Lean and rich liquid double-channel heat exchanger

Abstract

The utility model belongs to the technical field of heat exchangers, and particularly relates to a lean and rich liquid double-flow-channel heat exchanger which comprises a shell, a shell cavity is formed in the shell, and first liquid flows in the shell cavity. At least one baffle plate group is arranged in the shell cavity, the baffle plate group comprises a plurality of baffle plates, the baffle plates and the inner wall of the shell cavity are obliquely arranged, and through holes are formed in the surfaces of the baffle plates; the guide pipe is arranged in the shell cavity and penetrates through the through hole, so that the spiral cavity is formed in the guide pipe, the second liquid spirally flows in the spiral cavity, the flowing path of the second liquid in the guide pipe is increased, the heat exchange area of the second liquid in the guide pipe is increased, and therefore the heat exchange performance of the pipe side is improved. Meanwhile, the second liquid flowing spirally can generate certain centrifugal force, so that heat exchange between the second liquid and the inner wall of the guide pipe is more sufficient, and the heat exchange efficiency is further improved.

Description

Technical Field

[0001] This utility model belongs to the field of heat exchanger technology, specifically relating to a dual-channel heat exchanger with lean and rich liquids. Background Technology

[0002] A shell-and-tube heat exchanger transfers heat by exchanging heat between a first liquid inside the shell and a second liquid inside a conduit. The first liquid inside the shell and the second liquid inside the conduit have different temperatures. As they flow within the shell and conduit, heat is transferred from the warmer fluid to the cooler fluid due to the temperature difference, thus achieving heat exchange.

[0003] Currently, the most commonly used traditional shell-and-tube heat exchanger is the arc-shaped baffle. However, due to its defects such as large mainstream and pressure drop, flow stagnation zone, easy fouling, and easy failure under vibration conditions, it has been gradually replaced by the spiral baffle in recent years. Compared with the traditional arc-shaped baffle heat exchanger, the spiral baffle heat exchanger has lower shell-side resistance, higher heat transfer coefficient, and the medium is less prone to fouling in the shell side, allowing for high-efficiency and long-term operation.

[0004] However, although existing spiral baffle heat exchangers enhance shell-side heat exchange efficiency by utilizing spiral baffles, their tube-side uses only simple smooth circular tubes that are straight. This results in relatively weak heat exchange performance on the tube side, thus reducing the overall heat exchange efficiency. Utility Model Content

[0005] In view of this, the present invention provides a dual-channel heat exchanger with lean and rich liquids, the purpose of which is to improve the heat exchange performance on the tube side, thereby improving the overall heat exchange efficiency.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A dual-channel heat exchanger for lean and rich liquids includes a shell, and a shell cavity is formed inside the shell, which is suitable for flowing a first liquid.

[0008] A baffle assembly, at least one of the baffle assemblies is disposed within the shell cavity, the baffle assembly includes multiple baffles, the baffles are inclined between the baffles and the inner wall of the shell cavity, and the surface of the baffles is provided with through holes;

[0009] A conduit is disposed within the shell cavity and passes through the through hole, and the conduit has a spiral cavity that is adapted to flow a second liquid, the second liquid having a different temperature from the first liquid.

[0010] As a preferred technical solution, the surface of the conduit is provided with a spiral protrusion, and a gap is left between the spiral protrusion and the through hole, and the gap is suitable for the flow of the first liquid.

[0011] Furthermore, each of the aforementioned baffle groups comprises four baffles, which form a circular cycle that is spiral-shaped.

[0012] Furthermore, adjacent baffles within the same baffle group overlap each other, and baffles between adjacent baffle groups overlap each other.

[0013] Furthermore, it also includes an overlap portion, which is disposed at the edge of the baffle plate. The overlap portion includes a first overlap plate and a second overlap plate, wherein the first overlap plate and the second overlap plate are respectively disposed on both sides of the baffle plate, and the height of the first overlap plate is higher than that of the second overlap plate.

[0014] Furthermore, the baffle plate has a fan-shaped planar structure, with the first overlapping plate and the second overlapping plate respectively disposed on the two right-angled sides of the baffle plate.

[0015] Furthermore, both the first and second overlapping plates are set at an inclined angle.

[0016] Furthermore, the housing is provided with an input pipe and an output pipe, and both the input pipe and the output pipe are connected to the housing cavity.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0018] By incorporating a helical cavity within the conduit, the second liquid flows in a helical pattern, increasing its flow path and heat exchange area, thereby improving the heat exchange performance on the conduit side. Simultaneously, the helical flow of the second liquid generates centrifugal force, resulting in more thorough heat exchange between the second liquid and the inner wall of the conduit, further enhancing heat exchange efficiency.

[0019] In addition, the overlapping parts between the baffle assemblies not only enhance the turbulence on the shell side and improve the heat transfer efficiency on the shell side, but also effectively prevent short-circuiting and dead zones of the first liquid in the shell cavity, making the flow of the first liquid in the shell cavity more uniform and further improving the overall heat transfer performance. Attached Figure Description

[0020] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0021] Figure 1 This is a schematic diagram of the structure of the dual-channel heat exchanger for lean and rich liquids provided by this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the baffle plate provided by this utility model;

[0023] Figure 3This is a schematic diagram of the overlapping structure of the baffles provided by this utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the catheter provided by this utility model.

[0025] Shell-1; conduit-2; baffle-3; overlap-4; through hole-5; first overlap plate-6; second overlap plate-7; spiral cavity-8; input pipe-9; output pipe-10; shell cavity-11. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example 1

[0028] In existing technologies, spiral baffle heat exchangers have reduced shell-side resistance, higher heat transfer coefficients, and are less prone to fouling and scaling in the shell side, allowing for high-efficiency, long-term operation. However, although spiral baffle heat exchangers enhance shell-side heat transfer efficiency by utilizing spiral baffles, their tube side uses only simple, smooth, straight circular tubes. This results in relatively weak heat transfer performance on the tube side, thus reducing the overall heat transfer efficiency.

[0029] Therefore, in order to solve the above problems and improve the heat exchange performance on the tube side and enhance the overall heat exchange efficiency, this utility model discloses a lean and rich liquid dual-channel heat exchanger. (See reference...) Figure 1 and Figure 4 The system includes a housing 1, with a cavity 11 inside the housing 1, which is suitable for the flow of a first liquid; a baffle assembly, at least one of which is disposed in the cavity 11, the baffle assembly including multiple baffles 3, the baffles 3 being inclinedly disposed between themselves and the inner wall of the cavity 11, and the surface of the baffles 3 being provided with through holes 5; and a conduit 2, which is disposed in the cavity 11 and passes through the through holes 5, and the conduit 2 being provided with a spiral cavity 8, the spiral cavity 8 being suitable for the flow of a second liquid, the second liquid being at a different temperature than the first liquid.

[0030] In this embodiment, the conduit 2 has a spiral cavity 8 inside, allowing the second liquid to flow spirally within the conduit 2 along the spiral cavity 8. This increases the flow path and heat exchange area of ​​the second liquid within the conduit 2, thereby improving the heat exchange performance on the tube side. Simultaneously, because the baffle 3 is inclined relative to the inner wall of the shell cavity 11, the first liquid can flow spirally within the shell cavity 11. This double-spiral flow channel configuration further enhances the heat exchange efficiency between the shell side and the tube side.

[0031] Furthermore, the surface of the conduit 2 is provided with a spiral protrusion, and a gap is left between the spiral protrusion and the through hole 5. The gap is suitable for the flow of the first liquid. This arrangement allows the first liquid to form a spiral flow when passing through the gap, thereby enabling further heat exchange with the second liquid in the conduit 2 and improving the heat transfer efficiency.

[0032] It should be noted that the conduit 2 is placed horizontally inside the shell cavity 11, and both ends of the conduit 2 pass through the inner wall of the shell cavity 11 and are fixed, thereby allowing a gap to be left between the spiral protrusion of the conduit 2 and the through hole 5.

[0033] It is understandable that there are multiple through holes 5, and the number of conduits 2 is less than or equal to the number of through holes 5.

[0034] In one embodiment, the lean and rich liquid dual-channel heat exchanger employs discontinuous spiral baffles. Specifically, it uses a series of fan-shaped flat plates (referred to as spiral baffles) instead of alternating curved surfaces to form an approximate spiral surface on the shell side, causing the shell-side fluid to produce an approximate continuous spiral flow.

[0035] For example, any one of the baffle groups has four baffles 3, which form a circular cycle. This circular cycle is spiral-shaped. Adjacent baffles 3 within the same baffle group overlap each other, and baffles 3 between adjacent baffle groups overlap each other. This arrangement allows the first liquid inside the shell 1 to continuously change its flow direction during flow, forming a spiral flow path, further enhancing the heat exchange effect on the shell side. In addition, since the baffle group adopts a discontinuous spiral baffle design, it is easier to process and install than traditional continuous spiral baffles, reducing manufacturing costs.

[0036] Example 2

[0037] Based on Embodiment 1, when two adjacent baffles 3 overlap, in order to improve the overlap stability and flow guiding efficiency between the baffles 3, refer to... Figure 2 and Figure 3It also includes an overlap portion 4, which is disposed on the edge of the baffle plate 3. The overlap portion 4 includes a first overlap plate 6 and a second overlap plate 7, wherein the first overlap plate 6 and the second overlap plate 7 are respectively disposed on both sides of the baffle plate 3, and the height of the first overlap plate 6 is higher than that of the second overlap plate 7.

[0038] The overlapping part 4 helps to make the adjacent baffles 3 more compact, and at the same time improves the continuity between adjacent baffles 3, so as to reduce the local short circuit of the first liquid during flow.

[0039] Specifically, when connecting the baffles 3, the user can stack the first overlapping plate 6 and the second overlapping plate 7 on two adjacent baffles 3 respectively, so that the first overlapping plate 6 covers the second overlapping plate 7, forming a stepped overlapping structure. This stepped overlapping design not only enhances the mechanical connection strength between adjacent baffles 3, but also guides the fluid on the shell side to flow continuously along the spiral trajectory on the surface of the baffles through the height difference, effectively suppressing fluid leakage and stagnation at the overlapping gap.

[0040] Optionally, both the first overlapping plate 6 and the second overlapping plate 7 are inclined at complementary angles. This geometric optimization helps improve the stacking stability of adjacent baffles 3. Specifically, the inclination direction of the first overlapping plate 6 is opposite to that of the second overlapping plate 7, forming a mutually supporting structure. When the overlapping portions 4 of adjacent baffles 3 are stacked, it can prevent the overlapping plates from misaligning or separating under fluid scouring.

[0041] Furthermore, the baffle plate 3 has a fan-shaped planar structure, and the first overlapping plate 6 and the second overlapping plate 7 are respectively disposed on the two right-angled sides of the baffle plate 3.

[0042] Example 3

[0043] Based on Embodiments 1 and 2, the housing 1 is provided with an input pipe 9 and an output pipe 10, both of which are connected to the housing cavity 11. The input pipe 9 and output pipe 10 are used to introduce and extract the first liquid. In use, the first liquid enters the housing cavity 11 through the input pipe 9. Inside the housing cavity 11, the first liquid flows in a spiral pattern under the guidance of the baffle plate 3. This flow pattern not only increases the flow path of the first liquid within the housing cavity 11 but also improves the heat exchange efficiency between the first liquid and the inner wall of the housing cavity 11 and the outer surface of the conduit 2. Simultaneously, the second liquid in the conduit 2 also flows in a spiral pattern under the guidance of the spiral cavity 8, further increasing the heat exchange area between the second liquid and the inner wall of the conduit 2. When the first and second liquids flow within the housing cavity 11 and the conduit 2, due to the temperature difference, heat is transferred from the higher-temperature fluid to the lower-temperature fluid, thus achieving efficient heat transfer. Finally, the first liquid, after heat exchange, is discharged from the housing cavity 11 through the output pipe 10, completing the entire heat exchange process.

[0044] In summary, based on Examples 1 to 3, the operating steps of this lean and rich liquid dual-channel heat exchanger are as follows:

[0045] First, check the assembly status of each component of the heat exchanger. Confirm that the gap between the spiral protrusion of the duct 2 and the through hole 5 of the baffle 3 is uniform, the bolts of the overlapping part 4 of the baffle assembly are tight and not loose, and the connection between the inlet pipe 9 and the outlet pipe 10 and the shell cavity 11 is well sealed.

[0046] Secondly, ensure that the first overlapping plate 6 and the second overlapping plate 7 of the adjacent baffles 3 form a stepped stack to guide the shell-side fluid to flow along a spiral trajectory.

[0047] Subsequently, a first liquid is introduced, which is introduced into the shell cavity 11 through the inlet pipe 9. Within the shell cavity 11, due to the spiral arrangement of the baffle 3, the first liquid is guided into a spiral flow. This flow pattern not only prolongs the flow path of the first liquid within the shell cavity 11 but also effectively improves the heat exchange efficiency between the first liquid and the inner wall of the shell cavity 11, as well as the outer surface of the conduit 2.

[0048] Meanwhile, the second liquid inside conduit 2 also flows in a spiral pattern within conduit 2, guided by the spiral cavity 8. This flow pattern increases the heat exchange area between the second liquid and the inner wall of conduit 2, thereby further improving the heat exchange efficiency.

[0049] As the first and second liquids continue to flow within the shell cavity 11 and the conduit 2, heat will spontaneously transfer from the hotter fluid to the cooler fluid due to the temperature difference between them. This heat exchange process continues until the first and second liquids reach new thermal equilibrium states.

[0050] Finally, during shutdown maintenance, first close the input and output valves and drain the liquid from the shell cavity 11. Disassemble the baffle assembly to inspect the wear of the overlapping part 4, and clean the detachable discontinuous spiral baffles. If corrosion is found in the spiral cavity 8 of the conduit 2, replace the damaged conduit separately without affecting the overall structure.

[0051] With the aforementioned structural design, this dual-channel heat exchanger for both rich and lean liquids improves heat exchange efficiency and ensures long-term stable operation of the equipment.

[0052] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0053] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dual-channel heat exchanger for lean and rich liquids, characterized in that, include: The housing (1) has a cavity (11) inside, which is suitable for the flow of a first liquid; A baffle assembly, at least one of the baffle assemblies is disposed in the shell cavity (11), the baffle assembly includes a plurality of baffles (3), the baffles (3) are inclined between the baffles (3) and the inner wall of the shell cavity (11), and the surface of the baffles (3) is provided with through holes (5); The conduit (2) is located inside the shell cavity (11) and passes through the through hole (5). The conduit (2) is provided with a spiral cavity (8) which is suitable for flowing a second liquid, the second liquid having a different temperature from the first liquid.

2. The lean and rich liquid dual-channel heat exchanger according to claim 1, characterized in that, The surface of the conduit (2) is provided with a spiral protrusion, and there is a gap between the spiral protrusion and the through hole (5), and the gap is suitable for the flow of the first liquid.

3. The lean and rich liquid dual-channel heat exchanger according to claim 2, characterized in that, The number of baffles (3) in any of the baffle groups is four, and the four baffles (3) form a circular cycle, which is spiral.

4. The lean and rich liquid dual-channel heat exchanger according to claim 3, characterized in that, Adjacent baffles (3) within the same baffle group overlap each other, and baffles (3) between adjacent baffle groups overlap each other.

5. The lean and rich liquid dual-channel heat exchanger according to claim 4, characterized in that, It also includes an overlap portion (4), which is located on the edge of the baffle plate (3). The overlap portion (4) includes a first overlap plate (6) and a second overlap plate (7). The first overlap plate (6) and the second overlap plate (7) are respectively located on both sides of the baffle plate (3), and the height of the first overlap plate (6) is higher than that of the second overlap plate (7).

6. The lean and rich liquid dual-channel heat exchanger according to claim 5, characterized in that, The baffle plate (3) has a fan-shaped planar structure, and the first overlapping plate (6) and the second overlapping plate (7) are respectively located on the two right-angled sides of the baffle plate (3).

7. The lean and rich liquid dual-channel heat exchanger according to claim 6, characterized in that, Both the first overlapping plate (6) and the second overlapping plate (7) are set at an inclined angle.

8. The lean and rich liquid dual-channel heat exchanger according to claim 1, characterized in that, The housing (1) is provided with an input pipe (9) and an output pipe (10), and both the input pipe (9) and the output pipe (10) are connected to the cavity (11).

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