CN113007911A

CN113007911A - Blocking system for particle falling solar heat absorber

Info

Publication number: CN113007911A
Application number: CN202110224997.9A
Authority: CN
Inventors: 李斌; 侯全辉; 李栋; 沈涵孜; 钟文英; 李惠民
Original assignee: North China Power Engineering Co Ltd of China Power Engineering Consulting Group
Current assignee: North China Power Engineering Co Ltd of China Power Engineering Consulting Group; North China Power Engineering Beijing Co Ltd
Priority date: 2021-03-01
Filing date: 2021-03-01
Publication date: 2021-06-22

Abstract

The blocking system for the particle falling solar heat absorber is arranged in the heat absorber and comprises a plurality of groups of blocking mechanisms which are arranged from top to bottom in a staggered manner, wherein each blocking mechanism comprises a horizontal adjusting rod and a plurality of blocking units which are arranged along the horizontal extending direction of the horizontal adjusting rod and movably connected with the horizontal adjusting rod, and each blocking unit comprises a vertical connecting rod, a sliding block, a cam, an elastic part, a top plate and a bottom plate; the upper end of the vertical connecting rod is movably connected with the horizontal adjusting rod, the lower end of the vertical connecting rod is movably connected with the cam, and the left side and the right side of the edge of the cam are respectively attached with the sliding blocks; the upper side and the lower side of the sliding block are respectively in sliding fit with the inner parts of the top plate and the bottom plate; the elastic component is fixed between the inner end of the slide block and the outer end of the top plate. Therefore, the residence time and the heating temperature of the particles in the heat absorber can be adjusted and controlled according to the intensity of solar illumination.

Description

Blocking system for particle falling solar heat absorber

Technical Field

The invention relates to the technical field of solar tower type light gathering and heat generating, in particular to a blocking system of a solar heat absorber for falling particles.

Background

The solar tower type thermal power generation is that direct radiation of the sun is reflected and concentrated on a heat absorber arranged at a certain height through a heliostat, the heat absorber collects the heat of the solar energy, and transmits and sends the heat energy to a thermal energy storage device and a steam generator on the ground to generate steam and further drive a steam turbine to generate power. The heat absorption medium adopts particles, such as sand such as desert sand, the granularity is 200-600 microns, and the material cost of solar thermal power generation is reduced by utilizing the characteristics of high temperature resistance, corrosion resistance, wear resistance, low price and the like of the sand. The cost performance of the gravel is superior to that of tower-type thermal power generation which adopts other media such as molten salt (mixture of 60 percent of sodium nitrate and 40 percent of potassium nitrate) as heat absorption and storage media.

In a specific solar tower-type thermal power generation system with particles as heat absorbing media shown in fig. 1, sunlight 3 reflected by a heliostat 4 is converged on a heat absorber 100, then a particle falling port 5 at the top of the heat absorber 100 is opened, the particles fall, the temperature of the falling particles after absorbing solar energy can be increased to above 700 ℃, the intensity of solar illumination is constantly changed in a day, and therefore the falling flow rate and the falling process of the particles also need to be continuously adjusted, and the flow rate is controlled according to the intensity of the solar illumination. However, the existing particle-falling heat absorber has only a free-falling type (unobstructed type) and a simple obstruction type heat absorber, such as an inverted V-shaped baffle 17 arranged inside the heat absorber 100 as a mechanism for blocking the falling of particles as shown in fig. 2, and a hexagonal baffle 19 arranged inside the heat absorber 100 as a mechanism for blocking the falling of particles as shown in fig. 3. It is obvious that the above-mentioned prior blocking mechanism has the following disadvantages: all belong to static parts, can't initiatively adjust the process that the whereabouts of granule flowed, can't realize accurate regulation and control of granule temperature to can't set for the granule flow according to the change of solar illumination and reach the optimal heat absorption effect.

Aiming at the defects of the existing heat absorber blocking system, an innovative blocking system for the particle falling solar heat absorber is needed, the residence time and the heating temperature of the particles in the heat absorber can be controlled according to the intensity condition of solar illumination, so that the heat energy can be flexibly transmitted and stored according to the requirement, the energy is saved, the environment is protected, and the economic value is improved.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, a primary object of the present invention is to provide a system for preventing particles from falling down from a solar heat absorber, which controls the residence time and heating temperature of the particles in the heat absorber by controlling the flow rate of the particles.

The technical means adopted by the invention are as follows.

The blocking system of the solar heat absorber for falling particles is arranged inside the heat absorber and is characterized by comprising a plurality of groups of blocking mechanisms which are arranged in a staggered mode from top to bottom. Wherein, the blocking mechanism comprises a horizontal adjusting rod and a plurality of blocking units which are arranged along the horizontal extending direction and movably connected with the horizontal adjusting rod. Wherein, this block unit contains vertical connecting rod, slider, cam, elastomeric element, roof and bottom plate. The upper end of the vertical connecting rod is movably connected with the horizontal adjusting rod, the lower end of the vertical connecting rod is movably connected with the cam, the left side and the right side of the edge of the cam are respectively attached with the sliding blocks, the upper side and the lower side of the sliding blocks are respectively attached with the inner portions of the top plate and the bottom plate in a sliding mode, and the elastic component is fixed between the inner end of the sliding block and the outer end of the top plate.

Further, the length of the blocking unit in each group of the blocking mechanisms distributed from top to bottom is gradually increased.

Further, the horizontal spacing of the plurality of blocking units arranged on the horizontal adjusting rod is equal.

Further, the horizontal adjusting rod can be controlled to move left and right along the horizontal direction manually or electrically.

Further, the rotation angle of the vertical connecting rod and the cam is between 0 degree and 90 degrees.

Further, the cam is wheel-shaped with symmetrical bulges at the edge.

Further, the slider is a flat rectangular parallelepiped, and an inner end thereof has an upward projecting portion.

Furthermore, the outer end of the top plate extends downwards to form a protruding part, and the elastic part is arranged between the protruding part and the upward protruding part at the inner end of the sliding block.

Further, the elastic component is a spring.

The invention has the beneficial effects that: the innovation provides a hindrance system of granule whereabouts solar energy heat absorber, adopts cam mechanism to drive the slider motion, and then adjusts blocking mechanism's horizontal open-ended width for the path space of granule whereabouts has adjustable function, thereby realizes can adjusting and control the dwell time and the heating temperature of granule in the heat absorber inside according to the sunlight illumination change. Moreover, the system has the characteristics of low manufacturing cost, simple structure, easy operation and easy control. Thereby improving the economic value to the maximum extent.

Drawings

Fig. 1 is a schematic structural diagram of a conventional solar tower-type thermal power generation system in which a heat absorbing medium is particles.

Fig. 2 is a schematic view of the internal structure of a conventional inverted V-shaped barrier heat absorber.

Fig. 3 is a schematic diagram of the internal structure of a prior art hexagonal block obstructing a heat sink.

Fig. 4 is a schematic view of the overall arrangement of the present invention within the interior of a heat sink.

Fig. 5 is a schematic structural view of the obstructing unit of the present invention.

Fig. 6 is an expanded view of the slider of the hindrance unit of the present invention.

FIG. 7 is a schematic diagram comparing changes in the adjustment state of the interference mechanism of the present invention.

Detailed Description

As shown in fig. 4 and 5, the blocking system for a particle-fall solar heat absorber according to the present invention is disposed inside the heat absorber 100, and includes a plurality of blocking mechanisms 30 arranged in a staggered manner from top to bottom. The blocking mechanism 30 includes a horizontal adjustment rod 10 and a plurality of blocking units 20 arranged along the horizontal extending direction and movably connected with the horizontal adjustment rod. The 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 vertical connecting rod 21 is movably connected with the horizontal adjusting rod 10, and the lower end of the vertical connecting rod 21 is movably connected with the cam 23. The sliders 22 are respectively attached to the left and right sides of the edge of the cam 23. The upper and lower sides of the slider 22 are slidably attached to the inner portions of the top plate 25 and the bottom plate 26, respectively. The elastic member 24 is fixed between an inner end of the slider 22 and an outer end of the top plate 25.

Preferably, the length of the blocking unit 20 in each of the sets of the blocking mechanisms 30 distributed from top to bottom is gradually increased.

Preferably, the horizontal pitches of the plurality of the blocking units 20 arranged on the horizontal adjustment lever 10 are equal.

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

Preferably, the rotation angle of the vertical connecting rod 21 and the cam 23 is between 0 degree and 90 degrees.

Preferably, the cam 23 is wheel-shaped with symmetrical protrusions on the edge.

Preferably, the slider 22 is a flat rectangular parallelepiped, and has an upward protruding portion at its inner end.

Preferably, the outer end of the top plate 25 extends downward to form a protrusion, and the elastic member 24 is disposed between the protrusion and the upward protrusion of the inner end of the slider 22.

Preferably, the elastic member 24 is a spring.

As shown in fig. 4 to 7, the present invention can achieve manual or automatic adjustment of the width of the horizontal opening between the barrier units 20 of the barrier mechanism 30 by the following operation. The method specifically comprises the following steps: in the height direction of the heat absorber 30, from the top particle falling port 5 to the bottom, particles are diffused all around between the layers of the blocking mechanism 100 as the particles flow downward, and the horizontal movement rightward by manually or electrically controlling the horizontal adjusting rod 10 of each layer synchronously drives the vertical connecting rods 21 of the blocking units 20 movably connected therewith to synchronously rotate clockwise along the joints, and simultaneously drives the cams 23 movably connected with the lower ends of the vertical connecting rods 21 to synchronously rotate clockwise along the joints, so that the protruding parts of the cams 23 synchronously eject the sliders 22 positioned on both sides of the protruding parts outwards, thereby reducing the gap distance between the blocking units 20 of the blocking mechanisms 30, and the elastic members 24 connected with the sliders 22 are compressed and shortened. Then, the horizontal adjusting rod 10 is controlled to move horizontally and reversely to return to the original position, and simultaneously drives each vertical connecting rod 21 of the plurality of blocking units 20 movably connected with the horizontal adjusting rod to synchronously rotate anticlockwise to return to the vertical direction along the joint, and simultaneously drives the cam 23 movably connected with the lower end of the vertical connecting rod 21 to synchronously rotate anticlockwise along the joint to ensure that the convex part returns to the original position vertically and vertically distributed, and in addition, the elastic part 24 simultaneously returns inwards to push the sliding blocks 21 at two sides to return inwards along with the sliding blocks, so that the gap distance between the blocking units 20 of each blocking mechanism 30 is recovered. Therefore, the blocking mechanism can be adjusted, the falling path space of the particles can be adjusted, and the residence time and the heating temperature of the particles in the heat absorber can be controlled. To enhance the blocking effect, the length of the blocking unit 20 (i.e. the distance between AB as shown in fig. 6) of each set of the blocking mechanism 30 may be gradually increased from top to bottom.

As described above, the blocking system for a solar heat absorber allowing particles to fall according to the present invention can control the residence time and heating temperature of particles in the heat absorber according to the change of solar illumination. Moreover, the system has the characteristics of low manufacturing cost, simple structure, easy operation and easy control. Thereby improving the economic value to the maximum extent.

Claims

1. The blocking system of the solar heat absorber for falling particles is arranged inside the heat absorber (100), and is characterized by comprising a plurality of groups of blocking mechanisms (30) which are arranged from top to bottom in a staggered manner;

wherein, the blocking mechanism (30) comprises a horizontal adjusting rod (10) and a plurality of blocking units (20) which are arranged along the horizontal extending direction and movably connected with the horizontal adjusting rod;

wherein 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 with the horizontal adjusting rod (10), and the lower end of the vertical connecting rod (21) is movably connected with the cam (23); the left side and the right side of the edge of the cam (23) are respectively attached with the sliding blocks (22); the upper side and the lower side of the sliding block (22) are respectively in sliding fit with the inner parts of the top plate (25) and the bottom plate (26); the elastic component (24) is fixed between the inner end of the sliding block (22) and the outer end of the top plate (25).

2. The particle-fall solar thermal absorber obstruction system of claim 1, wherein: the length of the blocking unit (20) in each group of the blocking mechanisms (30) distributed from top to bottom is gradually increased.

3. The particle-fall solar thermal absorber obstruction system of claim 1, wherein: the horizontal spacing of the plurality of blocking units (20) arranged on the horizontal adjusting rod (10) is equal.

4. The particle-fall solar thermal absorber obstruction system of claim 1, wherein: the horizontal adjusting rod (10) can be controlled to move left and right along the horizontal direction through manual or electric control.

5. The particle tolerant falling solar thermal absorber obstruction system of claim 1, wherein: the rotating angles of the vertical connecting rod (21) and the cam (23) are 0-90 degrees.

6. The particle-fall solar thermal absorber obstruction system of claim 1, wherein: the cam (23) is wheel-shaped with symmetrical bulges at the edge.

7. The particle-fall solar thermal absorber obstruction system of claim 1, wherein: the slider (22) is a flat rectangular parallelepiped, and an upward projecting portion is provided at an inner end thereof.

8. The particle-fall solar thermal absorber obstruction system of claim 1, wherein: the outer end of the top plate (25) extends downwards to form a protruding part, and the elastic part (24) is arranged between the protruding part and the upward protruding part at the inner end of the sliding block (22).

9. The particle-fall solar thermal absorber obstruction system of claim 1, wherein: the elastic component (24) is a spring.