A multi-stage phase change ball heat storage device

Abstract

The present invention discloses a multi-stage phase change ball heat storage device, which includes a tank body, a top cover, a heat exchange fluid pipeline, a phase change ball, a layered partition, and a partition partition; the top cover is installed on the top of the tank body, the layered partition is arranged in the tank body, and the phase change ball is placed on the layered partition; the partition partition is installed on each layered partition to partition the layered partition; different partitions are placed with phase change balls of different melting points, and the melting points of the phase change balls of adjacent partitions are arranged in a clockwise or counterclockwise order; the space between the phase change balls in the tank body is filled with heat transfer fluid; the heat exchange fluid pipeline runs through the entire tank body, passes through each layer and partition, and when the heat exchange fluid pipeline runs through the phase change balls, it passes through the phase change balls of different partitions in order according to the melting point. Compared with a phase change heat storage unit with a single melting point, the heat storage and heat release rate and efficiency of the multi-stage phase change heat storage device of the present invention are significantly improved, and the heat transfer and thermodynamic performance are more superior.

Description

Technical Field

[0001] The invention relates to the technical field of phase change heat storage, and in particular to a multi-stage phase change ball heat storage device. Background Art

[0002] Phase change thermal storage technology uses phase change materials to absorb or release heat during phase change to achieve the purpose of heat storage and heat release. It can store temporarily unused preheated or excess heat in phase change materials, and release it through certain methods when needed. Phase change thermal storage technology uses latent heat to store energy, and the heat storage density is higher than that of sensible heat storage. During the phase change thermal storage process, the phase change material is approximately constant temperature, and the temperature of the phase change material can be well controlled. Phase change thermal storage technology has the advantages of simple device, small size, easy use and controllable device temperature.

[0003] However, the thermal conductivity of most phase change materials is relatively low, which affects the rate and efficiency of heat storage and heat release. Usually other methods are needed to enhance heat exchange. Multi-stage phase change thermal storage technology connects multiple phase change materials with different melting points in series and arranges them reasonably according to the melting points. It is an effective phase change thermal storage method. Compared with a single melting point phase change thermal storage unit, the heat storage and heat release rate and efficiency of multi-stage phase change thermal storage technology are significantly improved, and the heat transfer and thermodynamic properties are more superior. Existing thermal storage modules are all single-stage, and the multi-stage enhanced thermal storage process inside the thermal storage box is not considered. Summary of the invention

[0004] In order to solve the technical problems that the heat storage and heat release rate and efficiency of single-stage phase change thermal storage technology are low, and the existing phase change thermal storage modules do not consider improving the heat storage and heat transfer performance inside the module, the present invention provides a multi-stage phase change ball thermal storage device, which has significantly improved heat storage and heat release rate and efficiency.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A multi-stage phase-change ball heat storage device, comprising a tank body, a top cover, a heat exchange fluid pipeline, a phase-change ball, a layered partition, a partition partition, and a heat transfer fluid;

[0007] The top cover is installed on the top of the tank body, the layered partition is arranged in the tank body, and the phase change ball is placed on the layered partition; the partition partition is installed on each of the layered partitions to partition the layered partition; different partitions are filled with phase change balls with different melting points, and the melting points of the phase change balls in adjacent partitions are arranged in a clockwise or counterclockwise order; the space between the phase change balls in the tank body is filled with heat transfer fluid;

[0008] The heat exchange fluid pipeline runs through the entire tank body, passes through each layer and partition, and when the heat exchange fluid pipeline runs between the phase change balls, it passes through the phase change balls in different partitions in sequence according to the melting point.

[0009] Furthermore, the phase change ball comprises a spherical shell of the phase change ball and a packaging top cover, the spherical shell of the phase change ball is used to fill the phase change material, and the packaging top cover is detachably mounted on the spherical shell of the phase change ball.

[0010] Furthermore, the layered separator is a mesh stainless steel wire structure, and the mesh aperture is smaller than the diameter of the phase change ball.

[0011] Furthermore, the partition plates are arranged in a cross shape, dividing each layer of the layered partition plates into four areas, and the phase change balls are sorted according to their melting points and placed in different areas in a clockwise or counterclockwise direction.

[0012] Furthermore, a handle is provided on the top cover to facilitate the movement of the entire multi-stage phase change ball heat storage device.

[0013] Furthermore, the heat exchange fluid pipeline includes a fluid inlet and a fluid outlet, and the fluid inlet and the fluid outlet are both located on the top cover.

[0014] The beneficial effects of the present invention are as follows:

[0015] (1) The multi-stage phase change thermal storage device of the present invention connects a plurality of phase change balls with different melting points in series and arranges them rationally according to the melting points, and fills the gaps between the phase change balls with a heat transfer fluid. Compared with a phase change thermal storage unit with a single melting point, the heat storage and heat release rate and efficiency of the multi-stage phase change thermal storage device are significantly improved, and the heat transfer and thermodynamic performance are more superior.

[0016] (2) The multi-stage phase change heat storage device stores temporarily unused heat in the phase change material of the phase change ball and releases it by a certain method when it is needed, thereby achieving the purpose of heat energy storage and recycling.

[0017] (3) The multi-stage phase change heat storage device has a simple structure, high heat exchange efficiency, safety and stability, and is portable after the tank is packaged, thus achieving the purpose of effective utilization of heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a cross-sectional view of a multi-stage phase change ball thermal storage device.

[0019] Figure 2 It is a three-dimensional schematic diagram of a multi-stage phase change ball heat storage device.

[0020] Figure 3 Schematic diagram of the phase change sphere.

[0021] Figure 4 It is a top view of the phase change ball partition.

[0022] In the figure, the tank body 1, the top cover 2, the heat exchange fluid pipeline 3, the phase change ball 4, the layered partition 5, the partition partition 6, the heat transfer fluid 7, the handle 201, the fluid inlet 301, the fluid outlet 302, the phase change ball spherical shell 401, and the packaging top cover 402. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below based on the accompanying drawings and preferred embodiments, and the purpose and effects of the present invention will become more clear. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] like Figures 1 to 4 As shown, the multi-stage phase change ball heat storage device of the present invention includes a tank body 1, a top cover 2, a heat exchange fluid pipeline 3, a phase change ball 4, a layered partition 5, a partition partition 6, and a heat transfer fluid 7.

[0025] The top cover 2 is installed on the top of the tank body 1 to seal the heat storage device to prevent the phase change ball 4 and the heat transfer fluid 7 from leaking during the movement of the heat storage device. A handle 201 is provided on the top cover 2 to facilitate the movement of the entire multi-stage phase change ball heat storage device to achieve the purpose of releasing the stored heat where needed.

[0026] The tank body 1 is used to place multi-stage phase change balls and allow the heat exchange fluid to flow inside the tank body. The layered partition 5 is arranged in the tank body 1, and the phase change ball 4 is placed on the layered partition 5; the layered partition 5 is used to arrange the phase change balls in layers, which is convenient for the arrangement and fixation of the phase change balls. As an embodiment, the layered partition 5 is a mesh stainless steel wire structure, and the mesh aperture is smaller than the phase change ball diameter. The openings on the partition are used to allow the heat exchange fluid to pass through the inside of the tank body in sequence. The partition partition 6 is installed on each layered partition 5 to partition the layered partition 5. As one embodiment, the partition partition 6 can be a welded "cross" arranged stainless steel plate. Phase change balls with different melting points are placed in different partitions, and the melting points of the phase change balls in adjacent partitions are arranged in a clockwise or counterclockwise order. The phase change balls in the tank body 1 are filled with heat transfer fluid 7, such as molten salt, paraffin, crystallized hydrated salt and other phase change materials, which are used to fill the pores between the multi-stage phase change balls to achieve the effects of heat conduction and phase change heat transfer, so that the heat can be further utilized.

[0027] The phase change ball 4 is used to absorb or release heat from the heat exchange fluid to achieve heat storage and heat release processes. It includes a phase change ball spherical shell 401 and a packaging top cover 402. The phase change material is filled in the phase change ball spherical shell 401, but not completely filled to ensure that the phase change material can expand and contract inside the sphere, and then the packaging top cover 402 is welded on the top of the phase change ball spherical shell 401.

[0028] The heat exchange fluid pipeline 3 runs through the entire tank body 1, passing through each layer and partition, and when the heat exchange fluid pipeline 3 runs through the phase change balls, it passes through the phase change balls 4 of different partitions in sequence according to the melting point. The heat exchange fluid pipeline 3 includes a fluid inlet 301 and a fluid outlet 302, and the fluid inlet 301 and the fluid outlet 302 are both located on the top cover 2. The fluid inlet 301 is used to introduce the heat exchange fluid into the heat storage device, and the heat exchange fluid flows in the pipeline and flows out at the fluid outlet 302. The fluid inlet 301 and the fluid outlet 302 can be interchanged. When the heat of the heat exchange fluid needs to be stored, the heat exchange fluid passes through the partitions where the phase change balls with melting points from high to low in sequence; when the stored heat needs to be released to the heat exchange fluid, the heat exchange fluid passes through the partitions where the phase change balls with melting points from low to high in sequence.

[0029] The preparation process of the multi-stage phase change ball heat storage device of the present invention is as follows:

[0030] Place the first layer of layered partition 5 at the bottom of the tank body 1, place the heat exchange fluid pipeline 3 inside the tank body 1, the bottom of the heat exchange fluid pipeline 3 is separated from the bottom of the tank body 1 by a certain distance, weld the partition partition 6 on the first layer of layered partition 5, place the phase change balls with different melting points in four partitions in order of melting points, fill the tank body 1 with heat transfer fluid 7, and the height of the heat transfer fluid is consistent with the height of the bottom layer of phase change balls; place the second phase change ball partition 5 inside the heat storage device, and similarly place the four types of phase change balls 4 in partitions and fill the heat storage device with heat transfer fluid 7. By analogy, fill the tank body with multi-stage phase change balls 4 and heat transfer fluid 7. Finally, weld and seal the top cover 2 on the tank body 1.

[0031] The multi-stage phase change ball heat storage device of the present invention can be used in a variety of occasions. For example, the high-temperature flue gas at the tail of the power plant is passed into the multi-stage phase change ball heat storage device, and the heat energy in the flue gas is used to convert the box change material and the heat transfer fluid from solid to liquid. This is the absorption process of the heat energy in the flue gas. The multi-stage phase change ball heat storage device is transferred to preheat the cold air. When the air flows through the multi-stage phase change ball heat storage device, the phase change material and the heat transfer fluid in the phase change ball solidify from liquid to solid, and release a large amount of heat, and the cold air is preheated to hot air. The multi-stage phase change ball heat storage device can not only pass in gas, but also liquid, to achieve the function of heat exchange for multiple fluids. Therefore, the multi-stage phase change ball heat storage device realizes the storage and recycling of thermal energy in the flue gas, the rate and efficiency of heat storage and heat release are significantly improved, and the heat transfer and thermodynamic properties are more superior.

[0032] Those skilled in the art can understand that the above are only preferred examples of the invention and are not intended to limit the invention. Although the invention is described in detail with reference to the above examples, those skilled in the art can still modify the technical solutions recorded in the above examples or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, etc. made within the spirit and principle of the invention shall be included in the protection scope of the invention.

Claims

1. A multi-stage phase change ball heat storage device, characterized in that: The device comprises a tank body (1), a top cover (2), a heat exchange fluid pipeline (3), a phase change ball (4), a layered partition (5), a partitioned partition (6), and a heat transfer fluid (7); The top cover (2) is installed on the top of the tank body (1); the layered partition (5) is arranged in the tank body (1); the phase change ball (4) is placed on the layered partition (5); the partitioning partition (6) is installed on each layered partition (5) and is used to partition the layered partition (5); phase change balls with different melting points are placed in different partitions, and the melting points of the phase change balls in adjacent partitions are arranged in a clockwise or counterclockwise order; the space between the phase change balls in the tank body (1) is filled with a heat transfer fluid (7); The heat exchange fluid pipeline (3) runs through the entire tank body (1), passing through each layer and partition, and when the heat exchange fluid pipeline (3) runs between the phase change balls, it passes through the phase change balls (4) of different partitions in sequence according to the melting point.

2. The multi-stage phase change ball heat storage device according to claim 1, characterized in that: The phase change ball (4) comprises a phase change ball spherical shell (401) and a packaging top cover (402); the phase change ball spherical shell (401) is used to fill the phase change material; and the packaging top cover (402) is detachably mounted on the phase change ball spherical shell (401).

3. The multi-stage phase change ball heat storage device according to claim 1, characterized in that: The layered separator (5) is a mesh stainless steel wire structure, and the mesh hole diameter is smaller than the phase change ball diameter.

4. The multi-stage phase change ball heat storage device according to claim 1, characterized in that: The partition plates (6) are arranged in a cross shape, dividing each layer of the layered partition plates (5) into four regions, and the phase change balls are sorted according to their melting points and placed in different regions in a clockwise or counterclockwise order.

5. The multi-stage phase change ball heat storage device according to claim 1, characterized in that: The top cover (2) is provided with a handle (201) to facilitate the movement of the entire multi-stage phase change ball heat storage device.

6. The multi-stage phase change ball heat storage device according to claim 1, characterized in that: The heat exchange fluid pipeline (3) comprises a fluid inlet (301) and a fluid outlet (302), and the fluid inlet (301) and the fluid outlet (302) are both located on the top cover (2).

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