CN217005475U - Device for heating molten salt - Google Patents

Abstract

The application relates to the field of electric heating and thermal energy storage technologies, and discloses a device for heating molten salt, which comprises a salt solution pool, an electrode insulating tube, a phase electrode, a zero electrode and a power supply connected with the phase electrode and the zero electrode, wherein the salt solution pool is filled with the molten salt; the electrode insulating tube is a pipeline made of insulating materials with openings at two ends, one end of the electrode insulating tube is positioned at the lower position of the salt liquid pool, and the other end of the electrode insulating tube is higher than the molten salt liquid level in the salt liquid pool; the insertion end of the phase electrode is inserted into the electrode insulating tube and is in contact with the molten salt in the electrode insulating tube; the wiring end of the phase electrode is connected with a phase line wiring terminal of the power supply device; the inserting end of the zero electrode is inserted into the salt liquid pool to contact with the molten salt, and the wiring end of the zero electrode is connected with a zero line wiring terminal of the power supply device. The molten salt heating device has the advantages of effectively improving the effects of large volume, high cost, high energy consumption and high failure rate of the conventional molten salt heating device.

Description

Device for heating molten salt

Technical Field

The application relates to the field of electric heating and heat energy storage technologies, in particular to a device for heating molten salt.

Background

With the implementation of the Chinese double-carbon strategy, the proportion of new energy power generation in an energy system is continuously increased, and the new energy power generation has the characteristics of high volatility, strong randomness and incapability of generating power randomly. The main method for solving the problem is an energy storage technology, one of which is a molten salt heat storage technology and is widely applied to photo-thermal power generation.

In the related technology, the electrode type molten salt heating method is that current directly passes through molten salt to generate heat, the molten salt is a heating body, and the problem caused by indirect heating is avoided. Electrode formula fused salt heating method can set up two salt solution ponds that have the difference in height about usually, set up the fused salt pump in the salt solution pond of below, the fused salt pump will preheat the fused salt that reaches the molten condition and take out to the salt solution pond of below in the salt solution pond, fused salt in the salt solution pond of top can pass through electrode insulation pipeline and get into the fused salt electrode case that sets up between two salt solution ponds, then in the salt solution pond of below is flowed to by the fused salt electrode case again, with this formation circulation, the in-process of circulation, turn on the power, thereby make the fused salt heated.

In view of the above-mentioned related art, the inventor thinks that the existing molten salt heating device needs to be provided with a plurality of molten salt ponds and molten salt electrode boxes, and still needs to set up many baffles communicating pipe between each box, in order to make the circulation can naturally flow, communicating pipe needs vertical installation, has increased the cost, volume, energy consumption, and the fault rate of whole device.

SUMMERY OF THE UTILITY MODEL

In order to effectively improve the problem that current fused salt heating device volume is great, cost, energy consumption to and the fault rate is higher, the application provides a device for heating fused salt.

The application provides a device for heating fused salt adopts following technical scheme:

a device for heating molten salt comprises a molten salt pool, an electrode insulating tube, a phase electrode, a zero electrode and a power supply connected with the phase electrode and the zero electrode, wherein the molten salt is contained in the molten salt pool;

the electrode insulating tube is a pipeline made of insulating materials with openings at two ends, one end of the electrode insulating tube is positioned at the lower position of the salt liquid pool, and the other end of the electrode insulating tube is higher than the molten salt liquid level in the salt liquid pool; the insertion end of the phase electrode is inserted into the electrode insulating tube and is in contact with the molten salt in the electrode insulating tube; the wiring end of the phase electrode is connected with a phase line wiring terminal of the power supply device; the inserting end of the zero electrode is inserted into the salt liquid pool to contact with the molten salt, and the wiring end of the zero electrode is connected with a zero line wiring terminal of the power supply device.

By adopting the technical scheme, when the phase electrode and the zero motor are connected with a power supply, current can be formed in the electrode insulating tube, the fused salt in the electrode insulating tube can generate heat due to self resistance, the temperature is increased, and heat transfer temperature difference is generated between the inside and the outside of the tube, so that the generated heat is transferred to the fused salt outside the tube, the temperature of the fused salt outside the tube is increased, and the heat storage function of the fused salt is realized; after the power supply is switched on, current flows from the phase electrode to the zero electrode, heat is generated in the whole circulation link, but the heat is mainly generated in the electrode insulation tube, and because the resistance in the electrode insulation tube is far greater than other parts, conditions are created for realizing accurate and organized control of heating power; the heating part and the heat storage part of the device are completely integrated, and components such as a molten salt pump, a preheating electric heater and the like, a heat transmission device and a pipeline are not needed, so that the structure of the device is greatly simplified, the cost is reduced, the reliability is improved, and the size of the device is reduced. Because the electric heater is arranged in the molten salt heat storage medium, the problem that the whole device is difficult to restart even if the whole device is in a cold state for a long time and even the molten salt is solidified can not be caused, so that a series of technical measures (such as reinforced heat preservation measures) required for always keeping the molten salt in a liquid state in the traditional technical scheme are avoided, and the heat loss in the cold state process is reduced.

Optionally, the stirring device further comprises a motor, a transmission shaft mounted on the motor, and an impeller mounted on the transmission shaft.

By adopting the technical scheme, the molten salt in the salt solution pool has natural ascending motion after the heated temperature rises, so that the heat transfer performance is improved, the device can increase the flow speed of the molten salt, thereby enhancing the heat transfer, and in addition, the stirring device is also beneficial to improving the control of the heat release amount in the heat release process; meanwhile, the stirring device effectively improves the heat transfer capacity of the molten salt, so that the total cost of the device can be effectively reduced by adopting a mode of shortening the length of the electrode insulating tube and reducing the diameter of the electrode insulating tube.

Optionally, the phase electrode includes a phase electrode conductor, a phase electrode fixing member is sleeved on the phase electrode conductor, one end of the phase electrode conductor is a phase electrode terminal, the other end of the phase electrode conductor is an insertion end, the electrode insulating tube is tightly connected with the phase electrode fixing member, and the zero electrode is consistent with the phase electrode in structure.

Through adopting above-mentioned technical scheme, the electrode mounting can support looks electrode conductor, the placing of the looks electrode of being convenient for.

Optionally, the electrode insulating tube is made of a thin-walled steel tube with an insulating layer attached to the inner surface.

By adopting the technical scheme, the thin-wall steel pipe has good heat transfer performance, the insulating layer can ensure the insulativity of the electrode insulating pipe, and the problem that a common insulating pipe has brittleness can be solved.

Optionally, the insulating layer is made of enamel or ceramic.

By adopting the technical scheme, the enamel or the ceramic is attached to the steel pipe, which belongs to the conventional process, and the production cost can be effectively reduced.

Optionally, a cover plate is arranged at the top of the salt solution tank, a flange is arranged at the top of the salt solution tank, and the cover plate and the flange are detachably connected through bolts.

Through adopting above-mentioned technical scheme, salt solution pond and outside connecting piece all can set up on the apron, and the dismouting of each part is all very convenient, and when needs each part whole to move, the apron is also convenient for wholly move each part on the apron, maintains interior parts.

Optionally, the flanging flange is arranged outside the salt solution tank.

Through adopting above-mentioned technical scheme, set up the turn-ups flange and make things convenient for the staff operation in the outside of salt solution pond, can effectively improve work efficiency.

Optionally, the electrode fixing part is made of an insulating material, and the electrode conductor is made of a material which has good electrical conductivity and is resistant to high temperature of molten salt and cannot be corroded by the molten salt.

In summary, the present application includes at least one of the following beneficial technical effects:

by arranging the salt solution pool, the electrode insulating tube, the phase electrode, the zero electrode and the power supply connected with the phase electrode and the zero electrode, the salt solution pool is filled with the fused salt, the heating part and the heat storage part of the device are completely integrated, and heat transmission devices and pipelines such as a fused salt pump and the like are not needed, so that the structure of the device is greatly simplified, the cost is reduced, the reliability is improved, and the volume of the device is reduced;

by arranging the stirring device which comprises the motor, the transmission shaft arranged on the motor and the impeller arranged on the transmission shaft, the flow speed of the molten salt can be increased, so that the heat transfer is enhanced;

the electrode insulating tube is made of the thin-wall steel tube with the insulating layer attached to the inner surface, so that the thin-wall steel tube is good in heat transfer performance, the insulating layer can guarantee the insulating performance of the electrode insulating tube, and the problem that a common insulating tube is fragile can be solved.

Drawings

Fig. 1 is a schematic structural view of an apparatus for heating molten salt.

Fig. 2 is a partial sectional view of an electrode insulation tube.

Fig. 3 is a schematic diagram of the structure of the phase electrode.

Fig. 4 is a schematic view of an elongated structure of an electrode insulating tube in an apparatus for heating molten salt.

Description of reference numerals: 1. a salt solution pool; 11. flanging a flange; 12. a cover plate; 2. melting a salt; 3. an electrode insulating tube; 31. an upper pipe end; 32. a lower pipe end; 33. a steel pipe; 34. an insulating layer; 4. a phase electrode; 41. a phase electrode terminal; 42. a phase electrode fixing member; 43. a phase electrode conductor; 44. a phase electrode insertion end; 5. a zero electrode; 6. a power source; 7. a stirring device; 71. a motor; 72. a drive shaft; 73. an impeller.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses a device for heating fused salt.

Referring to fig. 1, an apparatus for heating molten salt includes a molten salt bath 1, molten salt 2 contained in the molten salt bath 1, an electrode insulating tube 3, a phase electrode 4, a zero electrode 5, and a power supply 6 connected to the phase electrode 4 and the zero electrode 5. In the embodiment of the present application, the salt solution tank 1 is square or cylindrical, a flange 11 is disposed on the top of the salt solution tank 1, a cover plate 12 is disposed on the top of the salt solution tank 1, and the cover plate 12 is connected to the flange 11 on the top of the salt solution tank 1 by bolts (not shown in the figure) so as to be detached from the cover plate 12. Simultaneously, salt solution pond 1 and outside connecting piece all can set up on apron 12, and the dismouting of each part is all very convenient, and when needs each part whole to move, apron 12 also is convenient for move each part on the apron 12 wholly, and the convenience is maintained internal component.

With reference to fig. 1 and 2, both ends of the electrode insulation tube 3 have openings, both ends of the electrode insulation tube 3 are a lower tube end 32 and an upper tube end 31, respectively, the lower tube end 32 of the electrode insulation tube 3 is inserted into a lower position of the salt solution pool 1, and the upper tube end 31 of the electrode insulation tube 3 is higher than the liquid level of the molten salt 2 solution in the salt solution pool 1. The electrode insulating tube 3 is made of non-conducting materials or materials with weak conducting capacity, the electrode insulating tube 3 can be made of glass tubes, ceramic tubes and other materials, the glass tubes and the ceramic tubes are all easily available materials, the price is low, and the production cost can be effectively reduced.

In the embodiment of the application, the electrode insulating tube 3 is a thin-wall steel tube 33 with an insulating layer 34 attached to the inner surface, the insulating layer 34 can be made of enamel or ceramic, the process belongs to a conventional process, the production cost can be effectively reduced, and meanwhile, the steel tube 33 with the insulating layer 34 attached to the surface can not only effectively improve the heat transfer performance of the electrode insulating tube 3, but also solve the problem that a common insulating tube is fragile.

With reference to fig. 1 and 3, the phase electrode 4 includes a phase electrode conductor 43 and a phase electrode fixing member 42 sleeved on the phase electrode conductor 43, one end of the phase electrode conductor 43 is connected with a phase electrode terminal 41, an end of the phase electrode conductor 43 away from the terminal is an insertion end, the electrode insulating tube 3 is tightly connected with the phase electrode fixing member 42, and the phase electrode conductor 43 is made of a material having good electrical conductivity and high temperature resistance to molten salt, and is not corroded by molten salt. The phase electrode fixing piece 42 is T-shaped, the phase electrode fixing piece 42 is made of insulating materials, the phase electrode fixing piece 42 can support the phase electrode conductor 43, the phase electrode 4 is placed on the cover plate 12 of the salt solution pool 1 conveniently, and the zero electrode 5 and the phase electrode 4 are consistent in structure.

The inserting end of the phase electrode 4 is inserted into the electrode insulating tube 3, the inserting depth is guaranteed to be in contact with the molten salt 2 in the tube, the wiring terminal of the phase electrode 4 is connected with the phase line wiring terminal of the power supply 6, the inserting end of the zero electrode 5 is inserted into the salt liquid pool 1, the inserting depth is guaranteed to be in contact with the molten salt 2, and the wiring terminal of the zero electrode 5 is connected with the zero line wiring terminal of the power supply 6.

With reference to fig. 1 and 4, the electrode insulation tube 3 has a certain length and is non-conductive or weak in electrical conductivity, so that a necessary resistance can be established between the upper tube end 31 and the lower tube end 32 in the electrode insulation tube 3, and when a specific resistance is required, a worker can obtain the required resistance by adjusting the length and the diameter of the electrode insulation tube 3, so as to achieve the power required by the work, further achieve accurate and controllable power, and reduce waste of resources.

After the phase electrode 4 and the zero electrode 5 are connected with the power supply 6, current can be formed in the electrode insulating tube 3, the fused salt 2 in the electrode insulating tube 3 can generate heat due to self resistance, the temperature rises, and heat transfer temperature difference is generated between the inside and the outside of the tube, so that the generated heat can be transferred to the fused salt 2 outside the tube, the temperature of the fused salt 2 outside the tube also rises, and the function of storing heat of the fused salt 2 is realized.

Referring to fig. 1 and 4, after the power supply 6 is turned on, current flows from the phase electrode 4 to the zero electrode 5, and heat is generated in the whole circulation link, but the resistance in the electrode insulation tube 3 is much greater than that of other parts, so that the resistance in the electrode insulation tube 3 is much greater than that of other parts, and thus, a worker can control the heating power by controlling the length and the diameter of the electrode insulation tube 3.

In this device, heating part and heat storage part fuse completely, need not heat transmission device and connecting line such as molten salt pump, and consequently this device structure is simplified, and the volume is less, can effective reduce cost, and transmission device's reduction simultaneously to and connecting line's reduction can effectively improve the reliability of device.

Meanwhile, the insulating property of the electrode insulating tube 3 is good, so that the heat conductivity of the electrode insulating tube 3 is poor, and only a worker needs to select a large diameter and a long pipeline, so that the heat transfer area of the electrode insulating tube 3 is expanded, the heat transfer capacity of the electrode insulating tube 3 is improved, and the required resistance can be obtained or guaranteed.

Referring to fig. 1, the device for heating molten salt 2 further comprises a stirring device 7, wherein the stirring device 7 comprises a motor 71 installed on the molten salt pool 1, a transmission shaft 72 installed on the motor 71, and a plurality of impellers 73 installed on the transmission shaft 72, the plurality of impellers 73 are arranged at intervals along the axis of the transmission shaft 72, and the axis of the transmission shaft 72 is parallel to the straight line of the depth direction of the molten salt pool 1.

When the fused salt 2 in the salt solution pond 1 is heated, after the temperature rose, fused salt 2 can produce the ascending motion of nature to promote heat transfer performance, agitating unit 7 can promote the flow speed of fused salt 2, thereby further strengthen fused salt 2's heat transfer capacity, in addition, through the rotational speed of control agitating unit 7, still be favorable to promoting the controllability to the exothermal quantity among the exothermic process. Simultaneously, because agitating unit 7 has effectively promoted the heat transfer capacity of fused salt 2, consequently the staff can shorten the length of electrode insulating tube 3 to and reduce electrode insulating tube 3's diameter, and then effectively reduce the total cost of device.

In the present embodiment, a single-phase ac power is used, and a more-phase or less-phase ac power may be used.

The implementation principle of the device for heating molten salt in the embodiment of the application is as follows: after the phase electrode 4 and the zero electrode 5 are connected with the power supply 6, current is formed in the electrode insulating tube 3, the fused salt 2 in the electrode insulating tube 3 generates heat due to self resistance, the temperature rises, and heat transfer temperature difference is formed between the inside and the outside of the tube of the electrode insulating tube 3, so that the generated heat is transferred to the fused salt 2 outside the electrode insulating tube 3, the temperature of the fused salt 2 outside the electrode insulating tube 3 rises along with the temperature rise, and the function of heat storage of the fused salt 2 is achieved.

The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. An apparatus for heating molten salts, characterized in that: the device comprises a salt solution pool (1), an electrode insulating tube (3), a phase electrode (4), a zero electrode (5) and a power supply (6) connected with the phase electrode (4) and the zero electrode (5), wherein the salt solution pool (1) is filled with molten salt (2);

the electrode insulating tube (3) is a pipeline made of insulating materials with openings at two ends, one end of the electrode insulating tube (3) is positioned at the lower position of the salt liquid pool (1), and the other end of the electrode insulating tube is higher than the liquid level of the molten salt (2) in the salt liquid pool (1); the insertion end of the phase electrode (4) is inserted into the electrode insulating tube (3) and is in contact with the molten salt (2) in the electrode insulating tube (3); the wiring end of the phase electrode (4) is connected with a phase line wiring terminal of a power supply (6); the inserting end of the zero electrode (5) is inserted into the salt solution pool (1) to be contacted with the molten salt (2), and the wiring end of the zero electrode (5) is connected with a zero line wiring terminal of the power supply (6).

2. An apparatus for heating molten salt according to claim 1, characterized in that: the stirring device (7) comprises a motor (71), a transmission shaft (72) arranged on the motor (71), and an impeller (73) arranged on the transmission shaft (72).

3. An apparatus for heating molten salt according to claim 2, characterized in that: the phase electrode (4) comprises a phase electrode conductor (43), a phase electrode fixing piece (42) is sleeved on the phase electrode conductor (43), one end of the phase electrode conductor (43) is a phase electrode wiring terminal (41), the other end of the phase electrode conductor (43) is an insertion end, and the electrode insulating tube (3) is tightly connected with the phase electrode fixing piece (42).

4. An apparatus for heating molten salt according to claim 1, characterized in that: the electrode insulating pipe (3) is made of a thin-wall steel pipe (33) with an insulating layer (34) attached to the inner surface.

5. An apparatus for heating molten salt according to claim 4, characterized in that: the insulating layer (34) is made of enamel or ceramic.

6. An apparatus for heating molten salt according to claim 1, characterized in that: a cover plate (12) is arranged at the top of the salt solution pool (1); the top of the salt solution pool (1) is provided with a flange (11), and the cover plate (12) is detachably connected with the flange (11) through bolts.

7. An apparatus for heating molten salts according to claim 6, characterized in that: the flanging flange (11) is arranged outside the salt solution pool (1).

8. An apparatus for heating molten salt according to claim 3, characterized in that: the phase electrode fixing member (42) is an electrode fixing member made of an insulating material, and the phase electrode conductor (43) is an electrode conductor made of a material which has good electrical conductivity, is resistant to high temperature of molten salt and is not corroded by the molten salt.

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