Novel modular phase change thermal storage and phase change thermal storage bank

Abstract

The application discloses a novel modular phase change heat accumulator and a phase change heat accumulator group, which comprise a heat accumulator box, a phase change material and a heat exchange pipe, the heat accumulator box is provided with a heat storage liquid inlet, a heat release liquid outlet, a heat storage liquid outlet and a heat storage liquid inlet, and the heat exchange pipe is arranged in the phase change material; an integrated top header is arranged at the upper portion of the heat accumulator box, an integrated bottom header is arranged at the lower portion of the heat accumulator box, a top precooling interlayer is arranged between the top header and the phase change material, a bottom preheating interlayer is arranged between the bottom header and the phase change material, the heat storage liquid inlet is communicated with the bottom preheating interlayer, the heat storage liquid outlet is communicated with the bottom header, the heat storage liquid inlet is communicated with the top precooling interlayer, and the heat release liquid outlet is communicated with the top header. The application integrates the header and the heat accumulator box, the heat accumulator box is simple and regular in shape, is favorable for modular installation and application, is compact in structure, can reduce the heat preservation cost of the heat accumulator and heat loss, and improves the heat storage energy efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage and heat storage, and particularly relates to a novel modular phase change heat accumulator and a phase change heat accumulator group. BACKGROUND

[0002] Solar energy, as an easily accessible renewable clean energy, has attracted widespread attention, but its intermittent and random nature leads to low energy utilization efficiency. In addition, there is a large amount of waste heat in industrial processes that needs to be utilized. Therefore, the combination of solar energy, industrial waste heat and heat storage technology can effectively realize energy recovery and reasonable distribution, solve the mismatch of energy supply and demand in time and space, and improve energy utilization efficiency.

[0003] In the heat storage system, the phase change heat accumulator is the core component for realizing energy storage and transmission. It relies on the latent heat effect of the solid-liquid phase change of the internal phase change material to realize energy storage and release. The phase change heat storage unit is usually composed of two parts of phase change material packaging and heat transfer fluid pipeline. Due to the influence of natural convection effect, the existing phase change heat accumulator generally has a phase change "dead zone" problem. During heat storage, the phase change material at the top of the heat accumulator melts quickly under the driving of buoyancy, while the melting rate of the phase change material at the bottom is extremely slow, forming a "dead zone" of bottom melting. During heat release, the phase change material temperature decreases and solidifies, the density increases and sinks, and the phase change material at the top is often difficult to solidify, forming a "dead zone" of top solidification. Therefore, optimizing the structure of the phase change heat accumulator and improving the heat storage and release performance of the phase change "dead zone" of the heat accumulator are of great significance for efficient energy storage and release.

[0004] Patent document CN107062972A discloses a flat tube type phase change heat accumulator, mainly including a flat tube assembly, a box body, a phase change material and a heat storage and release loop. The flat tube assembly is a cavity structure sealed by two parallel plate heat exchange surfaces, which is divided into multiple sealed cavities and filled with phase change material. The outer surface of the plate heat exchange surface is provided with fins, and the fins form a gas channel, which increases the air side heat exchange area and improves the rate and efficiency of phase change heat storage and release. However, this heat accumulator is mainly suitable for gaseous medium, and the internal phase change material has no reinforcing fin structure, which easily leads to uneven heat storage and release. At the same time, the phase change material in the heat storage box adopts an assembly insertion type design. Compared with the finned tube insertion type, the phase change material has a small filling amount and a small heat storage capacity.

[0005] Patent document CN206094972U discloses a shell and tube type phase change heat accumulator, mainly comprising cold and hot fluid storage tank bodies, a heat storage tank body and heat exchange finned tube bundles, the cold and hot fluid storage tank bodies are located above and below the heat storage tank body respectively, the heat storage tank body is arranged with the heat exchange finned tube bundles, and the space between the heat exchange finned tube bundles is filled with phase change material. The accumulator utilizes the finned tube strengthening and the cooling and heating effects of the cold and hot fluid storage tank bodies, and improves the internal temperature stratification and local overheating phenomena of the accumulator. However, the heat exchange tube bundles inside the accumulator lack uniform distribution devices, and it is difficult to ensure uniform flow in the parallel tube bundles, thereby causing uneven phase change process of the accumulator and existing dead zones. Meanwhile, the fluid and phase change material in the heat storage and heat release process of the accumulator are arranged in series for convective heat exchange, the heat exchange temperature difference is small, and the heat storage capacity is limited. SUMMARY

[0006] In order to overcome the deficiencies existing in the prior art, the present application provides a novel modular phase change heat accumulator. The present application integrates the header tank and the heat accumulator tank body into one, replaces the traditional external header tank, makes the heat accumulator tank body more simple and regular in shape, is conducive to modular installation and application, and has a more compact structure, which can reduce the heat preservation cost and heat loss of the heat accumulator and improve the heat storage energy efficiency.

[0007] The present application also provides a phase change heat accumulator group.

[0008] The technical scheme adopted by the present application to solve the technical problems is:

[0009] A novel modular phase change heat accumulator, comprising a heat accumulator tank body, phase change material and heat exchange tubes, the phase change material is packaged inside the heat accumulator tank body, the heat accumulator tank body adopts a sealed frame structure composed of tank walls, a heat storage liquid inlet and a heat release liquid outlet are arranged on the left side of the heat accumulator tank body, a heat storage liquid outlet and a heat release liquid inlet are arranged on the right side of the heat accumulator tank body, and a plurality of heat exchange tubes are arranged in the phase change material; an integrated top header tank is arranged on the upper part of the heat accumulator tank body, an integrated bottom header tank is arranged on the lower part of the heat accumulator tank body, a top pre-cooling interlayer is arranged between the top header tank and the phase change material, a bottom pre-heating interlayer is arranged between the bottom header tank and the phase change material, the heat storage liquid inlet is in communication with the bottom pre-heating interlayer, the heat storage liquid outlet is in communication with the bottom header tank, the heat release liquid inlet is in communication with the top pre-cooling interlayer, and the heat release liquid outlet is in communication with the top header tank.

[0010] The tank walls comprise a tank front wall, a tank rear wall, a tank left wall, a tank right wall, a tank bottom plate and a tank top plate which are connected together, and the tank walls all adopt an intermediate heat insulation interlayer structure.

[0011] The phase change material is separated from the bottom preheating interlayer by the lower heat-conducting hole plate with excellent heat transfer performance, and is separated from the top precooling interlayer by the top heat-conducting hole plate with excellent heat transfer performance, the phase change material is enclosed in the space formed by the box front wall, the box rear wall, the phase change material left wall surface, the phase change material right wall surface, the lower heat-conducting hole plate, the top heat-conducting hole plate, the phase change material left wall surface and the phase change material right wall surface are both made of metal plate structure with excellent heat conduction performance, the opening positions on the heat-conducting hole plate correspond to the positions of the heat exchange pipes one by one, the heat exchange pipes pass through the corresponding holes, and the heat exchange pipes and the heat-conducting hole plate are welded and sealed at the contact positions.

[0012] The bottom preheating interlayer and the bottom header, and the top precooling interlayer and the top header are both separated by the heat-insulating hole plate, the opening positions on the heat-insulating hole plate correspond to the positions of the heat exchange pipes one by one, the heat exchange pipes are connected to the top header and the bottom header through the heat-insulating hole plate, and the heat exchange pipes and the heat-insulating hole plate are welded and sealed at the contact positions.

[0013] The box left wall and the box right wall are both provided with the interlayer flow channel, the interlayer flow channel includes the left interlayer flow channel and the right interlayer flow channel, the left interlayer flow channel is the space formed by the box front wall, the box rear wall, the box left wall and the phase change material left wall surface, the right interlayer flow channel is the space formed by the box front wall, the box rear wall, the box right wall and the phase change material right wall surface, the right interlayer flow channel is connected to the bottom preheating interlayer and the top header, and the left interlayer flow channel is connected to the top precooling interlayer and the bottom header.

[0014] The top header is provided with the one-way flow device between the top header and the box interlayer flow channel.

[0015] The bottom header and the top header are both provided with the flow equalizing hole plate, and the flow equalizing hole plate is connected and fixed to the box front wall and the box rear wall.

[0016] The heat exchange pipes are vertically installed and arranged in the phase change material in the order or staggered order, the heat exchange fins are installed on the heat exchange pipes, and the heat exchange fins are arranged uniformly or non-uniformly on the heat exchange pipes.

[0017] The length, the height and the width of the heat accumulator box are 0.5-50 m, the number of the heat exchange pipes is 2-500, and the diameter d is 1-50 mm.

[0018] A phase change heat accumulator group includes not less than two groups of modular phase change heat accumulators, the modular phase change heat accumulators adopt the novel modular phase change heat accumulator, and each group of the modular phase change heat accumulators is connected in series to form a modular phase change heat accumulator connection system.

[0019] Or each group of the modular phase change heat accumulators is connected in parallel to form a modular phase change heat accumulator connection system.

[0020] The beneficial effects of the present application are:

[0021] 1. The new modular phase change heat accumulator proposed by the present application integrates the hot fluid header and the heat accumulator box into one, replacing the traditional external header, making the heat accumulator box more compact and regular, facilitating modular installation and application, and at the same time, making the structure more compact, reducing heat dissipation loss and heat preservation cost of the heat accumulator, and improving the energy efficiency of the heat accumulator.

[0022] 2. The new modular phase change heat accumulator proposed by the present application encapsulates the phase change material inside the heat accumulator box. During heat storage, the hot fluid first enters the bottom preheating interlayer between the bottom header and the phase change material, and the hot fluid directly heats the bottom phase change material through the heat-conducting hole plate with excellent heat transfer performance. During heat release, the cold fluid first enters the top pre-cooling interlayer between the top header and the phase change material, and the top phase change material is cooled through the heat-conducting hole plate. Such arrangement increases the heat exchange area between the fluid and the phase change material, strengthens the natural convection effect of the top and bottom phase change materials during solidification and melting, shortens the melting and solidification time, and improves the heat storage and release characteristics of the top and bottom phase change "dead zones".

[0023] 3. The interlayer flow channel is arranged between the left and right side walls of the heat accumulator box and the phase change material. During heat storage, the hot fluid flows from the bottom preheating interlayer to the top header through the interlayer flow channel, and then flows downward into the bottom header through the heat exchange pipe. During heat release, the cold fluid flows from the top pre-cooling interlayer to the bottom header through the interlayer flow channel, and then flows upward into the top header through the heat exchange pipe. Such reverse flow design can ensure that the flow direction of the fluid is opposite to the natural convection direction of the phase change material, increase the heat exchange temperature difference between the fluid and the phase change material during heat storage and release, and improve the heat storage and release efficiency of the phase change heat accumulator.

[0024] 4. The heat insulation hole plate is arranged between the bottom preheating interlayer and the bottom header, and between the top pre-cooling interlayer and the top header, which can prevent heat exchange between the cold and hot fluids before and after heat exchange in the interlayer and the header, and improve the efficiency of the heat accumulator.

[0025] 5. The flow equalizing hole plate arranged in the top and bottom headers can ensure that the flow of the fluid into each heat exchange pipe is more uniform, making the temperature distribution of the phase change material at different positions in the box more uniform, and further improving the influence of the phase change "dead zone".

[0026] 6. The one-way flow device arranged between the top header and the interlayer flow channel can prevent the backflow of the heat release fluid, and improve the heat release efficiency of the heat accumulator.

[0027] 7. The heat exchange fins are installed on the heat exchange pipe, which increases the heat exchange area and strengthens the heat exchange between the fluid and the phase change material.

[0028] 8. The modular phase change thermal storage device of the present application is connected in series to form a modular phase change thermal storage device connection system, which has the advantage that energy can be stored step by step according to the temperature range of the phase change material and the heat carrier fluid, facilitating the step-by-step use of the heat storage and release process. For example, industrial waste steam at a temperature of 130°C enters the first stage phase change thermal storage device, becomes hot water at 80°C after heat storage, enters the second stage phase change thermal storage device, becomes hot water at 50°C after heat storage, and enters the third stage phase change thermal storage device to complete the heat storage. During heat release, the first stage phase change thermal storage device has the highest temperature and can produce steam at 110°C for industrial drying, power generation, sterilization, etc. The second stage phase change thermal storage device can produce hot water at 70°C for residential heating, and the third stage phase change thermal storage device can produce hot water at 40°C for daily bathing, etc., realizing the step-by-step use of heat storage.

[0029] 9. The modular phase change thermal storage device of the present application is connected in parallel to form a modular phase change thermal storage device connection system. This parallel connection system has the advantage that it can be easily expanded according to the needs of energy storage and heat storage production scale. The phase change thermal storage device of the present application is rectangular in shape, with a regular shape, compact structure, and simple interface. When the heat storage capacity needs to be increased, modular parallel connection can be performed without affecting the original heat storage system, realizing rapid expansion. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structural schematic diagram of the new modular phase change thermal storage device of the present application;

[0031] Figure 2 is a schematic diagram of the new modular phase change thermal storage device of the present application with heat exchange pipes arranged in a straight line;

[0032] Figure 3 is a schematic diagram of the new modular phase change thermal storage device of the present application with heat exchange pipes arranged in a forked line;

[0033] Figure 4 is a schematic diagram of the new modular phase change thermal storage device of the present application with heat exchange pipes arranged in a forked line;

[0034] Figure 5 is a schematic diagram of the new modular phase change thermal storage device of the present application with heat exchange pipes arranged in a forked line;

[0035] Figure 6 is a schematic diagram of the new modular phase change thermal storage device of the present application with heat exchange pipes arranged in a forked line;

[0036] Figure 7 is a schematic diagram of the new modular phase change thermal storage device of the present application with heat exchange pipes arranged in a forked line.

[0037] In the diagram, 1. Heat storage return liquid outlet, 2. Insulating perforated plate, 3. Heat conducting perforated plate, 4. Heat storage tank, 5. Insulation jacket, 6. Phase change material, 7. Heat exchange fins, 8. Heat exchange tubes, 9. Heat storage supply liquid inlet, 10. One-way flow device, 11. Flow equalization perforated plate, 12. Heat release return liquid outlet, 13. Jacket flow channel, 14. Heat storage supply liquid inlet, 15. Bottom preheating jacket, 16. Top precooling jacket, 17. Top header, 18. Bottom header, d. Heat exchange tube diameter, s1. Lateral spacing of finned tubes, s2. Longitudinal spacing of finned tubes. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments.

[0039] Example 1

[0040] like Figures 1-5 As shown, a novel modular phase change heat storage device includes a heat storage box 4, a phase change material 6, and heat exchange tubes 8. The phase change material 6 is encapsulated inside the heat storage box 4, and multiple heat exchange tubes 8 are placed in the phase change material 6. The heat storage box 4 adopts a sealed frame structure composed of box walls. The box walls include a front wall, a rear wall, a left wall, a right wall, a bottom plate, and a top plate connected to each other. Each box wall is provided with a heat insulation interlayer structure 5 in the middle.

[0041] The heat accumulator housing 4 has an integrated top header 17 at the top and an integrated bottom header 18 at the bottom. A top precooling interlayer 16 is provided between the top header 17 and the phase change material 6, and a bottom preheating interlayer 15 is provided between the bottom header 18 and the phase change material 6. The length, height, and width of the heat accumulator housing 4 are all 0.5 to 50 m.

[0042] A sandwich flow channel 13 is provided between the left wall and the right wall of the box and the phase change material 6. The sandwich flow channel 13 includes a left sandwich flow channel and a right sandwich flow channel. The left sandwich flow channel is the space constructed by the front wall, rear wall, left wall of the box and the left wall surface of the phase change material. The right sandwich flow channel is the space constructed by the front wall, rear wall, right wall of the box and the right wall surface of the phase change material. The right sandwich flow channel is connected to the bottom preheating sandwich layer 15 and the top header 17. The left sandwich flow channel is connected to the top precooling sandwich layer 16 and the bottom header 18.

[0043] The left side of the heat accumulator tank 4 is provided with a heat storage liquid inlet 14 and a heat release liquid outlet 12, and the right side is provided with a heat storage liquid outlet 1 and a heat storage liquid inlet 9. The heat storage liquid inlet 14 is connected with the bottom preheating interlayer 15, the heat storage liquid outlet 1 is connected with the bottom header tank 18, the heat storage liquid inlet 9 is connected with the top precooling interlayer 16, and the heat release liquid outlet 12 is connected with the top header tank 17.

[0044] The internal phase change material 6 is separated from the bottom preheating interlayer 15 by the lower heat-conducting hole plate 3 with excellent heat transfer performance, and the phase change material 6 is separated from the top precooling interlayer 16 by the top heat-conducting hole plate 3 with excellent heat transfer performance. The phase change material 6 is encapsulated in a space surrounded by the tank front wall, the tank rear wall, the phase change material left wall, the phase change material right wall, the lower heat-conducting hole plate, and the top heat-conducting hole plate. The phase change material left wall and the phase change material right wall are both made of a metal plate structure with excellent heat conduction performance. The opening positions on the heat-conducting hole plate 3 correspond to the positions of the heat exchange pipes 8 one by one. The heat exchange pipes 8 pass through the corresponding holes, and the heat exchange pipes are welded and sealed at the contact positions with the heat-conducting hole plate 3. During heat storage, the hot fluid entering the bottom preheating interlayer can directly heat the bottom phase change material, and during heat release, the cold fluid entering the top precooling interlayer can directly cool the top phase change material, thereby strengthening the natural convection effect of the phase change material during phase change and improving the heat storage and release characteristics of the top and bottom phase change "dead zones".

[0045] The bottom preheating interlayer 15 and the bottom header tank 18, and the top precooling interlayer 16 and the top header tank 17 are both separated by the heat insulation hole plate 2. The opening positions on the heat insulation hole plate 2 correspond to the positions of the heat exchange pipes 8 one by one. The heat exchange pipes 8 pass through the heat insulation hole plate 2 and are connected with the top header tank 17 and the bottom header tank 18, respectively. The heat exchange pipes 8 are welded and sealed at the contact positions with the heat insulation hole plate 2. Through the heat insulation effect of the heat insulation hole plate 2, heat exchange between the cold and hot fluids on both sides of the heat insulation hole plate before and after heat exchange can be avoided, and the efficiency of the heat accumulator can be reduced.

[0046] The top header tank 17 is provided with a one-way flow device 10 between the tank interlayer flow channel 13. The one-way flow device 10 prevents the backflow of heat release fluid and affects the heat release efficiency of the heat accumulator.

[0047] The bottom header tank 18 and the top header tank 17 are arranged with flow equalization hole plates 11, which are respectively connected and fixed with the tank front wall and the tank rear wall, so as to ensure that the flow in each heat exchange pipe is more uniform, and the heat storage and release temperature distribution of the phase change material at different positions in the tank is more uniform.

[0048] As shown in Figure 2 and Figure 3 , the heat exchange pipes 8 are vertically installed and arranged in the phase change material 6 in a straight or staggered manner.

[0049] The heat exchange fins 7 are installed on the heat exchange pipes 8, and the heat exchange fins are arranged uniformly or non-uniformly on the heat exchange pipes. The number of the heat exchange pipes is 2-500, the diameter d is 1-50 mm, the ratio of the transverse spacing s1 to the diameter d is 0.1-10, and the ratio of the longitudinal spacing s2 to the diameter d is 0.1-10.

[0050] As shown in Figure 4 As shown in

[0051] As shown in Figure 5 As shown in

[0052] In the heat storage process, the bottom preheating layer is used to heat the bottom phase change material, and in the heat release process, the top precooling layer is used to cool the top phase change material, so that the melting and solidification characteristics of the phase change "dead zone" phase change material are improved. In the heat storage process, the hot fluid flows downward, and in the heat release process, the cold fluid flows upward, which is opposite to the direction of the natural convection of the phase change material. The counterflow design can increase the heat transfer temperature difference between the fluid and the phase change material in the heat storage and release process, and improve the heat storage and release efficiency of the phase change heat accumulator. The header and the heat accumulator tank are integrated, which replaces the traditional external header, makes the heat accumulator tank more simple and regular in shape, is beneficial to the modular installation and application, and at the same time, the structure is more compact, which can reduce the heat preservation cost and heat loss of the heat accumulator, and improve the heat storage energy efficiency. The flow distribution hole plate is additionally arranged in the header, which can make the fluid flow in each heat exchange pipe more uniform, so as to improve the uniformity of the phase change material in the heat storage and release process.

[0053] Example 2

[0054] AsFigure 4 , Figure 5 , Figure 6 As shown, a phase change heat storage unit includes at least two sets of modular phase change heat storage units, wherein the modular phase change heat storage units are connected in series to form a modular phase change heat storage series system.

[0055] When using a modular phase change accumulator series system for heat storage, close the heat release supply inlet 9 and heat release return outlet 12 of all accumulators in the system. Figure 6 The accumulator on the left is the first-stage accumulator in the series system, and its accumulator supply inlet is the inlet of the series system. The hot fluid flows into the accumulator from the accumulator supply inlet 14, undergoes the heat storage process shown in Figure 4, and then flows out through the accumulator return outlet 1, entering the accumulator supply inlet of the next stage accumulator. During heat release, the accumulator supply inlets 14 and accumulator return outlets 1 of all accumulators in the system are closed to... Figure 6 The right-hand accumulator is the first-stage accumulator in a series system, and its heat storage liquid inlet is the inlet of the series system. Cold fluid flows into the accumulator from the heat release liquid inlet 9, and performs the aforementioned processes. Figure 5 The heat is released during the process, and then flows out through the heat release return liquid outlet 12, entering the heat release supply liquid inlet of the next stage heat accumulator. The number of heat exchangers in the system is not limited. Figure 6 As shown, two or more units can form a series system.

[0056] The advantage of this series system is that it can store energy in stages according to the temperature range of the phase change material and the heat transfer fluid, which facilitates the cascade utilization of heat storage and release processes. For example, industrial waste steam at 130°C enters the first-stage phase change accumulator, and after heat storage, it becomes 80°C hot water and enters the second-stage accumulator. After heat storage, it becomes 50°C hot water and enters the third-stage accumulator to complete the heat storage. During heat release, the first-stage accumulator has the highest temperature and can generate 110°C steam for industrial drying, power generation, disinfection, etc. The second-stage accumulator can generate 70°C hot water for residential heating, and the third-stage accumulator can generate 40°C hot water for domestic bathing, etc., realizing the cascade utilization of heat storage.

[0057] Example 3

[0058] The phase change heat storage device of the present invention can be configured into a parallel system for modular operation.

[0059] like Figure 4 , Figure 5 , Figure 7 As shown, a phase change heat storage unit includes at least two sets of modular phase change heat storage units, wherein the modular phase change heat storage units are connected in parallel to form a modular phase change heat storage parallel system.

[0060] When the modular phase change heat accumulator and system is in heat storage, the heat release liquid inlet 9 and the heat release liquid outlet 12 of all the heat accumulators in the system are closed. The hot fluid is divided into three branches before entering the heat storage system, and then the branches flow into the corresponding heat accumulators from the heat storage liquid inlets 14, and the above-mentioned heat storage process is performed. After the heat storage is completed, the branches flow out from the heat storage liquid outlets 1, and then the branches are merged and used or flow into the next heat storage system. Figure 4 When the modular phase change heat accumulator and system is in heat release, the heat storage liquid inlets 14 and the heat storage liquid outlets 1 of all the heat accumulators in the system are closed. The cold fluid is divided into three branches before entering the system, and then the branches flow into the corresponding heat accumulators from the heat release liquid inlets 9, and the above-mentioned heat release process is performed. After the heat release is completed, the branches flow out from the heat release liquid outlets 12, and then the branches are merged and used or flow into the next heat storage system. The number of heat exchangers in the system is not limited to Figure 5 When the modular phase change heat accumulator and system is in heat release, the heat storage liquid inlets 14 and the heat storage liquid outlets 1 of all the heat accumulators in the system are closed. The cold fluid is divided into three branches before entering the system, and then the branches flow into the corresponding heat accumulators from the heat release liquid inlets 9, and the above-mentioned heat release process is performed. After the heat release is completed, the branches flow out from the heat release liquid outlets 12, and then the branches are merged and used or flow into the next heat storage system. The number of heat exchangers in the system is not limited to Figure 7 The phase change heat accumulator of the present application is rectangular, with regular shape, compact structure and simple interface. When the heat storage capacity needs to be increased, the modular parallel assembly can be performed without affecting the original heat storage system, so that the rapid expansion is realized.

[0061] In the description of the present application, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "vertical", "horizontal" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of describing the present application and not for the purpose of requiring the present application to be constructed or operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the present application, "connection" should be understood broadly, for example, it can be a connection, or a detachable connection; it can be a direct connection, or an indirect connection through an intermediate component. For those skilled in the art, the specific meaning of the above terms can be understood in specific circumstances.

[0062] The above description is the preferred embodiment of the present application, and the description of the specific examples is only for better understanding the idea of the present application. For those skilled in the art, according to the principle of the present application, several improvements or equivalent replacements can also be made, which are also considered to fall within the protection scope of the present application.

Claims

1. A novel modular phase change thermal accumulator, comprising a thermal accumulator tank, a phase change material, a heat exchange pipe, the phase change material being encapsulated inside the thermal accumulator tank, the thermal accumulator tank adopting a sealed frame structure composed of tank walls, a heat storage liquid inlet and a heat release liquid outlet being arranged on the left side of the thermal accumulator tank, a heat storage liquid outlet and a heat release liquid inlet being arranged on the right side of the thermal accumulator tank, and a plurality of heat exchange pipes being arranged in the phase change material; characterized in that, The upper part of the heat accumulator tank is provided with an integrated top header tank, the lower part of the heat accumulator tank is provided with an integrated bottom header tank, the top header tank is provided with a top pre-cooling interlayer between the top header tank and the phase change material, the bottom header tank is provided with a bottom pre-heating interlayer between the bottom header tank and the phase change material, the heat accumulator liquid inlet is communicated with the bottom pre-heating interlayer, the heat accumulator liquid outlet is communicated with the bottom header tank, the heat releasing liquid inlet is communicated with the top pre-cooling interlayer, and the heat releasing liquid outlet is communicated with the top header tank. The tank wall comprises a tank front wall, a tank rear wall, a tank left wall, a tank right wall, a tank bottom plate and a tank top plate which are connected together, and the tank wall is provided with a heat insulation interlayer structure in the middle. The tank left wall and the tank right wall are both provided with an interlayer flow channel between the tank left wall, the tank right wall and the phase change material, the interlayer flow channel comprises a left interlayer flow channel and a right interlayer flow channel, the left interlayer flow channel is a space formed by the tank front wall, the tank rear wall, the tank left wall and the left wall surface of the phase change material, and the right interlayer flow channel is a space formed by the tank front wall, the tank rear wall, the tank right wall and the right wall surface of the phase change material, the right interlayer flow channel is communicated with the bottom pre-heating interlayer and the top header tank, and the left interlayer flow channel is communicated with the top pre-cooling interlayer and the bottom header tank.

2. The novel modular phase change thermal accumulator according to claim 1, characterized in that, The phase change material is separated from the bottom pre-heating interlayer by a lower heat conducting hole plate with excellent heat transfer performance, and the phase change material is separated from the top pre-cooling interlayer by a top heat conducting hole plate with excellent heat transfer performance, the phase change material is encapsulated in a space surrounded by the tank front wall, the tank rear wall, the left wall surface of the phase change material, the right wall surface of the phase change material, the lower heat conducting hole plate and the top heat conducting hole plate, the left wall surface of the phase change material and the right wall surface of the phase change material are both made of a metal plate structure with excellent heat conduction performance, the opening positions of the heat conducting hole plate correspond to the positions of the heat exchange pipes one by one, the heat exchange pipes pass through the corresponding holes, and the heat exchange pipes and the heat conducting hole plate are welded and sealed at the contact positions.

3. The novel modular phase change thermal accumulator of claim 1, wherein, The bottom pre-heating interlayer is separated from the bottom header tank and the top pre-cooling interlayer is separated from the top header tank by an adiabatic hole plate, the opening positions of the adiabatic hole plate correspond to the positions of the heat exchange pipes one by one, the heat exchange pipes are respectively communicated with the top header tank and the bottom header tank through the adiabatic hole plate, and the heat exchange pipes and the adiabatic hole plate are welded and sealed at the contact positions.

4. The novel modular phase change thermal accumulator of claim 1, wherein, The top header tank is provided with a one-way flow device between the top header tank and the tank interlayer flow channel.

5. The novel modular phase change thermal accumulator of claim 1, wherein, The bottom header tank and the top header tank are both provided with a flow equalizing hole plate which is fixedly connected with the tank front wall and the tank rear wall.

6. The novel modular phase change thermal accumulator of claim 1, wherein, The heat exchange pipes are vertically installed and arranged in the phase change material in a straight or cross arrangement, the heat exchange pipes are provided with heat exchange fins which are uniformly or non-uniformly arranged on the heat exchange pipes.

7. The novel modular phase change thermal accumulator of claim 1, wherein, The length, height and width of the heat accumulator tank are all 0.5-50 m, and the number of the heat exchange pipes is 2-500, and the diameter d of the heat exchange pipes is 1-50 mm.

8. A phase change accumulator bank, characterized by The modular phase change heat accumulator comprises at least two groups of the modular phase change heat accumulator, each group of the modular phase change heat accumulator is connected in series to form a modular phase change heat accumulator system, or each group of the modular phase change heat accumulator is connected in parallel to form a modular phase change heat accumulator system. ​

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