Flue gas waste heat recovery equipment with heat exchange pipes capable of being sealed in single expansion mode

By designing a single expansion-sealable heat exchange tube structure in the flue gas waste heat recovery equipment, and using sealing fillers to achieve independent expansion and sealing, the expansion joint deformation and weld defragment caused by flue gas temperature changes and flow fluctuations are solved. Ensure the long-term safe and stable operation of the equipment and efficient waste heat recovery.

CN222143840UActive Publication Date: 2024-12-10SHANDONG DAIRONG ENERGY SAVING ENVIRONMENTAL PROTECTION TECH
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Patent Information

Application Number
CN202420183356.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-01-25
Publication Date
2024-12-10
Estimated Expiration
2034-01-25

AI Technical Summary

Technical Problem

The existing flue gas waste heat recovery equipment has inconsistent expansion of the heat exchange pipe under flue gas temperature changes and flow fluctuations, resulting in deformation of the expansion joints and weld decracking, affecting the sealing and safe operation of the equipment.

Method used

A device for single expansion and sealing of heat exchange tubes is designed. By setting up heat exchange tubes, left sealing sleeves, right sealing sleeves and guide sleeves in the shell, independent expansion and sealing is achieved using sealing fillers to ensure that each piece is replaced. The heat pipe can expand and seal independently under temperature changes and flow fluctuations.

Benefits of technology

The independent expansion and sealing of each heat exchange tube is achieved, which avoids the deformation of the expansion joint and weld decracking problems, ensures the long-term safe and stable operation of the equipment, and improves the utilization rate and economic benefits of the equipment.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to flue gas waste heat recovery equipment with a single heat exchange tube capable of expanding and sealing, which comprises a shell, a heat exchange tube expanding and sealing assembly is arranged in the shell, and the heat exchange tube expanding and sealing assembly comprises a heat exchange tube, a left sealing sleeve, a right sealing sleeve, a sealing filler and a guide sleeve. The left sealing sleeve and the right sealing sleeve are arranged on the outer wall of the heat exchange pipe in a sleeving mode, the space between the left sealing sleeve and the right sealing sleeve is filled with sealing filler, and the outer wall of the left sealing sleeve and the outer wall of the right sealing sleeve are sleeved with the guide sleeve. A first supporting tube plate and a second supporting tube plate which are used for supporting the heat exchange tube expansion sealing assembly are fixedly connected into the shell. As each heat exchange tube is independently expanded and sealed, the heat exchange tubes do not influence each other during flue gas heat exchange, so that the equipment can safely and stably run for a long time, and the problem of weld joint cracking caused by deformation of an expansion joint due to large expansion amount difference of each heat exchange tube and under flue gas flow fluctuation in the traditional equipment is solved.
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Description

Technical Field

[0001] The utility model relates to the technical field of flue gas waste heat recovery equipment, in particular to a flue gas waste heat recovery equipment in which a single heat exchange tube can be expanded and sealed. Background Art

[0002] At present, the domestic metallurgical and steel industries suffer from large exhaust losses. Although waste heat recovery equipment has been added to the tail flue gas of many devices, due to the nature of the flue gas and other reasons, some heat exchange equipment often has problems with sealing and expansion, resulting in a decrease in equipment utilization, which in turn affects the efficiency of the entire device and reduces economic benefits. When the waste heat recovery equipment has problems and is out of service, the direct discharge of untreated high-temperature flue gas will also cause certain pollution to the environment.

[0003] The waste heat recovery tubular air heat exchanger heats the cold air through the high-temperature flue gas at the tail of the power generation device, heats the air to a certain temperature and returns it to the device for use, while the flue gas cools down and enters the subsequent dust collector. Although the waste heat is recovered, the large temperature difference between the flue gas inlet and outlet, and the large fluctuation of the flue gas flow, lead to inconsistent expansion of the heat exchange tubes at various locations. If an integral expansion joint is used to absorb the expansion, the expansion joint will be deformed and the weld will be cracked due to the large difference in expansion between the inlet and outlet sides, and the continuous fluctuation of the flue gas flow, which will cause problems with the expansion seal of the entire heat exchanger. In severe cases, the equipment will vibrate, affecting the safe operation of the entire device. Therefore, it is necessary to design a flue gas waste heat recovery device with a single heat exchange tube that can expand and seal to meet this demand and ensure the long-term safe and stable operation of the waste heat recovery equipment. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a flue gas waste heat recovery device with a single heat exchange tube capable of expansion and sealing, which can ensure long-term safe and stable operation of the waste heat recovery device when the flue gas temperature changes greatly and the flue gas flow fluctuates greatly.

[0005] The utility model is realized through the following technical scheme: a flue gas waste heat recovery device in which a single heat exchange tube can be expanded and sealed, comprising a shell, a heat exchange tube expansion sealing assembly is arranged in the shell, the heat exchange tube expansion sealing assembly comprises a heat exchange tube, a left sealing sleeve, a right sealing sleeve, a sealing filler and a guide sleeve, the left sealing sleeve and the right sealing sleeve are both sleeved on the outer wall of the heat exchange tube, the sealing filler is filled between the left sealing sleeve and the right sealing sleeve, and the guide sleeve is sleeved on the outer wall of the left sealing sleeve and the right sealing sleeve.

[0006] In this solution, when the heat exchange tube expands due to heat, the heat exchange tube and the left sealing sleeve expand to the right together, thereby compacting the sealing filler between the left sealing sleeve and the right sealing sleeve. In this way, a single heat exchange tube can expand and seal independently, avoiding the problem of large difference in the expansion amount of the heat exchange tube and deformation of the expansion joint and cracking of the weld under flue gas flow fluctuations, thereby ensuring the long-term safe and stable operation of the heat exchange equipment.

[0007] As an optimization, the left sealing sleeve is fixedly connected to the heat exchange tube, the right sealing sleeve is fixedly connected to the guide sleeve, and both ends of the heat exchange tube are connected to the outer wall of the shell to form an air circulation channel. This optimization scheme realizes the synchronous movement of the heat exchange tube and the left sealing sleeve, and the right sealing sleeve and the guide sleeve are connected as one.

[0008] As an optimization, a first support tube sheet is fixedly connected in the shell, and one end of the heat exchange tube passes through the first support tube sheet and is fixedly connected to the first support tube sheet. In this optimization solution, the first support tube sheet is used to support and limit the heat exchange tube.

[0009] As an optimization, a second support tube sheet is fixedly connected in the shell, and the guide sleeve passes through the second support tube sheet and is fixedly connected to the second support tube sheet. In this optimization solution, the second support tube sheet is used to support and limit the guide sleeve.

[0010] As an optimization, the outer walls on both sides of the shell connected to the air circulation channel are respectively fixed with an air inlet interface and an air outlet interface. This optimization solution facilitates the two ends of the shell to be connected to the air pipeline and the heat exchange device as a whole.

[0011] As an optimization, a smoke flow channel perpendicular to the air flow channel is provided in the shell, and the two outer walls of the shell connected to the smoke flow channel are respectively fixed with a smoke inlet interface and a smoke outlet interface. This optimization scheme facilitates the connection of both ends of the shell with the smoke pipe and the heat exchange equipment into a whole.

[0012] As an optimization, multiple groups of the heat exchange tube expansion sealing components are arranged in the shell along the direction of the smoke flow channel. This optimization scheme uses multiple groups of heat exchange tube expansion sealing components, each heat exchange tube can be sealed and expanded independently without affecting each other, and the safe operation of the equipment will not be affected by the different expansion of the heat exchange tubes in the high temperature zone and the low temperature zone.

[0013] The beneficial effects of the utility model are as follows: the flue gas waste heat recovery equipment with a single expansion and sealing structure of the heat exchange tube, since each heat exchange tube is independently expanded and sealed, does not affect each other during flue gas heat exchange, so that the equipment can operate safely and stably for a long time, avoiding the problem of deformation of the expansion joint and cracking of the weld due to the large difference in the expansion amount of each heat exchange tube and the fluctuation of the flue gas flow in traditional equipment. The utility model equipment has a simple structure, strong versatility, short manufacturing period, and low cost, which can ensure that the heat exchanger can achieve the advantages of both sufficient waste heat recovery and long-term stable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a half-section view of the utility model;

[0015] Figure 2 It is a heat exchange tube expansion sealing assembly of the utility model;

[0016] Figure 3 yes Figure 1 An enlarged view of the point A where the first supporting tube sheet is connected to the heat exchange tube;

[0017] Figure 4 yes Figure 1 An enlarged view of the B point where the second supporting tube sheet is connected to the guide sleeve;

[0018] As shown in the figure:

[0019] 1. First supporting tube sheet, 2. Shell, 3. Smoke inlet interface, 4. Air outlet interface, 5. Second supporting tube sheet, 6. Heat exchange tube expansion seal assembly, 7. Heat exchange tube, 8. Left sealing sleeve, 9. Sealing filler, 10. Guide sleeve, 11. Right sealing sleeve, 12. Smoke outlet interface, 13. Air inlet interface, 14. Welding point one, 15. Welding point two, 16. Welding point three, 17. Welding point four, 18. Welding point five, 19. Welding point six. DETAILED DESCRIPTION

[0020] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0021] like Figures 1 to 4 As shown, a flue gas waste heat recovery device in which a single heat exchange tube can be expanded and sealed comprises a shell 2, such as Figure 1 As shown, the direction of smoke flow in the shell 2 is from top to bottom to form a vertical smoke flow channel, and the direction of air flow is from left to right to form a horizontal air flow channel. Smoke flows outside the heat exchange tube 7, and air flows inside the heat exchange tube 7, thereby forming a cross-flow heat exchange. The left and right side walls of the shell 2 are respectively fixed with an air inlet interface 13 and an air outlet interface 4 connected to the air flow channel, and the upper and lower outer walls of the shell 2 are respectively fixed with a smoke inlet interface 3 and a smoke outlet interface 12 connected to the smoke flow channel.

[0022] The shell 2 of this embodiment is a rectangular box structure composed of a cubic steel frame and plates welded to the front and rear sides of the steel frame. The upper, lower, left and right sides of the shell are opened, and thermal insulation cotton is fixedly laid on the front and rear side walls of the shell. The smoke inlet interface 3, the smoke outlet interface 12, the air inlet interface 13 and the air outlet interface 4 are all trapezoidal box structures welded by plates. The large end face and the small end face of the trapezoidal box structure are opened, and the shape and size of the large end face of the trapezoidal box structure are the same as the end face size of the steel frame. The plates used are selected from carbon steel or stainless steel according to the temperature and properties of the hot and cold side fluids, and the steel is channel steel.

[0023] The shell 2 is provided with a plurality of heat exchange tube expansion sealing assemblies 6 arranged along the direction of the smoke flow channel. Figure 2 As shown, the heat exchange tube expansion sealing assembly 6 includes a heat exchange tube 7, a left sealing sleeve 8, a right sealing sleeve 11, a sealing filler 9 and a guide sleeve 10. The left sealing sleeve 8 and the right sealing sleeve 11 are both sleeved on the outer wall of the heat exchange tube 7. The sealing filler 9 is filled between the left sealing sleeve 8 and the right sealing sleeve 11. The guide sleeve 10 is sleeved on the outer walls of the left sealing sleeve 8 and the right sealing sleeve 11. The left sealing sleeve 8 is fixedly connected to the heat exchange tube 7, and the right sealing sleeve 11 is fixedly connected to the guide sleeve 10. Both ends of the heat exchange tube 7 are connected to the outer wall of the shell 2 to form an air circulation channel.

[0024] like Figure 2 As shown, the length of the guide sleeve 10 in this embodiment is one fifth of the length of the heat exchange tube 7, and the length of the left sealing sleeve 8 and the right sealing sleeve 11 is one quarter of the length of the guide sleeve 10. The inner walls of the left sealing sleeve 8 and the right sealing sleeve 11 are sealed and fitted with the outer wall of the heat exchange tube 7, and the outer walls of the left sealing sleeve 8 and the right sealing sleeve 11 are sealed and fitted with the inner wall of the guide sleeve 10. The sealing packing 9 is tightly filled between the left sealing sleeve 8 and the right sealing sleeve 11. The selection and length of the sealing packing 9 need to be selected according to the temperature resistance and expansion amount. The left sealing sleeve 8 and the right sealing sleeve 11 are arranged on one side of the heat exchange tube 7. The left sealing sleeve 8 and the heat exchange tube 7 are fully welded and fixed at the welding point 14, and the right sealing sleeve 11 and the guide sleeve 10 are fully welded and fixed at the welding point 2 15.

[0025] The shell 2 is fixed with a first support tube sheet 1 and a second support tube sheet 5, and one end of the heat exchange tube 7 passes through the first support tube sheet 1 and is fixed to the first support tube sheet 1. The guide sleeve 10 passes through the second support tube sheet 5 and is fixed to the second support tube sheet 5.

[0026] like Figure 3 , 4 As shown, the first support tube sheet 1 is fully welded and fixed to the channel steel frame of the left side wall of the shell 2 at the welding point 4 17, and the second support tube sheet 5 is fully welded and fixed to the channel steel frame of the right side wall of the shell 2 at the welding point 6 19.

[0027] In this embodiment, the first support tube sheet 1 and the second support tube sheet 5 are made of carbon steel or stainless steel plates. The size of the first support tube sheet 1 and the second support tube sheet 5 is the same as the size of the left and right ports of the shell 2. The first support tube sheet 1 and the second support tube sheet 5 are respectively sealed and fixed to the left and right ports of the shell 2. The first support tube sheet 1 and the second support tube sheet 5 are respectively provided with a plurality of through holes according to the arrangement pattern of the plurality of groups of heat exchange tube expansion sealing components 6. The heat exchange tube 7 passes through the through hole and is fully welded and fixed to the first support tube sheet 1 at the welding point three 16 position, and the guide sleeve 10 passes through the through hole and is fully welded and fixed to the second support tube sheet 5 at the welding point five 18 position.

[0028] Working principle: When in use, external high-temperature flue gas enters the shell 2 from the upper flue gas inlet interface 3, and the high-temperature flue gas flows downward through the flue gas flow channel to contact and exchange heat with the outer wall of the heat exchange tube 7 of the heat exchange tube expansion sealing assembly 6. External cold air is introduced by the fan into the air inlet interface 13 and enters the heat exchange tube 7 of the heat exchange tube expansion sealing assembly to exchange heat with the external high-temperature flue gas. After the high-temperature flue gas is cooled by heat exchange, it is led out from the flue gas outlet interface 12 to the subsequent equipment such as the dust collector. After the cold air in the heat exchange tube 7 is heated up by heat exchange, it flows out from the air outlet interface 4 to the subsequent equipment for processing.

[0029] During the heat exchange process, when the temperature difference between flue gas and air is large and the flue gas flow fluctuates greatly, if the conventional integral expansion joint is used, the expansion amount of each heat exchange tube is greatly different and the flue gas flow fluctuates, the expansion joint will be deformed and the weld will be cracked, which will cause problems with the sealing of the entire equipment and the equipment will vibrate, thus affecting the safe operation of the entire device. Now, the new heat exchange tube can be expanded and sealed in a single structure. Since the heat exchange tube 7 in each heat exchange tube expansion sealing assembly 6 expands and seals independently, when the heat exchange tube 7 expands due to heat, the heat exchange tube 7 expands to the right together with the left sealing sleeve 8, thereby compressing the sealing filler 9 to enhance the sealing effect. Each heat exchange tube expansion sealing assembly 6 can expand and adjust accordingly according to different temperatures and flue gas flow fluctuations. The heat exchange tubes 7 do not affect each other, ensuring that the equipment can operate safely and stably for a long time.

[0030] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved by or by adopting the existing technology, which will not be repeated here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not deviate from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A flue gas waste heat recovery device in which a single heat exchange tube can be expanded and sealed, comprising a housing (2), Features: A heat exchange tube expansion sealing assembly (6) is provided in the shell (2), and the heat exchange tube expansion sealing assembly (6) comprises a heat exchange tube (7), a left sealing sleeve (8), a right sealing sleeve (11), a sealing filler (9) and a guide sleeve (10). The left sealing sleeve (8) and the right sealing sleeve (11) are both sleeved on the outer wall of the heat exchange tube (7), the sealing filler (9) is filled between the left sealing sleeve (8) and the right sealing sleeve (11), and the guide sleeve (10) is sleeved on the outer walls of the left sealing sleeve (8) and the right sealing sleeve (11).

2. A flue gas waste heat recovery device with a single heat exchange tube capable of expansion and sealing according to claim 1, Features: The left sealing sleeve (8) is fixedly connected to the heat exchange tube (7), the right sealing sleeve (11) is fixedly connected to the guide sleeve (10), and both ends of the heat exchange tube (7) are connected to the outer wall of the shell (2) to form an air circulation channel.

3. According to claim 1, a flue gas waste heat recovery device with a single heat exchange tube capable of expansion and sealing, Features: A first supporting tube sheet (1) is fixedly connected inside the shell (2), and one end of the heat exchange tube (7) passes through the first supporting tube sheet (1) and is fixedly connected to the first supporting tube sheet.

4. The flue gas waste heat recovery device with a single heat exchange tube capable of expansion and sealing according to claim 1, Features: A second supporting tube sheet (5) is fixedly connected inside the shell (2), and the guide sleeve (10) passes through the second supporting tube sheet (5) and is fixedly connected to the second supporting tube sheet.

5. The flue gas waste heat recovery device with a single heat exchange tube capable of expansion and sealing according to claim 2, Features: An air inlet interface (13) and an air outlet interface (4) are respectively fixedly connected to the outer walls of the housing (2) on both sides of the housing that are connected to the air circulation channel.

6. A flue gas waste heat recovery device with a single heat exchange tube capable of expansion and sealing according to claim 2, Features: A smoke flow channel perpendicular to the air flow channel is provided in the shell (2), and two outer walls of the shell (2) communicating with the smoke flow channel are respectively fixedly connected with a smoke inlet interface (3) and a smoke outlet interface (12).

7. A flue gas waste heat recovery device with a single heat exchange tube capable of expansion and sealing according to claim 6, Features: A plurality of groups of heat exchange tube expansion sealing assemblies (6) are arranged in the shell (2) along the direction of the smoke flow channel.