A high-efficiency heat transfer double-coil rising pipe heat exchanger structure

Abstract

The utility model discloses a kind of high-efficiency heat transfer's double-coil riser heat exchanger structure, including by inside sequentially arranged riser, inner cylinder, heat exchange coil and outer cylinder, the inner wall of riser is provided with heat-conducting reticulated structure, the inner wall of riser is provided with heat-conducting coating in heat-conducting reticulated structure inside. Heat-conducting reticulated structure can increase the contact area of riser inner wall and raw coal gas, heat-conducting reticulated structure is combined with heat-conducting coating, it is favorable to make the heat of raw coal gas more pass through heat-conducting coating and heat-conducting reticulated structure and be transferred to riser, it is favorable to promote the heat transfer efficiency of raw coal gas to riser.

Description

Technical Field

[0001] This application relates to the technical field of exhaust devices for dry distillation gas, and specifically to a high-efficiency heat transfer dual-coil riser heat exchanger structure. Background Technology

[0002] In industrial heat exchange equipment in the metallurgical and coking fields, the riser heat exchanger is a core component for the utilization of waste heat from raw coal gas. Its heat transfer efficiency and structural strength directly affect the overall performance and service life of the waste heat recovery system. Currently, traditional riser heat exchangers often employ finned or smooth inner wall designs for their inner cylinders. With finned risers, tar gradually accumulates on the inner wall over time, making thorough cleaning difficult and ultimately leading to a gradual decrease in heat transfer efficiency, affecting the system's steam production rate. While smooth inner wall designs do not have the problem of difficult tar removal, a small amount of graphite carbon flakes inevitably adhere to the smooth inner cylinder. When the riser is opened for furnace cooling, these graphite carbon flakes may float out. Given their high temperature, these graphite flakes pose a risk of scalding workers at the furnace top. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a high-efficiency heat transfer dual-coil riser heat exchanger structure, and the technical solution adopted includes: A high-efficiency heat transfer dual-coil riser heat exchanger structure includes a riser, an inner cylinder, a heat exchange coil, and an outer cylinder arranged sequentially from the inside to the outside. The inner wall of the riser is provided with a heat-conducting mesh structure, and the inner wall of the riser is provided with a heat-conducting coating on the inner side of the heat-conducting mesh structure.

[0004] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the heat-conducting mesh structure is a honeycomb tortoise shell mesh.

[0005] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the material of the heat-conducting mesh structure is heat-resistant steel, and it is welded and fixedly installed on the inner wall of the riser pipe.

[0006] The technical solution adopted by one embodiment of this utility model to solve its technical problem is as follows: the riser pipe includes a bottom pipe section and an upper pipe section located above the bottom pipe section. The bottom pipe section is provided with a heat insulation coating on the inner side of the heat-conducting mesh structure, and the upper pipe section is provided with a heat-conducting coating on the inner side of the heat-conducting mesh structure.

[0007] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the heat exchange coil includes at least two coils.

[0008] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: flanges are respectively provided at the upper and lower ends of the riser pipe. The bottom of the outer cylinder is provided with load-bearing lugs spaced circumferentially thereon. These load-bearing lugs are fixedly connected to the flange. The flange is fixedly connected to the inner cylinder.

[0009] The technical solution adopted by one embodiment of this utility model to solve its technical problem is as follows: The load-bearing lugs or inner cylinder are welded to the flange.

[0010] The technical solution adopted by one embodiment of this utility model to solve its technical problem is as follows: The load-bearing lugs or inner cylinder are connected to the flange by insert fillet weld or T-joint welding.

[0011] The technical solution adopted by one embodiment of this utility model to solve its technical problem is as follows: The weld height for insert fillet welds is 8-12mm, and the weld height for T-joint welds is 10-15mm.

[0012] The technical solution adopted by one embodiment of this utility model to solve its technical problem is as follows: A header is provided at the outlet or inlet of the riser pipe, and the heat exchange coil is butt-welded to the header.

[0013] The beneficial effects of this utility model are: the thermally conductive mesh structure can improve the adhesion of the thermally conductive coating, ensure that the thermally conductive coating is stably attached to the inner wall of the riser pipe, and ensure the stability of heat transfer performance; On the other hand, the heat-conducting mesh structure can increase the contact area between the inner wall of the riser pipe and the raw coal gas. The combination of the heat-conducting mesh structure and the heat-conducting coating is conducive to transferring more heat from the raw coal gas to the riser pipe through the heat-conducting coating and the heat-conducting mesh structure, which is beneficial to improving the heat transfer efficiency of the raw coal gas to the riser pipe and overcoming the limitation of the heat transfer area of ​​the smooth inner wall on the heat transfer efficiency. Compared with the traditional fin structure, the heat-conducting coating forms a smooth surface, reducing the adhesion between tar and the inner wall and avoiding the heat transfer efficiency decay caused by tar accumulation. Compared with the smooth inner wall, the surface adhesion of the heat-conducting coating is low, reducing the amount of graphite carbon sheet adhesion. Even if there is a small amount of adhesion, it is easy to fall off under the impact of the raw coal gas flow due to the low adhesion of the coating, reducing the risk of graphite carbon sheets flying out when the furnace is opened for ventilation and ensuring the safety of the furnace top workers. Attached Figure Description

[0014] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a structural schematic diagram of a riser heat exchanger. Figure 2 This is a schematic diagram of the load-bearing structure of the outer cylinder; Figure 3This is a schematic diagram of the load-bearing structure of the inner cylinder. Figure 4 for Figure 3 Schematic diagram of the structure at point A Figure 1 ; Figure 5 for Figure 3 Schematic diagram of the structure at point A Figure 2 . Detailed Implementation

[0015] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0016] In the description of this utility model, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0017] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] In this utility model, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0019] Reference Figures 1 to 5 The present application proposes an embodiment of the high-efficiency heat transfer dual-coil riser heat exchanger structure, which includes a riser 4, an inner cylinder 1, a heat exchange coil 3 and an outer cylinder 2 arranged sequentially from the inside to the outside. The inner wall of the riser 4 is provided with a heat-conducting mesh structure 5, and the inner wall of the riser 4 is provided with a heat-conducting coating 6 on the inner side of the heat-conducting mesh structure 5.

[0020] On the one hand, the thermally conductive mesh structure 5 can improve the adhesion of the thermally conductive coating 6, ensure that the thermally conductive coating 6 is stably attached to the inner wall of the riser pipe 4, and ensure the stability of heat transfer performance. On the other hand, the heat-conducting mesh structure 5 can increase the contact area between the inner wall of the riser pipe 4 and the raw coal gas. The combination of the heat-conducting mesh structure 5 and the heat-conducting coating 6 is conducive to transferring more heat from the raw coal gas to the riser pipe 4 through the heat-conducting coating 6 and the heat-conducting mesh structure 5, which is beneficial to improving the heat transfer efficiency of the raw coal gas to the riser pipe 4 and overcoming the limitation of the heat exchange area of ​​the smooth inner wall on the heat exchange efficiency. Compared with the traditional fin structure, the heat-conducting coating 6 forms a smooth surface, reducing the adhesion between tar and the inner wall and avoiding the heat transfer efficiency decay caused by tar accumulation. Compared with the smooth inner wall, the surface adhesion of the heat-conducting coating 6 is low, reducing the amount of graphite carbon sheet adhesion. Even if there is a small amount of adhesion, it is easy to fall off under the impact of raw coal gas flow due to the low adhesion of the coating, reducing the risk of graphite carbon sheets flying out when the furnace is opened for ventilation and ensuring the safety of the furnace top workers.

[0021] Preferably, the heat-conducting mesh structure 5 is a honeycomb-shaped tortoise shell mesh.

[0022] The hexagonal honeycomb units of the honeycomb tortoise shell mesh have uniform stress distribution and space filling. Compared with the square mesh structure, the hexagonal honeycomb units can achieve seamless splicing within a unit area, so that there is no waste of pores in the mesh structure of the heat-conducting mesh structure 5. Under the same mesh unit area and the same arrangement density, the perimeter of the hexagonal honeycomb unit is larger, which gives the heat-conducting mesh structure and the raw coal gas a larger effective contact area, which is conducive to improving heat transfer efficiency. The hexagonal wire mesh is usually made of high-strength metal. After being welded to the inner wall of the riser pipe 4, it can maintain structural stability. The hexagonal structure design has stronger impact resistance and deformation resistance.

[0023] In this embodiment, the heat-conducting mesh structure 5 is made of heat-resistant steel and is welded and fixedly installed on the inner wall of the riser pipe 4.

[0024] In the metallurgical coking industry, the temperature of raw coal gas is usually 800-1000℃. Heat-resistant steels such as 310S and 2520 have excellent high-temperature strength and oxidation resistance. They can be used for a long time in high-temperature environments without oxidation corrosion or strength reduction, avoiding the problems of ordinary steel being prone to rust and deformation at high temperatures. Welding enables the mesh heat-conducting structure to form an integrated structure with the inner wall of the riser pipe 4. Compared with bolt connection and adhesive bonding, it avoids the risk of loosening of connecting parts or failure of adhesive at high temperatures, ensuring the long-term stability of the mesh structure.

[0025] In this embodiment, the riser pipe 4 includes a bottom pipe section and an upper pipe section located above the bottom pipe section. The bottom pipe section is provided with a heat insulation coating 8 inside the heat-conducting mesh structure 5, and the upper pipe section is provided with a heat-conducting coating 6 inside the heat-conducting mesh structure 5.

[0026] During the metallurgical coking process, after the raw coal gas escapes from the coke oven, its temperature is distributed in a gradient along the height of the riser pipe 4. The temperature of the raw coal gas in contact with the bottom pipe section is usually higher, close to the coke oven outlet temperature, while the temperature of the upper pipe section gradually decreases. The heat insulation coating 8 of the bottom pipe section can reduce the excessive heating of the riser pipe 4 body by the high-temperature raw coal gas, and prevent the bottom of the riser pipe 4 from experiencing a decrease in strength or deformation due to long-term exposure to extremely high temperatures, thus extending the service life of the riser pipe 4. The heat-conducting coating 6 of the upper pipe section further enhances heat transfer in the area where the raw coal gas temperature is slightly lower, ensuring that the overall heat exchange efficiency is not reduced.

[0027] The thermally conductive coating 6 is made of non-metallic nano-refractory superconducting materials, which can significantly improve the heat transfer efficiency and has good high temperature resistance and corrosion resistance.

[0028] The heat insulation coating 8 uses non-metallic high-temperature resistant heat insulation materials, which can effectively block the transmission of high temperature at the bottom of the inner cylinder 1, protect the bottom structure of the inner cylinder 1, and avoid high-temperature damage.

[0029] Preferably, the heat exchange coil 3 comprises at least two coils.

[0030] Multiple coils can be connected in series. In this case, the heat exchange medium flows through multiple coils in sequence, which can prolong the residence time of the medium in the coils, ensure that the medium fully absorbs heat, and increase the outlet temperature of the heat exchange medium.

[0031] In this embodiment, multiple coils are arranged in parallel. At this time, the heat exchange medium enters multiple coils at the same time. Multiple coils can disperse the flow rate of the heat exchange medium, reduce the flow velocity of the medium in a single coil, and reduce flow resistance. At the same time, with the total stroke unchanged, the heat exchange stroke of the cooling water in a single coil is shortened, the temperature difference between the cooling water in the coil and the inner cylinder is greater, and the heat exchange efficiency is higher.

[0032] The coil is made of heat-resistant alloy steel and is available in various sizes such as Ф38mm, Ф45mm, or Ф57mm. The heat-resistant alloy steel has excellent high-temperature resistance and corrosion resistance, which can adapt to high-temperature heat exchange conditions and extend the service life of the double coil.

[0033] In this embodiment, flanges 10 are respectively provided at the upper and lower ends of the riser pipe 4. The bottom of the outer cylinder 2 is provided with load-bearing lugs 9 spaced circumferentially thereon. The load-bearing lugs 9 are connected and fixed to the flange 10, or The flange 10 is connected and fixed to the inner cylinder 1.

[0034] See attached document Figure 2 The diagram shows the connection structure between the load-bearing lug 9 and the flange 10. At this time, the load-bearing lug 9 acts as a support structure to support the outer cylinder. By connecting with the riser pipe 4 flange 10, the weight of the outer cylinder 2, the inner cylinder 1, and the heat exchange coil 3 is transferred to the riser pipe 4, and then transferred to the equipment foundation by the riser pipe 4.

[0035] See attached document Figure 3 The diagram shows the connection structure between the inner cylinder 1 and the flange 10. The inner cylinder 1 is directly connected to the flanges at both ends of the riser pipe 4 to form a rigid connection, which enables the inner cylinder to bear the load and further enhances the stability of the overall structure.

[0036] Preferably, the load-bearing lug 9 or the inner cylinder 1 is welded to the flange 10. Specifically, the load-bearing lug 9 or the inner cylinder 1 is connected to the flange 10 by insert fillet weld or T-joint welding.

[0037] For insert-type fillet weld connections, insert the end of the load-bearing lug 9 or the inner cylinder 1 into the reserved slot of the flange 10 and then perform fillet welding. This method offers high positioning accuracy and can withstand certain tensile, compressive, and shear forces. It is suitable for parts requiring precise positioning and subject to complex stresses. (Refer to the attached document.) Figure 4 The diagram shows a structural schematic of the inner cylinder 1 being connected by fillet welding after the end of the flange 10 is inserted into the reserved slot. In T-joint welding, the load-bearing lug 9 or inner cylinder 1 forms a T-shaped joint with the flange 10. The weld seams are distributed on both sides of the joint, effectively dispersing the stress at the joint. Compared to ordinary butt welding, T-joints have stronger resistance to deformation when subjected to loads perpendicular to the plane of flange 10. Figure 5 The diagram shows a T-joint welded structure formed between the inner cylinder and flange 10.

[0038] In this embodiment, the weld height of the insert fillet weld is 8-12mm, and the weld height of the T-joint is 10-15mm. A reasonable weld height ensures that the welded joint will not break during long-term use, while also preventing component deformation due to excessive weld height.

[0039] In this embodiment, a header is provided at the outlet or inlet of the riser pipe 4. The heat exchange coil 3 is butt-welded to the header, forming a continuous flow channel. Simultaneously, the butt weld can be inspected using radiographic testing, thus ensuring welding quality. Non-destructive testing is performed on the butt weld between the small header and the double coil, with a pass rate of ≥99% to ensure welding strength and prevent weld cracking.

[0040] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

Claims

1. A high-efficiency heat transfer dual-coil riser heat exchanger structure, characterized in that, It includes a riser pipe (4), an inner cylinder (1), a heat exchange coil (3) and an outer cylinder (2) arranged sequentially from the inside to the outside. The inner wall of the riser pipe (4) is provided with a heat-conducting mesh structure (5), and the inner wall of the riser pipe (4) is provided with a heat-conducting coating (6) on the inner side of the heat-conducting mesh structure (5).

2. The high-efficiency heat transfer dual-coil riser heat exchanger structure according to claim 1, characterized in that, The heat-conducting mesh structure (5) is a honeycomb tortoise shell mesh.

3. The high-efficiency heat transfer dual-coil riser heat exchanger structure according to claim 2, characterized in that, The heat-conducting mesh structure (5) is made of heat-resistant steel and is welded and fixedly installed on the inner wall of the riser pipe (4).

4. The high-efficiency heat transfer dual-coil riser heat exchanger structure according to claim 1, characterized in that, The riser pipe (4) includes a bottom pipe section and an upper pipe section located above the bottom pipe section. The bottom pipe section is provided with a heat insulation coating (8) inside the heat-conducting mesh structure (5), and the upper pipe section is provided with a heat-conducting coating (6) inside the heat-conducting mesh structure (5).

5. The high-efficiency heat transfer dual-coil riser heat exchanger structure according to claim 1, characterized in that, The heat exchange coil (3) consists of at least two coils.

6. The high-efficiency heat transfer dual-coil riser heat exchanger structure according to claim 1, characterized in that, The riser pipe (4) is provided with a flange (10). The bottom of the outer cylinder (2) is provided with load-bearing lugs (9) spaced circumferentially. The load-bearing lugs (9) are connected and fixed to the flange (10) at the bottom of the riser pipe (4), or The flanges (10) at the upper and lower ends of the riser pipe (4) are respectively connected and fixed to the inner cylinder (1).

7. The high-efficiency heat transfer dual-coil riser heat exchanger structure according to claim 6, characterized in that, The load-bearing lug (9) or inner cylinder (1) is welded to the flange (10).

8. The high-efficiency heat transfer dual-coil riser heat exchanger structure according to claim 7, characterized in that, The load-bearing lug (9) or inner cylinder (1) is connected to the flange (10) by insert fillet weld or T-weld.

9. The high-efficiency heat transfer dual-coil riser heat exchanger structure according to claim 8, characterized in that, The weld height for insert fillet welds is 8-12mm, and the weld height for T-joint welds is 10-15mm.

10. The high-efficiency heat transfer dual-coil riser heat exchanger structure according to claim 1, characterized in that, The riser (4) is provided with a header at its outlet or inlet, and the heat exchange coil (3) is butt-welded to the header.

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