Block hole type composite graphite phase change heat storage and release unit and phase change heat storage heat exchanger applying same

Abstract

The utility model relates to the technical field of heat exchange of heat exchangers, in particular to a block hole type composite graphite phase change heat storage and release unit and a phase change heat storage heat exchanger applying the same. Comprising a unit body, a plurality of runners which are arranged in the unit body, completely penetrate through the unit body and are used for introducing HTF, and a storage tank which is arranged on the adjacent side of the runners and is used for introducing PCM; a plurality of edge holes which can be stacked and spliced into the flow channel are formed in two sides of the unit body; one end of the storage groove penetrates through the unit body, and the other end of the storage groove does not penetrate through the unit body; and the direction of the edge hole is the same as that of the flow channel. The block hole type corrosion-resistant composite graphite phase change heat storage unit has the advantages of being high in heat exchange efficiency, capable of being stacked for use, wide in application range, simple in structure and the like.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, and in particular to a block-hole composite graphite phase change heat storage and release unit and a phase change heat storage heat exchanger using the same. Background Technology

[0002] A heat exchanger is a device that transfers part of the heat from a hot fluid to a cold fluid. It is also called a heat exchanger. Heat exchangers play an important role in chemical, petroleum, power, food and many other industrial productions. In chemical production, heat exchangers can be used as heaters, coolers, condensers, evaporators and reboilers, etc., and are widely used.

[0003] Chinese Patent CN 215413324 U discloses a rectangular block-hole graphite heat exchanger, relating to the field of heat exchanger technology. The rectangular block-hole graphite heat exchanger includes two fixed side plates, with multiple heat exchangers arranged between them. Each heat exchanger includes a heat exchanger shell with an internal cavity containing graphite heat exchange blocks. A connecting rod is fixedly connected to one side of each graphite heat exchange block, and a sealing plate is fixedly connected to the other end of the connecting rod. A leak-proof rubber seal is fixedly connected to one side of the heat exchanger shell, and the sealing plate is compatible with the rubber seal. This invention, through the arrangement of the cavity, sealing plate, and graphite heat exchange blocks, allows for easy replacement of the graphite heat exchange blocks. Furthermore, the device has multiple heat exchange units, and the graphite heat exchange blocks in each unit can be replaced individually, reducing replacement costs.

[0004] However, the graphite heat exchange blocks in this technical solution cannot be directly stacked. The two heat exchange blocks are connected by water pipes, which makes the contact between the heat exchange blocks not tight enough, resulting in low heat transfer efficiency. In addition, the flow path and contact area of ​​the fluid in the heat exchanger shell are also limited, resulting in low heat exchange efficiency. Utility Model Content

[0005] One of the purposes of this invention is to address the shortcomings of existing technologies by providing a block-hole composite graphite phase change heat storage and release unit. By setting several flow channels for introducing HTF and a storage tank set on the adjacent side of the flow channels for introducing PCM, the heat in HTF can be completely absorbed by PCM, thereby ensuring heat exchange efficiency.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A block-hole composite graphite phase change heat storage and release unit includes: a unit body, several flow channels disposed inside the unit body and completely penetrating the unit body for introducing HTF, and a storage tank disposed adjacent to the flow channels for introducing PCM.

[0008] Preferably, the two sides of the unit body are provided with a number of edge holes that can be stacked and assembled to form the flow channel.

[0009] Preferably, one end of the storage slot extends through the unit body, while the other end does not extend through the unit body.

[0010] Preferably, the orientation of the edge holes is the same as the orientation of the flow channel.

[0011] Preferably, the edge holes, the flow channels, and the storage tanks are all evenly distributed within the unit body.

[0012] Preferably, the edge holes are respectively located on the outside of the storage tank.

[0013] Preferably, the storage tank and the flow channel are offset from each other, and their orientations are perpendicular to each other.

[0014] Preferably, the unit body is made of graphite material, and its inner and outer surfaces are coated with a dense coating.

[0015] Preferably, the shape of the unit body is adapted to the actual usage requirements.

[0016] Another objective of this invention is to address the shortcomings of existing technologies by providing a phase change heat exchanger that is formed by stacking several heat storage units, resulting in high heat exchange efficiency, simple structure, and easy assembly and disassembly.

[0017] To achieve the above objectives, this utility model provides the following technical solution:

[0018] A phase change heat storage heat exchanger includes several block-hole composite graphite phase change heat storage and release units as described above.

[0019] The beneficial effects of this utility model are as follows:

[0020] (1) By setting the storage tank and the flow channel adjacent to each other and not communicating with each other, this utility model ensures that the phase change material in the storage tank can completely absorb the heat in the hot fluid, so that the hot fluid quickly becomes a cold fluid, improving the cooling efficiency. Furthermore, the two sides of the unit body are provided with several edge holes that can be stacked and assembled into a flow channel, so that multiple heat storage units can be stacked and used to adapt to different working environments and have a wide range of applications.

[0021] (2) The present invention has a dense coating on both the inner and outer surfaces of the unit body. The dense coating can be a ceramic coating or a silicon carbide coating, or it can be made of other organic materials such as resin coatings or inorganic materials such as tantalum carbide coatings, so that graphite becomes a high-temperature resistant, corrosion resistant and impermeable material. The form of graphite plus dense coating can enable the heat storage unit to be used in harsher environments, including the corrosion of PCM, the corrosion of HTF or higher heat storage temperature ranges.

[0022] (3) By arranging the block-hole type heat storage unit in the heat storage device, this utility model can reduce the short-flow escape phenomenon of HTF, uniformly control the flow rate and direction of HTF fluid, and adjust the flow field of HTF and increase the heat exchange area by changing the stack size and flow channel opening, thereby improving the heat exchange efficiency.

[0023] In summary, this utility model has the advantages of high heat exchange efficiency, stackability, wide applicability, and simple structure. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present utility model;

[0025] Figure 2 This is a cross-sectional view of Embodiment 1 of the present utility model;

[0026] Figure 3 This is a top view of Embodiment 1 of the present utility model;

[0027] Figure 4 This is a schematic diagram of the overall structure of Embodiment 2 of this utility model. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. 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 indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] Example 1

[0031] like Figure 1-3 As shown, this embodiment provides a block-hole composite graphite phase change heat storage and release unit, including: a unit body 1, several flow channels 2 disposed inside the unit body 1 and completely penetrating the unit body 1 for introducing HTF (i.e., heat transfer fluid), and a storage tank 3 disposed on the adjacent side of the flow channels 2 for introducing PCM (i.e., phase change material: a substance that changes its physical state and can provide latent heat under constant temperature; the process of changing physical properties is called phase change process, during which the phase change material will absorb or release a large amount of latent heat), so that the heat in the HTF can be completely absorbed, thereby ensuring heat exchange efficiency.

[0032] The unit body 1 has several edge holes 11 on both sides that can be stacked and assembled to form the flow channel 2. After multiple unit bodies 1 are stacked and spliced, a new complete flow channel 2 for HTF circulation can be formed. The flow channel 2 is preferably circular. The heat storage unit can be stacked horizontally or vertically according to actual usage requirements to ensure heat exchange efficiency as much as possible.

[0033] Meanwhile, the edge holes 11 can also be made into other forms such as rectangles to adapt to different environments or different types of HTF.

[0034] In this embodiment, the orientation of the edge holes 11 is the same as that of the flow channel 2, and the number and height of the two are the same.

[0035] In this embodiment, the edge hole 11, the flow channel 2, and the storage tank 3 are all evenly distributed within the unit body 1.

[0036] In this embodiment, the edge holes 11 are respectively disposed on the outside of the storage tank 3 to prevent the two from being connected and affecting the heat exchange effect.

[0037] In this embodiment, one end of the storage slot 3 passes through the unit body 1, while the other end does not pass through the unit body 1. Specifically, several storage slots 3 are opened on the top of the unit body 1, and the storage slots 3 do not pass through the bottom, for storing PCM.

[0038] In this embodiment, the storage tank 3 and the flow channel 2 are staggered and their orientations are perpendicular to each other to ensure that they do not interfere with each other.

[0039] In this embodiment, the shape of the unit body 1 is adapted to the actual use requirements. Specifically, it can adopt a rectangular block hole structure to facilitate the stacking and cooperation of multiple unit bodies 1, thereby forming a multi-level heat storage unit and ensuring its heat storage effect.

[0040] In this embodiment, the shape of the unit body 1 can also be made into other shapes such as circles to adapt to the use of the heat storage unit in different environments.

[0041] In this embodiment, the unit body 1 is made of graphite material, and its inner and outer surfaces are coated with a dense coating. The dense coating can be a ceramic coating or a silicon carbide layer, or it can be made of other organic materials such as resin coatings, or inorganic materials such as tantalum carbide coatings, so that graphite becomes a high-temperature resistant, corrosion resistant and impermeable material. The form of graphite plus dense coating can enable the heat storage unit to be used in more severe environments, including the corrosion of PCM, the corrosion of HTF, or higher heat storage temperature ranges.

[0042] In this embodiment, the block-hole type heat storage unit is arranged inside the heat storage unit, which can reduce the short-flow escape phenomenon of HTF, uniformly control the flow rate and direction of HTF fluid, and adjust the flow field of HTF and increase the heat exchange area by changing the stack size and the opening of the flow channel 2, thereby improving the heat exchange efficiency.

[0043] Of course, the stacking of heat storage units can prevent the PCM from expanding and overflowing after being heated, and can also achieve a tight fit without damaging the coating, thereby greatly reducing the direct contact between the PCM and HTF.

[0044] In addition, the height of the heat storage unit is 50mm~500mm, the width is 50mm~500mm, the depth is 50mm~500mm, the wall thickness is 2mm~15mm, the diameter of the flow channel 2 is 8mm~50mm, the thickness of the dense coating is 10μm~100μm, and the applicable temperature range is -100℃~1500℃.

[0045] Example 2

[0046] This embodiment provides a phase change thermal storage heat exchanger, such as... Figure 4 As shown, it includes several block-hole composite graphite phase change heat storage and release units as described in Embodiment 1, and also includes a shell 4. HTF inlet 41 and HTF outlet 42 are respectively provided on both sides of the shell 4. Several block-hole composite graphite phase change heat storage and release units are stacked between HTF inlet 41 and HTF outlet 42. The stacking method makes the heat exchanger simple in structure, easy to disassemble and assemble, and can ensure heat exchange efficiency.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A block hole type composite graphite phase change heat storage and release unit, characterized by, The unit body, a plurality of flow channels arranged inside the unit body and penetrating through the unit body for passing through HTF, and a storage tank arranged adjacent to the flow channels and used for passing through PCM, and a plurality of edge holes arranged on both sides of the unit body and used for stacking and assembling the flow channels. One end of the storage tank penetrates through the unit body, and the other end does not penetrate through the unit body.

2. The block hole type composite graphite phase change heat storage and release unit according to claim 1, characterized in that, The edge holes have the same orientation as the flow channels.

3. The block hole type composite graphite phase change heat storage and release unit according to claim 1, characterized in that, The edge holes, the flow channels, and the storage tank are uniformly distributed in the unit body.

4. The block hole type composite graphite phase change heat storage and release unit according to claim 3, characterized in that, The edge holes are respectively arranged outside the storage tank.

5. The block hole type composite graphite phase change heat storage and release unit according to claim 4, characterized in that, The storage tank and the flow channels are staggered and have perpendicular orientations.

6. The block hole type composite graphite phase change heat storage and release unit according to claim 1, characterized in that, The unit body is made of graphite material, and the inner and outer surfaces thereof are coated with a dense coating.

7. The block hole type composite graphite phase change heat storage and release unit according to claim 1, characterized in that, A plurality of block-hole type composite graphite phase change heat storage and release units according to any one of claims 1-7.

8. A phase change thermal storage heat exchanger, characterized by, ​

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