A quartz window type solid particle heat absorber and solar thermal power generation system

Abstract

The present invention discloses a quartz window-type solid particle heat absorber and a solar thermal power generation system. The solid particle heat absorber includes a heat absorber cavity, the heat absorber cavity includes a heat absorption port and a particle inlet, a glass curtain wall and an inclined plate are arranged in the heat absorber cavity, the glass curtain wall is arranged between the heat absorption port and the inclined plate, and particles enter the heat absorber cavity through the particle inlet and fall along the surface of the inclined plate under the action of gravity. The present invention arranges the glass curtain wall and the inclined plate in the heat absorber cavity, and solar radiation is radiated through the glass curtain wall to the particles sliding down the inclined plate. Therefore, the glass curtain wall can eliminate the influence of external environmental wind on the interior of the heat absorber cavity, preventing the particles from being blown out of the heat absorber by the wind. At the same time, the inclined plate with a certain tilt angle is used as a particle flow channel, effectively slowing down the falling speed of the particles.

Description

Technical Field

[0001] The present invention belongs to the technical field of solar thermal power generation, and in particular relates to a quartz window type solid particle heat absorber and a solar thermal power generation system. Background Art

[0002] Solar energy is gaining increasing application as a clean, renewable energy source. Concentrated solar power generation (CSP), in particular, is an emerging solar energy utilization technology following photovoltaics. Tower-type CSP technology, with its advantages of cost-effective and efficient energy storage and stable and smooth power output, has garnered widespread attention. A tower solar power station primarily consists of a heliostat field, a heat receiver, a heat storage system, and a steam turbine generator set. The heat receiver system is a key component in converting solar energy into thermal energy, and ensuring its high performance and safe operation is a crucial component in the research and application of CSP.

[0003] Traditional solar thermal absorbers use binary molten salt as the heat absorption medium. When the operating temperature is below 250°C, the molten salt solidifies, and above 565°C, the molten salt decomposes, affecting both safe operation and system efficiency. To improve the efficiency of solar thermal power generation and reduce power generation costs, research on new high-temperature solar thermal absorber structures is particularly important. Solid particles absorb heat at high temperatures and are inexpensive, making them one of the main development directions for third-generation solar thermal power generation and heat storage technology. Major research institutions around the world have conducted extensive research on solid particle heat storage devices and developed different technical approaches. Sandia National Laboratory in the United States proposed a free-falling particle absorber, demonstrating the feasibility of the particle absorber concept. However, free-falling particle absorbers have difficulty controlling the particle drop speed and mass flow rate, and are significantly affected by ambient winds. In strong winds, particles can easily be blown out of the absorber. Summary of the Invention

[0004] In response to the above technical problems, the present invention provides a quartz window type solid particle heat absorber and a solar thermal power generation system. A glass curtain wall and an inclined plate are arranged in the heat absorber cavity. Solar radiation is radiated through the glass curtain wall to the particles sliding down the inclined plate. Therefore, the glass curtain wall can eliminate the influence of the external environment wind on the inside of the heat absorber cavity, and prevent the particles from being blown out of the heat absorber by the wind. At the same time, an inclined plate with a certain inclination angle is used as a particle flow channel to effectively slow down the falling speed of the particles.

[0005] To achieve the above object, the technical solution of the present invention is:

[0006] A quartz window-type solid particle heat absorber includes a heat absorber cavity, which includes a heat absorption port and a particle inlet. A light-transmitting curtain wall and an inclined plate are arranged in the heat absorber cavity. The light-transmitting curtain wall is arranged between the heat absorption port and the inclined plate. Particles enter the heat absorber cavity through the particle inlet and fall along the surface of the inclined plate under the action of gravity.

[0007] In this embodiment, the light-transmitting curtain wall is a glass curtain wall. In a solar thermal power generation system, especially a tower-type solar thermal power generation system, a large-area glass curtain wall needs to be set in the absorber. Due to the process limitations of glass processing, a large-area glass curtain wall is difficult to process. Therefore, the glass curtain wall of this embodiment is composed of multiple quartz glass blocks, and support frames are provided between the quartz glass blocks.

[0008] Since solar radiation passes through the glass curtain wall and heats the heat-absorbing particles, the temperature of the glass curtain wall and the support frame will also rise, resulting in heat loss. Therefore, in this embodiment, a heat exchange medium fluid is used to cool the glass curtain wall and the support frame, and the heated heat exchange medium fluid heats the particles on the inclined plate;

[0009] Therefore, a heat exchange fluid buffer tank needs to be provided to store the heat exchange medium fluid, a support frame pipeline is provided in the support frame, and the heat exchange fluid buffer tank is connected to the support frame pipeline;

[0010] A heat exchange fluid channel is provided in the inclined plate, the support frame pipeline is communicated with the inlet of the heat exchange fluid channel, and the outlet of the heat exchange fluid channel is communicated with the heat exchange fluid buffer tank.

[0011] In a specific embodiment, a low-temperature main pipe and a high-temperature main pipe can be provided. The low-temperature main pipe is connected to the high-temperature main pipe through a support frame pipe. The heat exchange medium fluid in the heat exchange fluid buffer tank first flows into the low-temperature main pipe and is distributed to the support frame pipe through the low-temperature main pipe. The heat exchange medium fluid after absorbing heat is collected and flows into the high-temperature main pipe and then flows into the heat exchange fluid channel of the inclined plate through the high-temperature main pipe.

[0012] In this embodiment, interconnected heat exchange medium passages are provided in the support frame and the inclined plate of the glass curtain wall. The heat exchange medium is used to reduce the temperature of the glass curtain wall. At the same time, the heated heat exchange medium heats the particles on the inclined plate and is finally circulated back to the heat exchange fluid buffer tank.

[0013] Along the direction perpendicular to the center line of the inclined plate, the inclined plate includes a first region, a second region, and a third region. The first region and the third region are distributed on both sides of the second region. The particles are heated by solar radiation on the inclined plate. Due to the Gaussian distribution of the incident energy flux density, the temperature of the heat-absorbing particles is high in the middle and low on both sides, and the temperature difference is large, that is, the temperature of the particles in the first region and the third region is lower than the temperature of the particles in the second region.

[0014] In order to make the particle temperature in the first, second and third regions uniform, in this embodiment, the heated high-temperature medium fluid flowing out of the glass curtain wall support frame flows in an "S" shape in the inclined plate, first flowing to the heat exchange fluid flow channels in the first or third regions distributed on both sides, that is,

[0015] The heat exchange medium fluid flowing out of the high-temperature main pipe flows into the heat exchange fluid channels of the first area, the second area and the third area in sequence, flows out of the inclined plate, and returns to the heat exchange fluid buffer tank.

[0016] In order to increase the temperature of the heat exchange medium fluid in the support frame pipeline, the outer surface of the support frame is coated with a heat absorbing coating.

[0017] In order to controllably adjust the flow rate of the heat exchange medium fluid, a first flow valve is provided on the connecting pipe between the heat exchange fluid buffer tank and the support frame pipe, and a second flow valve is provided on the pipe connecting the heat exchange fluid channel and the heat exchange fluid buffer tank.

[0018] A booster pump is provided on the pipeline connecting the heat exchange fluid channel and the heat exchange fluid buffer tank to provide pressure for the heat exchange medium fluid.

[0019] The inner wall of the heat absorber cavity is coated with a high-reflectivity coating or a high-reflective patch, which reflects the incident light reflected by the glass curtain wall through the wall of the heat absorber cavity. At the same time, the energy that passes through the glass curtain wall but is not absorbed by the particles is also reflected again by the wall of the heat absorber cavity to the inclined plate. The high-reflective coating or high-reflective patch can enhance the reflection efficiency of visible light.

[0020] The surface of the glass curtain wall away from the heat absorption port is provided with an infrared reflective film, which reflects the infrared radiation radiated by the particles on the inclined plate back to the particles, and visible light can pass through the infrared reflective film.

[0021] The solid particle heat absorber also includes a particle buffer tank and a high-temperature particle storage tank. The particle buffer tank is connected to the particle inlet, and the high-temperature particle storage tank is arranged at the lower part of the heat absorber cavity and is connected to the particle outlet of the heat absorber cavity.

[0022] In order to controllably adjust the flow rate of solid particles, a third flow valve is provided on the pipeline connecting the particle buffer tank and the particle inlet, and a fourth flow valve is provided on the pipeline connecting the high-temperature particle storage tank and the particle outlet.

[0023] The upper surface of the inclined plate is provided with a plurality of protrusions, which block part of the particles on the inclined plate and the particles remaining on the surface of the inclined plate, thereby reducing the wear of the particles on the surface of the inclined plate.

[0024] The present invention also provides a solar thermal power generation system, comprising the above-mentioned quartz window type solid particle heat absorber.

[0025] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0026] 1. In one embodiment of the present invention, a glass curtain wall is arranged in the heat absorber cavity, and solar radiation enters the heat absorber cavity through the heat absorption port. The solar radiation is radiated into the particles in the heat absorber cavity through the glass curtain wall. The glass curtain wall not only eliminates the influence of the external environment wind on the interior of the heat absorber cavity, but also prevents the particles from being blown out of the heat absorber by the wind. At the same time, since the glass curtain wall is arranged in the heat absorber cavity, compared with the case where the glass curtain wall is arranged on the heat absorption port, the sunlight reflected by the glass curtain wall is reflected again onto the glass curtain wall through the inner wall surface of the heat absorber cavity, and will not be reflected outside the heat absorber cavity, thereby effectively improving the thermal efficiency of the heat absorber.

[0027] At the same time, an inclined plate with a certain angle is set in the heat absorber cavity. The particles entering the heat absorber cavity fall onto the inclined plate and slide on the inclined plate under the action of gravity, which can slow down the falling speed of the particles and increase the time for the particles to absorb heat.

[0028] 2. The glass curtain wall is made of quartz glass blocks supported by a support frame, which not only solves the problem that large-area quartz glass curtain walls cannot be processed, but also increases the strength of the glass curtain wall and improves the reliability of the structure.

[0029] Furthermore, in order to solve the problem of solar energy loss caused by the support frame absorbing solar radiation energy, in another embodiment, the interior of the support frame can be designed to be interconnected support frame pipes, and a heat exchange fluid channel connected to the support frame pipe is set in the inclined plate. The pipe is filled with heat exchange medium fluid. After the heat exchange medium fluid flows through the support frame pipe, the temperature of the glass curtain wall and the support frame is reduced, and at the same time, the lost solar radiation energy is converted into the heat exchange medium fluid. The heated heat exchange medium fluid enters the inclined plate, heats the particles on the inclined plate, and significantly improves the heat absorption efficiency.

[0030] 3. Due to the Gaussian distribution of the incident energy flux density, the heat-absorbing particles exhibit a high temperature in the middle and a low temperature on both sides, resulting in a large temperature difference. To uniformly distribute the temperature of the particles on the inclined plate, the heat exchange medium fluid is designed to flow in an "S" shape within the inclined plate. That is, along the centerline perpendicular to the inclined plate's inclination, the heat exchange medium fluid first flows to the heat exchange fluid channels in the first or third zones on either side. Since the particles in the first and third zones are at lower temperatures, the heat exchange medium fluid first exchanges heat with the particles on either side, heating the particles in the corresponding zones. After heat exchange, the heat exchange medium fluid temperature drops. It then flows to the heat exchange fluid channels in the second zone located in the middle, absorbing heat from the particles in the second zone. Finally, it flows into the heat exchange fluid channels in the third or first zones, where the heat-absorbed heat is again supplied to the particles in the third or first zones. The low-temperature heat exchange medium fluid, after heat exchange, flows out of the inclined plate through the outlet of the heat exchange fluid channels. Therefore, the aforementioned structure utilizes the heat exchange medium fluid to "smooth out" the temperature of the particles on the inclined plate, significantly improving the uniformity of the particle temperature while recovering the heat exchange medium fluid's energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic structural diagram of a quartz window type solid particle heat absorber according to Example 1 of the present invention;

[0032] Figure 2 This is a structural schematic diagram of an implementation method of a glass curtain wall according to Example 1 of the present invention;

[0033] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure of the middle support frame;

[0034] Figure 4 This is a schematic structural diagram of an implementation scheme of a heat exchange fluid channel in an inclined plate according to Example 1 of the present invention;

[0035] Figure 5 for Figure 4 Schematic diagram of the cross section of AA.

[0036] Explanation of the reference numerals: 1-heat exchange fluid buffer tank; 2-first flow valve; 3-reflection line; 4-absorber cavity; 5-heat absorption port; 6-glass curtain wall; 7-particle outlet; 8-high-temperature particle storage tank; 9-fourth flow valve; 10-inclined plate; 11-second flow valve; 12-third flow valve; 13-particle buffer tank; 14-boosting pump; 15-particle inlet; 601-low-temperature main pipe; 602-quartz glass block; 603-support frame pipe; 604-high-temperature main pipe; 605-support frame; 606-groove; 101-heat exchange fluid channel outlet, 102-first area; 103-second area; 104-third area; 105-heat exchange fluid channel inlet; 106-heat exchange fluid channel. DETAILED DESCRIPTION

[0037] The following is a further detailed description of a quartz window solid particle heat absorber and a solar thermal power generation system proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description.

[0038] Example 1

[0039] See Figure 1 A quartz window type solid particle heat absorber includes a heat absorber cavity 4, a particle buffer tank 13 and a high-temperature particle storage tank 8. The heat absorber cavity 4 includes a heat absorption port 5, a particle inlet 15 and a particle outlet 7. The particle inlet 15 is arranged at the upper part of the heat absorber cavity 4, and the particle outlet 7 is arranged at the bottom of the heat absorber cavity 4. A glass curtain wall 6 and an inclined plate 10 are arranged in the heat absorber cavity 4. The glass curtain wall 6 is arranged between the heat absorption port 5 and the inclined plate 10.

[0040] The particle buffer tank 13 is connected to the particle inlet 15. The high-temperature particle storage tank 8 is located at the bottom of the heat absorber cavity 4 and is connected to the particle outlet 7 of the heat absorber cavity 4. The particles enter the heat absorber cavity 4 through the particle inlet 15 and fall along the surface of the inclined plate 10 under the action of gravity. A particle flow channel can be provided on the inclined plate 10 using a partition to prevent the particles from falling off the inclined plate 10.

[0041] The glass curtain wall 6 is located between the inclined plate 10 and the heat absorption port 5, which is equivalent to the inclined plate 10 being arranged in the small cavity formed by the glass curtain wall 6 and the wall surface of the heat absorber cavity 4. Therefore, the glass curtain wall 6 not only eliminates the influence of the external environment wind on the inside of the heat absorber cavity 4, but also completely avoids the possibility of particles being blown out of the heat absorber by the wind; at the same time, since the glass curtain wall 6 is arranged in the heat absorber cavity 4, the quartz glass window does not need to bear its own gravity, thereby improving the structural reliability. At the same time, the high reflectivity of the heat absorber cavity 4 wall surface can reflect most of the solar radiation not absorbed by the particles for a second time and retain it in the heat absorber (such as Figure 1 The reflection line 3 shown indicates that the visible light reflected by the glass curtain wall 6 is reflected again by the inner wall of the absorber cavity 4), which effectively improves the thermal efficiency of the absorber.

[0042] In order to increase the reflection effect avoided by the absorber cavity 4, the inner wall of the absorber cavity 4 is coated with a high-reflectivity coating or a high-reflectivity material such as a white ceramic patch. The incident light reflected by the glass curtain wall 6 is reflected by the wall of the absorber cavity 4. At the same time, the energy that passes through the glass curtain wall 6 but is not absorbed by the particles is also reflected again by the wall of the absorber cavity 4 to the inclined plate 10. The high-reflectivity coating or high-reflectivity patch can enhance the reflection efficiency of visible light.

[0043] An inclined plate 10 is installed within the heat absorber cavity 4. Particles entering the heat absorber cavity 4 fall onto the inclined plate 10 and slide down it under the force of gravity, slowing the particles' descent and increasing the time they absorb heat. The inclined plate 10's angle can be set based on the particles' repose angle and adjusted based on test results.

[0044] In a solar thermal power generation system, especially a tower solar thermal power generation system, a large area of ​​glass curtain wall 6 needs to be set in the absorber. Due to the limitation of glass processing technology, a large area of ​​glass curtain wall 6 is difficult to process. Therefore, the glass curtain wall 6 of this embodiment is composed of multiple quartz glass blocks 602 (such as Figure 2 As shown), a support frame 605 is provided between the quartz glass blocks 602.

[0045] Since solar radiation heats the heat-absorbing particles through the glass curtain wall 6, the temperature of the glass curtain wall 6 and the support frame 605 will also rise, resulting in heat loss. Therefore, in this embodiment, a heat exchange medium fluid is used to cool the glass curtain wall 6 and the support frame 605. The heated heat exchange medium fluid can heat the particles on the inclined plate 10. Therefore, a heat exchange fluid buffer tank 1 is provided to store the heat exchange medium fluid, a support frame pipe 603 is provided in the support frame 605, and a heat exchange fluid channel 106 is provided in the inclined plate 10, and the support frame pipe 603 and the heat exchange fluid channel 106 are connected.

[0046] The upper part of the support frame pipe 603 is connected to the heat exchange fluid buffer tank 1, the lower part is connected to the bottom inlet of the heat exchange fluid channel 106, and the upper outlet of the heat exchange fluid channel 106 is connected to the heat exchange fluid buffer tank 1, forming a circulation loop of the heat exchange medium fluid.

[0047] In this embodiment, interconnected heat exchange medium passages are provided within the support frame 605 of the glass curtain wall 6 and within the inclined plate 10. The heat exchange medium is used to lower the temperature of the glass curtain wall 6. Simultaneously, the heated heat exchange medium heats the particles on the inclined plate 10 and is finally circulated back to the heat exchange fluid buffer tank 1.

[0048] like Figure 2-3 As shown, in the embodiment of the glass curtain wall 6 and support frame pipe 603, the quartz glass blocks 602 are designed to be square, and the cross-section of the support frame is also square. That is, each quartz glass block 602 is embedded in a groove 606 of the support frame 605, similar to a "window". Multiple quartz glass blocks 602 are spliced ​​and assembled together using a structure similar to a "window" to form the entire glass curtain wall 6. A low-temperature main pipe 601 and a high-temperature main pipe 604 are provided. The low-temperature main pipe 601 is located in the upper left portion of the glass curtain wall 6 and communicates with the upper portion of the vertical support frame pipe 603 and the left side of the horizontal support frame pipe 603. The high-temperature main pipe 604 is located in the lower right portion of the glass curtain wall 6 and communicates with the lower portion of the vertical support frame pipe 603 and the right side of the horizontal support frame pipe 603. The heat exchange fluid buffer tank 1 is connected to the low-temperature main pipe 601, and the heat exchange fluid channel 106 is connected to the high-temperature main pipe 604.

[0049] The heat exchange medium fluid flowing out of the heat exchange fluid buffer tank 1 enters the low-temperature main pipe 601 and is then distributed into each support frame pipe 603 . Finally, the heat exchange medium fluid after absorbing heat is collected in the high-temperature main pipe 604 .

[0050] In addition to the above-mentioned embodiments, those skilled in the art may adopt other arrangements according to actual use requirements, such as a circular support frame, a grooved support frame, etc. The support frame pipe 603 may also be arranged in a serpentine, U-shaped, etc. At the same time, fins and other enhanced heat exchange devices may also be provided in the pipe, as long as the energy absorbed by the support frame can be quickly taken away.

[0051] Along a direction perpendicular to the centerline of the inclined plate 10 in its inclination direction, the inclined plate 10 includes a first region 102, a second region 103, and a third region 104. The first region 102 and the third region 104 are distributed on both sides of the second region 103. The particles are heated by solar radiation on the inclined plate 10. Due to the Gaussian distribution of the incident energy flux density, the temperature of the heat-absorbing particles is higher in the middle and lower on both sides, and the temperature difference is large. That is, the temperature of the particles in the first region 102 and the third region 104 is lower than the temperature of the particles in the second region 103.

[0052] In order to make the particle temperature in the first area 102, the second area 103 and the third area 104 uniform, in this embodiment, the heated high-temperature heat exchange medium fluid flowing out of the support frame 605 of the glass curtain wall 6 flows in an "S" shape in the inclined plate 10, first flowing to the heat exchange fluid flow channels in the first area 102 or the third area 104 distributed on both sides, that is,

[0053] The heat exchange medium fluid flowing out of the high temperature main pipe 604 flows into the heat exchange fluid channels 106 of the first area 102 , the second area 103 and the third area 104 in sequence, flows out of the inclined plate 10 , and returns to the heat exchange fluid buffer tank 1 .

[0054] The heat exchange fluid channel 106 in the inclined plate 10 can be designed as follows Figure 4-5 In the structure shown, the heat exchange fluid channel 106 is divided into three regions. The heat exchange fluid channel 106 in each region can be separated by a partition. The heat exchange fluid channel inlet 105 is designed at the bottom of the third region 104, and the heat exchange fluid channel outlet 101 is set at the upper part of the first region 102. Figure 4-5 The embodiment presented is not limited to this structure. Those skilled in the art can arrange appropriate heat exchange fluid channels according to actual conditions, such as serpentine arrangement, horizontal arrangement, etc., as long as the channel can achieve uniform particle temperature.

[0055] In order to increase the temperature of the heat exchange medium fluid in the support frame pipe 603, the outer surface of the support frame 605 is coated with a heat absorbing coating.

[0056] In order to control the flow of heat exchange medium fluid and solid particles, a first flow valve 2 is set on the connecting pipe between the heat exchange fluid buffer tank 1 and the low-temperature main pipe 601, and a second flow valve 11 is set on the pipe connecting the heat exchange fluid channel 106 and the heat exchange fluid buffer tank 1.

[0057] A third flow valve 12 is provided on the pipeline connecting the particle buffer tank 13 and the particle inlet 15 , and a fourth flow valve 9 is provided on the pipeline connecting the high-temperature particle storage tank 8 and the particle outlet 7 .

[0058] A booster pump 14 is provided on the pipeline connecting the heat exchange fluid channel 106 and the heat exchange fluid buffer tank 1 to provide pressure for the heat exchange medium fluid.

[0059] The surface of the glass curtain wall 6 away from the heat absorption port 5 is coated with an infrared reflective film, which reflects the infrared radiation radiated by the particles on the inclined plate 10 back to the particles, and visible light can pass through the infrared reflective film.

[0060] The upper surface of the inclined plate 10 is provided with several protrusions, which block part of the particles on the inclined plate 10 and reduce the wear of the particles on the surface of the inclined plate 10.

[0061] The working principle of the solid particle heat absorber of this embodiment is as follows:

[0062] The low-temperature particles enter the heat absorber cavity 4 through the particle buffer tank 13 and slide downward along the inclined plate 10 under the action of gravity, absorbing the incident radiation. The particles after absorbing heat enter the high-temperature particle storage tank 8 through the fourth regulating valve, completing the particle heat absorption process. At the same time, the heat exchange medium fluid enters the low-temperature main pipe 601 from the heat exchange fluid buffer tank 1 under the action of the booster pump 14, and is distributed to each branch pipe of the quartz glass block 602 through the low-temperature main pipe 601. The surface of the support frame 605 is coated with a high-absorption rate coating. After absorbing the incident radiation, the heat is transferred to the heat exchange medium fluid. The heat exchange medium fluid after absorbing heat is collected in the high-temperature main pipe 604 and enters the heat exchange fluid channel 106 inside the inclined plate 10 through the entrance of the heat exchange fluid channel 106 on the inclined plate 10. Since the incident energy flow density is Gaussian distributed, the temperature of the heat-absorbing particles is high in the middle and low on both sides, and the temperature difference is large. The heat exchange fluid entering the internal part of the inclined plate 10 The high-temperature heat exchange fluid in channel 106 first flows through the heat exchange fluid channel 106 of the third area 104, exchanges heat with the particles on the third area 104 of the inclined plate 10 and heats the particles in this area. After the heat exchange, the temperature of the heat exchange medium fluid drops and enters the heat exchange fluid channel 106 of the second area 103, absorbs part of the heat of the high-temperature particles in the second area 103, and then enters the heat exchange fluid channel 106 of the first area 102, exchanges heat with the particles on the first area 102 of the inclined plate 10 and heats the particles in this area. The low-temperature heat exchange medium fluid after the heat exchange leaves the inclined plate 10 through the outlet of the heat exchange fluid channel 106 and flows to the heat exchange fluid buffer tank 1, completing the circulation of the heat exchange fluid.

[0063] It can be understood that since the incident radiation at the heat absorption port 5 presents a Gaussian distribution, the energy flux density irradiated on the middle position of the inclined plate 10 is high, and the energy flux density on both sides is low. Through the heat exchange between the heat exchange medium fluid and the inclined plate 10 and the heat exchange between the particles and the inclined plate 10, the temperature of the particles at different positions on the inclined plate 10 is effectively uniformed, and at the same time, the temperature of the inclined plate 10 itself is also relatively uniform, effectively avoiding the generation of hot spots at positions with high energy flux density and damage to the inclined plate 10.

[0064] Example 2

[0065] This embodiment provides a solar thermal power generation system, including the quartz window solid particle heat absorber of Example 1, which is arranged on the top of a heat absorption tower.

[0066] The embodiments of the present invention have been described in detail above with reference to 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 scope of protection of the present invention.

Claims

1. A quartz window type solid particle heat absorber, comprising a heat absorber cavity and a heat exchange fluid buffer tank, wherein the heat absorber cavity comprises a heat absorption port and a particle inlet, characterized in that: A light-transmitting curtain wall and an inclined plate are provided in the heat absorber cavity, wherein the light-transmitting curtain wall is provided between the heat absorption port and the inclined plate. Particles enter the heat absorber cavity through the particle inlet and fall along the surface of the inclined plate under the action of gravity. The light-transmitting curtain wall is a glass curtain wall, which includes a support frame and a plurality of quartz glass blocks, and the glass curtain wall is formed by splicing the plurality of quartz glass blocks via the support frame; A support frame pipeline is provided in the support frame, and the heat exchange fluid buffer tank is connected to the inlet of the support frame pipeline; A heat exchange fluid channel is provided in the inclined plate, the outlet of the support frame pipeline is communicated with the inlet of the heat exchange fluid channel, and the outlet of the heat exchange fluid channel is communicated with the heat exchange fluid buffer tank; The low-temperature heat exchange medium fluid flowing out of the heat exchange fluid buffer tank flows into the support frame pipe. The high-temperature heat exchange medium fluid heated by solar radiation enters the heat exchange fluid channel in the inclined plate through the outlet of the support frame pipe and flows in an "S" shape in the inclined plate.

2. The quartz window type solid particle heat absorber according to claim 1, characterized in that: Along a direction perpendicular to the center line of the inclined plate, the inclined plate includes a first area, a second area, and a third area, wherein the first area and the third area are distributed on both sides of the second area. The heat exchange medium fluid flowing out of the support frame pipeline flows into the heat exchange fluid channels of the first area, the second area and the third area in sequence, flows out of the inclined plate, and returns to the heat exchange fluid buffer tank.

3. The quartz window type solid particle heat absorber according to claim 1, characterized in that: The outer surface of the support frame is coated with a heat-absorbing coating.

4. The quartz window type solid particle heat absorber according to claim 1, characterized in that: A booster pump is provided on the pipeline connecting the heat exchange fluid channel and the heat exchange fluid buffer tank.

5. The quartz window type solid particle heat absorber according to claim 1, characterized in that: The surface of the glass curtain wall away from the heat absorption port is provided with an infrared reflective film.

6. The quartz window type solid particle heat absorber according to claim 1, characterized in that: A plurality of protrusions are provided on the upper surface of the inclined plate.

7. A solar thermal power generation system comprising the quartz window solid particle heat absorber according to any one of claims 1 to 6.

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