Finned tube heat transfer enhancement structure for a waste heat recovery device

Abstract

The utility model discloses a kind of finned tube heat transfer enhancement structure for waste heat recovery device, it is related to finned tube technical field, including heat exchange bin, the inside fixed mounting of heat exchange bin has finned tube main body, finned tube main body includes liquid conduit and several radiating fins, the inside of radiating fin is equipped with several through holes, liquid conduit is sequentially penetrated in the through hole of several radiating fins inside, the side of heat exchange bin inner wall is fixedly connected with several airflow baffles in linear arrangement mode, one end of several airflow baffles is respectively arranged between two adjacent radiating fins.The utility model changes the flow direction of high-temperature gas by the setting of airflow baffle, forms turbulent flow, reduces flow rate, prolongs the residence time of airflow, promotes gas and radiating fin to contact fully, enhances the convection heat transfer of this finned tube.

Description

Technical Field

[0001] This utility model relates to the field of finned tube technology, and in particular to a finned tube enhanced heat transfer structure for a waste heat recovery device. Background Technology

[0002] Finned tubes for waste heat recovery devices are heat exchange elements that enhance heat transfer efficiency by setting finned extension structures on the surface of a base tube. The base tube is usually made of steel, copper, or stainless steel. The fins can be combined with the base tube by processes such as rolling, welding, or winding. By increasing the heat exchange area, the heat transfer rate between the fluid (gas or liquid) and the tube wall is improved. They are mainly used in industrial waste heat recovery systems to transfer the heat of high-temperature fluids (such as boiler exhaust gas and industrial waste steam) to low-temperature media (such as water and air), realizing the recovery and reuse of waste heat. They have the characteristics of compact structure, high heat transfer performance, and strong applicability, which can effectively improve energy utilization and reduce system energy consumption.

[0003] When high-temperature gas passes through the heat exchange chamber at excessively high flow rates, its actual residence time inside the chamber is significantly reduced, making it difficult to form a sufficient and continuous heat exchange interface with the heat sink surface. This violates the design goal of the waste heat recovery device to improve energy efficiency by increasing the contact area. Furthermore, the excessive airflow scouring force may exacerbate the mechanical wear of the heat sink, further affecting the long-term stable operation of the equipment. Utility Model Content

[0004] The purpose of this invention is to solve the problem in the prior art where the high-temperature gas flow rate is too fast, resulting in insufficient contact with the heat sink on the outside of the finned tube and thus reduced heat transfer efficiency. The invention proposes a finned tube enhanced heat transfer structure for a waste heat recovery device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a finned tube enhanced heat transfer structure for a waste heat recovery device, comprising a heat exchange chamber, a finned tube body fixedly installed inside the heat exchange chamber, the finned tube body comprising a liquid conduit and a plurality of heat sinks, a plurality of through holes being opened inside the heat sinks, the liquid conduit sequentially passing through the through holes inside the plurality of heat sinks, a plurality of airflow baffles being fixedly connected to one side of the inner wall of the heat exchange chamber in a linear arrangement, one end of the plurality of airflow baffles being respectively disposed between two adjacent heat sinks.

[0006] Preferably, several heat sinks are fixedly connected to the other side of the inner wall of the heat exchange chamber.

[0007] Preferably, a cover plate is fixedly connected to both sides of the heat exchange chamber, and a ventilation slot is fixedly connected to one side of the cover plate.

[0008] Preferably, a gas screen is fixedly installed inside the ventilation slot.

[0009] Preferably, the outer surface of the gas screen is coated with a high-temperature resistant non-stick layer.

[0010] Preferably, the heat exchange chamber is fixedly connected to two sides of mounting side plates, and mounting holes are opened at both ends of the mounting side plates.

[0011] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0012] 1. In this utility model, the flow direction of high-temperature gas is changed by setting the airflow baffle, forming turbulence, reducing the flow velocity, extending the residence time of the airflow, promoting full contact between the gas and the heat sink, and enhancing the convective heat transfer of the finned tube.

[0013] 2. In this utility model, the gas screen effectively blocks solid particles carried in the airflow to the windward side of the screen through a physical interception mechanism, preventing particles from entering the heat exchange chamber and interfering with the heat transfer process or causing wear on components such as finned tubes. The high-temperature resistant non-stick coating on the surface of the gas screen has multiple advantages: First, it maintains stable chemical properties in high-temperature environments, preventing the coating from decomposing or carbonizing due to high temperatures, ensuring long-term safety; second, its extremely low surface energy characteristics prevent molten or semi-solid particles from adhering to the screen surface, avoiding screen clogging caused by material accumulation and effectively maintaining ventilation efficiency. Attached Figure Description

[0014] Figure 1 This utility model provides a three-dimensional structural diagram of a finned tube enhanced heat transfer structure for a waste heat recovery device.

[0015] Figure 2 This utility model presents a three-dimensional structural diagram of the internal structure of a finned tube enhanced heat transfer structure for a waste heat recovery device.

[0016] Figure 3 This utility model provides a three-dimensional structural diagram of the finned tube body in a finned tube enhanced heat transfer structure for a waste heat recovery device.

[0017] Figure 4 This invention presents a three-dimensional structural diagram of the cover plate in a finned tube enhanced heat transfer structure for a waste heat recovery device.

[0018] Legend: 1. Heat exchange chamber; 11. Airflow baffle; 12. Mounting side plate; 121. Mounting hole; 2. Finned tube body; 21. Liquid conduit; 22. Heat sink; 221. Through hole; 3. Cover plate; 31. Ventilation slot; 32. Gas screen. Detailed Implementation

[0019] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0021] Example 1: As Figures 1-4 As shown, this utility model provides a finned tube enhanced heat transfer structure for a waste heat recovery device, including a heat exchange chamber 1. A finned tube body 2 is fixedly installed inside the heat exchange chamber 1. The finned tube body 2 includes a liquid conduit 21 and several heat sinks 22. Several through holes 221 are opened inside the heat sinks 22. The liquid conduit 21 passes through the through holes 221 inside the heat sinks 22 in sequence. Several airflow baffles 11 are fixedly connected to one side of the inner wall of the heat exchange chamber 1 in a linear arrangement. One end of the several airflow baffles 11 is respectively set between two adjacent heat sinks 22. The several heat sinks 22 are fixedly connected to the other side of the inner wall of the heat exchange chamber 1.

[0022] The specific setup and function of this embodiment are described below. After the high-temperature exhaust gas is introduced into the heat exchange chamber 1, it first collides with the airflow baffle 11. The airflow baffle 11 changes the direction of fluid flow, causing the high-speed airflow to form a turbulent zone between adjacent baffles, thereby reducing the mainstream velocity and increasing the residence time. The decelerated airflow is forced to be evenly distributed to the gaps between each heat sink 22, forming a thin-layer flow state. At this time, the high-temperature gas is in full contact with the large surface area of ​​the heat sink 22, and the heat is transferred to the heat sink 22 through convection heat transfer. The heat sink 22, as a highly efficient heat conduction medium, quickly conducts the heat to the internal liquid conduit 21, where it is absorbed and carried away by the water flowing inside the conduit, ultimately realizing the recovery and utilization of waste heat. By setting the airflow baffle 11 to change the direction of high-temperature gas flow, forming turbulence, reducing the flow velocity, and extending the residence time of the airflow, the gas is made to fully contact the heat sink 22, enhancing the convective heat transfer of the finned tube.

[0023] Example 2: Figures 1-4As shown, the waste heat recovery device of this utility model uses a finned tube enhanced heat transfer structure, including a heat exchange chamber 1. A finned tube body 2 is fixedly installed inside the heat exchange chamber 1. The finned tube body 2 includes a liquid conduit 21 and several heat sinks 22. Several through holes 221 are opened inside the heat sinks 22. The liquid conduit 21 passes through the through holes 221 inside the heat sinks 22 in sequence. Several airflow baffles 11 are fixedly connected to one side of the inner wall of the heat exchange chamber 1 in a linear arrangement. One end of the several airflow baffles 11 is respectively set between two adjacent heat sinks 22. Cover plates 3 are fixedly connected to both sides of the heat exchange chamber 1. A ventilation groove 31 is fixedly connected to one side of the cover plate 3. A gas screen 32 is fixedly installed inside the ventilation groove 31. The outer surface of the gas screen 32 is coated with a high temperature resistant non-stick layer. Mounting side plates 12 are fixedly connected to both sides of the heat exchange chamber 1. Mounting holes 121 are opened at both ends of the mounting side plates 12.

[0024] The overall effect of this embodiment is that by sequentially passing bolts of the appropriate specifications through the mounting holes 121 on the mounting side plate 12, the mounting side plate 12 is mechanically fastened to securely fix it to the target installation area, thereby completing the reliable installation of the entire heat transfer structure. During system operation, the high-temperature gas delivery pipeline is fixedly connected to the ventilation slot 31 on the heat exchange chamber 1 through a sealed connection, ensuring that the high-temperature gas can be directionally and efficiently introduced into the heat exchange chamber 1 to participate in heat exchange.

[0025] When high-temperature gas flows through the ventilation slot 31, the gas screen 32 effectively blocks solid particles carried in the airflow to the windward side of the screen through a physical interception mechanism, preventing particles from entering the heat exchange chamber 1 and interfering with the heat transfer process or causing wear on components such as finned tubes. The high-temperature resistant non-stick coating on the surface of the gas screen 32 has multiple advantages: First, it maintains stable chemical properties in high-temperature environments, preventing the coating from decomposing or carbonizing due to high temperatures, ensuring long-term safety; second, its extremely low surface energy characteristics prevent molten or semi-solid particles from adhering to the screen surface, avoiding screen clogging caused by material accumulation and effectively maintaining ventilation efficiency.

[0026] The operating principle and usage of this device are as follows: After the high-temperature waste gas is introduced into the heat exchange chamber 1, it first collides with the airflow baffle 11. The airflow baffle 11 changes the direction of fluid flow, causing the high-speed airflow to form a turbulent zone between adjacent baffles, thereby reducing the mainstream velocity and increasing the residence time. The decelerated airflow is forced to be evenly distributed to the gaps between each heat sink 22, forming a thin-layer flow state. At this time, the high-temperature gas is in full contact with the large surface area of ​​the heat sink 22, and heat is transferred to the heat sink 22 through convection heat transfer. The heat sink 22, as a highly efficient heat transfer medium, quickly conducts the heat to the internally penetrating liquid conduit 21, where it is absorbed and carried away by the water flowing inside the conduit, ultimately achieving the recovery and utilization of waste heat.

[0027] By sequentially passing the appropriate bolts through the mounting holes 121 on the mounting side plate 12, the mounting side plate 12 is mechanically fastened to securely fix it to the target installation area, thus completing the reliable installation of the entire heat transfer structure. During system operation, the high-temperature gas delivery pipeline is fixedly connected to the ventilation slot 31 on the heat exchange chamber 1 through a sealed connection, ensuring that the high-temperature gas can be directionally and efficiently introduced into the heat exchange chamber 1 to participate in heat exchange.

[0028] When high-temperature gas flows through ventilation slot 31, gas screen 32 effectively blocks solid particles carried in the airflow to the windward side of the screen through a physical interception mechanism.

[0029] The above are merely preferred embodiments of this utility model and are not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from the technical solution of this utility model shall still fall within the protection scope of this utility model.

Claims

1. A finned tube enhanced heat transfer structure for a waste heat recovery device, comprising a heat exchange chamber (1), wherein a finned tube body (2) is fixedly installed inside the heat exchange chamber (1), characterized in that: The finned tube body (2) includes a liquid conduit (21) and several heat sinks (22). Several through holes (221) are opened inside the heat sinks (22). The liquid conduit (21) passes through the through holes (221) inside the heat sinks (22) in sequence. Several airflow baffles (11) are fixedly connected to one side of the inner wall of the heat exchange chamber (1) in a linear arrangement. One end of the several airflow baffles (11) is respectively set between two adjacent heat sinks (22).

2. The finned tube enhanced heat transfer structure for a waste heat recovery device according to claim 1, characterized in that: Several heat sinks (22) are fixedly connected to the other side of the inner wall of the heat exchange chamber (1).

3. The finned tube enhanced heat transfer structure for a waste heat recovery device according to claim 1, characterized in that: The heat exchange chamber (1) is fixedly connected to the two sides of the cover plate (3), and the cover plate (3) is fixedly connected to the ventilation slot (31) on one side.

4. The finned tube enhanced heat transfer structure for a waste heat recovery device according to claim 3, characterized in that: A gas screen (32) is fixedly installed inside the ventilation slot (31).

5. The finned tube enhanced heat transfer structure for a waste heat recovery device according to claim 4, characterized in that: The outer surface of the gas screen (32) is coated with a high-temperature resistant non-stick layer.

6. The finned tube enhanced heat transfer structure for a waste heat recovery device according to claim 1, characterized in that: The heat exchange chamber (1) is fixedly connected to two sides of the mounting side plate (12), and mounting holes (121) are opened at both ends of the mounting side plate (12).

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