CN210664078U - Heat storage device for storing heat by using sensible heat and latent heat of material - Google Patents
Heat storage device for storing heat by using sensible heat and latent heat of material Download PDFInfo
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- CN210664078U CN210664078U CN201921391746.4U CN201921391746U CN210664078U CN 210664078 U CN210664078 U CN 210664078U CN 201921391746 U CN201921391746 U CN 201921391746U CN 210664078 U CN210664078 U CN 210664078U
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Abstract
The utility model relates to a heat storage device for composite heat storage by utilizing sensible heat and latent heat of materials, which comprises a high-temperature heat storage tank, a heat storage circulating system and a heat exchange circulating system, wherein the heat storage circulating system and the heat exchange circulating system are respectively communicated with the high-temperature heat storage tank; arranging a phase-change heat accumulator in the high-temperature heat accumulation storage tank, filling a phase-change heat accumulation material in the phase-change heat accumulator, and filling a sensible heat accumulation material in the high-temperature heat accumulation storage tank outside the phase-change heat accumulator; the phase change heat accumulator is located the guide plate, the guide plate is fixed in the high temperature heat storage tank, and the guide plate includes a plurality of first guide plates and a plurality of second guide plates, and first guide plate and second guide plate subtend and crisscross the setting from top to bottom. The utility model discloses a phase change heat accumulator is with the phase change material cladding in it, utilizes the stable flow characteristic of sensible heat storage material simultaneously, and the short slab is not matched in the system circulation operation that flow characteristic's change arouses when having complemented the phase change material phase transition and taking place.
Description
Technical Field
The utility model relates to an energy storage heat-retaining technical field especially relates to an utilize heat-retaining device of material sensible heat and latent heat composite heat storage.
Background
With the continuous acceleration of the green development process in China, the utilization scale of renewable energy sources is continuously enlarged, but the renewable energy sources such as solar energy, wind energy and tidal energy have the problems of intermittency and volatility, so that a stable and efficient energy storage technology is needed to solve the problem of unbalanced supply and demand of the energy sources when the renewable energy sources are utilized; the heat storage technology is an important implementation form of the energy storage technology, and plays a vital role in the fields of photo-thermal power generation, off-peak electricity heat storage, waste heat recovery and the like. At present, in the field of large-scale high-temperature heat storage, sensible heat storage of materials is generally adopted, and widely applied molten salt high-temperature heat storage, heat conduction oil high-temperature heat storage, concrete high-temperature heat storage and the like store heat by utilizing the sensible heat of the materials so as to achieve the purpose of heat storage.
Phase change heat storage is a heat storage form which is more efficient and has higher energy storage density than sensible heat storage, and the purpose of heat storage is realized by mainly storing and releasing phase change latent heat of a material in the phase change process of the material; the latent heat of phase change of the material is dozens of times or even hundreds of times of sensible heat, so that the latent heat of phase change has larger energy storage density than sensible heat storage, and compared with a sensible heat storage system in the same scale, the phase change heat storage system has the advantages of small volume of a heat storage device, low material input cost, small energy release temperature difference change and the like; however, in the phase-change heat storage and release process, the phase and physical properties of the heat storage material are greatly changed, and it is difficult to apply a single heat storage circulation system and a single heat exchange circulation system to the heat storage and release cycle before and after the phase change, so that the design of the phase-change heat storage and release system is very difficult, and the phase-change heat storage system cannot be widely used and popularized in a large scale.
The phase change types of the material can be divided into solid-liquid phase change, solid-gas phase change, liquid-gas phase change, solid-solid phase change and liquid-liquid phase change. During the phase change of the material, the physical properties of the material change, wherein the largest influence on the heat storage system is the change of the flow characteristics and the density of the material. The change of the flow characteristics of the material directly influences the circulation operation of the system, for example, when the liquid-solid phase change of the material occurs, the original macroscopic fluidity of the material in the liquid state is reduced to zero, the circulation of the system is directly retarded, and the heat storage and release circulation is difficult to perform. The change of the density of the material can cause the material to expand or contract, which provides higher technical requirements for the heat storage tank body; in order to solve the problem, the utility model provides an utilize heat-retaining device of material sensible heat and latent heat composite heat storage.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to prior art's not enough, provide an utilize heat-retaining device of material sensible heat and latent heat composite heat storage, through the phase change heat accumulator with the phase change material cladding in it, utilize the stable flow characteristic of sensible heat storage material simultaneously, the system circulation operation that the change of flow characteristic arouses when having complemented the phase change material phase transition and taken place does not match the short slab.
The utility model is realized by the following technical proposal, provides a heat storage device which utilizes the sensible heat and the latent heat of the material to compositely store heat, and comprises a high-temperature heat storage tank, a heat storage circulating system and a heat exchange circulating system which are respectively communicated with the high-temperature heat storage tank; arranging a phase-change heat accumulator in the high-temperature heat accumulation storage tank, filling a phase-change heat accumulation material in the phase-change heat accumulator, and filling a sensible heat accumulation material in the high-temperature heat accumulation storage tank outside the phase-change heat accumulator;
the phase change heat accumulator is located the guide plate, the guide plate is fixed in the high temperature heat storage tank, and the guide plate includes a plurality of first guide plates and a plurality of second guide plates, and first guide plate and second guide plate subtend and crisscross the setting from top to bottom.
Preferably, a part of or the whole shell of the phase-change heat accumulator is of a corrugated structure. The corrugated structure can buffer the expansion caused by the high-temperature phase change of the phase change heat storage material on the one hand, and can increase the heat exchange area of the phase change heat storage body on the other hand.
Preferably, the shape of the phase change heat accumulator is any one of a near ellipsoid, a near spheroid and a near cylinder.
Preferably, each of the first guide plate and the second guide plate is provided with a phase change heat accumulator.
Preferably, one part of the side edge of the guide plate is a connecting side, the other part of the side edge of the guide plate is a non-connecting side, the connecting side of the guide plate is connected with the high-temperature heat storage tank, and the non-connecting side of the guide plate is not connected with the high-temperature heat storage tank.
Preferably, the guide plate is provided with a guide groove, and the guide groove is arranged in a direction perpendicular to the non-connection side. The guide plate is used for stably guiding the sensible heat storage material, so that the sensible heat storage material flows from the connecting side to the non-connecting side of the guide plate and then flows to the connecting side of the lower guide plate, and then flows from the connecting side of the lower guide plate to the non-connecting side of the lower guide plate, so that reciprocating flow is realized along one direction, and stable and uniform heat exchange between the phase change heat storage material and the sensible heat storage material is realized.
Preferably, the heat storage circulating system comprises heat storage circulating pipelines communicated with the upper end and the lower end of the high-temperature heat storage tank, and a heat storage circulating working medium pump and a heat source are sequentially arranged on the heat storage circulating pipelines.
Preferably, the inlet end of the heat storage circulating pipeline is connected with the lower end of the high-temperature heat storage tank, the outlet end of the heat storage circulating pipeline is connected with the upper end of the high-temperature heat storage tank, and the first flow sensor is further mounted on the heat storage circulating pipeline.
Preferably, the heat exchange circulating system comprises heat exchange circulating pipelines communicated with the upper end and the lower end of the high-temperature heat storage tank, and a heat exchange circulating working medium pump and a heat exchange device are sequentially installed on the heat exchange circulating pipelines.
Preferably, the inlet end of the heat exchange circulating pipeline is connected with the lower end of the high-temperature heat storage tank, the outlet end of the heat storage circulating pipeline is connected with the upper end of the high-temperature heat storage tank, and the second flow sensor is mounted on the heat exchange circulating pipeline.
The utility model has the advantages that:
1. the phase change material is coated in the phase change heat storage body, and the stable flow characteristic of the sensible heat storage material is utilized to complement the short plate which is not matched with the system circulation operation caused by the change of the flow characteristic when the phase change of the phase change material occurs;
2. the phase change heat accumulator adopts a corrugated expansion buffer structure, so that expansion caused by high-temperature phase change of a phase change heat storage material can be buffered, the volume expansion of the phase change heat accumulator can be expanded by more than 16%, and the heat exchange area of the phase change heat accumulator is increased by 25-35%.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic cross-sectional view of the phase change heat storage of the present invention as a near-ellipsoidal body;
FIG. 3 is a schematic cross-sectional view of the phase change heat storage of the present invention when it is a near spherical body;
FIG. 4 is a schematic cross-sectional view of the phase change heat storage of the present invention when it is a substantially cylindrical body;
fig. 5 is a schematic top view of the deflector of the present invention;
FIG. 6 is a schematic view of the structure of FIG. 5 in the direction A;
fig. 7 is a schematic view of a partial structure of the flow equalizing plate of the present invention.
Shown in the figure:
1. the high-temperature heat storage tank comprises a high-temperature heat storage tank body, 2, a phase-change heat storage body, 3, a sensible heat storage material, 4, the phase-change heat storage material, 5, a first guide plate, 6, a second guide plate, 7, a connecting side, 8, a flow equalizing plate, 9, a guide groove, 10, a measuring sensor, 11, a heat storage circulating pipeline, 12, a heat storage circulating medium pump, 13, a heat source, 14, a first flow sensor, 15, a heat exchange circulating pipeline, 16, a heat exchange circulating medium pump, 17, a heat exchange device, 18, a second flow sensor, 19 and a flow equalizing hole.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present solution is explained below by way of specific embodiments.
For better explanation the technical scheme of the utility model, this embodiment will select specific heat accumulation material, negative pressure phase transition buffering heat accumulator's shell material to explain, and the material that selects is not right the utility model discloses each material's restriction among the technical scheme.
As shown in fig. 1, the utility model comprises a high-temperature heat storage tank 1, a heat storage circulation system and a heat exchange circulation system which are respectively communicated with the high-temperature heat storage tank 1.
A phase-change heat accumulator 2 is arranged in a high-temperature heat storage tank 1, a phase-change heat storage material 4 is filled in the phase-change heat accumulator 2, and a sensible heat storage material 3 is filled in the high-temperature heat storage tank 1 outside the phase-change heat accumulator 2.
And a part of or the whole shell of the phase-change heat accumulator 2 adopts a corrugated structure, and the corrugated structure can buffer the expansion caused by the high-temperature phase change of the phase-change heat accumulation material 4 on one hand and can increase the heat exchange area of the phase-change heat accumulator 2 on the other hand.
In the present embodiment, a part of the shell of the phase-change heat accumulator 2 is in a corrugated structure, and as shown in fig. 2, 3 and 4, the shape of the phase-change heat accumulator 2 is any one of a nearly ellipsoid, a nearly sphere and a nearly cylinder, but is not limited to the above shape. In the present embodiment, the phase-change heat storage body 2 has a nearly ellipsoidal structure, and has a major axis a of 23mm to 25mm and a minor axis b of 15mm to 17 mm.
The total volume of the phase-change heat accumulator 2 accounts for 50-70% of the total volume of the whole high-temperature heat storage tank 1, and in this embodiment, the total volume of the phase-change heat accumulator 2 accounts for 60% of the total volume of the whole high-temperature heat storage tank 1.
The phase-change heat accumulator 2 is made of any one of heat-resistant metal, ceramic and organic heat-resistant resin, but is not limited to the above materials; in this embodiment, the phase change heat storage body 2 is made of a heat-resistant metal material, specifically, a stainless steel 316L material.
The phase change heat storage material 4 is an organic phase change heat storage material 4 or an inorganic phase change heat storage material 4, and the organic phase change material is any one of paraffin and higher fatty acid, but is not limited to the materials; the inorganic phase-change heat storage material 4 is any of a hydrated salt, a molten salt, a metal, or an alloy, but is not limited to the above materials. In the present embodiment, molten salt is used as the phase change heat storage material 4.
According to the expansion characteristics of the material, when the phase-change heat storage body 2 is filled with the phase-change heat storage material 4, a part of non-filled space is left, and when the phase-change heat storage body 2 is packaged, negative pressure is pumped out for exhaust treatment, so that the absolute vacuum degree is controlled to be 60-70 KPa. In the present embodiment, the non-filled space occupies 7 to 8% of the volume of the phase-change heat storage body 2, depending on the amount of expansion of the binary molten salt.
The sensible heat storage material 3 is any one of heat conduction oil, low-melting-point molten salt, silicone oil and liquid paraffin, but is not limited to the above materials. In this embodiment, the sensible heat storage material 3 is heat transfer oil.
The phase change heat accumulator 2 is located the guide plate, the guide plate is fixed in high temperature heat storage tank 1, and the guide plate includes a plurality of first guide plates 5 and a plurality of second guide plates 6, and first guide plates 5 and second guide plates 6 opposite direction and crisscross setting from top to bottom all are provided with phase change heat accumulator 2 on every first guide plate 5 and the second guide plate 6.
As shown in fig. 5, one side of the deflector is a connection side 7, and the other side is a non-connection side, the connection side 7 of the deflector is connected to the high-temperature heat storage tank 1, and the non-connection side is not connected to the high-temperature heat storage tank 1. As shown in fig. 6, the baffle is provided with a guide groove 9, and the guide groove 9 is arranged perpendicular to the direction of the non-connection side. Stabilize the water conservancy diversion to sensible heat storage material 3 through the guide plate, realize that sensible heat storage material 3 flows to the non-connection side from the connection side 7 of guide plate, then flow to the connection side 7 of lower floor's guide plate, flow to the non-connection side of lower floor's guide plate by the connection side 7 of lower floor's guide plate again, along a direction reciprocating flow like this, realize stable, the even heat transfer between phase change heat storage material 4 and sensible heat storage material 3. As shown in fig. 5 and 7, in order to further achieve stable and uniform flow guidance of the sensible heat storage material 3, a flow equalizing plate 8 perpendicular to the flow guiding grooves 9 is fixed to the non-connection side of the flow guiding plate, and flow equalizing holes 19 are provided in the flow equalizing plate 8 at positions corresponding to the flow guiding grooves 9.
In the present embodiment, the high temperature heat storage tank 1 is provided with a measuring sensor 10, and the measuring sensor 10 includes a temperature sensor, a pressure sensor and a liquid level sensor, and can be used for measuring the temperature, the pressure and the liquid level in the high temperature heat storage tank 1 according to the process requirements.
The heat storage circulating system comprises a heat storage circulating pipeline 11 communicated with the upper end and the lower end of the high-temperature heat storage tank 1, and a heat storage circulating working medium pump 12 and a heat source 13 are sequentially arranged on the heat storage circulating pipeline 11. The inlet end of the heat storage circulating pipeline 11 is connected with the lower end of the high-temperature heat storage tank 1, and the outlet end of the heat storage circulating pipeline 11 is connected with the upper end of the high-temperature heat storage tank 1. A first flow sensor 14 is also mounted on the heat storage circulation pipe 11.
The heat storage circulation flow is as follows: the heat storage circulating working medium pump 12 sends the sensible heat storage material 3 in the high-temperature heat storage tank 1 to the heat source 13 for heating, the sensible heat storage material 3 after heating flows back to the high-temperature heat storage tank 1 again, the sensible heat storage material 3 flows from the upper end to the lower end of the high-temperature heat storage tank 1 through the guide plate for guiding, in the flowing process, the phase-change heat accumulator 2 is heated, along with the continuous circulating heating of the sensible heat storage material 3, when the temperature reaches the phase-change temperature, the phase-change heat storage material 4 in the phase-change heat accumulator 2 is subjected to phase change, and when the temperature is completely changed, the heat storage process is completed. The heat source 13 is any one of off-peak electricity, biomass and solar energy, in this embodiment, the heat source 13 is solar energy, and the solar energy is any one of a high-temperature groove type solar heat collection system, a fresnel type solar heat collection system, a high-temperature tower type solar heat collection system and a high-temperature butterfly type solar heat collection system.
The heat exchange circulating system comprises a heat exchange circulating pipeline 15 communicated with the upper end and the lower end of the high-temperature heat storage tank 1, and a heat exchange circulating working medium pump 16 and a heat exchange device 17 are sequentially arranged on the heat exchange circulating pipeline 15. The inlet end of the heat exchange circulating pipeline 15 is connected with the lower end of the high-temperature heat storage tank 1, the outlet end of the heat storage circulating pipeline 11 is connected with the upper end of the high-temperature heat storage tank 1, and a second flow sensor 18 is installed on the heat exchange circulating pipeline 15.
The heat exchange circulation flow is as follows: the heat exchange cycle working medium pump 16 sends the sensible heat storage material 3 in the high-temperature heat storage tank 1 to the heat exchange device 17 for heat exchange, the sensible heat storage material 3 after the heat exchange is completed flows back to the high-temperature heat storage tank 1 again, the sensible heat storage material 3 passes through the heat exchange, the temperature is lower than the temperature of the phase-change heat storage material 4 in the phase-change heat storage body 2, the phase-change heat storage material 4 in the phase-change heat storage body 2 heats the sensible heat storage material 3, along with the continuous proceeding of the heat exchange cycle, the temperature of the phase-change heat storage material 4 in the phase-change heat storage body 2 is gradually reduced to below a phase.
The utility model has simple structure, the phase-change material is coated in the phase-change heat storage body 2, and the stable flow characteristic of the sensible heat storage material 3 is utilized to complement the short plate which is not matched with the system circulation operation caused by the change of the flow characteristic when the phase-change material phase-change occurs; the heat exchange device has the advantages that the heat exchange device can stably guide the sensible heat storage material 3 through the guide plate, and stable and uniform heat exchange between the phase change heat storage material 4 and the sensible heat storage material 3 is realized.
Of course, the above description is not limited to the above examples, and technical features of the present invention that are not described in the present application may be implemented by or using the prior art, and are not described herein again; the above embodiments and drawings are only used for illustrating the technical solutions of the present invention and are not intended to limit the present invention, and the present invention has been described in detail with reference to the preferred embodiments, and those skilled in the art should understand that changes, modifications, additions or substitutions made by those skilled in the art within the spirit of the present invention should also belong to the protection scope of the claims of the present invention.
Claims (10)
1. A heat storage device for storing heat by using the combination of sensible heat and latent heat of materials is characterized in that: comprises a high-temperature heat storage tank (1), a heat storage circulating system and a heat exchange circulating system which are respectively communicated with the high-temperature heat storage tank (1); arranging a phase-change heat accumulator (2) in the high-temperature heat accumulation storage tank (1), filling a phase-change heat accumulation material (4) in the phase-change heat accumulator (2), and filling a sensible heat accumulation material (3) in the high-temperature heat accumulation storage tank (1) outside the phase-change heat accumulator (2);
the phase change heat accumulator (2) is located on the guide plate, the guide plate is fixed in the high-temperature heat accumulation storage tank (1), the guide plate comprises a plurality of first guide plates (5) and a plurality of second guide plates (6), and the first guide plates (5) and the second guide plates (6) are opposite and are arranged in a vertically staggered mode.
2. The heat storage device for storing heat by using the combination of sensible heat and latent heat of the material as claimed in claim 1, wherein: and part or all of the shell of the phase-change heat accumulator (2) adopts a corrugated structure.
3. The heat storage device for storing heat by using the combination of sensible heat and latent heat of the material as claimed in claim 2, wherein: the shape of the phase change heat accumulator (2) is any one of a near ellipsoid, a near sphere and a near cylinder.
4. The heat storage device for storing heat by using the combination of sensible heat and latent heat of the material as claimed in claim 1, wherein: each first guide plate (5) and each second guide plate (6) are provided with a phase change heat accumulator (2).
5. The heat storage device for storing heat by using the combination of sensible heat and latent heat of the material as claimed in claim 1, wherein: one part side of the guide plate is a connecting side (7), the other part side of the guide plate is a non-connecting side, the connecting side (7) of the guide plate is connected with the high-temperature heat storage tank (1), and the non-connecting side is not connected with the high-temperature heat storage tank (1).
6. The heat storage device for storing heat by utilizing the combination of sensible heat and latent heat of the material as claimed in claim 5, wherein: the guide plate is provided with a guide groove (9), and the guide groove (9) is perpendicular to the direction of the non-connection side.
7. The heat storage device for storing heat by using the combination of sensible heat and latent heat of the material as claimed in claim 1, wherein: the heat storage circulating system comprises a heat storage circulating pipeline (11) communicated with the upper end and the lower end of the high-temperature heat storage tank (1), and a heat storage circulating working medium pump (12) and a heat source (13) are sequentially installed on the heat storage circulating pipeline (11).
8. The heat storage device for storing heat by utilizing the combination of sensible heat and latent heat of the material as claimed in claim 7, wherein: the inlet end of the heat storage circulating pipeline (11) is connected with the lower end of the high-temperature heat storage tank (1), the outlet end of the heat storage circulating pipeline (11) is connected with the upper end of the high-temperature heat storage tank (1), and the heat storage circulating pipeline (11) is further provided with a first flow sensor (14).
9. The heat storage device for storing heat by using the combination of sensible heat and latent heat of the material as claimed in claim 1, wherein: the heat exchange circulating system comprises heat exchange circulating pipelines (15) communicated with the upper end and the lower end of the high-temperature heat storage tank (1), and a heat exchange circulating working medium pump (16) and a heat exchange device (17) are sequentially installed on the heat exchange circulating pipelines (15).
10. The heat storage device for storing heat by using the combination of sensible heat and latent heat of the material as claimed in claim 9, wherein: the inlet end of the heat exchange circulating pipeline (15) is connected with the lower end of the high-temperature heat storage tank (1), the outlet end of the heat storage circulating pipeline (11) is connected with the upper end of the high-temperature heat storage tank (1), and the heat exchange circulating pipeline (15) is provided with a second flow sensor (18).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921391746.4U CN210664078U (en) | 2019-08-26 | 2019-08-26 | Heat storage device for storing heat by using sensible heat and latent heat of material |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921391746.4U CN210664078U (en) | 2019-08-26 | 2019-08-26 | Heat storage device for storing heat by using sensible heat and latent heat of material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112648874A (en) * | 2020-12-26 | 2021-04-13 | 国网甘肃省电力公司经济技术研究院 | Heat storage and release device based on cascaded phase transition tube bank |
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2019
- 2019-08-26 CN CN201921391746.4U patent/CN210664078U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112648874A (en) * | 2020-12-26 | 2021-04-13 | 国网甘肃省电力公司经济技术研究院 | Heat storage and release device based on cascaded phase transition tube bank |
| CN112648874B (en) * | 2020-12-26 | 2022-07-15 | 国网甘肃省电力公司经济技术研究院 | Heat storage and release device based on cascaded phase transition tube bank |
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