A molten salt heat storage tank

Abstract

The present application discloses a molten salt heat storage tank, which relates to the technical field of heat storage equipment. It includes a base, a tank body arranged on the base, and a stirring device; a salt inlet is arranged at the top of the tank body, and a salt outlet is arranged at the bottom of the tank body; the stirring device includes a driving motor and a stirrer, the stirrer is rotatably connected inside the tank body, and the driving motor is arranged at the top of the tank body and drives the stirrer to rotate. In this application, a stirring device is arranged on the tank body. When storing heat, the driving motor is started, and the driving motor drives the stirrer to rotate, so that the molten salt in the tank body is evenly heated, effectively improving the heat storage capacity of the molten salt heat storage tank.

Description

Technical Field

[0001] This application relates to the technical field of heat storage equipment, and in particular to a molten salt heat storage tank. Background Art

[0002] Environmental issues have become a highly concerned topic, and the generation of new energy provides basic support for development. At present, molten salt is a relatively popular heat storage material in solar thermal power plants, and the technology of molten salt heat storage tanks is often used to store heat.

[0003] When the current molten salt heat storage tank stores heat, the molten salt inside the tank always remains in a relatively static state, resulting in uneven heating of the molten salt in the tank and low heat storage capacity.

[0004] Regarding the above related technologies, the inventor believes that there are defects in low heat storage capacity. Summary of the Invention

[0005] In order to improve the heat storage capacity of the heat storage tank, this application provides a molten salt heat storage tank.

[0006] The molten salt heat storage tank provided by this application adopts the following technical solutions:

[0007] A molten salt heat storage tank includes a base, a tank body arranged on the base, and a stirring device; an inlet for salt is arranged at the top of the tank body, and an outlet for salt is arranged at the bottom of the tank body; the stirring device includes a driving motor and a stirrer, the stirrer is rotatably connected inside the tank body, and the driving motor is arranged at the top of the tank body and drives the stirrer to rotate.

[0008] By adopting the above technical solutions, a stirring device is arranged on the tank body. When storing heat, the driving motor is started, and the driving motor drives the stirrer to rotate, so that the molten salt in the tank is heated evenly, effectively improving the heat storage capacity of the molten salt heat storage tank.

[0009] Preferably, it further includes an anti-impact salt transportation device, and the anti-impact salt transportation device includes a salt pump, a salt pipe, and a plurality of high-temperature solenoid valves; the salt pump is fixed outside the tank body, one end of the salt pipe is communicated with the output end of the salt pump, and the end of the salt pipe away from the salt pump extends into the tank body along the inlet for salt; a plurality of the high-temperature solenoid valves are all arranged on the salt pipe, and the plurality of high-temperature solenoid valves are arranged at intervals along the height direction of the tank body.

[0010] By adopting the above technical solutions, when transporting salt, each high-temperature solenoid valve is separately opened in sequence from bottom to top along the height direction of the tank body, greatly reducing the drop height of the molten salt when entering the tank body, effectively reducing the impact force on the tank body when adding molten salt, and prolonging the service life of the tank body.

[0011] Preferably, a serpentine tube with a hollow interior is arranged inside the tank body. A rotating shaft tube is fixedly connected and communicated with the serpentine tube. The serpentine tube is rotatably connected to the tank body through the rotating shaft tube, and the rotating shaft tube penetrates through the salt inlet. The driving motor can drive the rotating shaft tube and the serpentine tube to rotate simultaneously. The output end of the salt delivery pump is communicated with the rotating shaft tube, and a plurality of the high-temperature solenoid valves are arranged on the serpentine tube.

[0012] By adopting the above technical solution, by arranging the serpentine tube, both the stirring function of the stirrer in the stirring device and the salt delivery function of the salt delivery pipe in the anti-impact salt delivery device are realized. The stirrer and the salt delivery pipe are integrated, effectively increasing the stirring range of the stirrer in a fixed space and avoiding interference between the stirrer and the salt delivery pipe. And when molten salt is delivered into the tank body, while the driving motor drives the stirrer to rotate, the positions of the high-temperature solenoid valves are constantly changing, and the molten salt can enter the tank body from different positions, enabling the later-added molten salt to be fully mixed with the already-added molten salt, further improving the heat storage capacity and heat storage efficiency.

[0013] Preferably, the output end of the driving motor is coaxially and fixedly connected with a driving gear, and the rotating shaft tube is coaxially and fixedly connected with a driven gear, and the driving gear meshes with the driven gear.

[0014] By adopting the above technical solution, the driving motor drives the rotating shaft tube and the serpentine tube to rotate through the driving gear and the driven gear, avoiding the influence on the delivery of molten salt from the salt delivery pump into the serpentine tube when the output end of the driving motor is coaxially and fixedly connected with the rotating shaft tube.

[0015] Preferably, the tank body includes an inner cavity and an outer cavity which are independently arranged. The inner cavity is used for storing molten salt, and an electric heating device is arranged in the outer cavity.

[0016] By adopting the above technical solution, the tank body is divided into an inner cavity and an outer cavity, and an electric heating device is arranged in the outer cavity, which can effectively improve the heat preservation effect of the heat storage tank. And the inner cavity and the outer cavity are independent of each other, and the electric heating device does not affect other components. When the electric heating device fails, it is convenient for maintenance and replacement.

[0017] Preferably, a plurality of independent chambers are evenly arranged in the outer cavity. A protective door is installed on the top of each independent chamber, and the electric heating device is arranged in each independent chamber.

[0018] By adopting the above technical solution, a plurality of independent chambers are arranged in the outer chamber, a protective door is arranged at the top of each independent chamber, and an electric heating device is arranged in each independent chamber. When the plurality of electric heating devices operate simultaneously and a certain electric heating device fails, the electric heating device in the faulty area can be repaired and maintained targeted, avoiding the loss of the heating function after a failure when a single electric heating device is used.

[0019] Preferably, a sliding device is arranged on the side wall of the outer chamber close to the inner chamber, the sliding direction of the sliding device is arranged along the height direction of the tank body, and the electric heating device is arranged on the sliding device.

[0020] By adopting the above technical solution, a sliding device for driving the electric heating pipe to move along the height direction of the tank body is arranged in the outer chamber, which is convenient to take out the electric heating device from the tank body when the electric heating device fails, facilitating maintenance and detection.

[0021] Preferably, the electric heating device includes an electric heating pipe, and the electric heating pipe is arranged in a serpentine coil on the side wall of the outer chamber close to the inner chamber.

[0022] By adopting the above technical solution, the electric heating pipe is arranged in a serpentine shape, which can effectively improve the heating uniformity, and a longer heating pipeline can be laid in a fixed space, improving the heating and heat preservation effect.

[0023] Preferably, a space heat insulation coating heat preservation layer is arranged outside the tank body.

[0024] By adopting the above technical solution, the space heat insulation coating heat preservation layer can not only effectively reduce the heat dissipated from the storage tank to the outside, prevent heat conduction, but also effectively improve the acid and alkali resistance and corrosion resistance, reduce the limitation of environmental factors, and increase the scope of application.

[0025] Preferably, the base includes a 200mm fine sand leveling layer, a 20mm steel plate load-bearing layer and a 300mm refractory concrete layer arranged from bottom to top.

[0026] By adopting the above technical solution, the base adopts a fine sand leveling layer, a steel plate load-bearing layer and a refractory concrete layer arranged in sequence from bottom to top. This structure has strong load-bearing capacity and can effectively prevent the overall structure from settling, avoiding the occurrence of molten salt leakage accidents.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. A stirring device is arranged on the tank body. When storing heat, the driving motor is started, and the driving motor drives the stirrer to rotate, so that the molten salt in the tank body is heated evenly, effectively improving the heat storage capacity of the molten salt heat storage tank;

[0029] 2. By setting up the coiled pipe, the stirring function of the stirrer in the stirring device is realized, and at the same time, the salt conveying function of the salt conveying pipe in the anti-impact salt conveying device is realized. The stirrer and the salt conveying pipe are integrated, effectively increasing the stirring range of the stirrer within a fixed space and avoiding interference between the stirrer and the salt conveying pipe. When molten salt is conveyed into the tank body, while the driving motor drives the stirrer to rotate, the position of the high-temperature solenoid valve changes at all times, and the molten salt can enter the tank body from different positions, enabling the later-added molten salt to be fully mixed with the already-added molten salt, further improving the heat storage capacity and heat storage efficiency.

[0030] 3. By using a space thermal insulation coating insulation layer, it can not only effectively reduce the heat dissipated from the storage tank to the outside and prevent heat conduction, but also effectively improve the acid and alkali resistance and corrosion resistance, reduce the limitations of environmental factors, and increase the scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is the overall structural schematic diagram of the embodiment of the present application.

[0032] Figure 2 is the cross-sectional structural schematic diagram of the embodiment of the present application.

[0033] Figure 3 is the cross-sectional structural schematic diagram showing the inside of the tank body in the embodiment of the present application.

[0034] DESCRIPTION OF THE REFERENCE NUMERALS: 1. Tank body; 11. Inner cavity; 111. Salt inlet; 112. Salt outlet; 113. Salt outlet conduit; 12. Outer cavity; 121. Independent chamber; 2. Base; 3. Stirring device; 31. Driving motor; 32. Rotating shaft tube; 33. Driving gear; 34. Driven gear; 4. Anti-impact salt conveying device; 41. Salt pumping pump; 42. High-temperature solenoid valve; 51. Coiled pipe; 61. Electric heating pipe; 7. Sliding device; 71. Sliding track; 72. Support frame. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The following Figures 1-3 further describes the present application in detail.

[0036] The embodiment of the present application discloses a molten salt heat storage tank.

[0037] Embodiment

[0038] Referring to Figure 1 , a molten salt heat storage tank includes a tank body 1 and a base 2 that provides a supporting and stabilizing effect on the tank body 1. The tank body 1 stores molten salt for heat storage, and a stirring device 3 for stirring the molten salt inside the tank body 1 is further provided on the tank body 1.

[0039] The base 2 includes a 200 - mm fine sand leveling layer, a 20 - mm steel plate load - bearing layer, and a 300 - mm refractory concrete layer arranged successively from bottom to top. The tank body 1 is fixed on the 300 - mm refractory concrete layer. This structure has strong load - bearing capacity and can effectively prevent the overall structure from settling, avoiding the occurrence of molten salt leakage accidents.

[0040] Combined with Figure 1 and Figure 2 , the tank body 1 includes a coaxial and mutually independent inner cavity 11 and outer cavity 12. At the top of the inner cavity 11, there is a salt inlet 111. At the bottom side wall of the inner cavity 11, there is a salt outlet 112. At the position corresponding to the salt outlet 112, a salt outlet conduit 113 is fixedly connected. The salt outlet conduit 113 passes through the outer cavity 12 and extends to the outside of the tank body 1. A space - heat - insulating coating heat - preservation layer is sprayed on the outer side wall of the tank body 1, which can not only effectively reduce the heat dissipated from the storage tank to the outside, prevent heat conduction, but also effectively improve acid and alkali resistance and corrosion resistance, reduce the limitations of environmental factors, and increase the scope of application.

[0041] The stirring device 3 includes a driving motor 31 and a stirrer rotatably connected in the inner cavity 11. By driving the stirrer to rotate through the driving motor 31, the uniform mixing of the molten salt in the inner cavity 11 is realized, so that the molten salt in the inner cavity 11 is heated evenly, effectively improving the heat storage capacity of the molten - salt heat - storage tank.

[0042] In order to prevent violent impact caused by a large drop of molten salt when adding molten salt to the inner cavity 11, an anti - impact salt - conveying device 4 is provided on the tank body 1. The anti - impact salt - conveying device 4 includes a salt - pumping pump 41 fixed on the top of the tank body 1. The output end of the salt - pumping pump 41 is communicated with a salt - conveying pipe, and the salt - conveying pipe extends into the inner cavity 11 along the salt inlet 111. A plurality of high - temperature solenoid valves 42 are arranged at intervals on the salt - conveying pipe, and the plurality of high - temperature solenoid valves 42 are evenly spaced along the height direction of the tank body 1.

[0043] When conveying salt to the inner cavity 11, start the salt - pumping pump, and open each high - temperature solenoid valve 42 separately in sequence from the bottom to the top of the inner cavity 11. The specific operation method is to first open the lowermost high - temperature solenoid valve 42, close it when the molten salt in the inner cavity 11 submerges this high - temperature solenoid valve 42, and at the same time start the next high - temperature solenoid valve 42. This greatly reduces the drop of the molten salt flowing into the inner cavity 11, effectively reducing the impact force on the tank body 1 when adding molten salt and extending the service life of the tank body 1.

[0044] In the embodiment of the present application, the stirrer in the stirring device 3 and the salt - conveying pipe in the anti - impact salt - conveying device 4 share an internally hollow - arranged serpentine pipe 51. The serpentine pipe 51 can not only realize the stirring function of the stirrer but also the salt - conveying function of the salt - conveying pipe.

[0045] A rotating shaft tube 32 is fixedly and communicatively arranged on the coiled tube 51. The coiled tube 51 is rotatably connected to the tank body 1 through the rotating shaft tube 32, and the rotating shaft tube 32 penetrates through the salt inlet 111. One end of the rotating shaft tube 32 away from the coiled tube 51 is located outside the tank body 1. The output end of the driving motor 31 is coaxially and fixedly connected with a driving gear 33. One end of the rotating shaft tube 32 located outside the tank body 1 is coaxially and fixedly connected with a driven gear 34. The driving gear 33 and the driven gear 34 mesh with each other. A plurality of high-temperature solenoid valves 42 are respectively arranged at a plurality of bending parts of the coiled tube 51. The output end of the salt conveying pump is communicated with and rotatably connected to the rotating shaft tube 32 through a pipeline.

[0046] Start the driving motor 31 and at the same time turn on the salt conveying pump. The driving motor 31 drives the rotating shaft tube 32 and the coiled tube 51 to rotate through the driving gear 33 and the driven gear 34. The positions of the high-temperature solenoid valves 42 change at all times, and the molten salt can enter the tank body 1 from different positions, so that the later-added molten salt and the already-added molten salt are fully mixed, further improving the heat storage capacity and heat storage efficiency.

[0047] Refer to Figure 3 , at least one electric heating device for performing a heat preservation and heating function on the inner cavity 11 is arranged in the outer cavity 12. The electric heating device includes an electric heating tube 61 and an electric heater. The electric heater is used to provide a heating source for the electric heating tube 61, and the electric heating tube 61 is used to output heat. And the electric heating tube 61 is arranged in a serpentine shape around the side wall of the outer cavity 12 close to the inner cavity 11, which can effectively improve the uniformity of heating, and a longer heating pipeline can be laid in a fixed space, improving the heating and heat preservation effect.

[0048] In the embodiment of the present application, four mutually independent independent chambers 121 are arranged in the outer cavity 12. A closable protective door is arranged at the top of each independent chamber 121, and a set of electric heating devices is arranged in each independent chamber 121. By arranging a plurality of independent chambers 121 in the outer cavity 12, a protective door is arranged at the top of each independent chamber 121, and an electric heating device is arranged in each independent chamber 121. When a plurality of electric heating devices operate simultaneously and a certain electric heating device fails, the electric heating device in the faulty area can be repaired and maintained specifically, avoiding the loss of the heating function after a failure when a single electric heating device is used.

[0049] A sliding device 7 is arranged on the side wall of each independent chamber 121 close to the inner cavity 11. The sliding device 7 includes a sliding track 71 fixed to the side wall of the independent chamber 121 close to the inner cavity 11. The track direction of the sliding track 71 is arranged along the height direction of the tank body 1. A support frame 72 is slidably connected to the sliding track 71, and the electric heating tube 61 is fixed to the support frame 72.

[0050] When the electric heating tube 61 fails, open the protective door on the corresponding independent chamber 121, and lift the corresponding support frame 72 along the height direction of the tank body 1, so as to facilitate the inspection and maintenance of the faulty electric heating tube 61, and greatly facilitate the repair of the electric heating tube 61.

[0051] The implementation principle of the above embodiment is as follows:

[0052] During the heat storage process of the heat storage tank, turn on the drive motor 31, and the drive motor 31 drives the serpentine tube 51 to rotate, so that the molten salt inside the tank body 1 is mixed evenly, effectively improving the heat storage capacity of the molten salt heat storage tank. When inputting molten salt into the tank body 1, turn on the salt pump and start the drive motor 31 at the same time. While the serpentine tube 51 rotates, the position of the high-temperature solenoid valve 42 changes at all times, and the molten salt can enter the tank body 1 from different positions, so that the later added molten salt and the already added molten salt are fully mixed, further improving the heat storage capacity and heat storage efficiency.

[0053] The above are all the preferred embodiments of this application. The protection scope of this application is not limited by this. 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 molten salt heat storage tank, characterized in that: it includes a base (2), a tank body (1) arranged on the base (2), and a stirring device (3); a salt inlet (111) is arranged at the top of the tank body (1), and a salt outlet (112) is arranged at the bottom of the tank body (1); the stirring device (3) includes a driving motor (31) and a stirrer, the stirrer is rotatably connected inside the tank body (1), the driving motor (31) is arranged at the top of the tank body (1) and drives the stirrer to rotate; it further includes an anti-impact salt conveying device (4), the anti-impact salt conveying device (4) includes a salt pump, a salt conveying pipe, and a plurality of high-temperature solenoid valves (42); the salt pump is fixed outside the tank body (1), one end of the salt conveying pipe is communicated with the output end of the salt pump, and the end of the salt conveying pipe away from the salt pump extends into the tank body (1) along the salt inlet (111); a plurality of the high-temperature solenoid valves (42) are all arranged on the salt conveying pipe, and the plurality of high-temperature solenoid valves (42) are arranged at intervals along the height direction of the tank body (1).

2. A molten salt heat storage tank according to claim 1, characterized in that: a serpentine pipe (51) with a hollow interior is arranged inside the tank body (1), a rotating shaft pipe (32) is fixedly connected and communicated with the serpentine pipe (51), the serpentine pipe (51) is rotatably connected to the tank body (1) through the rotating shaft pipe (32), and the rotating shaft pipe (32) penetrates through the salt inlet (111); the driving motor (31) can drive the rotating shaft pipe (32) and the serpentine pipe (51) to rotate simultaneously; the output end of the salt pump is communicated with the rotating shaft pipe (32), and a plurality of the high-temperature solenoid valves (42) are all arranged on the serpentine pipe (51).

3. A molten salt heat storage tank according to claim 2, characterized in that: the output end of the driving motor (31) is coaxially fixedly connected with a driving gear (33), the rotating shaft pipe (32) is coaxially fixedly connected with a driven gear (34), and the driving gear (33) and the driven gear (34) mesh with each other.

4. A molten salt heat storage tank according to claim 1, characterized in that: the tank body (1) includes an inner cavity (11) and an outer cavity (12) which are independently arranged, the inner cavity (11) is used for storing molten salt, and an electric heating device is arranged in the outer cavity (12).

5. A molten salt heat storage tank according to claim 4, characterized in that: a plurality of independent chambers (121) are evenly arranged in the outer cavity (12), a protective door is installed at the top of each independent chamber (121), and the electric heating device is arranged in each independent chamber (121).

6. A molten salt heat storage tank according to claim 4, characterized in that: a sliding device (7) is arranged on the side wall of the outer cavity (12) close to the inner cavity (11), the sliding direction of the sliding device (7) is arranged along the height direction of the tank body (1), and the electric heating device is arranged on the sliding device (7).

7. A molten salt heat storage tank according to claim 4, characterized in that: the electric heating device includes an electric heating tube (61), and the electric heating tube (61) is arranged in a serpentine coil on the side wall of the outer cavity (12) close to the inner cavity (11).

8. A molten salt heat storage tank according to claim 1, characterized in that: a space heat insulation coating heat preservation layer is arranged outside the tank body (1).

9. A molten salt heat storage tank according to claim 1, characterized in that: the base (2) includes a 200mm fine sand leveling layer, a 20mm steel plate bearing layer and a 300mm refractory concrete layer arranged from bottom to top.

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