A phase change thermal storage system with mechanical and high-speed airflow mixing stirring device

Abstract

The application discloses a phase change heat storage system with mechanical and high-speed airflow mixing stirring devices, which comprises a phase change heat storage device, a temperature acquisition device, a control device and a gas cylinder. The phase change heat storage device comprises a phase change material storage tank, heat exchange pipes, lead screws, motors, heating rods, front auger blades and rear auger blades and temperature sensors. The upper ends of the lead screws are connected with the motors, the lower ends of the lead screws located at the front end and the rear end of the phase change material storage tank are welded with the front auger blades and the rear auger blades respectively, the rotating directions of the blades of the front and rear auger blades are opposite, the blades are hollow, and airflow injection holes are arranged on the surfaces of the blades. The lead screws are hollow, the center of each lead screw is provided with a heating rod, and a gas channel is arranged between the heating rod and the inner wall of the lead screw. The gas channel is communicated with the interiors of the front auger blades or the rear auger blades. In the heating and heat storage process of the phase change heat storage system, the phase change materials in the upper and lower layers are stirred and mixed, the heat storage efficiency of the phase change heat storage system is improved, and the thermal stress of the phase change material storage tank is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of phase change material heat storage, and particularly relates to a phase change heat storage system with a mechanical and high-speed airflow mixing and stirring device. BACKGROUND

[0002] Renewable energy, such as solar, wind and water energy, has the ability to be naturally replenished, which can effectively reduce the impact of energy consumption on the environment and society, thereby attracting widespread attention. However, unlike fossil fuels, renewable energy needs to be collected when there is a surplus and stored when there is a shortage, which means that the use of renewable energy requires a reliable energy storage system.

[0003] The latent heat storage system uses phase change materials to store thermal energy, which can achieve heat storage and release with almost no temperature change. In addition, the latent heat storage system has greater energy storage density and better environmental sustainability than the sensible heat storage system. In practical applications, phase change materials are usually filled in phase change material storage tanks, and heat exchange tubes are arranged in the storage tanks to achieve heat storage and release.

[0004] The heat storage and release process of the phase change heat storage system mainly includes heating, heat storage and heat release processes, corresponding to the solid-liquid-solid phase change process of the phase change material. However, in practical applications, the phase change heat exchange system with horizontally arranged heat exchange tubes has a large temperature difference between the upper and lower phase change materials due to the long pipeline, which results in lower heat storage efficiency and greater heat stress of the heat storage tank.

[0005] In view of the problem that the large temperature difference between the upper and lower phase change materials in the phase change heat exchange system leads to lower heat storage efficiency and greater heat stress of the heat storage tank, the existing technology has a device that stirs the phase change material by introducing high-pressure nitrogen gas into the bottom of the heat storage tank. The nitrogen gas flow formed by the high-pressure nitrogen gas blows the solid phase change material deposited at the bottom of the heat storage tank to make it float and mix with the upper liquid, so as to solve the problem of insoluble solid deposition and improve the utilization rate and heat storage efficiency of the phase change material. There is also a stirring type phase change energy storage device and a jet compression refrigeration system using the device, which improves the dispersibility of the composite phase change material by arranging a stirrer in the heat storage tank.

[0006] The device of the above-mentioned existing technology is suitable for improving the uniformity of composite phase change materials or easily precipitated phase change materials during the heat storage process of the phase change material. However, during the heating and heat release processes, the phase change material is in a solid state, so the stirring device and the airflow injection device cannot function well, and the temperature difference between the upper and lower phase change materials is the largest during the heating and heat release processes, which will lead to lower heat storage efficiency and greater heat stress of the heat storage tank. Therefore, it is necessary to propose a new method to solve the problem of the large temperature difference between the upper and lower phase change materials during the heating and heat release processes, which leads to lower heat storage efficiency and greater heat stress of the heat storage tank. SUMMARY

[0007] In order to overcome the defects of the prior art, the application provides a phase change heat storage system with mechanical and high-speed airflow mixing and stirring devices, a plurality of stirring devices capable of sliding up and down are installed in the phase change heat exchange system and are provided with heating rods, auger blades and high-speed gas injection devices, the phase change materials in upper and lower layers are stirred and mixed during the heating and heat storage process of the phase change heat storage system, the heat storage efficiency of the phase change heat storage system is improved, and the thermal stress of the phase change material heat storage tank is reduced.

[0008] The phase change heat storage system with mechanical and high-speed airflow mixing and stirring devices comprises a phase change heat storage device, a temperature acquisition device, a control device and a gas cylinder.

[0009] The phase change heat storage device comprises a phase change material storage tank, heat exchange pipes, lead screws, motors, heating rods, front auger blades and rear auger blades, and temperature sensors.

[0010] A top cover is arranged at the top end of the phase change material storage tank, a plurality of through holes are formed in the positions of the front and rear of the phase change material storage tank, and a lead screw is inserted into each through hole; the upper ends of the lead screws are connected with the motors; the lower ends of the lead screws located in front of the phase change material storage tank are welded with the front auger blades, the lower ends of the lead screws located behind the phase change material storage tank are welded with the rear auger blades, and the rotating directions of the blades of the front auger blades and the rear auger blades are opposite; the interiors of the front auger blades and the rear auger blades are hollow structures, and airflow injection holes are formed in the blades; the interiors of the lead screws are hollow, the heating rods are arranged at the central positions of the interiors of the lead screws, the interiors of the lead screws are gas passages between the heating rods and the inner walls of the lead screws, the gas passages are in communication with the interiors of the front auger blades or the rear auger blades, high-speed airflow flows to the interiors of the front auger blades or the rear auger blades through the gas passages in the lead screws and is injected out of the airflow injection holes;

[0011] The phase change material storage tank is filled with phase change materials, the heat exchange pipes are arranged in the phase change material storage tank, and the temperature sensors are arranged on the side surface of the phase change material storage tank and inserted into the phase change material storage tank.

[0012] The temperature sensors in the phase change heat storage device transmit the temperature signals in the phase change material storage tank to the temperature acquisition device, the temperature acquisition device transmits the collected temperature signals to the control device, the gas cylinder is in communication with the lead screws through pipelines, and the control device is connected with and controls the motors and the heating rods.

[0013] Further, the guide rail and the screw rod buckle are further included; a support frame is welded on the top cover of the phase change material storage tank, and the guide rail is installed on the support frame; a pair of screw rod buckles are arranged at the connecting position of the screw rod and the through hole of the top cover, the screw rod buckles are installed on the guide rail, and the inner holes of the screw rod buckles are provided with threads corresponding to the screw rod.

[0014] Further, the heat exchange medium inlet header and the heat exchange medium outlet header are further included; the heat exchange pipes are arranged in multiple rows in parallel and uniformly, each row is arranged in an S shape in the phase change material storage tank, the inlet of the heat exchange pipe is in communication with the heat exchange medium inlet header, and the outlet of the heat exchange pipe is in communication with the heat exchange medium outlet header.

[0015] Further, the gas flow meter is further included, the gas flow meter is located between the gas cylinder and the screw rod, the gas flow meter, the gas cylinder and the screw rod are sequentially communicated through pipelines, and the control device is connected with and controls the gas flow meter.

[0016] Further, the phase change material storage tank is wrapped with thermal insulation material.

[0017] Further, a plurality of air holes are formed in the top cover of the phase change material storage tank.

[0018] Further, the temperature sensor is arranged close to the front auger blade and the rear auger blade.

[0019] The beneficial effects of the present application are as follows:

[0020] (1) The heating device is introduced into the stirrer, and the phase change material can be melted in the heating process of the phase change heat storage system, so that the semi-solid and semi-liquid state can also be stirred and mixed in the heating process of the phase change material.

[0021] (2) The screw rod sliding device is installed on the phase change material storage tank, and the auger blade can move along with the movement of the liquid level in the phase change heat storage system, thereby improving the mixing efficiency of the solid-liquid phase change material.

[0022] (3) The blade carried by the lower section of the screw rod is the auger blade, which can drive the liquid and paste phase change materials to move, and cooperate with the opposite auger blades on the left and right sides to form a vortex, thereby accelerating the melting process of the phase change material.

[0023] (4) The high-speed airflow injection hole is arranged in the stirrer blade, and the airflow channel is arranged around the heating rod; the heating rod can heat the airflow, and the high-speed and high-temperature gas sprayed out can cooperate with the screw rod sliding device to accelerate the melting of the phase change material. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 This is a schematic diagram of the phase change thermal storage system of the present invention, which includes a mechanical and high-speed airflow mixing and stirring device.

[0025] Figure 2 This is a sectional view of the main structural view of a phase change thermal energy storage device.

[0026] Figure 3 This is a cross-sectional view of the right-hand view of the phase change thermal energy storage device structure.

[0027] Figure 4 This is a schematic diagram of the structure of the front or rear auger blades.

[0028] Figure 5 This is a schematic diagram of the lead screw clamping device.

[0029] In the diagram, the components are: phase change thermal storage device 1, phase change material storage tank 1-1, heat exchange tube 1-2, heat exchange medium inlet manifold 1-3, heat exchange medium outlet manifold 1-4, guide rail 1-5, lead screw buckle 1-6, lead screw 1-7, motor 1-8, heating rod 1-9, gas channel 1-10, front auger blade 1-11, rear auger blade 1-12, airflow injection hole 1-13, temperature sensor 1-14, insulation material 1-15, temperature acquisition device 2, control device 3, gas cylinder 4, and gas flow meter 5. Detailed Implementation

[0030] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. The purpose and effects of the present invention will become clearer. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0031] like Figure 1 As shown, a phase change thermal energy storage system with mechanical and high-speed airflow mixing and stirring device includes a phase change thermal energy storage device 1, a temperature acquisition device 2, a control device 3, a gas cylinder 4, and a gas flow meter 5.

[0032] like Figures 2-4 As shown, the phase change thermal energy storage device 1 includes a phase change material storage tank 1-1, a heat exchange tube 1-2, a heat exchange medium inlet manifold 1-3, a heat exchange medium outlet manifold 1-4, a guide rail 1-5, a lead screw buckle 1-6, a lead screw 1-7, a motor 1-8, a heating rod 1-9, a front auger blade 1-11, a rear auger blade 1-12, and a temperature sensor 1-14.

[0033] The phase change material storage tank 1-1 is wrapped with insulation material 1-15 on the outside and contains phase change material inside; the heat exchange tubes 1-2 are arranged in multiple rows in parallel and uniformly, each row is arranged in an S-shape inside the phase change material storage tank 1-1, the inlet of the heat exchange tubes 1-2 is connected to the heat exchange medium inlet header 1-3, and the outlet of the heat exchange tubes 1-2 is connected to the heat exchange medium outlet header 1-4.

[0034] The top end of the phase change material storage tank 1-1 is provided with a top cover, and three through holes are formed in the top cover at positions in front of and behind the tank body, and a lead screw 1-7 is inserted into each through hole. The lower end of the lead screw 1-7 located in front of the tank body is welded with a front auger blade 1-11, and the lower end of the lead screw 1-7 located behind the tank body is welded with a rear auger blade 1-12. The rotating directions of the front auger blade 1-11 and the rear auger blade 1-12 are opposite. The upper ends of the lead screws 1-7 are connected with a motor 1-8. The inside of the front auger blade 1-11 and the rear auger blade 1-12 is a hollow structure, and airflow injection holes 1-13 are formed in the blades. The lead screws 1-7 are hollow, and a heating rod 1-9 is arranged at the center position. A gas passage 1-10 is formed between the heating rod 1-9 and the inner wall of the lead screw 1-7, and the gas passage 1-10 is in communication with the inside of the front auger blade 1-11 and the rear auger blade 1-12. High-speed airflow can flow through the gas passage 1-10 in the lead screw 1-7 to the inside of the front auger blade 1-11 and the rear auger blade 1-12, and be injected from the airflow injection holes 1-13. A plurality of temperature sensors 1-14 inserted into the inside of the phase change material storage tank 1-1 are installed on the side surface of the phase change material storage tank 1-1, and the temperature sensors 1-14 are arranged at positions close to the front auger blade 1-11 and the rear auger blade 1-12.

[0035] As shown in Figure 5 The top cover at the top end of the phase change material storage tank 1-1 is welded with a support frame, the support frame is installed with a guide rail 1-5, a pair of lead screw buckles 1-6 are arranged at the connection positions of the lead screws 1-7 and the through holes, the lead screw buckles 1-6 are installed on the guide rail 1-5, the inner holes of the lead screw buckles 1-6 have threads corresponding to the lead screws 1-7, and the pair of lead screw buckles 1-6 tightly hold the lead screws 1-7 to realize locking of the lead screws 1-7.

[0036] In order to ventilate the phase change material, a plurality of symmetrical ventilation holes are formed in the top cover at the top end of the phase change material storage tank 1-1.

[0037] The temperature sensors 1-14 in the phase change heat storage device 1 transmit temperature signals in the phase change material storage tank 1-1 to a temperature acquisition device 2, the temperature acquisition device 2 transmits the collected temperature signals to a control device 3, a gas cylinder 4, a gas flow meter 5 and the lead screws 1-7 are sequentially communicated through pipelines, and the control device 3 is connected with and controls the gas flow meter 5, the motor 1-8, the lead screw buckles 1-6 and the heating rod 1-9.

[0038] The control device 3 drives the motor 1-8 and the screw chuck 1-6 according to the collected signals, and the screw rod 1-7 rotates under the drive of the motor 1-8. Due to the thread cooperation between the screw chuck 1-6 and the screw rod 1-7, the screw rod 1-7 moves up and down, driving the front auger blade 1-11 or the rear auger blade 1-12 to move up and down while rotating. The heat storage process of the phase change heat exchange device 1 includes heating, heat storage and heat release. During the heating of the phase change heat exchange device, the temperature of the heat exchange medium in the inlet header 1-3 is higher than that in the outlet header 1-4. The temperature sensor 1-14 inserted into the phase change heat exchange device 1 transmits signals to the temperature collection device 2, and the temperature collection device 2 transmits signals to the control device 3, which starts the heating rod 1-9 to accelerate the melting of the phase change material around the front auger blade 1-11 and the rear auger blade 1-12. After the phase change material around the front auger blade 1-11 and the rear auger blade 1-12 rises to a certain temperature, the control device 3 drives the motor 1-8 to control the rotation of the screw rod 1-7, and starts to stir and mix the solid-liquid phase change material. Since the front auger blade 1-11 and the rear auger blade 1-12 are opposite, the front auger blade 1-11 will pull up the liquid phase change material, and the rear auger blade 1-12 will push down the phase change material, so that the phase change material on the blade section forms a vortex circulation, accelerating the melting process of the phase change material; at the same time, the control device 3 opens the gas flow meter 5, high-speed gas flows through the gas channel 1-10 in the screw rod 1-7, and is sprayed from the gas jet hole 1-13 under the heating of the heating rod 1-9. The high-speed and high-temperature gas flow blows the liquid phase change material to flow, increases the contact between the liquid phase change material and the solid phase change material, and accelerates the melting.

[0039] With the progress of the heating process, the phase change material in the part of the screw rod 1-7 in the phase change material storage tank 1-1 gradually melts, and the temperature sensor 1-14 transmits signals to the temperature collection device 2, and the temperature collection device 2 transmits signals to the control device 3, which drives the screw chuck 1-6 to lock the screw rod 1-7, and drives the motor 1-8 to rotate, so that the screw rod 1-7 moves downward to the solid-liquid interface due to the thread cooperation between the screw rod 1-7 and the screw chuck 1-6; the control device 3 drives the screw chuck 1-6 to be released, and the control device 3 drives the motor 1-8 to stir the phase change material and continue to spray high-speed and high-temperature gas flow. The above-mentioned stirring, high-temperature gas flow spraying and screw rod 1-7 up and down moving steps are repeated until the heating process is completed.

[0040] Those skilled in the art can understand that the above description is only the preferred examples of the present application and is not used to limit the present application, and although the present application is described in detail with reference to the foregoing examples, those skilled in the art can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacements for part of the technical features. Any modification, equivalent replacement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A phase change thermal storage system with mechanical and high velocity airflow mixing agitation means, characterized in that, The application relates to a phase change heat storage device (1), a temperature acquisition device (2), a control device (3) and a gas cylinder (4). The phase change heat storage device (1) comprises a phase change material storage tank (1-1), heat exchange pipes (1-2), lead screws (1-7), motors (1-8), heating rods (1-9), front auger blades (1-11), rear auger blades (1-12) and temperature sensors (1-14). The phase change material storage tank (1-1) is provided with a top cover at the top end, a plurality of through holes are formed in the positions of the front and rear of the phase change material storage tank (1-1), one lead screw (1-7) is inserted into each through hole, the upper ends of the lead screws (1-7) are connected with the motors (1-8), the lower ends of the lead screws (1-7) located at the front of the phase change material storage tank (1-1) are welded with the front auger blades (1-11), the lower ends of the lead screws (1-7) located at the rear of the phase change material storage tank (1-1) are welded with the rear auger blades (1-12), the rotating directions of the front auger blades (1-11) and the rear auger blades (1-12) are opposite, the interiors of the front auger blades (1-11) and the rear auger blades (1-12) are hollow structures, and airflow injection holes (1-13) are formed in the blades, the interiors of the lead screws (1-7) are hollow, the heating rods (1-9) are arranged at the central positions of the lead screws (1-7), the heating rods (1-9) and the inner walls of the lead screws (1-7) are gas passages (1-10), the gas passages (1-10) are communicated with the interiors of the front auger blades (1-11) or the rear auger blades (1-12), high-speed airflow flows to the interiors of the front auger blades (1-11) or the rear auger blades (1-12) through the gas passages (1-10) in the lead screws (1-7) and is injected from the airflow injection holes (1-13). The phase change material storage tank (1-1) is internally filled with phase change material, the heat exchange pipes (1-2) are arranged in the phase change material storage tank (1-1), and the temperature sensors (1-14) are arranged on the side surface of the phase change material storage tank (1-1) and inserted into the phase change material storage tank (1-1). The temperature sensors (1-14) in the phase change heat storage device (1) transmit temperature signals in the phase change material storage tank (1-1) to the temperature acquisition device (2), the temperature acquisition device (2) transmits the acquired temperature signals to the control device (3), the gas cylinder (4) is communicated with the lead screws (1-7) through pipelines, and the control device (3) is connected with and controls the motors (1-8) and the heating rods (1-9).

2. The phase change thermal storage system with mechanical and high velocity airflow mixing agitation device of claim 1, wherein, Further comprising a guide rail (1-5) and a screw rod buckle (1-6); a support frame is welded on the top cover of the phase change material storage tank (1-1), and the guide rail (1-5) is installed on the support frame; a pair of screw rod buckles (1-6) are arranged at the connection between the screw rod (1-7) and the through hole of the top cover, the screw rod buckles (1-6) are installed on the guide rail (1-5), the inner hole of the screw rod buckle (1-6) has a thread corresponding to the screw rod (1-7), and the pair of screw rod buckles (1-6) lock the screw rod (1-7) through thread cooperation.

3. The phase change thermal storage system with mechanical and high velocity airflow mixing agitation device of claim 1, wherein, Further comprising a heat exchange medium inlet header (1-3) and a heat exchange medium outlet header (1-4); the heat exchange pipes (1-2) are arranged in multiple rows in parallel and uniformly, each row is arranged in an S shape inside the phase change material storage tank (1-1), the inlet of the heat exchange pipe (1-2) is in communication with the heat exchange medium inlet header (1-3), and the outlet of the heat exchange pipe (1-2) is in communication with the heat exchange medium outlet header (1-4).

4. The phase change thermal storage system with mechanical and high velocity airflow mixing agitation device of claim 1, wherein, Further comprising a gas flow meter (5), which is located between the gas cylinder (4) and the screw rod (1-7), and sequentially communicates with the gas flow meter (5), the gas cylinder (4) and the screw rod (1-7) through pipelines, and the control device (3) is connected with and controls the gas flow meter (5).

5. The phase change thermal storage system with mechanical and high velocity airflow mixing agitation device of claim 1, wherein, The phase change material storage tank (1-1) is wrapped with a heat preservation material (1-15) on the outside.

6. The phase change thermal storage system with mechanical and high velocity airflow mixing agitation device of claim 1, wherein, A plurality of air holes are formed in the top cover of the phase change material storage tank (1-1).

7. The phase change thermal storage system with mechanical and high velocity airflow mixing agitation device of claim 1, wherein, The temperature sensor (1-14) is arranged close to the front auger blade (1-11) and the rear auger blade (1-12).

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