeline is sealed and stable. The top of the two LNG low-pressure export pipelines 302 is equipped with an adjustment component 308. The inner side of the pre-cooling pipeline 304 and the liquid nitrogen pipeline 307 are equipped with a flow-turbulence component 309.

[0036] Specifically, the cooling mechanism 3 achieves efficient mixing and precooling of liquid nitrogen and LNG through the integrated design of the sealing cover 301. The right side of the sealing cover 301 is tightly connected to the left side of the storage tank 2, forming a closed medium conversion hub. The two low-pressure LNG export pipelines 302 on the left side introduce LNG medium through the pipeline inlet 306. The precooling pipeline 304 and the liquid nitrogen pipeline 307 on the right side are responsible for transporting LNG medium and liquid nitrogen respectively, ensuring that the two cryogenic media enter the storage tank 2 at the same time, thus solving the efficiency shortcomings of traditional single-medium precooling.

[0037] The flow-limiting cover 305 is installed at the bottom left end of the precooling pipeline 304 and the front left end of the liquid nitrogen pipeline 307, respectively, to prevent media leakage through a mechanical seal structure;

[0038] The multiple flanges 303 fixed externally to the two LNG low-pressure export pipelines 302 can maintain good sealing performance within the temperature fluctuation range from room temperature to low temperature, preventing cold loss or media leakage caused by loose pipeline connections, reducing energy consumption in the mixing and precooling process, shortening the precooling cycle, and meeting the dual requirements of safety and economy.

[0039] Reference Figure 1 , Figure 2 and Figure 6The pressure relief mechanism 4 includes a second sealing cover 401. The left side of the second sealing cover 401 is located on the right side of the storage tank 2. A discharge pipe 403 is connected to the middle of the right side of the second sealing cover 401. A flange 402 is fixedly connected between the second sealing cover 401 and the discharge pipe 403. A venting line 404 is connected to the right side of the discharge pipe 403. The second sealing cover 401 is connected to the right side of the storage tank 2. A complete pressure relief channel is formed by the discharge pipe 403 and the venting line 404. The flange 402 ensures a reliable seal at the connection and avoids the risk of leakage. When the pressure in the storage tank 2 exceeds the limit, the overpressure gas can be quickly discharged through the discharge pipe 403 and the venting line 404.

[0040] Specifically, the pressure relief mechanism 4 constructs a simple and efficient overpressure protection system. The left side of the sealing cover 401 is fastened to the right side of the storage tank 2 with bolts, which not only prevents the leakage of low temperature medium in the storage tank 2, but also provides a stable channel for pressure transmission. The discharge pipe 403 in the middle of the right side is made of seamless steel pipe, and the inner wall is polished to reduce airflow resistance and ensure rapid flow of overpressure gas.

[0041] The flange 402 between the sealing cover 401 and the discharge pipe 403 is installed by uniformly tightening bolts, which strengthens the pressure resistance of the connection and eliminates the risk of media leakage. The venting line 404 connected to the right side of the discharge pipe 403 can effectively reduce the gas flow rate and avoid pipe vibration.

[0042] When the pressure inside storage tank 2 exceeds the set threshold due to temperature changes during the pre-cooling stage, the valve assembly outside the sealing cover 401 opens, and the overpressure gas is discharged sequentially through the discharge pipe 403 and the venting line 404. The pressure inside the tank can be reduced to a safe range within seconds. The entire depressurization process is responsive and has a smooth path, providing a stable pressure safety barrier for mixing and pre-cooling, and effectively avoiding the risk of tank deformation or explosion that may be caused by a sudden increase in pressure.

[0043] Reference Figure 4 , Figure 5 and Figure 6 The regulating component 308 includes two valve ports 3081. The bottom of each valve port 3081 is opened on the top of the two LNG low-pressure external transmission pipelines 302. The top of each valve port 3081 is rotatably connected to an adjusting handle 3082 for opening, closing or adjusting the medium flow. The turbulence component 309 includes multiple metal blocks 3091. The opposite sides of the multiple metal blocks 3091 are respectively fixedly connected to the adjacent sides inside the liquid nitrogen transmission pipeline 307 and the precooling pipeline 304. The adjacent metal blocks 3091 are fixedly connected to a spiral guide vane 3092. The outer sides of the precooling pipeline 304 and the liquid nitrogen transmission pipeline 307 are fixedly connected to multiple metal fins 5. The top of the venting pipeline 404 is provided with an opening and closing valve 6.

[0044] Specifically, the regulating component 308 achieves precise control of the medium flow rate through the through-connection design between the valve port 3081 and the LNG low-pressure external transmission pipeline 302. Rotating the regulating handle 3082 can drive the internal valve core to rotate. When the handle is rotated clockwise to the limit position, the valve core completely blocks the valve port 3081, cutting off the LNG delivery. Rotating counterclockwise will gradually open the channel, which can flexibly adjust the LNG input amount to meet the needs of the pre-cooling stage and form the best mixing ratio with liquid nitrogen.

[0045] The turbulence component 309 enhances the mixing effect of the medium through the combination of metal block 3091 and spiral guide vane 3092. The metal block 3091 is fixed to the inner wall of liquid nitrogen pipeline 307 and precooling pipeline 304, supporting the spiral guide vane 3092 to form a continuous flow channel. When the cold air flows through, it will generate a strong swirling flow along the guide vane, which will promote the improvement of heat exchange efficiency and avoid local temperature unevenness.

[0046] The metal fins 5 on the outside of the precooling pipeline 304 and the liquid nitrogen pipeline 307 increase the contact area with the outside air, which can quickly dissipate the cold air generated by the pipeline's cooling capacity. The on / off valve 6 at the top of the venting pipeline 404 is a manual shut-off valve, which is normally kept closed and only opened in case of emergency pressure relief. Together with the automatic pressure relief system, it forms a double safety guarantee, ensuring operational flexibility and system safety.

[0047] Reference Figure 1 , Figure 2 and Figure 3 The explosion-proof mechanism 7 includes a mounting ring 701. The right side of the mounting ring 701 is threadedly connected to the inside right side of the storage tank 2. An explosion-proof plate 702 is fixedly connected to the left side of the mounting ring 701. Threaded rods 703 are threadedly connected to the left side of the mounting ring 701 for explosion protection. A display 8 is fixedly connected to the front side of the outside of the storage tank 2. Two sensors 10 are fixedly connected to the top and bottom sides of the display 8. The insulating support mechanism 9 includes two anti-static concave blocks 901. The bottom of the two anti-static concave blocks 901 is fixedly connected to the top of two stainless steel base frames 1. Two stainless steel support rods 902 are fixedly connected between adjacent anti-static concave blocks 901 for eliminating static electricity and providing auxiliary support.

[0048] Specifically, the explosion-proof mechanism 7 is securely fixed to the inner wall of the storage tank 2 through the threaded connection of the mounting ring 701. The explosion-proof plate 702 on the left side is made of thick nickel alloy and is designed to precisely match the explosion pressure with the safety threshold of the storage tank 2. The threaded rods 703 around the perimeter can adjust the preload of the explosion-proof plate 702 to ensure instantaneous rupture and pressure relief in case of overpressure. It can quickly release energy under extreme pressure and provide an explosion-proof barrier for the storage tank 2.

[0049] The external display 8 of the storage tank 2 displays the data collected by the sensor 10 in real time, including the temperature and pressure inside the tank. The four sensors 10 on the upper and lower sides monitor parameters in different areas, forming a three-dimensional monitoring network, which facilitates timely intervention by operators when data is abnormal.

[0050] The antistatic concave block 901 of the insulating support mechanism 9 is made of composite conductive rubber. It achieves static discharge by connecting the bottom to the stainless steel base frame 1, eliminating the accumulation of static electricity generated by the flow of medium during the pre-cooling process. The stainless steel support rod 902 in the middle rigidly connects the two antistatic concave blocks 901, improving the support strength. This not only prevents the storage tank 2 from shaking, but also blocks the influence of low temperature conduction on the base frame, thus balancing safety and stability.

[0051] Working principle: During operation, the overall structure is first supported by two stainless steel base frames 1. The two anti-static concave blocks 901 in the insulating support mechanism 9 are connected to the stainless steel base frame 1 through the bottom. Together with the stainless steel support rod 902 in the middle, they not only eliminate the static electricity generated by the flow of the medium during the pre-cooling process, but also strengthen the support of the storage tank 2, prevent shaking and block the conduction of low temperature.

[0052] After the cooling mechanism 3 is started, LNG enters through the pipeline inlet 306 of the LNG low-pressure export pipeline 302, while liquid nitrogen output from the liquid nitrogen tanker is transported through the liquid nitrogen pipeline 307. The regulating handle 3082 of the regulating component 308 can adjust the flow rate of the two media through the valve port 3081 to adapt to the needs of different pre-cooling stages. The flow restrictor cover 305 prevents media leakage, and the flange 303 ensures the pipeline is sealed and stable. The metal block 3091 of the turbulence component 309 supports the spiral guide vane 3092, so that the cold air forms a swirling flow when it flows through the pre-cooling pipeline 304 and the liquid nitrogen pipeline 307, which enhances mixing and heat exchange. The outer metal fins 5 help to dissipate the cold energy.

[0053] During the precooling process, if the pressure inside the storage tank 2 increases, the pressure relief mechanism 4 will start working. The sealing cover 401 and the discharge pipe 403 are sealed and connected through the flange 402. The overpressure gas enters the venting line 404 through the discharge pipe 403 and is discharged. The opening and closing valve 6 at the top of the venting line 404 can be manually operated in an emergency, forming a double protection with the automatic pressure relief. In the explosion-proof mechanism 7, the explosion-proof plate 702 fixed by the mounting ring 701 will rupture and relieve pressure when the pressure inside the tank exceeds the limit. The threaded rod 703 can adjust the pre-tightening force. The display 8 on the outside of the storage tank 2 displays the temperature and pressure data collected by the sensor 10 in real time, which is convenient for operators to monitor the equipment status and ensure that the entire precooling process is carried out safely and efficiently.

[0054] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A liquid nitrogen LNG two-phase precooling safety device, comprising two stainless steel base frames (1), characterized in that: The top of each of the two stainless steel base frames (1) is provided with the same storage tank (2). A cooling mechanism (3) is provided on the left side of the storage tank (2) for pre-cooling the tank body. A pressure relief mechanism (4) is provided on the right side of the storage tank (2) for depressurizing the tank body. An explosion-proof mechanism (7) is provided on the right side inside the storage tank (2). An insulating support mechanism (9) is provided on the top of each of the two stainless steel base frames (1). The cooling mechanism (3) includes a sealing cover (301), the right side of which is located on the left side of the storage tank (2). The upper left side and the front left side of the sealing cover (301) are connected to LNG low-pressure export pipelines (302). Each of the two LNG low-pressure export pipelines (302) has a pipeline inlet (306) on its left side. Multiple flanges (303) are fixedly connected to the outside of each of the two LNG low-pressure export pipelines (302). The upper and lower right ends and the front and rear ends of the right side of the cover (301) are respectively connected to the precooling pipeline (304) and the liquid nitrogen pipeline (307). The bottom left end of the precooling pipeline (304) and the front left end of the liquid nitrogen pipeline (307) are respectively provided with flow limiting covers (305). The top of the two LNG low-pressure external pipelines (302) are provided with regulating components (308). The inner sides of the precooling pipeline (304) and the liquid nitrogen pipeline (307) are respectively provided with flow turbulence components (309).

2. The liquid nitrogen LNG two-phase precooling safety device according to claim 1, characterized in that: The pressure relief mechanism (4) includes a second sealing cover (401), the left side of which is located on the right side of the storage tank (2). A discharge pipe (403) is connected to the middle of the right side of the second sealing cover (401). A flange (402) is fixedly connected between the second sealing cover (401) and the discharge pipe (403). A venting line (404) is connected to the right side of the discharge pipe (403).

3. The liquid nitrogen LNG two-phase precooling safety device according to claim 1, characterized in that: The regulating assembly (308) includes two valve ports (3081), the bottom of which is opened on the top of two LNG low-pressure export pipelines (302), and the top of each valve port (3081) is rotatably connected to an regulating handle (3082).

4. The liquid nitrogen LNG two-phase precooling safety device according to claim 1, characterized in that: The turbulence assembly (309) includes a plurality of metal blocks (3091), the opposite sides of the plurality of metal blocks (3091) are respectively fixedly connected to the adjacent sides inside the liquid nitrogen pipeline (307) and the precooling pipeline (304), and a spiral guide vane (3092) is fixedly connected between the adjacent of the plurality of metal blocks (3091).

5. A liquid nitrogen LNG two-phase precooling safety device according to claim 2, characterized in that: Multiple metal fins (5) are fixedly connected to the outside of the precooling pipeline (304) and the liquid nitrogen pipeline (307), and an opening and closing valve (6) is provided at the top of the venting pipeline (404).

6. The liquid nitrogen LNG two-phase precooling safety device according to claim 1, characterized in that: The explosion-proof mechanism (7) includes a mounting ring (701), the right side of which is threadedly connected to the inside right side of the storage tank (2), and an explosion-proof plate (702) is fixedly connected to the left side of the mounting ring (701). Threaded rods (703) are threadedly connected to all four sides of the left side of the mounting ring (701).

7. The liquid nitrogen LNG two-phase precooling safety device according to claim 1, characterized in that: A display (8) is fixedly connected to the front of the storage tank (2), and two sensors (10) are fixedly connected to the upper and lower sides of the display (8).

8. The liquid nitrogen LNG two-phase precooling safety device according to claim 1, characterized in that: The insulating support mechanism (9) includes two antistatic concave blocks (901), the bottoms of the two antistatic concave blocks (901) are fixedly connected to the tops of the two stainless steel base frames (1), and two stainless steel support rods (902) are fixedly connected between adjacent antistatic concave blocks (901).

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