Longitudinal honeycomb finned tube

Abstract

The utility model relates to a kind of longitudinal honeycomb finned tube in finned tube technical field, including base pipe base pipe is equipped with longitudinal fin one and longitudinal fin two;Fin one, fin two are made by hot rolling with base pipe, the height of fin one is greater than the height of fin two, multiple fin one and fin two are staggered distribution along the axial direction of base pipe, and there are ventilation holes on fin one and fin two. The height of fin one and fin two is different, increase the heat transfer contact area between fluid and fin, improve the heat transfer performance, when material airflow flows through fin one and fin two, boundary layer separation occurs in upper portion, form low-speed wake vortex area, fluid flows through ventilation hole, produce velocity disturbance in the axial direction of base pipe, increase airflow kinetic energy, delay flow separation, reduce tail backflow area, improve anti-ash performance. The utility model is compact in overall structure, and heat transfer area is large, heat transfer performance is good, improve heat exchange efficiency, wear resistance and good anti-ash performance.

Description

Technical Field

[0001] This utility model belongs to the field of finned tube technology, specifically relating to a longitudinal honeycomb finned tube. Background Technology

[0002] Finned tubes are an important component of boiler radiators, and currently, spiral finned tubes and longitudinal finned tubes are most commonly used. Longitudinal finned tubes are characterized by fins extending along the length of the tube, forming a finned structure. This design helps improve heat exchange efficiency, but may have some problems with ash accumulation and wear. For example, in the curved flue gas ducts formed by the fins to enhance heat transfer conditions, the flue gas velocity field is high in the middle and low at the sides. Combined with the influence of the temperature field, the flow velocity in the middle of the flue gas duct will be even higher, increasing the turbulence of the airflow between the fins, causing flow boundary layer separation and periodic development, thinning the flow boundary layer and thermal boundary layer on the fins, shortening the laminar flow boundary layer length, and helping to disrupt the laminar sublayer of the boundary layer, thereby enhancing heat transfer. However, because the fins of longitudinal finned tubes are welded to the ash-accumulating windward and back sides, the airflow flows along the fins and changes direction at the tube, forming vortices, making some areas prone to ash accumulation. Circular finned tubes generate significant resistance to airflow during operation, which leads to increased energy consumption of fans or other ventilation equipment, potentially affecting the overall operating efficiency of the equipment and increasing operating costs. Longitudinal finned tubes and spiral finned tubes have many shortcomings in terms of wear resistance, heat transfer performance, and dust accumulation prevention. Therefore, there is an urgent need for a longitudinal honeycomb finned tube to solve the above-mentioned technical problems. Utility Model Content

[0003] The purpose of this utility model is to address the shortcomings of existing technologies by providing a longitudinal honeycomb finned tube, including a base tube (heat-receiving surface tube), on which longitudinal fins one and two are provided; fins one and two are hot-rolled with the base tube (integrated molding), the base tube, fins one and two are a single unit, fins one and two have a large contact area with the base tube, and fins one and two have good thermal conductivity and high efficiency, fundamentally eliminating contact thermal resistance and improving heat transfer efficiency; the height of fins one is greater than the height of fins two, and multiple fins one and two are staggered along the axial direction of the base tube, and ventilation holes are distributed on fins one and two. The different heights of fin one and fin two increase the heat transfer contact area between the fluid and the fins, improving heat transfer performance. Ventilation holes are machined on the surfaces of fin one and fin two. When the material flow around fin one and fin two, boundary layer separation occurs at the upper part of fin one and fin two, forming a low-speed wake vortex region. The fluid flowing through the ventilation holes on the surfaces of fin one and fin two generates velocity disturbance in the axial direction of the base tube, increasing airflow kinetic energy, delaying flow splitting, and reducing the tail recirculation zone, thereby improving the finned tube's resistance to dust accumulation. The diameter and density of the ventilation holes can be changed as needed, ensuring the overall integrity without affecting the wear resistance and service life of fin one and fin two.

[0004] Preferably, both fin one and fin two are circular fins. The shape of fin one and fin two also helps to improve the heat transfer coefficient and accelerate the heat transfer rate.

[0005] Preferably, the plurality of ventilation holes are evenly distributed on fin one and fin two.

[0006] Preferably, the base tube is divided into multiple equal flow ventilation zones along the tube axis. Each equal flow ventilation zone includes at least one set of adjacent fin one and fin two. Fin one and fin two are paired together. Each set of fins divides the surface space into several small equal flow ventilation zones, which has a uniform flow effect on flue gas and has good anti-dust accumulation performance and good wear resistance.

[0007] Preferably, the fin length between adjacent fin one and fin two is greater than the height difference between fin one and fin two. This ensures a compact structure, increases the heat exchange area of ​​the base tube (heat-receiving surface tube), increases the heat transfer contact area between the fluid and fin one and fin two, and improves heat transfer performance.

[0008] Preferably, the ventilation holes are distributed in a honeycomb pattern on fin one and fin two, similar to the distribution of through holes on a honeycomb briquette ball.

[0009] Working Principle: Fin 1 and Fin 2 are hot-rolled together with the base tube, forming a single unit. Fin 1 and Fin 2 have a large contact area with the base tube, exhibiting excellent thermal conductivity and high efficiency, fundamentally eliminating contact thermal resistance and improving heat transfer efficiency. Ventilation holes are machined on the surfaces of Fin 1 and Fin 2. When the material flow around Fin 1 and Fin 2, boundary layer separation occurs at the upper part of Fin 1 and Fin 2, forming a low-speed wake vortex region. The fluid flowing through the ventilation holes on the surfaces of Fin 1 and Fin 2 generates velocity disturbance in the axial direction of the base tube, increasing airflow kinetic energy, delaying flow splitting, and reducing the tail recirculation zone, thereby improving the finned tube's resistance to dust accumulation. Simultaneously, the diameter and density of the ventilation holes can be adjusted as needed, ensuring the integrity of the unit without affecting the wear resistance and service life of Fin 1 and Fin 2. The integral longitudinal honeycomb finned tube takes into account the fact that the flue gas velocity field in the flue is high in the middle and low at the sides, and the flow velocity in the middle of the flue will be even higher due to the influence of the temperature field. Fins one and two are arranged in an alternating height configuration. The height of each fin can be appropriately increased, and the fin spacing can be appropriately shortened as needed. This increases the heat transfer contact area between the fluid and fins one and two, improving heat transfer performance. Each group of fins divides the surface space into several small areas (uniform flow ventilation areas), which has a uniform flow effect on the flue gas, and provides good resistance to dust accumulation and wear. The cost is relatively low compared to a tube body, and it has good wear resistance and a long service life.

[0010] This utility model has the following advantages: it has a compact overall structure, a large heat transfer area, good heat transfer performance, improved heat exchange efficiency, good wear resistance and anti-dust accumulation performance, low manufacturing and use costs, and high economic benefits. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 This is a schematic diagram of the structure of a longitudinal honeycomb finned tube in an embodiment of this utility model; Figure 2 This is a schematic diagram of the structure of fin one and base tube in an embodiment of this utility model.

[0013] In the diagram: 1. Base tube; 2. Fin 1; 3. Fin 2; 4. Ventilation hole; 5. Uniform flow ventilation area. Detailed Implementation

[0014] The present invention will now be clearly described with reference to the accompanying drawings and specific embodiments. This description is merely for explaining the present invention and is not intended to limit it. Any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art based on the embodiments of the present invention without inventive effort to obtain all other embodiments should be included within the protection scope of the present invention.

[0015] Example 1 like Figure 1 As shown, this utility model provides a longitudinal honeycomb finned tube, including a base tube 1 (heat-receiving surface tube), on which longitudinal fins 1-2 and longitudinal fins 2-3 are provided; the fins 1-2 and fins 2-3 are hot-rolled with the base tube 1, and the base tube 1, fins 1-2 and fins 2-3 are an integral whole. The fins 1-2 and fins 2-3 have a large contact area with the base tube 1, and the fins 1-2 and fins 2-3 have good thermal conductivity and high efficiency, fundamentally eliminating contact thermal resistance and improving heat transfer efficiency; the height of fins 1-2 is greater than the height of fins 2-3, and multiple fins 1-2 and fins 2-3 are staggered along the axial direction of the base tube 1, and ventilation holes 4 are distributed on each of the fins 1-2 and fins 2-3. The different heights of fin 1 (2) and fin 2 (3) increase the heat transfer contact area between the fluid and the fins, improving heat transfer performance. Ventilation holes 4 are machined on the surfaces of fin 1 (2) and fin 2 (3). When the material flow around fin 1 (2) and fin 2 (3), boundary layer separation occurs at the upper part of fin 1 (2) and fin 2 (3), forming a low-speed wake vortex region. The fluid flowing through the ventilation holes 4 on the surfaces of fin 1 (2) and fin 2 (3) generates velocity disturbance in the axial direction of the base tube, increasing airflow kinetic energy, delaying flow splitting, and reducing the tail recirculation zone, thereby improving the finned tube's resistance to dust accumulation. The diameter and density of the ventilation holes 4 can be changed as needed, ensuring the overall integrity without affecting the wear resistance and service life of fin 1 (2) and fin 2 (3).

[0016] The multiple ventilation holes 4 are evenly distributed on fin 1 2 and fin 2 3.

[0017] The base tube is divided into multiple equal flow ventilation zones 5 along the tube axis. Each equal flow ventilation zone includes at least one set of adjacent fin 1 2 and fin 2 3. Fin 1 2 and fin 2 3 are paired together. Each set of fins divides the surface space into several small equal flow ventilation zones 5, which have a uniform flow effect on flue gas and have good anti-dust accumulation performance and good wear resistance.

[0018] Example 2 like Figure 1-2 As shown, the difference between this embodiment and Embodiment 1 is that both fin 2 and fin 3 are circular fins. The shape of fin 2 and fin 3 also helps to improve the heat transfer coefficient and accelerate the heat transfer rate.

[0019] The fin length between adjacent fins 1-2 and fin 2-3 is greater than the height difference between fins 1-2 and fin 2-3. This ensures a compact structure, increases the heat exchange area of ​​the base tube 1 (heat-receiving surface tube), increases the heat transfer contact area between the fluid and fins 1-2 and fin 2-3, and improves heat transfer performance.

[0020] The ventilation holes are distributed in a honeycomb pattern on fin one and fin two, similar to the distribution of through holes on a honeycomb briquette ball.

[0021] In the above implementation examples, the base pipe and other components are conventional equipment in this field and are existing technologies. This application does not make any improvements to them, but only utilizes their existing functions. For their specific structure and principles, please refer to the product manual or existing technical documents, which will not be repeated here.

[0022] The embodiments of this utility model have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A longitudinal honeycomb finned tube, comprising a base tube, wherein the base tube is provided with fin one and fin two; characterized in that: The fin one and fin two are hot rolled together with the base tube. The height of fin one is greater than the height of fin two. Multiple fins one and fin two are staggered along the axial direction of the base tube. Ventilation holes are distributed on fin one and fin two.

2. The longitudinal honeycomb finned tube according to claim 1, characterized in that: Both fin one and fin two are circular fins.

3. A longitudinal honeycomb finned tube according to claim 1, characterized in that: The ventilation holes are evenly distributed on fin one and fin two.

4. A longitudinal honeycomb finned tube according to claim 1, characterized in that: The base tube is divided into multiple equal flow ventilation zones along the tube axis, and each equal flow ventilation zone includes at least one set of adjacent fin one and fin two.

5. A longitudinal honeycomb finned tube according to claim 1, characterized in that: The wing length between adjacent fin one and fin two is greater than the height difference between fin one and fin two.

6. A longitudinal honeycomb finned tube according to claim 1, characterized in that: The ventilation holes are distributed in a honeycomb pattern on fin one and fin two.

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