Heat pipe for waste heat boiler

Abstract

The utility model discloses a kind of heat pipes for waste heat boiler, comprising: shell, tube sheet, fin, shell has inner cavity, inner cavity is filled with heat exchange medium, tube sheet is connected in the outer wall of shell middle part, tube sheet is used to install shell in waste heat boiler, fin is connected to shell outer wall, fin surface is equipped with several cyclone pits, cyclone pit is equipped with cyclone structure. When airflow passes through, cyclone effect is generated by cyclone pit, and the flow direction of gas is further changed by cyclone structure in pit, so that gas rotates and flows, thereby the heat exchange effect is strengthened.

Description

Technical Field

[0001] This utility model relates to the field of heat pipe technology, and in particular to a heat pipe with fins that can create a vortex effect in gas. Background Technology

[0002] In the field of waste heat recovery technology, heat pipes, as a highly efficient phase change heat transfer element, have become a core component for improving energy utilization efficiency. Essentially, they are closed two-phase heat transfer systems that achieve heat transfer through the evaporation-condensation cycle of the working fluid inside the pipe shell: when the evaporation section of the heat pipe absorbs heat from the high-temperature flue gas, the internal working fluid vaporizes to form steam, which flows to the condensation section under a slight pressure difference; after releasing heat in the condensation section, the steam re-liquefies, and the liquid working fluid flows back to the evaporation section through a capillary wick structure, completing a continuous phase change heat transfer cycle.

[0003] Currently, the heat pipe structure in waste heat boilers mainly consists of a shell and fins. The shell is filled with a heat exchange medium, which is generally double-distilled water or ethanol. The fins are arranged around the outer wall of the shell. Existing fins are usually continuous flat plate structures, and gas flows away quickly as it passes through the fin surface, resulting in relatively low heat exchange efficiency. Utility Model Content

[0004] This application provides a heat pipe for a waste heat boiler. By modifying the fins, a vortex effect can be generated when the gas flows over the fin surface, thereby improving the heat exchange efficiency.

[0005] This application provides a heat pipe for a waste heat boiler, including:

[0006] The tube shell has an inner cavity filled with a heat exchange medium;

[0007] A tube sheet is connected to the outer wall of the middle part of the tube shell, and the tube sheet is used to install the tube shell in the waste heat boiler;

[0008] Fins are connected to the outer wall of the tube shell. The surface of the fins is provided with a plurality of swirling pits, and swirling structures are provided in the swirling pits.

[0009] The beneficial effect of the above embodiments is that when the airflow passes through the swirling pit, a swirling flow is generated, and the swirling structure in the pit further changes the gas flow direction, causing the gas to rotate and flow further, thereby enhancing the heat exchange effect.

[0010] Based on the above embodiments, the embodiments of this application can be further improved as follows:

[0011] In one embodiment of this application, a groove is provided axially in the inner cavity. The beneficial effect of this step is that the groove increases the heat exchange area, thereby improving the heat exchange effect.

[0012] In one embodiment of this application, the fin has a notch. The beneficial effect of this step is to reduce the accumulation height of soot on the fin surface.

[0013] In one embodiment of this application: the notch forms a radial structure in the fin.

[0014] In one embodiment of this application: the swirling structure includes: swirling grooves and swirling protrusions. The swirling pit has a central swirling protrusion, and the swirling pit has multiple swirling grooves around its perimeter. The swirling grooves extend from the edge of the swirling pit towards the swirling protrusions. The beneficial effects of this step are: the swirling grooves guide the gas to flow into the swirling pit, thereby enhancing the vortex effect within the swirling pit. Simultaneously, the central swirling protrusion can, on the one hand, block the direct outflow of air, increasing the residence time of the gas in the swirling pit, and on the other hand, guide the gas along the surface of the swirling protrusion, further enhancing the vortex effect and improving the heat exchange efficiency of the gas.

[0015] In one embodiment of this application: the swirl groove forms an arc-shaped flow channel in the swirl recess. The beneficial effect of this step is that the arc-shaped flow channel structure enhances the rotation effect of the airflow, thereby strengthening the vortex effect generated by the gas.

[0016] In one embodiment of this application, the swirling protrusion is a convex arc-shaped structure. The beneficial effect of this step is that the arc-shaped protrusion enhances the rotational effect of the airflow, thereby strengthening the vortex effect generated by the gas.

[0017] In one embodiment of this application, an annular guide channel is formed between the swirling protrusion and the end of the swirling groove. The beneficial effect of this step is that the annular guide channel collects the gas flowing out of the swirling groove and causes the airflow to rotate along the guide channel, which can enhance the vortex effect generated by the gas. Simultaneously, as the gas moves to the other side, it is also rotated and ejected through the swirling groove on the other side, thereby improving the heat exchange effect.

[0018] In one embodiment of this application, the swirling structure includes a swirling groove, which is a spiral groove extending from the edge of the swirling pit towards the center. The beneficial effect of this step is that the spiral groove makes it easier for gas to form a spiral airflow when flowing through the swirling pit, thereby improving the vortex effect. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0020] Figure 1 A schematic diagram of the structure of a heat pipe for a waste heat boiler;

[0021] Figure 2 This is a schematic diagram of the fin structure;

[0022] Figure 3 This is a schematic diagram of the swirl pit structure in Example 1;

[0023] Figure 4 This is a schematic diagram of the swirling pit structure in Example 2.

[0024] The components include: 1. Tube shell, 101. Inner cavity, 102. Groove; 2. Tube sheet; 3. Fins, 301. Swirl pit, 302. Notch, 303. Swirl groove, 304. Swirl protrusion, 305. Guide channel; 4. Heat exchange medium. Detailed Implementation

[0025] In this application, unless otherwise expressly specified and limited, the terminology used should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of different terms in this utility model according to the specific circumstances, and the scope of the specific meaning should be limited to achieving the function of this application.

[0026] In the description of this application, it should be understood that the directional terms or positional relationships described are based on the orientation or positional relationships shown in the accompanying drawings, or based on the orientation or positional relationships in actual use, and are only for the purpose of facilitating the description of the contents of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] Example 1

[0028] like Figure 1-3 As shown, a heat pipe for a waste heat boiler includes: a shell 1, a tube sheet 2, and fins 3. The shell 1 has an inner cavity 101 filled with a heat exchange medium 4. The tube sheet 2 is connected to the outer wall of the middle part of the shell 1 and is used to install the shell 1 in a waste heat boiler. The fins 3 are connected to the outer wall of the shell 1, and the surface of the fins 3 is provided with a plurality of swirling pits 301, in which swirling structures are arranged.

[0029] Specifically, such as Figure 1As shown, the tube shell 1 includes: a tube body and end caps. The end caps are located at both ends of the tube body and seal both ends of the tube body. The heat exchange medium 4 is filled in the inner cavity 101. The heat exchange medium 4 is a substance such as double-distilled water or ethanol. The tube sheet 2 is connected to the outer wall of the tube shell 1. The tube sheet 2 is fitted with a sealing ring. The upper outer circumference of the tube sheet 2 has a limiting boss. The tube sheet 2 is inserted into the corresponding through hole of the waste heat boiler and sealed by the sealing ring and limited by the limiting boss. It can be directly positioned by plug-in connection, or the tube sheet 2 can be welded to the waste heat boiler or fixedly connected to the waste heat boiler by bolts.

[0030] Specifically, such as Figure 2 As shown, the inner cavity 101 is provided with grooves 102 along the axial direction. There are multiple grooves 102, which are arranged along the axial direction of the shell 1. The heat exchange area is increased by the grooves 102, thereby improving the heat exchange effect.

[0031] Specifically, such as Figure 2 As shown, the fin 3 has a notch 302, which forms a radial structure in the fin 3. The root of the notch 302 is an arc-shaped structure. By setting the notch 302, the accumulation height of soot on the surface of the fin 3 can be reduced. At the same time, the arc-shaped structure can evenly distribute the stress at the root and improve the structural strength.

[0032] Specifically, such as Figure 3 As shown, the swirling structure includes: swirling grooves 303 and swirling protrusions 304. The swirling pit 301 has a swirling protrusion 304 in the middle, and the swirling pit 301 has multiple swirling grooves 303 around its periphery. The swirling grooves 303 extend from the edge of the swirling pit 301 toward the swirling protrusions 304. The swirling grooves are evenly arranged around the outer periphery of the swirling protrusions 304. The swirling grooves 303 guide the gas to flow toward the swirling pit 301, thereby enhancing the vortex effect in the swirling pit 301. At the same time, the swirling protrusions 304 in the middle position can block the airflow from flowing out directly, increasing the residence time of the gas in the swirling pit 301. They can also guide the gas to move along the surface of the swirling protrusions 304, further enhancing the vortex effect and improving the heat exchange effect of the gas.

[0033] Specifically, such as Figure 3 As shown, the swirl groove 303 forms an arc-shaped flow channel in the swirl pit 301. The arc-shaped flow channel structure improves the rotation effect of the airflow, thereby enhancing the vortex effect generated by the gas.

[0034] Specifically, such as Figure 3 As shown, the swirling protrusion 304 is a convex arc-shaped structure, located at the center of the swirling pit 301. The outer arc surface of the arc-shaped protrusion guides the airflow movement, improves the rotation effect of the airflow, and thus enhances the vortex effect generated by the gas.

[0035] Specifically, such as Figure 3 As shown, an annular guide channel 305 is formed between the swirling protrusion 304 and the end of the swirling groove 303. The guide channel 305 is arranged around the swirling protrusion 304. The annular guide channel 305 collects the gas flowing out of the swirling groove 303 and makes the airflow rotate along the guide channel 305, which can enhance the vortex effect generated by the gas. At the same time, when the gas moves to the other side, it will be rotated and thrown out through the swirling groove 303 on the other side, thereby improving the heat exchange effect.

[0036] When this type of heat pipe is in use, the gas flows over the surface of the fins 3. The swirling pits 301 and the swirling structure can increase the surface area of ​​the fins 3 on the one hand, and change the gas flow direction on the other hand, increasing the residence time of the gas on the surface of the fins 3, thereby improving the heat exchange efficiency between the gas and the fins 3.

[0037] Example 2

[0038] The difference between Example 2 and Example 1 lies in the swirl structure, such as... Figure 4 As shown in Embodiment 2, the swirl groove is a spiral groove extending from the edge of the swirl pit towards the center. The spiral groove makes it easier for gas to form a spiral airflow when flowing through the swirl pit, thereby improving the vortex effect.

[0039] The above are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent.

Claims

1. A heat pipe for a waste heat boiler, characterized in that, include: The tube shell has an inner cavity filled with a heat exchange medium; A tube sheet is connected to the outer wall of the middle part of the tube shell, and the tube sheet is used to install the tube shell in the waste heat boiler; Fins are connected to the outer wall of the tube shell. The surface of the fins is provided with a plurality of swirling pits, and swirling structures are provided in the swirling pits.

2. The heat pipe for a waste heat boiler according to claim 1, characterized in that, The inner cavity has grooves arranged along the axial direction.

3. The heat pipe for a waste heat boiler according to claim 1, characterized in that, The fins have notches.

4. The heat pipe for a waste heat boiler according to claim 3, characterized in that, The notch forms a radial structure in the fin.

5. The heat pipe for a waste heat boiler according to claim 1, characterized in that, The swirling structure includes: swirling grooves and swirling protrusions. The swirling pit has a swirling protrusion in the center and a plurality of swirling grooves around the swirling pit. The swirling grooves extend from the edge of the swirling pit toward the swirling protrusions.

6. The heat pipe for a waste heat boiler according to claim 5, characterized in that, The swirl groove forms an arc-shaped flow channel in the swirl pit.

7. The heat pipe for a waste heat boiler according to claim 6, characterized in that, The swirling protrusion has a convex arc-shaped structure.

8. The heat pipe for a waste heat boiler according to claim 7, characterized in that, The swirling protrusion and the end of the swirling groove form an annular guiding channel.

9. The heat pipe for a waste heat boiler according to claim 1, characterized in that, The swirling structure includes a swirling groove, which is a spiral groove extending from the edge of the swirling pit toward the center.

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