High-energy phase change heat accumulator

Abstract

The utility model relates to a kind of regenerators field, especially a kind of high-energy phase change regenerator, including regenerator outer box, regenerator inner box, finned heat exchange tube, heat exchange tube fixed plate.The regenerator inner box is sealed box body after installation, and its inner box is equipped with electric heater, phase change material, finned heat exchange tube fixed plate, the regenerator is equipped with electric heating installation passage, circulating backwater passage, circulating outlet water passage and temperature-sensing blind pipe, regenerator inner box is wrapped with heat preservation layer, water in multiple pipes is heat exchange medium, heat is stored using PCM, and high-efficiency heat storage and heat release can be realized.

Description

Technical Field

[0001] This utility model relates to the field of heat storage devices, and in particular to a high-energy phase change heat storage device. Background Technology

[0002] The mismatch between energy supply and demand in time and space has become a core contradiction restricting sustainable development. In the industrial sector, up to 50% of energy consumption is emitted as waste heat, with a large amount of low-grade heat energy being directly wasted. Meanwhile, renewable energy sources such as solar and wind power exhibit significant intermittency and volatility, leading to insufficient supply stability. Phase change thermal storage technology, through the absorption and release of latent heat during the phase change process of materials, achieves the spatiotemporal transfer of energy, becoming a key approach to resolving this contradiction. Compared to sensible heat storage and chemical thermal storage, phase change thermal storage has significant advantages such as high energy density, a 3-5 times increase in heat storage capacity per unit volume, near-isothermal operation, temperature stability controlled within ±5°C, and strong reaction controllability, making it show great application prospects in areas such as industrial waste heat recovery, solar energy utilization, building heating, and grid peak shaving.

[0003] The core structure of current phase change thermal accumulators typically includes a phase change material encapsulation unit, a heat exchange fluid channel, and an insulation shell. The technical principle is to transfer waste heat or heat from renewable energy sources to the phase change material (PCM) through a heat exchange fluid, causing it to undergo a solid-liquid phase change and store latent heat. When the system requires heat, a cold fluid flows through the accumulator, triggering a reverse phase change in the PCM to release heat. However, the large-scale application of this technology still faces multiple challenges, including low heat transfer efficiency, low heat storage capacity, and complex structural design, urgently requiring innovative design to overcome performance bottlenecks.

[0004] Currently, traditional shell-and-tube or double-tube accumulators generally suffer from low heat transfer rates and long heat storage / release cycles. For example, uneven melting is a frequent problem: due to natural convection, the upper PCM melts rapidly due to the thermal plume effect, while the lower PCM remains solid for a long time, forming thermal stratification and reducing the effective heat storage volume by more than 30%. There is also the problem of solidification hysteresis: during heat release, the PCM near the tube wall solidifies first, forming a solid shell layer. Its low thermal conductivity hinders further heat release from the internal liquid PCM, prolonging the system response time. Existing accumulators also have multiple limitations in mechanical structure and thermal layout. The heat transfer area of ​​the shell-and-tube structure is insufficient, severely restricting heat exchange efficiency. The use of a fixed base cannot adapt to uneven ground conditions and is inconvenient to move, and is also prone to stress deformation of the shell. In response to the aforementioned technical problems, and to overcome the shortcomings of traditional heat accumulators such as low heat transfer efficiency, uneven melting of phase change materials, delayed solidification, inconvenience in movement, and poor load-bearing capacity, there is an urgent need for a high-energy phase change heat accumulator that is easy to move, has strong pressure resistance, and high thermal energy storage capacity. Utility Model Content

[0005] The purpose of this invention is to provide a high-energy phase change heat storage device to solve the problems existing in the prior art.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: A high-energy phase change heat storage device includes a heat storage device, an outer casing, and an inner casing. The upper part of the outer casing inside the heat storage device is connected to a liquid filling channel via a PT valve channel. The sides of the outer casing are fixedly connected by an electric heating installation channel, a circulating return water channel, and a circulating outlet water channel. The space between the inner casing and the outer casing of the heat storage device is filled with an insulation layer. The inner casing of the heat storage device has a capacity of 300L. The phase change material is separated from the return water tank and the hot water supply tank by upper and lower heat exchange tube fixing plates. Finned heat exchange tubes are evenly distributed in the phase change material and a passage is formed in the water tank.

[0007] Furthermore, the heat accumulator housing, finned heat exchange tubes, heat exchange tube fixing plate, electric heating installation channel, circulating return water channel, and circulating outlet water channel are all made of 304 stainless steel.

[0008] Furthermore, the heat accumulator is equipped with four casters at the bottom to provide stability, support, and convenience for the heat accumulator.

[0009] Furthermore, the outer casing and inner casing of the heat accumulator are fixedly connected by an electric heating installation channel, a circulating water return channel, a circulating water outlet channel, a PT valve channel, and a liquid addition channel.

[0010] Furthermore, temperature probe blind tubes are designed at both the upper and lower ends of the same side of the heat accumulator to measure the temperature of the flowing medium and the phase change material.

[0011] Furthermore, the remaining space between the inner and outer casings of the heat accumulator is filled and wrapped with an insulation layer to reduce heat loss.

[0012] Furthermore, the heat accumulator contains two upper and lower heat exchange tube fixing plates and finned heat exchange tubes arranged closely within them.

[0013] Furthermore, the aforementioned finned heat exchange tubes are straight tubes and fixed on the heat exchange tube fixing plate, evenly distributed inside the heat accumulator, which facilitates more efficient heat exchange and ensures the uniformity of heat storage and release.

[0014] Furthermore, the heat exchange tube fixing plate is fixed inside the heat accumulator, separating the phase change material from the heat exchange medium and forming a hot water supply tank at the top and a return water tank at the bottom, making the 300L large-capacity inner tank a three-layer integrated closed inner tank.

[0015] Furthermore, the top of the hot water supply tank at the upper end and the bottom of the return water tank at the lower end of the aforementioned heat accumulator are designed with arcs, which is more conducive to reducing stress concentration inside the tank.

[0016] Furthermore, the aforementioned circulating return water channel is the inlet of the cold medium during circulating heat release, and the circulating outlet water channel is the supply end of the hot medium during heat release. The circulating return water channel and the circulating outlet water channel are located on the same side of the heat accumulator.

[0017] Furthermore, the aforementioned phase change materials can be filled with substances such as barium hydroxide octahydrate, sodium acetate trihydrate, aliphatic substances, and paraffins, which have heat storage properties, but are not limited to these.

[0018] Furthermore, all the pipe connections are seamless welded.

[0019] In summary, this utility model has the following beneficial effects: By employing a large-capacity, three-layer, integrated, closed inner casing, and using multiple finned heat exchange tubes evenly distributed within the inner casing as the heat transfer pathway, the phase change material within the accumulator begins storing heat almost simultaneously. This results in a phase change accumulator with high heat storage capacity and high heat transfer efficiency. The heat release process is also timely achieved through the finned heat exchange tubes, circulating outlet water channel, and circulating return water channel, solving the problems of uneven heat storage and release, difficulty in achieving full storage, low heat storage capacity, and low heat release efficiency of the phase change material. Furthermore, the upper and lower ends of the inner casing feature a rounded arc design to increase the load-bearing and pressure-resistant capacity of the casing. The outer casing is wrapped with a foamed insulation layer, and casters are installed at the bottom of the accumulator, enhancing the overall stability, pressure resistance, load-bearing capacity, and ease of use of the accumulator. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 Top view; Figure 3 for Figure 1 A schematic diagram from point A; In the diagram: 1. PT valve channel, 2. Liquid filling channel, 3. Hot water supply tank, 4. First temperature probe, 5. Second temperature probe, 6. Finned heat exchange tube, 7. Phase change material, 8. Insulation layer, 9. Thermal circuit breaker, 10. Electric heating installation channel, 11. Fuma wheel, 12. Return water tank, 13. Circulating return water channel, 14. Circulating outlet water channel, 15. Electric heater, 16. Temperature probe blind tube, 17. Regenerator outer casing, 18. Regenerator inner casing, 19. Heat exchange tube fixing plate. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings.

[0022] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to the attached figures. Figure 1 In this specification, the terms "bottom surface" and "top surface," "inner" and "outer" refer to the direction toward or away from the geometry of a specific component. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "a plurality of" means two or more, unless otherwise explicitly and specifically defined by the direction of the center.

[0023] Example 1: like Figures 1-3 As shown, a high-energy phase change heat storage device includes an outer heat storage box 17 and an inner heat storage box 18. The outer heat storage box 17 is square, and the inner heat storage box 18 is cylindrical. The two boxes are separated by an integral foam insulation layer 8. The insulation layer is filled with integral foam material, and the insulation material in each area is uniform, resulting in high insulation performance. The upper ends of the inner and outer boxes are connected by a PT valve channel 1 and a liquid filling channel 2. The two sides of the inner and outer boxes are fixedly connected by an electric heating installation channel 10, a circulating return water channel 13, and a circulating water outlet channel 14, respectively. The circulating return water channel 13 and the circulating water outlet channel 14 are located at the lower and upper ends of the same side of the heat storage device, respectively. The first temperature probe 4 and the second temperature probe 5 installed on the outer heat storage box 17 are respectively connected to two temperature probe blind tubes 16 on the inner heat storage box 17 and are installed on the same side as the electric heating installation channel 10. The bottom of the temperature probe blind tube 16 is located at the center of the inner heat storage box.

[0024] The bottom of the heat accumulator casing 19 is equipped with four strong and easy-to-move casters 11.

[0025] The inner tank 18 of the heat accumulator has a capacity of 300L and can be filled with a large amount of pre-mixed phase change heat storage material, storing a significant amount of heat. It contains two heat exchanger tube fixing plates 19, seamlessly welded together to divide the inner tank into three integrated layers: the upper layer is the hot water supply tank 3, the middle layer is the phase change material 7, and the lower layer is the return water tank 12. The two heat exchanger tube fixing plates 19 evenly fix 32 finned heat exchanger tubes 6 between the phase change material layers. Efficient and uniform heat release and storage can be achieved through interconnected channels. The finned heat exchanger tubes 6 have openings at both ends that fit into matching openings on the heat exchanger tube fixing plates 19 and are seamlessly welded to seal, completely separating the phase change material from the heat exchange medium and ensuring no impact on the phase change material's performance. The top opening of the finned heat exchanger tubes 19 communicates with the hot water supply tank 3, and the bottom opening communicates with the return water tank 12. The fins are spirally arranged circular plates.

[0026] The circulating return water channel 13 and the circulating outlet water channel 14 are connected at both ends, and their inner ends are respectively connected to the return water tank 12 and the hot water supply tank 3, allowing the heat exchange medium to circulate and communicate within the circulating channels and tanks. Finned heat exchange tubes with openings at both ends connect the return water tank and the hot water supply tank, ensuring orderly interconnection of the channels within the tanks and allowing for efficient communication of the heat transfer medium. The return water tank 12 is also externally connected to the electric heating installation channel 10, which houses the thermal circuit breaker 9 and the electric heater 15. The liquid filling channel 2 is externally connected to and penetrates the top of the hot water supply tank 3, and its bottom communicates with the middle layer of the inner tank containing the phase change material. The prepared liquid composite phase change material can be filled into this channel. A PT valve channel is also installed at the top of the hot water supply tank 3 to discharge gas from the tank and prevent excessive pressure within the tank.

[0027] In the embodiments disclosed in this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.

[0028] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A high-energy phase change heat storage device, characterized in that: The device includes a heat accumulator, an outer casing, and an inner casing. The upper part of the outer casing inside the heat accumulator is connected to the liquid filling channel via a PT valve channel. The sides of the outer casing are fixedly connected by an electric heating installation channel, a circulating return water channel, and a circulating outlet water channel. The space between the inner casing and the outer casing of the heat accumulator is filled with an insulation layer. The inner casing of the heat accumulator has a capacity of 300L. It is fixed to the heat exchange tube fixing plate at the top and bottom to separate the phase change material from the return water tank and the hot water supply tank. Finned heat exchange tubes are evenly distributed in the phase change material, and a passage is formed in the water tank.

2. The high-energy phase change heat storage device according to claim 1, characterized in that: The insulation layer is filled using an integral foaming process, with insulation material uniformly distributed in each area, resulting in high insulation performance.

3. A high-energy phase change heat storage device according to claim 1, characterized in that: The circulating return water channel and circulating outlet water channel are fixedly connected to the return water tank and the hot water supply tank, respectively. The finned heat exchange tubes have openings at both ends to connect the return water tank and the hot water supply tank, so that the channels can be interconnected in an orderly manner within the tank, and the heat transfer medium can be efficiently exchanged.

4. A high-energy phase change heat storage device according to claim 3, characterized in that: The heat exchange tube fixing plate evenly distributes the finned heat exchange tubes in the phase change material, and can achieve efficient and uniform heat release and heat storage through the connecting channels.

5. A high-energy phase change heat storage device according to claim 1, characterized in that: The heat accumulator has a capacity of 300L, and the top liquid filling channel is directly connected to the outer casing and the upper heat exchange tube fixing plate. It can be filled with a large amount of prepared phase change heat storage material and can store a large amount of heat.

6. A high-energy phase change heat storage device according to claim 5, characterized in that: The inner casing of the heat accumulator is sealed by the upper and lower heat exchange tube fixing plates, which prevents the phase change material from contacting the heat exchange medium and allows the phase change material to be used stably in a cyclic manner.

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