Heat exchange device

Abstract

The utility model discloses a heat exchange device which comprises a first flange, a first outer pipe, a condensation pipe bundle, a second flange, a second outer pipe, a heat flow pipe bundle and a communicating pipe. The condensation tube bundle is located in the first outer tube and used for introducing cold fluid, one end of the first outer tube and one end of the condensation tube bundle are connected with one first flange, and the other end of the first outer tube and the other end of the condensation tube bundle are connected with the other first flange; the first flange, the inner wall of the first outer pipe and the outer wall of the condensation pipe bundle form a sealed condensation cavity; the hot flow tube bundle is located in the second outer tube and used for introducing hot fluid, one end of the second outer tube and one end of the hot flow tube bundle are connected with one second flange, and the other end of the second outer tube and the other end of the hot flow tube bundle are connected with the other second flange; the second flange, the inner wall of the second outer pipe and the outer wall of the heat flow pipe bundle form a sealed evaporation cavity; the two ends of the communicating pipe are connected with the first outer pipe and the second outer pipe correspondingly. The heat exchange efficiency and the structural reliability can be improved.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange equipment technology, and in particular to a heat exchange device. Background Technology

[0002] Most heat exchangers on the market currently employ a common double-tube sheet structure, where hot and cold fluids exchange heat directly inside and outside the tubes. This structure results in high flow resistance for the heat exchange medium and low heat exchange efficiency. Furthermore, the significant temperature difference between the hot and cold fluids easily leads to stress concentration on the tube walls, which can cause cracking over time, affecting the lifespan and operational safety of the heat exchanger. Additionally, the unreasonable heat pipe arrangement in existing heat exchangers can cause uneven heat exchange, reducing the overall heat exchange effect. Moreover, the traditional shell structure of heat exchangers often uses a circular cross-section, which can easily lead to localized stress concentration under high-temperature and high-pressure conditions, affecting the structural reliability of the equipment.

[0003] Therefore, there is an urgent need to propose a heat exchange device to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a heat exchange device that can improve heat exchange efficiency and structural reliability.

[0005] To solve the above-mentioned technical problems, this utility model provides a heat exchange device, including a first flange, a first outer tube, a condenser tube bundle, a second flange, a second outer tube, a heat flow tube bundle, and a connecting pipe;

[0006] The condenser tube bundle is located inside the first outer tube and is used to introduce cold fluid. One end of the first outer tube and the condenser tube bundle are both connected to one of the first flanges, and the other end of the first outer tube and the condenser tube bundle are both connected to the other first flange. The first flange, the inner wall of the first outer tube, and the outer wall of the condenser tube bundle form a sealed condensation chamber.

[0007] The heat flow tube bundle is located inside the second outer tube and is used to introduce hot fluid. One end of the second outer tube and the heat flow tube bundle are both connected to one of the second flanges, and the other end of the second outer tube and the heat flow tube bundle are both connected to the other second flange. The second flange, the inner wall of the second outer tube, and the outer wall of the heat flow tube bundle form a sealed evaporation chamber.

[0008] The two ends of the connecting pipe are respectively connected to the first outer pipe and the second outer pipe; the evaporation chamber and the condensation chamber are filled with heat exchange medium. The heat exchange medium absorbs heat and vaporizes in the evaporation chamber and enters the condensation chamber through the connecting pipe. After condensing in the condensation chamber, it flows back to the evaporation chamber through the connecting pipe.

[0009] Furthermore, the cross-sections of both the condensation chamber and the evaporation chamber are elliptical, and the eccentricity of the ellipse ranges from 0.5 to 0.73.

[0010] Furthermore, both the condenser tube bundle and the heat flow tube bundle are configured in multiple rows.

[0011] Furthermore, the projections of adjacent rows of condenser tube bundles in the vertical direction do not overlap.

[0012] Furthermore, the projections of two adjacent rows of heat flow tube bundles overlap in the vertical direction.

[0013] Furthermore, the first outer tube and the first flange, and the second outer tube and the second flange, are both connected by welded sealing or by detachable connection.

[0014] Furthermore, the condenser tube bundle and the first flange, and the hot flow tube bundle and the second flange, are connected by welded sealing or detachable connection.

[0015] Furthermore, the connecting pipe is configured as a plurality of pipes.

[0016] Furthermore, the first outer tube is provided with a plurality of first connecting holes; the second outer tube is provided with a plurality of second connecting holes; and the two ends of the connecting tube are respectively connected to the first connecting holes and the second connecting holes.

[0017] Furthermore, the heat exchange medium includes a medium fluid and one of Fe3O4 nanopowder, Al2O3 nanopowder, or SiC nanopowder.

[0018] Through the above technical solution, this utility model has the following beneficial effects:

[0019] By employing a sealed condensation chamber and evaporation chamber structure and filling them with heat exchange medium, heat transfer is achieved through the phase change process of the heat exchange medium, significantly improving heat exchange efficiency. At the same time, the hot fluid and cold fluid exchange heat with the heat exchange medium separately, avoiding stress concentration problems caused by direct contact and improving the service life and safety of the device.

[0020] In addition, by designing the cross-sections of the condensation chamber and evaporation chamber as elliptical shapes with a specific eccentricity and adopting a reasonable tube bundle arrangement, the stress distribution was effectively improved and the structural reliability was enhanced. The arrangement of multiple connecting pipes ensured smoother circulation of the heat exchange medium, and the use of nanofluids further enhanced the heat transfer performance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the heat exchange device in one embodiment of the present invention;

[0022] Figure 2 This is a side view of the first flange, the first outer pipe, and the condenser tube bundle in a heat exchange device according to an embodiment of the present invention.

[0023] Figure 3 This is a cross-sectional view of the first outer tube and the condenser tube bundle in a heat exchange device according to an embodiment of the present invention.

[0024] Figure 4 This is a side view of the second flange, the second outer pipe, and the heat flow tube bundle in a heat exchange device according to an embodiment of the present invention.

[0025] Figure 5 This is a cross-sectional view of the second outer tube and the heat flow tube bundle in a heat exchange device according to an embodiment of the present invention.

[0026] In the figure, 1 is the first flange; 2 is the first outer pipe; 21 is the first connecting hole; 3 is the condenser tube bundle; 4 is the second flange; 5 is the second outer pipe; 51 is the second connecting hole; 6 is the heat flow tube bundle; and 7 is the connecting pipe. Detailed Implementation

[0027] The heat exchange device of the present invention will now be described in more detail with reference to the accompanying drawings, which illustrate preferred embodiments of the present invention. It should be understood that those skilled in the art can modify the present invention described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the present invention.

[0028] The present invention will be described in more detail below by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0029] like Figure 1 As shown in the figure, this utility model embodiment proposes a convenient and practical heat exchange device, including a first flange 1, a first outer tube 2, a condenser tube bundle 3, a second flange 4, a second outer tube 5, a heat flow tube bundle 6, and a connecting pipe 7.

[0030] Specifically, in combination Figures 1-3 As shown, the condenser tube bundle 3 is located inside the first outer tube 2 and is used to introduce cold fluid. One end of both the first outer tube 2 and the condenser tube bundle 3 is connected to one of the first flanges 1, and the other end of both the first outer tube 2 and the condenser tube bundle 3 is connected to the other first flange 1. The first flange 1, the inner wall of the first outer tube 2, and the outer wall of the condenser tube bundle 3 form a sealed condensation chamber. This structure avoids the risk of direct contact between hot and cold fluids and improves the safety of the heat exchange device.

[0031] In this embodiment, combined with Figure 1 , Figure 4 and Figure 5 As shown, the heat flow tube bundle 6 is located inside the second outer tube 5 and is used to introduce hot fluid. One end of both the second outer tube 5 and the heat flow tube bundle 6 is connected to one of the second flanges 4, and the other end of both are connected to the other second flange 4. The second flange 4, the inner wall of the second outer tube 5, and the outer wall of the heat flow tube bundle 6 form a sealed evaporation chamber. This structure enhances the sealing performance of the heat exchange device, allowing the hot and cold fluids to flow separately within the tubes, significantly reducing the probability of liquid mixing.

[0032] In this embodiment, the two ends of the connecting pipe 7 are respectively connected to the first outer pipe 2 and the second outer pipe 5; the evaporation chamber and the condensation chamber are filled with heat exchange medium. After the heat exchange medium absorbs heat and vaporizes in the evaporation chamber, it enters the condensation chamber through the connecting pipe 7. After condensing in the condensation chamber, it flows back to the evaporation chamber through the connecting pipe 7.

[0033] In a specific example, the flow rates of the hot and cold fluids are adjustable. When the tube-side heat transfer coefficient is 3600 W·m⁻²·K⁻¹·h⁻¹, the overall heat transfer coefficient of this heat exchange device can reach 1800 W·m⁻²·K⁻¹·h⁻¹, significantly higher than the 654 W·m⁻²·K⁻¹·h⁻¹ of traditional shell-and-tube heat exchangers. Those skilled in the art will understand that the charge amount of the heat exchange medium can be set according to actual needs.

[0034] In a preferred embodiment, both the condensation chamber and the evaporation chamber have elliptical cross-sections, with the eccentricity of the ellipse ranging from 0.5 to 0.73. This elliptical structure not only improves the structural strength of the heat exchanger under high temperature and high pressure conditions but also adapts to fluid flow characteristics, reducing flow resistance.

[0035] In this embodiment, both the condenser tube bundle 3 and the heat transfer tube bundle 6 are arranged in multiple rows. Specifically, the vertical projections of adjacent rows of condenser tube bundles 3 do not overlap, and the vertical projections of adjacent rows of heat transfer tube bundles 6 may or may not overlap, such as... Figure 4 The diagram shows the vertical projections of two adjacent rows of heat exchange tube bundles 6 without overlap. Preferably, the condenser tube bundle 3 and the heat exchange tube bundle 6 are arranged in an arc shape and are a single layer, with multiple heat exchange units connected in parallel or series. Those skilled in the art will know that the length of the heat exchange unit can be selected through simulation to find a more economical value. This arrangement not only increases the heat exchange area and improves heat exchange efficiency but also avoids mutual interference between the heat exchange tube bundle 6 and the condenser tube bundle 3 during evaporation and condensation.

[0036] In one embodiment, the first outer pipe 2 and the first flange 1, and the second outer pipe 5 and the second flange 4, can be connected by welding or by a detachable connection. In a specific example, the detachable connection can be a flange bolt connection, which facilitates later maintenance and repair, and improves the maintenance efficiency of the device.

[0037] Preferably, the condenser tube bundle 3 and the first flange 1, and the hot flow tube bundle 6 and the second flange 4, can be connected by welded sealing or by detachable connection. In a specific example, the welded sealing connection can be achieved by argon arc welding, which improves the connection strength and sealing performance.

[0038] In this embodiment, multiple connecting pipes 7 are provided. Specifically, the first outer pipe 2 is provided with multiple first connecting holes 21; the second outer pipe 5 is provided with multiple second connecting holes 51; and both ends of the connecting pipe 7 are connected to the first connecting holes 21 and the second connecting holes 51, respectively. The arrangement of multiple connecting pipes 7 can not only improve the circulation efficiency of the heat exchange medium, but also enhance the reliability of the system.

[0039] In one embodiment, the heat exchange medium includes a medium fluid and one of Fe3O4 nanoparticles, Al2O3 nanoparticles, or SiC nanoparticles. Specifically, the medium fluid is water, ammonia, alcohol, or acetone; those skilled in the art will understand that the selection of the medium fluid can be set according to actual needs, and other embodiments besides this one are also included. Preferably, adding nanoparticles to the medium fluid can inhibit bubble formation and slow down heat exchange deterioration. Since the molecular density of Fe3O4 nanoparticles, Al2O3 nanoparticles, and SiC nanoparticles is greater than the density of the medium fluid, it can increase the reflux rate of the medium fluid, thereby improving the heat exchange efficiency. Those skilled in the art will understand that the proportion of nanoparticles added can be set according to actual needs, and other embodiments besides this one are also included.

[0040] In this embodiment, the device can be installed in conjunction with a designated device and connected to the designated device via a pump set. Specifically, the pump set can be used to transport the hot and cold fluids from the designated device to the condenser tube bundle 3 and the hot flow tube bundle 6 of this heat exchange device for heat exchange operations.

[0041] Specifically, the heat exchanger operates as follows: The hot fluid flows through the heat exchange tube bundle 6 at a certain velocity, transferring heat Q1 to the low-boiling-point heat exchange medium in the evaporation chamber via the wall of the heat exchange tube bundle 6, causing the heat exchange medium to absorb heat and vaporize. The gaseous heat exchange medium, in a two-phase state (vapor and liquid), enters the condensation chamber through the connecting pipe 7, releasing heat Q2 on the outer wall of the condensation tube bundle 3. Q2 transfers heat to the cold fluid through the tube wall. The condensed liquid heat exchange medium, under gravity, flows back to the evaporation chamber through the connecting pipe 7, completing one heat exchange cycle. When the system reaches an adiabatic steady state, the evaporation and condensation rates of the heat exchange medium are equal, i.e., Q1 = Q2.

[0042] In a specific example, the flow rates of the hot and cold fluids can be controlled by adjusting the pump's operating parameters, thereby achieving precise regulation of heat exchange efficiency. When the overall heat exchange reaches a steady state, the system is in a dynamic equilibrium. This operating mode not only improves heat exchange efficiency but also enhances the overall operational stability.

[0043] In summary, the heat exchange device proposed in this utility model has the following advantages:

[0044] By employing a sealed condensation chamber and evaporation chamber structure and filling them with heat exchange medium, heat transfer is achieved through the phase change process of the heat exchange medium, significantly improving heat exchange efficiency. At the same time, the hot fluid and cold fluid exchange heat with the heat exchange medium separately, avoiding stress concentration problems caused by direct contact and improving the service life and safety of the device.

[0045] In addition, by designing the cross-sections of the condensation chamber and evaporation chamber as elliptical shapes with a specific eccentricity and adopting a reasonable tube bundle arrangement, the stress distribution was effectively improved and the structural reliability was enhanced. The arrangement of multiple connecting pipes ensured smoother circulation of the heat exchange medium, and the use of nanofluids further enhanced the heat transfer performance.

[0046] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A heat exchange device, characterized by, It includes a first flange, a first outer pipe, a condenser tube bundle, a second flange, a second outer pipe, a hot flow tube bundle, and a connecting pipe; The condenser tube bundle is located inside the first outer tube and is used to introduce cold fluid. One end of the first outer tube and the condenser tube bundle are both connected to one of the first flanges, and the other end of the first outer tube and the condenser tube bundle are both connected to the other first flange. The first flange, the inner wall of the first outer tube, and the outer wall of the condenser tube bundle form a sealed condensation chamber. The heat flow tube bundle is located inside the second outer tube and is used to introduce hot fluid. One end of the second outer tube and the heat flow tube bundle are both connected to one of the second flanges, and the other end of the second outer tube and the heat flow tube bundle are both connected to the other second flange. The second flange, the inner wall of the second outer tube, and the outer wall of the heat flow tube bundle form a sealed evaporation chamber. The two ends of the connecting pipe are respectively connected to the first outer pipe and the second outer pipe; the evaporation chamber and the condensation chamber are filled with heat exchange medium. The heat exchange medium absorbs heat and vaporizes in the evaporation chamber and enters the condensation chamber through the connecting pipe. After condensing in the condensation chamber, it flows back to the evaporation chamber through the connecting pipe.

2. The heat exchange device according to claim 1, wherein The cross-sections of both the condensation chamber and the evaporation chamber are elliptical, and the eccentricity of the ellipse ranges from 0.5 to 0.

73.

3. The heat exchange device of claim 1, wherein Both the condenser tube bundle and the heat flow tube bundle are configured in multiple rows.

4. The heat exchange device according to claim 3, wherein The projections of adjacent rows of condenser tube bundles in the vertical direction do not overlap.

5. The heat exchange device of claim 3, wherein The projections of two adjacent rows of heat flow tube bundles overlap in the vertical direction.

6. The heat exchange device of claim 1, wherein The first outer tube and the first flange, and the second outer tube and the second flange are both connected by welded sealing or by detachable connection.

7. The heat exchange device as described in claim 1, characterized in that, The condenser tube bundle and the first flange, and the hot flow tube bundle and the second flange, are connected by welded sealing or detachable connection.

8. The heat exchange device as described in claim 1, characterized in that, The connecting pipes are configured as multiple.

9. The heat exchange device as described in claim 8, characterized in that, The first outer tube is provided with a plurality of first connecting holes; the second outer tube is provided with a plurality of second connecting holes; the two ends of the connecting tube are respectively connected to the first connecting holes and the second connecting holes.

10. The heat exchange device as described in claim 1, characterized in that, The heat exchange medium includes a medium fluid and one of Fe3O4 nanopowder, Al2O3 nanopowder, or SiC nanopowder.

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