Remote liquid sodium conveying system

Abstract

The invention discloses a remote liquid sodium conveying system, and belongs to the technical field of liquid metal conveying and a method. A bottom pipeline of the sodium storage tank is communicated with a coil pipe in the heat exchange oil tank, a heat exchange medium is stored in the heat exchange oil tank, a fourth heating device is arranged at the bottom of the heat exchange oil tank, and a return pipe and an exhaust pipe are arranged at the upper part of the heat exchange oil tank; the tail end of the return pipe is communicated with the top of the sodium storage tank, and the other end of the exhaust pipe and the other end of the coil pipe are both communicated with a confluence pipe; the other end of the confluence pipe is communicated with the top of the settling tank; a sodium discharging opening is formed in the bottom of the settling tank, and the sodium collecting tank is positioned below the settling tank and is communicated with the sodium discharging opening through a pipeline. High-temperature energy of electrolytic metal sodium is utilized, heat waste is avoided, energy consumption and cost of remote liquid metal sodium conveying can be reduced, a purging function is achieved, residual metal sodium in a pipeline can be avoided, conveying safety is improved, and maintenance is convenient.

Description

Technical Field

[0001] This invention belongs to the field of liquid metal transportation technology, specifically a liquid sodium remote transportation system. Background Technology

[0002] When liquid sodium is transported via pipeline, it solidifies below 97.81℃. A common method, as described in patent CN210661868U ("A Long-Distance Liquid Sodium Transport System"), uses electrically heated heat tracing pipes to maintain pipeline temperature. However, this method has several drawbacks. First, electromagnetic induction pumps can only transport liquid sodium. When the pump stops, sodium residue remains in the pipeline, and without a purging system, this residue solidifies and clogs the pipe. Second, even with inert gas purging, the high density of liquid sodium causes it to settle at the bottom of the pipeline while the gas floats at the top, making it difficult to remove the residual sodium. Furthermore, the consumption of inert gas is high, leading to significant costs. Third, externally installed electric heating devices are necessary because liquid sodium has a high specific heat capacity, heats up slowly, and is in a flowing state. To heat it to the desired temperature, a long electric heating zone is required, sometimes even the entire pipeline needs to be equipped with electric heating devices, which operate for extended periods, resulting in high energy consumption. Furthermore, a significant amount of heat is lost from external heating without being absorbed by the sodium inside the pipeline, leading to substantial heat waste. Fourth, for most sodium production companies, the conductive lines running along the pipelines are long and located outdoors, making them prone to aging and leakage due to wind and rain, resulting in frequent malfunctions. Fifth, for most sodium production companies, the transport pipelines are typically suspended to avoid occupying too much space, making the maintenance and repair of the electric heating devices and wiring difficult. Sixth, liquid sodium is produced through electrolysis, and the resulting liquid sodium generally has a base temperature of around 600°C. It cannot be directly transported; otherwise, the pipelines and pumping equipment would experience severe thermal expansion and contraction, which would be unbearable. It usually needs to be cooled to around 200°C before transport, resulting in significant heat waste and high overall energy consumption of the production system. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a liquid sodium remote transportation system, which aims to avoid the use of electric heating to heat the pipeline, improve heat exchange efficiency, reduce failure rate and maintenance cost, absorb and utilize the high basic heat energy of electrolyzed metallic sodium and convert it into transportation power, thus saving energy and reducing consumption; the system itself has a purging capability to prevent residual metallic sodium in the pipeline after transportation is completed.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a remote liquid sodium conveying system, comprising a sodium storage tank and a sodium collection box located at the conveying end and receiving end, respectively; the bottom pipe of the sodium storage tank is connected to a coil in a heat exchange oil tank, the heat exchange oil tank contains a heat exchange medium, a fourth heating device is provided at its bottom, and a return pipe and an exhaust pipe are provided at its upper part; the end of the return pipe is connected to the top of the sodium storage tank, and the other end of the exhaust pipe and the other end of the coil are both connected to a confluence pipe; the other end of the confluence pipe is connected to the upper part of a first relay tank, the first relay tank is provided with a first heating device, and its lower outlet is connected to a conveying pipe, the conveying... The other end of the pipe is connected to the top of the sedimentation tank located at the receiving end; the bottom of the sedimentation tank is provided with a sodium discharge port, and the sodium collection tank is located below the sedimentation tank and is connected to the sodium discharge port through a pipe; a plug blocks the sodium discharge port from inside the sedimentation tank, and the upper end of the plug is connected to a pull rope, and the upper end of the pull rope is connected to a specific gravity float; the specific gravity float, the pull rope, and the plug constitute a float mechanism; the liquid density of the heat exchange medium is less than the density of liquid metallic sodium, and the overall density of the float mechanism is between the density of the heat exchange medium and the density of liquid metallic sodium; the heat exchange medium is a liquid substance that does not react with metallic sodium, and its boiling point is greater than the melting point of metallic sodium.

[0005] As a further optimization, the heat exchange medium is one of four substances: paraffin oil, dodecane, butyl ether, and diethylene glycol diethyl ether.

[0006] As a further optimization, the merging pipe includes an upper pipe and a lower pipe arranged vertically; the upper pipe and the lower pipe are connected to each other as a whole pipe fitting by multiple spaced vertical pipes; the whole pipe fitting is wrapped with an insulation layer; the upper pipe is connected to the exhaust pipe, and the lower pipe is connected to the coil.

[0007] As a further optimization, it also includes several second relay tanks installed on the conveying pipe; each second relay tank is equipped with a second heating device, with a discharge port at its lower end and a feed port at its upper part; the discharge port of the previous second relay tank and the feed port of the next second relay tank are connected in series through the conveying pipe; the feed port of the foremost second relay tank is connected to the discharge port of the first relay tank through the conveying pipe; the discharge port of the last second relay tank is connected to the sedimentation tank through the conveying pipe.

[0008] As a further optimization, an electric valve is provided on the conveying pipe between the two second relay tanks; the two ends of the parallel pipe are respectively connected to the conveying pipes before and after the electric valve, and a plunger pump is provided on the parallel pipe; a pressure sensor is provided on the conveying pipe at the front end of the electric valve.

[0009] As a further optimization, a third heating device is provided at the bottom of the sedimentation tank.

[0010] As a further optimization, a pressure relief valve is connected to the top of the sedimentation tank.

[0011] As a further optimization, there are multiple sedimentation tanks, and the upper parts of two adjacent sedimentation tanks are connected in series by a connecting pipe; the end of the conveying pipe is connected to the top of the foremost sedimentation tank.

[0012] As a further optimization, a discharge pipe is connected to the bottom of the sedimentation tank, and a shut-off valve is provided on the discharge pipe.

[0013] As a further optimization, the sodium storage tank is connected to a sodium inlet pipeline and an air inlet pipeline.

[0014] The advantages of this invention are as follows: First, the pumping power mainly comes from the energy generated by the base temperature of electrolyzed sodium, saving energy and reducing costs. Second, the heat tracing also partially comes from the heat generated by the base temperature of electrolyzed sodium, reducing energy consumption. Third, the confluence pipe can accelerate oil and gas transportation, accelerate the delivery of heat to distant locations, preheat distant pipelines, and reduce thermal shock. Fourth, the oil vapor in the heat exchange tank can act as a self-purifying agent, meaning the system has a built-in purging function, preventing residual sodium in the pipeline. Fifth, the delivery pipeline avoids the use of electric heating devices, instead using a mixture of sodium and oil for transportation, resulting in high heat exchange efficiency, reduced heat consumption, and longer transportation distances. Sixth, the delivery pipeline has no connecting wires or electric heating devices, resulting in a low failure rate, long service life, and ease of high-altitude installation and maintenance. In summary, this invention utilizes the high-temperature energy of electrolyzed sodium, avoiding heat waste, reducing energy consumption and costs for long-distance transportation of liquid sodium, and has a built-in purging function to prevent residual sodium in the pipeline, improving transportation safety and facilitating maintenance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the system structure according to an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the confluence pipe according to an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the sedimentation tank according to an embodiment of the present invention.

[0018] The technical features in the figure correspond to the reference numerals as follows: Sodium storage tank 1; Sodium inlet pipeline 11; Air inlet pipeline 12; Sodium collection box 2; Heat exchange oil tank 3; Coil 31; Fourth heating device 32; Return pipe 33; Exhaust pipe 34; Combination pipe 4; Upper pipe 41; Lower pipe 42; Vertical pipe 43; Insulation layer 44; First relay tank 5; First heating device 51; Conveying pipe 6; Sedimentation tank 7; Sodium discharge port 71; Support 72; Third heating device 73; Pressure relief valve 74; Connecting pipe 75; Discharge pipe 76; Shut-off valve 77; Second relay tank 8; Second heating device 81; Electric valve 82; Parallel pipeline 83; Plunger pump 84; Specific gravity float 9; Plug 91; Pull rope 92. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some preferred embodiments of the present invention, and not all embodiments. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0020] Example: This invention provides a remote liquid sodium transport system, including a sodium storage tank 1 and a sodium collection box 2 located at the transport end and the receiving end, respectively; the bottom pipe of the sodium storage tank 1 is connected to a coil 31 in a heat exchange oil tank 3, the heat exchange oil tank 3 contains a heat exchange medium, and its upper part is provided with a return pipe 33 and an exhaust pipe 34, the end of the return pipe 33 is connected to the top of the sodium storage tank 1, and the other end of the exhaust pipe 34 and the other end of the coil 31 are both connected to a confluence pipe 4; the other end of the confluence pipe 4 is connected to the upper part of a first relay tank 5, the first relay tank 5 is provided with a first heating device 51, the lower end of which is connected to a transport pipe 6, and the other end of the transport pipe 6 is connected to the upper part of the first relay tank 5. The receiving end has a sedimentation tank 7 at the top; the bottom of the sedimentation tank 7 is provided with a sodium discharge port 71, the sodium collection tank 2 is located below the sedimentation tank 7 and is connected to the sodium discharge port 71 through a pipe; a plug 91 blocks the sodium discharge port 71 from inside the sedimentation tank 7, the upper end of the plug 91 is connected to a pull rope 92, and the upper end of the pull rope 92 is connected to a specific gravity float 9; the specific gravity float 9, the pull rope 92 and the plug 91 form a float mechanism; the liquid density of the heat exchange medium is less than the density of liquid metallic sodium, and the overall density of the float mechanism is between the density of the heat exchange medium and the density of liquid metallic sodium; the heat exchange medium is a liquid substance that does not react with metallic sodium, and its boiling point is greater than the melting point of metallic sodium.

[0021] This embodiment uses paraffin oil as an example. It does not chemically react with metallic sodium, has a lower density than liquid metallic sodium, and a boiling point higher than the melting point of metallic sodium. Based on this, heat exchange media similar to paraffin oil also include dodecane, butyl ether, and diethylene glycol diethyl ether.

[0022] In operation, initially, the fourth heating device 32 is shut off. Paraffin oil is present in the heat exchange oil tank 3, relay tank, and sedimentation tank 7, with an oil temperature of approximately 200°C. The sodium storage tank 1 contains freshly electrolyzed liquid metallic sodium, with a base temperature of 600°C-800°C. First, when the liquid metallic sodium enters the coil 31 by its own weight, it heats the paraffin oil in the heat exchange oil tank 3, raising it to its boiling point of 255°C-276°C, generating oil vapor. This high-pressure oil vapor flows through the return pipe 33 into the sodium storage tank 1, propelling the liquid metallic sodium further into the coil 31. This generates the force that drives the liquid metallic sodium out of the coil 31, which then drains into the confluence pipe 4. Preferably, the return pipe 33 is equipped with a shut-off valve. Simultaneously, the oil vapor from the heat exchange oil tank 3 also enters the confluence pipe 4, moving in parallel with the metallic sodium, thus providing heat tracing. At this point, the heat of the liquid sodium is absorbed by the paraffin oil, causing the temperature to drop to around 250°C, at which point it can be transported through the pipeline, its base temperature heat converted into propulsion. Then, as the oil and gas and sodium travel through the confluence pipe 4, the temperature gradually decreases. The oil and gas first fall below their boiling point and return to a liquid state; this vapor-to-liquid process also releases heat, continuing to heat the sodium and keeping it liquid. During transport, the temperature gradually decreases. Paraffin oil has a good specific heat capacity, allowing it to store a significant amount of energy and provide heat to the liquid sodium from within the pipeline, resulting in high heat utilization, minimal waste, and energy savings. Since the boiling point of paraffin oil is above 250°C, even after returning to a liquid state, it only reaches a temperature of around 200°C, sufficient to keep the sodium liquid. Before the temperature drops to the melting point of sodium (e.g., before 150°C), it reaches the first relay tank 5, where the sodium droplets disperse in the paraffin oil, forming a sodium-oil mixture.

[0023] The length of the confluence pipe 4 represents the distance of the first transport stage. The liquid sodium transport temperature in the first stage is 150℃-250℃, requiring no additional heating; proper insulation is sufficient to extend the distance of the first transport stage. Preferably, the confluence pipe 4 includes an upper pipe 41 and a lower pipe 42 arranged vertically. The upper pipe 41 and the lower pipe 42 are connected into a single integral pipe fitting by multiple spaced vertical pipes 43. The integral pipe fitting is wrapped with an insulation layer 44. The upper pipe 41 is connected to the exhaust pipe 34, and the lower pipe 42 is connected to the coil 31. Since the oil and gas are gaseous, they tend to rise and mainly travel in the upper pipe 41, while the liquid sodium tends to rise and mainly travel in the lower pipe 42. This results in a fast oil and gas transport speed, quickly delivering heat to the distant end before returning to a liquid state, thus extending the distance of the first transport stage. Furthermore, the rapidly moving oil and gas can preheat the distant pipeline, reducing thermal shock, avoiding rapid thermal expansion and contraction, and improving pipeline lifespan. The heat emitted by the upper pipe 41 is encased in the insulation layer 44, reducing heat loss and further extending the distance of the first conveying stage. This stage fully utilizes the base temperature of the freshly electrolyzed liquid sodium metal, eliminating the need for additional heating devices and reducing equipment and energy costs. Furthermore, the confluence pipe 4 can be installed at a high altitude to reduce site occupation, requires no heating devices, and has low maintenance costs.

[0024] In the first relay tank 5, under the action of the first heating device 51 and the pre-stored high-temperature paraffin oil, due to the high density of metallic sodium, it will flow to the bottom of the first relay tank 5, and the metallic sodium-paraffin oil mixture will finally be output from the delivery pipe 6. During the falling process, the metallic sodium droplets are completely coated with paraffin oil, and the contact area with the high-temperature paraffin oil is large, resulting in high heat exchange efficiency, reheating, and ensuring that the metallic sodium remains in a liquid state.

[0025] The distance between the first relay tank 5 and the settling tank 7 constitutes the second conveying stage. The temperature of the liquid sodium in this stage can be lowered to slow heat loss; the temperature is 150℃-200℃. The first heating device 51, which supplements heat in this stage, is determined by the conveying distance. A relay heating mechanism is added only when the required conveying distance exceeds the distance of the first stage, allowing for a longer liquid sodium conveying distance. More preferably, the system also includes several second relay tanks 8 mounted on the conveying pipe 6. Each second relay tank 8 is equipped with a second heating device 81, with a discharge port at its lower end and a feed port at its upper end. The discharge port of one second relay tank 8 is connected to the feed port of the next second relay tank 8 via the conveying pipe 6, thus connecting multiple second relay tanks 8 in series. The feed port of the foremost second relay tank 8 is connected to the discharge port of the first relay tank 5 via the conveying pipe 6. The discharge port of the last second relay tank 8 is connected to the settling tank 7 via the conveying pipe 6. Multiple relay heating mechanisms are used to continuously heat the pipes, ensuring that the delivery temperature remains between 150℃ and 200℃. Meanwhile, all relay heating mechanisms can be installed on the ground, while the delivery pipe 6 is erected at high altitude and wrapped with an insulation layer 44, reducing the space required. Furthermore, the delivery pipe 6 is made of stainless steel, without wires or heating devices, requiring almost no maintenance and resulting in low inspection and maintenance costs.

[0026] After the gold-oil mixture reaches the settling tank 7, metallic sodium and paraffin oil are separated by gravity. This allows for the collection of metallic sodium; the denser liquid metallic sodium sinks, while the less dense paraffin oil floats. The liquid sodium level gradually rises until it pushes the gravity float 9 to the surface. The float, via the pull rope 92, pulls the plug 91, opening the sodium discharge port 71. The liquid metallic sodium enters the sodium collection tank 2. Simultaneously, the liquid sodium level drops, causing the gravity float 9 to sink until the plug 91 closes the sodium discharge port 71. Therefore, the sodium discharge operation in the settling tank 7 is automatic, requires no power, and is sealed, preventing contact with air. Preferably, the bottom of the settling tank 7 is equipped with a third heating device 73 and a temperature sensor to maintain the temperature inside the settling tank 7 at approximately 150°C, allowing sufficient settling time for the liquid metallic sodium. More preferably, the top of the settling tank 7 is connected to a pressure relief valve 74 to release excess oil and gas, preventing excessive pressure in the settling tank 7 from creating resistance and hindering the transport of metallic sodium. The specific gravity float 9 is supported by a bracket 72 fixed in the settling tank 7 to prevent it from tilting and to ensure that it can open the sodium discharge port 71 when it floats. Thus, the flow of metallic sodium is entirely driven by the steam pressure of the heat exchange oil tank 3, reducing pumping equipment costs and energy consumption. However, to ensure sufficient delivery pressure of metallic sodium at the far end of the system, it is preferable to install an electric valve 82 on the delivery pipe 6 between the two second relay tanks 8; the two ends of the parallel pipe 83 are respectively connected to the delivery pipe 6 before and after the electric valve 82, and a plunger pump 84 is installed on the parallel pipe 83. Under normal conditions, the electric valve 82 is open and the plunger pump 84 is off. When the pressure sensor detects that the pressure in the delivery pipe 6 is lower than the preset pressure, the electric valve 82 closes and the plunger pump 84 opens, increasing the pumping pressure at the appropriate delivery point. It should be noted that the components in contact with metallic sodium, such as the specific gravity float 9, are all made of high-temperature resistant materials that do not react with metallic sodium. These materials are all existing technologies, such as stainless steel.

[0027] At the conveying end, after the sodium in the storage tank 1 has been completely discharged, there is no more heat to supply to the heat exchange oil tank 3. At this time, the fourth heating device 32 is turned on to continue heating the heat exchange oil tank 3, forcing the oil and gas to continue to propel the sodium in the pipeline system towards the receiving end. This serves to clean the residual sodium in the pipeline until all the sodium has entered the settling tank 7. Then, the fourth heating device 32 is turned off, completing the cleaning. Preferably, there are multiple settling tanks 7, and the upper parts of two adjacent settling tanks 7 are connected in series by a connecting pipe 75; the end of the conveying pipe 6 is connected to the top of the foremost settling tank 7. Multiple settling tanks 7 work simultaneously, which improves the efficiency of sodium precipitation and recovery, and also provides sufficient space to accommodate excess paraffin oil. More preferably, the bottom of the settling tank 7 is connected to a discharge pipe 76, and the discharge pipe 76 is equipped with a shut-off valve 77. Once all the metallic sodium has entered the settling tank 7, and no more metallic sodium is added, the specific gravity float 9 will no longer rise. At this point, the settling tank 7 still contains residual metallic sodium. Open the shut-off valve 77 to discharge the remaining metallic sodium. When paraffin oil is discharged from the discharge pipe 76, it indicates that the metallic sodium in the settling tank 7 has been completely discharged. At this point, close the shut-off valve 77. The residual paraffin oil in the settling tank 7 can be removed and returned to the heat exchange oil tank 3 and the relay tank to prepare for the next batch of sodium transport. Therefore, the sodium storage tank 1 is connected to the sodium inlet pipeline 11 to facilitate the batch transport of liquid sodium. Furthermore, paraffin oil has a melting point of approximately 5°C. In cold winter weather, residual paraffin oil in the pipeline may solidify and needs to be removed in advance. To better clean the paraffin oil in the pipeline, the sodium storage tank 1 has an air inlet pipeline 12 to pump inert gas into the system and discharge residual paraffin oil.

[0028] The main advantages of this embodiment are as follows: First, the pumping power mainly comes from the energy generated by the base temperature of electrolytic sodium, saving energy and reducing costs. Second, the heat tracing also partially comes from the heat generated by the base temperature of electrolytic sodium, reducing energy consumption. Third, the confluence pipe 4 can accelerate oil and gas transportation, accelerate the delivery of heat to distant locations, preheat distant pipelines, and reduce thermal shock. Fourth, the oil vapor in the heat exchange oil tank 3 can perform a self-purifying function, i.e., the system has a built-in purging function, preventing residual sodium in the pipelines. Fifth, the delivery pipe 6 avoids the use of electric heating devices, instead using a mixture of sodium and oil for transportation, resulting in high heat exchange efficiency, reduced heat consumption, and long transportation distance. Sixth, the delivery pipe 6 has no connecting wires or electric heating devices, resulting in a low failure rate, long service life, and easy high-altitude installation and maintenance.

[0029] In summary, this system utilizes the high-temperature energy of electrolytic sodium to avoid heat waste, thereby reducing energy consumption and costs for long-distance transport of liquid sodium. It also features a built-in purging function to prevent residual sodium in the pipeline, improving transport safety and facilitating maintenance.

[0030] The parts of this invention not described in detail are prior art; for those skilled in the art, the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. The scope of this invention is defined by the appended claims and their equivalents.

Claims

1. A liquid sodium remote transfer system comprising a sodium storage tank (1) and a sodium collection tank (2) located at the transfer end and the receiving end, respectively; characterized in that: The bottom pipeline of the sodium storage tank (1) is communicated with the coil (31) in the heat exchange oil tank (3), the heat exchange oil tank (3) has heat exchange medium, the bottom is provided with the fourth heating device (32), the upper portion is provided with the backflow pipe (33) and the exhaust pipe (34); the end of the backflow pipe (33) is communicated with the top of the sodium storage tank (1), the other end of the exhaust pipe (34) and the other end of the coil (31) are communicated with the confluence pipe (4); the other end of the confluence pipe (4) is communicated with the upper portion of the first relay tank (5), the first relay tank (5) is provided with the first heating device (51), the discharge port at the lower end is connected with the conveying pipe (6), the other end of the conveying pipe (6) is communicated with the top of the precipitation tank (7) at the receiving end; The bottom of the precipitation tank (7) is provided with a sodium discharge port (71), the sodium collection tank (2) is located below the precipitation tank (7) and is communicated with the sodium discharge port (71) through a pipeline; the sodium discharge port (71) is blocked from the inside of the precipitation tank (7) by a plug (91), the upper end of the plug (91) is connected with a pull rope (92), the upper end of the pull rope (92) is connected with a specific gravity float ball (9); the specific gravity float ball (9), the pull rope (92) and the plug (91) form a float ball mechanism; the liquid density of the heat exchange medium is less than the density of liquid sodium metal, and the overall density of the float ball mechanism is between the density of the heat exchange medium and the density of liquid sodium metal; The heat exchange medium is a liquid substance that does not react with sodium metal, and the boiling point is greater than the melting point of sodium metal.

2. The liquid sodium remote delivery system of claim 1, wherein: The heat exchange medium is one of paraffin oil, dodecane, butyl ether, diethylene glycol diethyl ether.

3. The liquid sodium remote delivery system of claim 1, wherein: The confluence pipe (4) includes an upper pipe (41) and a lower pipe (42) arranged in an upper-lower manner; the upper pipe (41) and the lower pipe (42) are connected into an integral pipe fitting through a plurality of vertically arranged standpipes (43) distributed at intervals; the integral pipe fitting is wrapped with a heat preservation layer (44); the upper pipe (41) is connected with the exhaust pipe (34), and the lower pipe (42) is connected with the coil (31).

4. The liquid sodium remote delivery system of claim 1, wherein: A plurality of second relay tanks (8) are arranged on the conveying pipe (6); the second relay tank (8) is provided with a second heating device (81), a discharge port at the lower end, and an inlet at the upper portion; the discharge port of the front second relay tank (8) is connected with the inlet of the rear second relay tank (8) through the conveying pipe (6), and a plurality of the second relay tanks (8) are connected in series; the inlet of the frontmost second relay tank (8) is connected with the discharge port of the first relay tank (5) through the conveying pipe (6); and the discharge port of the last second relay tank (8) is connected with the precipitation tank (7) through the conveying pipe (6).

5. The liquid sodium remote delivery system of claim 4, wherein: An electric valve (82) is arranged on the conveying pipe (6) between two second relay tanks (8); a parallel pipe (83) is connected to the conveying pipe (6) at both ends of the electric valve (82), and a plunger pump (84) is arranged on the parallel pipe (83); and a pressure sensor is arranged on the conveying pipe (6) at the front end of the electric valve (82).

6. The liquid sodium remote delivery system of claim 1, wherein: The sediment tank (7) is provided with a third heating device (73) at the bottom.

7. The liquid sodium remote delivery system of claim 6, wherein: A pressure relief valve (74) is connected to the top of the sediment tank (7).

8. The liquid sodium remote delivery system of claim 7, wherein: There are multiple sediment tanks (7), and adjacent two sediment tanks (7) are connected by a communication pipe (75) at the upper part to connect multiple sediment tanks (7) in series; and the end of the conveying pipe (6) is connected to the top of the frontmost sediment tank (7).

9. The liquid sodium remote delivery system of claim 8, wherein: A drain pipe (76) is connected to the bottom of the sediment tank (7), and a stop valve (77) is arranged on the drain pipe (76).

10. The liquid sodium remote delivery system of claim 1, wherein: The sodium storage tank (1) is connected with a sodium inlet pipeline (11) and an air inlet pipeline (12).

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