A device for delaying phase separation of inorganic salt phase change material

Abstract

The application discloses a device for delaying phase separation of inorganic salt phase change material, which comprises an energy storage tank, a water inlet pipe arranged on the upper part of the side wall of the energy storage tank, and a water outlet pipe arranged on the lower part of the side wall of the energy storage tank; an energy storage runner rotatably arranged in the energy storage tank and embedded with an energy storage plate; and a power runner rotatably arranged in the energy storage tank and located above the energy storage runner, the power runner being engaged with the energy storage runner and used for driving the energy storage runner to rotate. The power runner is arranged to provide power for the energy storage runner, so as to drive the energy storage runner to rotate, and physical disturbance is generated on the inorganic salt phase change material in the energy storage plate through the rotation of the energy storage runner, so as to delay the phase separation phenomenon of the inorganic salt phase change material, and the material in the plate is also in a flowing state, a convection heat exchange effect is generated, and the heat exchange efficiency is further improved.

Description

Technical Field

[0001] This invention relates to the field of phase change energy storage technology, and in particular to a device for delaying phase separation of inorganic salt phase change materials. Background Technology

[0002] In recent years, with the requirements of low-carbon development and the rapid increase in energy demand, the scale of renewable energy development and construction has gradually expanded, and the technology has become increasingly mature. However, problems such as low energy utilization and high cost still exist. Therefore, developing energy storage technology can improve energy utilization while achieving economic benefits. From a technical principle perspective, energy storage is mainly divided into mechanical energy storage, chemical energy storage, electrochemical energy storage, electrical energy storage, and thermal energy storage. Among them, in the field of thermal energy storage, phase change energy storage technology has great application value and broad prospects in many fields such as aerospace, solar energy utilization, heating, and air conditioning due to its high energy density and relatively stable temperature and energy.

[0003] Phase change energy storage materials can be mainly divided into two categories: inorganic and organic. Compared with the high cost and low thermal conductivity of organic phase change materials, inorganic hydrated salts have lower production costs, higher thermal conductivity, and good flame retardancy, greatly improving safety in use. Currently, the biggest problem in the research and development of inorganic hydrated salt phase change materials is that phase separation gradually occurs during the phase change process, causing the material to lose its energy storage effect. The most widely used and accepted approach to this is to add a certain proportion of thickener to the phase change material formulation. This method can largely alleviate the phase separation phenomenon of hydrated salt phase change materials. The principle is to alleviate phase separation by blocking or slowing down the settling of anhydrous salt particles. However, during the storage and release process, anhydrous salt particles are always affected by gravity and fall, so phase separation will still eventually occur, greatly weakening the energy storage effect and seriously affecting the energy storage efficiency in practical applications. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, the present invention provides a device for delaying phase separation of inorganic salt phase change materials.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] An apparatus for delaying phase separation in inorganic salt phase change materials, comprising:

[0007] An energy storage tank, wherein an inlet pipe is provided on the upper part of the side wall of the energy storage tank and an outlet pipe is provided on the lower part of the side wall of the energy storage tank;

[0008] An energy storage rotor is rotatably disposed within the energy storage tank, and an energy storage plate is embedded within the energy storage rotor;

[0009] A power runner is arranged in the energy storage groove and above the energy storage runner, and is engaged with the energy storage runner to drive the energy storage runner to rotate.

[0010] Further, the gear teeth of the energy storage runner are a stainless steel frame structure, and the energy storage plate is embedded in the interior of the stainless steel frame structure.

[0011] Further, the stainless steel frame structure has a trapezoidal cross section, and two opposite positioning plates are arranged in the stainless steel frame structure; the two positioning plates correspond to the long sides of the top surface of the stainless steel frame structure, respectively.

[0012] The energy storage plate is a rectangular body, and is arranged between the two positioning plates; the long side of the energy storage plate is parallel to the long side of the positioning plate, and the wide side of the energy storage plate is parallel to the wide side of the positioning plate.

[0013] Further, the water outlet end of the water inlet pipe corresponds to the side gear tooth above the power runner, so that the water flow from the water inlet pipe can drive the power runner to rotate.

[0014] Further, the water inlet pipe is provided with a first temperature sensor, a first flow rate sensor and a first flow regulating valve, the water outlet pipe is provided with a second temperature sensor, a second flow rate sensor and a second flow regulating valve, the first flow regulating valve is electrically connected with the first temperature sensor, the first flow rate sensor, the second temperature sensor and the second flow rate sensor, respectively; the second flow regulating valve is electrically connected with the second temperature sensor and the second flow rate sensor, respectively.

[0015] Further, the side wall of the energy storage groove is provided with a first heat preservation layer, and the side wall of the water inlet pipe and the water outlet pipe is provided with a second heat preservation layer.

[0016] Further, the inner wall of the energy storage groove is provided with a liquid level switch, and the height of the liquid level switch in the energy storage groove is higher than the height of the energy storage runner in the energy storage groove.

[0017] Further, the diameter of the power runner is smaller than the diameter of the energy storage runner.

[0018] Further, an auxiliary power member is arranged in the energy storage groove, and is in transmission connection with the power runner to drive the power runner to rotate.

[0019] Further, the rotating speed of the energy storage runner is wherein t is the time for the agglomerated solid in the energy storage plate to sink along the wide side of the energy storage plate during the freeze-thaw cycle, in seconds.

[0020] Compared with the prior art, the application has the following beneficial effects:

[0021] The device for delaying phase separation of inorganic salt phase change material disclosed by the application sets the power runner and the energy storage runner in the energy storage groove, the power runner provides power for the energy storage runner, thereby driving the energy storage runner to rotate, physical disturbance is generated to the inorganic salt phase change material in the energy storage plate through the rotation of the energy storage runner, the sinking of the anhydrous salt under gravity is prevented, thereby the hydration salt phase separation phenomenon can be delayed in the energy storage process, the energy storage effect of the phase change material is further improved, and the service life of the phase change material is prolonged; and the phase change material inside the energy storage plate is also in a flowing state, convection heat exchange is generated inside, the temperature field is more uniform, and the heat exchange efficiency is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the overall structure schematic diagram of the application;

[0023] Figure 2 is the main view of the gear structure of the energy storage runner of the application;

[0024] Figure 3 is the top view of the gear structure of the energy storage runner of the application;

[0025] Figure 4 is the structure schematic diagram of the energy storage plate of the application.

[0026] The figure mark: 1-power runner, 2-energy storage runner, 3-gear, 4-water inlet pipe, 5-water outlet pipe, 6-energy storage groove, 7-first heat preservation layer, 8-second heat preservation layer, 9-first flow regulating valve, 10-liquid level switch, 11-first temperature sensor, 12-first flow rate sensor, 13-second temperature sensor, 14-second flow rate sensor, 15-second flow regulating valve, 16-stainless steel frame structure, 17-positioning plate, 18-energy storage plate. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the application more clear and obvious, the application is further described in detail below in combination with examples and drawings, the illustrative embodiment of the application and the description thereof are only used to explain the application, and do not limit the application.

[0028] The inventors discovered in the prior art that in existing energy storage water distribution systems, the energy storage plates are statically stacked relative to the water flow. On the one hand, this cannot prevent the phase separation phenomenon of the phase change material. On the other hand, as the water flows over the surface of the energy storage plate, the temperature is gradually conducted from the surface of the energy storage plate inward, resulting in low heat exchange efficiency. Furthermore, during the energy storage process, the phase separation of inorganic salt phase change materials (low temperature) becomes more and more serious with the increase of the number of thawing and freezing cycles, which leads to a reduction in the energy storage capacity of the phase change material or even the loss of energy storage effect, seriously affecting the service life and use value of inorganic salt phase change materials.

[0029] Example

[0030] like Figures 1-4 An apparatus for delaying phase separation in inorganic salt phase change materials, as shown, includes:

[0031] Energy storage tank 6, with an inlet pipe 4 on the upper part of the side wall and an outlet pipe 5 on the lower part of the side wall;

[0032] Energy storage rotor 2 is rotatably disposed in energy storage tank 6, and energy storage plate 18 is embedded in energy storage rotor 2;

[0033] The power wheel 1 is rotatably disposed in the energy storage tank 6 and located above the energy storage wheel 2. The power wheel 1 and the energy storage wheel 2 mesh with each other and are used to drive the energy storage wheel 2 to rotate.

[0034] The aforementioned energy storage tank 6 achieves the flow of low-temperature water through the inlet pipe 4 and outlet pipe 5, thereby realizing heat exchange and energy storage of the energy storage plate 18. An energy storage rotor 2 is installed to rotate within the energy storage tank 6, driving the energy storage plate 18 inside to rotate, thus causing the inorganic salt phase change material within the energy storage plate 18 to flow, thereby achieving its purpose of delaying phase separation. A power rotor 1 is installed to mesh with the energy storage rotor 2 to drive the energy storage rotor 2 to rotate.

[0035] In one embodiment of this application, the outlet end of the water inlet pipe 4 corresponds to the area above the tooth 3 on one side of the power rotor 1, so that the water flowing out of the water inlet pipe 4 can drive the power rotor 1 to rotate. That is, the low-temperature water flow from the water inlet pipe 4 provides power to the power rotor 1, thereby driving the energy storage rotor 2 to rotate. By using a water circulation system to maintain the continuous rotation of the power rotor 1 and the energy storage rotor 2, energy can be saved.

[0036] As an example, the inlet pipe 4 is provided with a first temperature sensor 11, a first flow rate sensor 12 and a first flow regulating valve 9, the outlet pipe 5 is provided with a second temperature sensor 13, a second flow rate sensor 14 and a second flow regulating valve 15, the first flow regulating valve 9 is electrically connected with the first temperature sensor 11, the first flow rate sensor 12, the second temperature sensor 13 and the second flow rate sensor 14 respectively, and the second flow regulating valve 15 is electrically connected with the second temperature sensor 13 and the second flow rate sensor 14 respectively.

[0037] The first temperature sensor 11 and the first flow rate sensor 12 feed the temperature data and the flow data to the first flow regulating valve 9, the first flow regulating valve 9 regulates the flow rate of the inlet pipe 4, so that the inlet pipe 4 transports the low-temperature water to the energy storage tank 6 at a suitable flow rate, in the process, the water flow with a certain flow rate impacts the power runner 1 to rotate, thereby driving the energy storage runner to rotate, at the same time, the low-temperature water flow of the outlet pipe 5 exchanges heat with the energy storage runner 2 in the rotating process, so as to be cooled and stored, in the process of cooling and storing, the low-temperature water in the energy storage tank 6 exchanges heat with the energy storage plate 18, so as to increase the temperature of the low-temperature water. The second temperature sensor 13 and the second flow rate sensor 14 feed the temperature data and the flow data to the second flow regulating valve 15, the second flow regulating valve 15 regulates the flow rate of the outlet pipe 5, and feeds back to the first flow regulating valve 9 of the inlet pipe 4 to control the flow rate, so as to keep the temperature of the water in the energy storage tank 6 stable.

[0038] As an example, in order to maximize the heat exchange between the energy storage runner 2 and the low-temperature water in the rotating process, the inner wall of the energy storage tank 6 is provided with a liquid level switch 10, the height of the liquid level switch 10 in the energy storage tank 6 is higher than the height of the energy storage runner 2 in the energy storage tank 6. The liquid level switch 10 ensures that the low-temperature water in the energy storage tank 6 can always flood the energy storage plate 18 in the energy storage runner 2, so as to make the inorganic salt phase change material in the energy storage plate 18 flow without affecting the heat exchange, thereby achieving the purpose of delaying the phase separation.

[0039] As an example, in order to minimize the energy loss in the process of cooling and storing, the side wall of the energy storage tank 6 is provided with a first heat preservation layer 7, and the side walls of the inlet pipe 4 and the outlet pipe 5 are provided with a second heat preservation layer 8.

[0040] In an embodiment of the present application, the gear teeth 3 of the energy storage runner 2 are a stainless steel frame structure 16, and the energy storage plate 18 is embedded in the inside of the stainless steel frame structure 16. By designing the gear teeth 3 of the energy storage runner 2 as a stainless steel frame structure 16, the inorganic salt phase change material can be loaded without affecting the rotation and heat transfer effect, which can not only ensure the strength requirement but also maximize the heat exchange area between the energy storage plate 18 and the low-temperature water.

[0041] As an example, the cross section of the stainless steel frame structure 16 is trapezoidal, and two positioning plates 17 are arranged in the stainless steel frame structure 16; the two positioning plates 17 correspond to the top long sides of the stainless steel frame structure 16 respectively; the energy storage plate 18 is a rectangular body, and the energy storage plate 18 is installed between the two positioning plates 17; wherein the long side of the energy storage plate 18 is parallel to the long side of the positioning plate 17, and the wide side of the energy storage plate 18 is parallel to the wide side of the positioning plate 17.

[0042] By designing the gear teeth 3 of the energy storage runner 2 as a trapezoidal body, the fatigue damage caused by the bending stress at the root of the gear during operation can be reduced, but the energy storage plate 18 is a rectangular body, in order to fix the energy storage plate 18 inside the gear teeth 3, the positioning plate 17 needs to be added in the stainless steel frame structure 16, so that the energy storage plate 18 will not shake during operation. When the energy storage plate 18 is loaded on the energy storage runner 2, the placement method is that the wide side of the energy storage plate 18 is in the diameter direction of the energy storage runner 2, and the long side is perpendicular to the diameter direction, which can maximize the problem of uneven stress during the movement of the runner and can reduce the speed of the runner to help its stable operation.

[0043] As an example, the diameter of the power runner 1 is smaller than the diameter of the energy storage runner 2, which can have the effect of saving effort.

[0044] It should be noted that the above-mentioned energy storage runner 2 can realize the loading of the energy storage plate 18 filled with inorganic salt phase change material, according to the required cold quantity and the size of the available site, under the premise of meeting the strength requirement of the energy storage runner 2, the number of gear teeth 3 and the diameter of the runner of the energy storage runner 2 can be changed.

[0045] As an example, the shell of the energy storage plate 18 is HDPE, which has the advantages of corrosion resistance, good sealing, chemical stability and high thermal conductivity, etc., which can make the inorganic phase change material have no risk of material leakage during the cold storage process.

[0046] In an embodiment of the present application, the auxiliary power member is arranged in the energy storage tank 6, and the auxiliary power member is in transmission connection with the power runner 1 and is used to drive the power runner 1 to rotate.

[0047] Specifically, the auxiliary power member can be a motor, and the power runner 1 is in transmission connection with the output shaft of the motor, and the power runner 1 is driven to rotate by the motor. The speed of the power runner 1 is designed according to the speed of the energy storage runner 2, so that the speed of the energy storage runner 2 can reach a preset value.

[0048] As an example, the speed of the energy storage runner 2 is Wherein, t is the time of the agglomerated solid in the energy storage plate 18 sinking in the width direction of the energy storage plate during the freeze-thaw cycle, unit s. The design of the rotation speed of the energy storage runner 2 should not be too large or too small. Since the energy storage plate 18 will have an agglomeration phenomenon during the freeze-thaw cycle, according to the density of the agglomerated material and the length of the energy storage plate 18, the sinking time S of the agglomerated solid is calculated, and the minimum rotation speed is

[0049] Through the coordination of the above structures, the phase separation problem of the inorganic salt phase change material can be solved, and the heat exchange efficiency of the energy storage plate 18 is improved, so that the energy storage effect can play the maximum role.

[0050] Of course, the present application can also have other various embodiments, and those skilled in the art can make various corresponding changes and modifications according to the present application without departing from the spirit and essence of the present application. However, these corresponding changes and modifications should all belong to the protection scope of the claims attached to the present application.

Claims

1. A device for retarding phase separation of an inorganic salt phase change material, characterized by, The utility model relates to a kind of energy storage device, including: Energy storage tank, the upper portion of the side wall of the energy storage tank is provided with water inlet pipe, and the lower portion of the side wall is provided with water outlet pipe; Energy storage runner, the energy storage runner is rotatably arranged in the energy storage tank, and the gear teeth of the energy storage runner are designed as stainless steel frame structure, and the energy storage runner is embedded in the stainless steel frame structure Energy storage plate, the energy storage plate is filled with inorganic salt phase change material; Power runner, the power runner is rotatably arranged in the energy storage tank and located above the energy storage runner, and the power runner is engaged with the energy storage runner and used to drive the energy storage runner to rotate; And wherein, The water inlet pipe is used to introduce low-temperature water into the energy storage tank, and the outlet end of the water inlet pipe corresponds to the upper side of the gear teeth of the power runner, the low-temperature water flow drives the power runner to rotate, and the low-temperature water exchanges heat with the inorganic salt phase change material in the energy storage plate to store energy. And the water inlet pipe is provided with a first temperature sensor, a first flow rate sensor and a first flow regulating valve, the water outlet pipe is provided with a second temperature sensor, a second flow rate sensor and a second flow regulating valve, the first flow regulating valve is electrically connected with the first temperature sensor, the first flow rate sensor, the second temperature sensor and the second flow rate sensor respectively, and the second flow regulating valve is electrically connected with the second temperature sensor and the second flow rate sensor respectively. The first flow regulating valve adjusts the flow rate of the inlet water according to the feedback temperature and flow data of the inlet water and outlet water, and the second flow regulating valve adjusts the flow rate of the outlet water according to the feedback temperature and flow data of the outlet water, so that the water temperature in the energy storage tank remains stable. And the energy storage tank is provided with a liquid level switch on the inner wall, and the height of the liquid level switch is higher than the height of the energy storage runner in the energy storage tank, so as to ensure that the low-temperature water in the energy storage tank can always flood the energy storage plate in the energy storage runner, and the rotation of the energy storage runner causes physical disturbance to the inorganic salt phase change material in the energy storage plate, prevents the sinking of the anhydrous salt under gravity, delays the phase separation of the phase change material and keeps the phase change material in a flowing state.

2. The apparatus for retarding phase separation of inorganic salt phase change material according to claim 1, wherein The cross section of the stainless steel frame structure is trapezoidal, and two opposite positioning plates are arranged therein; the two positioning plates correspond to the long sides of the top surface of the stainless steel frame structure respectively; the energy storage plate is rectangular and installed between the two positioning plates; wherein the long side of the energy storage plate is parallel to the long side of the positioning plate, and the wide side of the energy storage plate is parallel to the wide side of the positioning plate.

3. The apparatus for retarding phase separation of inorganic salt phase change material of claim 1, wherein, The side wall of the energy storage tank is provided with a first heat preservation layer, and the side wall of the water inlet pipe and the water outlet pipe is provided with a second heat preservation layer.

4. The apparatus for retarding phase separation of inorganic salt phase change material of claim 1, wherein, The diameter of the power runner is smaller than the diameter of the energy storage runner.

5. The apparatus for retarding phase separation of inorganic salt phase change material of claim 1, wherein, The energy storage tank is provided with an auxiliary power member, and the auxiliary power member is in driving connection with the power runner and used to drive the power runner to rotate.

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