Heat absorber heat preservation structure for solar photo-thermal power station

Abstract

The invention relates to a heat absorber heat preservation structure for a solar photo-thermal power station, the heat absorber heat preservation structure comprises a first heat preservation block, a flexible heat preservation assembly and a second heat preservation block, one end, close to a heat absorption pipe, of the flexible heat preservation assembly is provided with a brush, and the brush is of a flexible structure and has a certain change along with the shape of the heat absorption pipe; therefore, the heat-insulating structure can be tightly attached to the heat-absorbing pipe, large gaps caused by machining errors are avoided, the gaps between the heat-absorbing pipe and the heat-insulating structure are effectively reduced, and the heat-insulating effect of the heat absorber header is not affected by the gaps increased in the up-down moving process of the heat-absorbing pipe. Meanwhile, the friction force of contact between the brush and the heat absorption pipe is small, and free expansion and shrinkage of the heat absorption pipe are not affected when the heat absorber works. The second heat preservation block and the first heat preservation block clamp the flexible heat preservation assembly, the heat preservation effect of the heat absorber header is guaranteed, meanwhile, the flexible heat preservation assembly is fixed, and the problem that the flexible heat preservation assembly deforms and moves in the vertical moving process of the heat absorption pipe is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of solar thermal power plants, and in particular to a heat absorber insulation structure used in solar thermal power plants. Background Art

[0002] With the rapid development of the global economy and the accelerated industrialization process in recent years, the environmental and resource problems caused by the use of traditional energy sources have become increasingly serious. As an environmentally friendly energy source, solar energy has the advantages of wide distribution, easy access, low cost, and unlimited reserves, which has brought solutions to global energy problems. Solar thermal power stations have the advantages of stable power supply, high efficiency, and grid friendliness, and are an important direction for solar power generation. Solar thermal power stations mainly include mirror fields and absorbers. The mirror field projects sunlight onto the tube screen of the absorber, and the tube screen converts solar energy into thermal energy, and then converts thermal energy into electrical energy through the heat storage system, heat exchange system, and power generation equipment.

[0003] The existing solar thermal absorber used in solar tower thermal power plants is mainly composed of tube panels and their connecting pipes. Figure 1 The tube panel is composed of an upper header 12, a plurality of heat absorbing tubes 1, a lower header 13 and a tube clamp, etc. The upper ends of the plurality of heat absorbing tubes 1 are connected to the upper header 12, and the lower ends of the plurality of heat absorbing tubes 1 are connected to the lower header 13. The outer peripheries of the upper header 12 and the lower header 13 are provided with a header insulation device 14, and the backlight side of the plurality of heat absorbing tubes 1 is provided with a tube panel back insulation device 15. The existing heat absorber insulation structure has defects and shortcomings in that there is a gap at the connection between the header insulation device 14 and the heat absorbing tube 1, which cannot be completely sealed. Specifically, since the gaps between the heat absorbing tubes 1 are uneven in size, and the header insulation device 14 also has a certain amount of deformation during transportation and use, it cannot be guaranteed that the header insulation device 14 is always in close contact with the heat absorbing tube 1. This results in a large gap between the header insulation device 14 and the heat absorbing tube 1. When encountering severe weather such as strong winds and severe cold, it will cause a large amount of heat dissipation inside the header of the heat absorber, making it difficult to reach the set temperature.

[0004] Therefore, there is an urgent need to provide a heat absorber insulation structure for a solar thermal power station that is windproof and has low heat dissipation. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an absorber insulation structure for a solar thermal power station, which solves the technical problem in the prior art that the sealing effect of the header insulation structure and the heat absorption pipe connection is not ideal, resulting in large heat dissipation of the absorber header.

[0007] (II) Technical solution

[0008] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0009] An embodiment of the present invention provides a heat absorber insulation structure for a solar thermal power station, comprising a flexible insulation component and a first insulation block;

[0010] The flexible insulation component and the first insulation block are both made of high-temperature resistant insulation materials and are arranged at the connection between the header insulation device of the heat absorber and the heat absorption tube. The first insulation block is arranged on the side of the flexible insulation component close to the header of the heat absorber, and a brush is arranged on the end of the flexible insulation component close to the heat absorption tube, and the brush is in contact with the heat absorption tube.

[0011] Optionally, it also includes a second insulation block made of high temperature resistant insulation material, and the second insulation block is arranged on a side of the flexible insulation component away from the header of the heat absorber.

[0012] Optionally, it also includes a second insulation block made of high-temperature resistant insulation material, and the second insulation block is arranged between the flexible insulation component and the first insulation block.

[0013] Optionally, the flexible thermal insulation assembly includes a flexible thermal insulation member and two stainless steel plates;

[0014] The two stainless steel plates are respectively located on the upper surface and the lower surface of the flexible heat-insulating member, and the two stainless steel plates and the flexible heat-insulating member are fixed by perforating a plurality of first fasteners. A brush is formed at one end of the flexible heat-insulating member close to the heat-absorbing tube, and the diameter of a single bristle of the brush is 0.01-5 mm.

[0015] The flexible thermal insulation member is high-silica cloth, high-temperature resistant fiber paper, high-temperature resistant fiber cloth or aerogel.

[0016] Optionally, it further comprises a plurality of second fasteners, and the second insulation block, the flexible insulation assembly and the first insulation block are fixedly connected together by the plurality of second fasteners;

[0017] The first fastener and the second fastener are a bolt and a nut;

[0018] The second heat-insulating block and the first heat-insulating block are provided with grooves corresponding to the first fastener installation area to accommodate the head of the first fastener.

[0019] Optionally, a side of the second insulation block facing away from the flexible insulation component is a light-receiving surface, and a high-temperature resistant reflective coating is sprayed on the light-receiving surface of the second insulation block.

[0020] Optionally, a groove on one side of the second insulation block facing the heat absorbing tube is embedded with electric heating, and the electric heating is fixed to the second insulation block by a high-temperature resistant steel wire.

[0021] Optionally, the second insulation block and the first insulation block are made of aluminum silicate insulation block, aluminum silicate insulation wool, ceramic fiber and / or aerogel insulation material.

[0022] Optionally, the thickness of the second insulation block is 10-200 mm, the thickness of the flexible insulation component is 5-100 mm, and the thickness of the first insulation block is 10-300 mm.

[0023] Optionally, a comb-tooth portion is provided at one end of the first heat-insulating block close to the heat-absorbing tube, and the comb-tooth portion abuts against the heat-absorbing tube.

[0024] (III) Beneficial effects

[0025] The beneficial effects of the present invention are as follows: the absorber insulation structure for solar thermal power station of the present invention includes a flexible insulation component and a first insulation block; the flexible insulation component and the first insulation block are both made of high temperature resistant insulation materials and are arranged at the connection between the header insulation device of the absorber and the absorber tube, the first insulation block is arranged on the side of the flexible insulation component close to the header of the absorber, and a brush is arranged on the end of the flexible insulation component close to the absorber tube, and the brush abuts against the absorber tube. Compared with the prior art, the flexible insulation component of the present invention belongs to a flexible structure, and the brush of the flexible insulation component can change to a certain extent with the shape of the absorber tube, so that it can fit closely with the absorber tube, and will not cause a large gap due to processing errors, which effectively reduces the gap between the absorber tube and the absorber insulation structure, and will not increase the gap in the process of the absorber tube moving up and down to affect the insulation effect of the absorber header insulation device. At the same time, the friction between the brush and the absorber tube is small, which will not affect the free expansion and contraction of the absorber tube when the absorber is working.

[0026] The absorber insulation structure of the present invention has a flexible insulation component including a flexible insulation part and two stainless steel plates. The brushes on the flexible insulation part are staggered with each other to further block the airflow, thereby ensuring a close fit between the brushes and the heat absorbing tubes, achieving a better sealing effect and reducing the impact of bad weather on the upper or lower header of the absorber.

[0027] The heat absorber insulation structure of the present invention adopts a second insulation block to cover the flexible insulation component, which can well fix the flexible insulation component while achieving the insulation effect, and prevent the flexible insulation component from shifting and deforming during long-term use. The second insulation block is grooved on the side facing the heat absorbing tube and embedded with electric heating, which can solve the light blind area problem of the heat absorbing tube caused by the insulation of the header. When the heat absorbing tube is blocked, the electric heating converts electrical energy into thermal energy, which plays a certain degree of salting effect. Adding a high-temperature resistant reflective coating layer on the side of the second insulation block away from the flexible insulation component can effectively improve the reflectivity of the insulation structure and reflect part of the light source onto the heat absorbing tube.

[0028] The first insulation block of the heat absorber insulation structure of the present invention also plays the role of insulation and fixing the flexible insulation component, and the comb tooth portion of the first insulation block is arranged close to one end of the heat absorption tube, and the comb tooth portion can fit tightly with the heat absorption tube, thereby reducing the gap between the insulation structure and the heat absorption tube of the heat absorption tube, which further ensures the insulation effect of the heat absorber's header insulation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the heat insulation structure of a single tube screen of a heat absorber used in a solar thermal power station in the prior art;

[0030] Figure 2 It is a front view schematic diagram of Embodiment 1 of the heat absorber insulation structure for a solar thermal power station of the present invention;

[0031] Figure 3 for Figure 2 A schematic diagram of a main view of a flexible thermal insulation component;

[0032] Figure 4 1 is a top view schematic diagram of the embodiment 1 of the heat absorber insulation structure for a solar thermal power station of the present invention when the second insulation block is removed;

[0033] Figure 5 This is a top view schematic diagram of Example 1 of the heat absorber insulation structure for a solar thermal power station of the present invention when the second insulation block and the flexible insulation component are removed;

[0034] Figure 6 It is a front view schematic diagram of Embodiment 2 of the heat absorber insulation structure for a solar thermal power station of the present invention.

[0035] [Description of Reference Numerals]

[0036] 1: heat absorbing tube; 2: second insulation block; 3: flexible insulation assembly; 4: first insulation block; 5: brush; 6: electric heating; 7: comb teeth; 8: flexible insulation component; 9: stainless steel plate; 10: first fastener; 11: second fastener; 12: upper header; 13: lower header; 14: header insulation device; 15: tube screen back insulation device. DETAILED DESCRIPTION

[0037] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0038] Embodiment 1:

[0039] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5This embodiment provides a heat absorber insulation structure for a solar thermal power station, including a second insulation block 2, a flexible insulation component 3 and a first insulation block 4.

[0040] The second insulation block 2, the flexible insulation component 3 and the first insulation block 4 are all made of high-temperature resistant insulation materials and are arranged at the connection between the header insulation device 14 of the heat absorber and the heat absorption tube 1. The second insulation block 2 is arranged on the side of the flexible insulation component 3 away from the header of the heat absorber, and the first insulation block 4 is arranged on the side of the flexible insulation component 3 close to the header of the heat absorber. A brush 5 is arranged on the end of the flexible insulation component 3 close to the heat absorption tube 1, and the brush 5 abuts against the heat absorption tube 1.

[0041] It should be noted that this embodiment only shows a state diagram in which the heat absorber insulation structure is arranged on the header insulation device 14 outside the lower header 13, that is, the second insulation block 2 is arranged above the flexible insulation component 3, and the first insulation block 4 is arranged below the flexible insulation component 3. Of course, the header insulation device 14 at the upper header 12 of the heat absorber can also be provided with the heat absorber insulation structure of this embodiment, but the positions of the second insulation block 2 and the first insulation block 4 need to be interchanged.

[0042] The heat absorber insulation structure of this embodiment adopts a flexible insulation component 3. A brush 5 is provided at one end of the flexible insulation component 3 close to the heat absorber tube 1. The brush 5 is a flexible structure and can change to a certain extent with the shape of the heat absorber tube 1. Therefore, it can fit tightly with the heat absorber tube and will not cause a large gap due to processing errors. This effectively reduces the gap between the heat absorber tube and the heat absorber insulation structure, and will not increase the gap to affect the insulation effect of the heat absorber header during the up and down movement of the heat absorber tube. At the same time, the friction between the brush 5 and the heat absorber tube 1 is small, which will not affect the free expansion and contraction of the heat absorber tube 1 when the heat absorber is working. In addition, the second insulation block 2 and the first insulation block 4 clamp the flexible insulation component 3, which plays a certain fixing role on the flexible insulation component 3 while ensuring the insulation effect of the heat absorber header, and effectively prevents the deformation and displacement of the flexible insulation component 3 during the up and down movement of the heat absorber tube.

[0043] In this embodiment, the side of the second insulation block 2 facing away from the flexible insulation component 3 is the light-receiving surface, and a high-temperature resistant reflective coating is sprayed on the light-receiving surface of the second insulation block 2. The purpose of spraying the high-temperature resistant reflective coating on the light-receiving surface of the second insulation block 2 is to effectively improve the reflectivity of the heat absorber insulation structure and reflect part of the light source onto the heat absorption tube.

[0044] Furthermore, the second heat-insulating block 2 has an electric heat trace 6 embedded in a groove on one side facing the heat-absorbing tube 1, and the electric heat trace 6 is fixed to the second heat-insulating block 2 by a high-temperature resistant steel wire (see Figure 2), this structure can increase the coverage area of ​​the electric heat tracing 6 on the heat absorbing tube, and reduce the blind area of ​​the heat absorbing tube 1 due to the angle problem of the heliostat. When the heat absorbing tube is blocked, the electric heat tracing 6 converts electrical energy into thermal energy, which plays a certain degree of salt-reducing role.

[0045] Please refer to Figure 2 and Figure 5 The first heat-insulating block 4 is provided with a comb-tooth portion 7 at one end close to the heat-absorbing tube 1, and the comb-tooth portion 7 abuts against the heat-absorbing tube 1. It should be noted that the shape of the comb-tooth portion 7 of the first heat-insulating block 4 corresponds to the shape of the heat-absorbing tube 1, so that the comb-tooth portion 7 can be closely fitted and contacted with the heat-absorbing tube 1, which can reduce the gap between the heat-absorbing tube 1 and the first heat-insulating block 4, and also prevent the brush 5 from moving downward to increase the gap.

[0046] In this embodiment, the second insulation block 2 and the first insulation block 4 are made of aluminum silicate insulation block, aluminum silicate insulation wool, ceramic fiber and / or aerogel insulation material.

[0047] See also Figure 3 The flexible heat-insulating assembly 3 of this embodiment includes a flexible heat-insulating member 8 and two stainless steel plates 9. The two stainless steel plates 9 are respectively located on the upper surface and the lower surface of the flexible heat-insulating member 8, and the two stainless steel plates 9 and the flexible heat-insulating member 8 are fixed by perforating multiple first fasteners 10. A brush 5 is formed at one end of the flexible heat-insulating member 8 close to the heat-absorbing tube 1, and the diameter of a single bristle of the brush 5 is 0.01-5 mm.

[0048] Furthermore, the flexible heat-insulating member 8 of this embodiment can be high-silica cloth, high-temperature resistant fiber paper, high-temperature resistant fiber cloth or aerogel. Preferably, the flexible heat-insulating member 8 is high-silica cloth, which can be folded into a multi-layer structure, which can ensure that the brushes are interlaced with each other to further block the airflow. At the same time, during installation, ensure that the brushes 5 and the heat-absorbing tube 1 have a certain degree of extrusion, such as Figure 2 As shown, such a structure can ensure that the brush 5 and the heat absorbing tube 1 are closely fitted, the sealing effect is better, and the influence of bad weather on the heat absorbing header insulation structure is further reduced. In addition, the flexible heat insulating member 8 of this embodiment is fixed by the first fastener 10 through the upper and lower stainless steel plates 9, so as to ensure that the flexible heat insulating member 8 is a whole and will not be deformed or fall apart.

[0049] In this embodiment, the heat absorber insulation structure further includes a plurality of second fasteners 11, and the second insulation block 2, the flexible insulation assembly 3 and the first insulation block 4 are fixedly connected together by the plurality of second fasteners 11. The second insulation block 2, the flexible insulation assembly 3 and the first insulation block 4 are fixedly connected together and then fixedly mounted on the frame structure of the heat absorber, which can ensure the integrity of the heat absorption header insulation.

[0050] In this embodiment, the first fastener 10 and the second fastener 11 are preferably bolts and nuts.

[0051] Furthermore, the second insulation block 2 and the first insulation block 4 are provided with grooves corresponding to the installation area of ​​the first fastener 10 to accommodate the head of the first fastener 10, so that the second insulation block 2 and the first insulation block 4 can fit tightly with the flexible insulation component 3 to clamp and fix the flexible insulation component 3.

[0052] Preferably, the thickness of the second insulation block 2 is 10-200 mm, the thickness of the flexible insulation component 3 is 5-100 mm, and the thickness of the first insulation block 4 is 10-300 mm.

[0053] This embodiment also provides a heat absorber for a solar thermal power station, comprising a plurality of heat absorbing tubes 1, an upper header 12 arranged at the upper end of the heat absorbing tubes 1, a lower header 13 arranged at the lower end of the heat absorbing tubes 1, and a header insulation device 14;

[0054] The outer peripheries of the upper header 12 and the lower header 13 are both provided with header insulation devices 14 , and the above-mentioned heat absorber insulation structure is provided at the connection between the header insulation device 14 and the plurality of heat absorbing tubes 1 .

[0055] When working, the mirror field of the solar thermal power station projects sunlight onto the tube panel of the absorber, thereby heating the flowing working fluid inside the tube panel to increase its temperature, and then converts the heat energy in the working fluid into electrical energy by direct or indirect methods. The absorber insulation structure insulates the tube panel on the back of the tube panel and the upper and lower headers to reduce heat loss. The absorber insulation structure of this embodiment mainly refers to the place where the header insulation device 14 and the absorber tube 1 are connected.

[0056] Embodiment 2:

[0057] See also Figure 6 This embodiment provides another absorber insulation structure for a solar thermal power station. The difference from Embodiment 1 is that the second insulation block 2 of this embodiment is arranged between the flexible insulation component 3 and the first insulation block 4.

[0058] The rest of the same points as in Example 1 will not be repeated here.

[0059] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the present invention, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0062] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0063] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A heat absorber insulation structure for a solar thermal power station, characterized in that: It comprises a flexible heat-insulating component (3) and a first heat-insulating block (4); The flexible heat-insulating component (3) and the first heat-insulating block (4) are both made of high-temperature resistant heat-insulating material and are arranged at the connection between the header heat-insulating device (14) of the heat absorber and the heat-absorbing tube (1). The first heat-insulating block (4) is arranged on the side of the flexible heat-insulating component (3) close to the header of the heat absorber, and a brush (5) is arranged on the end of the flexible heat-insulating component (3) close to the heat-absorbing tube (1), and the brush (5) is in contact with the heat-absorbing tube (1).

2. The heat absorber insulation structure according to claim 1, characterized in that: It also comprises a second insulation block (2) made of high temperature resistant insulation material, and the second insulation block (2) is arranged on a side of the flexible insulation component (3) away from the header of the heat absorber.

3. The heat absorber insulation structure according to claim 1, characterized in that: It also comprises a second insulation block (2) made of high temperature resistant insulation material, and the second insulation block (2) is arranged between the flexible insulation component (3) and the first insulation block (4).

4. The heat absorber insulation structure according to claim 1, characterized in that: The flexible heat-insulating component (3) comprises a flexible heat-insulating member (8) and two stainless steel plates (9); Two stainless steel plates (9) are respectively located on the upper surface and the lower surface of the flexible thermal insulation member (8), and the two stainless steel plates (9) and the flexible thermal insulation member (8) are fixed by perforating a plurality of first fasteners (10), and a brush (5) is formed at one end of the flexible thermal insulation member (8) close to the heat absorption tube (1), and the diameter of a single bristle of the brush (5) is 0.01-5 mm; The flexible heat-insulating member (8) is high-silica cloth, high-temperature resistant fiber paper, high-temperature resistant fiber cloth or aerogel.

5. The heat absorber insulation structure according to claim 2, characterized in that: It also includes a plurality of second fasteners (11), and the second thermal insulation block (2), the flexible thermal insulation component (3) and the first thermal insulation block (4) are fixedly connected together via the plurality of second fasteners (11); The first fastener (10) and the second fastener (11) are bolts and nuts; The second heat-insulating block (2) and the first heat-insulating block (4) are provided with grooves corresponding to the installation area of ​​the first fastener (10) for accommodating the head of the first fastener (10).

6. The heat absorber insulation structure according to claim 2, characterized in that: The side of the second heat-insulating block (2) facing away from the flexible heat-insulating component (3) is a light-receiving surface, and a high-temperature-resistant reflective coating is sprayed on the light-receiving surface of the second heat-insulating block (2).

7. The heat absorber insulation structure according to claim 2 or 3, characterized in that: The second heat-insulating block (2) has an electric heat trace (6) embedded in a groove on one side facing the heat-absorbing tube (1). The electric heat trace (6) is fixed to the second heat-insulating block (2) by means of a high-temperature resistant steel wire.

8. The heat absorber insulation structure according to claim 2 or 3, characterized in that: The first thermal insulation block (4) and the second thermal insulation block (2) are made of aluminum silicate thermal insulation blocks, aluminum silicate thermal insulation wool, ceramic fibers and / or aerogel thermal insulation materials.

9. The heat absorber insulation structure according to claim 2 or 3, characterized in that: The thickness of the second thermal insulation block (2) is 10-200 mm, the thickness of the flexible thermal insulation component (3) is 5-100 mm, and the thickness of the first thermal insulation block (4) is 10-300 mm.

10. The heat absorber insulation structure according to any one of claims 1 to 9, characterized in that: A comb-tooth portion (7) is provided at one end of the first heat-insulating block (4) close to the heat-absorbing tube (1); the shape of the comb-tooth portion (7) corresponds to the shape of the heat-absorbing tube (1), so that the comb-tooth portion (7) can abut against the heat-absorbing tube (1).

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