Solid particle uniform storage and heat exchange device

Abstract

The invention discloses a solid particle uniform heat storage and exchange device, and belongs to the technical field of solid particle heat storage devices. The device comprises an air outlet pipe, a heat storage and exchange assembly and an air inlet pipe which are sequentially connected. The heat storage and exchange assembly comprises a first shell and a second shell arranged on the outer side of the first shell in a sleeving mode. The bottom end of the first shell is connected with an air inlet pipe, the side wall of the first shell can exhaust air, the first shell is used for storing solid particles, and a stirring piece is arranged in the first shell and can stir the solid particles. An interlayer is formed between the second shell and the first shell and communicates with the air outlet pipe. By arranging the first shell and the second shell, gas enters from the bottom end of the first shell, exchanges heat with solid particles in the first shell and then is discharged from the side wall of the first shell. The inlet direction of the gas is perpendicular to the exhaust direction of the gas, so that the gas can be disturbed in the first shell, the gas is in full contact with solid particles, and efficient heat exchange is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of solid particle heat storage devices, and in particular to a solid particle uniform heat storage and exchange device. Background Art

[0002] A heat storage device is a device that can store and release thermal energy. It is mainly used to solve the mismatch between energy supply and demand in time and space, thereby improving energy utilization efficiency.

[0003] Common heat storage methods include phase change heat storage, chemical reaction heat storage and sensible heat storage. Among them, phase change heat storage is to use the material to absorb a large amount of heat when it melts from solid to liquid. The advantages are high heat storage density and stable heat release temperature. The disadvantages are high cost and the material itself is flammable and volatile. Chemical reaction heat storage is to store and release heat through chemical reactions. The advantage is high energy storage density, and the disadvantage is complex technology and process. Sensible heat storage is a heat storage method that uses the temperature change of substances to store and release heat. The advantages are low cost, mature technology and good stability.

[0004] Solid particle heat storage is a sensible heat storage method that uses solid particle materials to absorb and release heat during temperature changes to achieve heat storage. When a high-temperature heat source comes into contact with solid particles, the particles absorb heat and the temperature rises, thereby storing the heat. When heat needs to be released, a low-temperature fluid passes through the solid particles, and the particles transfer heat to the fluid to achieve heat release. Solid particles can adapt to a wide temperature range, but the solid particles themselves have poor fluidity and there is a problem of uneven heat exchange when they come into contact with a heat source, making it impossible for the solid particles to fully store heat. Summary of the invention

[0005] In view of the above-mentioned deficiencies, the present invention provides a solid particle uniform heat storage and exchange device, which can increase the fluidity of the solid particles and enable the solid particles to fully store heat.

[0006] The present invention protects a solid particle uniform heat storage and exchange device, which comprises an outlet pipe, a heat storage and exchange component and an inlet pipe connected in sequence; The heat storage and exchange assembly comprises a first shell and a second shell sleeved outside the first shell; The bottom end of the first shell is connected to the air inlet pipe, the side wall of the first shell can discharge gas, the first shell is used to store solid particles, and a stirring member is provided in the first shell, and the stirring member can stir the solid particles; An interlayer is formed between the second shell and the first shell, and the interlayer is communicated with the air outlet pipe.

[0007] Further, the stirring member comprises a rotatable central tube, and the side wall of the central tube is connected to a plurality of disturbance members; The bottom end of the central tube is communicated with the air inlet pipe, and a through hole is provided on the side wall of the central tube, so that air flow can enter the first shell through the air inlet pipe and the through hole.

[0008] Furthermore, a plurality of spiral blades are provided in the central tube along the axial direction, and the blades are fixed on the inner wall of the central tube; The gas passes through the blades, which enables the blades to drive the central tube to rotate around its own axis.

[0009] Furthermore, the disturbance element comprises a hollow plate, and a surface of the hollow plate is provided with air outlet holes; The side of the hollow plate is communicated with the through hole, and the gas in the central tube can enter the hollow plate through the through hole and then be discharged from the gas outlet.

[0010] Furthermore, a first protrusion strip is provided on the side surface of the hollow plate, and the first protrusion strip can disturb the solid particles.

[0011] Furthermore, there are multiple first raised strips, and each of the first raised strips is parallel to the axis of the central tube.

[0012] Furthermore, a plurality of exhaust holes are provided on the side wall of the first shell, which can discharge the gas in the first shell into the interlayer.

[0013] Furthermore, a second raised strip is provided on the inner wall of the first shell, and the second raised strip can disturb the solid particles.

[0014] Furthermore, the second raised strip is in a spiral shape, and the solid particles at the bottom of the first shell can move along the top surface of the second raised strip to the top of the first shell.

[0015] Furthermore, it also includes a third shell, which is sleeved on the outside of the first shell and the second shell, and a vacuum layer is formed between the third shell, the first shell and the second shell.

[0016] Beneficial effects: The present invention sets a first shell and a second shell, and the gas enters from the bottom end of the first shell, exchanges heat with the solid particles in the first shell, and then is discharged from the side wall of the first shell. The gas entry direction is perpendicular to the gas discharge direction, so that the gas can be disturbed in the first shell, so that the gas and the solid particles are in full contact, and efficient heat exchange is achieved. In addition, the gas discharged from the first shell directly enters the interlayer, and the residual heat of the gas can heat the interlayer to keep the first shell warm and ensure that the solid particles can effectively store heat. By setting a stirring element, the solid particles can be driven to flow in the first shell, so that the gas can evenly exchange heat with the solid particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] in: Figure 1 It is a schematic diagram of the overall structure of a solid particle uniform heat storage and exchange device in one embodiment of the present invention; Figure 2 It is a front view of a solid particle uniform heat storage and exchange device in one embodiment of the present invention; Figure 3 for Figure 2 Cross-section view along the AA direction; Figure 4 for Figure 3 A partial enlarged view of part C in the middle; Figure 5 for Figure 3 A partial enlarged view of part D in the middle; Figure 6 for Figure 2 Cross-section along the BB direction; Figure 7 A partial cross-sectional view of a solid particle uniform heat storage and exchange device according to an embodiment of the present invention; Figure 8 It is a partial cross-sectional view of a solid particle uniform heat storage and exchange device filled with solid particles in one embodiment of the present invention; In the figure, 1. exhaust pipe; 2. heat storage and exchange assembly; 21. first shell; 211. exhaust hole; 212. second raised strip; 22. second shell; 23. third shell; 24. central tube; 25. blade; 26. disturbance member; 261. hollow plate; 262. first raised strip; 263. exhaust hole; 3. Intake pipe. DETAILED DESCRIPTION

[0019] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] The solid particle uniform heat storage and exchange device in the present invention can store heat and release heat. When high-temperature gas is introduced, the device performs a heat storage function, and the temperature of the discharged gas decreases. When low-temperature gas is introduced, the device performs a heat release function, and the temperature of the discharged gas decreases. For the sake of convenience, the heat storage function is used as an example in this application, which does not mean that the device in the present invention has no heat release function.

[0021] refer to Figure 1 to Figure 8 The present invention protects a solid particle uniform heat storage and exchange device, which includes an outlet pipe 1, a heat storage and exchange component 2 and an inlet pipe 3 connected in sequence.

[0022] The heat storage and exchange assembly 2 includes a first shell 21 and a second shell 22 sleeved outside the first shell 21 .

[0023] The bottom end of the first shell 21 is connected to the air inlet pipe 3, and the side wall of the first shell 21 can discharge gas. The first shell 21 is used to store solid particles. A stirring member is provided in the first shell 21, and the stirring member can stir the solid particles. An interlayer is formed between the second shell 22 and the first shell 21 , and the interlayer is communicated with the air outlet pipe 1 .

[0024] The present invention sets a first shell 21 and a second shell 22, and the gas enters from the bottom end of the first shell 21, exchanges heat with the solid particles in the first shell 21, and then is discharged from the side wall of the first shell 21. The gas entry direction is perpendicular to the gas discharge direction, so that the gas can be disturbed in the first shell 21, so that the gas and the solid particles are fully in contact, and efficient heat exchange is achieved. In addition, the gas discharged from the first shell 21 directly enters the interlayer, and the residual heat of the gas can heat the interlayer to keep the first shell 21 warm, ensuring that the solid particles can effectively store heat. By setting a stirring member, the solid particles can be pushed to flow in the first shell 21, so that the gas can evenly exchange heat with the solid particles.

[0025] refer to Figure 3 or Figure 4 In a specific embodiment, the stirring element includes a rotatable central tube 24 , and the side wall of the central tube 24 is connected to a plurality of disturbing elements 26 .

[0026] The bottom end of the central tube 24 is connected to the air intake pipe 3. Specifically, the bottom end of the central tube 24 is bent toward the direction of its own axis to form an n-shaped groove, which is arranged at the top end of the air intake pipe 3. The top end of the air intake pipe 3 can be inserted into the groove. According to actual needs, grease can be added to the groove and the top end to reduce the friction resistance when the central tube 24 rotates.

[0027] The side wall of the central tube 24 is provided with a through hole, and the air flow can enter the first shell 21 through the air inlet pipe 3 and the through hole.

[0028] In this embodiment, a central tube 24 is provided, and the bottom end of the central tube 24 is sleeved on the outside of the top end of the air inlet pipe 3. A through hole is provided on the side wall of the central tube 24, so that the gas in the central tube 24 can be discharged into the first shell 21. When the central tube 24 rotates, the gas in the central tube 24 can be mixed, and then the gas can be discharged from the through hole. In this way, the gas in the central tube 24 can be fully mixed, so that the temperature of the gas is as uniform as possible; and the gas can be evenly dispersed in the first shell 21, so that the solid particles can effectively exchange and store heat.

[0029] refer to Figure 3 or Figure 4 In a specific embodiment, a plurality of spiral blades 25 are provided in the central tube 24 along the axial direction, and the blades 25 are fixed on the inner wall of the central tube 24; The gas passes through the blades 25, which can cause the blades 25 to drive the central tube 24 to rotate around its own axis.

[0030] The blades 25 provided in this embodiment have two functions. The first function is to serve as a power source for the central tube 24. The gas passing through the spiral blades 25 can give the blades 25 a force to rotate around the axis of the central tube 24. Since the edge of the blades 25 away from the axis is fixed on the inner wall of the central tube 24, the rotation of the blades 25 can drive the central tube 24 to rotate. The second function is to mix the gas. The gas is usually waste heat gas from one or several other processes. The temperature of the gas may be uneven, which will affect the heat storage effect of the solid particles. After the blades 25 are provided, the gas can be mixed after passing through the blades 25, so that the temperature of the gas can be as uniform as possible.

[0031] refer to Figure 3 , Figure 5 and Figure 6 In a specific embodiment, the disturbance member 26 includes a hollow plate 261, and a gas outlet 263 is provided on the surface of the hollow plate 261. The hollow plate 261 is in the shape of a cubic plate, and one edge of the hollow plate 261 is open, and the open edge is in contact with the outer wall of the central tube 24. The hollow plate 261 is made of a material with good thermal conductivity, preferably copper or silver.

[0032] The side of the hollow plate 261 is connected to the through hole, and the gas in the central tube 24 can enter the hollow plate 261 through the through hole and then be discharged from the outlet hole 263. There are multiple outlet holes 263, and the multiple outlet holes 263 are arranged on a surface of the hollow plate 261, which is opposite to the rotation direction of the central tube 24. For example, referring to Figure 6 In this embodiment, the central tube 24 rotates counterclockwise around its own axis, and a plurality of air outlet holes 263 are provided on a side of the hollow plate 261 that is away from the rotation direction.

[0033] In this embodiment, by setting up hollow plates 261, multiple hollow plates 261 can disperse the gas in the central tube 24 to multiple directions. The purpose of selecting a material with good thermal conductivity is to reduce heat loss. The gas entering the hollow plate 261 can partially conduct the heat to the side wall of the hollow plate 261. The side wall of the hollow plate 261 is in direct contact with the solid particles, and the heat is introduced into the solid particles. There are three functions for setting the air outlet 263. The first function is to disperse and fill the gas in the first shell 21 so that the solid particles can be evenly contacted with the gas; the second function is that the gas is discharged from the air outlet 263, which can give the hollow plate 261 a reaction force. The direction of the reaction force is the same as the rotation direction of the central tube 24, which helps to drive the hollow plate 261 to rotate. The third function is to prevent clogging. The gas discharged from the air outlet 263 can promote the flow of solid particles, which can prevent the solid particles from sticking to the hollow plate 261 and causing clogging, affecting the heat exchange effect.

[0034] refer to Figure 3 or Figure 5~Figure 7 In a specific embodiment, a first protrusion bar 262 is provided on the side of the hollow plate 261, and the first protrusion bar 262 can disturb the solid particles. The first protrusion bar 262 can be provided on any side of the hollow plate 261 or on both sides of the hollow plate 261. The first protrusion bar 262 can be provided in any direction.

[0035] In this embodiment, by providing the first protruding strip 262, the solid particles can be disturbed when the hollow plate 261 rotates, so that the solid particles can flow and exchange heat better. At the same time, the first protruding strips 262 provided at different positions and angles give different directions to the solid particles, so that the solid particles can flow and exchange heat fully.

[0036] refer to Figure 6 or Figure 7 In a specific embodiment, the number of the first protrusion strips 262 is multiple, and each first protrusion strip 262 is parallel to the axis of the central tube 24. The first protrusion strips 262 are smooth protrusion strips. By limiting the first protrusion strips 262 to a vertical direction, the flow of solid particles to the outer side of the hollow plate 261 can be slowed down to a certain extent, and the outer side is the side away from the central tube 24. As many solid particles as possible can move along the circumference. Of course, the first protrusion strips 262 also have the function of disturbing the flow of solid particles, so that the solid particles can fully exchange heat.

[0037] refer to Figure 5 or Figure 7In a specific embodiment, a plurality of exhaust holes 211 are provided on the side wall of the first shell 21, which can discharge the gas in the first shell 21 into the interlayer. Among them, the plurality of exhaust holes 211 are evenly distributed on the side wall of the first shell 21. By arranging the exhaust holes 211 on the side wall, the gas in the first shell 21 can be discharged radially outwardly along the first shell 21, so that the flow direction of the gas is: the bottom end of the first shell 21 → the center tube 24 → the hollow plate 261 → the air outlet 263 → the exhaust hole 211. After the gas fully contacts and exchanges heat with the solid particles, it is discharged from the exhaust hole 211. The advantage of dispersing the exhaust holes 211 is that the gas whose temperature has been cooled can be discharged directly without being discharged in a roundabout way, so as to prevent contact with high-temperature solid particles and affect the heat storage effect of the solid particles. In addition, the gas that has been cooled first enters the interlayer and then is discharged from the outlet pipe 1. The cooled gas can heat the outer side of the side wall of the first shell 21, reduce the temperature difference between the inside and outside of the first shell 21, ensure the temperature inside the first shell 21, and improve the heat storage effect.

[0038] refer to Figure 5 In a specific embodiment, a second protrusion bar 212 is provided on the inner wall of the first shell 21, and the second protrusion bar 212 can disturb the solid particles. The number of the second protrusion bars 212 can be any number and any angle. By providing the second protrusion bar 212, the solid particles at the inner wall of the first shell 21 can be disturbed, so that the solid particles can better exchange heat.

[0039] refer to Figure 3 , Figure 7 or Figure 8 In a specific embodiment, the second raised strip 212 is in the shape of a spiral line, and the solid particles at the bottom of the first shell 21 can move along the top surface of the second raised strip 212 to the top of the first shell 21. The second raised strip 212 in this embodiment is a single strip, which is spirally arranged on the inner side wall of the first shell 21. The extension direction of the second raised strip 212 is the vertical direction. Among them, the second raised strip 212 protrudes from the inner side wall of the first shell 21 to form a spiral channel. That is, the solid particles at the bottom of the first shell 21 can move along the top surface of the second raised strip 212 to the top of the first shell 21.

[0040] In this embodiment, by providing the second raised strip 212, the solid particles can rise along the spiral channel, realize the flow and circulation of the solid particles at the bottom and the solid particles at the top, and make the solid particles at each position fully exchange and store heat, further preventing the problem of uneven heat exchange and heat storage of the solid particles.

[0041] refer to Figure 3 , Figure 7 or Figure 8In a specific embodiment, the third shell 23 is further included. The third shell 23 is sleeved on the outside of the first shell 21 and the second shell 22, and a vacuum layer is formed between the third shell 23, the first shell 21 and the second shell 22. The second shell 22 is sleeved on the outside of the side wall and the top surface of the first shell 21. The third shell 23 is sleeved on the outside of the second shell 22 on the outside of the top surface and the side wall. The third shell 23 is sleeved on the outside of the first shell 21 on the outside of the bottom surface.

[0042] In this embodiment, by providing the third shell 23, a vacuum layer can be effectively formed. The vacuum layer has a heat preservation effect. It can maintain high temperature or low temperature. It prevents the bottom surface of the first shell 21 or the top surface and side wall of the second shell 22 from exchanging too much heat with the outside world. It has a strong heat storage effect.

[0043] refer to Figure 8 , the first shell 21 is filled with solid particles. The solid particles can be selected as ceramic particles. Ceramic materials have the advantages of high temperature resistance, good chemical stability, and relatively high thermal conductivity. For example, alumina ceramic particles can withstand high temperatures and can work in high temperature environments above 1000°C, which are suitable for high temperature heat storage systems. Moreover, the surface of ceramic particles is relatively smooth, the friction between particles is small, and they are not easy to wear and pulverize during long-term use. The solid particles can also be selected as metal particles. The thermal conductivity of metal particles is very high and can quickly absorb and release heat. For example, the thermal conductivity of copper particles is much higher than that of ceramic particles, which has advantages in some application scenarios that require high heat transfer speeds. The solid particles can also be selected as rock particles. Rock particles are low in cost and easy to obtain. For example, in some large-scale industrial waste heat recovery systems, using local granite processing particles as heat storage media can reduce costs.

[0044] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A solid particle uniform heat storage and exchange device, characterized in that: It comprises an air outlet pipe (1), a heat storage and exchange component (2) and an air inlet pipe (3) which are connected in sequence; The heat storage and exchange assembly (2) comprises a first shell (21) and a second shell (22) sleeved on the outside of the first shell (21); The bottom end of the first shell (21) is connected to the air inlet pipe (3); the side wall of the first shell (21) is capable of discharging gas; the first shell (21) is used to store solid particles; a stirring element is provided in the first shell (21); and the stirring element is capable of stirring the solid particles; An interlayer is formed between the second shell (22) and the first shell (21), and the interlayer is in communication with the air outlet pipe (1); The stirring member comprises a rotatable central tube (24), the side wall of the central tube (24) being connected to a plurality of disturbance members (26); The bottom end of the central tube (24) is in communication with the air inlet pipe (3), and a through hole is provided on the side wall of the central tube (24), so that air can pass through the air inlet pipe (3) and the through hole and enter the first shell (21).

2. The solid particle uniform heat storage and exchange device according to claim 1 is characterized in that: A plurality of spiral blades (25) are arranged in the center tube (24) along the axial direction, and the blades (25) are fixed on the inner wall of the center tube (24); The gas passes through the blades (25), so that the blades (25) can drive the central tube (24) to rotate around its own axis.

3. The solid particle uniform heat storage and exchange device according to claim 2 is characterized in that: The disturbance member (26) comprises a hollow plate (261), and a gas outlet hole (263) is provided on the surface of the hollow plate (261); The side edge of the hollow plate (261) is in communication with the through hole, and the gas in the central tube (24) can enter the hollow plate (261) through the through hole and then be discharged from the gas outlet (263).

4. The solid particle uniform heat storage and exchange device according to claim 3 is characterized in that: A first protruding strip (262) is provided on the side surface of the hollow plate (261), and the first protruding strip (262) can disturb the solid particles.

5. The solid particle uniform heat storage and exchange device according to claim 4, characterized in that: There are a plurality of first protruding strips (262), and each of the first protruding strips (262) is parallel to the axis of the central tube (24).

6. The solid particle uniform heat storage and exchange device according to claim 1, characterized in that: A plurality of exhaust holes (211) are provided on the side wall of the first shell (21), which can exhaust the gas in the first shell (21) into the interlayer.

7. The solid particle uniform heat storage and exchange device according to claim 1, characterized in that: A second protrusion strip (212) is provided on the inner wall of the first shell (21), and the second protrusion strip (212) can disturb the solid particles.

8. The solid particle uniform heat storage and exchange device according to claim 7, characterized in that: The second raised strip (212) is in the shape of a spiral line, and solid particles at the bottom of the first shell (21) can move along the top surface of the second raised strip (212) to the top of the first shell (21).

9. The solid particle uniform heat storage and exchange device according to claim 1, characterized in that: It also comprises a third shell (23), wherein the third shell (23) is sleeved on the outside of the first shell (21) and the second shell (22), and a vacuum layer is formed between the third shell (23), the first shell (21) and the second shell (22).

Images