A quicksand thermal storage system coupled with solar energy storage and its operation method

Abstract

This invention discloses a quicksand thermal storage system coupled with solar energy and its operation method. An electronic control system controls a flipping device to flip the sand thermal storage device, causing the sand medium within the storage structure to flow from the top to the bottom. An electromagnetic heating coil, controlled by the electronic control system, heats the sand medium flowing through the center of the storage structure. A solar collector at the top of the sand thermal storage device heats the sand medium at the top of the storage structure and collects solar energy. Utilizing the off-peak hours of the power grid at night, low-cost electricity is converted into heat energy and stored in the quicksand system, transferring daytime loads. Simultaneously, during the day when solar energy is abundant, solar energy is used to assist in heating the quicksand, ensuring sufficient heating while further saving energy consumption, reducing operating costs, balancing the power grid load, and significantly improving the quality of power grid operation.

Description

Technical Field

[0001] This invention relates to the fields of new energy consumption and off-peak electricity thermal storage technology, and in particular to a quicksand thermal storage system coupled with solar thermal storage and its operation method. Background Technology

[0002] With the transformation of the energy structure and the increasing demands for energy conservation and emission reduction technologies, the proportion of clean energy supply is constantly rising. Especially after large-scale grid connection, this has brought significant challenges to the dispatch and operation of the power system, creating considerable pressure on energy consumption. Currently, the problem of clean energy consumption in my country exhibits a relatively obvious characteristic of concentrated distribution during certain periods. Wind and solar power curtailment is particularly prevalent during the winter heating season and nighttime off-peak hours. Therefore, developing efficient energy storage technologies has become the core and key to solving the problem of new energy consumption and promoting the transformation of the national energy structure.

[0003] Currently existing thermal energy storage technologies are divided into hydrothermal storage and solid thermal energy storage (such as refractory bricks and lava). However, hydrothermal storage not only consumes a large amount of electricity, but also has low energy density due to the limited temperature of hydrothermal storage, resulting in insufficient energy release. Solid thermal energy storage materials are magnesia bricks or magnesia-iron composite refractory bricks produced from magnesia or iron ore. They have low energy density, low temperature resistance, are prone to pulverization after long-term use, and cause serious pollution during the production process. Moreover, the environmental conditions for use are harsh, and the environment must be dry.

[0004] Therefore, there is an urgent need to develop a thermal storage system and method that, compared to other thermal storage methods, achieves both low energy storage cost and high thermal storage efficiency without being limited by environmental conditions. Summary of the Invention

[0005] This invention provides a quicksand thermal storage system coupled with solar thermal storage and its operation method to overcome the above-mentioned technical problems.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] A quicksand thermal storage system coupled with solar thermal storage includes a flipping device, a support and positioning device, and a sand thermal storage device; the sand thermal storage device is connected to the flipping device, which can drive it to flip; the flipping device is rotatably connected to the support and positioning device, the sand thermal storage device is set at the center of the support and positioning device through the flipping device, and the flipping device can drive the sand thermal storage device to flip inside the support and positioning device.

[0008] The sand thermal storage device includes a sand storage body structure, a solar collector, and an electromagnetic heating coil; the inner wall of the sand storage body structure is provided with a heat insulation layer, and the solar collectors are symmetrically arranged at both ends of the sand storage body structure to form a sealed cavity; the electromagnetic heating coil is located at the center of the sand storage body structure and is fixedly installed on the heat insulation layer; the electromagnetic heating coil and the flipping device are respectively connected to the electrical control system.

[0009] The electrical control system drives the sand storage thermal device to flip by controlling the flipping device, so that the sand medium in the sand storage body structure flows from the top to the bottom of the sand storage body structure, and the electromagnetic heating coil is controlled by the electrical control system to heat the sand medium flowing through the center of the sand storage body structure.

[0010] The solar collector at the top of the sand thermal storage device collects solar energy, and the solar collector at the top of the sand thermal storage device also assists in heating the sand medium at the top of the sand storage body structure.

[0011] Furthermore, the sand storage body structure includes a top structural component, a middle structural component, and a bottom structural component;

[0012] The top, middle, and bottom structural components are sequentially fixedly connected to form an hourglass structure, and the electromagnetic heating coil is located inside the sand storage body structure and is positioned opposite to the middle structural component.

[0013] Furthermore, the flipping device includes a drive motor, a rotating roller, and a connecting rod;

[0014] The connecting rods are symmetrically arranged on both sides of the sand storage body structure, and the two ends of the connecting rods are fixedly connected to the top structural component and the bottom structural component, respectively.

[0015] The connecting rod is rotatably connected to the support and positioning device via a rotating roller, and the drive motor is connected to the rotating roller on one side of the sand storage body structure.

[0016] Furthermore, the support positioning device includes a U-shaped frame, an electric limit switch, and a limiting component;

[0017] The electric limit switch is located at the center of the bottom end of the U-shaped frame, and the limiting component is fixedly installed at the center of the solar collector, with the electric limit switch and the limiting component being positioned opposite each other.

[0018] Furthermore, it also includes a sand heat release device connected to the sand heat storage device; the sand heat release device includes a spiral heat exchange tube, a metal hose, a circulating water pump, and a filter;

[0019] The spiral heat exchange tube includes a first heat exchange branch tube and a second heat exchange branch tube, and the first heat exchange branch tube and the second heat exchange branch tube are symmetrically arranged inside the top and bottom structural components of the sand storage body structure.

[0020] The water inlet end of the first heat exchange branch pipe is connected to one end of the first metal hose through the first water inlet pipe, and the other end of the first metal hose is connected in sequence to a circulating water pump, a filter, a first on / off valve and a heat exchange medium storage device through a pipeline.

[0021] A first thermometer is provided between the other end of the first metal hose and the circulating water pump; and a first electric valve is provided on the first water inlet pipe between one end of the first metal hose and the water inlet end of the first heat exchange branch pipe.

[0022] The outlet end of the first heat exchange branch pipe is connected to one end of the second metal hose through the first outlet pipe, and the other end of the second metal hose is connected to the second on / off valve and the heat exchange medium storage device in sequence through the pipeline.

[0023] A second thermometer is provided between the other end of the second metal hose and the second on / off valve; and a first check valve is provided on the first water outlet pipe between one end of the second metal hose and the water outlet end of the first heat exchange branch pipe.

[0024] The water inlet end of the second heat exchange branch pipe is connected to one end of the first metal hose through the second water inlet pipe, and the second water inlet pipe is equipped with a second electric valve;

[0025] The outlet end of the second heat exchange branch pipe is connected to one end of the second metal hose through the second outlet pipe, and a second check valve is provided on the second outlet pipe.

[0026] Furthermore, both the top and bottom structural components are equipped with several temperature sensors.

[0027] Furthermore, each temperature sensor is set at equal intervals along the vertical direction.

[0028] An operation method for a quicksand thermal storage system coupled with solar energy storage includes the following steps:

[0029] Step S1: Divide the electricity consumption time periods according to the power grid load; the electricity consumption time periods include peak periods, flat periods, and valley periods;

[0030] If the coupled solar thermal storage system is in a valley period, then step S2 is executed; if the coupled solar thermal storage system is in a peak or flat period, then step S3 is executed.

[0031] Step S2: Turn on the flipping device and the electromagnetic heating coil. The flipping device will flip the sand thermal storage device clockwise so that all the heat storage medium in the sand thermal storage device is located in the top structural component of the sand thermal storage device.

[0032] The heat storage medium in the top structure flows to the bottom structure under the action of gravity, and the heat storage medium is heated by an electromagnetic heating coil during the flow to the bottom structure.

[0033] When all the heat storage medium in the top structure is transferred to the bottom structure, the electronic control system controls the flipping device to flip the sand heat storage device counterclockwise; the top structure and the bottom structure are swapped, and the heat storage medium in the current top structure flows to the current bottom structure under the action of gravity, and the heat storage medium is heated by the electromagnetic heating coil during the flow to the bottom structure.

[0034] The system will stop operating when each of the temperature sensors measures that the heat storage medium reaches the first preset temperature threshold.

[0035] Step S3: Connect the light sensor to the electronic control system. When the light sensor exceeds the preset light intensity threshold, the solar collector on the top structure collects and stores solar heat. Turn on the flipping device and the electromagnetic heating coil. The flipping device flips the sand storage device clockwise so that all the heat storage medium in the sand storage device is located in the current top structure after the sand storage device is flipped.

[0036] The heat storage medium in the top structure flows to the bottom structure under the action of gravity, and the solar collector on the top structure begins to collect and store solar heat.

[0037] The heat storage medium is heated by an electromagnetic heating coil as it flows toward the bottom structure; and the heat storage medium inside the top structure is further heated by the solar energy stored in the solar collector on the top structure.

[0038] After all the heat storage medium in the top structure is transferred to the bottom structure, the electronic control system controls the flipping device to flip the sand heat storage device counterclockwise; after the top structure and the bottom structure are swapped, the heat storage medium in the current top structure flows to the current bottom structure under the action of gravity.

[0039] Furthermore, the solar collector on the top structure collects solar heat and supplements the heat storage medium within the top structure with additional heat until the temperature sensors measure that the heat storage medium reaches a preset temperature threshold; then the system stops operating.

[0040] Step S4: After the coupled solar thermal storage system has completed thermal storage, the heat release mode is set through the electronic control system according to the current usage requirements;

[0041] The heat release mode includes normal heat exchange mode and rapid heat exchange mode;

[0042] If the normal heat exchange mode is used, then step S5 is executed; if the rapid heat exchange mode is used, then step S6 is executed.

[0043] Step S5: Open the first on / off valve, the second on / off valve, the circulating water pump, and the second electric valve in the sand heat release device to filter the heat exchange medium in the heat exchange medium storage device through the filter; the circulating water pump will transport the filtered heat exchange medium to the second heat exchange branch pipe through the first metal hose and the second water inlet pipe in sequence for heat exchange.

[0044] After heat exchange, the heat exchange medium returns to the heat exchange medium storage device through the second outlet pipe and the second metal hose, forming a side-closed circulation loop; when the temperature sensors detect that the sand heat storage medium is lower than the second preset temperature threshold, the sand heat release device is turned off, and the heat exchange ends.

[0045] Step S6: Activate the flipping device, which flips the sand thermal storage device clockwise, causing the heat storage medium in the top structure to flow to the bottom structure under gravity; then activate the first on / off valve, the second on / off valve, the circulating water pump, and the second electric valve, and filter the heat exchange medium in the heat exchange medium storage device through the filter; the circulating water pump delivers the filtered heat exchange medium sequentially through the first metal hose and the second water inlet pipe to the second heat exchange branch pipe for heat exchange.

[0046] When the heat storage medium in the top structure is completely transferred to the bottom structure, the electrical control system closes the second electric valve and opens the first electric valve; at the same time, the sand heat storage device is flipped counterclockwise by the flipping device to swap the top structure with the bottom structure; the circulating water pump delivers the filtered heat exchange medium to the first heat exchange branch pipe through the first metal hose and the first water inlet pipe for heat exchange.

[0047] After heat exchange, the heat exchange medium returns to the heat exchange medium storage device through the first outlet water pipe and the second metal hose, forming a side-closed circulation loop; when the temperature sensors detect that the sand heat storage medium is lower than the second preset temperature threshold, the sand heat release device is turned off, and the heat exchange ends.

[0048] Beneficial Effects: This invention provides a quicksand thermal storage system coupled with solar energy and its operation method. An electronic control system controls a flipping device to rotate the sand storage device, causing the sand medium within the storage structure to flow from the top to the bottom. An electromagnetic heating coil, controlled by the electronic control system, heats the sand medium flowing through the center of the storage structure. A solar collector at the bottom of the sand storage device heats the sand medium flowing into the bottom of the structure, while a solar collector at the top collects solar energy. Utilizing the off-peak hours of the power grid at night, low-cost electricity is converted into heat energy and stored in the quicksand system, transferring daytime loads. Simultaneously, during the day when solar energy is abundant, solar energy is used to assist in heating the quicksand, ensuring sufficient heating while further saving energy consumption, reducing operating costs, balancing the power grid load, and significantly improving the quality of power grid operation. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This is a schematic diagram of a quicksand thermal storage system coupled with solar energy storage according to the present invention.

[0051] Figure 2 This is a flowchart illustrating the operation method of a quicksand thermal storage system coupled with solar energy storage according to the present invention.

[0052] In the diagram: 1. Tilting device; 11. Drive motor; 12. Rotating roller; 13. Connecting rod; 2. Support and positioning device; 21. U-shaped frame; 22. Electric limit switch; 23. Limiting component; 3. Sand thermal storage device; 31. Sand storage body structure; 311. Top structural component; 312. Middle structural component; 313. Bottom structural component; 32. Solar collector; 33. Electromagnetic heating coil; 34. Insulation layer; 4. Sand heat release device; 41. Spiral heat exchange tube; 411. First heat exchange branch pipe; 4111. First water inlet pipe. 4112, First water outlet pipe; 412, Second heat exchange branch pipe; 4121, Second water inlet pipe; 4122, Second water outlet pipe; 42, Metal flexible hose; 421, First metal flexible hose; 422, Second metal flexible hose; 43, Circulating water pump; 44, Filter; 45, First on / off valve; 46, Second on / off valve; 47, First thermometer; 48, Second thermometer; 49, First electric valve; 50, Second electric valve; 51, First check valve; 52, Second check valve; 53, Temperature sensor. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] This embodiment provides a quicksand thermal storage system coupled with solar thermal storage, such as... Figure 1 As shown, it includes a flipping device 1, a support and positioning device 2, and a sand thermal storage device 3; the sand thermal storage device 3 is connected to the flipping device 1, which can drive it to flip; the flipping device 1 is rotatably connected to the support and positioning device 2, the sand thermal storage device 3 is set at the center position of the support and positioning device 2 through the flipping device 1, and the flipping device 1 can drive the sand thermal storage device 3 to flip inside the support and positioning device 2.

[0055] The sand storage thermal device 3 includes a sand storage body structure 31, a solar collector 32, and an electromagnetic heating coil 33. The inner wall of the sand storage body structure 31 is provided with a heat insulation layer 34, and the solar collectors 32 are symmetrically arranged at both ends of the sand storage body structure 31 to form a sealed cavity. The electromagnetic heating coil 33 is located at the center of the sand storage body structure 31 and is fixedly installed on the heat insulation layer 34. The electromagnetic heating coil 33 and the flipping device 1 are respectively connected to the electrical control system.

[0056] The electronic control system drives the sand storage heat storage device 3 to flip by controlling the flipping device 1, so that the sand medium in the sand storage body structure 31 flows from the top end to the bottom end of the sand storage body structure 31, and the electromagnetic heating coil 33 is controlled by the electronic control system to heat the sand medium flowing through the center position of the sand storage body structure 31.

[0057] The solar collector 32 at the top of the sand thermal storage device 3 collects solar energy, and the solar collector 32 at the top of the sand thermal storage device 3 assists in heating the sand medium at the top of the sand storage body structure 31.

[0058] Solid thermal storage is widely used due to its advantages of high thermal density and small footprint. Sand, as a thermal storage material, is an ideal medium for thermal storage because it is easy to fluidize, has high thermal stability, is readily available, abundant, inexpensive, and requires no processing. This invention discloses a quicksand thermal storage device 3 coupled with solar thermal storage. It utilizes the off-peak hours of the power grid at night to convert low-cost electricity into heat energy and store it in the quicksand system, thereby reducing the daytime load. At the same time, during the day when solar energy is abundant, it uses solar energy to assist in heating the quicksand, ensuring sufficient heat supply while further saving energy consumption, reducing operating costs, and balancing the power grid load.

[0059] In a specific embodiment, the sand storage body structure 31 includes a top structural member 311, a middle structural member 312, and a bottom structural member 313. The top structural member 311, the middle structural member 312, and the bottom structural member 313 are sequentially fixedly connected to form an hourglass structure, and the electromagnetic heating coil 33 is disposed inside the sand storage body structure 31 and is positioned opposite to the middle structural member 312. Preferably, the sand storage body structure 31 is an hourglass structure that allows the sand medium to flow quantitatively through the electromagnetic heating coil 33, enabling the sand medium to be heated sufficiently and uniformly.

[0060] In a specific embodiment, the flipping device 1 includes a drive motor 11, a rotating roller 12, and a connecting rod 13. The connecting rod 13 is symmetrically arranged on both sides of the sand storage body structure 31, and the two ends of the connecting rod 13 are fixedly connected to the top structural member 311 and the bottom structural member 313, respectively. The connecting rod 13 is rotatably connected to the support positioning device 2 through the rotating roller 12, and the drive motor 11 is connected to the rotating roller 12 on one side of the sand storage body structure 31. The drive motor 11 drives the connecting rod 13 on one side of the sand storage body structure 31 to rotate through the rotating roller 12, thereby causing the connecting rod 13 on the other side of the sand storage body structure 31 to rotate relative to the support positioning device 2 through the rotating roller 12.

[0061] In a specific embodiment, the support and positioning device 2 includes a U-shaped frame 21, an electric limit switch 22, and a limiting member 23. The electric limit switch 22 is located at the center of the bottom end of the U-shaped frame 21, and the limiting member 23 is fixedly installed at the center of the solar collector 32. The solar collector 32 is preferably circular, and the electric limit switch 22 and the limiting member 23 are arranged opposite to each other. The electric limit switch 22 and the limiting member 23 are positioned and fixed by electro-induction. The support and positioning device 2 ensures the accuracy of the initial position of the sand storage body structure 31 or the stopping position of the sand storage body structure 31 after being flipped by the flipping device 1. That is, the central axis of the sand storage body structure 31 is perpendicular to the plane where the bottom end of the U-shaped frame 21 is located, so that the sand medium at the top of the sand storage body structure 31 flows down smoothly. The working principle and method between the electric limit switch 22 and the limiting member 23 are existing known technologies and are not the inventive point of this application, and will not be described in detail here.

[0062] In a specific embodiment, it also includes a sand heat release device 4 connected to the sand heat storage device 3; the sand heat release device 4 includes a spiral heat exchange tube 41, a metal hose 42, a circulating water pump 43, and a filter 44;

[0063] The spiral heat exchange tube 41 includes a first heat exchange branch tube 411 and a second heat exchange branch tube 412, and the first heat exchange branch tube 411 and the second heat exchange branch tube 412 are symmetrically arranged inside the top structural member 311 and the bottom structural member 313 of the sand storage body structure 31; the water inlet end of the first heat exchange branch tube 411 is connected to one end of the first metal hose 421 through the first water inlet pipe 4111, and the other end of the first metal hose 421 is connected in sequence to a circulating water pump 43, a filter 44, a first on / off valve 45 and a heat exchange medium storage device through a pipeline; the other end of the first metal hose 421 is connected to the circulating water pump 43, a filter 44, a first on / off valve 45 and a heat exchange medium storage device. A first thermometer 47 is provided between the circulating water pumps 43; and a first electric valve 49 is provided on the first inlet pipe 4111 between one end of the first metal hose 421 and the inlet end of the first heat exchange branch pipe 411; the outlet end of the first heat exchange branch pipe 411 is connected to one end of the second metal hose 422 through the first outlet pipe 4112, and the other end of the second metal hose 422 is connected to the second on / off valve 46 and the heat exchange medium storage device through a pipeline; and the first on / off valve 45 and the second on / off valve 46 control the flow of the medium in the heat exchange medium storage device to ensure the smooth operation of the heat exchange system. A second thermometer 48 is provided between the other end of the second metal hose 422 and the second on / off valve 46; and a first check valve 51 is provided on the first outlet pipe 4112 between one end of the second metal hose 422 and the outlet end of the first heat exchange branch pipe 4111.

[0064] The water inlet end of the second heat exchange branch pipe 412 is connected to one end of the first metal hose 421 through the second water inlet pipe 4121, and the second water inlet pipe 4121 is provided with a second electric valve 50; the water outlet end of the second heat exchange branch pipe 412 is connected to one end of the second metal hose 422 through the second water outlet pipe 4122, and the second water outlet pipe 4122 is provided with a second check valve 52.

[0065] The spiral heat exchange tube 41 is divided into a first heat exchange branch tube 411 and a second heat exchange branch tube 412, which are symmetrically distributed in the upper and lower hourglass structures of the sand storage device. The first heat exchange branch tube 411 and the second heat exchange branch tube 412 are connected in parallel. The flow direction of the heat exchange medium is controlled by the opening and closing of the first electric valve 49 or the second electric valve 50. The first check valve 51 and the second check valve 52 are used to prevent the heat exchange medium from flowing back. One end of the first metal hose 421 is connected to the water inlet of the spiral heat exchange tube 41, and the other end is connected to the circulating water pump 43. One end of the second metal hose 422 is connected to the water outlet of the spiral heat exchange tube 41, and the other end is connected to the heat exchange medium storage device to form a heat exchange circulation loop. The metal hose 422 is also used to compensate for the positional movement of the pipeline during the clockwise or counterclockwise rotation of the sand heat storage device 3. Because it can be bent at will and the internal stress generated by bending under the rated bending radius is minimal, it greatly facilitates the rotation operation of the sand heat storage device 3 and plays a certain role in ensuring the safe operation of the pipeline system. The circulating water pump 43 is frequency-adjustable, which can quickly adjust the flow rate and velocity of the heat exchange medium-water according to the required heat exchange, making the heat exchange process convenient and controllable. The filter 44 is installed before the water inlet of the circulating water pump 43 to remove impurities in the water and extend the working life of the circulating water pump 43.

[0066] In a specific embodiment, both the top structural member 311 and the bottom structural member 313 are equipped with a plurality of temperature sensors 53; and each temperature sensor 53 is arranged at equal intervals along the vertical direction. Specifically, both the top structural member 311 and the bottom structural member 313 are equipped with three temperature sensors 53 (T1, T2, and T3). The temperature sensors 53 are used to monitor the temperature of the sand medium in the sand storage body structure 31 in real time and transmit the data to the electrical control system. The electrical control system can control the quicksand thermal storage system coupled with solar thermal storage based on the temperature monitored by the temperature sensors 53.

[0067] An operation method for a quicksand thermal storage system coupled with solar energy storage, such as... Figure 2 As shown, the process includes the following steps: S1: dividing the electricity consumption period into peak, flat, and valley periods according to the power grid load;

[0068] The division of peak, valley, and flat electricity consumption periods is generally as follows: Peak period: 08:30-11:30; 18:00-23:00; Flat period: 07:00-08:30; 11:30-18:00; Low period: 23:00-07:00. The day is divided into three periods, each preferably 8 hours long. Each power supply company can further define these periods based on its own seasonality and the timing of peak and valley loads.

[0069] If the coupled solar thermal storage system is in a valley period, then step S2 is executed; if the coupled solar thermal storage system is in a peak or flat period, then step S3 is executed.

[0070] Step S2: During the nighttime valley section, the electric heat storage device 1 and the electromagnetic heating coil 33 are turned on. The flipping device 1 flips the sand heat storage device 3 clockwise so that all the heat storage medium in the sand heat storage device 3 is located in the top structural component 311 of the sand heat storage device 3.

[0071] The heat storage medium in the top structural component 311, under the action of gravity, flows at a rate V (1.5~3m³). 3 / h) flows to the bottom structural member 313, and during the flow to the bottom structural member 313, the heat storage medium is heated by the electromagnetic heating coil 33;

[0072] When all the heat storage medium in the top structural component 311 is transferred to the bottom structural component 313, the electronic control system controls the flipping device 1 to flip the sand heat storage device 3 counterclockwise; the top structural component 311 and the bottom structural component 313 are swapped (i.e., the current top structural component 311 is flipped to the bottom to become the bottom structural component 313, and the current bottom structural component 313 is flipped to the top to become the top structural component 311), and the heat storage medium in the current top structural component 311 flows to the current bottom structural component 313 under the action of gravity, and the heat storage medium is heated by the electromagnetic heating coil 33 during the flow to the bottom structural component 313; the heat storage medium repeats the above flow heat absorption process, and the temperature sensor 53 monitors the temperature of the heat storage medium (sand medium) at all times; wherein, the timing and speed of the flipping of the flipping device 1 controlled by the electronic control system can be set by the electronic control system, and the procedure and method of setting by the electronic control system are existing known technologies and are not the inventive point of this application, and will not be described in detail here.

[0073] The system stops operating when the temperature sensors 53 measure that the heat storage medium reaches the first preset temperature threshold; that is, when the temperature sensors 53 detect that T1 = T2 = T3 = t0 (≥800℃); the electronic control system stops the above-mentioned flipping-flowing-heating process, the heat storage is completed, and the flipping device 1 and the electromagnetic heating coil 33 are turned off. The electronic control system includes an electromagnetic heating controller for controlling the electromagnetic heating coil 33. During this process, due to the continuous flipping of the sand heat storage device, the internal heat storage medium is always in a state of flowing heating, which greatly shortens the heat conduction time inside the sand and accelerates the temperature rise process.

[0074] Step S3: Connect the light sensor to the electronic control system. When the light sensor exceeds the preset light intensity threshold, and when the sunlight intensity is sufficient during the day, the solar collector 32 on the top structure 311 collects and stores solar heat. Activate the flipping device 1 and the electromagnetic heating coil 33. The flipping device 1 flips the sand heat storage device 3 clockwise, so that all the heat storage medium in the sand heat storage device 3 is located in the current top structure 311 after the sand heat storage device 3 is flipped. The structure and working principle of the solar collector 32 are existing technologies, such as simple concentrating glass, and are not the inventive point of this application, so they will not be described in detail here.

[0075] The heat storage medium in the top structure 311 flows to the bottom structure 313 under the action of gravity, and the solar collector 32 on the top structure 311 collects and stores solar heat.

[0076] The heat storage medium is heated by the electromagnetic heating coil 33 during its flow to the bottom structure 313; and the solar energy stored in the solar collector 32 on the top structure 311 is used to supplement the heating of the heat storage medium in the top structure 311.

[0077] After all the heat storage medium in the top structure 311 is transferred to the bottom structure 313, the electronic control system controls the flipping device 1 to flip the sand heat storage device 3 counterclockwise; after the top structure 311 and the bottom structure 313 are swapped, the heat storage medium in the current top structure 311 flows to the current bottom structure 313 under the action of gravity.

[0078] Furthermore, the solar collector 32 on the top structure 311 collects solar heat and supplements the heat storage medium inside the top structure 311; until the temperature sensors 53 measure that the heat storage medium reaches the preset temperature threshold; then the system stops operating.

[0079] Among them, the heat storage medium moves at a velocity V (1.5~3m) under the action of gravity. 3 The sand storage medium flows downwards ( / h). After all the heat storage medium has been transferred, the electrical control system controls the flipping device 1 to reset the sand storage device 3, ensuring that the sand storage medium always flows downwards vertically from the top starting position, repeating the cycle. During the flipping process, the light contact surface of the heat storage medium changes continuously, and the sand body is heated evenly and rapidly. The above-mentioned flipping heat storage process can be carried out alone or simultaneously with the flipping heat release process (as follows), storing and supplying heat at the same time, supplementing heat supply. Among them, heat storage operation mode one and heat storage operation mode two can complement each other (the content in step S2 is essentially heat storage operation mode one, and the content in step S3 is essentially heat storage operation mode two), making full use of solar thermal resources, saving electricity loss, and under the national peak-valley electricity price policy, shaving peaks and filling valleys, balancing the power grid, and saving operating costs.

[0080] Step S4: After the coupled solar thermal storage system has completed thermal storage, the heat release mode is set through the electronic control system according to the current usage requirements;

[0081] The heat release mode includes normal heat exchange mode and rapid heat exchange mode;

[0082] If the normal heat exchange mode is used, then step S5 is executed; if the rapid heat exchange mode is used, then step S6 is executed.

[0083] Step S5: Open the first on / off valve 45, the second on / off valve 46, the circulating water pump 43, and the second electric valve 50 in the sand heat release device 4, and filter the heat exchange medium in the heat exchange medium storage device through the filter 44; the circulating water pump 43 transports the filtered heat exchange medium to the second heat exchange branch pipe 412 through the first metal hose 421 and the second water inlet pipe for heat exchange.

[0084] After heat exchange, the heat exchange medium returns to the heat exchange medium storage device through the second outlet pipe and the second metal hose 422, forming a side-closed circulation loop; when the temperature sensors 53 detect that the sand heat storage medium is lower than the second preset temperature threshold, the sand heat release device 4 is turned off, and the heat exchange ends.

[0085] The filtered heat exchange medium - water enters the second heat exchange branch pipe 412 of the spiral heat exchange pipe 41 under the action of the circulating water pump 43, and spirally flows upward in the second heat exchange branch pipe 412. During the flow, it exchanges heat with the high-temperature heat storage medium (sand medium) outside the pipe of the second heat exchange branch pipe 412. The heat exchange medium after heat exchange returns to the heat exchange medium storage device again, forming a heat exchange water circulation loop; wherein, the water flow rate and flow volume of the heat exchange medium are both adjustable, and it continuously absorbs heat while flowing in the heat exchange water circulation loop until the sand heat storage medium (sand medium) is lower than the second preset temperature threshold (i.e., TMAX(T1, T2, T3) < t1 (≤ 100°C)), at which point the heat exchange ends, and the above-mentioned switch is closed.

[0086] Step S6: Turn on the flipping device 1. The flipping device 1 rotates the sand heat storage device 3 clockwise, causing the heat storage medium in the top structural member 311 to flow towards the bottom structural member 313 under the action of gravity; then turn on the first opening and closing valve 45, the second opening and closing valve 46, the circulating water pump 43, and the second electric valve 50, and filter the heat exchange medium in the heat exchange medium storage device through the filter 44; the circulating water pump 43 conveys the filtered heat exchange medium to the second heat exchange branch pipe 412 through the first metal hose 421 and the second water inlet pipe for heat exchange.

[0087] When the heat storage medium in the top structural member 311 is completely transferred to the bottom structural member 313, the electronic control system closes the second electric valve 50 and turns on the first electric valve 49; at the same time, the flipping device 1 rotates the sand heat storage device 3 counterclockwise to swap the top structural member 311 and the bottom structural member 313; the circulating water pump 43 conveys the filtered heat exchange medium to the first heat exchange branch pipe 411 through the first metal hose 421 and the first water inlet pipe 4111 for heat exchange.

[0088] The heat exchange medium after heat exchange returns to the heat exchange medium storage device through the first water outlet pipe 4112 and the second metal hose 422 in sequence, forming a side closed circulation loop; when each temperature sensor 53 measures that the sand heat storage medium is lower than the second preset temperature threshold, the sand heat release device 4 is closed, and the heat exchange ends.

[0089] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A quicksand thermal storage system coupled with solar energy storage, characterized in that, It includes a flipping device (1), a support and positioning device (2), and a sand thermal storage device (3); the sand thermal storage device (3) is connected to the flipping device (1) which can drive it to flip; the flipping device (1) is rotatably connected to the support and positioning device (2), the sand thermal storage device (3) is set at the center of the support and positioning device (2) through the flipping device (1), and the flipping device (1) can drive the sand thermal storage device (3) to flip inside the support and positioning device (2); The sand storage thermal device (3) includes a sand storage body structure (31), a solar collector (32), and an electromagnetic heating coil (33); the inner wall of the sand storage body structure (31) is provided with a heat insulation layer (34), and the solar collector (32) is symmetrically arranged at both ends of the sand storage body structure (31) to form a closed cavity. The electromagnetic heating coil (33) is located at the center of the sand storage body structure (31) and is fixedly installed on the heat insulation layer (34); the electromagnetic heating coil (33) and the flipping device (1) are respectively connected to the electrical control system. The electrical control system drives the sand storage heat storage device (3) to flip by controlling the flipping device (1), and the electromagnetic heating coil (33) is controlled by the electrical control system to heat the sand medium flowing through the center of the sand storage body structure (31); The solar collector (32) at the top of the sand thermal storage device (3) collects solar energy, and the solar collector (32) at the top of the sand thermal storage device (3) assists in heating the sand medium at the top of the sand storage body structure (31).

2. The quicksand thermal storage system coupled with solar energy storage according to claim 1, characterized in that, The sand storage body structure (31) includes a top structural component (311), a middle structural component (312), and a bottom structural component (313). The top structural component (311), the middle structural component (312), and the bottom structural component (313) are sequentially fixedly connected to form an hourglass structure, and the electromagnetic heating coil (33) is located inside the sand storage body structure (31) and is positioned opposite to the middle structural component (312).

3. The quicksand thermal storage system coupled with solar thermal storage according to claim 1, characterized in that, The flipping device (1) includes a drive motor (11), a rotating roller (12), and a connecting rod (13). The connecting rods (13) are symmetrically arranged on both sides of the sand storage body structure (31), and the two ends of the connecting rods (13) are fixedly connected to the top structural component (311) and the bottom structural component (313) respectively. The connecting rod (13) is rotatably connected to the support positioning device (2) via a rotating roller (12), and the drive motor (11) is connected to the rotating roller (12) on one side of the sand storage body structure (31).

4. A quicksand thermal storage system coupled with solar thermal storage according to claim 1, characterized in that, The support positioning device (2) includes a U-shaped frame (21), an electric limit switch (22), and a limiting member (23); The electric limit switch (22) is located at the center of the bottom of the U-shaped frame (21), and the limiting member (23) is fixedly installed at the center of the solar collector (32), with the electric limit switch (22) and the limiting member (23) being arranged opposite to each other.

5. A quicksand thermal storage system coupled with solar thermal storage according to claim 1, characterized in that, It also includes a sand heat release device (4) connected to the sand heat storage device (3); the sand heat release device (4) includes a spiral heat exchange tube (41), a metal hose (42), a circulating water pump (43), and a filter (44). The spiral heat exchange tube (41) includes a first heat exchange branch tube (411) and a second heat exchange branch tube (412), and the first heat exchange branch tube (411) and the second heat exchange branch tube (412) are symmetrically arranged inside the top structural member (311) and the bottom structural member (313) of the sand storage body structure (31). The water inlet end of the first heat exchange branch pipe (411) is connected to one end of the first metal hose (421) through the first water inlet pipe (4111). The other end of the first metal hose (421) is connected in sequence to a circulating water pump (43), a filter (44), a first on / off valve (45), and a heat exchange medium storage device through a pipeline. A first thermometer (47) is provided between the other end of the first metal hose (421) and the circulating water pump (43); and a first electric valve (49) is provided on the first water inlet pipe (4111) between one end of the first metal hose (421) and the water inlet end of the first heat exchange branch pipe (411). The outlet end of the first heat exchange branch pipe (411) is connected to one end of the second metal hose (422) through the first outlet pipe (4112), and the other end of the second metal hose (422) is connected to the second on / off valve (46) and the heat exchange medium storage device in sequence through the pipeline. A second thermometer (48) is provided between the other end of the second metal hose (422) and the second on / off valve (46); and a first check valve (51) is provided on the first water outlet pipe (4112) between one end of the second metal hose (422) and the water outlet end of the first heat exchange branch pipe (411). The water inlet end of the second heat exchange branch pipe (412) is connected to one end of the first metal hose (421) through the second water inlet pipe (4121), and the second water inlet pipe (4121) is provided with a second electric valve (50). The outlet end of the second heat exchange branch pipe (412) is connected to one end of the second metal hose (422) through the second outlet pipe (4122), and a second check valve (52) is provided on the second outlet pipe (4122).

6. A quicksand thermal storage system coupled with solar thermal storage according to claim 2, characterized in that, Both the top structural member (311) and the bottom structural member (313) are provided with a number of temperature sensors (53). Furthermore, each temperature sensor (53) is set at equal intervals along the vertical direction.

7. An operation method for a quicksand thermal storage system coupled with solar thermal storage as described in claim 6, characterized in that, Includes the following steps; Step S1: Divide the electricity consumption time periods according to the power grid load; the electricity consumption time periods include peak periods, flat periods, and valley periods; If the coupled solar thermal storage system is in a valley period, then step S2 is executed; if the coupled solar thermal storage system is in a peak or flat period, then step S3 is executed. Step S2: Turn on the flipping device (1) and the electromagnetic heating coil (33). The flipping device (1) flips the sand heat storage device (3) clockwise so that all the heat storage medium in the sand heat storage device (3) is located in the top structural component (311) of the sand heat storage device (3). The heat storage medium in the top structure (311) flows to the bottom structure (313) under the action of gravity, and the heat storage medium is heated by the electromagnetic heating coil (33) during the flow to the bottom structure (313); When all the heat storage medium in the top structure (311) is transferred to the bottom structure (313), the electronic control system controls the flipping device (1) to flip the sand heat storage device (3) counterclockwise; the top structure (311) and the bottom structure (313) are swapped, and the heat storage medium in the current top structure (311) flows to the current bottom structure (313) under the action of gravity, and the heat storage medium is heated by the electromagnetic heating coil (33) during the flow to the bottom structure (313); The system stops operating when the temperature sensors (53) measure that the heat storage medium reaches the first preset temperature threshold. Step S3: Connect the light sensor to the electronic control system. When the light sensor exceeds the preset light intensity threshold, the solar collector (32) on the top structure (311) collects and stores solar heat. Turn on the flipping device (1) and the electromagnetic heating coil (33). The flipping device (1) flips the sand heat storage device (3) clockwise so that all the heat storage medium in the sand heat storage device (3) is located in the top structure (311) after the sand heat storage device (3) is flipped. The heat storage medium in the top structure (311) flows to the bottom structure (313) under the action of gravity, and the solar collector (32) on the top structure (311) begins to collect and store solar heat. The heat storage medium is heated by an electromagnetic heating coil (33) during its flow to the bottom structure (313); and the heat storage medium inside the top structure (311) is supplemented by the solar energy stored in the solar collector (32) on the top structure (311). After all the heat storage medium in the top structure (311) is transferred to the bottom structure (313), the electronic control system controls the flipping device (1) to flip the sand heat storage device (3) counterclockwise; after the top structure (311) and the bottom structure (313) are swapped, the heat storage medium in the current top structure (311) flows to the current bottom structure (313) under the action of gravity; The solar collector (32) on the top structure (311) collects solar heat and supplements the heat storage medium in the top structure (311) until the temperature sensors (53) measure that the heat storage medium reaches the preset temperature threshold; then the system stops running. Step S4: After the coupled solar thermal storage system has completed thermal storage, the heat release mode is set through the electronic control system according to the current usage requirements; The heat release mode includes normal heat exchange mode and rapid heat exchange mode; If the normal heat exchange mode is used, then step S5 is executed; if the rapid heat exchange mode is used, then step S6 is executed. Step S5: Open the first on / off valve (45), the second on / off valve (46), the circulating water pump (43), and the second electric valve (50) in the sand heat release device (4) to filter the heat exchange medium in the heat exchange medium storage device through the filter (44); the circulating water pump (43) transports the filtered heat exchange medium through the first metal hose (421) and the second water inlet pipe to the second heat exchange branch pipe (412) for heat exchange. After heat exchange, the heat exchange medium returns to the heat exchange medium storage device through the second outlet water pipe and the second metal hose (422) to form a side-closed circulation loop; when the temperature sensors (53) detect that the heat storage medium is lower than the second preset temperature threshold, the sand heat release device (4) is turned off and the heat exchange ends. Step S6: Turn on the flipping device (1), which flips the sand heat storage device (3) clockwise, so that the heat storage medium in the top structure (311) flows to the bottom structure (313) under the action of gravity; then turn on the first opening and closing valve (45), the second opening and closing valve (46), the circulating water pump (43) and the second electric valve (50), and filter the heat exchange medium in the heat exchange medium storage device through the filter (44); the circulating water pump (43) transports the filtered heat exchange medium to the second heat exchange branch pipe (412) through the first metal hose (421) and the second water inlet pipe for heat exchange. When the heat storage medium in the top structure (311) is completely transferred to the bottom structure (313), the electrical control system closes the second electric valve (50) and opens the first electric valve (49); at the same time, the sand heat storage device (3) is flipped counterclockwise by the flipping device (1) to swap the top structure (311) and the bottom structure (313); the circulating water pump (43) delivers the filtered heat exchange medium to the first heat exchange branch pipe (411) through the first metal hose (421) and the first water inlet pipe (4111) for heat exchange. After heat exchange, the heat exchange medium returns to the heat exchange medium storage device through the first outlet water pipe (4112) and the second metal hose (422) to form a side-closed circulation loop; when the temperature sensors (53) detect that the heat storage medium is lower than the second preset temperature threshold, the sand heat release device (4) is turned off and the heat exchange ends.

Images