Solid particle heat collection device based on secondary reflection condensation technology

Abstract

The invention relates to a solid particle heat collection device, in particular to a solid particle heat collection device based on a secondary reflection condensation technology. The problem that in the prior art, solid particles are heated unevenly and insufficiently or escape is solved. The system comprises a condensation unit, a particle heat collection unit and a particle storage unit. The light condensation unit comprises a light condensation array and a reflection tower, and the light condensation array reflects solar rays to the reflection tower. The particle storage unit comprises a high-temperature storage bin and a low-temperature storage bin, and solid particles in the high-temperature storage bin are conveyed to the low-temperature storage bin through a conveying belt. By adjusting the feeding speed, the heating time of the solid particles is guaranteed, and therefore it is guaranteed that the particles are fully heated; meanwhile, the solid particles freely slide down after being stacked in the particle heat absorption box by controlling the feeding speed, the escape rate of the solid particles can be greatly reduced, and the reliability of the heat collection technology is improved. The invention belongs to the technical field of solar photo-thermal power generation and solid particle heat collection equipment.

Description

Technical Field

[0001] The present invention relates to a solid particle heat collection device, in particular to a solid particle heat collection device based on secondary reflection focusing technology, belonging to the technical field of solar thermal power generation and solid particle heat collection equipment. Background Art

[0002] As a new solar power generation method, solar thermal power generation technology has the advantages of stable power output and no carbon dioxide and other pollutants produced during the power generation process. It is becoming more and more popular in the new energy market. Supercritical CO2 solar thermal power generation technology has high system efficiency, improves the economic efficiency of solar thermal projects, has high application prospects, and is also known as the third generation of solar thermal power generation technology.

[0003] As an important technical branch of supercritical CO2 solar thermal power generation technology, particle heat collection technology allows solid particles to directly receive radiation, which can improve heat transfer efficiency. At present, the mainstream heat collection method is mostly for particles to slowly pour down from the top of the collector like a waterfall. However, due to factors such as weather and residence time, uneven heating, insufficient heating, or particle escape during the falling process (blown away by the wind) often occur.

[0004] In summary, how to propose a new solid particle heat collection device to address the above technical problems has become an urgent problem to be solved by technicians in this field. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a solid particle heat collection device based on secondary reflection focusing technology.

[0006] The technical solution of the present invention is: a solid particle heat collection device based on secondary reflection focusing technology, comprising a focusing unit, a particle heat collection unit and a particle storage unit.

[0007] The light-concentrating unit includes a light-concentrating array and a reflection tower; the light-concentrating array reflects sunlight to the reflection tower.

[0008] The particle storage unit includes a high-temperature storage bin and a low-temperature storage bin. The solid particles in the high-temperature storage bin are transported to the low-temperature storage bin via a conveyor belt.

[0009] The particle heat collection unit includes a particle heat absorption box and a screw conveyor.

[0010] The particle heat absorption box is arranged below the reflective dome of the reflective tower. An annular discharge trough is provided on the bottom plate of the particle heat absorption box. The annular discharge trough is connected with the high-temperature storage bin through a high-temperature particle feeder.

[0011] The screw conveyor is arranged vertically to the horizontal plane and is coaxially installed below the particle heat absorption box. The feed end of the screw conveyor is connected to the low-temperature storage bin through the low-temperature particle feeder, and the discharge end of the screw conveyor is connected to the particle heat absorption box.

[0012] Or the particle heat collection unit includes a particle heat absorption box, a drop pipe and several groups of external feeders.

[0013] The particle heat absorption box is arranged below the reflection dome of the reflection tower, the drop pipe is arranged vertically to the horizontal plane, and the drop pipe is coaxially installed below the particle heat absorption box, and the drop pipe is connected to the high-temperature storage bin through the high-temperature particle feeder.

[0014] Several groups of external feeders are arranged at equal angles in the circumferential direction of the particle heat absorption box. The feeding end of the external feeder is connected to the low-temperature storage bin through the low-temperature particle conveyor; the discharging end of the external feeder is connected to the particle heat absorption box.

[0015] Compared with the prior art, the present invention has the following effects:

[0016] In the present invention, the feeding speed is adjusted to control the free falling time of the solid particles after being accumulated in the particle heat absorption box 210, thereby ensuring that the particles are fully and evenly heated; at the same time, the solid particles are free to fall after being accumulated in the particle heat absorption box 210, and the height of the side wall of the heat absorption box 210 is reasonably increased, thereby reducing the escape rate of the solid particles and improving the reliability of the heat collection technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 is a first schematic diagram of a particle heat collection unit 200 and a particle storage unit 300 of the present invention;

[0019] Figure 3 It is a second schematic diagram of the particle heat collection unit 200 and the particle storage unit 300 of the present invention.

[0020] In the figure:

[0021] 100, focusing unit; 110, focusing array; 120, reflecting tower;

[0022] 200, particle heat collection unit; 210, particle heat absorption box; 220, annular discharge trough; 221, screw conveyor; 222, thermometer; 230, external feeder; 231, drop pipe;

[0023] 300, particle storage unit; 310, low-temperature storage bin; 311, low-temperature particle feeder; 320, high-temperature storage bin; 321, high-temperature particle feeder. DETAILED DESCRIPTION

[0024] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0025] Specific implementation method 1: Combination Figures 1 to 3 The present embodiment is described below. A solid particle heat collection device based on secondary reflection focusing technology in the present embodiment includes a focusing unit 100 , a particle heat collection unit 200 and a particle storage unit 300 .

[0026] The light concentrating unit 100 includes a light concentrating array 110 and a reflection tower 120 ; the light concentrating array 110 reflects sunlight to the reflection tower 120 .

[0027] The particle storage unit 300 includes a high-temperature storage bin 320 and a low-temperature storage bin 310 . The solid particles in the high-temperature storage bin 320 are transported to the low-temperature storage bin 310 through a conveyor belt after heat exchange.

[0028] like Figure 2 As shown, the particle heat collection unit 200 includes a particle heat absorption box 210 and a screw conveyor 221.

[0029] The particle heat absorption box 210 is arranged under the reflective dome of the reflective tower 120 . An annular discharge trough 220 is opened on the bottom plate of the particle heat absorption box 210 . The annular discharge trough 220 is connected to the high-temperature storage bin 320 through a high-temperature particle feeder 321 .

[0030] The screw conveyor 221 is arranged vertically to the horizontal plane, and the screw conveyor 221 is coaxially installed below the particle heat absorption box 210. The feeding end of the screw conveyor 221 is connected to the low-temperature storage bin 310 through the low-temperature particle feeder 311, and the discharging end of the screw conveyor 221 is connected to the particle heat absorption box 210. In this arrangement, the solid particles are transported to the center of the particle heat absorption box 210, and a particle pile is formed in the particle heat absorption box 210. After absorbing heat, the solid particles on the surface flow from the center of the particle heat absorption box 210 to the surroundings until they enter the annular discharge trough 220, and then are transported to the high-temperature storage bin 320 through the high-temperature particle feeder 321.

[0031] or Figure 3 As shown, the particle heat collection unit 200 includes a particle heat absorption box 210 , a drop pipe 231 and several groups of external feeders 230 .

[0032] The particle heat absorption box 210 is arranged under the reflective dome of the reflective tower 120, the drop pipe 231 is arranged vertically to the horizontal plane, and the drop pipe 231 is coaxially installed under the particle heat absorption box 210, and the drop pipe 231 is connected to the high-temperature storage bin 320 through the high-temperature particle feeder 321.

[0033] Several groups of external feeders 230 are arranged at equal angles in the circumferential direction of the particle heat absorption box 210. The feed end of the external feeder 230 is connected to the low-temperature storage bin 310 through the low-temperature particle feeder 311; the discharge end of the external feeder 230 is connected to the particle heat absorption box 210. In this arrangement, solid particles enter the particle heat absorption box 210 from the circumference of the particle heat absorption box 210 and form a particle pile in the particle heat absorption box 210. After absorbing heat, the solid particles on the surface flow downward from the center of the particle heat absorption box 210 into the drop pipe 231, and then are transported to the high-temperature storage bin 320 through the high-temperature particle feeder 321.

[0034] In this embodiment, in order to reduce the escape rate of solid particles, the height of the side wall of the particle heat absorption box 210 is at least twice the height of the solid particle pile.

[0035] In this embodiment, the focusing array 110 includes a plurality of reflectors arranged in an array, and the reflectors reflect sunlight to the reflection tower 120 .

[0036] Specific implementation method 2: Combination Figures 1 to 3 To explain this embodiment, a thermometer 222 is installed on the annular discharge chute 220. With this arrangement, the thermometer 222 can detect the temperature of the solid particles. When the temperature of the solid particles is high, the feeding speed of the screw conveyor 221 is increased. When the temperature of the solid particles is low, the feeding speed of the screw conveyor 221 is reduced.

[0037] Other components and connection relationships are the same as those in the first specific implementation method.

[0038] Specific implementation method three: Combination Figures 1 to 3 To explain this embodiment, in this embodiment, the outer surface of the high-temperature particle feeder 321 is wrapped with high-temperature resistant heat-insulating cotton, and the inner surface of the high-temperature particle feeder 321 is coated with a wear-resistant coating.

[0039] Furthermore, the outer surface of the external feeder 230 is wrapped with high temperature resistant heat insulating cotton, and the inner surface of the external feeder 230 is coated with a wear-resistant coating.

[0040] The other components and connection relationships are the same as those in the first or second specific implementation.

[0041] Specific implementation method four: Combination Figures 1 to 3 To explain this embodiment, in this embodiment, the high-temperature particle feeder 321 and the low-temperature particle feeder 311 are both augers.

[0042] Further, the external feeder 230 is a belt conveyor, a bucket elevator or a plate chain elevator.

[0043] Furthermore, the number of groups of the external feeders 230 is not less than 3 groups.

[0044] The other components and connection relationships are the same as those of the first, second or third specific implementation modes.

[0045] How it works

[0046] Combination Figures 1 to 3 The working principle of the present invention is described:

[0047] The focusing array 110 reflects the sunlight to the reflection tower 120 , and the reflection tower 120 heats the solid particles in the particle heat absorption box 210 .

[0048] When the central feeding scheme is adopted, the solid particles are transported to the center of the particle heat absorption box 210 and form a particle pile in the particle heat absorption box 210. After absorbing heat, the solid particles on the surface flow from the center of the particle heat absorption box 210 to the surroundings until they enter the annular discharge trough 220, and are then transported to the high-temperature storage bin 320 through the high-temperature particle feeder 321.

[0049] When the circumferential feeding scheme is adopted, solid particles enter the particle heat absorption box 210 from the circumference of the particle heat absorption box 210 and form a particle pile in the particle heat absorption box 210. After absorbing heat, the solid particles on the surface flow downward from the center of the particle heat absorption box 210 into the drop pipe 231, and are then transported to the high-temperature storage bin 320 through the high-temperature particle feeder 321.

[0050] The solid particles in the high-temperature storage bin 320 are transported to the low-temperature storage bin 310 after heat exchange, and this process is repeated to achieve the recycling of the solid particles.

[0051] The present invention has been disclosed as above in the form of a preferred embodiment, but it is not intended to limit the present invention. Any simple modification, equivalent changes and modifications made to the above implementation cases by any professional and technical personnel who do not deviate from the content of the technical solution of the present invention and based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A solid particle heat collection device based on secondary reflection focusing technology, characterized in that: It comprises a light collecting unit (100), a particle heat collecting unit (200) and a particle storage unit (300); The light-concentrating unit (100) comprises a light-concentrating array (110) and a reflection tower (120); the light-concentrating array (110) reflects sunlight to the reflection tower (120); The particle storage unit (300) comprises a high-temperature storage bin (320) and a low-temperature storage bin (310), and the solid particles in the high-temperature storage bin (320) are transported to the low-temperature storage bin (310) via a conveyor belt; The particle heat collection unit (200) comprises a particle heat absorption box (210) and a screw conveyor (221); The particle heat absorption box (210) is arranged below the reflective dome of the reflective tower (120), and an annular discharge trough (220) is provided on the bottom plate of the particle heat absorption box (210), and the annular discharge trough (220) is connected to the high-temperature storage bin (320) through a high-temperature particle feeder (321); The screw conveyor (221) is arranged perpendicular to the horizontal plane, and the screw conveyor (221) is coaxially installed below the particle heat absorption box (210). The feeding end of the screw conveyor (221) is connected to the low-temperature storage bin (310) through the low-temperature particle feeder (311), and the discharging end of the screw conveyor (221) is connected to the particle heat absorption box (210); Or the particle heat collection unit (200) includes a particle heat absorption box (210), a drop pipe (231) and a plurality of groups of external feeders (230); The particle heat absorption box (210) is arranged below the reflective dome of the reflective tower (120), the drop pipe (231) is arranged perpendicular to the horizontal plane, and the drop pipe (231) is coaxially installed below the particle heat absorption box (210), and the drop pipe (231) is connected to the high-temperature storage bin (320) through the high-temperature particle feeder (321); A plurality of groups of external feeders (230) are arranged at equal angles in the circumferential direction of the particle heat absorption box (210); the feeding end of the external feeder (230) is connected to the low-temperature storage bin (310) through the low-temperature particle conveyor (311); and the discharging end of the external feeder (230) is connected to the particle heat absorption box (210).

2. According to claim 1, a solid particle heat collection device based on secondary reflection focusing technology is characterized by: A temperature meter (222) is installed on the annular discharge trough (220).

3. According to claim 2, a solid particle heat collection device based on secondary reflection focusing technology is characterized in that: The high-temperature particle feeder (321) and the low-temperature particle feeder (311) are both augers.

4. According to claim 3, a solid particle heat collection device based on secondary reflection focusing technology is characterized in that: The outer surface of the high-temperature particle feeder (321) is wrapped with high-temperature resistant heat-insulating cotton, and the inner surface of the high-temperature particle feeder (321) is coated with a wear-resistant coating.

5. The solid particle heat collection device based on secondary reflection focusing technology according to claim 4 is characterized in that: The external feeder (230) is a belt conveyor, a bucket elevator or a plate chain elevator.

6. The solid particle heat collection device based on secondary reflection focusing technology according to claim 5 is characterized by: The outer surface of the external feeder (230) is wrapped with high temperature resistant heat insulation cotton, and the inner surface of the external feeder (230) is coated with a wear-resistant coating.

7. The solid particle heat collection device based on secondary reflection focusing technology according to claim 6 is characterized by: The number of groups of the external feeders (230) is no less than 3.

Images