A particle lifting device and system for a solar thermal power station

Abstract

The present invention belongs to the technical field of solar thermal power generation, and particularly relates to a particle lifting device and system for a solar thermal power station. It mainly includes a particle lifting unit and a particle thermal system; the particle lifting unit includes a particle heat preservation tank, a particle container, a heat preservation cover, a connecting line for realizing the sliding of the heat preservation cover, a spring for fixing the heat preservation cover, and a bottom cover; the particle thermal system includes a stepping motor, a crawler belt transported by the stepping motor, an inlet buffer tank arranged on the crawler belt, a heat absorber arranged below the inlet buffer tank, a particle hot tank arranged below the heat absorber, a heat exchanger arranged below the particle hot tank, a particle cold tank arranged below the heat exchanger, and an outlet buffer tank arranged below the particle cold tank; the particle lifting unit is installed on the crawler belt and transported to the inlet buffer tank by the stepping motor. The present invention can realize the temperature control during the particle lifting process, reduce energy loss, and ensure that the rotating components are in a normal temperature environment, improving the reliability of the system.

Description

Technical Field

[0001] The present invention belongs to the technical field of solar thermal power generation, and particularly relates to a particle lifting device for a solar thermal power station. Background Art

[0002] The solar tower thermal power generation technology has been in the research and development stage of the third-generation technology, and one of the technical key points is to increase the temperature of the working fluid, requiring the maximum temperature to reach above 700 degrees. Compared with traditional solar salt, solid particles can withstand temperatures as high as more than 1000 degrees, and have stable performance, large specific heat, low price, easy availability, and easy storage. Therefore, they have attracted the attention of experts and scholars in the field of solar thermal power generation.

[0003] When using solid particles as the working fluid to replace traditional solar salt, a key technical problem to be solved is how to stably and efficiently lift the solid particles, reduce the leakage of particles and energy loss during the lifting process, and ensure the safety and reliability of the lifting equipment. At present, the lifting of particles mainly uses a mine hoist, with a lifting height of up to 1000 meters, but a large amount of heat loss will occur during the loading and unloading process. Using a bucket elevator, the equipment is compact, the layout space is small, and continuous unloading can be achieved. However, for multi-stage lifting, the reliability is low, leakage is easy during unloading, the lifting efficiency is low, and the rotating parts are in a high-temperature environment for a long time, requiring high-quality materials.

[0004] Therefore, how to balance the safety and reliability of the lifting equipment and ensure no leakage and low heat loss of the particles is the key technical problem for whether solid particles can be used as the heat absorption and storage medium in the third-generation tower-type solar thermal power generation field. Summary of the Invention

[0005] The purpose of the present invention is to provide a particle lifting device and system for a solar thermal power station to solve the problems of easy leakage of particles and low lifting efficiency during the loading and unloading process.

[0006] The above technical object of the present invention is achieved by the following technical solutions:

[0007] A particle lifting device for a solar thermal power station mainly includes a particle lifting unit and a particle thermal system;

[0008] The particle lifting unit includes a particle heat preservation tank, a particle container arranged in the particle heat preservation tank, a heat preservation cover arranged on the top of the particle container, a connecting line arranged on the top of the particle heat preservation tank and used to realize the sliding of the heat preservation cover, a spring for fixing the heat preservation cover, and a bottom cover arranged at the bottom of the particle container;

[0009] The granular thermal system includes a stepper motor, a track belt transported by the stepper motor, an inlet buffer tank arranged on the track belt, a heat absorber arranged below the inlet buffer tank, a granular heat tank arranged below the heat absorber, a heat exchanger arranged below the granular heat tank, a granular cold tank arranged below the heat exchanger, and an outlet buffer tank arranged below the granular cold tank;

[0010] The granular lifting unit is installed on the track belt and transported to the inlet buffer tank by the stepper motor.

[0011] Preferably, the granular heat preservation tank includes a baffle, a chute, a spring mounting block, a fixed pulley, a track belt mounting block, a heat transfer module, with a heating module mounted on the back, a connecting wire mounting plate, and a thermal expansion and contraction module, showing the state after the thermal expansion and contraction module extends.

[0012] Preferably, the granular container includes a container inner liner and a slider; the granular container is installed in the chute inside the granular heat preservation tank through the slider, enabling the granular container to slide vertically, reaching up to the heat preservation cover and down to the heat transfer module.

[0013] Preferably, the heat preservation cover is fixed to the spring mounting block by a spring and connected to the connecting wire mounting plate by a connecting wire passing around two groups of fixed pulleys, and can slide horizontally on the top of the granular heat preservation tank to open and close.

[0014] Preferably, the heat transfer module is installed at the bottom of the granular heat preservation tank, which can absorb part of the heat in the granular container and quickly transfer it to the heating module on the back, heating the thermal expansion and contraction module, and then pushing the connecting wire mounting plate to move, realizing the opening and closing of the heat preservation cover.

[0015] Preferably, a bottom cover is installed on the back of the granular heat preservation tank to reduce heat loss at the back. Track belt mounting blocks are installed on both sides of the granular heat preservation tank, which cooperate with the track belt and are driven by the stepper motor to circulate and transport the granular heat preservation tank.

[0016] Preferably, the granular lifting unit absorbs the heat of sunlight through the heat absorber and the temperature rises; the high-temperature granules are stored after entering the granular heat tank, and the temperature decreases after heat exchange with the working medium in the heat exchanger. The low-temperature granules are stored after entering the granular cold tank, enter the granular lifting unit through the outlet buffer tank, and are re-transported to the inlet buffer tank by the granular lifting device, thus completing the thermal cycle of the granules.

[0017] In summary, the present invention has the following beneficial effects:

[0018] 1. According to the requirements such as light intensity, quantitative loading and unloading of granules can be realized, and no granule leakage is guaranteed during the loading and unloading process, with high lifting efficiency;

[0019] 2. The temperature control during the particle lifting process is realized, which reduces energy loss, ensures that the rotating components are in a normal temperature environment, reduces material costs, and improves the reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the particle lifting unit in the particle lifting device for a solar thermal power plant according to the present invention;

[0021] Figure 2 is a schematic diagram of the open state of the thermal insulation cover of the particle lifting unit in the particle lifting device for a solar thermal power plant according to the present invention;

[0022] Figure 3 is a schematic diagram of the particle container in the particle lifting device for a solar thermal power plant according to the present invention;

[0023] Figure 4 is a schematic diagram of the particle thermal insulation device in the particle lifting device for a solar thermal power plant according to the present invention;

[0024] Figure 5 is a schematic diagram of the back of the particle thermal insulation device in the particle lifting device for a solar thermal power plant according to the present invention;

[0025] Figure 6 is a schematic diagram of the back of the particle thermal insulation device after being used in the particle lifting device for a solar thermal power plant according to the present invention;

[0026] Figure 7 is a schematic diagram of the particle thermal system according to the present invention;

[0027] In the figure, 1 - particle lifting unit, 2 - particle thermal insulation tank, 3 - particle container, 4 - thermal insulation cover, 5 - connecting wire, 6 - spring, 7 - bottom cover; 8 - inner container of the container, 9 - slider, 10 - baffle, 11 - chute, 12 - spring mounting block, 13 - fixed pulley, 14 - crawler mounting block, 15 - heat transfer module, 16 - heating module, 17 - connecting wire mounting plate, 18 - thermal expansion and contraction module, 19 - state after the thermal expansion and contraction module extends, 20 - stepping motor, 21 - crawler, 22 - inlet buffer tank, 23 - solar receiver, 24 - particle hot tank, 25 - heat exchanger, 26 - particle cold tank, 27 - outlet buffer tank. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Embodiment 1

[0029] Please refer to Figures 1 - 5As shown in the figure, a preferred embodiment of the particle lifting unit 1 mainly includes a particle heat preservation tank 2, a particle container 3, a heat preservation cover 4, a connecting line 5, a spring 6, and a bottom cover 7. The particle heat preservation tank 2 includes a baffle 10, a chute 11, a spring mounting block 12, a fixed pulley 13, a crawler mounting block 14, a heat transfer module 15, a heating module 16 mounted on the back, a connecting line mounting plate 17, a thermal expansion and contraction module 18, and the state after the thermal expansion and contraction module extends 19. The particle container 3 includes a container inner liner 8 and a slider 9. Among them, the particle container 3 is installed in the chute 11 inside the particle heat preservation tank 2 through the slider 9, and can slide vertically. It can reach the heat preservation cover 4 at the top and the heat transfer module 15 at the bottom. The heat preservation cover 4 is fixed on the spring mounting block 12 through the spring 6, and is connected to the connecting line 17 mounting plate by bypassing two groups of fixed pulleys 13 through the connecting line 5, and can slide horizontally at the top of the particle heat preservation tank 2 to open and close. The heat transfer module 15 is installed at the bottom of the particle heat preservation tank 2, which can absorb part of the heat in the particle container 3 and quickly transfer it to the heating module 16 on the back, heat the thermal expansion and contraction module 18, and then push the connecting line 17 mounting plate to move, realizing the opening and closing of the heat preservation cover. The bottom cover 7 is installed on the back of the particle heat preservation tank 2 to reduce heat loss on the back. Crawler mounting blocks 14 are installed on both sides of the particle heat preservation tank 2, which cooperate with the crawler 21 and are driven by the stepping motor 20 to circulate and convey the particle heat preservation tank 2.

[0030] Embodiment 2

[0031] Please refer to Figure 6 and Figure 7 As shown in the figure, a preferred embodiment of the particle thermal system mainly includes a stepping motor 20, a crawler 21, an inlet buffer tank 22, a heat absorber 23, a particle heat tank 24, a heat exchanger 25, a particle cold tank 26, and an outlet buffer tank 27. The particle lifting unit is installed on the crawler 21 and transported to the inlet buffer tank 22 by the stepping motor 20, and then absorbs the solar heat through the heat absorber 23 and the temperature rises. The high-temperature particles are stored in the particle heat tank 24 and cooled after heat exchange with the working fluid in the heat exchanger 25. The low-temperature particles are stored in the particle cold tank 26, enter the particle lifting unit 1 through the outlet buffer tank 27, and are re-transported to the inlet buffer tank 22 by the particle lifting device to complete the thermal cycle of the particles.

[0032] Working principle: In the initial state, as the low-temperature particles are continuously transported from the outlet buffer tank to the particle lifting unit, the particle container slowly descends, and the temperature continuously rises until it contacts the bottom heat transfer module. The heat transfer module transfers heat to the back heating module, thereby increasing the temperature of the thermal expansion and contraction module. After elongation, it drives the connecting wire mounting plate to generate displacement, pulls the heat preservation cover through the connecting wire and the fixed pulley, and finally closes the particle lifting unit. Subsequently, the stepping motor drives the crawler to move. After the particle lifting unit rotates clockwise by 90 degrees and then lifts upward, when it moves to the inlet buffer tank, it rotates clockwise by 90 degrees. At this time, under the action of gravity, the particle container disengages from the heat transfer module and closely contacts the heat preservation cover. The temperature of the heating module rapidly decreases, the thermal expansion and contraction module contracts, the heat preservation cover is opened under the elastic force of the spring, and the particles in the particle container are poured into the inlet buffer tank. The stepping motor continuously drives the crawler to move. After the particle lifting unit experiences two clockwise 90-degree rotations, it moves back to the outlet buffer tank, thus completing the entire cycle of particle loading, unloading, and lifting.

[0033] This specific embodiment is only an explanation of the present invention and is not a limitation thereof. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A particle lifting device for a solar thermal power station, characterized in that It includes a particle lifting unit (1) and a particle thermal system; The particle lifting unit (1) includes a particle heat preservation tank (2), a particle container (3) arranged inside the particle heat preservation tank (2), a heat preservation cover (4) arranged at the top of the particle container (3), a connecting line (5) arranged at the top of the particle heat preservation tank (2) and used to realize the sliding of the heat preservation cover (4), a spring (6) for fixing the heat preservation cover (4), and a bottom cover (7) arranged at the bottom of the particle container (3); The particle thermal system includes a stepping motor (20), a crawler belt (21) transported by the stepping motor (20), an inlet buffer tank (22) arranged on the crawler belt (21), a heat absorber (23) arranged below the inlet buffer tank (22), a particle heat tank (24) arranged below the heat absorber (23), a heat exchanger (25) arranged below the particle heat tank (24), a particle cold tank (26) arranged below the heat exchanger (25), and an outlet buffer tank (27) arranged below the particle cold tank (26); The particle lifting unit (1) is installed on the crawler belt (21) and transported to the inlet buffer tank (22) by the stepping motor (20); The particle heat preservation tank (2) includes a baffle (10) arranged on the upper part of the outer wall of the particle heat preservation tank (2), a chute (11) arranged inside the particle heat preservation tank (2), a spring mounting block (12), a fixed pulley (13), a crawler mounting block (14) arranged on the outer side wall of the particle heat preservation tank (2), a heat transfer module (15) installed at the bottom of the particle heat preservation tank (2), a heating module (16) installed on the back, a connecting line mounting plate (17), and a thermal expansion and contraction module (18); The heat preservation cover (4) is fixed on the spring mounting block (12) by the spring (6), and is connected to the connecting line (17) mounting plate by bypassing two groups of fixed pulleys (13) through the connecting line (5), and slides horizontally on the top of the particle heat preservation tank (2) to realize opening and closing; The heat transfer module (15) is installed at the bottom of the particle heat preservation tank (2), which can absorb part of the heat in the particle container (3) and quickly transfer it to the heating module (16) on the back, heat the thermal expansion and contraction module (18), and then push the connecting line (17) mounting plate to move, realizing the opening and closing of the heat preservation cover.

2. The particle lifting device for a solar thermal power station according to claim 1, characterized in that: The particle container (3) includes a container inner liner (8) and a slider (9). The particle container (3) is installed in the chute (11) inside the particle heat preservation tank (2) through the slider (9) to realize the sliding of the particle container (3) in the vertical direction, up to the heat preservation cover (4) and down to the heat transfer module (15).

3. The particle lifting device for a solar thermal power station according to claim 2, characterized in that: The bottom cover (7) is installed on the back of the particle heat preservation tank (2), and the crawler mounting blocks (14) are installed on both sides of the particle heat preservation tank (2), which cooperate with the crawler belt (21) to circularly transport the particle heat preservation tank (2) under the drive of the stepping motor (20).

4. The particle lifting device for a solar thermal power plant according to claim 3, wherein: The particle lifting unit (1) absorbs the heat of sunlight through the solar receiver (23), and its temperature rises; the high-temperature particles are stored after entering the particle hot storage tank (24), and their temperature decreases after exchanging heat with the working fluid in the heat exchanger (25); the low-temperature particles are stored after entering the particle cold storage tank (26), enter the particle lifting unit (1) through the outlet buffer tank (27), and are re-transported to the inlet buffer tank (22) by the particle lifting device, thus completing the thermal cycle of the particles.

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