Electric energy storage energy conversion device based on fused salt heat storage

Abstract

The invention discloses an electric energy storage energy conversion device based on fused salt heat storage, and relates to the technical field of fused salt heat storage, the electric energy storage energy conversion device comprises a supporting seat and a fused salt tank fixedly connected to the top of the supporting seat, and the top of the fused salt tank is fixedly connected with a motor through a connecting frame. According to the electric energy storage energy conversion device based on fused salt heat storage, a motor is controlled to drive a rotating rod to rotate, the rotating rod drives a plurality of rotating plates to rotate through a rotating sleeve, the plurality of rotating plates stir fused salt, the mobility of the fused salt is improved, meanwhile, the rotating rod can be driven to rotate reversely through a transmission wheel and a transmission belt, and the mobility of the fused salt is improved. A rotating rod can drive an annular connecting plate to rotate through a gear and an annular tooth plate, and the annular connecting plate can drive electric heaters to rotate through an annular rotating plate, so that the two electric heaters rotate in the fused salt, the fused salt is in full contact, and the contact efficiency of the electric heaters and the fused salt can be well improved; the power-on use time of the electric heater can be shortened, and certain energy consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the field of molten salt heat storage technology, and in particular to an electric energy storage and energy conversion device based on molten salt heat storage. Background Art

[0002] Thermal power units have a large basic capacity and need to store large and high-quality energy during deep peak regulation. Molten salt heat storage is a sensible heat storage of molten inorganic salts, which uses the change in molten salt temperature to store heat. It has the advantages of large capacity and high thermal energy quality. It is suitable for deep peak regulation of thermal power units. The molten salt heat storage energy storage method is formed by a molten salt heat storage cycle and a molten salt heat release cycle.

[0003] Among them, the molten salt heat storage cycle: the low-temperature molten salt in the cold salt tank is heated by wind power, photovoltaic power, and night-time low-valley electricity. The heated high-temperature molten salt enters the hot salt tank for storage, completing the molten salt heat storage cycle; the molten salt heat release cycle: the high-temperature molten salt in the hot salt tank is exchanged with water through a molten salt pump, and the molten salt after heat release enters the cold salt tank for storage, completing the molten salt heat release cycle.

[0004] Existing methods of heating molten salt are to use electric heaters, but the position of the electric heaters is fixed, the fluidity of the molten salt in the salt storage tank is poor, and the contact between the molten salt and the electric heater is not sufficient, resulting in the electric heater heating and storing the molten salt for a long time. Long-term use of the electric heater will consume more electricity, and after the molten salt exchanges heat with water, the molten salt will have a certain amount of waste heat after the heat is released, and the waste heat of the molten salt is not utilized. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides an electric energy storage and energy conversion device based on molten salt heat storage, which solves the problems of poor fluidity of molten salt in the salt storage tank and insufficient contact between the molten salt and the electric heater, which causes the electric heater to heat and store the molten salt for a long time. Long-term use of the electric heater will consume more electricity and the molten salt will have a certain amount of waste heat after heat release, and the waste heat of the molten salt will not be utilized.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an electric energy storage and energy conversion device based on molten salt heat storage, comprising a support base and a molten salt tank fixedly connected to the top of the support base, the top of the molten salt tank is fixedly connected to the motor through a connecting frame, the output shaft of the motor is fixedly connected to a rotating rod through a coupling, one end of the rotating rod passes through the molten salt tank and extends to the interior of the molten salt tank, the surface of the rotating rod and the interior of the molten salt tank are fixedly connected with several rotating sleeves, both sides of the rotating sleeve are fixedly connected with a rotating plate, the top of the molten salt tank is rotatably connected to an annular rotating plate through an opening, the top of the annular rotating plate is fixedly connected to an annular connecting plate, the top of the molten salt tank and one side of the motor is provided with a transmission mechanism compatible with the annular connecting plate, both sides of the top of the annular connecting plate are fixedly installed with an electric heater through an opening, and the bottom of the electric heater passes through the annular rotating plate and extends to the interior of the molten salt tank.

[0007] Preferably, the transmission mechanism includes a rotating rod, which is rotatably connected to the top of the molten salt tank through a bearing, and the surface of the rotating rod and the surface of the rotating rod are both fixedly connected with a transmission wheel, and a transmission belt is connected between the two transmission wheels. A gear is fixedly connected to the surface of the rotating rod and located below the transmission wheel, and an annular tooth plate adapted to the gear is fixedly connected to the top of the annular connecting plate.

[0008] Preferably, one side of the top of the support seat is fixedly connected to a heat exchange tank through a support block, and a molten salt pump is fixedly installed on the top of the support seat and between the molten salt tank and the heat exchange tank. The liquid inlet end of the molten salt pump is connected to a liquid inlet pipe, and one end of the liquid inlet pipe passes through the molten salt tank and extends to the interior of the molten salt tank.

[0009] Preferably, the liquid outlet end of the molten salt pump is connected to a liquid outlet pipe, one end of the liquid outlet pipe passes through the heat exchange tank and extends to the interior of the heat exchange tank, the top of the heat exchange tank is connected to a drain pipe, and a curved pipe is connected between one end of the liquid outlet pipe extending to the interior of the heat exchange tank and one end of the drain pipe.

[0010] Preferably, a water inlet pipe is connected to the lower part of one side of the heat exchange tank, and a water outlet pipe is connected to the upper part of one side of the heat exchange tank.

[0011] Preferably, a heat preservation tube is fixedly connected to the surface of the molten salt tank, the other end of the liquid discharge pipe is connected to a liquid adding tube, and one end of the liquid adding tube passes through the heat preservation tube and extends to the inside of the heat preservation tube.

[0012] Preferably, a circulation pipe is connected to the lower side of one side of the insulation cylinder, a recovery pipe is connected between one end of the liquid adding pipe extending to the inside of the insulation cylinder and one end of the circulation pipe, and the other end of the circulation pipe passes through the molten salt tank and extends to the inside of the molten salt tank.

[0013] Preferably, a plurality of through holes are provided on the front of the rotating plate.

[0014] Beneficial effects The present invention provides an electric energy storage and energy conversion device based on molten salt heat storage. Compared with existing technologies, it has the following advantages: (1) The invention controls the motor to drive the rotating rod to rotate, so that the rotating rod drives the multiple rotating plates to rotate through the rotating sleeve, so that the multiple rotating plates stir the molten salt and increase the fluidity of the molten salt. At the same time, the rotating rod drives the rotating rod to rotate in the opposite direction through the transmission wheel and the transmission belt. The rotating rod drives the annular connecting plate to rotate through the gear and the annular tooth plate. The annular connecting plate drives the electric heater to rotate through the annular rotating plate, so that the two electric heaters rotate in the molten salt, which makes the contact with the molten salt more sufficient, can greatly improve the contact efficiency between the electric heater and the molten salt, heat the molten salt more quickly, can reduce the time the electric heater is powered on, and reduce a certain amount of energy consumption.

[0015] (2) This invention allows the molten salt after heat exchange in the heat exchange tank to enter the liquid adding pipe, which then passes the molten salt into the recovery pipe. The residual heat of the molten salt in the recovery pipe is used to heat and insulate the molten salt tank, effectively slowing down the heat loss in the molten salt tank and making good use of the residual heat of the molten salt after heat exchange.

[0016] (3) The invention controls the liquid inlet pipe on the molten salt pump to extract molten salt from the molten salt tank, and then pumps the molten salt into the curved tube in the heat exchange tank. The molten salt in the curved tube is used to exchange heat with the water in the heat exchange tank. The curved tube is in more complete contact with the water, thereby improving the effect of heat exchange. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the external structure of the present invention; Figure 2 A cross-sectional view of the molten salt tank and the insulation cylinder structure of the present invention; Figure 3 It is a structural schematic diagram of the motor, rotating rod, rotating sleeve, rotating plate, annular connecting plate, transmission mechanism and electric heater of the present invention; Figure 4 This is a structural diagram of the molten salt tank, annular rotating plate, insulation cylinder, liquid adding pipe and annular rotating plate of the present invention; Figure 5 This is a schematic structural diagram of the heat preservation tube, liquid adding pipe, recovery pipe and circulation pipe of the present invention; Figure 6 Schematic diagram of the internal structure of the heat exchange tank, liquid outlet pipe, curved pipe, liquid drain pipe, water inlet pipe and water outlet pipe of the present invention; Figure 7 It is a schematic structural diagram of the liquid outlet pipe, curved pipe and liquid discharge pipe of the present invention.

[0018] In the figure: 1. support base; 2. molten salt tank; 3. motor; 4. rotating rod; 5. rotating sleeve; 6. rotating plate; 7. annular rotating plate; 8. annular connecting plate; 9. transmission mechanism; 10. electric heater; 11. heat exchange tank; 12. molten salt pump; 13. liquid inlet pipe; 14. liquid outlet pipe; 15. curved pipe; 16. liquid discharge pipe; 17. insulation cylinder; 18. liquid adding pipe; 19. recovery pipe; 20. circulation pipe; 21. water inlet pipe; 22. water outlet pipe; 23. through hole; 91. rotating rod; 92. transmission wheel; 93. transmission belt; 94. gear; 95. annular tooth plate. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] The present invention provides two technical solutions: Example 1 See also Figure 1-7 , an electric energy storage and energy conversion device based on molten salt heat storage, including a support base 1 and a molten salt tank 2 fixedly connected to the top of the support base 1, the top of the molten salt tank 2 is fixedly connected to a motor 3 through a connecting frame, the motor 3 is a servo motor, and is electrically connected to the battery on the annular connecting plate 8 and is controlled by a control switch, the output shaft of the motor 3 is fixedly connected to a rotating rod 4 through a coupling, one end of the rotating rod 4 passes through the molten salt tank 2 and extends to the inside of the molten salt tank 2, the surface of the rotating rod 4 and is located inside the molten salt tank 2 and is fixedly connected to a plurality of rotating sleeves 5, and the two ends of the rotating sleeve 5 The sides are fixedly connected with a rotating plate 6, the top of the molten salt tank 2 is rotatably connected with an annular rotating plate 7 through an opening, the top of the annular rotating plate 7 is fixedly connected with an annular connecting plate 8, and the top of the molten salt tank 2 and one side of the motor 3 are provided with a transmission mechanism 9 adapted to the annular connecting plate 8. Electric heaters 10 are fixedly installed on both sides of the top of the annular connecting plate 8 through openings. The electric heater 10 is electrically connected to the battery on the annular connecting plate 8 and is controlled by a control switch. The bottom of the electric heater 10 passes through the annular rotating plate 7 and extends to the interior of the molten salt tank 2.

[0021] Furthermore, in order to improve the stirring effect of the rotating plate 6 , a plurality of through holes 23 are opened on the front portion of the rotating plate 6 .

[0022] Furthermore, in order to drive the two electric heaters 10 to rotate in opposite directions, the transmission mechanism 9 includes a rotating rod 91, which is rotatably connected to the top of the molten salt tank 2 through a bearing. The surface of the rotating rod 91 and the surface of the rotating rod 4 are fixedly connected to a transmission wheel 92, and a transmission belt 93 is connected between the two transmission wheels 92. A gear 94 is fixedly connected to the surface of the rotating rod 91 and located below the transmission wheel 92, and an annular tooth plate 95 adapted to the gear 94 is fixedly connected to the top of the annular connecting plate 8.

[0023] Example 2 See also Figure 1-7 , an electric energy storage and energy conversion device based on molten salt heat storage, including a support base 1 and a molten salt tank 2 fixedly connected to the top of the support base 1, the top of the molten salt tank 2 is fixedly connected to a motor 3 through a connecting frame, the motor 3 is a servo motor, and is electrically connected to the battery on the annular connecting plate 8 and is controlled by a control switch, the output shaft of the motor 3 is fixedly connected to a rotating rod 4 through a coupling, one end of the rotating rod 4 passes through the molten salt tank 2 and extends to the inside of the molten salt tank 2, the surface of the rotating rod 4 and is located inside the molten salt tank 2 and is fixedly connected to a plurality of rotating sleeves 5, and the two ends of the rotating sleeve 5 The sides are fixedly connected with a rotating plate 6, the top of the molten salt tank 2 is rotatably connected with an annular rotating plate 7 through an opening, the top of the annular rotating plate 7 is fixedly connected with an annular connecting plate 8, and the top of the molten salt tank 2 and one side of the motor 3 are provided with a transmission mechanism 9 adapted to the annular connecting plate 8. Electric heaters 10 are fixedly installed on both sides of the top of the annular connecting plate 8 through openings. The electric heater 10 is electrically connected to the battery on the annular connecting plate 8 and is controlled by a control switch. The bottom of the electric heater 10 passes through the annular rotating plate 7 and extends to the interior of the molten salt tank 2.

[0024] Furthermore, in order to improve the stirring effect of the rotating plate 6 , a plurality of through holes 23 are opened on the front portion of the rotating plate 6 .

[0025] Furthermore, in order to drive the two electric heaters 10 to rotate in opposite directions, the transmission mechanism 9 includes a rotating rod 91, which is rotatably connected to the top of the molten salt tank 2 through a bearing. The surface of the rotating rod 91 and the surface of the rotating rod 4 are fixedly connected to a transmission wheel 92, and a transmission belt 93 is connected between the two transmission wheels 92. A gear 94 is fixedly connected to the surface of the rotating rod 91 and located below the transmission wheel 92, and an annular tooth plate 95 adapted to the gear 94 is fixedly connected to the top of the annular connecting plate 8.

[0026] Furthermore, in order to convert energy of molten salt, a heat exchange tank 11 is fixedly connected to one side of the top of the support base 1 through a support block, and a molten salt pump 12 is fixedly installed on the top of the support base 1 and located between the molten salt tank 2 and the heat exchange tank 11. The molten salt pump 12 is electrically connected to an external power supply and is controlled by a control switch. The liquid inlet end of the molten salt pump 12 is connected to a liquid inlet pipe 13, one end of the liquid inlet pipe 13 passes through the molten salt tank 2 and extends to the interior of the molten salt tank 2, the liquid outlet end of the molten salt pump 12 is connected to a liquid outlet pipe 14, one end of the liquid outlet pipe 14 passes through the heat exchange tank 11 and extends to the interior of the heat exchange tank 11, the top of the heat exchange tank 11 is connected to a drain pipe 16, and a curved pipe 15 is connected between one end of the liquid outlet pipe 14 extending to the interior of the heat exchange tank 11 and one end of the drain pipe 16. A water inlet pipe 21 is connected to the bottom of one side of the heat exchange tank 11, and a water outlet pipe 22 is connected to the top of one side of the heat exchange tank 11.

[0027] It should be noted that the water inlet pipe 21 is connected to an external water pump to perform energy conversion on the water added into the heat exchange tank 11 .

[0028] Furthermore, in order to facilitate the utilization of the waste heat of the molten salt in the heat exchange, an insulation tube 17 is fixedly connected to the surface of the molten salt tank 2, and the other end of the discharge pipe 16 is connected to a liquid adding pipe 18. One end of the liquid adding pipe 18 passes through the insulation tube 17 and extends to the interior of the insulation tube 17. A circulation pipe 20 is connected to the lower part of one side of the insulation tube 17. A recovery pipe 19 is connected between one end of the liquid adding pipe 18 extending to the interior of the insulation tube 17 and one end of the circulation pipe 20. The other end of the circulation pipe 20 passes through the molten salt tank 2 and extends to the interior of the molten salt tank 2.

[0029] During use, by energizing the two electric heaters 10, the two electric heaters 10 heat the molten salt in the molten salt tank 2, and at the same time controlling the motor 3 to drive the rotating rod 4 to rotate, the rotating rod 4 will drive the multiple rotating plates 6 to rotate through the multiple rotating sleeves 5, and the multiple rotating plates 6 will stir the molten salt. When the rotating rod 4 rotates, it will drive the rotating rod 91 to rotate synchronously through the transmission wheel 92 and the transmission belt 93. The rotating rod 91 will drive the annular connecting plate 8 to rotate in the opposite direction through the transmission belt 93 and the gear 94. The annular connecting plate 8 will drive the two electric heaters 10 to rotate in the opposite direction through the annular rotating plate 7, so that the rotating plate 6 and the two electric heaters 10 rotate in the opposite direction, thereby improving the fluidity of the molten salt, making the two electric heaters 10 fully contact with the molten salt, and ensuring the uniformity of the molten salt heating; When energy conversion is required for molten salt heat exchange, the liquid inlet pipe 13 on the molten salt pump 12 is controlled to extract molten salt from the molten salt tank 2, and the molten salt is discharged into the curved pipe 15 through the liquid outlet pipe 14. At the same time, water is added to the heat exchange tank 11 through the water inlet pipe 21, and the water in the heat exchange tank 11 is heated through the curved pipe 15, so that the water discharged from the water outlet pipe 22 evaporates and drives the turbine to generate electricity, thereby converting thermal energy into electrical energy; After the temperature of the molten salt in the curved tube 15 drops, it will be discharged to the liquid adding pipe 18 through the discharge pipe 16, and the molten salt will be passed into the recovery pipe 19 through the liquid adding pipe 18. The residual heat of the molten salt in the recovery pipe 19 is used to keep the molten salt tank 2 warm and utilize the residual heat of the molten salt. The molten salt in the recovery pipe 19 will be added to the molten salt tank 2 again through the circulation pipe 20 to realize circulation.

[0030] During use, by energizing the two electric heaters 10, the two electric heaters 10 heat the molten salt in the molten salt tank 2, and at the same time controlling the motor 3 to drive the rotating rod 4 to rotate, the rotating rod 4 will drive the multiple rotating plates 6 to rotate through the multiple rotating sleeves 5, and the multiple rotating plates 6 will stir the molten salt. When the rotating rod 4 rotates, it will drive the rotating rod 91 to rotate synchronously through the transmission wheel 92 and the transmission belt 93. The rotating rod 91 will drive the annular connecting plate 8 to rotate in the opposite direction through the transmission belt 93 and the gear 94. The annular connecting plate 8 will drive the two electric heaters 10 to rotate in the opposite direction through the annular rotating plate 7, so that the rotating plate 6 and the two electric heaters 10 rotate in the opposite direction, thereby improving the fluidity of the molten salt, making the two electric heaters 10 fully contact with the molten salt, and ensuring the uniformity of the molten salt heating; When energy conversion is required for molten salt heat exchange, the liquid inlet pipe 13 on the molten salt pump 12 is controlled to extract molten salt from the molten salt tank 2, and the molten salt is discharged into the curved pipe 15 through the liquid outlet pipe 14. At the same time, water is added to the heat exchange tank 11 through the water inlet pipe 21, and the water in the heat exchange tank 11 is heated through the curved pipe 15, so that the water discharged from the water outlet pipe 22 evaporates and drives the turbine to generate electricity, thereby converting thermal energy into electrical energy; After the temperature of the molten salt in the curved tube 15 drops, it will be discharged to the liquid adding pipe 18 through the discharge pipe 16, and the molten salt will be passed into the recovery pipe 19 through the liquid adding pipe 18. The residual heat of the molten salt in the recovery pipe 19 is used to keep the molten salt tank 2 warm and utilize the residual heat of the molten salt. The molten salt in the recovery pipe 19 will be added to the molten salt tank 2 again through the circulation pipe 20 to realize circulation.

[0031] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0032] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An electric energy storage and energy conversion device based on molten salt heat storage, comprising a support base (1) and a molten salt tank (2) fixedly connected to the top of the support base (1), characterized in that: The top of the molten salt tank (2) is fixedly connected to a motor (3) through a connecting frame, the output shaft of the motor (3) is fixedly connected to a rotating rod (4) through a coupling, one end of the rotating rod (4) penetrates the molten salt tank (2) and extends to the interior of the molten salt tank (2), a plurality of rotating sleeves (5) are fixedly connected to the surface of the rotating rod (4) and located inside the molten salt tank (2), both sides of the rotating sleeves (5) are fixedly connected to rotating plates (6), the top of the molten salt tank (2) is rotatably connected to an annular rotating plate (7) through an opening, the top of the annular rotating plate (7) is fixedly connected to an annular connecting plate (8), a transmission mechanism (9) adapted to the annular connecting plate (8) is provided on the top of the molten salt tank (2) and located on one side of the motor (3), electric heaters (10) are fixedly installed on both sides of the top of the annular connecting plate (8) through the opening, the bottom of the electric heater (10) penetrates the annular rotating plate (7) and extends to the interior of the molten salt tank (2).

2. The electric energy storage and energy conversion device based on molten salt heat storage according to claim 1, characterized in that: The transmission mechanism (9) includes a rotating rod (91), the rotating rod (91) is rotatably connected to the top of the molten salt tank (2) through a bearing, the surface of the rotating rod (91) and the surface of the rotating rod (4) are fixedly connected to a transmission wheel (92), a transmission belt (93) is connected between the two transmission wheels (92), a gear (94) is fixedly connected to the surface of the rotating rod (91) and located below the transmission wheel (92), and an annular tooth plate (95) adapted to the gear (94) is fixedly connected to the top of the annular connecting plate (8).

3. The electric energy storage and energy conversion device based on molten salt heat storage according to claim 1, characterized in that: A heat exchange tank (11) is fixedly connected to one side of the top of the support base (1) via a support block, and a molten salt pump (12) is fixedly installed on the top of the support base (1) and located between the molten salt tank (2) and the heat exchange tank (11), and a liquid inlet end of the molten salt pump (12) is connected to a liquid inlet pipe (13), and one end of the liquid inlet pipe (13) passes through the molten salt tank (2) and extends to the interior of the molten salt tank (2).

4. The electric energy storage and energy conversion device based on molten salt heat storage according to claim 3 is characterized in that: The liquid outlet end of the molten salt pump (12) is connected to a liquid outlet pipe (14), one end of the liquid outlet pipe (14) passes through the heat exchange tank (11) and extends to the interior of the heat exchange tank (11), the top of the heat exchange tank (11) is connected to a liquid discharge pipe (16), and a curved pipe (15) is connected between one end of the liquid outlet pipe (14) extending to the interior of the heat exchange tank (11) and one end of the liquid discharge pipe (16).

5. The electric energy storage and energy conversion device based on molten salt heat storage according to claim 3 is characterized in that: A water inlet pipe (21) is connected to the bottom of one side of the heat exchange tank (11), and a water outlet pipe (22) is connected to the top of one side of the heat exchange tank (11).

6. The electric energy storage and energy conversion device based on molten salt heat storage according to claim 4, characterized in that: A heat preservation tube (17) is fixedly connected to the surface of the molten salt tank (2), the other end of the liquid discharge pipe (16) is connected to a liquid adding pipe (18), and one end of the liquid adding pipe (18) passes through the heat preservation tube (17) and extends to the interior of the heat preservation tube (17).

7. The electric energy storage and energy conversion device based on molten salt heat storage according to claim 6, characterized in that: A circulation pipe (20) is connected below one side of the heat preservation tube (17), a recovery pipe (19) is connected between one end of the liquid adding pipe (18) extending into the interior of the heat preservation tube (17) and one end of the circulation pipe (20), and the other end of the circulation pipe (20) passes through the molten salt tank (2) and extends into the interior of the molten salt tank (2).

8. The electric energy storage and energy conversion device based on molten salt heat storage according to claim 1, characterized in that: A plurality of through holes (23) are provided on the front of the rotating plate (6).

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