A particle heat storage device

Abstract

The present invention discloses a particle heat storage and transfer device, which at least includes a first heat absorption module, a second heat absorption module, a hot tank, a cold tank and a heat exchanger. The heat exchanger is arranged between the hot tank and the cold tank. The particles in the hot tank enter the cold tank after heat exchange in the heat exchanger. The first heat absorption module and the second heat absorption module both include a heat absorber, a lifting component and a particle transport component. The lifting component is connected to the heat absorber and is used to drive the heat absorber to rise and fall. When the heat absorber rises to the top of the stroke, the particles absorb heat. When the heat absorber descends to the bottom of the stroke, the particles in the heat absorber enter the hot tank, and the particles in the cold tank are transported to the heat absorber through the particle transport component. The heat absorbers in the first heat absorption module and the second heat absorption module rise and fall alternately. The present invention modularizes the heat absorber, and replaces the movement of the heat absorbing particles in the heat absorber with the alternating up and down movement of the heat absorber, which is conducive to precise control of the heat absorption process and avoids the problem of heat absorption rate caused by the free fall of particles.

Description

Technical Field

[0001] The invention belongs to the technical field of solar thermal power generation, and in particular relates to a particle heat storage and transfer device. Background Art

[0002] The cost per kilowatt-hour of solar thermal power generation technology is relatively high. Increasing the heat storage temperature to improve power generation efficiency is one of the main ways to reduce the cost per kilowatt-hour. Currently, the heat storage medium commonly used in tower solar power is binary molten salt, which has an applicable temperature limit of 600°C. Therefore, it is urgent to develop a higher temperature and cheaper heat storage technology.

[0003] Solid particles have high heat absorption temperature and low price of related equipment, which is one of the main development directions of the third generation of solar thermal power generation heat absorption and storage technology. The particle heat absorber is the core equipment of the solid heat absorption and storage system. The existing particle heat absorbers that have entered the experimental test stage include: free-fall heat absorbers, quartz tube heat absorbers, etc. However, the aforementioned heat absorber forms all have certain defects, such as the free-fall heat absorber flow control is difficult and easy to drift, and the quartz tube heat absorber is easy to cause tube wall wear and local high temperature. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a particle heat storage and transfer device.

[0005] The technical solution of the present invention is:

[0006] A particle heat storage and transfer device comprises at least a first heat absorption module, a second heat absorption module, a hot tank, a cold tank and a heat exchanger, wherein the heat exchanger is arranged between the hot tank and the cold tank, and the particles in the hot tank enter the cold tank after heat exchange by the heat exchanger;

[0007] The first heat absorption module and the second heat absorption module both include a heat absorber, a lifting assembly and a particle transport assembly, wherein the lifting assembly is connected to the heat absorber and is used to drive the heat absorber to rise and fall; when the heat absorber rises to the top of the stroke, the particles absorb heat, and when the heat absorber descends to the bottom of the stroke, the particles in the heat absorber enter the hot tank, and the particles in the cold tank are transported to the heat absorber through the particle transport assembly;

[0008] The heat absorbers in the first heat absorption module and the second heat absorption module rise and fall alternately.

[0009] In one embodiment, an air curtain machine is provided on the heat absorber.

[0010] In one embodiment, the lifting assembly includes:

[0011] The rotating member is arranged vertically and has an external thread on its outer wall;

[0012] A lifting member is sleeved on the rotating member and is threadedly connected thereto; the heat absorber is connected to the lifting member and moves with the lifting member;

[0013] A driving member is connected to the rotating member and is used to drive the rotating member to rotate along its axis; a limiting member is connected to the heat absorber and / or the lifting member and is used to limit the lifting member to only allow lifting and lowering movements along the axis of the rotating member.

[0014] In one embodiment, the rotating member is hollow inside, and its bottom is connected to the cold tank, and an opening connected to the heat absorber is provided on the rotating member;

[0015] The heat absorber is provided with a feed port, and when the heat absorber descends to the bottom end of the stroke, the feed port and the opening are butted against each other.

[0016] In one embodiment, a one-way valve is provided on the feed port.

[0017] In one embodiment, the particle transport component comprises:

[0018] A lifting pipe, connected to the bottom of the cold tank and the rotating member respectively;

[0019] The hydraulic mechanism has a piston at its output end, the piston extends into the interior of the lifting tube and is slidably connected with the inner wall of the lifting tube.

[0020] In one embodiment, the cold tank is provided with a plurality of cold tank outlets, and the cold tank is connected with the lifting pipe through the cold tank outlets; the inner bottom surface of the cold tank has a plurality of inclined surfaces respectively inclined toward the cold tank outlets.

[0021] In one embodiment, the hot tank has an upwardly disposed hot tank opening, the bottom of the heat absorber is provided with a downwardly disposed discharge port, and a discharge valve is provided on the discharge port; when the heat absorber descends to the bottom end of the stroke, the discharge port is aligned with the hot tank opening.

[0022] In one embodiment, the hot tank includes a hot tank body and a plurality of discharge pipes corresponding to the plurality of heat absorbers, and the heat exchanger is connected to the hot tank body;

[0023] The discharge pipe is vertically arranged and provided with a valve, the bottom of which is connected with the hot tank body, and the top of which is provided with the hot tank opening.

[0024] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0025] The particle heat storage and transfer device provided by the present invention modularizes the heat absorber and replaces the movement of the heat absorbing particles in the heat absorber with the alternating up and down movement of the heat absorber, which is conducive to precise control of the heat absorption process and avoids the heat absorption rate problem caused by the free fall of particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the following detailed description of the preferred embodiment.The drawings are only for the purpose of illustrating the preferred embodiments and are not to be construed as limiting the invention.

[0027] Figure 1 It is a schematic structural diagram of a particle heat storage and transfer device of the present invention.

[0028] Description of reference numerals:

[0029] 1: Heat absorber; 2: Discharge pipe; 3: Translucent glass; 4: Air curtain machine; 5: Discharge valve; 6: Check valve; 7: Lifting part; 8: Rotating part; 9: Driving part; 10: Hot tank body; 11: Heat exchanger; 12: Cold tank; 13: Lifting pipe; 14: Piston; 15: Hydraulic mechanism. DETAILED DESCRIPTION

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0031] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0032] See also Figure 1, this embodiment provides a particle heat storage and transfer device, which at least includes a first heat absorption module, a second heat absorption module, a hot tank, a cold tank 12 and a heat exchanger 11. The heat exchanger 11 is arranged between the hot tank and the cold tank 12. The particles in the hot tank enter the cold tank after heat exchange in the heat exchanger 11. The first heat absorption module and the second heat absorption module both include a heat absorber 1, a lifting component and a particle transport component. The lifting component is connected to the heat absorber 1 and is used to drive the heat absorber 1 to rise and fall. When the heat absorber 1 rises to the top of the stroke, the particle absorption process is carried out. When the heat absorber 1 descends to the bottom of the stroke, the particles in the heat absorber 1 enter the hot tank, and the particles in the cold tank 12 are transported to the heat absorber 1 through the particle transport component. The heat absorbers 1 in the first heat absorption module and the second heat absorption module rise and fall alternately.

[0033] In this embodiment, the heat absorber 1 is modularly arranged, and the movement of the heat absorbing particles in the heat absorber 1 is replaced by the alternating up and down movement of the heat absorber 1, which is conducive to precise control of the heat absorption process and avoids the heat absorption rate problem caused by the free fall of particles.

[0034] The structure of this embodiment is now described.

[0035] Multiple heat absorption modules rise and fall alternately to realize the discharge and replenishment of particles in the heat absorber 1. In this embodiment, at least the first heat absorption module and the second heat absorption module are included, and the heat absorber 1 of the first heat absorption module and the second heat absorption module rises and falls alternately. After the first heat absorption module (or the second heat absorption module) completes the heat absorption, it descends and discharges the particles in the heat absorber 1 into the hot tank; at the same time, the second heat absorption module (or the first heat absorption module) that completes the cold particle filling rises, receives light energy, and completes the particle absorption process. Of course, in other embodiments, more heat absorption modules may be included, and this is not limited.

[0036] The heat absorber 1 is provided with a light-transmitting glass 3, and the particles absorb heat on the inner side of the light-transmitting glass 3, that is, inside the heat absorber 1. An air curtain machine 4 can be provided on the heat absorber 1 to generate a gas curtain inside the light-transmitting glass 3 of the heat absorber 1 to isolate the light-transmitting glass 3 from the particles in the heat absorber 1. That is, during the heat absorption process, the air curtain machine 4 is continuously turned on to form a gas curtain on the inner surface of the light-transmitting glass 3, isolating the solid particles from the light-transmitting glass 3, thereby protecting the light-transmitting glass 3 (preventing contact and wear of the particles). At the same time, the airflow formed by the gas curtain will form a gas disturbance in the body of the heat absorber 1, which can play a role in mixing the solid particles at different positions, so that the particles are heated more evenly during heat absorption. Specifically in this embodiment, the air curtain machine 4 can be a wind curtain machine, but this is not limited.

[0037] The lifting assembly includes a rotating member 8, a lifting member 7 and a driving member 9. The rotating member 8 is arranged vertically and has an external thread on its outer wall. The lifting member 7 is sleeved on the rotating member 8 and is threadedly connected to it, and the heat absorber 1 is connected to the lifting member 7 and moves with the lifting member 7. The driving member 9 is connected to the rotating member 8 to drive the rotating member 8 to rotate along its axis. At the same time, a limiter is connected to the heat absorber 1 and / or the lifting member 7 to limit the lifting member 7 to only allow the lifting movement along the axis of the rotating member 8. In this way, when the driving member 9 drives the rotating member 8 to rotate, due to the action of the thread and the limiter, the lifting member 7 can be lifted and lowered on the rotating member 8, thereby driving the heat absorber 1 to lift and lower. Specifically, the rotating member 8 can be a hollow tube, the bottom of which is connected to the cold tank 12, the top is closed, and the outer wall of the hollow tube is provided with an external thread. The limiter can include an external slide rail and a slider arranged on the lifting member 7, the slider slides in the slide rail, and the sliding direction is the same as the axial direction of the rotating member 8. The driving member 9 can use a progressive motor. Among them, the rotating member 8, the limiting member, the driving member 9, etc. can also adopt other structures in other embodiments, which is not limited to this.

[0038] The rotating member 8 is hollow inside, and the bottom is connected to the cold tank 12. The rotating member 8 is provided with an opening connected to the inside. The heat absorber 1 is provided with a feed port, and the feed port and the opening are connected when the heat absorber 1 descends to the bottom of the stroke. A one-way valve 6 is provided on the feed port of the heat absorber 1, which can only be opened to the heat absorber 1 side.

[0039] The particle transport assembly includes a lifting tube 13 and a hydraulic mechanism 15. The lifting tube 13 is connected to the bottom of the cold tank 12 and the rotating member 8 respectively. The hydraulic mechanism 15 is arranged under the lifting tube 13, and a piston 14 is arranged on its output end. A through hole is provided at the bottom of the lifting tube 13, and the telescopic rod of the hydraulic mechanism 15 passes through the through hole to enter the lifting tube 13. The piston 14 is arranged at one end of the telescopic rod extending into the lifting tube 13 (that is, the output end of the hydraulic mechanism 15), and is slidably connected to the inner wall of the lifting tube 13. The telescopic rod is slidably connected to the through hole, and a sealing structure is provided at the connection to prevent particle leakage. The sealing structure can adopt a sealing ring, etc., which is not limited here. The hydraulic device drives the telescopic rod to rise and fall, and pushes the piston 14 upward during the rising process, thereby filling the emptied heat absorber 1 with particles.

[0040] The cold tank 12 is provided with a plurality of cold tank outlets, and the cold tank 12 is connected to the lifting tube 13 through the cold tank outlets. When the heat absorber 1 descends to the bottom of the stroke, the piston 14 is located below the cold tank outlet. The inner bottom surface of the cold tank 12 has a plurality of inclined surfaces that are inclined toward the cold tank outlets, respectively, so that the particles can flow smoothly into the lifting tube 13. When the heat absorber 1 rises to the top of the stroke, the outer aperture of the part of the telescopic rod inside the lifting tube 13 is the same as the inner aperture of the lifting tube 13, so that after the piston 14 moves up, the telescopic rod can close the cold tank opening.

[0041] The hot tank has an upwardly disposed hot tank opening, and a downwardly disposed discharge port is disposed at the bottom of the heat absorber 1, and a discharge valve 5 is disposed on the discharge port. Specifically, the hot tank may include a hot tank body 10 and a plurality of discharge pipes 2 corresponding to the plurality of heat absorbers 1, respectively. The heat exchanger 11 is connected to the hot tank body 10, and the discharge pipe 2 is vertically disposed and provided with a valve, and its bottom is connected to the hot tank body 10, and a hot tank opening is disposed on the top. When the heat absorber 1 descends to the bottom of the stroke, the discharge port docks with the hot tank opening, the discharge valve 5 and the valve on the discharge pipe are opened, and the hot particles in the heat absorber 1 fall into the discharge pipe 2 under the action of gravity, and then are discharged into the hot tank. Specifically, the docking of the discharge port and the hot tank opening may be that part of the pipeline of the heat absorber 1 at the discharge port is inserted into the discharge pipe 2 from the hot tank opening, and a sealing ring may be disposed on the pipeline at the discharge port of the heat absorber 1 to achieve sealing when the discharge pipe 2 is inserted; of course, there may be other docking methods in other embodiments, which are not limited here.

[0042] The particle heat storage and transfer device provided in this embodiment uses hydraulic propulsion to achieve particle transportation, with a compact structure and high efficiency; a closed heat absorber 1 is used, and the heat absorption modules are alternately raised and lowered, which improves the heat absorption efficiency and is easy to control the heat absorption power of each heat absorption module, and the number of heat absorption modules is adjusted according to light resources. At the same time, the modular design is conducive to system maintenance; compared with the conventional cavity drop heat absorber 1, a closed design is adopted to avoid the dispersion of heat absorption particles and is also easy to control the flow rate; compared with the tube heat absorber 1, an air curtain design is adopted to avoid the contact between solid particles and the light-transmitting glass 3, and to avoid the wear of the light-transmitting glass 3. In addition, the airflow generated by the air curtain can cause particle mixing in the heat absorption cavity of the heat absorber 1, so that the particles are heated more evenly, and local overheating will not occur, so as to avoid local burn-through of the heat absorber 1. The particle heat storage and transfer device provided in this embodiment solves the problem of unstable particle dispersion of the cavity heat absorber 1 and the problem of wear between particles and the tube wall of the tube heat absorber 1.

[0043] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. A particle heat storage and transfer device, characterized in that: At least includes a first heat absorption module, a second heat absorption module, a hot tank, a cold tank and a heat exchanger, wherein the heat exchanger is arranged between the hot tank and the cold tank, and the particles in the hot tank enter the cold tank after heat exchange in the heat exchanger; The first heat absorption module and the second heat absorption module both include a heat absorber, a lifting assembly and a particle transport assembly, wherein the lifting assembly is connected to the heat absorber and is used to drive the heat absorber to rise and fall; when the heat absorber rises to the top of the stroke, the particles absorb heat, and when the heat absorber descends to the bottom of the stroke, the particles in the heat absorber enter the hot tank, and the particles in the cold tank are transported to the heat absorber through the particle transport assembly; The heat absorbers in the first heat absorption module and the second heat absorption module rise and fall alternately.

2. The particle heat storage device according to claim 1, characterized in that: An air curtain machine is arranged on the heat absorber.

3. The particle heat storage and transfer device according to claim 1, characterized in that: The lifting assembly comprises: The rotating member is arranged vertically and has an external thread on its outer wall; A lifting member is sleeved on the rotating member and is threadedly connected thereto; the heat absorber is connected to the lifting member and moves with the lifting member; A driving member is connected to the rotating member and is used to drive the rotating member to rotate along its axis; a limiting member is connected to the heat absorber and / or the lifting member and is used to limit the lifting member to only allow lifting and lowering movements along the axis of the rotating member.

4. The particle heat storage device according to claim 3, characterized in that: The rotating member is hollow inside, and its bottom is connected to the cold tank, and an opening connected to the heat absorber is provided on the rotating member; The heat absorber is provided with a feed port, and when the heat absorber descends to the bottom end of the stroke, the feed port and the opening are butted against each other.

5. The particle heat storage and transfer device according to claim 4, characterized in that: A one-way valve is arranged on the feed inlet.

6. The particle heat storage and transfer device according to claim 4, characterized in that: The particle transport component comprises: A lifting pipe, connected to the bottom of the cold tank and the rotating member respectively; The hydraulic mechanism has a piston at its output end, the piston extends into the interior of the lifting tube and is slidably connected with the inner wall of the lifting tube.

7. The particle heat storage and transfer device according to claim 6, characterized in that: The cold tank is provided with a plurality of cold tank outlets, and the cold tank is connected with the lifting pipe through the cold tank outlets; the inner bottom surface of the cold tank has a plurality of inclined surfaces respectively inclined toward the cold tank outlets.

8. The particle heat storage and transfer device according to claim 1, characterized in that: The hot tank has an upwardly disposed hot tank opening, the bottom of the heat absorber is provided with a downwardly disposed discharge port, and a discharge valve is provided on the discharge port; when the heat absorber descends to the bottom end of the stroke, the discharge port is aligned with the hot tank opening.

9. The particle heat storage and transfer device according to claim 8, characterized in that: The hot tank comprises a hot tank body and a plurality of discharge pipes respectively corresponding to the plurality of heat absorbers, and the heat exchanger is connected to the hot tank body; The discharge pipe is vertically arranged and provided with a valve, the bottom of which is connected with the hot tank body, and the top of which is provided with the hot tank opening.

Images