Phase change energy storage and release device and method based on local excitation

Abstract

The present invention discloses a phase-change energy storage and release device and method based on local excitation, comprising an energy storage tank, wherein a plurality of phase-change energy storage units are connected in the energy storage tank via brackets arranged in parallel, a phase-change power trigger carrier is arranged directly above the phase-change energy storage unit, the phase-change power trigger carrier is connected to an electromagnet power drive module, the electromagnet power drive module is fixedly connected to the top of the energy storage tank, a carrier recovery device is arranged on one side of the top of the energy storage tank, and the carrier recovery device is connected to the phase-change power trigger carrier via a connecting rope; a first energy storage circulating water pump is connected to the top of one side of the energy storage tank via a connecting pipe, a second energy storage circulating water pump is connected to the bottom of one side of the energy storage tank via a connecting pipe, and a valve group is installed on the connecting pipe connecting the first energy storage circulating water pump and the second energy storage circulating water pump.

Description

Technical Field

[0001] The present invention relates to the technical field of phase change energy storage and release, and in particular to a phase change energy storage and release device and method based on local excitation. Background Art

[0002] In the field of phase change energy storage, sodium acetate trihydrate shows excellent performance, with a phase change temperature of 58°C and a phase change latent heat of 266 kj / kg, making it an ideal phase change thermal storage material for building heating and hot water supply. However, current research on the modification and triggered solidification of hydrated salt phase change materials is mainly based on small-volume research in test tubes or reagent bottles. In actual application to building heating and hot water supply systems, the amount of materials and the volume of the thermal storage unit are large, and there is little research on phase change energy storage systems and excitation energy release methods under large volumes. Therefore, the prior art requires a phase change energy storage release device to achieve the purpose of long-term heat storage, and requires a local excitation method to improve the efficiency of the phase change energy storage system when releasing energy. For this reason, we propose a phase change energy storage release device and method based on local excitation to solve the above problems. Summary of the invention

[0003] The object of the present invention is to provide a phase change energy storage and release device and method based on local excitation to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a phase change energy storage and release device based on local excitation, comprising an energy storage tank and an automatic control device, wherein a plurality of phase change energy storage units are connected in the energy storage tank through brackets arranged in parallel, a phase change power trigger carrier is arranged directly above the phase change energy storage unit, the phase change power trigger carrier is connected to an electromagnet power drive module, the electromagnet power drive module is fixedly connected to the top of the energy storage tank, a carrier recovery device is arranged on one side of the top of the energy storage tank, and the carrier recovery device is connected to the phase change power trigger carrier through a connecting rope;

[0005] A first energy storage circulating water pump is connected to the top of one side of the energy storage tank through a connecting pipe, and a second energy storage circulating water pump is connected to the bottom of one side of the energy storage tank through a connecting pipe. A valve group is installed on the connecting pipe connecting the first energy storage circulating water pump and the second energy storage circulating water pump, and the automatic control device is composed of multiple control units.

[0006] Preferably, the valve group consists of a number of valves numbered V1-V8.

[0007] Preferably, the energy storage tank is made of high-quality carbon steel and is coated with thermal insulation material on the outside. An internal monitoring device dedicated to the phase change energy storage and release device is fixedly installed in the energy storage tank and is composed of a temperature sensor, a liquid level sensor, etc.

[0008] Preferably, the material of the phase change energy storage unit is high-quality stainless steel and the inside is polished to form a smooth inner wall surface. The phase change energy storage unit is arranged in a multi-layer spaced stacking manner. The phase change energy storage unit is filled with a supersaturated sodium acetate trihydrate solution. The phase change energy storage unit is connected in the energy storage tank by a stainless steel pipe.

[0009] Preferably, the first energy storage circulating water pump and the second energy storage circulating water pump are respectively composed of two water pumps connected in parallel, and the first energy storage circulating water pump and the second energy storage circulating water pump respectively include an energy charging circulating water pump and an energy releasing circulating water pump.

[0010] Preferably, the phase change power trigger carrier is composed of a solid stainless steel ball.

[0011] Preferably, the carrier recovery device includes a support frame, which is fixedly connected to one side of the top of the energy storage tank, one side of the support frame is fixedly connected to a forward and reverse motor, the output shaft of the forward and reverse motor is fixedly connected to a winding roller, the winding roller is rotatably connected between the support frames, a connecting rope is wound around the winding roller, and the connecting rope slides into the energy storage tank and is fixedly connected to the phase change power trigger carrier.

[0012] The present invention also provides a method for a phase change energy storage and release device based on local excitation, comprising the following steps:

[0013] Step 1: Sodium acetate trihydrate is used as the phase change material of the phase change thermal storage system. The sodium acetate trihydrate phase change material brine ratio is determined by the drying method. After the fixed ratio solid powder determined by the drying method is mixed with water, the liquid sodium acetate trihydrate is filled into the phase change energy storage unit with a funnel, and the unit is sealed with a flange cover. After the packaging is completed, the unit is naturally cooled at an ambient temperature of 20°C to put the phase change energy storage unit in a supercooled energy storage state;

[0014] Step 2: Sodium acetate trihydrate is filled inside the phase change energy storage unit as a heat storage material and sealed with a flange cover with a rubber ring. In the energy storage stage, one side of the energy storage tank is a high-temperature water inlet and the other side is a low-temperature water outlet. The first energy storage circulating water pump and the second energy storage circulating water pump are connected in parallel as the energy storage water circulation transportation power, which are backed up for each other; in the energy release stage, one side of the energy storage tank is a low-temperature water inlet and the other side is a high-temperature water outlet. The first energy storage circulating water pump and the second energy storage circulating water pump are connected in parallel as the energy release water circulation transportation power, which are backed up for each other. The connection between each device and the pipeline is a flange connection;

[0015] Step 3: The energy storage process of the phase change energy storage system is to generate 83℃ heat source water through solar collectors or industrial waste heat, and pump it into the energy storage tank. Due to the heat loss along the pipeline, the water temperature drops to 82℃-75℃. After heat exchange with the phase change energy storage unit filled with sodium acetate trihydrate material in the energy storage tank, it flows back to the constant temperature water tank solar collector or industrial pipeline from the bottom outlet of the energy storage tank for low temperature use and repeats the cycle.

[0016] Step 4: The energy release process of the phase change energy storage system is to trigger the phase change power to trigger the carrier to fall freely from a specified height to generate knocking vibration, trigger the solidification of the supercooled solution in the phase change energy storage unit, and adsorb the electromagnet of the electromagnet power drive module on the top of the energy storage tank. The energy release process is given a signal by the automatic control device. The signal reaches the electromagnet power drive module, the current is disconnected, the magnetic field is reset, and the phase change power trigger carrier falls freely from a specified height to hit the phase change energy storage unit, triggering the supersaturated solution in the unit to phase change and release energy. After the triggering is completed, the signal given by the automatic control device reaches the carrier recovery device, the current is turned on, and the phase change power trigger carrier is recovered. After the process is completed, the automatic control device gives a signal, the signal reaches the electromagnet power drive module, the current in the coil is reset to generate a magnetic field, and the phase change power trigger carrier is adsorbed, so as to achieve the purpose of fully automatic phase change triggering and recovery in the system energy release process, and the energy data is collected and analyzed through the energy charging and release monitoring device inside the energy storage tank.

[0017] Preferably, the drying method is used to determine the moisture content of the phase change material as follows: weigh different masses of sodium acetate crystals in a weighing bottle using an electronic balance, place the bottle in an open electric blast drying oven at 105°C for heating and evaporation, cover the weighing bottle with a cap after 5 hours, move it to an environment to cool for 30 minutes, and weigh it, and calculate the evaporated water after 5 hours. Then the heating time is changed to 2 hours, and the above steps are repeated until the difference between the two weighings does not exceed 5 mg, and the solid powder is evaporated for use.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. Compared with the traditional phase change energy storage technology, the phase change energy storage and release device of the present invention utilizes the high latent heat of sodium acetate trihydrate and the local triggering to realize the overall energy release, thus realizing the stable storage and efficient energy release of industrial waste heat and solar waste heat, and reducing the operating cost;

[0020] 2. Without the need for additional heat sources, the extra waste heat generated by industrial output can be stored, and heating can be provided to buildings with heat demand at regular intervals and in fixed quantities;

[0021] 3. Through the characteristics of waste heat recovery and reuse, the building's additional demand for heating is reduced, the impact of additional heating on the natural environment is reduced, and efficient storage and reuse of energy is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the energy storage tank in the present invention.

[0024] In the figure: energy storage tank 1, phase change energy storage unit 2, phase change power trigger carrier 3, electromagnet power drive module 4, carrier recovery device 5, support frame 51, forward and reverse motor 52, winding roller 53, first energy storage circulating water pump 6, automatic control device 7, second energy storage circulating water pump 8, valve group 9. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0026] Example 1: Reference Figure 1 , 2 , which is the first embodiment of the present invention, and provides a phase change energy storage and release device based on local excitation, including an energy storage tank 1 and an automatic control device 7. A plurality of phase change energy storage units 2 are connected in the energy storage tank 1 through brackets arranged in parallel. A phase change power trigger carrier 3 is arranged directly above the phase change energy storage unit 2. The phase change power trigger carrier 3 is connected to an electromagnet power drive module 4. The electromagnet power drive module 4 is fixedly connected to the top of the energy storage tank 1. A carrier recovery device 5 is arranged on one side of the top of the energy storage tank 1. The carrier recovery device 5 is connected to the phase change power trigger carrier 3 through a connecting rope;

[0027] The top of one side of the energy storage tank 1 is connected to a first energy storage circulating water pump 6 through a connecting pipe, and the bottom of one side of the energy storage tank 1 is connected to a second energy storage circulating water pump 8 through a connecting pipe. A valve group 9 is installed on the connecting pipe connecting the first energy storage circulating water pump 6 and the second energy storage circulating water pump 8. The valve group 9 is composed of a plurality of valves numbered V1-V8. The automatic control device 7 is composed of a plurality of control units, and the control units control different equipment.

[0028] Through the control units of the automatic control device 7, the opening conditions of each device and valve are set to achieve the conversion of different working conditions. Working condition 1: using the waste heat phase change energy storage working condition, the automatic control device 7 gives a signal, the first energy storage circulating water pump 6, the valve group 9 numbered V1, V2, V3, V4 valves are opened, after the valve V4, through the pipeline to achieve the purpose of storing energy in the phase change energy storage unit 2 of the energy storage tank 1; after the heat storage process is completed, the automatic control device 7 gives a signal, the first energy storage circulating water pump 6, the valve group 9 numbered V 1. The valves of V2, V3 and V4 are closed, and the valves of the second energy storage circulating water pump 8 and the valve group 9 numbered V5, V6, V7 and V8 are opened to realize the purpose of returning the low-temperature water after heat exchange cooling to the waste heat pipeline; Working condition 2: Using the local triggering phase change energy release unit, the automatic control device 7 gives a signal, the signal reaches the electromagnet power drive module 4, the current is disconnected, the magnetic field is reset, and the phase change power trigger carrier 3 falls freely from the specified height to hit the phase change energy storage unit 2, triggering the phase change energy release of the supersaturated solution in the unit. After the triggering is completed, the automatic The signal given by the control device 7 reaches the carrier recovery device 5, the current is turned on, the forward and reverse motors 51 work, and the winding roller 53 is driven to reel in the connecting rope, thereby recovering the phase change power trigger carrier 3. After the process is completed, the automatic control device 7 gives a signal, and the signal reaches the electromagnet power drive module 4. The current in the coil is reset to generate a magnetic field, which adsorbs the phase change power trigger carrier 3, achieving the purpose of fully automatic phase change triggering and recovery during the system energy release process; Working condition three: After the phase change energy storage unit 2 releases energy, the automatic control device 7 gives a signal The signal is given by the automatic control device 7, the valves of the first energy storage circulating water pump 6 and the valve group 9 numbered V1, V2, V3, and V4 are opened, and after the valve V4, they are connected through the pipeline to achieve the purpose of releasing energy from the phase change energy storage unit 2 inside the energy storage tank 1; after the energy release process is completed, the automatic control device 7 gives a signal, the valves of the first energy storage circulating water pump 6 and the valve group 9 numbered V1, V2, V3, and V4 are closed, and the valves of the second energy storage circulating water pump 8 and the valve group 9 numbered V5, V6, V7, and V8 are opened, so as to achieve the purpose of supplying the heated high-temperature water to the heat-demanding side.

[0029] The present invention also discloses a method of a phase change energy storage and release device based on local excitation, which is characterized by comprising the following steps:

[0030] Step 1: Sodium acetate trihydrate is used as the phase change material of the phase change thermal storage system. The ratio of sodium acetate trihydrate phase change material to brine is determined by a drying method. After the fixed ratio solid powder determined by the drying method is mixed with water, liquid sodium acetate trihydrate is charged into the phase change energy storage unit 2 using a funnel, and the phase change energy storage unit 2 is sealed with a flange cover. After the packaging is completed, the phase change energy storage unit 2 is naturally cooled at an ambient temperature of 20°C to put the phase change energy storage unit 2 in a supercooled energy storage state;

[0031] Step 2: Sodium acetate trihydrate is filled inside the phase change energy storage unit 2 as a heat storage material and sealed with a flange cover with a rubber ring. In the energy storage stage, one side of the energy storage tank 1 is a high-temperature water inlet and the other side is a low-temperature water outlet. The first energy storage circulating water pump 6 and the second energy storage circulating water pump 8 are connected in parallel as the energy storage water circulation transportation power, which are backed up for each other; in the energy release stage, one side of the energy storage tank 1 is a low-temperature water inlet and the other side is a high-temperature water outlet. The first energy storage circulating water pump 6 and the second energy storage circulating water pump 8 are connected in parallel as the energy release water circulation transportation power, which are backed up for each other. The connection between each device and the pipeline is a flange connection;

[0032] Step 3: The energy storage process of the phase change energy storage system is to generate 83℃ heat source water through solar collectors or industrial waste heat, and pump it into the energy storage tank 1. Due to the heat loss along the pipeline, the water temperature drops to 82℃-75℃. After heat exchange with the phase change energy storage unit 2 filled with sodium acetate trihydrate material in the energy storage tank 1, it flows back to the constant temperature water tank solar collector or industrial pipeline from the bottom outlet of the energy storage tank 1 for low temperature use and repeats the cycle.

[0033] Step 4: The energy release process of the phase change energy storage system is to trigger the phase change power to trigger the carrier 3 to fall freely from a specified height to generate a percussion vibration, trigger the solidification of the supercooled solution in the phase change energy storage unit 2, and adsorb the electromagnet of the electromagnet power drive module 4 on the top of the energy storage tank 1. The energy release process is signaled by the automatic control device 7. The signal reaches the electromagnet power drive module 4, the current is disconnected, the magnetic field is reset, and the phase change power trigger carrier 3 falls freely from a specified height to hit the phase change energy storage unit 2, triggering the phase change energy release of the supersaturated solution in the unit. After the triggering is completed, the signal given by the automatic control device 7 reaches the carrier recovery device 5, the current is turned on, and the phase change power trigger carrier 3 is recovered. After the process is completed, the automatic control device 7 gives a signal, the signal reaches the electromagnet power drive module 4, the current in the coil is reset to generate a magnetic field, and the phase change power trigger carrier 3 is adsorbed, so as to achieve the purpose of fully automatic phase change triggering and recovery in the system energy release process, and the energy is collected and analyzed by the energy storage tank 1 internal energy charging and release monitoring device.

[0034] Specifically, the drying method is used to determine the moisture content of the phase change material as follows: weigh different masses of sodium acetate crystals in a weighing bottle using an electronic balance, place the bottle in an open electric blast drying oven at 105°C for heating and evaporation, cover the weighing bottle with a cap after 5 hours, move it to an environment to cool for 30 minutes, and weigh it, and calculate the evaporated water after 5 hours. Then change the heating time to 2 hours, repeat the above steps until the difference between the two weighings does not exceed 5 mg, and evaporate to dryness to obtain a solid powder for later use.

[0035] Example 2: Reference Figure 1-2, which is the second embodiment of the present invention. This embodiment is based on the previous embodiment. Specifically, the material of the energy storage tank 1 is high-quality carbon steel and is coated with thermal insulation material on the outside. An internal monitoring device dedicated to the phase change energy storage and release device is fixedly installed in the energy storage tank 1 and is composed of a temperature sensor, a liquid level sensor, etc., so that corresponding signals can be collected in real time to achieve real-time monitoring and control of charging and releasing energy.

[0036] Specifically, the material of the phase change energy storage unit 2 is high-quality stainless steel and the inside is polished to form a smooth inner wall surface. The phase change energy storage unit 2 is arranged in a multi-layer spaced stacking manner. The phase change energy storage unit 2 is filled with a supersaturated sodium acetate trihydrate solution. The phase change energy storage unit 2 is connected to the energy storage tank 1 by a stainless steel pipe.

[0037] Specifically, the first energy storage circulating water pump 6 and the second energy storage circulating water pump 8 are respectively composed of two water pumps connected in parallel. The first energy storage circulating water pump 6 and the second energy storage circulating water pump 8 respectively include a charging circulating water pump and an energy releasing circulating water pump. Different circulating water pumps are controlled by the automatic control device 7 under different working conditions to achieve water flow under different working conditions.

[0038] Specifically, the phase change power trigger carrier 3 is composed of a solid stainless steel ball, which can be adsorbed by the electromagnetic sticker of the electromagnet power drive module 4, ensuring the free fall and recovery of the phase change power trigger carrier 3, and realizing the phase change energy release of the internal material of the phase change energy storage unit 2.

[0039] Specifically, the carrier recovery device 5 includes a support frame 51, which is fixedly connected to one side of the top of the energy storage tank 1. A forward and reverse motor 52 is fixedly connected to one side of the support frame 51. The output shaft of the forward and reverse motor 52 is fixedly connected to a winding roller 53. The winding roller 53 is rotatably connected between the support frames 51. A connecting rope is wound around the winding roller 53, and the connecting rope slides into the energy storage tank 1 and then fixedly connected to the phase change power trigger carrier 3. The setting of the carrier recovery device 5 facilitates the recovery of the phase change power trigger carrier 3 after it falls, so as to achieve the purpose of fully automatic phase change triggering and recovery during the energy release process of the system.

[0040] Example 3: Reference Figure 1-2, which is the third embodiment of the present invention. This embodiment is based on the above two embodiments. When in use, the opening conditions of each device and valve are set through each control unit of the automatic control device 7 to achieve the conversion of different working conditions. Working condition 1: using waste heat phase change energy storage working condition, the automatic control device 7 gives a signal, the first energy storage circulating water pump 6 and the valves of the valve group 9 numbered V1, V2, V3, and V4 are opened, and after the valve V4, they are connected through the pipeline to achieve the purpose of storing energy in the phase change energy storage unit 2 in the energy storage tank 1; after the heat storage process is completed, the automatic control device 7 gives A given signal is given, the valves of the first energy storage circulating water pump 6 and the valve group 9 numbered V1, V2, V3, and V4 are closed, and the valves of the second energy storage circulating water pump 8 and the valve group 9 numbered V5, V6, V7, and V8 are opened, so as to return the low-temperature water after heat exchange cooling to the waste heat pipeline; Working condition 2: using the local triggering phase change energy release unit, the automatic control device 7 gives a given signal, the signal reaches the electromagnet power drive module 4, the current is disconnected, the magnetic field is reset, and the phase change power trigger carrier 3 falls freely from a specified height to hit the phase change energy storage unit 2, triggering the supersaturated solution in the unit After the phase change energy release is triggered, the signal given by the automatic control device 7 reaches the carrier recovery device 5, the current is turned on, the forward and reverse motors 51 work, and the winding roller 53 is driven to rewind the connecting rope, and then the phase change power trigger carrier 3 is recovered. After the process is completed, the automatic control device 7 gives a signal, and the signal reaches the electromagnet power drive module 4. The current in the coil is reset to generate a magnetic field, which adsorbs the phase change power trigger carrier 3, achieving the purpose of fully automatic phase change triggering and recovery during the system energy release process; Working condition three: After the trigger, the phase change energy storage unit 2 releases energy, automatically The control device 7 gives a signal, the first energy storage circulating water pump 6 and the valves of the valve group 9 numbered V1, V2, V3, and V4 are opened, and after the valve V4, they are connected through the pipeline to achieve the purpose of releasing energy from the phase change energy storage unit 2 inside the energy storage tank 1; after the energy release process is completed, the automatic control device 7 gives a signal, the first energy storage circulating water pump 6 and the valves of the valve group 9 numbered V1, V2, V3, and V4 are closed, and the second energy storage circulating water pump 8 and the valves of the valve group 9 numbered V5, V6, V7, and V8 are opened, so as to achieve the purpose of supplying the heated high-temperature water to the heat-demanding side.

[0041] The specific method steps are as follows: Step 1: Sodium acetate trihydrate is used as the phase change material of the phase change thermal storage system, and the ratio of sodium acetate trihydrate phase change material to brine is determined by the drying method. The process of determining the water content of the phase change material by the drying method is as follows: Use an electronic balance to weigh different masses of sodium acetate trihydrate crystals in a weighing bottle, place it in an open electric blast drying oven at 105°C for heating and evaporation, cover the weighing bottle cap after 5 hours, move it to the environment to cool for 30 minutes and weigh it, and calculate the evaporated water after 5 hours; then change the heating time to 2 hours, repeat the above steps until the difference between the two weighings does not exceed 5 mg, and evaporate the solid powder for use. After mixing the fixed ratio solid powder with water, use a funnel to fill the liquid sodium acetate trihydrate into the phase change energy storage unit 2, seal it with a flange cover, and cool it naturally at an ambient temperature of 20°C after the packaging is completed, so that the phase change energy storage unit 2 is in a supercooled energy storage state;

[0042] Step 2: The phase-change energy storage unit 2 is a stainless steel circular heat storage unit, which is filled with sodium acetate trihydrate as a heat storage material. The phase-change energy storage unit 2 is made of stainless steel plate. To facilitate material filling, two circular holes are opened at a distance of 5 cm from the long and wide sides. The diameter of the circular hole matches the size of the phase-change energy storage unit 2 and is sealed with a flange cover with a rubber ring. At the same time, the inner surface is smooth. The overall structure is a cylindrical structure, and the phase-change energy storage unit 2 is stacked by a fixed bracket; in the energy storage stage, one side of the energy storage tank 1 is a high-temperature water inlet and the other side is a low-temperature water outlet. The first energy storage circulating water pump 6 and the second energy storage circulating water pump 8 are connected in parallel as the energy storage water circulation transportation power, which are backed up for each other; in the energy release stage, one side of the energy storage tank 1 is a low-temperature water inlet and the other side is a high-temperature water outlet. The first energy storage circulating water pump 6 and the second energy storage circulating water pump 8 are connected in parallel as the energy release water circulation transportation power, which are backed up for each other. The connection between each device and the pipeline is a flange connection, which is convenient for disassembly;

[0043] Step 3: The energy storage process of the phase change energy storage system is to generate 83°C heat source water through solar collectors or industrial waste heat, and pump it into the energy storage tank 1. Due to the heat loss along the pipeline, the water temperature drops to 80°C, and after heat exchange with the phase change energy storage unit 2 filled with sodium acetate trihydrate material in the energy storage tank 1, it flows back to the constant temperature water tank solar collector or industrial pipeline from the bottom outlet of the energy storage tank 1 for low temperature use and repeats the cycle;

[0044] Step 4: The energy release process of the phase change energy storage system is to trigger the solidification of the supercooled solution in the phase change energy storage unit 2 by the phase change power trigger carrier 3 that freely falls from a specified height. The phase change power trigger carrier 3 is composed of a solid stainless steel ball and an iron chain, and is adsorbed on the top of the energy storage tank 1 through the electromagnet of the electromagnet power drive module 4. The energy release process is given a signal by the automatic control device 7. The signal reaches the electromagnet power drive module 4, the current is disconnected, the magnetic field is reset, and the iron ball freely falls from a specified height to hit the phase change energy storage unit 2, triggering the phase change energy release of the supersaturated solution in the unit; after the trigger is completed, the signal is given by the automatic control device 7. When it reaches the carrier recovery device 5, the current is turned on, and the forward and reverse motors of the carrier recovery device 5 work, driving the winding roller 53 to reel in the connecting rope, thereby recovering the phase change power trigger carrier 3. After the process is completed, the automatic control device 7 gives a signal, and the signal reaches the electromagnet power drive module 4. The current in the coil is reset to generate a magnetic field, which adsorbs the phase change power trigger carrier 3, thereby achieving the purpose of fully automatic phase change triggering and recovery during the energy release process of the system; the energy is collected and analyzed through the internal energy charging and release monitoring device of the system. The monitoring device is composed of a temperature sensor, a liquid level sensor, etc., which can collect corresponding signals in real time to realize real-time monitoring and energy charging and release control.

[0045] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A phase change energy storage and release method based on local excitation, characterized in that: The invention comprises an energy storage tank (1), characterized in that: a plurality of phase change energy storage units (2) are connected in the energy storage tank (1) via brackets arranged in parallel; a phase change power trigger carrier (3) is arranged directly above the phase change energy storage unit (2); the phase change power trigger carrier (3) is connected to an electromagnet power drive module (4); the electromagnet power drive module (4) is fixedly connected to the top of the energy storage tank (1); a carrier recovery device (5) is arranged on one side of the top of the energy storage tank (1); the carrier recovery device (5) is connected to the phase change power trigger carrier (3) via a connecting rope; The top of one side of the energy storage tank (1) is connected to a first energy storage circulating water pump (6) via a connecting pipe, and the bottom of one side of the energy storage tank (1) is connected to a second energy storage circulating water pump (8) via a connecting pipe, and a valve group (9) is installed on the connecting pipe connecting the first energy storage circulating water pump (6) and the second energy storage circulating water pump (8); The valve group (9) is composed of a plurality of valves numbered V1-V8; The energy storage tank (1) is made of high-quality carbon steel and is coated with heat-insulating material on the outside. An internal monitoring device dedicated to the phase-change energy storage and release device is fixedly installed in the energy storage tank (1) and is composed of a temperature sensor and a liquid level sensor. The phase-change energy storage unit (2) is made of high-quality stainless steel and is internally polished to form a smooth inner wall surface. The phase-change energy storage unit (2) is arranged in a multi-layered stacked manner. The phase-change energy storage unit (2) is filled with a supersaturated sodium acetate trihydrate solution. The phase-change energy storage unit (2) is connected to the energy storage tank (1) by a stainless steel pipe. The first energy storage circulating water pump (6) and the second energy storage circulating water pump (8) are respectively composed of two water pumps connected in parallel, and the first energy storage circulating water pump (6) and the second energy storage circulating water pump (8) respectively include an energy charging circulating water pump and an energy releasing circulating water pump; The automatic control device (7) is composed of a plurality of control units, and the phase change power trigger carrier (3) is composed of a solid stainless steel ball; The carrier recovery device (5) comprises a support frame (51), the support frame (51) is fixedly connected to one side of the top of the energy storage tank (1), one side of the support frame (51) is fixedly connected to a forward and reverse motor (52), the output shaft of the forward and reverse motor (52) is fixedly connected to a winding roller (53), the winding roller (53) is rotatably connected between the support frames (51), a connecting rope is wound around the winding roller (53), and the connecting rope slides into the energy storage tank (1) and is fixedly connected to the phase change power trigger carrier (3); The method of the energy release device comprises the following steps: Step 1: Sodium acetate trihydrate is used as the phase change material of the phase change thermal storage system, and the ratio of sodium acetate trihydrate phase change material to brine is determined by a drying method. After the fixed ratio solid powder determined by the drying method is mixed with water, liquid sodium acetate trihydrate is charged into the phase change energy storage unit (2) using a funnel, and the phase change energy storage unit (2) is sealed with a flange cover. After the packaging is completed, the phase change energy storage unit (2) is naturally cooled at an ambient temperature of 20° C., so that the phase change energy storage unit (2) is in a supercooled energy storage state; Step 2: Sodium acetate trihydrate is filled inside the phase change energy storage unit (2) as a heat storage material and sealed with a flange cover with a rubber ring. In the energy storage stage, one side of the energy storage tank (1) is a high-temperature water inlet and the other side is a low-temperature water outlet. The first energy storage circulating water pump (6) and the second energy storage circulating water pump (8) are connected in parallel as a power for circulating and transporting energy storage water, and serve as backup for each other. In the energy release stage, one side of the energy storage tank (1) is a low-temperature water inlet and the other side is a high-temperature water outlet. The first energy storage circulating water pump (6) and the second energy storage circulating water pump (8) are connected in parallel as a power for circulating and transporting energy release water, and serve as backup for each other. The connection between each device and the pipeline is a flange connection; Step 3: The energy storage process of the phase change energy storage system is to generate 83°C heat source water through solar collectors or industrial waste heat, pump it into the energy storage tank (1), and the water temperature drops to 82°C-75°C due to heat loss along the pipeline. After heat exchange with the phase change energy storage unit (2) filled with sodium acetate trihydrate material in the energy storage tank (1), it flows back to the constant temperature water tank solar collector or industrial pipeline from the bottom outlet of the energy storage tank (1) for low temperature use, and repeats the cycle. Step 4: The energy release process of the phase change energy storage system is to trigger the phase change power trigger carrier (3) to freely fall from a specified height to generate a knocking vibration, triggering the solidification of the supercooled solution in the phase change energy storage unit (2), and adsorbing the electromagnet of the electromagnet power drive module (4) on the top of the energy storage tank (1). The energy release process is given a signal by the automatic control device (7). The signal reaches the electromagnet power drive module (4), the current is disconnected, the magnetic field is reset, and the phase change power trigger carrier (3) freely falls from a specified height to hit the phase change energy storage unit (2), triggering the supersaturated solution in the unit. After the trigger is completed, a signal is given by the automatic control device (7) and reaches the carrier recovery device (5), and the current is turned on to recover the phase change power trigger carrier (3). After the process is completed, a signal is given by the automatic control device (7) and reaches the electromagnet power drive module (4), and the current in the coil is reset to generate a magnetic field, which adsorbs the phase change power trigger carrier (3), thereby achieving the purpose of fully automatic phase change triggering and recovery during the system energy release process, and energy data is collected and analyzed through the energy storage tank (1) internal energy charging and release monitoring device.

2. A phase change energy storage and release method based on local excitation according to claim 1, characterized in that: The drying method for determining the moisture content of phase change materials is as follows: using an electronic balance to weigh different masses of sodium acetate crystals in a weighing bottle, the bottle is placed open in an electric blast drying oven at 105°C for heating and evaporation, the weighing bottle is covered with a cap after 5 hours, the bottle is moved to an environment for cooling for 30 minutes, and then weighed, the evaporated water after 5 hours is calculated, and then the heating time is changed to 2 hours, and the above steps are repeated until the difference between the two weighings does not exceed 5 mg, and the solid powder is evaporated for use.

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