Heat absorber tube panel and tower type solar heat absorber

Abstract

The invention relates to a heat absorber tube panel and a tower type solar heat absorber, and the heat absorber tube panel comprises an upper collecting box, a lower collecting box and a heat absorbing tube row formed by arranging a plurality of heat absorbing tubes at intervals; the heat absorption pipe comprises an upper bent pipe section, a straight pipe section and a lower bent pipe section; the upper bent pipe section of each heat absorption pipe is communicated with the upper header, the lower bent pipe section of each heat absorption pipe is communicated with the lower header, the heat absorption pipe row, the upper header and the lower header comprise backlight faces and light receiving faces, sunlight reflected by the light reflecting face of the reflecting cover covers the backlight faces of the heat absorption pipe row, the upper header and the lower header, and the light receiving faces of the heat absorption pipe row, the upper header and the lower header cover the light receiving faces of the upper header and the lower header. And sunlight reflected by the mirror field covers the light receiving surfaces of the heat absorption tube row, the upper header and the lower header. The solar heat absorber tube panel has the advantages that sunlight reflected by the reflecting cover can cover the backlight area of the heat absorption tube row and the backlight areas of the upper header and the lower header at the same time, the problem that the tube panel is prone to freezing and blocking in the cold environment is solved, and the manufacturing and operation and maintenance cost of the heat absorber tube panel is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of solar power generation, and in particular to a heat absorber tube panel and a tower type solar heat absorber. Background Art

[0002] As a device that efficiently utilizes solar energy, solar thermal absorbers are widely used in power supply, heating, hot water supply and industrial thermal energy. Its core principle is to convert solar radiation energy into thermal energy through the absorber and transfer it to the internal medium for storage or direct use.

[0003] In tower solar thermal power generation systems, in order to improve efficiency and reduce heat loss, an insulation box is usually installed outside the collector of the heat absorber, and an electric heating system is also installed. Although the insulation box is designed to reduce heat loss, the insulation effect is greatly reduced due to insufficient structural sealing and frequent air leakage. Especially in cold areas, even with the assistance of an electric heating system, the collector and elbow structure in the insulation box may still freeze and block, seriously affecting the normal operation of the heat absorption system. This not only increases the workload of daily maintenance, but also greatly increases the operation and maintenance costs. The freezing and blocking of the collector and elbow structure has become a major bottleneck restricting the application of solar heat absorbers. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a heat absorber tube panel and a tower solar heat absorber, which solve the technical problem that the header and the curved tube structure of the existing tower solar heat absorber tube panel are prone to freezing and blocking accidents in cold environments.

[0006] (II) Technical solution

[0007] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0008] In a first aspect, an embodiment of the present invention provides a heat absorber tube panel, comprising an upper header, a lower header, and a heat absorber tube row formed by a plurality of heat absorber tubes arranged at intervals; the heat absorber tube comprises an upper curved tube section, a straight tube section, and a lower curved tube section; the upper curved tube section of each heat absorber tube is connected to the upper header, and the lower curved tube section is connected to the lower header; the heat absorber tube row, the upper header, and the lower header comprise a backlight surface and a light receiving surface, the light receiving surface is a side facing the mirror field, and the backlight surface is a side away from the mirror field, and further comprises a reflector;

[0009] The reflective cover is arranged on the backlight side of the heat absorbing tube row, and the side of the reflective cover facing the heat absorbing tube row is a reflective surface;

[0010] The sunlight reflected by the reflective surface of the reflector covers the backlight surfaces of the heat absorbing tube row, the upper header and the lower header, and the sunlight reflected by the mirror field covers the light-receiving surfaces of the heat absorbing tube row, the upper header and the lower header.

[0011] Optionally, in the absorber tube panel, the reflective surface of the reflector corresponds to the area of ​​each absorber tube and matches the shape of the absorber tube to form a folded surface structure;

[0012] A side of the heat absorbing tube facing the folding surface structure maintains a predetermined distance D1 from the folding surface structure, and the predetermined distance D1 is ≤ an outer radius R of the heat absorbing tube.

[0013] Optionally, in the absorber tube panel, the vertical height of the folded surface structure is D3, and R / 4<D3≤D1.

[0014] Optionally, in the absorber tube panel, the distance D2 between adjacent absorber tubes is ≤ the outer diameter 2R of the absorber tube.

[0015] Optionally, in the absorber tube panel, the central axis of the upper header is perpendicular to the plane where the upper curved tube section of each absorber tube is located;

[0016] The section of the reflective surface of the reflector corresponding to the backlight surface of the upper header is formed by connecting a plurality of planes around the central axis of the upper header in sequence;

[0017] The central axis of the lower header is perpendicular to the plane where each lower curved pipe section is located;

[0018] The position of the reflective surface of the reflector corresponding to the backlight area of ​​the lower header is formed by connecting a plurality of planes around the central axis of the lower header in sequence.

[0019] Optionally, the absorber tube panel further comprises a heat insulation layer, and the heat insulation layer is arranged on a side of the reflector cover away from the absorber tube row.

[0020] Optionally, the outer surfaces of the absorber tube panel, the upper header, the lower header and the absorber tubes are all coated with a heat absorbing coating.

[0021] Optionally, in the absorber tube panel, the reflective surface of the reflector cover is a reflector or a high-reflective coating.

[0022] Optionally, the absorber tube panel, the upper header, the upper curved pipe section, the lower header and the exterior of the lower curved pipe section do not include any electric heating components; the light-receiving surfaces of the upper header, the upper curved pipe section, the lower header and the lower curved pipe section do not include any insulation box structure.

[0023] In a second aspect, an embodiment of the present invention provides a tower solar thermal absorber, the thermal absorber tube panel described in the first aspect.

[0024] (III) Beneficial effects

[0025] The beneficial effects of the present invention are as follows: a heat absorber tube panel and tower solar heat absorber of the present invention, because a reflector is provided on the backlight side of the heat absorber tube row, the sunlight reflected by the reflector can simultaneously cover the backlight area of ​​the heat absorber tube row, the backlight area of ​​the upper header and the lower header, so as to assist the light-facing side of the heat absorber tube row to heat the heat absorber tube row, the upper header and the lower header. Compared with the prior art, the insulation box and electric heating structure of the upper header and the lower header are cancelled, which can effectively eliminate the blind area of ​​irradiation caused by the mirror field angle, so that the reflected light can directly irradiate the heat absorber tube row and the header, and the light source projection energy in the header and the bend section area is newly added, which effectively ensures the heat in the header and the bend section area. Thereby avoiding the problem that the bend section and the header of the heat absorber cannot reach the set temperature due to poor insulation and sealing effect. The sunlight reflected by the reflective cover can simultaneously cover the backlight area of ​​the absorber tube row, the upper header and the lower header, which effectively solves the problem of tube panel freezing in cold environments, simplifies the tube panel structure, and greatly reduces the manufacturing and operation and maintenance costs of the absorber tube panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic side view of an absorber tube panel and an absorber tube panel of Example 1 of a tower-type solar thermal absorber according to the present invention;

[0027] Figure 2 for Figure 1 Schematic diagram of the cross-section of the absorber tube panel at AA.

[0028] [Description of Reference Numerals]

[0029] 1: upper header; 2: lower header; 3: heat absorbing tube row; 31: heat absorbing tube; 311: upper curved tube section; 312: straight tube section; 313: lower curved tube section; 4: reflective cover; 41: reflective surface; 5: thermal insulation layer; 6: tube clamp; 7: mirror field;

[0030] D1: The distance between the side of the heat absorbing tube facing the folding surface structure and the lowest point of the folding surface structure;

[0031] D2: distance between adjacent heat absorption tubes;

[0032] D3: The vertical height of the folded surface structure. DETAILED DESCRIPTION

[0033] The embodiment of the present invention proposes a heat absorber tube panel and a tower solar thermal absorber. The header and bend structure of the existing tower solar thermal absorber tube panel are prone to freezing and blocking accidents in cold environments. A reflective cover is provided on the backlight side of the heat absorber tube row. The sunlight reflected by the reflective cover can simultaneously cover the backlight area of ​​the heat absorber tube row, the backlight area of ​​the upper header and the lower header, so as to assist the light-facing side of the heat absorber tube row to heat the heat absorber tube row, the upper header and the lower header. Compared with the prior art, the insulation box and electric heating structure of the upper header and the lower header are cancelled, which can effectively eliminate the blind area of ​​irradiation caused by the mirror field angle, so that the reflected light can directly irradiate the heat absorber tube row and the header, and the light source projection energy in the header and the bend section area is newly increased, which effectively ensures the heat in the header and the bend section area. This avoids the problem that the bend section and the header of the heat absorber cannot reach the set temperature due to poor insulation and sealing effect. The sunlight reflected by the reflective cover can simultaneously cover the backlight area of ​​the absorber tube row, the upper header and the lower header, which effectively solves the problem of tube panel freezing in cold environments, simplifies the tube panel structure, and greatly reduces the manufacturing and operation and maintenance costs of the absorber tube panel.

[0034] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0035] Embodiment 1:

[0036] Reference Figure 1 and Figure 2 The present embodiment provides a heat absorber tube panel, including an upper header 1, a lower header 2, and a heat absorber tube row 3 formed by a plurality of heat absorber tubes 31 arranged at intervals. The main function of the heat absorber tube 31 is to efficiently absorb solar radiation energy and convert it into heat energy, and at the same time transfer it to the subsequent thermal cycle system through the internal working medium. The heat absorber tube 31 includes an upper curved tube section 311, a straight tube section 312, and a lower curved tube section 313. The upper curved tube section 311 of each heat absorber tube 31 is connected to the upper header 1, and the lower curved tube section 313 is connected to the lower header 2.

[0037] The heat absorbing tube row 3, the upper header 1 and the lower header 2 include a backlight surface and a light-receiving surface. The light-receiving surface is the side facing the mirror field 7, and the backlight surface is the side opposite to the mirror field 7. The mirror field 7 is an array composed of a large number of reflectors, usually installed on the ground or on a bracket. Its main function is to reflect and focus sunlight, thereby improving energy density.

[0038] The absorber tube panel also includes a reflector 4, which is arranged on the backlight surface of the absorber tube row 3, and the side of the reflector 4 facing the absorber tube row 3 is a reflective surface 41. The sunlight reflected by the reflective surface 41 of the reflector 4 covers the backlight surface of the absorber tube row 3, the upper header 1 and the lower header 2, and the sunlight reflected by the mirror field 7 covers the light-receiving surface of the absorber tube row 3, the upper header 1 and the lower header 2. Among them, the sunlight reflected by the reflective surface 41 of the reflector 4 is also the sunlight reflected by the mirror field 7.

[0039] Here, the upper header 1 and the lower header 2, as well as the upper curved pipe section 311 and the lower curved pipe section 313, cancel the electric heating tracing components and the insulation box structure of the light-receiving surface, that is, the heat of the upper header 1, the lower header 2, the upper curved pipe section 311 and the lower curved pipe section 313 all comes from the sunlight reflected by the mirror field 7. In this way, the blind area of ​​irradiation caused by the angle of the mirror field 7 (formed by the insulation box structure blocking the light) can be effectively eliminated, so that the reflected light directly irradiates the heat-absorbing pipe row 3 and the header, and the light source projection energy in the header and curved pipe section area is newly increased, which effectively ensures the heat in the header and curved pipe section area. This avoids the problem that the curved pipe section and the header cannot reach the set temperature due to poor insulation and sealing effect of the heat absorber. The sunlight reflected by the reflector 4 can simultaneously cover the backlight area of ​​the heat-absorbing pipe row 3, the backlight area of ​​the upper header 1 and the lower header 2, which effectively solves the problem that the tube panel is prone to freezing in a cold environment, simplifies the tube panel structure, and greatly reduces the manufacturing and operation and maintenance costs of the heat absorber tube panel.

[0040] Reference Figure 1 and Figure 2 This embodiment provides a heat absorber tube screen, in which the reflective surface 41 of the reflector 4 corresponds to the area of ​​each heat absorber tube 31 and matches the shape of the heat absorber tube 31 to form a folded surface structure. The middle area of ​​the folded surface structure is a plane area, which extends along the extension direction of the heat absorber tube 31. The two sides of the plane area are symmetrically arranged planes, and the symmetrically arranged planes and the plane area of ​​the middle area enclose a concave space of the folded surface structure, and the concave space corresponds to the heat absorber tube 31. The side of the heat absorber tube 31 facing the folded surface structure maintains a predetermined distance D1 from the folded surface structure, and the predetermined distance D1≤the outer radius R of the heat absorber tube 31, that is, the heat absorber tube 31 is completely separated from the reflective surface 41. In addition, the vertical height of the folded surface structure is D3, and R / 4<D3≤D1. The use of a folded surface structure for the reflective surface 41 has the following advantages: First, the angles between the folded surfaces can be independently adjusted according to the specific conditions of the backlight area of ​​the heat absorbing tube 31, thereby achieving precise control of the light, effectively reflecting the light projected by the mirror field 7, reducing heat loss, and ensuring that the light projected by the mirror field 7 is further reflected onto the backlight surface of the heat absorbing tube 31. Second, the folded surface structure is composed of standardized plane units, which is convenient for modular production and installation, and reduces construction difficulty and cost.

[0041] The setting of the reflective structure can multiply the heat absorbing surface area of ​​the heat absorbing tube 31, reduce the usage of the expensive heat absorbing tube 31, improve the efficiency of the heat absorber, and reduce the material cost.

[0042] Reference Figure 1 and Figure 2 This embodiment provides a heat absorber tube panel, wherein the distance D2 between adjacent heat absorber tubes 31 is ≤ the outer diameter 2R of the heat absorber tube 31. Properly increasing the spacing between the heat absorber tubes 31 can alleviate the problem of uneven heating on the light-receiving side and the backlight side of the heat absorber tube 31, and increase the heat absorption area of ​​the heat absorber tube 31.

[0043] Reference Figure 1 and Figure 2 This embodiment provides a heat absorber tube panel, in which the central axis of the upper header 1 is perpendicular to the plane where the upper curved tube section 311 of each heat absorbing tube 31 is located. The reflective surface 41 of the reflector 4 corresponds to the section of the backlight surface of the upper header 1, which is formed by connecting a plurality of planes around the central axis of the upper header 1 in sequence. Generally, the header is cylindrical. Multiple heat absorbing tubes 31 share one upper header 1, and the reflective surface 41 of the reflector 4 is connected in sequence by a plurality of planes, so that the light projected by the mirror field 7 can be further reflected onto the backlight surface of the upper header 1. The central axis of the lower header 2 is perpendicular to the plane where each lower curved tube section 313 is located. The position of the reflective surface 41 of the reflector 4 corresponding to the backlight area of ​​the lower header 2 is formed by connecting a plurality of planes around the central axis of the lower header 2 in sequence.

[0044] Reference Figure 1 and Figure 2 This embodiment provides a heat absorber tube panel, which also includes a heat insulation layer 5. The heat insulation layer 5 is arranged on the side of the reflector 4 away from the heat absorber tube row 3. The function of the heat insulation layer 5 is to prevent the heat generated when the reflector 4 receives solar energy from damaging other structures on the side of the reflector 4 away from the reflective surface 41, such as a steel structure (not shown in the figure). The heat insulation layer 5 plays a protective role. The heat insulation layer 5 can be a heat preservation board. The reflective surface 41 of the reflector 4 is a reflector or a high-reflective coating. The high-reflective coating can be directly coated on the heat preservation board, and the functions of the reflector 4 and the heat insulation layer 5 are played at the same time. Among them, the reflector or the high-reflective coating refers to the prior art. The heat absorber tube 31 is fixed to the steel structure located on the side of the reflector 4 away from the reflective surface through the tube clamp 6. The tube clamp 6 passes through the reflector 4, and the reflector 4 can also be overlapped on the tube clamp 6.

[0045] Reference Figure 1 and Figure 2 This embodiment provides a heat absorber tube panel, and the outer surfaces of the upper header 1, the lower header 2 and the heat absorbing tube 31 are coated with a heat absorbing coating, which is beneficial to improving the heat absorption efficiency of the upper header 1, the lower header 2 and the heat absorbing tube 31. For details of the heat absorbing coating, refer to the prior art.

[0046] Embodiment 2:

[0047] This embodiment provides a tower solar thermal absorber, including the absorber tube panel in Embodiment 1.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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 tube panel, comprising an upper header (1), a lower header (2) and a heat absorber tube row (3) formed by a plurality of heat absorber tubes (31) arranged at intervals; the heat absorber tubes (31) comprise an upper curved tube section (311), a straight tube section (312) and a lower curved tube section (313); the upper curved tube section (311) of each heat absorber tube (31) is connected to the upper header (1), and the lower curved tube section (313) is connected to the lower header (2); the heat absorber tube row (3), the upper header (1) and the lower header (2) comprise a backlight surface and a light-receiving surface, the light-receiving surface being a side facing the mirror field, and the backlight surface being a side facing away from the mirror field, characterized in that: Also includes a reflector (4); The reflective cover (4) is arranged on the backlight surface of the heat absorbing tube row (3), and the side of the reflective cover (4) facing the heat absorbing tube row (3) is a reflective surface (41); The sunlight reflected by the reflective surface (41) of the reflective cover (4) covers the backlight surfaces of the heat absorbing tube row (3), the upper header (1) and the lower header (2), and the sunlight reflected by the mirror field covers the light-receiving surfaces of the heat absorbing tube row (3), the upper header (1) and the lower header (2).

2. The absorber tube panel according to claim 1, characterized in that: The reflective surface (41) of the reflective cover (4) corresponds to the area of ​​each heat absorbing tube (31) and matches the shape of the heat absorbing tube (31) to form a folded surface structure; The side of the heat absorbing tube (31) facing the folding surface structure maintains a predetermined distance D1 from the folding surface structure, and the predetermined distance D1 is ≤ the outer radius R of the heat absorbing tube (31).

3. The absorber tube panel according to claim 2, characterized in that: The vertical height of the folding surface structure is D3, and R / 4<D3≤D1.

4. The absorber tube panel according to claim 3, characterized in that: The distance D2 between adjacent heat absorbing tubes (31) is ≤ the outer diameter 2R of the heat absorbing tube (31).

5. The absorber tube panel according to claim 1, characterized in that: The central axis of the upper header (1) is perpendicular to the plane where the upper curved pipe section (311) of each heat absorbing pipe (31) is located; The section of the reflective surface (41) of the reflector (4) corresponding to the backlight surface of the upper header (1) is formed by sequentially connecting a plurality of planes surrounding the central axis of the upper header (1); The central axis of the lower header (2) is perpendicular to the plane where each lower curved pipe section (313) is located; The position of the reflective surface (41) of the reflector (4) corresponding to the backlight area of ​​the lower header (2) is formed by connecting a plurality of planes surrounding the central axis of the lower header (2) in sequence.

6. The absorber tube panel according to claim 1, characterized in that: It also comprises a heat insulation layer (5), wherein the heat insulation layer (5) is arranged on a side of the reflector (4) facing away from the heat absorbing tube row (3).

7. The absorber tube panel according to claim 1, characterized in that: The outer surfaces of the upper header (1), the lower header (2) and the heat absorbing tube (31) are all coated with a heat absorbing coating.

8. The absorber tube panel according to claim 1, characterized in that: The reflective surface (41) of the reflector (4) is a reflector or a high-reflective coating.

9. The absorber tube panel according to claim 1, characterized in that: The exterior of the upper header (1), the upper curved pipe section (311), the lower header (2) and the lower curved pipe section (313) do not include any electric heating tracing components; The light-receiving surfaces of the upper header (1), the upper curved pipe section (311), the lower header (2) and the lower curved pipe section (313) do not include a heat preservation box structure.

10. A tower solar thermal absorber, characterized in that: The heat absorber tube panel comprises the heat absorber tube panel according to any one of claims 1 to 9.

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