Obstruction System of Granular-Falling Solar Absorber

Abstract

The obstruction system of the granular falling solar heat absorber of the present invention is arranged inside the heat absorber and includes multiple sets of blocking mechanisms arranged staggeredly from top to bottom. The above-mentioned blocking mechanism includes a horizontal adjusting rod and a plurality of blocking units arranged along its horizontal extension direction and movably connected thereto. The above-mentioned blocking unit includes a vertical connecting rod, a slider, a cam, an elastic component, a top plate and a bottom plate; the upper end of the above-mentioned vertical connecting rod is movably connected to the above-mentioned horizontal adjusting rod, the lower end of the above-mentioned vertical connecting rod is movably connected to the above-mentioned cam, and the left and right sides of the edge of the above-mentioned cam are respectively fitted with the above-mentioned sliders; the upper and lower sides of the above-mentioned slider are respectively slidably fitted with the inner parts of the top plate and the bottom plate; the above-mentioned elastic component is fixed between the inner end of the above-mentioned slider and the outer end of the above-mentioned top plate. Thus, it is possible to adjust and control the residence time and heating temperature of the particles inside the heat absorber according to the intensity of solar light.

Description

Technical Field

[0001] The present invention relates to the technical field of solar tower concentrating thermal power generation, and particularly to an obstruction system for a particle-drop solar energy absorber. Background Art

[0002] Solar tower thermal power generation reflects and concentrates direct solar radiation onto an absorber installed at a certain height through a solar field of heliostats. The absorber collects the solar heat energy, and transmits and delivers the thermal energy to a thermal energy storage device and a steam generator on the ground to generate steam, which in turn drives a steam turbine to generate electricity. Among them, the heat-absorbing medium uses particles, such as desert sand and other grits, with a particle size of 200 - 600 microns. By utilizing the characteristics of grits being high-temperature resistant, corrosion resistant, wear resistant, and inexpensive, the material cost of solar thermal power generation is reduced. The cost performance of grits is better than that of tower-type thermal power generation using other media such as molten salt (a mixture of 60% sodium nitrate + 40% potassium nitrate) as the heat-absorbing and heat-storing medium.

[0003] Specifically, as Figure 1 shown in the solar tower thermal power generation system with a particulate heat-absorbing medium, the sunlight 3 reflected by the heliostat 4 converges on the absorber 100. Then, the particle dropping port 5 at the top of the absorber 100 is opened, and the particles drop. After the dropped particles absorb solar energy, their temperature can be raised to above 700°C. The intensity of sunlight changes continuously throughout the day. Therefore, the particle dropping flow rate and process also need to be continuously adjusted, and the flow rate is controlled according to the intensity of solar illumination. However, the existing particle-drop absorbers only have the free-falling type (without a blocking device) and a simple obstructive type of absorber form. For example, Figure 2 shown in the inverted V-shaped baffle 17 is arranged inside the absorber 100 as a blocking mechanism for particle dropping, and as Figure 3 shown in the hexagonal block 19 is arranged inside the absorber 100 as a blocking mechanism for particle dropping. Obviously, the above existing blocking mechanisms have the following disadvantages: they are all static components, unable to actively adjust the process of particle dropping flow, unable to accurately adjust and control the particle temperature, and thus unable to set the particle flow rate according to the solar illumination change to achieve the optimal heat absorption effect.

[0004] In view of the above defects existing in the existing absorber blocking system, an innovative obstruction system for a particle-drop solar energy absorber is needed, which can control the residence time and heating temperature of particles inside the absorber according to the intensity of solar illumination, so as to flexibly achieve on-demand transmission and storage of thermal energy, save energy and protect the environment, and enhance economic value. Summary of the Invention

[0005] Aiming at the defects existing in the above-mentioned prior art, the main object of the present invention is to provide an obstruction system for a granular falling solar heat absorber, which controls the throughput of the granules to control the residence time and heating temperature of the granules inside the heat absorber.

[0006] The technical means adopted by the present invention are as follows.

[0007] The obstruction system of the granular falling solar heat absorber is arranged inside the heat absorber, and is characterized in that it includes multiple groups of blocking mechanisms arranged staggeredly from top to bottom. Among them, the blocking mechanism includes a horizontal adjusting rod and a plurality of blocking units arranged along its horizontal extension direction and movably connected thereto. Among them, the blocking unit includes a vertical connecting rod, a slider, a cam, an elastic member, a top plate and a bottom plate. The upper end of the vertical connecting rod is movably connected to the horizontal adjusting rod, the lower end of the vertical connecting rod is movably connected to the cam, the left and right sides of the edge of the cam are respectively fitted with the slider, the upper and lower sides of the slider are respectively slidably fitted with the inner parts of the top plate and the bottom plate, and the elastic member is fixed between the inner end of the slider and the outer end of the top plate.

[0008] Furthermore, the lengths of the blocking units in each group of the blocking mechanisms distributed from top to bottom gradually increase.

[0009] Furthermore, the horizontal spacings of the plurality of blocking units arranged on the horizontal adjusting rod are equal.

[0010] Furthermore, the horizontal adjusting rod can be controlled manually or electrically to move left and right along the horizontal direction.

[0011] Furthermore, the rotation angles of the vertical connecting rod and the cam are between 0 degrees and 90 degrees.

[0012] Furthermore, the cam is a wheel shape with symmetric protrusions on its edge.

[0013] Furthermore, the slider is a flat cuboid, and its inner end has an upward protrusion.

[0014] Furthermore, the outer end of the top plate extends downward to form a protrusion, and the elastic member is provided between the upward protrusion at the inner end of the slider and the protrusion.

[0015] Furthermore, the elastic member is a spring.

[0016] Advantages of the present invention: An innovative blocking system for a particle-drop solar heat absorber is proposed. A cam mechanism is used to drive the movement of a slider, thereby adjusting the width of the horizontal opening of the blocking mechanism, enabling the adjustable function of the path space for particle dropping, so as to achieve the regulation of the residence time and heating temperature of the particles inside the heat absorber according to the change of solar illumination. Moreover, the system has the characteristics of low cost, simple structure, easy operation, and easy control, thus maximizing the economic value. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. is a schematic structural diagram of an existing solar tower thermal power generation system with particles as the heat absorption medium.

[0018] Figure 2 FIG. is a schematic internal structure diagram of an existing inverted V-shaped blocking heat absorber.

[0019] Figure 3 FIG. is a schematic internal structure diagram of an existing hexagonal block blocking heat absorber

[0020] Figure 4 FIG. is a schematic diagram of the overall layout mode of the present invention inside the heat absorber.

[0021] Figure 5 FIG. is a schematic structural diagram of the blocking unit of the present invention.

[0022] Figure 6 FIG. is a schematic diagram of the slider expansion of the blocking unit of the present invention.

[0023] Figure 7 FIG. is a schematic diagram for comparing the change of the adjustment state of the blocking mechanism of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] As Figure 4 and Figure 5 shown, the blocking system of the particle-drop solar heat absorber of the present invention is arranged inside the heat absorber 100 and includes multiple groups of blocking mechanisms 30 arranged staggeredly from top to bottom. Among them, the above-mentioned blocking mechanism 30 includes a horizontal adjusting rod 10 and multiple blocking units 20 arranged along its horizontal extension direction and movably connected thereto. The above-mentioned blocking unit 20 includes a vertical connecting rod 21, a slider 22, a cam 23, an elastic member 24, a top plate 25, and a bottom plate 26. The upper end of the above-mentioned vertical connecting rod 21 is movably connected to the above-mentioned horizontal adjusting rod 10, and the lower end of the above-mentioned vertical connecting rod 21 is movably connected to the above-mentioned cam 23. The left and right sides of the edge of the above-mentioned cam 23 are respectively in contact with the above-mentioned slider 22. The upper and lower sides of the above-mentioned slider 22 are respectively in sliding contact with the inner parts of the above-mentioned top plate 25 and the above-mentioned bottom plate 26. The above-mentioned elastic member 24 is fixed between the inner end of the above-mentioned slider 22 and the outer end of the above-mentioned top plate 25.

[0025] Preferably, the lengths of the blocking units 20 in each of the above-mentioned blocking mechanisms 30 distributed from top to bottom gradually increase.

[0026] Preferably, the horizontal spacings of the multiple blocking units 20 arranged on the horizontal adjusting rod 10 are equal.

[0027] Preferably, the horizontal adjusting rod 10 can be controlled manually or electrically to move left and right in the horizontal direction.

[0028] Preferably, the rotation angles of the vertical connecting rod 21 and the cam 23 are between 0 degrees and 90 degrees.

[0029] Preferably, the cam 23 is in a wheel shape with symmetric protrusions on its edge.

[0030] Preferably, the slider 22 is a flat cuboid, and its inner end has an upward protrusion.

[0031] Preferably, the outer end of the top plate 25 extends downward to form a protrusion, and an elastic member 24 is provided between the protrusion and the upward protrusion at the inner end of the slider 22.

[0032] Preferably, the elastic member 24 is a spring.

[0033] As Figures 4 to 7As shown, the present invention can manually or automatically adjust the width of the horizontal opening between the blocking units 20 of the blocking mechanism 30 through the following operating mode. Specifically: in the height direction of the blocking mechanism 30, from its top particle dropping opening 5 to the bottom, as the particles descend and flow, the particles spread around between the layers of the heat absorber 100. By manually or electrically controlling the above-mentioned horizontal adjusting rod 10 of each layer, moving horizontally to the right, it synchronously drives each of the above-mentioned vertical connecting rods 21 of the multiple above-mentioned blocking units 20 movably connected thereto to rotate clockwise synchronously at the connection, and at the same time drives the above-mentioned cam 23 movably connected to the lower end of the above-mentioned vertical connecting rod 21 to rotate clockwise synchronously at the connection, so that the protruding part of the above-mentioned cam 23 pushes the above-mentioned sliders 22 located on both sides of it outwards synchronously, thereby reducing the gap distance between the blocking units 20 of each above-mentioned blocking mechanism 30, and the above-mentioned elastic components 24 connected to each above-mentioned slider 22 are compressed and shortened. After that, by controlling the horizontal adjusting rod 10 to move horizontally in the reverse direction to return it to its original position, it simultaneously drives each of the above-mentioned vertical connecting rods 21 of the multiple above-mentioned blocking units 20 movably connected thereto to rotate counterclockwise synchronously at the connection to return to the vertical direction, and at the same time drives the above-mentioned cam 23 movably connected to the lower end of the above-mentioned vertical connecting rod 21 to rotate counterclockwise synchronously at the connection so that the protruding part returns to be distributed vertically up and down. In addition, the above-mentioned elastic components 24 are simultaneously reset inward, pushing the sliders 22 on both sides to return inwardly with it, thereby restoring the gap distance between the blocking units 20 of each above-mentioned blocking mechanism 30. Thus, the adjustability of the blocking mechanism is achieved, so that the falling path space of the particles can be adjusted, and the residence time and heating temperature of the particles inside the heat absorber can be controlled. To enhance the blocking effect, the length of the blocking units 20 of each group of blocking mechanisms 30 (i.e., the distance between AB as shown in Figure 6 can be gradually increased from top to bottom.

[0034] As described above, the blocking system of the particle-drop solar heat absorber of the present invention realizes the regulation of the residence time and heating temperature of the particles inside the heat absorber according to the change of solar illumination. Moreover, the system has the characteristics of low cost, simple structure, easy operation and easy control. Thus, the economic value is maximally improved.

Claims

1. A particle falling solar thermal absorber barrier system, which is arranged inside the absorber (100) and is characterized in that: It comprises a plurality of blocking mechanisms (30) arranged staggered from top to bottom; The blocking mechanism (30) comprises a horizontal adjustment rod (10) and a plurality of blocking units (20) arranged along the horizontal extension direction thereof and movably connected thereto; The blocking unit (20) comprises a vertical connecting rod (21), a slider (22), a cam (23), an elastic component (24), a top plate (25) and a bottom plate (26); The upper end of the vertical connecting rod (21) is movably connected to the horizontal adjustment rod (10), and the lower end of the vertical connecting rod (21) is movably connected to the cam (23); the left and right sides of the edge of the cam (23) are respectively fitted with the sliders (22); the upper and lower sides of the slider (22) are respectively slidably fitted with the inner side portions of the top plate (25) and the bottom plate (26); and the elastic component (24) is fixed between the inner end of the slider (22) and the outer end of the top plate (25).

2. The particle falling solar thermal absorber barrier system according to claim 1, characterized in that: The lengths of the blocking units (20) in each group of the blocking mechanisms (30) distributed from top to bottom gradually increase.

3. The particle falling solar thermal absorber barrier system according to claim 1, characterized in that: The horizontal spacing between the plurality of blocking units (20) arranged on the horizontal adjustment rod (10) is equal.

4. The particle falling solar thermal absorber barrier system according to claim 1, characterized in that: The horizontal adjustment rod (10) can be manually or electrically controlled to move left and right in the horizontal direction.

5. The particle falling solar thermal absorber barrier system according to claim 1, characterized in that: The rotation angle of the vertical connecting rod (21) and the cam (23) is between 0 degrees and 90 degrees.

6. The particle falling solar thermal absorber barrier system according to claim 1, characterized in that: The cam (23) is in the shape of a wheel with symmetrical protrusions on the edge.

7. The particle falling solar thermal absorber barrier system according to claim 1, characterized in that: The slider (22) is a flat rectangular parallelepiped, and an inner end thereof has an upward protrusion.

8. The particle falling solar thermal absorber barrier system according to claim 1, characterized in that: The outer end of the top plate (25) extends downward to form a protrusion, and the elastic component (24) is provided between the protrusion and the upward protrusion at the inner end of the slider (22).

9. The particle falling solar thermal absorber barrier system according to claim 1, characterized in that: The elastic component (24) is a spring.

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