An ultra-high temperature phase change heat storage system and a stable heat release method

Abstract

The present disclosure relates to the field of heat storage technology, and relates to an ultra-high temperature phase change heat storage system and a stable heat release method, wherein the ultra-high temperature phase change heat storage system comprises: an electric heating device, a heat storage device, and a plurality of cup-shaped phase change heat storage capsules are filled in the heat storage device; the electric heating device is at the bottom of the cup body and the top of the cup cover; adjacent cup-shaped phase change heat storage capsule layers contact each other through the bottom surface of the cup body and the top surface of the cup cover to form a contact plane, the electric heating device is laid on the contact plane, and adjacent cup-shaped phase change heat storage capsules have gaps in the radial direction. By electrically heating the phase change heat storage capsules to an ultra-high temperature state, the electrical energy is converted into high phase change latent heat and large temperature change sensible heat, achieving high heat storage density and low cost; by closely arranging the cup-shaped phase change capsules, a good electric heating surface and heat exchange fluid channel are obtained; by means of shunting heat release, the output temperature of the heat storage system is stable and adjustable, and the decoupling control of the output temperature and the output thermal power is achieved.

Description

Technical Field

[0001] The present disclosure relates to the field of heat storage technology, and in particular to an ultra-high temperature phase change heat storage system and a stable heat release method. Background Art

[0002] Energy storage technology can effectively solve the time mismatch problem between the supply and demand sides of the energy system, help to establish an efficient and low-carbon energy structure, meet the overall goal of "2060 Carbon Neutrality", and have broad and far-reaching social and economic benefits. With the rapid emergence of new energy power stations such as photovoltaics and wind power in recent years, a large amount of intermittent and unstable clean electricity is difficult to be used by the user side. For user-side energy consumption such as residents and industry, more than 90% of primary energy is consumed in the form of thermal energy, so heat storage has a large market demand space. The development of efficient, low-cost, modular and reliable heat storage technology is expected to solve the current dilemma of absorbing new energy such as photovoltaics and wind power.

[0003] According to the heat storage principle, heat storage is divided into sensible heat, phase change and thermochemical heat storage. Among them, sensible heat and phase change heat storage are both based on thermophysical processes (heat capacity of temperature change and latent heat of phase change). The technical threshold is relatively low and it is a hot spot in current application research. When the packed bed stores a lot of sensible heat (the temperature of the heat storage cycle changes greatly), since the heat absorption / release is achieved by the increase / decrease of the storage medium temperature, this will cause the corresponding output temperature to increase or decrease. The system cannot achieve a stable temperature heat output, and thus cannot form an efficient absorption / release heat storage cycle. Since this problem is caused by the characteristics of sensible heat storage itself, scholars generally regard it as a shortcoming of sensible heat storage and have not proposed an effective improvement method. The Steinfeld team at the Swiss Federal Institute of Technology tried to add a phase change heat storage or thermochemical heat storage module at the outlet to stabilize and improve the output temperature. However, the improvement effect of phase change heat storage is limited, and the regulation of output temperature is restricted (it can only be stabilized near the melting point of the phase change material); and thermochemical heat storage itself is technically complex and is still in the laboratory research and development stage, far from engineering application.

[0004] It can be seen that there is currently no system or device that can effectively store photovoltaic power, wind power, and valley electricity to effectively store the above clean energy.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0006] The purpose of the present disclosure is to provide an ultra-high temperature phase change heat storage system and a stable heat release method, thereby at least to a certain extent overcoming the problems of photovoltaic, wind power, valley power and other power consumption caused by the limitations and defects of related technologies.

[0007] Other features and advantages of the present disclosure will become apparent from the following detailed description, or may be learned in part by the practice of the present disclosure.

[0008] According to a first aspect of the present disclosure, there is provided an ultra-high temperature phase change heat storage system, comprising:

[0009] An electric heating device and a heat storage device, wherein the heat storage device is filled with multi-layer cup-shaped phase-change heat storage capsules;

[0010] The cup-shaped phase-change heat storage capsule comprises: a cup body; a cup cover, which is buckled on the top open end of the cup body, and a sealing material is filled between the cup body and the cup cover; a phase-change heat storage material is located in the cup body and is used to store heat energy; the electric heating device is at the bottom of the cup body and the top of the cup cover, and heats the phase-change heat storage material in the cup body;

[0011] Adjacent cup-shaped phase-change heat storage capsule layers are in contact with each other through the bottom surface of the cup body and the top surface of the cup cover to form a contact plane. The electric heating device is laid on the contact plane to heat the cup-shaped phase-change heat storage capsules. There is a gap in the radial direction between adjacent cup-shaped phase-change heat storage capsules, and the gap provides a flow and heat exchange channel for the heat exchange fluid during heat release;

[0012] heat release control devices, including flow dividers and mixing structures;

[0013] The inlet end of the diverter is the total flow, and the first outlet end of the diverter is connected to the heat storage device through a pipeline; the second outlet of the diverter is connected to the mixing structure, and the outlet of the heat storage device is connected to the mixing structure through a pipeline; the outlet of the mixing structure is the total flow.

[0014] Optionally, the outer diameter of the cup cover is greater than the outer diameter of the cup body, the cup covers of each layer of adjacent cup-shaped phase change heat storage capsules are arranged side by side, and there is the gap between the cup bodies of two adjacent cup-shaped phase change heat storage capsules.

[0015] Optionally, the electric heating device is an electric heating pad, and the electric heating pad is laid on the contact plane between each layer of the cup-shaped phase change heat storage capsule.

[0016] Optionally, the cup-shaped phase change heat storage capsules are arranged in a packed bed form.

[0017] Optionally, a rotatable baffle is disposed inside the diverter, and the baffle can be rotated to change the flow rate of the first outlet and the flow rate of the second outlet to change the fluid flow entering the heat storage device, thereby adjusting the temperature of the fluid output from the outlet of the mixer.

[0018] According to a second aspect of the present disclosure, a stable heat release method of an ultra-high temperature phase change heat storage system is provided, comprising:

[0019] Adopt the split flow heat release method;

[0020] The total flow is divided into two flows by a splitter, one of which enters the heat storage device for heating, and the other is not heated and is directly mixed with the heated flow in the mixing structure to obtain the required exothermic temperature.

[0021] By adjusting the angle of the baffle of the diverter, the flow ratio of the heat exchange fluid entering the heat storage device is changed, and the temperature of the heat exchange fluid after mixing by the mixing structure is controlled, thereby supplying heat to the heat-using end.

[0022] Optionally, the temperature of the fluid after mixing by the mixing structure is used as the objective function, and based on the PID algorithm, the required angle of the baffle is calculated, and the flow entering the heat storage device is adjusted so that the objective function reaches the heating temperature of the heat-using end.

[0023] The present invention discloses an ultra-high temperature phase change heat storage system and a stable heat release method, wherein the ultra-high temperature phase change heat storage system comprises: an electric heating device, a heat storage device, wherein the heat storage device is filled with multiple layers of cup-shaped phase change heat storage capsules; the cup-shaped phase change heat storage capsules comprise: a cup body; a cup cover, which is buckled on the top open end of the cup body, and a sealing material is filled between the cup body and the cup cover; a phase change heat storage material is located in the cup body and is used to store heat energy; the electric heating device is located at the bottom of the cup body and the top of the cup cover to heat the phase change heat storage material in the cup body; adjacent cup-shaped phase change heat storage capsule layers are connected through the bottom of the cup body. The surface and the top surface of the cup cover are in contact with each other to form a contact plane, the electric heating device is laid on the contact plane, and is used to heat the cup-shaped phase change heat storage capsule, and there is a gap in the radial direction between adjacent cup-shaped phase change heat storage capsules, and the gap provides a flow and heat exchange channel for the heat exchange fluid during heat release; the heat release control device includes a diverter and a mixing structure; the inlet end of the diverter is the total flow stream, and the first outlet end of the diverter is connected to the heat storage device through a pipeline; the second outlet of the diverter is connected to the mixing structure, and the outlet of the heat storage device is connected to the mixing structure through a pipeline; the outlet of the mixing structure is the total flow stream. By electrically heating the phase change heat storage capsules to an ultra-high temperature state, electrical energy is converted into high phase change latent heat and large temperature change sensible heat, thereby achieving high heat storage density and low cost; by closely arranging the cup-shaped phase change capsules, a good electric heating surface and heat exchange fluid channel are obtained; by means of shunting heat release, the output temperature of the heat storage system is made stable and adjustable, and decoupling control of the output temperature and output thermal power is achieved. It can be seen that the present invention can solve the problem of large-scale consumption of photovoltaic, wind power, valley electricity, etc.

[0024] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0026] Figure 1 Schematic diagram of an ultra-high temperature phase change heat storage system provided in this example embodiment.

[0027] Figure 2 It is a schematic diagram of the structure of the adjustable shunt provided in this example implementation.

[0028] Figure 3 Comparison between (a) a general exothermic process and (b) the stable exothermic method proposed in the present invention.

[0029] Figure 4 This is a diagram showing the filling effect of the cup-shaped phase change capsule provided in this exemplary embodiment.

[0030] Figure 5 Schematic diagram of the structure of the cup-shaped phase change capsule provided in this exemplary embodiment.

[0031] In the figure, 1. total flow; 2. diverter; 3. flow entering the heat storage device; 4. flow not entering the heat storage device; 5. mixing structure; 6. baffle; 7. gap; 8. electric heating pad; 9. phase change heat storage material; 10. heat storage device; 11. cup cover; 12. cup body; 13. sealing material. DETAILED DESCRIPTION

[0032] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the disclosure will be more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0033] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0034] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0035] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all contents and operations / steps, nor do they have to be executed in the order described. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0036] The present invention aims to solve the problems of photovoltaic, wind power, valley power and other power consumption, and proposes an ultra-high temperature phase change heat storage system and a stable heat release method. Through electric heating, cup-shaped phase change capsules and heat release control, the ultra-high heat storage density composed of high phase change latent heat and large temperature change sensible heat is achieved, and the heat storage cost is effectively reduced.

[0037] First, according to the first aspect of the present disclosure, an ultra-high temperature phase change heat storage system is provided, comprising: an electric heating device, a heat storage device, wherein the heat storage device is filled with multiple layers of cup-shaped phase change heat storage capsules; the cup-shaped phase change heat storage capsules comprise: a cup body; a cup cover, which is buckled on the top open end of the cup body, and a sealing material is filled between the cup body and the cup cover; a phase change heat storage material is located in the cup body and is used to store thermal energy; the electric heating device heats the phase change heat storage material in the cup body at the bottom of the cup body and the top of the cup cover; adjacent layers of cup-shaped phase change heat storage capsules are connected by the bottom surface of the cup body and the top of the cup cover. The top surfaces of the covers are in contact with each other to form a contact plane, the electric heating device is laid on the contact plane and is used to heat the cup-shaped phase change heat storage capsules, and there is a gap in the radial direction between adjacent cup-shaped phase change heat storage capsules, and the gap provides a flow and heat exchange channel for the heat exchange fluid during heat release; the heat release control device includes a diverter and a mixing structure; the inlet end of the diverter is the total flow stream, and the first outlet end of the diverter is connected to the heat storage device through a pipeline; the second outlet of the diverter is connected to the mixing structure, and the outlet of the heat storage device is connected to the mixing structure through a pipeline; the outlet of the mixing structure is the total flow stream.

[0038] In this example implementation, the present application provides an ultra-high temperature phase change heat storage system and a stable heat release method, which heats the high temperature phase change capsules to above 1000°C through low-cost electricity such as wind power, photovoltaics, and valley electricity. The phase change capsules are arranged in the form of a packed bed. The phase change capsules adopt a cup-shaped design, and the protruding distance of the cup cover from the cup body serves as a gap 7 for the heat exchange fluid to pass through during heat release. The bottom and top of the cup are flat, which facilitates the electric heating pad to perform efficient surface heating. The heat exchange fluid uses an inert gas such as argon to increase the cycle stability and life of the high temperature material. A bracket is used to prevent the phase change capsule packed bed from directly contacting the insulation layer of the heat storage device 10 to reduce heat storage losses.

[0039] Compared with existing large-scale energy storage technologies, the present invention has at least the following beneficial effects:

[0040] The heat storage bed can be uniformly heated to an ultra-high temperature of more than 1000°C by electric heat storage. Combined with the phase change latent heat of the phase change material itself, ultra-high heat storage density and low cost can be achieved. The cup-shaped phase change capsule can be used to heat the cup cover and the cup bottom plane by using an electric heating pad (8) to achieve a rapid surface heating effect. After the cup-shaped capsules are tightly arranged and filled, the cup cover and the cup body form a channel for the heat exchange fluid, ensuring that the filling bed structure is uniform and convenient for heat release design optimization. Through the stable heat release method, the output temperature is made stable and adjustable, and the decoupling control of the output temperature and the output thermal power is achieved.

[0041] In this example embodiment, the present invention discloses an ultra-high temperature phase change heat storage system and a stable heat release method, wherein the ultra-high temperature phase change heat storage system includes: an electric heating device, a heat storage device, wherein the heat storage device is filled with multiple layers of cup-shaped phase change heat storage capsules; the cup-shaped phase change heat storage capsules include: a cup body; a cup cover, which is buckled on the top open end of the cup body, and a sealing material is filled between the cup body and the cup cover; a phase change heat storage material is located in the cup body and is used to store thermal energy; the electric heating device heats the phase change heat storage material in the cup body at the bottom of the cup body and the top of the cup cover; adjacent cup-shaped phase change heat storage capsule layers are connected by the The bottom surface of the cup body and the top surface of the cup cover contact each other to form a contact plane. The electric heating device is laid on the contact plane to heat the cup-shaped phase change heat storage capsule. There is a gap between adjacent cup-shaped phase change heat storage capsules in the radial direction, and the gap provides a flow and heat exchange channel for the heat exchange fluid during heat release; the heat release control device includes a diverter and a mixing structure; the inlet end of the diverter is the total flow stream, and the first outlet end of the diverter is connected to the heat storage device through a pipeline; the second outlet of the diverter is connected to the mixing structure, and the outlet of the heat storage device is connected to the mixing structure through a pipeline; the outlet of the mixing structure is the total flow stream. By electrically heating the phase change heat storage capsules to an ultra-high temperature state, electrical energy is converted into high phase change latent heat and large temperature change sensible heat, thereby achieving high heat storage density and low cost; by closely arranging the cup-shaped phase change capsules, a good electric heating surface and heat exchange fluid channel are obtained; by means of shunting heat release, the output temperature of the heat storage system is made stable and adjustable, and decoupling control of the output temperature and output thermal power is achieved. It can be seen that the present invention can solve the problem of large-scale consumption of photovoltaic, wind power, valley electricity, etc.

[0042] In a specific embodiment, the outer diameter of the cup cover is greater than the outer diameter of the cup body, the cup covers of each layer of adjacent cup-shaped phase change heat storage capsules are arranged side by side, and there is a gap between the cup bodies of two adjacent cup-shaped phase change heat storage capsules.

[0043] In a specific embodiment, the electric heating device is an electric heating pad, and the electric heating pad is laid on the contact plane between each layer of the cup-shaped phase change heat storage capsule.

[0044] In a specific embodiment, a rotatable baffle is disposed inside the diverter, and the baffle can be rotated to change the flow rate of the first outlet and the flow rate of the second outlet, so as to change the fluid flow entering the heat storage device, thereby adjusting the temperature of the fluid output from the outlet of the mixer.

[0045] Through the above arrangement, stable heat release can be achieved. Specifically, the stable heat release method is: by dividing the heat exchange fluid into two streams, one stream enters the heat storage device 10 to be heated or cooled, and then is fully mixed with the other stream before output. By adjusting the flow entering the heat storage device 10, a reasonable ratio of the two cold and hot fluids is achieved, so that the final output temperature is stabilized near the set temperature. During the adjustment process, the total flow of the heat exchange fluid is constant, ensuring the stability of the output temperature under constant thermal power. In addition, when adjusting the flow, the output temperature is unchanged, so that the power control and output temperature control of the heat storage device 10 during the heat release process are decoupled.

[0046] Combined with Figure 1-Figure 5 As shown, the present application provides an ultra-high temperature phase change heat storage system, including electric heating, cup-shaped phase change heat storage capsules and heat release control. The cup-shaped phase change heat storage capsule is arranged in the form of a packed bed, and electric heating pads 8 are laid on the bottom and top planes of the cup for surface heating; the protruding gap 7 between the cup cover and the cup body serves as a heat exchange fluid channel during heat release; during heat release, the heat exchange fluid is divided into two streams and a stream body entering the heat storage device 10 for heat exchange, and then fully mixed with the other stream body for output. The cup-shaped phase change capsule consists of a cup cover, a cup body, a sealing material and a phase change heat storage material 9. The two stream bodies are diverted by an adjustable diverter 2, and its built-in rotatable baffle 6 can adjust the flow distribution of streams 3 and 4. Furthermore, by using the rotatable baffle 6 as an actuator and adjusting the rotation angle of the baffle 6, the flow distribution of stream 3 and stream 4 can be changed; after being mixed by the mixing structure 5, the mixed streams are used to supply heat to the heat end. It can be seen that the present application can use the rotation angle of the baffle 6 as the control quantity and the output temperature of the mixing structure 5 as the controlled quantity, thereby achieving stabilization and effective regulation of the output temperature.

[0047] According to a second aspect of the present disclosure, a stable heat release method for an ultra-high temperature phase change heat storage system is provided, comprising: steps S110 to S130.

[0048] Step S110: using a split flow heat release method;

[0049] Step S120. The total flow stream is divided into two flow streams by a flow splitter, one of which enters the heat storage device for heating, and the other is not heated and is directly mixed with the heated flow stream in the mixing structure to obtain the required exothermic temperature.

[0050] Step S130. By adjusting the angle of the baffle of the diverter, the flow ratio of the heat exchange fluid entering the heat storage device is changed, and the temperature of the heat exchange fluid after mixing by the mixing structure is controlled, thereby supplying heat to the heat-using end.

[0051] In a specific embodiment, the steps of configuring corresponding fluid distribution parameters based on the heating temperature, the current temperature of the heat storage device 10 and the flow rate of the fluid include: taking the temperature of the fluid after mixing by the mixing structure as the objective function, calculating the required angle of the baffle based on the PID algorithm, and adjusting the flow entering the heat storage device so that the objective function reaches the heating temperature of the heating end.

[0052] The present invention discloses an ultra-high temperature phase change heat storage system and a stable heat release method. When charging, the high temperature phase change capsules are heated to above 1000°C by low-cost electricity such as wind power, photovoltaic power, and valley power. The phase change capsules are tightly arranged in a heat storage device 10 in the form of a packed bed. The phase change capsules adopt a cup-shaped design. The protruding distance of the cup cover from the cup body serves as a gap 7 for the heat exchange fluid to pass through when releasing heat. The bottom and top of the cup are flat. An electric heating pad 8 is used for efficient surface heating. The cup is filled with a phase change heat storage material 9.

[0053] When exothermic, refer to Figure 1 The total flow stream 1 of the heat exchange fluid is divided into two flows by the adjustable splitter 2, and the flow stream 3 enters the heat storage device 10 to be heated or cooled, and then is fully mixed with the flow stream 4 in the mixing structure 5, and then output.

[0054] Specifically, the adjustable diverter 2 can be found in Figure 2 The cross-sectional areas of stream 3 and stream 4 can be adjusted by the rotatable baffle 6, thereby achieving flow regulation of the two streams while keeping the total flow constant.

[0055] Furthermore, the baffle plate 6 is used as a control actuator, and its rotation angle is adjusted, so that the temperature of the fluid after being fully mixed by the mixing structure 5 is used as the controlled variable. The output temperature can be effectively controlled to be stable near the set value through the PID algorithm.

[0056] Here, we take the sensible heat release process of a high-temperature packed bed as an example to demonstrate the effect of this method on output temperature stabilization based on numerical simulation. Figure 3 In this case, the initial temperature of the bed is 1000℃, and the inlet temperature of the heat exchange fluid is 60℃. Figure 3 b shows the dynamic curves of the output temperature when the set values ​​are 100 and 200° C. It can be seen that the stable heat release method proposed in the present invention can effectively stabilize the output temperature of the packed bed heat storage device 10 near the set value, and the set value is flexibly adjustable.

[0057] The heat exchange fluid is an inert gas such as argon to increase the cycle stability and life of the high temperature material. A support is used to prevent the phase change capsule filling bed from directly contacting the heat insulation layer of the heat storage device 10 to reduce heat storage loss.

[0058] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and examples are to be considered as exemplary only, and the true scope and spirit of the present disclosure are indicated by the claims.

[0059] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An ultra-high temperature phase change heat storage system, characterized in that: include: An electric heating device and a heat storage device (10), wherein the heat storage device (10) is filled with multiple layers of cup-shaped phase-change heat storage capsules; The cup-shaped phase-change heat storage capsule comprises: a cup body; a cup cover, which is buckled on the top open end of the cup body, and a sealing material is filled between the cup body and the cup cover; a phase-change heat storage material (9) is located in the cup body and is used to store heat energy; the electric heating device is located at the bottom plane of the cup body and the top plane of the cup cover to heat the phase-change heat storage material (9) in the cup body; Adjacent cup-shaped phase-change heat storage capsule layers are in contact with each other through the bottom plane of the cup body and the top plane of the cup cover to form a contact plane, and the electric heating device is laid on the contact plane to heat the cup-shaped phase-change heat storage capsules. There is a gap (7) between adjacent cup-shaped phase-change heat storage capsules in the radial direction, and the gap (7) provides a flow and heat exchange channel for the heat exchange fluid during heat release; A heat release control device, comprising a flow divider (2) and a mixing structure (5); The inlet end of the flow splitter (2) is the total flow stream, and the first outlet end of the flow splitter (2) is connected to the heat storage device (10) through a pipeline; the second outlet of the flow splitter (2) is connected to the mixing structure (5), and the outlet of the heat storage device (10) is connected to the mixing structure (5) through a pipeline; the outlet of the mixing structure (5) is the total flow stream.

2. The ultra-high temperature phase change heat storage system according to claim 1, characterized in that: The outer diameter of the cup cover is greater than the outer diameter of the cup body, the cup covers of each layer of adjacent cup-shaped phase-change heat storage capsules are arranged side by side and in close proximity, and there is a gap (7) between the cup bodies of two adjacent cup-shaped phase-change heat storage capsules.

3. The ultra-high temperature phase change heat storage system according to claim 1, characterized in that: The electric heating device is an electric heating pad (8), and the electric heating pad (8) is laid on the contact plane between each layer of the cup-shaped phase change heat storage capsule.

4. The ultra-high temperature phase change heat storage system according to claim 1, characterized in that: The cup-shaped phase change heat storage capsules are arranged in a packed bed form.

5. The ultra-high temperature phase change heat storage system according to claim 1, characterized in that: The diverter (2) is internally provided with a rotatable baffle (6), and the baffle (6) can be rotated to change the flow rate of the first outlet and the flow rate of the second outlet, thereby changing the flow rate of the fluid entering the heat storage device (10), thereby adjusting the temperature of the fluid output from the outlet of the mixing structure.

6. A stable heat release method for an ultra-high temperature phase change heat storage system according to claim 5, characterized in that: include: Adopt the split flow heat release method; The total flow stream is divided into two flow streams by the flow splitter (2), one of which enters the heat storage device (10) for heating, and the other of which is not heated and is directly mixed with the heated flow stream in the mixing structure to obtain the required exothermic temperature; By adjusting the angle of the baffle (6) of the diverter (2), the flow ratio of the heat exchange fluid entering the heat storage device (10) is changed, and the temperature of the heat exchange fluid after mixing through the mixing structure (5) is controlled, thereby supplying heat to the heat-using end.

7. The stable heat release method according to claim 6, characterized in that: include: The temperature of the fluid after mixing by the mixing structure (5) is used as the objective function, and based on the PID algorithm, the required angle of the baffle (6) is calculated, and the flow entering the heat storage device (10) is adjusted so that the objective function reaches the heating temperature of the heat-using end.

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