Multi-channel high-voltage molten salt heater

Abstract

The invention relates to the technical field of heaters, in particular to a multi-channel high-voltage molten salt heater which comprises a molten salt furnace, a heating pipe and a conveying part, molten salt in a molten state is contained in the molten salt furnace, the conveying part is used for enabling the molten salt to circularly flow between the heating pipe and the molten salt furnace, and the heating pipe comprises an outer pipe and a conductive electrode. The conductive electrodes are arranged at the two ends of the outer pipe and used for being connected with a live wire or a zero wire, a plurality of heating columns are detachably arranged in the portion, between the two conductive electrodes, of the outer pipe and distributed in the axis direction of the outer pipe, and the circumferential outer side walls of the heating columns are tightly attached to the circumferential inner side wall of the outer pipe. The heating columns and the outer pipe are made of heat conduction insulating ceramic materials, a plurality of medium channels are formed in the two ends, in the axis direction of the outer pipe, of each heating column, a distance piece used for controlling the distance is arranged between every two adjacent heating columns, and positioning pieces used for fixing the heating columns are arranged on the outer pipe. The device has the effects of long continuous working time and low maintenance cost.

Description

Technical Field

[0001] This application relates to the technical field of heaters, and particularly to a multi-channel high-voltage molten salt heater. Background Art

[0002] A heater is a device that achieves a heating effect through energy conversion, and its core function is to convert electrical energy or other forms of energy into heat energy. Such devices are widely used in modern life, for example, for heating water, air, or other media.

[0003] Chinese Patent with Publication No. CN219269105U discloses a heating tube, which includes a heating tube body. The heating tube body includes a first tube body and a second end tube body. Both the first end tube body and the second end tube body are wavy. The heating tube body has a heating wire, a sleeve, and a metal tube. The sleeve is sleeved on the heating wire, and the heating wire is a nickel-chromium alloy heating wire.

[0004] During the use of the above technology, by bending the heating tube body, the effect of increasing the heating area per unit length is achieved, thereby improving the heating effect of the heating tube. However, in the above technology, after long-term use of the heating wire, the heating wire will be melted, and due to the bent shape of the heating tube body, it is very difficult for workers to replace the heating wire. Therefore, after the heating wire is damaged, workers can only replace the entire heating tube, which increases the replacement cost of the heating tube and has deficiencies. Summary of the Invention

[0005] In order to improve the problem that the replacement cost of the heating tube is likely to increase during long-term use, this application provides a multi-channel high-voltage molten salt heater.

[0006] The multi-channel high-voltage molten salt heater provided by this application adopts the following technical solutions: A multi-channel high-voltage molten salt heater includes a molten salt furnace, a heating tube, and a conveying member. The molten salt furnace contains molten salt in a molten state. The conveying member is used to circulate the molten salt between the heating tube and the molten salt furnace. The heating tube includes an outer tube and conductive electrodes. The conductive electrodes are arranged at both ends of the outer tube. The conductive electrodes are used to connect to the live wire or the neutral wire. A plurality of heating columns are detachably arranged in the outer tube between the two conductive electrodes. The plurality of heating columns are arranged along the axial direction of the outer tube. The circumferential outer wall of the heating column is in close contact with the circumferential inner wall of the outer tube. Both the heating column and the outer tube are made of thermally conductive insulating ceramic materials. A plurality of medium channels are opened at both ends of the heating column along the axial direction of the outer tube. A spacer for controlling the spacing is arranged between adjacent two heating columns. A positioning member for fixing the heating column is arranged on the outer tube.

[0007] By adopting the above technical solution, the worker fixes the heating column on the outer tube through the spacer and the positioning member, then connects one of the conductive electrodes at both ends of the outer tube to the live wire and the other to the neutral wire. After that, the conveying member enables the molten salt in the molten state in the molten salt furnace to circulate between the heating tube and the molten salt furnace. During the process that the molten salt in the molten state flows in the medium channel in the heating column, since the molten salt in the molten state can conduct electricity and has resistance itself, the high voltage between the two conductive electrodes will cause the molten salt in the molten state in the outer tube to heat itself and continue to heat up, so that the heating column and the outer tube can heat up externally. During this process, since the heating column and the outer tube made of ceramics have less wear during high-temperature use, the maintenance frequency is reduced. And because the molten salt in the molten state is always in a flowing state, the problem of flow interruption will not occur. Therefore, the heating tube can be used for a long time continuously, and the maintenance and replacement cost of the heating tube is reduced.

[0008] Optionally, the spacer includes a partition sleeve disposed between two adjacent heating columns. The partition sleeve is made of a heat-conducting and insulating ceramic material, and annular grooves for inserting the partition sleeve are formed at both ends of the heating column.

[0009] By adopting the above technical solution, the partition sleeve separates two adjacent heating columns, reducing the possibility that the medium channel is blocked due to the misalignment of two adjacent heating columns. At the same time, the partition sleeve makes the space between two adjacent heating columns form an equipotential cavity, which will not affect the heating effect of the molten salt in the molten state.

[0010] Optionally, the positioning member includes electrode connection pipes detachably disposed at both ends of the outer tube. An electrode plate connected to the conductive electrode is arranged inside the electrode connection pipe. A fine-tuning sleeve is propped between the electrode plate and the heating column. Plate holes for the molten salt to flow through are formed on the electrode plate. A clamping groove is formed at the end of the outer tube, and a C-shaped clamping spring is clamped on the clamping groove of the outer tube. An end fixing plate is coaxially sleeved on the outer tube on the side of the C-shaped clamping spring facing away from the electrode connection pipe. A fixing tube is coaxially arranged on the end fixing plate, and the fixing tube is in threaded fit with the electrode connection pipe.

[0011] By adopting the above technical solution, after the heating column and the partition sleeve are installed in the outer tube, the worker installs the fine-tuning sleeve according to the length of the outer tube, then sleeves the electrode connection pipe on the end of the outer tube, and finally threads the fixing tube and the electrode connection pipe together to achieve the fixing effect on the heating column.

[0012] Optionally, the medium channel spirally winds around the axis of the heating column in the heating column, and a plurality of the medium channels are circumferentially distributed along the axis of the heating column.

[0013] By adopting the above technical solution, the spiral shape increases the length of the medium channel in the heating column, thereby increasing the resistance when the molten salt flows through the medium channel, so as to improve the adaptability of the heating tube to high voltage, and at the same time, it can improve the heating power of the molten salt at a single heating column.

[0014] Optionally, several of the medium channels are arranged in multiple layers in the radial direction of the heating column axis, and the lengths of the multiple medium channels on the heating column are equal.

[0015] By adopting the above technical solution, the resistance corresponding to the molten salt flowing through the medium channel on a single heating column is further increased. At the same time, the same length of all the medium channels can ensure that the pressure drop is equal when the molten salt flows through the medium channel, further enabling the heating tube to adapt to a higher voltage.

[0016] Optionally, the two outer tubes are coaxially arranged, and the conductive electrodes between the two outer tubes are used to connect to the live wire, and the conductive electrodes at the opposite ends of the two outer tubes are used to connect to the neutral wire.

[0017] By adopting the above technical solution, it is beneficial to improve the heating power of the heating tube.

[0018] Optionally, a combined tube is sleeved outside the three outer tubes, the gap between the combined tube and the outer tube is filled with high-temperature mastic, the three conductive electrodes at one end of the combined tube are connected together, and the three conductive electrodes at the other end of the combined tube are used to connect to a three-phase power supply.

[0019] By adopting the above technical solution, the three heating tubes on the combined tube can be directly connected to a three-phase power supply, thereby forming a greater heating power, which is beneficial to increasing the upper limit of the temperature that the heating tube can heat. This operation is simple and the combination is convenient, which is beneficial to reducing the manufacturing cost of high-power heaters.

[0020] Optionally, the conveying member includes a molten salt pump electrically connected to the control system. The input end of the molten salt pump communicates with the bottom of the molten salt furnace, and a feed pipe is communicated between one end of the outer tube and the output end of the molten salt pump, and a return pipe is communicated between the other end of the outer tube and the top of the molten salt furnace.

[0021] By adopting the above technical solution, the control system starts the molten salt pump, and the molten salt pump inputs the molten molten salt in the molten salt furnace into the outer tube through the feed pipe, and then flows back to the molten salt furnace through the return pipe, so as to achieve the effect of circulating the molten salt between the outer tube and the molten salt furnace.

[0022] Optionally, a first control valve is provided on the reflux pipe, a second control valve is provided on the feedstock pipe, a spiral cleaning pipe is provided in the molten salt furnace, one end of the cleaning pipe extends from the bottom of the molten salt furnace to the outside of the molten salt furnace, and the other end of the cleaning pipe extends from the top of the molten salt furnace to the outside of the molten salt furnace. A blast pipe is connected between the reflux pipe between the outer pipe and the first control valve and the cleaning pipe. A third control valve and a blower are provided on the blast pipe. A slag discharge pipe is connected to the feedstock pipe between the outer pipe and the second control valve. A salt discharge tank is connected to the slag discharge pipe. A fourth control valve is provided between the slag discharge pipe and the salt discharge tank. A fifth control valve is provided on the blast pipe between the blower and the cleaning pipe. An air-cooling pipe is connected to the blast pipe between the blower and the cleaning pipe. A sixth control valve is provided on the air-cooling pipe. The first control valve, the second control valve, the third control valve, the fourth control valve, the fifth control valve, the sixth control valve and the blower are all electrically connected to a control system.

[0023] By adopting the above technical solution, when the heating pipe needs to be repaired by workers after long-term use, the workers close the first control valve, the second control valve and the sixth control valve through the control system, open the third control valve, the fourth control valve, the fifth control valve and the blower. The blower draws outside air into the cleaning pipe. The air in the cleaning pipe is heated by the high temperature in the molten salt furnace. The heated hot air is blown into the outer pipe through the blast pipe. The residual molten salt in the outer pipe is discharged into the salt discharge tank through the slag discharge pipe under the action of the hot air, so as to realize the function of cleaning the outer pipe. After a period of time, the worker changes the air flow rate of the fifth control valve and gradually opens the sixth control valve, so that the temperature of the air flowing into the heating pipe gradually decreases. Until after a period of time, the fifth control valve is completely closed and the sixth control valve is completely opened. After a period of time, when the heating pipe is completely cooled, the worker can disassemble the heating pipe and perform maintenance and replacement.

[0024] Optionally, heat insulation layers are sleeved on the slag discharge pipe, the feedstock pipe and the reflux pipe.

[0025] By adopting the above technical solution, the possibility of the molten salt solidifying during the flow is reduced.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. Workers fix the heating column on the outer tube through spacers and positioning parts, then connect one of the conductive electrodes at both ends of the outer tube to the live wire and the other to the neutral wire. After that, the conveying part enables the molten salt in the molten salt furnace to circulate between the heating tube and the molten salt furnace. During the process of the molten salt in the molten state flowing in the medium channel inside the heating column, since the molten salt in the molten state can conduct electricity and has its own resistance, the high voltage between the two conductive electrodes will cause the molten salt in the outer tube to heat itself and continue to heat up, so that the heating column and the outer tube can heat up externally. During this process, because the heating column and the outer tube made of ceramics have less wear during high-temperature use, the maintenance frequency is reduced. And because the molten salt in the molten state is always in a flowing state, there will be no problem of interrupted flow. Therefore, the heating tube can be used continuously for a long time, reducing the maintenance and replacement cost of the heating tube; 2. The spiral shape will increase the length of the medium channel inside the heating column, thereby increasing the resistance when the molten salt flows through the medium channel, so as to improve the adaptability of the heating tube to high voltage, and at the same time, it can improve the heating power of the molten salt at a single heating column; 3. When the heating tube needs to be maintained after long-term use, the worker closes the first control valve, the second control valve and the sixth control valve through the control system, and opens the third control valve, the fourth control valve, the fifth control valve and the blower. The blower pumps the outside air into the cleaning tube. The air in the cleaning tube is heated by the high temperature in the molten salt furnace, and the heated hot air is blown into the outer tube through the air duct. The residual molten salt in the outer tube is discharged into the salt discharge box through the slag discharge pipe under the action of the hot air, so as to achieve the function of cleaning the outer tube. After a period of time, the worker changes the air flow rate of the fifth control valve and gradually opens the sixth control valve, so that the temperature of the air flowing into the heating tube gradually decreases. Until after a period of time, the fifth control valve is completely closed and the sixth control valve is completely opened. After a period of time, when the heating tube is completely cooled, the worker can disassemble the heating tube and carry out maintenance and replacement. Description of the Drawings

[0027] Figure 1 is the structural schematic diagram of the embodiment of the present application.

[0028] Figure 2 is the cross-sectional view for reflecting the positional relationship between the outer tube, the electrode plate and the heating column in the embodiment of the present application.

[0029] Figure 3 is the structural schematic diagram for reflecting the positional relationship between the heating column and the medium channel in the embodiment of the present application.

[0030] Figure 4 is the structural schematic diagram for reflecting the positional relationship between the combined tube and the high-temperature refractory mortar in the embodiment of the present application.

[0031] Explanation of the accompanying drawings: 1. molten salt furnace; 2. heating tube; 21. outer tube; 22. conductive electrode; 23. heating column; 24. medium channel; 3. conveying member; 31. molten salt pump; 32. quality inlet pipe; 33. reflux pipe; 4. spacer; 41. separator sleeve; 42. ring groove; 5. positioning member; 51. electrode pipe; 52. electrode plate; 53. fine-tuning sleeve; 54. plate hole; 55. slot; 56. C-shaped retaining ring; 57. end fixing plate; 58. fixing pipe; 6. combined pipe; 7. high-temperature mortar; 8. first control valve; 9. second control valve; 10. cleaning pipe; 11. blast pipe; 12. third control valve; 13. fan; 14. slag discharge pipe; 15. salt discharge box; 16. fourth control valve; 17. fifth control valve; 18. air cooling pipe; 19. sixth control valve; 20. insulation layer. DETAILED DESCRIPTION

[0032] The following is combined with Figures 1-4 This application is described in further detail.

[0033] The embodiment of the present application discloses a multi-channel high-voltage molten salt heater.

[0034] Reference Figure 1 A multi-channel high-voltage molten salt heater includes a molten salt furnace 1, a heating tube 2 and a conveying member 3. The molten salt furnace 1 contains molten salt in a molten state. The molten salt furnace 1 is used to maintain the molten salt in a molten state. The conveying member 3 is used to circulate the molten salt between the heating tube 2 and the molten salt furnace 1.

[0035] Reference Figure 1 The conveying member 3 includes a molten salt pump 31 electrically connected to the control system. The input end of the molten salt pump 31 is connected to the bottom of the molten salt furnace 1. An inlet pipe 32 is connected between one end of the outer tube 21 and the output end of the molten salt pump 31. A reflux pipe 33 is connected between the other end of the outer tube 21 and the top of the molten salt furnace 1.

[0036] Reference Figure 1 A first control valve 8 is bolted to the reflux pipe 33, a second control valve 9 is bolted to the quality inlet pipe 32, and a spiral cleaning pipe 10 is arranged around the axis of the molten salt furnace 1 in the molten salt furnace 1, one end of the cleaning pipe 10 extends from the bottom of the molten salt furnace 1 to the outside of the molten salt furnace 1, and the other end of the cleaning pipe 10 extends from the top of the molten salt furnace 1 to the outside of the molten salt furnace 1.

[0037] Reference Figure 1 A blast pipe 11 is connected between the return pipe 33 between the outer pipe 21 and the first control valve 8 and the cleaning pipe 10, and a third control valve 12 and a fan 13 are bolted to the blast pipe 11. A slag discharge pipe 14 is connected to the quality inlet pipe 32 between the outer pipe 21 and the second control valve 9.

[0038] Reference Figure 1, a salt discharge tank 15 is connected to the slag discharge pipe 14, and an exhaust gas treatment device (not shown in the figure) is connected to the salt discharge tank 15. A fourth control valve 16 is bolted between the slag discharge pipe 14 and the salt discharge tank 15, and a fifth control valve 17 is bolted on the air delivery pipe 11 between the blower 13 and the cleaning pipe 10.

[0039] Refer to Figure 1 , an air-cooled pipe 18 is connected to the air delivery pipe 11 between the blower 13 and the cleaning pipe 10. A sixth control valve 19 is bolted on the air-cooled pipe 18. The first control valve 8, the second control valve 9, the third control valve 12, the fourth control valve 16, the fifth control valve 17, the sixth control valve 19 and the blower 13 are all electrically connected to the control system. Heat insulation layers 20 are sleeved on the slag discharge pipe 14, the feed pipe 32 and the return pipe 33.

[0040] After the worker installs the heating pipe 2 between the feed pipe 32 and the return pipe 33, the control system starts the molten salt pump 31, the first control valve 8 and the second control valve 9, and closes the third control valve 12, the fourth control valve 16 and the fifth control valve 17. The molten salt in the molten salt furnace 1 circulates in the order of the molten salt pump 31, the feed pipe 32, the heating pipe 2 and the return pipe 33.

[0041] Refer to Figure 2 , the heating pipe 2 includes an outer pipe 21 and conductive electrodes 22. The conductive electrodes 22 are arranged at both ends of the outer pipe 21. The conductive electrodes 22 are used to connect to the live wire or the neutral wire. A plurality of heating columns 23 are inserted into the outer pipe 21 between the two conductive electrodes 22, and the plurality of heating columns 23 are arranged along the axial direction of the outer pipe 21.

[0042] Refer to Figure 2 and Figure 3 , the circumferential outer wall of the heating column 23 is in close contact with the circumferential inner wall of the outer pipe 21. Both the heating column 23 and the outer pipe 21 are made of heat-conducting insulating ceramic materials. A plurality of medium channels 24 are opened at both ends of the heating column 23 along the axial direction of the outer pipe 21.

[0043] Refer to Figure 3 , the medium channels 24 are spiral around the axis of the heating column 23 in the heating column 23. A plurality of medium channels 24 are circumferentially distributed along the axis of the heating column 23. A plurality of layers are arranged in the radial direction of the axis of the heating column 23 for the plurality of medium channels 24, and the lengths of the plurality of medium channels 24 on the heating column 23 are all equal.

[0044] Refer to Figure 2 , a spacer 4 for controlling the spacing is arranged between two adjacent heating columns 23. The spacer 4 includes a partition sleeve 41 arranged between two adjacent heating columns 23. The partition sleeve 41 is made of heat-conducting insulating ceramic materials. Circular grooves 42 for inserting the partition sleeve 41 are opened at both ends of the heating column 23. Refer to Figure 2, a positioning member 5 for fixing the heating column 23 is arranged on the outer tube 21. The positioning member 5 includes electrode connecting pipes 51 inserted into both ends of the outer tube 21. An electrode plate 52 connected to the conductive electrode 22 is welded inside the electrode connecting pipes 51. A fine-tuning sleeve 53 is propped between the electrode plate 52 and the heating column 23. Plate holes 54 for the molten salt to flow through are formed on the electrode plate 52.

[0045] Referring to Figure 2 , a clamping groove 55 is formed at the end of the outer tube 21. A C-shaped clamping spring 56 is clamped on the clamping groove 55 of the outer tube 21. An end fixing plate 57 is coaxially and slidably sleeved on the outer tube 21 on the side of the C-shaped clamping spring 56 facing away from the electrode connecting pipe 51. A fixing pipe 58 is coaxially welded on the end fixing plate 57, and the fixing pipe 58 is in threaded fit with the electrode connecting pipe 51.

[0046] After the molten salt in the inlet pipe 32 flows into the outer tube 21, the molten salt will gradually flow along the medium channel 24 on the heating column 23. During this process, an external power supply applies a high voltage to the conductive electrode 22. The molten salt flowing in the outer tube 21 forms an equipotential between two adjacent heating columns 23. The spiral medium channel 24 will increase the resistance of the molten salt when flowing through the heating column 23, so that the temperature of the heating column 23 keeps rising. Finally, the heat diffuses from the heating column 23 to the outside of the outer tube 21 by means of heat transfer, thereby realizing the effect of heating the object by the heating tube 2.

[0047] When the heating tube 2 needs to be repaired, the worker closes the molten salt pump 31, the first control valve 8, the second control valve 9 and the sixth control valve 19 through the control system, and opens the third control valve 12, the fourth control valve 16, the fifth control valve 17 and the blower 13. The blower 13 pumps the outside air into the cleaning pipe 10. The air in the cleaning pipe 10 will be heated by the high temperature in the molten salt furnace 1, and the heated hot air is blown into the outer tube 21 through the air duct 11.

[0048] The molten salt remaining between two adjacent heating columns 23 and in the medium channel 24 of the heating column 23 is discharged into the salt discharge box 15 through the slag discharge pipe 14 under the action of the hot air. The waste gas entering the salt discharge box 15 will be treated by the tail gas treatment equipment and then discharged to the atmosphere. This process lasts for a period of time according to experience, so as to realize the effect of cleaning the residual molten salt in the outer tube 21.

[0049] After that, the worker gradually reduces the air flow rate of the fifth control valve 17 through the control system and gradually opens the sixth control valve 19, so that the temperature of the mixed air flowing into the heating tube 2 gradually decreases. After a period of time, the temperature of the outer tube 21 gradually drops. Finally, the fifth control valve 17 is completely closed, and at the same time, the sixth control valve 19 is completely opened, so that the air at the natural temperature flows into the outer tube 21. After a period of time, the heating tube 2 is completely cooled. The duration of this process is determined by the worker through the temperature measuring equipment.

[0050] After the worker removes the fully cooled heating tube 2, the worker loosens the fixing tube 58 to separate the fixing tube 58 from the electrode connection tube 51. Then the worker tilts the outer tube 21, and if necessary, uses a rubber hammer to slide the heating column 23 inside the outer tube 21 out of the outer tube 21. Then the worker replaces the severely worn heating column 23, thus realizing the maintenance and replacement process of the heating tube 2.

[0051] Refer to Figure 1 , the two outer tubes 21 are coaxially arranged. The conductive electrodes 22 between the two outer tubes 21 are used to connect the live wire, and the conductive electrodes 22 at the opposite ends of the two outer tubes 21 are used to connect the neutral wire.

[0052] Refer to Figure 4 , a combined tube 6 is sleeved outside the three outer tubes 21 together. The gap between the combined tube 6 and the outer tube 21 is filled with high-temperature mastic 7. The three conductive electrodes 22 at one end of the combined tube 6 are connected together, and the three conductive electrodes 22 at the other end of the combined tube 6 are used to connect to the three-phase power supply.

[0053] The worker can make a heating tube 2 with a larger heating power by connecting multiple outer tubes 21 in parallel and in series, which is beneficial to reducing the production cost of the high-power heating tube 2.

[0054] The implementation principle of a multi-channel high-voltage molten salt heater in an embodiment of this application is: Since the molten salt in a molten state can conduct electricity and has a certain resistance itself, the resistance is related to the composition of the molten salt. When a high voltage difference is applied to both ends of the flowing molten salt, the high voltage difference will cause the molten salt in a molten state to heat itself and achieve continuous temperature rise.

[0055] After the worker installs the heating tube 2 between the inlet pipe 32 and the return pipe 33, the control system starts the molten salt pump 31, the first control valve 8 and the second control valve 9, and closes the third control valve 12, the fourth control valve 16 and the fifth control valve 17. The molten salt in the molten salt furnace 1 circulates in the order of the molten salt pump 31, the inlet pipe 32, the heating tube 2 and the return pipe 33.

[0056] When the molten salt in the inlet pipe 32 flows into the outer tube 21, the molten salt will gradually flow along the medium channel 24 on the heating column 23. During this process, the external power supply applies a high voltage to the conductive electrode 22. The molten salt flowing in the outer tube 21 forms an equipotential between two adjacent heating columns 23. The spiral medium channel 24 will increase the resistance when the molten salt flows through the heating column 23, so that the temperature at the heating column 23 keeps rising. Through the way of heat transfer, finally the heat diffuses from the heating column 23 to the outside of the outer tube 21, thus realizing the heating effect of the heating tube 2 on an object.

[0057] When the heating pipe 2 needs to be repaired, the worker closes the molten salt pump 31, the first control valve 8, the second control valve 9 and the sixth control valve 19 through the control system, and opens the third control valve 12, the fourth control valve 16, the fifth control valve 17 and the blower 13. The blower 13 sucks the outside air into the cleaning pipe 10. The air in the cleaning pipe 10 will be heated by the high temperature in the molten salt furnace 1, and the heated hot air is blown into the outer pipe 21 through the air duct 11.

[0058] The molten salt remaining between two adjacent heating columns 23 and in the medium channel 24 of the heating column 23 is discharged into the salt discharge tank 15 through the slag discharge pipe 14 under the action of the hot air. The waste gas entering the salt discharge tank 15 will be treated by the tail gas treatment equipment and then discharged into the atmosphere. This process lasts for a period of time according to experience, so as to achieve the effect of cleaning the molten salt remaining in the outer pipe 21.

[0059] After that, the worker gradually reduces the ventilation flow rate of the fifth control valve 17 through the control system and gradually opens the sixth control valve 19, so that the temperature of the mixed air flowing into the heating pipe 2 gradually decreases. After a period of time, the temperature of the outer pipe 21 gradually drops. Finally, the fifth control valve 17 is completely closed, and at the same time, the sixth control valve 19 is completely opened, so that the air at the natural temperature flows into the outer pipe 21. After a period of time, the heating pipe 2 is completely cooled. The duration of this process is determined by the worker through the temperature measuring equipment.

[0060] After the worker disassembles the completely cooled heating pipe 2, the worker loosens the fixing pipe 58 to separate the fixing pipe 58 from the electrode connecting pipe 51. Then the worker tilts the outer pipe 21. If necessary, a rubber hammer can be used to make the heating column 23 in the outer pipe 21 slide out of the outer pipe 21. Then the worker can replace the severely worn heating column 23, so as to realize the repair and replacement process of the heating pipe 2.

[0061] The worker can make a heating pipe 2 with a larger heating power by connecting multiple outer pipes 21 in parallel and in series, which is beneficial to reducing the production cost of the high-power heating pipe 2.

[0062] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of this application should be covered within the protection scope of this application.

Claims

1. A multi-channel high-voltage molten salt heater, characterized in that: It includes a molten salt furnace (1), heating tubes (2) and a conveying member (3). The molten salt furnace (1) is filled with molten salt in a molten state. The conveying member (3) is used to circulate the molten salt between the heating tubes (2) and the molten salt furnace (1). The heating tube (2) includes an outer tube (21) and conductive electrodes (22). The conductive electrodes (22) are arranged at both ends of the outer tube (21). The conductive electrodes (22) are used to connect to the live wire or the neutral wire. A plurality of heating columns (23) are detachably arranged in the outer tube (21) between the two conductive electrodes (22). The plurality of heating columns (23) are arranged along the axial direction of the outer tube (21). The circumferential outer wall of the heating column (23) is in close contact with the circumferential inner wall of the outer tube (21). Both the heating column (23) and the outer tube (21) are made of heat-conducting insulating ceramic materials. A plurality of medium channels (24) are opened at both ends of the heating column (23) along the axial direction of the outer tube (21). A spacer (4) for controlling the spacing is arranged between adjacent two heating columns (23). A positioning member (5) for fixing the heating column (23) is arranged on the outer tube (21).

2. The multi-channel high-voltage molten salt heater according to claim 1, characterized in that: The spacer (4) includes a separating sleeve (41) arranged between adjacent two heating columns (23). The separating sleeve (41) is made of heat-conducting insulating ceramic materials. Ring grooves (42) for inserting the separating sleeve (41) are opened at both ends of the heating column (23).

3. The multi-channel high-voltage molten salt heater according to claim 2, characterized in that: The positioning member (5) includes electrode connecting pipes (51) detachably arranged at both ends of the outer tube (21). Electrode plates (52) connected to the conductive electrodes (22) are arranged in the electrode connecting pipes (51). A fine-tuning sleeve (53) is propped between the electrode plate (52) and the heating column (23). Plate holes (54) for the molten salt to flow through are opened on the electrode plate (52). A clamping groove (55) is opened at the end of the outer tube (21). A C-shaped clamping spring (56) is clamped on the clamping groove (55) of the outer tube (21). An end fixing plate (57) is coaxially slidably sleeved on the outer tube (21) on the side of the C-shaped clamping spring (56) facing away from the electrode connecting pipe (51). A fixing tube (58) is coaxially arranged on the end fixing plate (57). The fixing tube (58) is in threaded cooperation with the electrode connecting pipe (51).

4. A multi-channel high-voltage molten salt heater according to claim 1, characterized in that: The medium channels (24) are spiral around the axis of the heating column (23) in the heating column (23). A plurality of the medium channels (24) are circumferentially distributed along the axis of the heating column (23).

5. The multi-channel high-voltage molten salt heater according to claim 4, wherein: A plurality of the medium channels (24) are arranged in multiple layers in the radial direction along the axis of the heating column (23). The lengths of the multiple layers of the medium channels (24) on the heating column (23) are all equal.

6. The multi-channel high-voltage molten salt heater according to claim 3, characterized in that: The two outer tubes (21) are coaxially arranged. The conductive electrodes (22) between the two outer tubes (21) are used to connect to the live wire. The conductive electrodes (22) at the opposite ends of the two outer tubes (21) are used to connect to the neutral wire.

7. A multi-channel high-voltage molten salt heater according to claim 6, characterized in that: A combined pipe (6) is sleeved outside the three outer pipes (21). The gap between the combined pipe (6) and the outer pipes (21) is filled with high-temperature refractory mortar (7). The three conductive electrodes (22) at one end of the combined pipe (6) are connected together, and the three conductive electrodes (22) at the other end of the combined pipe (6) are used to connect to a three-phase power supply.

8. The multi-channel high-voltage molten salt heater according to claim 1, wherein: The conveying member (3) includes a molten salt pump (31) electrically connected to a control system. The input end of the molten salt pump (31) communicates with the bottom of the molten salt furnace (1). A feed pipe (32) is communicated between one end of the outer pipe (21) and the output end of the molten salt pump (31). A return pipe (33) is communicated between the other end of the outer pipe (21) and the top of the molten salt furnace (1).

9. The multi-channel high-voltage molten salt heater according to claim 8, wherein: A first control valve (8) is arranged on the return pipe (33). A second control valve (9) is arranged on the feed pipe (32). A spiral cleaning pipe (10) is arranged in the molten salt furnace (1). One end of the cleaning pipe (10) extends from the bottom of the molten salt furnace (1) to the outside of the molten salt furnace (1). The other end of the cleaning pipe (10) extends from the top of the molten salt furnace (1) to the outside of the molten salt furnace (1). A blast pipe (11) is communicated between the return pipe (33) between the outer pipe (21) and the first control valve (8) and the cleaning pipe (10). A third control valve (12) and a blower (13) are arranged on the blast pipe (11). A slag discharge pipe (14) is communicated with the feed pipe (32) between the outer pipe (21) and the second control valve (9). A slag discharge tank (15) is communicated with the slag discharge pipe (14). A fourth control valve (16) is arranged between the slag discharge pipe (14) and the slag discharge tank (15). A fifth control valve (17) is arranged on the blast pipe (11) between the blower (13) and the cleaning pipe (10). An air-cooling pipe (18) is communicated with the blast pipe (11) between the blower (13) and the cleaning pipe (10). A sixth control valve (19) is arranged on the air-cooling pipe (18). The first control valve (8), the second control valve (9), the third control valve (12), the fourth control valve (16), the fifth control valve (17), the sixth control valve (19) and the blower (13) are all electrically connected to the control system.

10. A multi-channel high-voltage molten salt heater according to claim 9, characterized in that: Heat insulation layers (20) are sleeved on the slag discharge pipe (14), the feed pipe (32) and the return pipe (33).

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