Fused salt energy storage electric heating system

Abstract

The utility model relates to the technical field of fused salt energy storage, in particular to a fused salt energy storage electric heating system which comprises a fused salt energy storage tank, a feeding port and a control terminal, the feeding port is fixedly formed in the top end of the fused salt energy storage tank, a fused salt electric heating corrosion-preventing contact structure is arranged in the fused salt energy storage tank, and the control terminal is connected with the fused salt energy storage tank. An electric heater heat loss reducing structure is arranged above the fused salt energy storage tank, and a fused salt energy storage heat exchange structure is arranged at one end of the inner side of the fused salt energy storage tank. According to the fused salt energy storage electric heating system, heat generated after the electric heating rod is connected with the power supply can be firstly conveyed to the heat conduction block, then the heat conduction block transmits the heat to the fused salt substance outside the inner cylinder for heating and energy storage, the metal heating rod cannot make direct contact with high-temperature fused salt, corrosion and damage to the metal heating rod are reduced, and the service life of the metal heating rod is prolonged. And the service life of the electric heating result is prolonged, and the use cost investment of the fused salt energy storage electric heating system is indirectly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of molten salt energy storage, in particular to a molten salt energy storage electric heating system. Background Art

[0002] Molten salt thermal energy storage is an emerging energy storage technology. Currently, the commonly used methods for molten salt energy storage are: high-temperature salt tanks, low-temperature salt tanks, heat exchangers, electric heaters, and circulating pumps to circulate high-temperature molten salt liquid for heating and heat exchange; used for high-pressure steam to drive steam turbines for power generation, or for winter heating for residents. The current molten salt heating, circulation, storage, and heat exchange equipment are expensive and the entire system design is complex. In addition, all pipeline equipment needs to be preheated and insulated to keep the molten salt liquid temperature not lower than 150°C, otherwise the liquid molten salt may solidify.

[0003] For example, the publication number "CN204063575U" is named a molten salt energy storage heating and heat exchange system, which generates high-pressure steam through heat exchange tubes to drive steam turbines to generate electricity, thereby supplementing the power shortage during peak hours. Compared with other energy storage methods, molten salt energy storage power generation has the advantages of small investment, quick results, low price of energy storage medium, wide source, easy material acquisition, and high heat conversion efficiency. However, the existing molten salt energy storage heating and heat exchange system requires an electric heating structure to be inserted into the energy storage molten salt inside the molten salt tank, and then the heat generated by the electric heater is energized to melt the molten salt and store heat energy. However, the electric heaters on the market are generally made of metal materials, and the good electrical conductivity and heating properties of metal materials are used to achieve the purpose of heating the molten salt. However, after the molten salt melts to form a molten salt solution, its internal temperature will be very high, and the molten salt is more likely to react with metal products in chemical properties. In this way, the electric heater made of metal materials will be corroded by the high-temperature molten salt, resulting in an extremely limited service life of the electric heater, thereby affecting the use cost of the molten salt energy storage heating and heat exchange system.

[0004] At the same time, when the electric heater needs to heat the stored molten salt and transfer heat, a power cord is needed to power the electric heater. However, most power cords are made of rubber and are not resistant to high temperatures. This requires that part of the electric heater be set on the outer wall of the molten salt energy storage tank. The part of the electric heater that extends beyond the outer wall of the molten salt storage tank will cause part of the stored heat to dissipate outward. Ultimately, the loss of stored heat will affect the energy storage effect of the molten salt energy storage heating and heat exchange system. Utility Model Content

[0005] The purpose of the utility model is to solve the problems of increased use cost and poor energy storage effect of molten salt energy storage heating and heat exchange systems, and to propose a molten salt energy storage electric heating system.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A molten salt energy storage electric heating system is designed, including a molten salt energy storage tank, a feed port and a control terminal. The feed port is fixedly opened at the top of the molten salt energy storage tank. A molten salt electric heating contact structure to avoid corrosion is provided inside the molten salt energy storage tank. An electric heater to reduce heat loss is provided above the molten salt energy storage tank. A molten salt energy storage heat exchange structure is provided at one inner end of the molten salt energy storage tank. A molten salt feeding and discharging structure is provided on the outer wall of the molten salt energy storage tank.

[0008] Preferably, the molten salt electric heating corrosion-avoiding contact structure includes an inner cylinder and a connecting frame, the inner cylinder is fixedly installed inside the molten salt energy storage tank, the outer wall of the inner cylinder is fixedly connected to a plurality of heat-conducting blocks, the inner walls of the plurality of heat-conducting blocks are movably connected to electric heating rods, the connecting frame is fixedly installed on the top of the electric heating rod, and an insulating wire is fixedly connected to the top of the connecting frame.

[0009] Preferably, the electric heater heat loss reduction structure includes a cylinder and a steel cable, the two cylinders are fixedly mounted on the top of the molten salt energy storage tank, a top plate is fixedly connected above the two cylinders, an extension frame is fixedly connected to one side of the top of the two cylinders, and two steel cables are fixedly connected below the top plate.

[0010] Preferably, the sides of the two extension frames are fixedly connected to the bottom of the top plate, the outer sides of the two steel cables are movably connected to the inside of the feed port, the bottom ends of the two steel cables are fixedly connected to the top of the connecting frame, the control terminal is fixedly installed above the top plate, and the bottom of the control terminal is connected to the insulation wire.

[0011] Preferably, the molten salt energy storage and heat exchange structure includes a water inlet pipe and a fixing hoop, a plurality of the fixing hoops are fixedly connected to one side of the inner wall of the molten salt energy storage tank, the outer sides of the plurality of the fixing hoops are fixedly sleeved with a water inlet pipe, one end of the water inlet pipe is connected to the outer wall of the molten salt energy storage tank, the other end of the water inlet pipe is fixedly connected to a heat exchange pipe, the outer side of the heat exchange pipe is fixedly connected to the outer wall of the molten salt energy storage tank, and a heat exchange pump is fixedly installed on the outside of the heat exchange pipe.

[0012] Preferably, the molten salt feeding and discharging structure includes a discharge pipe and a feeding pipe, the feeding pipe is fixedly connected above the outer wall of the molten salt energy storage tank, the discharge pipe is fixedly connected below the outer wall of the molten salt energy storage tank, and a discharge valve is fixedly installed on the inner side of the discharge pipe.

[0013] The utility model proposes a molten salt energy storage electric heating system, which has the following beneficial effects: the heat generated by the electric heating rod after connecting to the power supply will first be transmitted to the heat conductive block, and then the heat conductive block will transmit the heat to the molten salt material outside the inner cylinder for heating and energy storage. The heat-insulating wire can perform normal power supply work inside the molten salt energy storage tank for high-temperature energy storage, so that the metal heating rod will not directly contact the high-temperature molten salt, reducing the corrosion and damage to the metal heating rod, improving the service life of the electric heating result, and indirectly reducing the use cost investment of the molten salt energy storage electric heating system.

[0014] The extension frame uses an oblique support reinforcement method to support the top plate on the top of the cylinder. The connecting frame can drive the inner electric heating rod to be pulled out upward in the inner cylinder. The cylinder can drive the top plate to move up or down. Lifting the top plate upward can pull out the electric heating rod for easy maintenance and replacement. The top plate moving downward in the opposite direction can fall to the top of the feed port and close the feed port, so that the electric heating rod is completely inside the molten salt energy storage tank to work, minimizing heat loss during heating and improving the energy storage effect of the molten salt energy storage electric heating system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0016] Figure 2 for Figure 1 A front cross-sectional schematic diagram of ;

[0017] Figure 3 for Figure 1 A schematic cross-sectional view of the top surface;

[0018] Figure 4 for Figure 2 Enlarged cross-sectional view of part A in the middle;

[0019] Figure 5 for Figure 2 Enlarged cross-sectional view of part B in the middle;

[0020] Figure 6 for Figure 2 Enlarged cross-sectional view of part C in the middle.

[0021] In the figure: 1. Molten salt energy storage tank, 2. Feed port, 3. Control terminal, 4. Molten salt electric heating to avoid corrosion contact structure, 41. Inner cylinder, 42. Heat conduction block, 43. Electric heating rod, 44. Connecting frame, 45. Heat-insulating wire, 5. Electric heater to reduce heat loss structure, 51. Cylinder, 52. Extension frame, 53. Top plate, 54. Steel cable, 6. Molten salt energy storage heat exchange structure, 61. Water inlet pipe, 62. Heat exchange pipe, 63. Heat exchange pump, 64. Fixing hoop, 7. Molten salt feeding and discharging structure, 71. Discharge pipe, 72. Discharge valve, 73. Feeding pipe. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings:

[0023] Example 1:

[0024] See also Figure 1-6 : In this embodiment, a molten salt energy storage electric heating system includes a molten salt energy storage tank 1, a feed port 2 and a control terminal 3. The control terminal 3 is controlled by a common computer remote circuit on the market. The control terminal 3 can transmit the low-voltage electricity at night to the electric heating rod 43 below for power supply and heating. The feed port 2 is fixedly opened at the top of the molten salt energy storage tank 1. The feed port 2 is made of stainless steel material and is surrounded by the top opening of the molten salt energy storage tank 1. A sealing cover body of matching size is provided above the feed port 2. The sealing cover can be buckled on the top of the feed port 2 at any time, and the sealing cover is made of high-strength stainless steel metal with a rubber ring, and a hole is reserved on the sealing cover for passing the steel cable 54 and the heat-insulating wire 45. The interior of the molten salt energy storage tank 1 is provided with a molten salt electric heating to avoid corrosion contact structure 4, and the top of the molten salt energy storage tank 1 is provided with an electric heater to reduce heat loss structure 5, the inner end of the molten salt energy storage tank 1 is provided with a molten salt energy storage heat exchange structure 6, and the outer wall of the molten salt energy storage tank 1 is provided with a molten salt feeding and discharging structure 7.

[0025] The molten salt electric heating to avoid corrosion contact structure 4 includes an inner cylinder 41 and a connecting frame 44. The inner cylinder 41 is fixedly installed inside the molten salt energy storage tank 1. The outer wall of the inner cylinder 41 is fixedly connected to a plurality of heat-conducting blocks 42. The heat-conducting blocks 42 are made of a plurality of heat-conducting strips made of aluminum nitride metal material. The electric heating rod 43 is vertically inserted into the inner cylinder 41. The heat generated after the electric heating rod 43 is connected to the power supply will first be transmitted to the heat-conducting block 42, and then the heat-conducting block 42 will transmit the heat to the molten salt material outside the inner cylinder 41 for heating and energy storage. The inner walls of the plurality of heat-conducting blocks 42 are movably connected to the electric heating rod 43, and the connecting frame 44 is fixedly installed on the top of the electric heating rod 43. The top of the connecting frame 44 is fixedly connected to an insulating wire 45. The insulating wire 45 is made of an electric cable wrapped with rock wool material on the outside, which can perform normal power supply work inside the molten salt energy storage tank 1 for high-temperature energy storage;

[0026] The heat-conducting block 42 is made of a plurality of heat-conducting strips made of aluminum nitride metal material, and the electric heating rod 43 is vertically inserted into the inner tube 41. The heat generated by the electric heating rod 43 after being connected to the power supply will first be transmitted to the heat-conducting block 42, and then the heat-conducting block 42 will transmit the heat to the molten salt material outside the inner tube 41 for heating and energy storage. The heat-insulating wire 45 is made of an electric cable wrapped with rock wool material on the outside, which can perform normal power supply work inside the molten salt energy storage tank 1 for high-temperature energy storage. In this way, through the establishment of the inner tube and the heat-conducting block, the metal heating rod will not directly contact the high-temperature molten salt, reducing the corrosion and damage to the metal heating rod, improving the service life of the electric heating result, and indirectly reducing the use cost investment of the molten salt energy storage electric heating system.

[0027] The electric heater heat loss reduction structure 5 includes a cylinder 51 and a steel cable 54. The two cylinders 51 are fixedly installed on the top of the molten salt energy storage tank 1. A top plate 53 is fixedly connected to the top of the two cylinders 51. An extension frame 52 is fixedly connected to one side of the top of the two cylinders 51. The extension frame 52 uses an oblique support reinforcement method to support the top plate 53 on the top of the cylinder 51. Two steel cables 54 are fixedly connected to the bottom of the top plate 53. The steel cables 54 are made of high-toughness and high-strength carbon steel metal material. The steel cables 54 can be welded to the bottom connecting frame 44. The connecting frame 44 can drive the inner electric heating rod 43 to be pulled upward in the inner tube 41, and the power is connected to start the cylinder 51.

[0028] The cylinder 51 can drive the top plate 53 to move up or down in two ways. Lifting the top plate 43 upward can pull out the electric heating rod 43 for easy maintenance and replacement. The top plate 53 moving downward in the opposite direction can fall to the top of the feed port 2, closing the feed port 2, so that the electric heating rod 43 is completely inside the molten salt energy storage tank 1 to work, minimizing heat loss during heating. When the electric heating rod 43 is fully inserted into the inner cylinder 41, the side edges of the two extension frames 52 are fixedly connected to the bottom of the top plate 53, the outer sides of the two steel cables 54 are movably connected to the inside of the feed port 2, and the bottom ends of the two steel cables 54 are fixedly connected to the top of the connecting frame 44. The control terminal 3 is fixedly installed above the top plate 53, and the bottom of the control terminal 3 is connected to the heat-insulating wire 45;

[0029] The extension frame 52 uses an oblique support reinforcement method to support the top plate 53 on the top of the cylinder 51. The steel cable 54 is made of high-toughness and high-strength carbon steel metal material. The steel cable 54 can be welded to the bottom end connecting frame 44. The connecting frame 44 can drive the inner electric heating rod 43 to be pulled out upward in the inner tube 41. Connect the power supply to start the cylinder 51. The cylinder 51 can drive the top plate 53 to move up or down. Lifting the top plate 43 upward can pull out the electric heating rod 43 for easy maintenance and replacement. The top plate 53 moving downward in the opposite direction can fall to the top of the feed port 2, closing the feed port 2, so that the electric heating rod 43 is completely in the molten salt energy storage tank 1 to work, minimizing heat loss during heating and improving the energy storage effect of the molten salt energy storage electric heating system.

[0030] Working principle:

[0031] The molten salt energy storage electric heating system adds molten salt to the molten salt storage tank. During the night when electricity consumption is low, the molten salt is heated using electricity, which is converted into thermal energy for storage. During the day when electricity consumption is peak, the stored heat is extracted through steam heat exchange, and the high-temperature steam or water is used to drive the generator to supplement the electricity consumption during the daytime peak period.

[0032] Low-cost heating structure of molten salt energy storage electric heating system:

[0033] The heat-conducting block 42 is made of a plurality of heat-conducting strips made of aluminum nitride metal material, and the electric heating rod 43 is vertically inserted into the inner tube 41. The heat generated by the electric heating rod 43 after being connected to the power supply will first be transmitted to the heat-conducting block 42, and then the heat-conducting block 42 will transmit the heat to the molten salt material outside the inner tube 41 for heating and energy storage. The heat-insulating wire 45 is made of an electric cable wrapped with rock wool material on the outside, which can perform normal power supply work inside the molten salt energy storage tank 1 for high-temperature energy storage. In this way, through the establishment of the inner tube and the heat-conducting block, the metal heating rod will not directly contact the high-temperature molten salt, reducing the corrosion and damage to the metal heating rod, improving the service life of the electric heating result, and indirectly reducing the use cost investment of the molten salt energy storage electric heating system.

[0034] Internal heating of the molten salt energy storage electric heating system reduces heat loss structure:

[0035] The extension frame 52 uses an oblique support reinforcement method to support the top plate 53 on the top of the cylinder 51. The steel cable 54 is made of high-toughness and high-strength carbon steel metal material. The steel cable 54 can be welded to the bottom end connecting frame 44. The connecting frame 44 can drive the inner electric heating rod 43 to be pulled out upward in the inner tube 41. Connect the power supply to start the cylinder 51. The cylinder 51 can drive the top plate 53 to move up or down. Lifting the top plate 43 upward can pull out the electric heating rod 43 for easy maintenance and replacement. The top plate 53 moving downward in the opposite direction can fall to the top of the feed port 2, closing the feed port 2, so that the electric heating rod 43 is completely in the molten salt energy storage tank 1 to work, minimizing heat loss during heating and improving the energy storage effect of the molten salt energy storage electric heating system.

[0036] Example 2:

[0037] See also Figure 1-6 : In this embodiment, a molten salt energy storage electric heating system also includes a molten salt energy storage heat exchange structure 6 including a water inlet pipe 61 and a fixing hoop 64. A plurality of fixing hoops 64 are fixedly connected to one side of the inner wall of the molten salt energy storage tank 1. Two fixing hoops 64 are arranged side by side. The fixing hoop 64 can vertically support the water inlet pipe 61 and the heat exchange pipe 62 on the inner side of the molten salt energy storage tank 1. The outer sides of the plurality of fixing hoops 64 are fixedly sleeved with a water inlet pipe 61. The end of the water inlet pipe 61 is connected to an external water source. The water inlet pipe 61 can transport cold water to the inside of the molten salt energy storage tank 1 that stores heat, and then the cold water The molten salt that encounters high-temperature heat storage will be heated and eventually discharged outward along the upper heat exchange pipe 62. The discharged hot water can be connected to an external power generation device, and the hot water vapor is used to drive the generator to generate electricity. One end of the water inlet pipe 61 is connected to the outer wall of the molten salt energy storage tank 1, and the other end of the water inlet pipe 61 is fixedly connected to the heat exchange pipe 62. The outer side of the heat exchange pipe 62 is fixedly connected to the outer wall of the molten salt energy storage tank 1. A heat exchange pump 63 is fixedly installed on the outside of the heat exchange pipe 62. After the heat exchange pump 63 is connected to the power supply and started, it can pump cold water along the water inlet pipe 61 to the heat exchange pipe 62 for discharge.

[0038] The molten salt feeding and discharging structure 7 includes a discharge pipe 71 and a feeding pipe 73. The feeding pipe 73 is fixedly connected to the upper outer wall of the molten salt energy storage tank 1. When the molten salt stored in the molten salt energy storage tank 1 needs to be replaced or replenished as the use process becomes longer, the molten salt raw materials can be replenished directly along the feeding pipe 71. The feeding pipe 71 is fixedly connected to the lower outer wall of the molten salt energy storage tank 1. Similarly, when the discharge valve 72 is opened, the discharge pipe 71 can discharge the molten salt material that has reached the end of its service life for recycling and processing. A discharge valve 72 is fixedly installed on the inner side of the discharge pipe 71.

[0039] Working principle:

[0040] Two fixing hoops 64 are arranged side by side, and the fixing hoops 64 can vertically support the water inlet pipe 61 and the heat exchange pipe 62 on the inner side of the molten salt energy storage tank 1. The end of the water inlet pipe 61 is connected to an external water source. The water inlet pipe 61 can transport cold water to the inside of the molten salt energy storage tank 1 that stores heat. Then the cold water will be heated when it encounters the high-temperature molten salt that stores heat, and finally discharged outward along the upper heat exchange pipe 62. The discharged hot water can be connected to an external power generation device, and the hot water vapor is used to drive the generator to generate electricity. A heat exchange pump 63 is fixedly installed on the outside of the heat exchange pipe 62. After the heat exchange pump 63 is connected to the power supply and started, the cold water can be pumped along the water inlet pipe 61 to the heat exchange pipe 62 for discharge.

[0041] The feeding pipe 73 is fixedly connected to the upper part of the outer wall of the molten salt energy storage tank 1. When the molten salt stored in the molten salt energy storage tank 1 needs to be replaced or replenished as the use process becomes longer, the molten salt raw materials can be replenished directly along the feeding pipe 71. The feeding pipe 71 is fixedly connected to the lower part of the outer wall of the molten salt energy storage tank 1. Similarly, when the discharge valve 72 is opened, the discharge pipe 71 can discharge the molten salt material that has reached the end of its service life for recycling.

[0042] While the present invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A molten salt energy storage electric heating system, comprising a molten salt energy storage tank (1), a feed port (2) and a control terminal (3), wherein the feed port (2) is fixedly opened at the top of the molten salt energy storage tank (1), and is characterized in that: The interior of the molten salt energy storage tank (1) is provided with a molten salt electric heating and corrosion-avoiding contact structure (4), the upper part of the molten salt energy storage tank (1) is provided with an electric heater and a heat loss reduction structure (5), the inner end of the molten salt energy storage tank (1) is provided with a molten salt energy storage and heat exchange structure (6), the outer wall of the molten salt energy storage tank (1) is provided with a molten salt feeding and discharging structure (7), the molten salt electric heating and corrosion-avoiding contact structure (4) comprises an inner tube (41) and a connecting frame (44), the inner tube (41) is fixedly installed in the interior of the molten salt energy storage tank (1), the outer wall of the inner tube (41) is fixedly connected with a plurality of heat-conducting blocks (42), the inner walls of the plurality of heat-conducting blocks (42) are movably connected with electric heating rods (43), the connecting frame (44) is fixedly installed on the top of the electric heating rod (43), and the upper part of the connecting frame (44) is fixedly connected with a heat-insulating wire (45).

2. The molten salt energy storage electric heating system according to claim 1, characterized in that: The electric heater heat loss reduction structure (5) comprises a cylinder (51) and a steel cable (54), wherein the two cylinders (51) are fixedly mounted on the top of the molten salt energy storage tank (1), a top plate (53) is fixedly connected above the two cylinders (51), an extension frame (52) is fixedly connected to one side of the top of the two cylinders (51), and two steel cables (54) are fixedly connected to the bottom of the top plate (53).

3. The molten salt energy storage electric heating system according to claim 2, characterized in that: The sides of the two extension frames (52) are fixedly connected to the bottom of the top plate (53), the outer sides of the two steel cables (54) are movably connected to the inside of the feed port (2), the bottom ends of the two steel cables (54) are fixedly connected to the top of the connecting frame (44), the control terminal (3) is fixedly installed above the top plate (53), and the bottom of the control terminal (3) is connected to the heat-insulating wire (45).

4. The molten salt energy storage electric heating system according to claim 1, characterized in that: The molten salt energy storage heat exchange structure (6) comprises a water inlet pipe (61) and a fixing hoop (64), wherein a plurality of the fixing hoops (64) are fixedly connected to one side of the inner wall of the molten salt energy storage tank (1), and the outer sides of the plurality of the fixing hoops (64) are fixedly sleeved with the water inlet pipe (61), one end of the water inlet pipe (61) is connected to the outer wall of the molten salt energy storage tank (1), and the other end of the water inlet pipe (61) is fixedly connected to the heat exchange pipe (62), the outer side of the heat exchange pipe (62) is fixedly connected to the outer wall of the molten salt energy storage tank (1), and the outside of the heat exchange pipe (62) is fixedly installed with a heat exchange pump (63).

5. The molten salt energy storage electric heating system according to claim 1, characterized in that: The molten salt feeding and discharging structure (7) comprises a discharge pipe (71) and a feeding pipe (73), wherein the feeding pipe (73) is fixedly connected to the upper side of the outer wall of the molten salt energy storage tank (1), and the discharge pipe (71) is fixedly connected to the lower side of the outer wall of the molten salt energy storage tank (1), and a discharge valve (72) is fixedly installed on the inner side of the discharge pipe (71).

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