An inner membrane replaceable riser heat exchanger

Abstract

This invention relates to a riser heat exchanger with a replaceable inner membrane, comprising mounting flanges at both ends, an inner jacket, an outer jacket, and heat exchange tubes; the outer jacket is fixedly connected to the mounting flanges, and the two ends of the inner jacket are connected to the outer jacket via support and limiting components; it also includes several sets of inner membrane replacement assemblies arranged in a ring array around the riser heat exchanger; each set of inner membrane replacement assemblies includes an inner membrane body and an external rotating tensioning mechanism; after the riser heat exchanger has been operating for a period of time, the external rotating tensioning mechanism can be driven to replace the inner membrane body, with the dirty inner membrane body being pulled to the outside and the clean inner membrane body being pulled to the inside, thereby maintaining the relative cleanliness of the inner cylinder of the riser heat exchanger's inner jacket for a long time.

Description

Technical Field

[0001] This invention relates to heat exchange equipment, and more particularly to a riser heat exchanger with a replaceable inner membrane. Background Technology

[0002] Research on waste heat recovery technology from raw coke oven gas began in the 1980s, but due to the thermal properties of raw coke oven gas and safety issues in coke oven production, the recovery of waste heat from raw coke oven gas has not progressed smoothly.

[0003] Waste heat recovery from raw coal gas is usually achieved using riser heat exchangers. However, in current riser heat exchangers, the raw coal gas at the bottom of the riser is not cooled in time, which can easily cause some organic matter to undergo carbonization and produce a large amount of graphite. At the end of the riser, the raw coal gas temperature is low, and tar is often liquefied and drawn out. Due to these two reasons, the riser often becomes blocked, affecting the normal flow of raw coal gas and consequently affecting the safety and stability of the coke oven system.

[0004] Chinese patent application CN202121455233.2 discloses a stable and reliable riser heat exchanger. It involves an inner lining coating on the inner surface of the inner jacket, which is fixed to the inner cylinder via a hexagonal mesh. This technical solution primarily aims to isolate the inner cylinder of the riser from corrosion by raw coal gas, thus solving the problems of coking and smoke emission from the riser. However, considering the actual operating conditions of the riser heat exchanger, the inner lining coating will inevitably experience irreversible wear under long-term exposure to high-temperature and highly corrosive environments. Once the coating wears down, the coking and carbon buildup problems will become increasingly severe. Therefore, while the above technical solution can extend the service life of the riser heat exchanger, it cannot fundamentally solve the impact of harsh operating conditions on the heat exchanger. Summary of the Invention

[0005] To address the aforementioned technical problems and provide a riser heat exchanger capable of long-term use, this invention offers the following technical solution:

[0006] A riser heat exchanger with replaceable inner membrane includes mounting flanges at both ends, an inner jacket, an outer jacket, and heat exchange tubes; the outer jacket is fixedly connected to the mounting flanges, and the two ends of the inner jacket are connected to the outer jacket via support and limiting components; the heat exchange tubes are disposed inside the inner and outer jackets, with both ends extending out of the outer jacket; it also includes several sets of inner membrane replacement components arranged in a ring array around the riser heat exchanger; the sets of inner membrane replacement components are not connected to each other;

[0007] Each inner membrane replacement assembly includes an inner membrane body and an external rotating tensioning mechanism; the inner membrane body includes a connecting part, a sealing part, and a mesh part; the mesh part is disposed close to the inner cylinder of the inner jacket, and its two ends are connected to the connecting part through the sealing part; the connecting part extends out of the outer jacket through support and limiting components disposed at both ends of the inner jacket, and is tensioned and limited by the external rotating tensioning mechanism; the sealing part is used to seal the inner membrane body inside the inner jacket.

[0008] After working for a period of time, the external rotation tensioning mechanism can be driven to replace the inner membrane body. The dirty inner membrane body is pulled to the outside, and the clean inner membrane body is pulled to the inside.

[0009] Furthermore, the support and limiting assembly has an "F"-shaped structure and is positioned at the corresponding positions of each group of inner membrane replacement assemblies; the support and limiting assembly includes a mounting plate, a first limiting plate, and a second limiting plate; the mounting plate is parallel to the mounting flange, with one end extending into the inner sleeve and the other end extending out of the outer sleeve; the mounting plate is fixedly connected to the outer sleeve; the first limiting plate and the second limiting plate are perpendicular to the mounting plate; the inner sleeve is sandwiched between the first limiting plate and the second limiting plate, and its upper and lower ends abut against the mounting plate;

[0010] The second limiting plate and the mounting plate form a channel for the inner membrane body to pass through; the sealing part is engaged at the free end of the second limiting plate and can slide in the channel under the action of external force.

[0011] The support and limiting component of this invention serves both to limit the inner jacket and to provide a channel for the inner membrane replacement component to operate. In this invention, the inner jacket and the support and limiting component are not welded, allowing the inner jacket a certain amount of free expansion space. The external rotating tensioning mechanism is used for the tensioning and rotation of the interconnected inner membrane bodies.

[0012] Furthermore, the sealing part is wedge-shaped, comprising interconnected semi-cylindrical and triangular prism sections, and can completely block the end of the channel located inside the inner jacket. This sealing part can serve a sealing function on the one hand, and on the other hand, its triangular prism section can clean the channel during the replacement of the inner membrane body, preventing dirt from the inner membrane body from accumulating in the channel.

[0013] Furthermore, the width of the connecting part is the same as that of the sealing part; the width of the mesh part is wider than that of the sealing part, and the mesh part is made of flexible high-temperature resistant material. Since the sealing part has a certain thickness, the mesh part can be designed to be slightly wider than the connecting part. It can be bent appropriately before entering the body and naturally unfolded after entering the body, so as to maximize the expansion and coverage of the inner jacket inner cylinder area.

[0014] Furthermore, adjacent inner membrane bodies can be connected by a connector, facilitating the connection of inner membrane bodies outside the heat exchanger and ensuring the sustainability of the inner membrane replacement assembly.

[0015] Furthermore, the inner membrane replacement assembly is configured with 6 sets, which improves the overall stability of the structure.

[0016] Furthermore, the mesh section is made of a flexible thermally conductive material, which not only ensures the cleanliness of the heat exchanger interior but also reduces heat loss caused by the additional structure, ensuring waste heat recovery efficiency.

[0017] Furthermore, the inner wall of the channel is coated with a lubricating coating to ensure smooth operation of the inner membrane replacement assembly.

[0018] Furthermore, the free end of the second limiting plate extends towards the center from the side near the sealing part, which can reduce the impact of raw coal gas on the supporting limiting component and the sealing part, and prevent the sealing part from failing.

[0019] The inner membrane replacement assembly of the present invention enables the replacement of the inner membrane body without stopping the machine, thereby maintaining the relative cleanliness of the inner cylinder of the jacket of the riser heat exchanger for a long time. Attached Figure Description

[0020] Figure 1 A schematic diagram of the main structure of the present invention;

[0021] Figure 2 , Figure 1 Enlarged view of section A;

[0022] Figure 3 A schematic diagram of the connection positions of the inner membrane body, the inner jacket, and the outer jacket of the present invention;

[0023] Figure 4 A schematic diagram of the inner membrane body structure of the present invention;

[0024] Figure 5 A schematic diagram of the sealing part structure of the present invention.

[0025] In the diagram: 1. Mounting flange; 2. Inner jacket; 3. Outer jacket; 4. Heat exchange tube; 5. Support and limiting assembly; 51. Mounting plate; 52. First limiting plate; 53. Second limiting plate; 54. Channel; 6. Inner membrane replacement assembly; 61. Inner membrane body; 611. Connecting part; 612. Sealing part; 613. Mesh part; 62. External rotating tensioning mechanism. Detailed Implementation

[0026] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0027] Example 1

[0028] like Figure 1-4 The diagram illustrates a riser heat exchanger with a replaceable inner membrane, comprising mounting flanges 1 at both ends, an inner jacket 2, an outer jacket 3, and heat exchange tubes 4; the outer jacket 3 is fixedly connected to the mounting flanges 1, and the inner jacket 2 is connected to the outer jacket 3 at both ends via support and limiting components 5; the heat exchange tubes 4 are disposed inside the inner jacket 2 and the outer jacket 3, with both ends extending out of the outer jacket 3; it also includes several sets of inner membrane replacement components arranged in a ring array around the riser heat exchanger; the sets of inner membrane replacement components are not connected to each other;

[0029] Each inner membrane replacement assembly includes an inner membrane body 61 and an external rotating tensioning mechanism 62. The inner membrane body 61 includes a connecting part 611, a sealing part 612, and a mesh part 613. The mesh part 613 is disposed close to the inner cylinder of the inner jacket 2, and its two ends are connected to the connecting part 611 through the sealing part 612. The connecting part 611 extends out of the outer jacket 3 through support and limiting components 5 disposed at both ends of the inner jacket 2, and is tensioned and limited by the external rotating tensioning mechanism 62. The sealing part 612 is used to seal the inner membrane body 61 inside the inner jacket 2. In this embodiment, the external rotating tensioning mechanism 62 mainly includes a tensioning roller and a traction roller, which can tension and traction the interconnected inner membrane bodies 61.

[0030] The support and limiting assembly 5 has an "F" shaped structure and is set at the corresponding position of each group of inner membrane replacement assemblies; the support and limiting assembly includes a mounting plate 51, a first limiting plate 52, and a second limiting plate 53; the mounting plate 51 is set parallel to the mounting flange 1, with one end extending into the inner sleeve 2 and the other end extending out of the outer sleeve 3; the mounting plate 51 is fixedly connected to the outer sleeve 3; the first limiting plate 52 and the second limiting plate 53 are set perpendicular to the mounting plate 51; the inner sleeve 2 is sandwiched between the first limiting plate 52 and the second limiting plate 53, and its upper and lower ends abut against the mounting plate 51; the inner sleeve 2 is not welded to the support and limiting assembly 5.

[0031] The second limiting plate 53 and the mounting plate 51 form a channel 54 through which the inner membrane body 61 can pass; the sealing part 612 is engaged at the free end of the second limiting plate 53 and can slide in the channel 54 under the action of external force.

[0032] The sealing part 612 is wedge-shaped, comprising interconnected semi-cylindrical and triangular prism sections, and can completely block the end of the channel 54 located inside the inner jacket 2. This sealing part 612 serves two purposes: firstly, it provides a seal; secondly, its triangular prism section helps clean the channel 54 during the replacement of the inner membrane body 61, preventing dirt from accumulating inside the channel 54. In this embodiment, the sealing part 612 can be designed as a metal material with a certain degree of elasticity, which can better achieve a sealing effect after thermal expansion during operation. Additionally, to improve sealing performance, a sealing plug can also be added to the end of the mounting plate 51 extending out of the outer jacket 3.

[0033] The width of the connecting part 611 is the same as that of the sealing part 612; the width of the mesh part 613 is wider than that of the sealing part 612, and the mesh part 613 is made of flexible high-temperature resistant material. Since the sealing part 612 has a certain thickness, the mesh part 613 can be designed to be slightly wider than the connecting part 611. It can be bent appropriately before entering the body and unfold naturally after entering the body, so as to maximize the expansion of the inner cylinder area of ​​the inner jacket 2.

[0034] Adjacent inner membrane bodies 61 can be connected by a connector 611, facilitating the connection of inner membrane bodies 61 outside the heat exchanger and ensuring the sustainability of the inner membrane replacement assembly.

[0035] In this embodiment, the inner membrane replacement assembly is set with 6 sets, which improves the overall stability of the structure.

[0036] The mesh section 613 is made of flexible thermally conductive material, which not only ensures the cleanliness of the heat exchanger interior but also reduces heat loss caused by the additional structure, ensuring waste heat recovery efficiency.

[0037] The inner wall of the channel 54 is coated with a lubricating coating, which in this embodiment is a high-temperature resistant ceramic coating.

[0038] The free end of the second limiting plate 53 extends towards the center from the side near the sealing part 612, which can reduce the impact of raw coal gas on the supporting limiting component 5 and the sealing part 612 and prevent the sealing part 612 from failing.

[0039] The riser heat exchanger of the present invention can rotate the inner membrane body 61 by means of an external rotating tensioning mechanism 62 during its working interval until the sealing part 612 of the new inner membrane body 61 is engaged with both ends of the second limiting plate 53, thereby enabling rapid membrane replacement without opening the cover.

[0040] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A riser heat exchanger with a replaceable inner membrane, comprising mounting flanges at both ends, an inner jacket, an outer jacket, and heat exchange tubes; the outer jacket is fixedly connected to the mounting flanges, and the inner jacket is connected to the outer jacket at both ends via support and limiting components; the heat exchange tubes are disposed inside the inner and outer jackets, and extend out of the outer jacket at both ends; characterized in that: It also includes several sets of inner membrane replacement assemblies arranged in a ring array around the riser heat exchanger; the sets of inner membrane replacement assemblies are not connected to each other. Each inner membrane replacement assembly includes an inner membrane body and an external rotating tensioning mechanism; the inner membrane body includes a connecting part, a sealing part, and a mesh part; the mesh part is disposed close to the inner cylinder of the inner jacket, and its two ends are connected to the connecting part through the sealing part; the connecting part extends out of the outer jacket through support and limiting components disposed at both ends of the inner jacket, and is tensioned and limited by the external rotating tensioning mechanism; the sealing part is used to seal the inner membrane body inside the inner jacket; The support and limiting assembly has an "F" shaped structure and is positioned at the corresponding positions of each set of inner membrane replacement assemblies. The support and limiting assembly includes a mounting plate, a first limiting plate, and a second limiting plate. The mounting plate is parallel to the mounting flange, with one end extending into the inner sleeve and the other end extending out of the outer sleeve. The mounting plate is fixedly connected to the outer sleeve. The first and second limiting plates are perpendicular to the mounting plate. The inner sleeve is sandwiched between the first and second limiting plates, with its upper and lower ends abutting against the mounting plate. The second limiting plate and the mounting plate form a channel for the inner membrane body to pass through; the sealing part is engaged with the free end of the second limiting plate and slides in the channel under the action of external force; When changing the membrane, the external rotating tensioning mechanism is used to pull the inner membrane body to rotate until the sealing part of the new inner membrane body is engaged with both ends of the second limiting plate.

2. The riser heat exchanger with replaceable inner membrane as described in claim 1, characterized in that: The sealing part is wedge-shaped as a whole and includes a semi-cylindrical section and a triangular prism section that are connected to each other, and can completely block the end of the channel located inside the inner jacket.

3. The riser heat exchanger with replaceable inner membrane as described in claim 1, characterized in that: The width of the connecting part is the same as that of the sealing part; the width of the mesh part is wider than that of the sealing part, and the mesh part is made of a flexible high-temperature resistant material.

4. A riser heat exchanger with a replaceable inner membrane as described in claim 1, characterized in that: Adjacent endometrial bodies are connected by a connector.

5. A riser heat exchanger with a replaceable inner membrane as described in claim 1, characterized in that: The inner membrane replacement assembly is configured in 6 sets.

6. A riser heat exchanger with a replaceable inner membrane as described in claim 1, characterized in that: The mesh section is made of a flexible thermally conductive material.

7. A riser heat exchanger with a replaceable inner membrane as described in claim 1, characterized in that: The inner wall of the channel is coated with a lubricating coating.

8. A riser heat exchanger with a replaceable inner membrane as described in claim 1, characterized in that: The free end of the second limiting plate extends towards the center from the side near the sealing part.

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