Electric heating collaborative cross-seasonal gradient phase change energy supply system and operation method thereof

Abstract

The invention belongs to the technical field of phase change energy supply, and discloses an electric heating collaborative cross-seasonal gradient phase change energy supply system and an operation method thereof. In the electric heating collaborative cross-seasonal gradient phase change energy supply system, each heat energy storage tank is filled with a phase change material, and a heat exchange pipeline is arranged in the phase change material; the phase change material of each heat energy storage tank is provided with an independent start-stop device; the heat energy storage tanks are communicated in series step by step through heat exchange pipelines. The controller is used for controlling the electric heating device and the start-stop devices corresponding to the phase change materials filled in the heat energy storage tanks on the basis of preset control logic according to temperature data transmitted by the temperature sensors. According to the technical scheme, the technical problems that an existing energy supply system has instantaneity in energy discharge and cannot continuously and stably discharge energy are solved, time-space conversion of energy is achieved, peak load shifting of a power grid is facilitated, and new energy consumption is promoted.

Description

Technical Field

[0001] The present invention belongs to the technical field of phase change energy supply, and in particular relates to an electric-thermal coordinated cross-season gradient phase change energy supply system and an operation method thereof. Background Art

[0002] At present, the power grid system regulation mainly adopts the mode of "source follows load". When the power load suddenly increases, once the power generation capacity on the power supply side is insufficient, it will cause an imbalance between supply and demand, which will seriously affect the safe operation of the power grid. The development of new energy utilization technologies such as wind and light is trying to gradually solve the above problems.

[0003] By the end of 2023, photovoltaic and wind power installed capacity will account for about 34% of the country's cumulative power installed capacity, but power generation will account for only 15%; the reason for the large gap between power generation share and installed capacity share is mainly that power stations are restricted by grid channel restrictions and the uncertainty brought about by wind and solar photovoltaic volatility. The above two factors make it impossible for power stations to absorb all the electricity generated by wind power generation and solar photovoltaic power generation, which greatly increases the wind and solar power abandonment rate. For example, the actual wind and solar power abandonment rate in Xinjiang has reached 30% to 40%; at the same time, many high-energy-consuming enterprises are eager for low-priced green electricity but have to give up due to the above restrictions. The phenomenon of "wind and solar power abandonment" and "power shortage" has appeared in many places, and the gap between electricity consumption peaks and valleys has gradually widened. The power grid is still under great pressure during peak electricity consumption.

[0004] Phase change materials can use their latent heat properties to store and release energy, but the energy release of phase change materials is instantaneous and cannot achieve continuous and stable energy release. The existing technology of using phase change materials to store energy to alleviate power consumption pressure is still immature, and new technical solutions are urgently needed. Summary of the invention

[0005] The purpose of the present invention is to provide an electric-thermal coordinated cross-season gradient phase change energy supply system and its operation method to solve one or more of the above-mentioned technical problems. In the technical solution disclosed in the present invention, the technical means of gradient starting the thermal energy storage tank is adopted to solve the technical problem that the energy release of the existing energy supply system is instantaneous and cannot be released continuously and stably; at the same time, based on the technical idea of ​​valley power storage and peak power release, the space-time conversion of energy is realized, which is helpful for the power grid to reduce peak and fill valley and promote the consumption of new energy.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides an electric-heat synergistic cross-season gradient phase change energy supply system, comprising: a thermal energy storage tank, a controller, a temperature sensor and an electric heating device; wherein: There are multiple thermal energy storage tanks; each thermal energy storage tank is filled with a phase change material for storing and releasing energy, and a heat exchange pipe is arranged in the phase change material; the phase change material of each thermal energy storage tank is provided with an independent start-stop device, and the start-stop device is used to control the phase change material to be in a working or non-working state; The plurality of thermal energy storage tanks are connected in series step by step through the heat exchange pipes in each thermal energy storage tank; wherein the inlet of the heat exchange pipe of the first-stage thermal energy storage tank is used to pass the working medium to be heat exchanged, the outlet of the heat exchange pipe of the last-stage thermal energy storage tank is used to pass the working medium after the final heat exchange, and the inlet and outlet of the heat exchange channel of each thermal energy storage tank at the intermediate stage are respectively connected to the outlet of the heat exchange channel of the previous-stage thermal energy storage tank and the inlet of the heat exchange channel of the next-stage thermal energy storage tank; The temperature sensor is used to monitor and collect the temperature of the phase change material in each thermal energy storage tank and output it to the controller; The controller is used to control the electric heating device and the start-stop device corresponding to the phase change material filled in each thermal energy storage tank based on the preset control logic according to the temperature data transmitted by the temperature sensor; wherein, when the electric heating device is controlled based on the preset control logic, the phase change material in the thermal energy storage tank is heated by valley electricity; when the start-stop device corresponding to the phase change material filled in each thermal energy storage tank is controlled based on the preset control logic, the phase change material of each thermal energy storage tank is started step by step in a gradient along the flow direction of the working medium.

[0007] A further improvement of the present invention is that The phase change material filled in the thermal energy storage tank is a time-space phase change material.

[0008] A further improvement of the present invention is that The exciting end of the start-stop device is an exciting iron wire; Among them, the start-stop device controls the exciting iron wire to be inserted into the space-time phase change material, and the space-time phase change material is in a working state; the start-stop device controls the exciting iron wire to be pulled out from the space-time phase change material, and the space-time phase change material is in a non-working state.

[0009] A further improvement of the present invention is that The step of controlling the start-stop device corresponding to the electric heating device and the phase change material filled in each thermal energy storage tank based on the preset control logic includes: From the first-stage thermal energy storage tank to the last-stage thermal energy storage tank, the phase change material is stimulated to release heat step by step; wherein, the start-stop device corresponding to the phase change material of the first-stage thermal energy storage tank is turned on according to the external heat exchange demand, and the start-stop devices corresponding to the phase change materials of the subsequent thermal energy storage tanks are turned on when the temperature of the phase change material of the previous-stage thermal energy storage tank is less than the first preset temperature threshold; When the temperature data of the phase change material of the last stage thermal energy storage tank is less than the first preset temperature threshold, the controller turns off all start-stop devices and controls the electric heating device to heat the phase change materials in all thermal energy storage tanks simultaneously using valley electricity.

[0010] A further improvement of the present invention is that it further comprises: a working fluid input main pipeline and a working fluid output main pipeline; wherein, The working fluid input main pipeline is used to communicate with the inlet of the heat exchange pipeline of the first-stage thermal energy storage tank, and the working fluid output main pipeline is used to communicate with the outlet of the heat exchange pipeline of the last-stage thermal energy storage tank; A heat exchanger is provided on the working medium output main pipeline, and the heat exchanger is used to supply heat to the demand side.

[0011] A further improvement of the present invention is that it also includes: a valve and a pump; wherein, The valve and the pump are used to be arranged in the working fluid input main pipeline or the working fluid output main pipeline.

[0012] A further improvement of the present invention is that The valve is a solenoid valve or a pneumatic valve.

[0013] A further improvement of the present invention is that it also includes: a flow meter; wherein, The flow meter is used to be arranged in the working medium input main pipeline.

[0014] A further improvement of the present invention is that it also includes: a working medium storage device; The outlet of the working fluid storage device is connected to the inlet of the working fluid input main pipeline, and the inlet of the working fluid storage device is connected to the outlet of the working fluid output main pipeline.

[0015] In a second aspect, the present invention provides an operation method of an electric-thermal coordinated cross-season gradient phase change energy supply system, comprising the following steps: The working medium to be heat exchanged is introduced into the inlet of the heat exchange pipe of the first-stage heat storage tank, and the working medium after the final heat exchange is introduced into the outlet of the heat exchange pipe of the last-stage heat storage tank; wherein the temperature sensor monitors and collects the temperature of the phase change material in each heat storage tank and outputs it to the controller, and the controller controls the start-stop device corresponding to the phase change material filled in each heat storage tank based on the temperature data transmitted by the temperature sensor and the preset control logic; Among them, when the electric heating device is controlled based on the preset control logic, the valley electricity is used to heat the phase change material in the thermal energy storage tank to ensure that the thermal energy storage tank is in an energy storage state; when the start-stop device corresponding to the phase change material filled in each thermal energy storage tank is controlled based on the preset control logic, the phase change material of each thermal energy storage tank is started step by step in a gradient along the flow direction of the working fluid to achieve continuous heat release.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention specifically discloses an electric-thermal coordinated cross-seasonal gradient phase-change energy supply system, which is provided with a plurality of heat storage tanks connected in series through heat exchange pipes, and the phase change material of each heat storage tank is provided with an independent start-stop device. The start-stop device can be controlled by a controller to start and stimulate the working state of the phase change material of each heat storage tank in a gradient manner. This technical means solves the technical problems of instantaneous energy release and inability to release energy continuously and stably in the existing energy supply system, and realizes cascade energy supply. At the same time, the present invention is provided with a controller, a temperature sensor and an electric heating device, and can realize the space-time conversion of energy through valley electricity storage and peak electricity release, which is helpful for peak shaving and valley filling of the power grid and promoting the consumption of new energy. In summary, the technical solution of the present invention achieves the purpose of uniform, slow and continuous heat release by storing energy through the latent heat characteristics of phase change materials and the gradient starting of phase change materials of multiple thermal energy storage tanks; in addition, the present invention is provided with an electric heating device, which can convert electrical energy into thermal energy and store energy in the thermal energy storage tank by utilizing the latent heat characteristics of phase change materials, which can realize cross-seasonal storage and achieve the time-space conversion of energy, and all use valley electricity for conversion, which has a good improvement effect on the "wind and solar abandonment" phenomenon and promotes the consumption of new energy.

[0017] In the present invention, during valley power, the electric heating device can charge multiple thermal energy storage tanks at the same time; during peak power, the controller controls the start-stop device to start in gradients, and the thermal energy storage tank releases heat and heats the working fluid flowing out of the working fluid storage device. The heated working fluid then passes through the heat exchanger on the working fluid output main pipeline to complete the heat exchange between the system working fluid and the working fluid on the demand side. The exchanged system working fluid is stored in the working fluid storage device, waiting for the next cycle, and the working fluid on the demand side flows back to the demand side to provide thermal energy. In summary, the technical solution of the present invention can utilize valley power to store energy, and release thermal energy in gradients according to the demand side demand during peak power, thereby achieving the purpose of peak shaving and valley filling, and can share the pressure of power supply for power plants during peak power. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below; obviously, the drawings described below are some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 is a schematic diagram of an electric-thermal synergistic cross-season gradient phase change energy supply system in an embodiment of the present invention; Figure 2 is a schematic diagram of the internal structure of a thermal energy storage tank in an embodiment of the present invention; Figure 3This is a schematic diagram of an application of an electric-thermal synergistic cross-season gradient phase change energy supply system in a specific embodiment of the present invention; The explanations of the reference numerals in the figures are as follows: 1. Thermal energy storage tank; 2. Start-stop device; 3. Controller; 4. Temperature sensor; 5. Electric heating device; 6. Valve; 7. Flow meter; 8. Pump; 9. Water tank; 10. Heat exchanger; 11. Phase change material; 12. Excitation wire. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments and technical solutions are only part of the embodiments of the present invention, not all of the embodiments.

[0021] All other embodiments obtained by those of ordinary skill in the art without creative work based on the technical solutions disclosed in the embodiments of the present invention belong to the scope of protection of the present invention. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device including a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0022] See also Figure 1 and Figure 2 The embodiment of the present invention provides an electric-heat synergistic cross-season gradient phase change energy supply system, comprising: a thermal energy storage tank 1, a start-stop device 2, a controller 3, a temperature sensor 4 and an electric heating device 5; wherein, There are multiple thermal energy storage tanks 1, each of which is filled with a phase change material 11 for storing and releasing energy, and a heat exchange pipe is embedded in the phase change material 11. The phase change material 11 of each thermal energy storage tank 1 is provided with an independent start-stop device 2; multiple thermal energy storage tanks 1 are connected in series step by step through the heat exchange pipes in each thermal energy storage tank 1, and the inlet of the heat exchange pipe of the first-stage thermal energy storage tank is used to pass the working medium to be heat exchanged, and the outlet of the heat exchange pipe of the last-stage thermal energy storage tank is used to pass the working medium after the final heat exchange; further explanatory, the inlet and outlet of the heat exchange channel of the thermal energy storage tank at the middle stage are respectively connected with the outlet of the heat exchange channel of the previous stage thermal energy storage tank and the inlet of the heat exchange channel of the next stage thermal energy storage tank; in a further exemplary technical solution, such as Figure 2 As shown, the phase change material 11 is provided with an exciting iron wire 12, and the phase change material 11 is controlled to be in a working state or a non-working state by the exciting iron wire 12. The phase change material 11 is specifically a time-space phase change material.

[0023] The temperature sensor 4 is used to monitor and collect the temperature of the phase change material 11 in each thermal energy storage tank 1 and output it to the controller 3 in the form of an electrical signal; The controller 3 is used to control the electric heating device 5 and the start-stop device 2 corresponding to the phase change material 11 filled in each thermal energy storage tank 1 based on the preset control logic according to the temperature data transmitted by the temperature sensor 4; wherein, when the electric heating device 5 is controlled based on the preset control logic, the phase change material 11 in the thermal energy storage tank 1 is heated by valley electricity to ensure that the thermal energy storage tank 1 is in an energy storage state; when the start-stop device 2 corresponding to the phase change material 11 filled in each thermal energy storage tank 1 is controlled based on the preset control logic, the phase change material 11 of each thermal energy storage tank 1 is started step by step in a gradient along the working medium flow direction, so as to achieve continuous heat release through the phase change material 11 in each thermal energy storage tank 1.

[0024] In the electric-heat coordinated cross-season gradient phase-change energy supply system provided by the embodiment of the present invention, a plurality of heat storage tanks are connected in series through heat exchange pipes, and the phase change materials filled in each heat storage tank are provided with independent start-stop devices. The technical means of starting the phase change materials in each heat storage tank step by step by gradient solves the technical problem that the energy release in the existing energy supply system is instantaneous and cannot be continuously and stably released; at the same time, the embodiment of the present invention is provided with a controller, a temperature sensor and an electric heating device, based on the technical characteristics of valley electricity energy storage and peak electricity period energy release, the time-space conversion of energy is realized, which is helpful for the power grid to cut the peak and fill the valley, and promote the consumption of new energy. Further specifically explanatory, the embodiment of the present invention stores energy through the latent heat characteristics of the phase change material, and starts the phase change material in the heat storage tank in a gradient by using the characteristics of independent parallel connection, so as to achieve the purpose of uniform, slow and continuous heat release; in addition, the present invention is provided with an electric heating device, which can use valley electricity to realize the energy storage of the heat storage tank, and release energy in the peak electricity period, so as to realize the time-space conversion of energy, which is helpful for the power grid to cut the peak and fill the valley and promote the consumption of new energy.

[0025] In a specific embodiment of the present invention, in the controller 3, according to the temperature data transmitted by the temperature sensor 4, based on the preset control logic, the electric heating device 5 and the start-stop device 2 corresponding to the phase change material 11 filled in each thermal energy storage tank 1 are controlled. When the temperature data of the phase change material of the last-stage thermal energy storage tank is less than the first preset temperature threshold, the controller 3 turns off all the start-stop devices 2, and controls the electric heating device 5 to use valley electricity to heat the phase change materials 11 in all the thermal energy storage tanks 1 to ensure the energy storage state of the thermal energy storage tanks 1.

[0026] In a specific embodiment of the present invention, in the controller 3, according to the temperature data transmitted by the temperature sensor 4, based on the preset control logic, the electric heating device 5 and the start-stop device 2 corresponding to the phase change material 11 filled in each thermal energy storage tank 1 are controlled. The time-space phase change material in the heat storage tank 1 is at room temperature when not activated, and will release heat only after being excited by the exciting iron wire 12; The temperature sensor 4 detects the temperature of the phase change material 11 in the thermal energy storage tank 1. When the temperature of the phase change material of the first-stage thermal energy storage tank is greater than or equal to the first preset temperature threshold, it releases heat normally. When the temperature of the phase change material of the first-stage thermal energy storage tank is less than the first preset temperature threshold, the controller controls the start-stop device corresponding to the phase change material of the second-stage thermal energy storage tank to stimulate the phase change material of the second-stage thermal energy storage tank to release heat. This process is repeated step by step until the phase change material of the last-stage thermal energy storage tank is stimulated to release heat.

[0027] In the technical solution provided by the embodiment of the present invention, the controller obtains the temperature of the phase change material in the thermal energy storage tank collected by the temperature sensor to control the opening and closing of the electric heating device and the start-stop device corresponding to each phase change material. Based on the temperature sensor, the controller and the independently arranged start-stop device, the gradient step energy supply is realized through the step-by-step start of the phase change material. The step energy supply method has significant economy and energy supply efficiency.

[0028] See also Figure 3 In a specific application embodiment of the present invention, it also includes: a working fluid input main pipeline and a working fluid output main pipeline; wherein, The working fluid input main pipeline is used to be connected to the inlet of the heat exchange pipeline of the first-stage thermal energy storage tank, and the working fluid output main pipeline is used to be connected to the outlet of the heat exchange pipeline of the last-stage thermal energy storage tank; a heat exchanger 10 is arranged on the working fluid output main pipeline, and the heat exchanger 10 is used to supply heat to the demand side; explanatoryly, the heat exchanger 10 is used to realize the working fluid heat energy exchange, and the working fluid of the system is exchanged with the working fluid of the demand side for heat energy, so as to achieve the purpose of transferring the system heat energy to the demand side.

[0029] See also Figure 3 In a further preferred technical solution of the embodiment of the present invention, a valve 6, a flow meter 7 and a pump 8 are provided on the working fluid input main pipeline, and a valve 6 and a pump 8 are provided on the working fluid output main pipeline; wherein the valve 6 is used to control the connection or disconnection of the working fluid input main pipeline or the working fluid output main pipeline; the flow meter 7 is used to monitor the size of the working fluid flow rate to achieve the purpose of controlling the working fluid flow rate; the pump 8 is used to pump the working fluid out of the working fluid storage device or into the working fluid storage device to achieve the purpose of recycling the working fluid; in the specific exemplary technical solution, the working fluid can be selected from water, and the working fluid storage device can be selected from a water tank 9.

[0030] In a specific exemplary technical solution, the valve 6 may be a solenoid valve or a pneumatic valve; when arranged on the construction site, the pump 8 should be arranged near the water tank 9 to achieve the purpose of water circulation.

[0031] In one embodiment of the present invention, the thermal energy storage tanks 1 can be increased or decreased as needed, and the number can be between 5 and 2000.

[0032] In summary, the embodiment of the present invention specifically discloses an electric-heat coordinated cross-season phase-change energy supply system with gradient and its operation method; wherein, in the electric-heat coordinated cross-season phase-change energy supply system with gradient, each heat storage tank is filled with phase change material, and a heat exchange pipe is arranged in the phase change material; the phase change material of each heat storage tank is provided with an independent start-stop device; multiple heat storage tanks are connected in series step by step through heat exchange pipes; the controller is used to control the electric heating device and the start-stop device corresponding to the phase change material filled in each heat storage tank based on the temperature data transmitted by the temperature sensor and the preset control logic. The technical solution disclosed in the embodiment of the present invention utilizes the latent heat characteristics of phase change materials for energy storage, which can transfer the power load during peak hours, realize the space-time conversion of energy, and help the power grid to shave peaks and fill valleys and promote the consumption of new energy; at the same time, the technical solution of the present invention adopts the technical means of starting the heat storage tank with gradient, which solves the technical problem that the energy release in the existing energy supply system is instantaneous and cannot be released continuously and stably.

[0033] 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 above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An electric-heat synergistic cross-season gradient phase change energy supply system, characterized in that: include: A thermal energy storage tank (1), a controller (3), a temperature sensor (4) and an electric heating device (5); wherein: There are a plurality of thermal energy storage tanks (1); each thermal energy storage tank (1) is filled with a phase change material (11) for storing and releasing energy, and a heat exchange pipe is arranged in the phase change material (11); the phase change material (11) of each thermal energy storage tank (1) is provided with an independent start-stop device (2), and the start-stop device (2) is used to control the phase change material (11) to be in a working state or a non-working state; The plurality of heat storage tanks (1) are connected in series step by step through heat exchange pipes in the heat storage tanks (1); wherein the inlet of the heat exchange pipe of the first-stage heat storage tank is used to introduce the working medium to be heat exchanged, the outlet of the heat exchange pipe of the last-stage heat storage tank is used to introduce the working medium after the final heat exchange, and the inlet and outlet of the heat exchange channel of each heat storage tank at the intermediate stage are respectively connected to the outlet of the heat exchange channel of the previous-stage heat storage tank and the inlet of the heat exchange channel of the next-stage heat storage tank; The temperature sensor (4) is used to monitor and collect the temperature of the phase change material (11) in each thermal energy storage tank (1) and output it to the controller (3); The controller (3) is used to control the electric heating device (5) and the start-stop device (2) corresponding to the phase change material (11) filled in each thermal energy storage tank (1) based on the preset control logic according to the temperature data transmitted by the temperature sensor (4); wherein when the electric heating device (5) is controlled based on the preset control logic, the phase change material (11) in the thermal energy storage tank (1) is heated by valley electricity; and when the start-stop device (2) corresponding to the phase change material (11) filled in each thermal energy storage tank (1) is controlled based on the preset control logic, the phase change material (11) of each thermal energy storage tank (1) is started step by step in a gradient along the flow direction of the working medium.

2. The electric-heat synergistic cross-season gradient phase change energy supply system according to claim 1 is characterized in that: The phase change material (11) filled in the thermal energy storage tank (1) is a time-space phase change material.

3. The electric-heat synergistic cross-season gradient phase change energy supply system according to claim 2 is characterized in that: The exciting end of the start-stop device (2) is an exciting iron wire (12); The start-stop device (2) controls the exciting iron wire (12) to be inserted into the space-time phase change material, and the space-time phase change material is in a working state; the start-stop device (2) controls the exciting iron wire (12) to be pulled out of the space-time phase change material, and the space-time phase change material is in a non-working state.

4. The electric-heat synergistic cross-season gradient phase change energy supply system according to claim 1 is characterized in that: The step of controlling the start / stop device (2) corresponding to the electric heating device (5) and the phase change material (11) filled in each thermal energy storage tank (1) based on a preset control logic comprises: From the first stage heat storage tank to the last stage heat storage tank, the phase change material is stimulated to release heat step by step; wherein the start-stop device (2) corresponding to the phase change material (11) of the first stage heat storage tank is turned on according to the external heat exchange demand, and the start-stop devices (2) corresponding to the phase change material (11) of the subsequent stages of heat storage tanks are turned on when the temperature of the phase change material of the previous stage heat storage tank is less than a first preset temperature threshold; When the temperature data of the phase change material of the last stage thermal energy storage tank is less than a first preset temperature threshold, the controller (3) turns off all start-stop devices (2) and controls the electric heating device (5) to heat the phase change materials (11) in all thermal energy storage tanks (1) simultaneously using valley electricity.

5. The electric-heat synergistic cross-season gradient phase change energy supply system according to claim 1 is characterized in that: Also includes: The working fluid input main pipeline and the working fluid output main pipeline; wherein, The working fluid input main pipeline is used to communicate with the inlet of the heat exchange pipeline of the first-stage thermal energy storage tank, and the working fluid output main pipeline is used to communicate with the outlet of the heat exchange pipeline of the last-stage thermal energy storage tank; A heat exchanger (10) is provided on the working fluid output main pipeline, and the heat exchanger (10) is used to supply heat to the demand end.

6. The electric-heat synergistic cross-season gradient phase change energy supply system according to claim 5 is characterized in that: Also includes: valve (6) and pump (8); wherein, The valve (6) and the pump (8) are used to be arranged in the working fluid input main pipeline or the working fluid output main pipeline.

7. The electric-heat synergistic cross-season gradient phase change energy supply system according to claim 6 is characterized in that: The valve (6) is a solenoid valve or a pneumatic valve.

8. The electric-thermal coordinated cross-season gradient phase change energy supply system according to claim 5 is characterized in that: Also includes: flow meter (7); wherein, The flow meter (7) is used to be arranged in the working medium input main pipeline.

9. The electric-heat synergistic cross-season gradient phase change energy supply system according to claim 5 is characterized in that: Also includes: Working fluid storage device; The outlet of the working fluid storage device is connected to the inlet of the working fluid input main pipeline, and the inlet of the working fluid storage device is connected to the outlet of the working fluid output main pipeline.

10. An operating method of the electric-heat synergistic cross-season gradient phase change energy supply system according to claim 1, characterized in that: The following steps are involved: The working medium to be heat exchanged is introduced into the inlet of the heat exchange pipe of the first-stage heat storage tank, and the working medium after the final heat exchange is introduced into the outlet of the heat exchange pipe of the last-stage heat storage tank; wherein the temperature sensor (4) monitors and collects the temperature of the phase change material (11) in each heat storage tank (1) and outputs it to the controller (3); the controller (3) controls the electric heating device (5) and the start-stop device (2) corresponding to the phase change material (11) filled in each heat storage tank (1) based on the temperature data transmitted by the temperature sensor (4) and the preset control logic; When the electric heating device (5) is controlled based on a preset control logic, the phase change material (11) in the thermal energy storage tank (1) is heated using valley electricity to ensure that the thermal energy storage tank (1) is in an energy storage state; when the start-stop device (2) corresponding to the phase change material (11) filled in each thermal energy storage tank (1) is controlled based on the preset control logic, the phase change material (11) of each thermal energy storage tank (1) is started step by step in a gradient along the flow direction of the working fluid to achieve continuous heat release.

Images