Heat storage tank with movable flexible heat insulation layer

Abstract

The utility model discloses a heat storage tank with a movable flexible heat insulation layer. The heat storage tank comprises a tank body, the flexible heat insulation layer and a balancing weight. A safety valve is arranged on the tank body; the flexible heat insulation layer is transversely arranged in the tank body, is connected with the tank body in a manner of freely sliding up and down, and is used for suspending at the junction of a cold medium and a hot medium; the balancing weight is connected with the flexible heat insulation layer and used for adjusting the apparent density of the flexible heat insulation layer. Cold media and hot media can be stored at the same time for a long time, the heat storage efficiency is high, stress damage to the tank body can be avoided, the height position of the flexible heat insulation layer can be automatically adjusted, the construction and operation and maintenance cost is low, and the device is suitable for small and medium-sized equipment.

Description

Technical Field

[0001] The present application belongs to the field of heat storage technology, and in particular relates to a heat storage tank containing a movable flexible insulation layer. Background Art

[0002] Thermal storage is a technology that uses a thermal storage medium to store excess energy in the form of heat and release it when needed. Thermal storage technology has huge application prospects and market demand in the fields of absorbing renewable energy, participating in grid peak regulation, and promoting industrial waste heat recovery.

[0003] Heat storage technology includes three forms: sensible heat storage, phase change heat storage and thermochemical heat storage. Among them, sensible heat storage technology is the most mature technology and has the widest application scenarios. Sensible heat storage uses the property of heat storage materials to absorb and release heat when the temperature changes to achieve the purpose of heat storage. Commonly used heat storage materials include water and molten salts. At present, the sensible heat storage technology used in my country's industrial applications mostly adopts a double-tank system. The double-tank system requires two independent tanks to store high-temperature and low-temperature media respectively, and the floor space and facility costs are high. Another option is to use a single-tank system to store cold and hot media in the same tank at the same time, thereby reducing the investment and operation and maintenance costs of the heat storage system. It is estimated that the overall cost of using a single-tank system can be reduced by about 30% compared to a double-tank system.

[0004] In a single tank system, due to the significant density difference between the cold medium and the hot medium, the high-temperature medium spontaneously rises to the upper part of the tank, while the low-temperature medium sinks to the lower part of the tank. There is an area with drastic temperature changes at the junction of the cold and hot media, which is called the thermocline layer. However, the thickness of the thermocline layer has a great influence on the heat storage performance of the single tank system. On the one hand, when the cold medium and the hot medium are in direct contact, due to the significant heat transfer effect, the thickness of the thermocline layer is generally larger, the temperature of the medium in the tank is more uniform, and the heat storage efficiency is lower, that is, the heat storage effect is worse. On the other hand, the convection effect of the cold and hot media is more obvious, so it is generally not used for long-term simultaneous storage of cold and hot media. On the other hand, in order to form a stable thermocline layer, the single tank body generally requires a larger height, which makes it unsuitable for small and medium-sized equipment.

[0005] In order to reduce the thickness of the thermocline layer, some technologies have been used to set an insulation layer between the cold medium and the hot medium to reduce the flow and heat transfer between the cold and hot media, thereby improving the heat storage efficiency of the single tank system. However, the deformation of the insulation layer made of rigid materials under temperature changes may cause stress damage to the tank body. When the heat storage medium is a material with a lower density such as water or oil, the insulation layer made of ceramics, steel and other materials is difficult to suspend between the cold medium and the hot medium due to its high density, and it is also impossible to use the density difference to achieve a high degree of spontaneous adjustment. In addition, the current insulation layer will also bring higher construction and operation and maintenance costs. Utility Model Content

[0006] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a heat storage tank with a movable flexible insulation layer, which can store cold medium and hot medium for a long time at the same time, has high heat storage efficiency, can avoid stress damage to the tank body, the height position of the flexible insulation layer can be adjusted spontaneously, the construction and operation and maintenance costs are low, and it is suitable for small and medium-sized equipment.

[0007] The heat storage tank with a movable flexible heat insulation layer according to an embodiment of the utility model comprises:

[0008] A tank body, wherein the tank body is provided with a safety valve;

[0009] A flexible heat-insulating layer, which is transversely arranged in the tank body and connected to the tank body so as to be freely slidable up and down, and is used to be suspended at the junction of the cold medium and the hot medium;

[0010] A counterweight block is connected to the flexible thermal insulation layer and is used to adjust the apparent density of the flexible thermal insulation layer.

[0011] The heat storage tank with a movable flexible insulation layer according to the embodiment of the utility model has the following advantages: (1) The cold and hot media are separated by the flexible insulation layer, which greatly reduces the total heat exchange intensity between the cold and hot media, reduces the thickness of the inclined temperature layer, thereby improving the heat storage efficiency, reducing heat loss, and allowing the tank body to store cold and hot media for a long time at the same time; (2) Since the flexible insulation layer reduces the thickness of the inclined temperature layer, the design of the heat storage tank body is suitable for small and medium-sized equipment; (3) The flexible insulation layer can adapt to the heat storage tank with a changed cross-section to a certain extent, and will not cause stress damage to the tank body; (4) The flexible insulation layer is affected by the density difference between the cold and hot media, and can spontaneously adjust its position as the interface between the cold and hot media changes, without introducing additional control devices, and the apparent density of the flexible insulation layer is easy to adjust through the counterweight block; (5) The structure is simple and reliable, the production cost is low, and it is easy to maintain.

[0012] In some embodiments, the flexible thermal insulation layer comprises a flexible thermal insulation film.

[0013] In some embodiments, the flexible thermal insulation film is filled with thermal insulation material or a heat storage medium with a temperature between a cold medium and a hot medium.

[0014] In some embodiments, the flexible thermal insulation layer further comprises an upper frame and a lower frame, wherein the upper frame and the lower frame are mesh frames woven with ropes or metal wires; and the flexible thermal insulation film is sandwiched between the upper frame and the lower frame.

[0015] In some embodiments, it also includes a slide rail structure, which is arranged on the inner wall of the tank body at intervals along the circumference of the tank body; the slide rail structure includes a slide rail and a sliding member, the slide rail extends along the axial direction of the tank body, and the sliding member is freely slidable on the slide rail; the flexible thermal insulation layer is connected to the sliding member.

[0016] In some embodiments, a ring body is further included, wherein the ring body is connected to the periphery of the flexible thermal insulation layer, and the ring body is connected to the sliding member.

[0017] In some embodiments, the ring body is a metal ring or a non-metal ring.

[0018] In some embodiments, a flexible sealing member is also fixed on the ring body, and the flexible sealing member fills the gap between the ring body and the tank body.

[0019] In some embodiments, the flexible sealing member is a brush or rubber.

[0020] In some embodiments, the counterweight is located below the flexible thermal insulation layer, on the upper side of the flexible thermal insulation layer, or outside the tank body.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic diagram of the structure of a heat storage tank with a movable flexible heat insulation layer according to an embodiment of the utility model;

[0024] Figure 2 It is a side view schematic diagram of a flexible thermal insulation film in an embodiment of the utility model;

[0025] Figure 3 It is a schematic top view of a flexible thermal insulation film in an embodiment of the utility model.

[0026] Reference numerals:

[0027] Tank body 1; cold medium inlet and outlet 101; hot medium inlet and outlet 102; sewage outlet 103; safety valve 104; flexible thermal insulation layer 2; flexible thermal insulation film 201; upper frame 202; lower frame 203; counterweight block 3; slide rail structure 4; slide rail 401; sliding member 402; ring body 5; flexible blocking member 6. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] Combine the following Figures 1 to 3 To describe the heat storage tank with a movable flexible insulation layer according to an embodiment of the present utility model.

[0030] like Figures 1 to 3 As shown, the design of a heat storage tank containing a movable flexible insulation layer 2 according to an embodiment of the utility model includes a tank body 1, a flexible insulation layer 2 and a counterweight block 3.

[0031] The tank body 1 is provided with a cold medium inlet and outlet 101 and a hot medium inlet and outlet 102. The tank body 1 is used to store cold medium and hot medium at the same time. The cold medium inlet and outlet 101 is used to supply cold medium to and from the tank body 1, and the hot medium inlet and outlet 102 is used to supply hot medium to and from the tank body 1. Figure 1 In the embodiment, the lower part of the tank body 1 can store cold medium, and the upper part of the tank body 1 can store hot medium. The cold medium inlet and outlet 101 is located at the lower part of the tank body 1, and the hot medium inlet and outlet 102 is located at the upper part of the tank body 1. Figure 1 The tank body 1 is also provided with a sewage outlet 103, which is located near the bottom of the tank body 1 and is used to discharge the sewage flow in the tank body 1 regularly or irregularly. The safety valve 104 is located at the top of the tank body 1 to ensure that the pressure in the tank body 1 is within a safe range to prevent excessive pressure in the tank.

[0032] In addition, the shape of the tank body 1 is not limited to Figure 1 The cylindrical shape may also be a bowl shape or other shapes, as long as the flexible insulation layer 2 can slide freely up and down relative to the tank body 1.

[0033] The flexible heat-insulating layer 2 is disposed transversely (e.g., horizontally) in the tank body 1 and is connected to the tank body 1 so as to be freely slidable up and down. The flexible heat-insulating layer 2 is used to be suspended at the junction of the cold medium and the hot medium. It is understandable that the flexible heat-insulating layer 2 is mainly made of flexible materials. Taking water as the heat storage medium as an example, the materials of the flexible heat-insulating layer 2 include but are not limited to nylon, PVC, plastic, and other waterproof materials that have long-term corrosion resistance and can withstand 100°C hot water. The heat storage medium includes but is not limited to water, heat transfer oil and other materials whose maximum temperature does not exceed the temperature limit of the flexible insulation layer 2; the flexible insulation layer 2 divides the space in the tank body 1 into a cold medium space for storing cold medium and a hot medium space for storing hot medium, and the cold medium enters and exits the cold medium space through the cold medium inlet and outlet 101, and the hot medium enters and exits the hot medium space through the hot medium inlet and outlet 102; the flexible insulation layer 2 can reduce the thickness of the inclined temperature layer, improve the heat storage efficiency of the single tank system, and allow the tank body 1 to store cold and hot media for a long time, which is suitable for small and medium-sized equipment. The flexible insulation layer 2 can also adapt to the heat storage tank with a changed cross-section of the tank body 1 to a certain extent, and will not transmit force to the tank body 1 when deformed under the temperature change of the cold and hot media, which can effectively avoid stress damage to the tank body 1 and reduce the construction and operation and maintenance costs of the heat storage tank. In addition, the flexible insulation layer 2 is affected by the density difference between the cold medium and the hot medium, and can spontaneously adjust its position with the change of the interface between the cold medium and the hot medium without introducing additional control devices.

[0034] The counterweight block 3 is connected to the flexible thermal insulation layer 2 and is used to adjust the apparent density of the flexible thermal insulation layer 2 so that the apparent density is between the average density of the cold medium and the average density of the hot medium, thereby being able to automatically adjust the height position according to the ratio of the cold and hot media, thereby ensuring that the flexible thermal insulation layer 2 is suspended at the interface between the cold medium and the hot medium.

[0035] Therefore, the design of the heat storage tank containing the movable flexible insulation layer 2 in the embodiment of the utility model has the following advantages: (1) the cold and hot media are separated by the flexible insulation layer 2, which greatly reduces the total heat exchange intensity between the cold and hot media, reduces the thickness of the inclined temperature layer, thereby improving the heat storage efficiency, reducing heat loss, and allowing the tank body 1 to store cold and hot media for a long time; (2) because the flexible insulation layer 2 reduces the thickness of the inclined temperature layer, the design of the heat storage tank body 1 is suitable for small and medium-sized equipment; (3) the flexible insulation layer 2 can adapt to the heat storage tank with a changed cross-section to a certain extent, and will not cause stress damage to the tank body 1; (4) the flexible insulation layer 2 is affected by the density difference between the cold and hot media, and can spontaneously adjust its position as the interface between the cold and hot media changes, without the introduction of additional control devices, and the apparent density of the flexible insulation layer 2 is easy to adjust through the counterweight block 3; (5) the structure is simple and reliable, the manufacturing cost is low, and it is easy to maintain.

[0036] In some embodiments, the flexible thermal insulation layer 2 includes a flexible thermal insulation film 201. The flexible thermal insulation film 201 is a flexible film or filler with certain water-proof and heat-insulating effects, and its implementation forms include but are not limited to: a whole or spliced ​​film; a whole or spliced ​​inflatable air cushion; plastic block filling. The flexible thermal insulation film 201 can significantly reduce the total heat exchange intensity between the cold and hot media, reduce the thickness of the inclined temperature layer, thereby improving the heat storage efficiency, reducing heat loss, and allowing the tank body 1 to store cold and hot media for a long time at the same time; because the flexible thermal insulation layer 2 reduces the thickness of the inclined temperature layer, the design of the heat storage tank body 1 is suitable for small and medium-sized equipment; the flexible thermal insulation layer 2 can adapt to the heat storage tank with a changed cross-section to a certain extent, and will not cause stress damage to the tank body 1.

[0037] In some embodiments, the flexible thermal insulation film 201 is filled with thermal insulation materials such as porous media, foam boards, etc., or filled with heat storage media with a temperature between the cold medium and the hot medium. In this way, the thermal insulation capacity of the flexible thermal insulation layer 2 can be effectively improved, the heat storage efficiency can be improved, the heat loss can be reduced, and to a certain extent, it can adapt to the heat storage tank with a changed cross-section, and will not cause stress damage to the tank body 1. Since the flexible thermal insulation layer 2 reduces the thickness of the inclined temperature layer, the design of the heat storage tank body 1 is suitable for small and medium-sized equipment.

[0038] In some embodiments, the flexible thermal insulation layer 2 further includes an upper skeleton 202 and a lower skeleton 203, and the upper skeleton 202 and the lower skeleton 203 are mesh skeletons woven with ropes or metal wires such as steel wires; the flexible thermal insulation film 201 is sandwiched between the upper skeleton 202 and the lower skeleton 203, and can be fixed to the upper and lower mesh structures by weaving or other means, and the upper skeleton 202 and the lower skeleton 203 play the role of supporting the middle flexible thermal insulation film 201. In other words, the flexible thermal insulation layer 2 adopts a sandwich structure design, which realizes the flexible design of the middle flexible thermal insulation film 201 and the rigid connection of the upper and lower mesh skeletons (i.e., the upper skeleton 202 and the lower skeleton 203), thereby overcoming the problem of deformation of the flexible interface.

[0039] It should be noted that the flexible insulation layer 2 is not limited to the above-mentioned three-layer structure of upper, middle and lower layers, and other layers can be added as needed; it can also only include the middle flexible insulation film 201; the shape of the mesh skeleton includes but is not limited to grid shape, radial shape or honeycomb shape, and can also be other shapes.

[0040] In some embodiments, it also includes a slide rail structure 4, which is arranged on the inner wall of the tank body 1 at intervals along the circumference of the tank body 1. The number of slide rail structures 4 can be 4 to 100 rows, and the specific number depends on the size of the tank body 1. The material of the slide rail structure 4 is required to have the ability to resist long-term corrosion and the property of not undergoing obvious deformation when the temperature is within the temperature range of the heat storage medium. The slide rail structure 4 includes a slide rail 401 and a sliding member 402. The slide rail 401 extends along the axial direction of the tank body 1, and the sliding member 402 can be freely slidably arranged on the slide rail 401; the flexible thermal insulation layer 2 is connected to the sliding member 402. In this way, the flexible thermal insulation layer 2 can move freely up and down, providing conditions for adjusting the upper and lower positions of the flexible thermal insulation layer 2.

[0041] In some embodiments, the sliding member 402 includes but is not limited to a slider, a pulley, a sliding ball, or any other device that can slide up and down in the slide rail 401 .

[0042] In some embodiments, the sliding member 402 can be replaced by a lifting structure composed of a steel cable, a steel cable, a chain and a pulley assembly, or a mechanically controlled lifting structure.

[0043] In some embodiments, a ring body 5 is further included, and the ring body 5 is connected to the periphery of the flexible thermal insulation layer 2, and the ring body 5 is connected to the sliding member 402. For example, if the flexible thermal insulation layer 2 is only the flexible thermal insulation film 201, the periphery of the flexible thermal insulation film 201 is connected to the ring body 5; if the flexible thermal insulation layer 2 has an upper skeleton 202, a lower skeleton 203 and a flexible thermal insulation film 201, the peripheries of the three-layer structure of the upper skeleton, the lower skeleton 203 and the flexible thermal insulation film 201 are all fixed on the ring body 5. By providing the ring body 5, the four sides of the flexible thermal insulation layer 2 can be better fixed, and it is convenient to connect with the sliding member 402.

[0044] In some embodiments, the ring body 5 is a metal ring or a non-metal ring. The metal ring may be a steel ring or an aluminum alloy ring, etc., and the non-metal ring may be a ring body 5 made of a flexible material. The material of the ring body 5 should have the ability to resist long-term corrosion and the property of not undergoing obvious deformation when the temperature is within the temperature range of the heat storage medium.

[0045] If the cross-sectional radius of the tank body 1 changes, such as a bowl shape, the ring body 5 can be eliminated, and the flexible heat insulation layer 2 can be directly connected to the sliding member 402 through a lock; or a ring body 5 made of a flexible material such as nylon cloth with the same fixing function can be used;

[0046] In some embodiments, a flexible sealing member 6 is also fixed on the ring body 5, and the flexible sealing member 6 fills the gap between the ring body 5 and the tank body 1 to reduce convection between the cold medium and the hot medium without damaging the tank body.

[0047] In some embodiments, the flexible sealing member 6 is a brush or rubber, which can reduce the convection between the cold medium and the hot medium without damaging the tank body.

[0048] In some embodiments, there are two flexible sealing members 6, which are annular and distributed up and down on the outside of the ring body, which can effectively reduce the convection between the cold medium and the hot medium without damaging the tank body.

[0049] In some embodiments, the material of the counterweight 3 should be resistant to long-term corrosion, and the counterweight 3 is located below the flexible thermal insulation layer 2, such as suspended on the flexible thermal insulation layer 2, or located on the upper side of the flexible thermal insulation layer 2, such as fixed on the upper side of the flexible thermal insulation layer 2, or located outside the tank 1, connected to the flexible thermal insulation layer 2 through cables and pulleys. The counterweight 3 can be one or more pieces.

[0050] In some embodiments, the apparent density satisfies the following formula:

[0051] ρ h < b < c (1);

[0052] In formula (1), ρ h is the average density of the heat medium, ρ c is the average density of the cold medium, ρ b is the apparent density, ρ b The calculation method is:

[0053]

[0054] In formula (2), m i 、v i It is the mass and volume of the flexible heat-insulating layer 2 , the related components fixedly connected to the flexible heat-insulating layer 2 (such as the ring body 5 , the sealing member 6 and the sliding member 402 ), and the counterweight 3 .

[0055] Taking water as a heat storage medium as an example, the density of water at 30°C is approximately c =995.7kg / m 3 , the density is about ρ at 80℃ h =971.8kg / m 3 , then the value range of the overall density of the flexible thermal insulation layer 2 after weight adjustment is 971.8<ρ b <995.7kg / m 3 The recommended value is ρ b =(ρ c +ρ h ) / 2.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0057] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A heat storage tank with a movable flexible insulation layer, characterized in that: include: A tank body, wherein the tank body is provided with a safety valve; A flexible heat-insulating layer, which is transversely arranged in the tank body and connected to the tank body so as to be freely slidable up and down, and is used to be suspended at the junction of the cold medium and the hot medium; A counterweight block is connected to the flexible thermal insulation layer.

2. The heat storage tank with a movable flexible insulation layer according to claim 1, characterized in that: The flexible thermal insulation layer comprises a flexible thermal insulation film.

3. The heat storage tank with a movable flexible insulation layer according to claim 2, characterized in that: The flexible thermal insulation film is filled with thermal insulation material or a heat storage medium with a temperature between a cold medium and a hot medium.

4. The heat storage tank with a movable flexible insulation layer according to claim 2 or 3, characterized in that: The flexible heat-insulating layer further comprises an upper frame and a lower frame, wherein the upper frame and the lower frame are mesh frames woven from ropes or metal wires; the flexible heat-insulating film is sandwiched between the upper frame and the lower frame.

5. The heat storage tank with a movable flexible insulation layer according to claim 1, characterized in that: It also includes a slide rail structure, which is arranged on the inner wall of the tank body at intervals along the circumference of the tank body; the slide rail structure includes a slide rail and a sliding member, the slide rail extends along the axial direction of the tank body, and the sliding member can be freely slidably arranged on the slide rail; the flexible insulation layer is connected to the sliding member.

6. The heat storage tank with a movable flexible insulation layer according to claim 5, characterized in that: The utility model also comprises a ring body, wherein the ring body is connected to the periphery of the flexible heat insulating layer, and the ring body is connected to the sliding member.

7. The heat storage tank with a movable flexible insulation layer according to claim 6, characterized in that: The ring body is a metal ring or a non-metal ring.

8. The heat storage tank with a movable flexible insulation layer according to claim 7, characterized in that: A flexible sealing member is also fixed on the ring body, and the flexible sealing member fills the gap between the ring body and the tank body.

9. The heat storage tank with a movable flexible insulation layer according to claim 8, characterized in that: The flexible sealing member is a brush or rubber.

10. The heat storage tank with a movable flexible insulation layer according to claim 1, characterized in that: The counterweight block is located below the flexible thermal insulation layer, on the upper side of the flexible thermal insulation layer, or outside the tank body.

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