Heat absorption tube panel with medium flow equalizing structure and fused salt heat absorber

Abstract

The utility model relates to the technical field of heat absorption structures of fused salt heat absorbers, in particular to a heat absorption tube panel with a medium flow equalizing structure and a fused salt heat absorber, which comprise two headers distributed at intervals, two groups of branch tubes and a plurality of heat absorption tubes, the multiple medium channels form multiple circulation areas between the two headers, the medium channels comprise throttling channels, the circulation efficiency of the throttling channels corresponding to the circulation areas closer to the two sets of branch pipes is lower, and the circulation efficiency of the throttling channels corresponding to the circulation areas farther from the two sets of branch pipes is higher. The heat exchanger has the advantages that due to the design of the throttling channels, the medium channels low in circulation efficiency can correspond to areas close to the branch pipes where large-flow media can be easily obtained, the medium channels high in circulation efficiency can correspond to areas away from the branch pipes where large-flow media can not be easily obtained, and therefore the flow in each heat absorption pipe is balanced, and the heat exchange efficiency is improved. And the overall use effect of the heat absorption tube panel is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of heat absorption structure of molten salt heat absorber, and in particular to a heat absorption tube screen with a medium flow equalization structure and a molten salt heat absorber. Background Technology

[0002] With the increasing power output of concentrated solar power (CSP) plants in recent years, the size of single-tube molten salt receivers has also increased, leading to significant differences in the flow rate of the medium within the receiver tubes at different locations. Areas near the branch pipes often experience relatively high flow rates due to the branch pipe structure and the converging effect of the medium flow; while areas farther from the branch pipes experience relatively low flow rates. This uneven flow rate can cause a series of problems.

[0003] On the one hand, uneven flow rate leads to uneven heating of the heat absorber tube screen. This temperature difference causes uneven heating of the entire heat absorber tube screen, which in turn affects its heat exchange efficiency and reduces the power generation efficiency of the entire system. On the other hand, under long-term high temperature and uneven flow rate operating environment, the heat absorber tubes are susceptible to thermal stress, which accelerates their aging, deformation, and even damage, shortens the service life of the heat absorber tube screen, and increases the maintenance cost and operational risk of the equipment.

[0004] To address the aforementioned issues, a heat absorber tube screen structure that can effectively balance the flow rate of the medium within the heat absorber tube is needed to improve the overall performance of the heat absorber tube screen and ensure its stability and reliability during long-term operation. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a heat-absorbing tube screen with a medium uniform flow structure and a molten salt heat absorber, which solves the technical problem of uneven flow of heat-absorbing tubes in the prior art.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0009] In a first aspect, this utility model provides a heat-absorbing tube screen with a medium flow equalization structure, including two spaced-apart headers, two sets of branch pipes, and several heat-absorbing tubes; several pipe holes are respectively opened on the two headers, and the two ends of the heat-absorbing tubes are connected to the corresponding pipe holes, so that the inner cavity of the heat-absorbing tube and the two corresponding pipe holes form a medium channel; multiple medium channels form multiple flow areas between the two headers, and each medium channel includes a throttling channel. The flow efficiency of the throttling channel corresponding to the flow area closer to the two sets of branch pipes is lower, and the flow efficiency of the throttling channel corresponding to the flow area farther away from the two sets of branch pipes is higher.

[0010] In one technical solution of this utility model, the pipe hole on one header forms a throttling channel, and the pipe hole on the other header has the same diameter; the pipe hole forming the throttling channel is smaller closer to the flow area of ​​the two sets of branch pipes, and the pipe hole forming the throttling channel is larger further away from the flow area of ​​the two sets of branch pipes.

[0011] In one technical solution of this utility model, the pipe holes on both headers form throttling channels; the pipe hole diameter is smaller closer to the flow area of ​​the two sets of branch pipes, and the pipe hole diameter is larger further away from the flow area of ​​the two sets of branch pipes.

[0012] In one technical solution of this utility model, the heat absorption pipe includes a reduced diameter section, the inner cavity of which forms a throttling channel. The inner diameter of the reduced diameter section is smaller the closer it is to the flow area of ​​the two sets of branch pipes, and the inner diameter of the reduced diameter section is larger the further it is from the flow area of ​​the two sets of branch pipes.

[0013] In one technical solution of this utility model, the inner cavities of the two headers are both cylindrical, and the two sets of branch pipes extend radially and are fixedly connected to the middle position of the corresponding header in the length direction.

[0014] In one technical solution of this utility model, an odd number of flow areas, which is greater than one, are formed along the length of the header, and the throttling efficiency of the throttling channels within a flow area is consistent.

[0015] In one technical solution of this utility model, the circulation area is symmetrically arranged along the centerline of the header length direction, and the throttling efficiency of the throttling channels corresponding to the symmetrical outer circulation areas is consistent.

[0016] Secondly, this utility model provides a molten salt heat absorber, including the heat absorber tube screen with a medium flow equalization structure as described in the above technical solution.

[0017] (III) Beneficial Effects

[0018] The beneficial effects of this utility model are as follows: In the heat absorption tube screen with a medium flow equalization structure, when the medium enters from one header to the other, it passes through the medium channel. Due to the design of the throttling channel, the flow resistance of the medium is greater and the flow efficiency is lower in the flow area closer to the branch pipe. Conversely, the closer to the branch pipe, the easier it is for the medium channel to receive a large flow of medium. Therefore, through the throttling channel, the medium channel with low flow efficiency corresponds to the area closer to the branch pipe where a large flow of medium is easily obtained, and the medium channel with high flow efficiency corresponds to the area farther from the branch pipe where a large flow of medium is not easily obtained. This balances the flow rate in each heat absorption tube, improves the overall performance of the heat absorption tube screen, and avoids the problem of uneven heating of the heat absorption tube screen caused by uneven flow.

[0019] Meanwhile, the structure of the heat absorption tube screen is not much different from that of the traditional heat absorption tube screen, so it is very convenient for manufacturers to modify it themselves, which ensures the convenience of implementing this utility model and reduces costs. Attached Figure Description

[0020] Figure 1 This is one of the structural schematic diagrams of the heat-absorbing tube screen with a medium flow equalization structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the header and branch pipe of this utility model;

[0022] Figure 3 This is one of the structural schematic diagrams of the tube hole of this utility model;

[0023] Figure 4 This is the second schematic diagram of the structure of the tube hole of this utility model;

[0024] Figure 5 This is the second schematic diagram of the heat-absorbing tube screen with a medium flow equalization structure of this utility model.

[0025] [Explanation of Labels in the Attached Image]

[0026] 1: Header; A. Pipe opening; B. Flow area;

[0027] 2: Branch pipe;

[0028] 3: Heat absorption tube; 31: Reduced diameter section. Detailed Implementation

[0029] To better explain and facilitate understanding of this utility model, the following description is provided in conjunction with the appendix. Figures 1-5 This invention will be described in detail through specific embodiments. Wherein, directional terms such as "upper" and "lower" are used in this document. Figure 1 The orientation is used as a reference.

[0030] Example 1:

[0031] Reference Figures 1-5 This utility model provides a heat-absorbing tube screen with a medium flow equalization structure, including two spaced-apart headers 1, two sets of branch pipes 2, and several heat-absorbing tubes 3; several pipe holes A are respectively opened on the two headers 1, and the two ends of the heat-absorbing tubes 3 are connected to the corresponding pipe holes A, so that the inner cavity of the heat-absorbing tubes 3 and the corresponding two pipe holes A form a medium channel; multiple medium channels form multiple flow areas B between the two headers 1, and each medium channel includes a throttling channel. The flow efficiency of the throttling channel corresponding to the flow area B closer to the two sets of branch pipes 2 is lower, and the flow efficiency of the throttling channel corresponding to the flow area B further away from the two sets of branch pipes 2 is higher.

[0032] In this embodiment, when the medium enters the other header 1 from one side header 1, it passes through the medium channel. Due to the design of the throttling channel, the medium flow resistance is greater and the flow efficiency is lower in the flow area B closer to the branch pipe 2. However, the closer the medium channel is to the branch pipe 2, the easier it is to obtain a large flow of medium. Therefore, by using the throttling channel, the medium channel with low flow efficiency can correspond to the area closer to the branch pipe 2 where it is easy to obtain a large flow of medium, and the medium channel with high flow efficiency can correspond to the area farther away from the branch pipe 2 where it is not easy to obtain a large flow of medium. In this way, the flow rate in each heat absorption tube 3 is balanced, the overall performance of the heat absorption tube screen is improved, and the problem of uneven heating of the heat absorption tube screen caused by uneven flow is avoided.

[0033] Meanwhile, the structure of the heat absorption tube screen is not much different from that of the traditional heat absorption tube screen, so it is very convenient for manufacturers to modify it themselves, which ensures the convenience of implementing this utility model and reduces costs.

[0034] Example 2:

[0035] Reference Figures 1-4 In addition to possessing all the technical solutions of the above embodiments, the embodiments of this utility model further possess the following technical solutions:

[0036] The pipe hole A on one header 1 forms a throttling channel, and the pipe hole A on the other header 1 has the same diameter; the closer the pipe hole A is to the flow area B of the two sets of branch pipes 2, the smaller the diameter of the pipe hole A that forms the throttling channel, and the farther away the pipe hole A is from the flow area B of the two sets of branch pipes 2, the larger the diameter of the pipe hole A that forms the throttling channel.

[0037] In this embodiment, the orifice A on one of the headers 1 forms a throttling channel, and the flow rate of the medium is controlled by adjusting the orifice size. The orifice A on the other header 1 has the same diameter and does not form a throttling channel; it is mainly used for the smooth passage of the medium.

[0038] When the medium enters the absorber tube screen from one side header 1, it is first distributed to each absorber tube 3 through branch pipe 2. At header 1, which forms a throttling channel, the medium is obstructed to varying degrees depending on the orifice size. The flow area B near branch pipe 2 has a smaller orifice size, resulting in higher flow resistance and lower flow efficiency. Conversely, the flow area B further away from branch pipe 2 has a larger orifice size, resulting in lower flow resistance and higher flow efficiency. This leads to more uniform flow of the medium within the absorber tube screen, optimizing its performance.

[0039] Example 3:

[0040] Reference Figures 1-3 In addition to possessing all the technical solutions of the above embodiments, the embodiments of this utility model further possess the following technical solutions:

[0041] The pipe holes A on both headers 1 form throttling channels; the closer the pipe hole A is to the flow area B of the two sets of branch pipes 2, the smaller the diameter of the pipe hole A; the farther away the pipe hole A is from the flow area B of the two sets of branch pipes 2, the larger the diameter of the pipe hole A.

[0042] In this embodiment, the pipe holes A on both headers 1 form throttling channels, which allows the flow efficiency of the medium channel to be reasonably restricted at both the inlet and outlet. Compared with the technical solution in embodiment 2 that only restricts the flow efficiency at the inlet or outlet of the medium channel, this method is more reliable and more conducive to improving the stability of the medium flow process.

[0043] Example 4:

[0044] Reference Figure 1 , Figure 2 , Figure 4 and Figure 5 In addition to possessing all the technical solutions of the above embodiments, the embodiments of this utility model further possess the following technical solutions:

[0045] The heat absorption pipe 3 includes a reduced diameter section 31. The inner cavity of the reduced diameter section 31 forms a throttling channel. The inner diameter of the reduced diameter section 31 corresponding to the flow area B of the two sets of branch pipes 2 is smaller, and the inner diameter of the reduced diameter section 31 corresponding to the flow area B of the two sets of branch pipes 2 is larger.

[0046] In this embodiment, the heat absorber tube 3 can be configured as a segmented structure. By adjusting the inner diameter of the reduced diameter section 31, the flow efficiency of the medium channel can be adjusted. Compared with the technical solution of adjusting the inner diameter of the medium channel inlet or outlet, adjusting the inner diameter of the reduced diameter section 31 of the heat absorber tube 3 is more flexible. The two headers 1 can be processed to be completely identical, which is beneficial to improving the interchangeability of the headers 1. As for the heat absorber tube 3, since it is welded on in the assembly process of the heat absorber tube screen, the heat absorber tube 3 is easier to pre-process to ensure that it has the required inner diameter of the reduced diameter section 31, thereby improving the assembly efficiency of the heat absorber tube screen.

[0047] Example 5:

[0048] Reference Figure 1 and Figure 2 In addition to possessing all the technical solutions of the above embodiments, the embodiments of this utility model further possess the following technical solutions:

[0049] The two headers 1 and the two sets of branch pipes 2 have the same internal cavity structure, and the connection positions of the two sets of branch pipes 2 on the corresponding headers 1 are consistent. This can improve the predictability of the flow path of the medium during the flow process, and thus provide convenience for the arrangement of the throttling channel.

[0050] Specifically, the two headers 1 can be configured as cylindrical cavities, and the branch pipe 2 extends radially and is connected at the midpoint of the length direction of the two headers 1, so as to further improve the predictability of the medium flow and thus further improve the convenience of the arrangement of the throttling channel.

[0051] Example 6:

[0052] Reference Figure 3 In addition to possessing all the technical solutions of the above embodiments, the embodiments of this utility model further possess the following technical solutions:

[0053] An odd number of flow areas B, each larger than one, are formed along the length of header 1. The throttling efficiency of the throttling channels within a flow area B is consistent, thereby improving the convenience and regularity of the throttling channel layout. At the same time, since the flow efficiency requirements of different media channels within each flow area B do not fluctuate significantly, the throttling channels are also distributed according to the area. This ensures the homogeneity of the heat absorption tube screen while reducing its manufacturing cost.

[0054] The flow area B is symmetrically arranged along the centerline of the length direction of the header 1, and the throttling efficiency of the throttling channels corresponding to the symmetrical outer flow area B is consistent. This ensures the homogeneity of the heat absorption tube screen under the condition that the inner cavity of both headers 1 is cylindrical, both sets of branch pipes 2 extend radially, and are fixedly connected to the middle position of the length direction of the corresponding headers 1. At the same time, the symmetrical arrangement is also conducive to further reducing process costs.

[0055] Example 7:

[0056] In addition to providing a molten salt heat absorber, the embodiments of this utility model include the heat absorber tube screen with a medium flow equalization structure as described in any of the above embodiments. Therefore, the molten salt heat absorber has all the beneficial effects of any of the above embodiments, and will not be described in detail here to avoid repetition.

[0057] It can be understood that, except for conflicting parts, the above embodiments 1-7 can be freely combined to form other embodiments of this utility model.

[0058] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0059] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0060] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0061] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0062] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A heat-absorbing tube screen with a medium flow equalization structure, characterized in that: It includes two spaced-apart headers (1), two sets of branch pipes (2) and several heat absorption pipes (3), with each branch pipe (2) corresponding to one of the headers (1); The two headers (1) are respectively provided with a plurality of pipe holes (A), and the heat-absorbing pipe (3) is located between the two headers (1) and its two ends are connected to the corresponding pipe holes (A) so that the inner cavity of the heat-absorbing pipe (3) and the two corresponding pipe holes (A) form a medium channel; Multiple media channels form multiple flow areas (B) between the two headers (1). Each flow area (B) contains at least one media channel. Each media channel contains a throttling channel. The flow efficiency of the throttling channel corresponding to the flow area (B) closer to the two sets of branch pipes (2) is lower, and the flow efficiency of the throttling channel corresponding to the flow area (B) further away from the two sets of branch pipes (2) is higher.

2. The screen of claim 1, wherein: The orifice (A) on one of the headers (1) forms the throttling channel, and the orifice (A) on the other header (1) has the same diameter; The diameter of the orifice (A) forming the throttling channel is smaller for the flow area (B) closer to the two sets of branch pipes (2), and larger for the orifice (A) forming the throttling channel further away from the flow area (B) of the two sets of branch pipes (2).

3. The heat-absorbing tube screen with a medium flow equalization structure as described in claim 1, characterized in that: The pipe holes (A) on both headers (1) form the throttling channels; The diameter of the orifice (A) corresponding to the flow area (B) closer to the two sets of branch pipes (2) is smaller, and the diameter of the orifice (A) corresponding to the flow area (B) further away from the two sets of branch pipes (2) is larger.

4. The heat-absorbing tube screen with a medium flow equalization structure as described in claim 1, characterized in that: The heat absorption pipe (3) includes a reduced diameter section (31), the inner cavity of which forms the throttling channel. The inner diameter of the reduced diameter section (31) corresponding to the flow area (B) of the two sets of branch pipes (2) is smaller, and the inner diameter of the reduced diameter section (31) corresponding to the flow area (B) of the two sets of branch pipes (2) is larger.

5. The screen of claim 1-4, wherein: The inner cavities of both headers (1) are cylindrical, and the two sets of branch pipes (2) extend radially and are fixedly connected to the middle position of the corresponding header (1) in the length direction.

6. The heat-absorbing tube screen with a medium flow equalization structure as described in claim 4, characterized in that: An odd number of flow areas (B) are formed along the length of the header (1), and the throttling efficiency of the throttling channels within a flow area (B) is consistent.

7. The heat-absorbing tube screen with a medium flow equalization structure as described in claim 5, characterized in that: The circulation area (B) is symmetrically arranged along the centerline of the length direction of the header (1), and the throttling efficiency of the throttling channel corresponding to the symmetrical outer circulation area (B) is consistent.

8. A molten salt absorber, characterized in that: Including the heat absorber screen with a medium flow equalization structure as described in any one of claims 1-7.

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