Compound connecting structure of heat exchanger
By adopting a duplex connection structure in large solid electric heat storage equipment, multiple sets of heat exchangers are connected in series and parallel, the problems of complex control and easy damage to the heat exchange tube are solved, and the simplification and stability of the equipment are improved.
Patent Information
- Application Number
- CN202422003800.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-19
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-08-19
AI Technical Summary
In large solid electric heat storage equipment, the parallel structure of multiple sets of heat exchange modules leads to complex control, and the cross-section of the heat exchange tube is small, easy to damage and scaling.
Using a duplex connection structure, multiple groups of heat exchangers are connected through a series mode, including a vertical and horizontal series combination structure, forming a parallel connection, changing the traditional multi-unit independent parallel output mode.
The process system and control logic are simplified, the service life of the heat exchange pipe is improved, the easy damage and blockage are avoided, and the stability and reliability of the equipment are improved.
Smart Images
Figure CN223063828U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of solid electric heat storage, and particularly relates to a compound structure in which a plurality of unit heat exchangers are connected in series. Background Art
[0002] In the increasing number of clean electric energy optimization and utilization projects, solid electric heat storage equipment occupies a place in the heat storage energy industry with its high cost performance, high stability and reliability, and is a project widely recognized by users. The main structure of traditional solid electric heat storage equipment consists of a heat storage body and a heat exchanger. In equipment design, to ensure the balance of heat storage and heat release, the basic heat storage body and heat exchanger are in a corresponding relationship. For traditional small power (heat storage power ≤ 3MW), such a small number of matches is still relatively convenient in use and control. However, when the power is large or above one hundred megawatts, there are many heat exchange modules, and the complexity of system control is relatively cumbersome. Moreover, the parallel structure adopted by multiple heat exchange modules in output results in a small cross-section of the heat exchange tubes in the heat exchange modules, which will cause adverse phenomena such as easy damage and easy scaling during long-term use. Summary of the Invention
[0003] In view of the deficiencies of the above-mentioned prior art, the purpose of the present utility model is to provide a compound connection structure for heat exchangers, aiming to solve the problems in the prior art that there are too many corresponding heat exchange modules in large-scale equipment, resulting in cumbersome system control, and the parallel structure adopted by multiple heat exchange modules in output, resulting in a small cross-section of the heat exchange tubes in the heat exchange modules, which will cause adverse phenomena such as easy damage and easy scaling during long-term use.
[0004] To achieve the above purpose, the present utility model adopts the following technical solutions:
[0005] A compound connection structure for heat exchangers includes Compound Connection Structure One and Compound Connection Structure Two; Compound Connection Structure One is a connection structure in which 3 to 6 layers of steam heat exchangers are connected in series vertically, then connected to the top steam drum, and then the combined structure of each single-row series heat exchangers in N (N≥1) columns horizontally is connected in parallel through a steam output main pipe. Its characteristics further include:
[0006] A heat storage body, which is made of fire-resistant sintered bricks and has a structure integrating electric energy heat storage and heat energy release. It is placed on one side of the steam heat exchanger and connected to the steam heat exchanger;
[0007] A steam heat exchanger, which is welded by metal finned tubes, is provided with a steam heat exchanger input pipe and a steam heat exchanger output pipe, is placed on one side of the heat storage body and connected to the heat storage body;
[0008] A steam drum, which is placed on the top of the top-layer steam heat exchanger vertically and is connected to the output pipe of the top-layer steam heat exchanger through a connecting pipe;
[0009] The lower header is placed at the bottom of the steam heat exchangers in the 3rd to 6th vertical layers, connected to the input pipe of the 1st - layer steam heat exchanger through a connecting pipe, and connected to the steam drum through a down - coming pipe.
[0010] The second compound connection structure is a connection structure in which M (M≥3) rows of once - through heat exchangers in the horizontal direction are connected in series and then the once - through heat exchanger combination structures of each of the 1st to 6th vertical layers are connected in parallel through a main steam output pipe. It is characterized by further comprising:
[0011] The heat storage body is made of refractory sintered bricks and has a structure integrating electric energy heat storage and heat energy release. It is placed on one side of the heat exchanger and connected to the heat exchanger.
[0012] The once - through heat exchanger is welded by metal finned tubes, placed on one side of the heat storage body and connected to the heat storage body.
[0013] Among them, the once - through heat exchanger includes:
[0014] The primary heat exchanger is a low - temperature heat exchanger with a primary heat exchanger inlet and a primary heat exchanger outlet, and is arranged at the rear end of the secondary heat exchanger.
[0015] The secondary heat exchanger is a high - temperature heat exchanger with a secondary heat exchanger inlet and a secondary heat exchanger outlet, and is arranged at the front end of the primary heat exchanger, that is, on the side close to the heat storage body.
[0016] Furthermore, the series combination structure of the first compound connection structure and the second compound connection structure further includes:
[0017] The series steam heat exchanger combination structure is arranged in the first compound connection structure and is a combination structure in which the input pipes and output pipes of the steam heat exchangers in the 3rd to 6th vertical layers are connected in series through connecting pipes in sequence.
[0018] The series combination structure of the once - through heat exchangers is arranged in the second compound connection structure and is a combination structure in which M (M≥3) horizontally adjacent rows of once - through heat exchangers in the horizontal layer are connected in series through connecting pipes in sequence. Among them, the series connection mode is that the primary heat exchanger inlet in the first row of once - through heat exchangers in the layer is connected to the primary heat exchanger inlet in the second row of once - through heat exchangers through the primary heat exchanger outlet, and is connected in series in sequence to the primary heat exchanger inlet in the Mth row of once - through heat exchangers in this layer. Then, the primary heat exchanger outlet in the Mth row of once - through heat exchangers is connected to the secondary heat exchanger inlet, and the secondary heat exchangers are connected in series in reverse according to the series mode of the primary heat exchangers, forming a combination structure in which the primary heat exchangers in the once - through heat exchangers of this layer are first connected in series and then the secondary heat exchangers are connected in series in sequence. The total inlet of the combination structure is the primary heat exchanger inlet of the first row of once - through heat exchangers, and the total outlet is the secondary heat exchanger outlet of the first row of once - through heat exchangers.
[0019] Furthermore, the connection structure of the make-up water pump further includes:
[0020] It is arranged in the first compound connection structure. One end of the make-up water pump is connected to the make-up water pipeline, and the other end is connected to the lower header.
[0021] It is arranged in the second compound connection structure. One end of the make-up water pump is connected to the make-up water pipeline, and the other end is connected to the inlet of the primary heat exchanger in the first row of the direct current heat exchangers between layers.
[0022] The technical solution adopted by the present utility model has the following beneficial effects:
[0023] In this application, the first compound connection structure and the second compound connection structure are a kind of integration of the original small-unit heat exchanger output mode into a complete set of integrated output by changing the connection structure. This not only simplifies the process system, but also greatly reduces the control module, and at the same time, the control logic is improved and optimized. Among them, both compound connection structures achieve structural integration through a series connection mode, changing the original multi-unit independent parallel output mode. Under the same rated power output, the heat exchange tubes in the heat exchanger in the series connection mode are compared with the heat exchange tubes in the heat exchanger in the parallel connection mode. On the premise of equal output, the cross-section of the heat exchange tubes in the series connection mode must be appropriately increased, which greatly improves the service life of the heat exchange tubes and avoids the occurrence of adverse phenomena such as easy damage and blockage due to too thin heat exchange tubes. Description of the Drawings
[0024] By referring to the accompanying drawings and reading the following detailed description, the above and other objects, features, and advantages of the exemplary embodiments of the present utility model will become easy to understand. In the drawings, several embodiments of the present utility model are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, where:
[0025] Figure 1 is a schematic connection structure diagram of the first compound connection structure of the present utility model;
[0026] Figure 2 is a unit side view of the first compound connection structure of the present utility model;
[0027] Figure 3 is a schematic connection structure diagram of the second compound connection structure of the present utility model;
[0028] Figure 4 is a unit side view of the second compound connection structure of the present utility model;
[0029] Explanation of the reference numerals in the drawings:
[0030] 1. Heat storage body, 2. Steam heat exchanger, 3. Connecting pipe, 4. Steam heat exchanger output pipe, 5. Steam heat exchanger input pipe, 6. Lower header, 7. Downcomer, 8. Steam drum, 9. Steam drum steam output pipe, 10. Total steam output pipe, 11. Make-up water pump, 12. Make-up water pipe, 13. Once-through heat exchanger, 13-1. Primary heat exchanger, 13-1-1. Primary heat exchanger inlet, 13-1-2. Primary heat exchanger outlet, 13-2. Secondary heat exchanger, 13-2-1. Secondary heat exchanger inlet, 13-2-2. Secondary heat exchanger outlet. Detailed implementation manners
[0031] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.
[0032] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present invention should be the ordinary meanings understood by those skilled in the art to which the present invention belongs. In this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Terms such as "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium. Terms such as "including" and "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a process, method, article, or device. Without further limitation, the elements defined by the statement "including..." do not exclude the existence of additional identical elements in the process, method, article, or device including the said elements.
[0033] According to the existing technical problems, a compound structure mode with multiple heat exchange modules connected in series is proposed, integrating the output mode of the original unit heat exchanger into a complete set of integrated output. This not only simplifies the process system, but also greatly reduces the control modules. At the same time, the control logic is improved and optimized. The proposed new compound connection structure realizes the structure integration through a series connection mode, changing the original multi-unit independent parallel output mode. Under the same rated output power, the heat exchange tubes in the heat exchanger in the series mode compared with those in the heat exchanger in the parallel mode must have a moderately increased cross-section on the premise of equal output, which greatly improves the service life of the heat exchange tubes and avoids or reduces the occurrence of adverse phenomena such as easy damage and blockage due to too thin heat exchange tubes.
[0034] In this technical solution, a compound connection structure of a heat exchanger is a component of the prior art "solid electric heat storage device". Parts not described or not described in detail in this specification include: heat storage body, heat exchanger, air duct, electric heating, heat preservation layer, etc.
[0035] This embodiment provides a compound connection structure one in a compound connection structure of a heat exchanger, as Figure 1 、 Figure 2 shown. It is a connection structure formed by connecting 3 to 6 layers of steam heat exchangers 2 vertically in series. The steam heat exchanger output pipe 4 of the steam heat exchanger 2 at the topmost layer is connected to the top steam drum 8, and then the steam output main pipe 10 is used to parallelly connect the steam drum steam output pipes 9 of the series steam heat exchanger 2 combination structure with N (N≥1) columns horizontally; among them, the heat storage body 1 is arranged on one side of each interlayer steam heat exchanger 2 and is connected to it through an air duct; the steam heat exchanger 2 is a shell-and-tube heat exchanger structure welded by metal finned tubes and has a certain pressure-bearing capacity, placed on one side of the heat storage body 1 and connected to it through an air duct; the combination structure of the series steam heat exchangers 2 is a combination structure in which the steam heat exchanger input pipes 5 and steam heat exchanger output pipes 4 of 3 to 6 layers of steam heat exchangers 2 vertically are sequentially connected in series through connecting pipes 3; the steam drum 8 is placed on the top of 3 to 6 layers of steam heat exchangers 2 vertically and is connected to the top steam heat exchanger output pipe 4 through a connecting pipe 3; the lower header 6 is placed at the bottom of 3 to 6 layers of steam heat exchangers 2 vertically, is connected to the first-layer steam heat exchanger input pipe 5 through a connecting pipe 3, and is connected to the steam drum 8 through a downcomer 7; the makeup water pump 11 is connected to the makeup water pipe 12 at one end and to the lower header 6 at the other end.
[0036] In this embodiment, a first compound connection structure in a heat exchanger compound connection structure is applicable to saturated steam users with a relatively large output flow rate. The original single steam heat exchanger 2 with single control output can be integrated through the first compound connection structure to achieve unified control output of multiple steam heat exchangers 2. That is, after simplifying the control method and control logic, it provides more convenience for later operation and maintenance. The structural method is to connect the steam heat exchanger output pipe 4 of the steam heat exchanger 2 in the first row of the first layer and the steam heat exchanger inlet pipe 5 of the steam heat exchanger 2 in the first row of the second layer in series through a connecting pipe 3, and then connect the steam heat exchanger output pipe 4 of the steam heat exchanger 2 in the first row of the second layer and the steam heat exchanger inlet pipe 5 of the steam heat exchanger 2 in the first row of the third layer in series through a connecting pipe 3. Finally, the steam heat exchanger output pipe 4 of the steam heat exchanger 2 in the first row of the third layer is connected to the top-mounted steam drum 8 through a connecting pipe 3; the steam drum 8 is connected to the bottom-mounted lower header 6 through a downcomer 7, and the lower header 6 is then connected to the steam heat exchanger inlet pipe 5 of the steam heat exchanger 2 in the first row of the first layer through a connecting pipe 3, thus forming a structural form of a natural circulation boiler to achieve single-column integrated output. The connection structures of other columns are the same. Then, the steam output main pipes 10 of the steam drums 8 of each column are connected in parallel to output externally, and the water replenishment side is replenished through the water replenishment pipe 12 by the corresponding water replenishment pumps 11 at the bottom of each column to the lower header 6.
[0037] This embodiment provides a second compound connection structure in a heat exchanger compound connection structure, as Figure 3 、 Figure 4As shown in the figure, a connection structure is formed by horizontally connecting M (M≥3) rows of direct-flow heat exchangers 13 in series and then connecting the series-connected direct-flow heat exchanger combination structures between the vertical layers 1 to 6 in parallel through the main steam output pipe 10. The direct-flow heat exchanger 13 is a shell-and-tube heat exchanger structure welded by metal finned tubes and having a certain pressure-bearing capacity, which is placed on one side of the heat storage body 1 and connected to it through an air duct. Among them, the direct-flow heat exchanger includes a primary heat exchanger 13-1, which is provided with a primary heat exchanger inlet 13-1-1 and a primary heat exchanger outlet 13-1-2, and is placed at the rear end of the secondary heat exchanger 13-2; the secondary heat exchanger 13-2 is provided with a secondary heat exchanger inlet 13-2-1 and a secondary heat exchanger outlet 13-2-2, and is placed at the front end of the primary heat exchanger 13-1, that is, on the side close to the heat storage body 1; the series-connected direct-flow heat exchanger combination structure is a combination structure in which the direct-flow heat exchangers 13 in M (M≥3) horizontal rows between layers are connected in series in turn through the connecting pipe 3. Among them, the series connection method is that the primary heat exchanger inlet 13-1-1 in the first-row direct-flow heat exchanger 13 between layers passes through the primary heat exchanger outlet 13-1-2, and is connected to the primary heat exchanger inlet 13-1-1 in the second-row direct-flow heat exchanger 13 through the connecting pipe 3, and the primary heat exchangers 13-1 in the Mth direct-flow heat exchanger 13 between layers are connected in series in turn. Then, the primary heat exchanger outlet 13-1-2 in the Mth-row direct-flow heat exchanger 13 is connected to the secondary heat exchanger inlet 13-1-1 through the connecting pipe 3. Finally, the secondary heat exchangers 13-2 are connected in series in reverse according to the series connection mode of the primary heat exchanger 13-1 to form a combined structure in which the primary heat exchangers 13-1 of the direct-flow heat exchangers 13 between layers are first connected in series and then connected in series with the secondary heat exchangers 13-2 in turn. The total inlet and total outlet of the combined structure are the primary heat exchanger inlet 13-1-1 and the secondary heat exchanger outlet 13-2-2 in the first-row direct-flow heat exchanger 13 between layers respectively; the makeup water pump 11 is connected to the makeup water pipe 12 on one side and to the primary heat exchanger inlet 13-1 in the first-row direct-flow heat exchanger 13 between layers on the other side.
[0038] In this embodiment, the second compound connection structure in a compound connection structure of a heat exchanger is applicable to wet saturated steam users specialized for heavy oil exploitation in oil fields. It can integrate the original single-unit controlled output direct-flow heat exchanger 13 through the second compound connection structure, achieving the series connection and unified controlled output of multiple direct-flow heat exchangers 13. Under the calibrated parameters of the output steam, it can increase the cross-sectional area of a single heat exchange tube, preventing problems such as the heat exchange tube being too thin and easily blocked, which affect the service life of the direct-flow heat exchanger 13. Moreover, after integration through the second compound connection structure, the control method and control logic of the complete set of equipment are simplified, providing more convenience for later operation and maintenance. Its structural method is to connect the primary heat exchanger outlet 13-1-2 of the first-row first-column direct-flow heat exchanger 13 on the first layer in series with the primary heat exchanger inlet 13-1-1 of the first-row second-column direct-flow heat exchanger 13 on the first layer through the connecting pipe 3, and then successively connect the primary heat exchanger outlet 13-1-2 of the first-row second-column direct-flow heat exchanger 13 in series with the primary heat exchanger inlet 13-1-1 of the first-row M-column direct-flow heat exchanger 13 on the first layer through the connecting pipe 3. Then, connect the primary heat exchanger outlet 13-1-2 of the first-row M-column direct-flow heat exchanger 13 on the first layer to its secondary heat exchanger inlet 13-2-1 through the connecting pipe 3. According to the series connection mode of the primary heat exchanger 13-1 of the first-layer direct-flow heat exchanger 13, the secondary heat exchanger 13-2 of the first-layer direct-flow heat exchanger 13 is also connected in series to form a same-layer horizontal series connection structure mode. The series connection mode between other layers is the same as that of the first layer. In this way, the total inlet and total outlet of each layer are respectively the primary heat exchanger inlet 13-1-1 and the secondary heat exchanger outlet 13-2-2 in the first-column direct-flow heat exchanger 13 between layers. A set of makeup water pumps 11 is set between each layer, and water is replenished into the column through the makeup water pipe 12, thus forming a direct-flow boiler with the layer between layers as a unit for output. Then, the secondary heat exchanger outlets 13-2-2 of the first-column direct-flow heat exchangers between each layer are connected in parallel through the steam output main pipe 10 for external output. For some special sites, the M-column direct-flow heat exchangers 13 of the vertical 1 to 6 layers can be connected in series to form a steam output structure.
[0039] The above-mentioned compound connection structure of a heat exchanger is suitable for producing saturated steam with a certain water content. If the water content of the output steam is too high, a steam-water separation device can be adapted to improve the steam dryness; the output saturated steam can pass through a superheater to produce superheated steam.
[0040] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.
Claims
1. A compound connection structure of a heat exchanger, characterized in that, It includes a compound connection structure one and a compound connection structure two; The described compound connection structure one includes: A connection structure in which 3 to 6 vertical steam heat exchangers are connected in series and then connected to the top steam drum, and then the single-row series heat exchanger combination structures of N columns in the horizontal direction are connected in parallel through the main steam output pipeline, where N≥1; A heat storage body, which is made of refractory sintered bricks and has a structure integrating electric energy heat storage and heat energy release inside, is placed on one side of the steam heat exchanger and is connected to the steam heat exchanger; A steam heat exchanger, which is welded by metal finned tubes, is provided with a steam heat exchanger input pipe and a steam heat exchanger output pipe, is placed on one side of the heat storage body and is connected to the heat storage body; A steam drum, which is placed on the top of the vertical top-layer steam heat exchanger and is connected to the top-layer steam heat exchanger output pipe through a connecting pipe; A lower header, which is placed at the bottom of 3 to 6 vertical steam heat exchangers, is connected to the first-layer steam heat exchanger input pipe through a connecting pipe, and is connected to the steam drum through a downcomer; The described compound connection structure two includes: A connection structure in which M columns of horizontal once-through heat exchangers are connected in series and then the series once-through heat exchanger combination structures of each of the 1 to 6 vertical layers are connected in parallel through the main steam output pipeline, where M≥3; A heat storage body, which is made of refractory sintered bricks and has a structure integrating electric energy heat storage and heat energy release inside, is placed on one side of the heat exchanger and is connected to the heat exchanger; An once-through heat exchanger, which is welded by metal finned tubes, is placed on one side of the heat storage body and is connected to the heat storage body; Among them, the described once-through heat exchanger includes: A primary heat exchanger, a low-temperature heat exchanger provided with a primary heat exchanger inlet and a primary heat exchanger outlet, is arranged at the rear end of the secondary heat exchanger; A secondary heat exchanger, a high-temperature heat exchanger provided with a secondary heat exchanger inlet and a secondary heat exchanger outlet, is arranged at the front end of the primary heat exchanger, that is, on the side close to the heat storage body.
2. The compound connection structure of a heat exchanger according to claim 1, characterized in that, It also includes: A series steam heat exchanger combination structure, which is arranged in the compound connection structure one and is a combination structure in which the steam heat exchanger input pipes and steam heat exchanger output pipes of 3 to 6 vertical steam heat exchangers are sequentially connected in series through connecting pipes; A series combination structure of once-through heat exchangers, which is arranged in the compound connection structure two and is a combination structure in which M horizontally adjacent columns of once-through heat exchangers in the horizontal layer are sequentially connected in series through connecting pipes. Among them, the series connection method is that the primary heat exchanger inlet in the first column of once-through heat exchangers in the layer is connected to the primary heat exchanger inlet in the second column of once-through heat exchangers through the primary heat exchanger outlet, and is sequentially connected in series to the primary heat exchanger inlet in the Mth column of once-through heat exchangers in this layer. Then, the primary heat exchanger outlet in the Mth column of once-through heat exchangers is connected to the secondary heat exchanger inlet, and the secondary heat exchangers are reversely connected in series in accordance with the series mode of the primary heat exchangers, forming a combination structure in which the primary heat exchangers in the once-through heat exchangers in this layer are sequentially connected in series first and then the secondary heat exchangers are sequentially connected in series again; the total inlet of the combination structure is the primary heat exchanger inlet of the first column of once-through heat exchangers, and the total outlet is the secondary heat exchanger outlet of the first column of once-through heat exchangers.
3. A compound connection structure of a heat exchanger according to claim 1, characterized in that, It also includes: A make-up water pump; When it is arranged in the compound connection structure one, one end of the make-up water pump is connected to the make-up water pipeline, and the other end is connected to the lower header; When installed in the double connection structure II, one end of the make-up water pump is connected to the make-up water pipeline, and the other end is connected to the inlet of the primary heat exchanger in the first row of direct current heat exchangers between floors.