Boiler high-temperature flue with waste heat recovery function

Abstract

The boiler high-temperature flue with the waste heat recovery function comprises a smoke pipe (1) and a sleeve (2) which are arranged in a nested mode inside and outside, a plurality of first partition plates (101) and a plurality of second partition plates (102) are annularly distributed on the periphery of the smoke pipe (1), and the first partition plates (101) and the second partition plates (102) are arranged alternately. Openings are formed in the top of the first partition plate (101) and the bottom of the second partition plate (102); a plurality of connecting parts (3) attached to the first partition plate (101) or the second partition plate (102) are annularly distributed on the inner side of the sleeve (2), an S-shaped heat exchange channel is formed between the sleeve (2) and the smoke pipe (1) through the first partition plate (101), the second partition plate (102) and the connecting parts (3), and a heat exchange inlet pipe (4) and a heat exchange outlet pipe (5) which are connected with the sleeve (2) are arranged at the two ends of the heat exchange channel respectively. The heat exchanger has the characteristics of good working stability and high heat exchange efficiency, and is convenient for manufacturers to process.

Description

Technical Field

[0001] This utility model relates to a boiler heat exchange mechanism, and in particular to a boiler high-temperature flue with waste heat recovery function. Background Technology

[0002] The current method for treating boiler flue gas involves discharging high-temperature flue gas through flue gas ducts and then transporting it to a tubular air preheater, where the air preheater exchanges heat with the flue gas, thus achieving heat recovery from the boiler flue gas. Building on this, to further improve the utilization rate of heat energy in the boiler flue gas, manufacturers also install heat exchange mechanisms on the outside of the flue gas ducts. These mechanisms facilitate heat exchange with the high-temperature flue gas inside the ducts, reducing heat loss during transport and further lowering the temperature of the high-temperature flue gas after the two heat exchange processes, thus facilitating subsequent equipment processing. Simultaneously, manufacturers can maximize the recovery of heat energy from the high-temperature flue gas, achieving energy-saving effects.

[0003] Based on the heat exchange function of high-temperature flue gas in flue gas ducts, two heat exchange mechanisms are commonly used. The first is to install a sleeve on the outside of the flue gas duct, forming a sealed heat exchange chamber between the sleeve and the flue gas duct. Manufacturers can then continuously fill the heat exchange chamber with heat carrier to achieve the heat exchange function. However, this heat exchange mechanism has two drawbacks. On the one hand, it is difficult for manufacturers to accurately control the temperature of the heat carrier after heat exchange. On the other hand, due to the temperature difference between the flue gas duct and the sleeve, the different deformation amounts can cause deformation and cracking at the connection, thus affecting the sealing effect and service life.

[0004] The second type of heat exchange mechanism involves winding the heat exchange tube around the outside of the flue gas duct, and then wrapping both the duct and the insulation layer together on the outside. The advantage of this mechanism is that the heat exchange tube is an independent structure, separated from the flue gas duct, ensuring good sealing performance and preventing damage from deformation of the flue gas duct. Manufacturers can also adjust the winding length of the heat exchange tube according to heat exchange requirements, thereby achieving accurate temperature control of the heat carrier. However, its disadvantages are twofold: firstly, winding the heat exchange tube significantly increases the manufacturing difficulty; secondly, the dual obstruction of the flue gas duct and the heat exchange tube results in relatively low heat exchange efficiency, requiring a longer heat exchange time for the heat carrier to achieve its heat exchange effect, thus failing to achieve efficient utilization of the heat energy in the high-temperature flue gas.

[0005] Therefore, existing heat exchange mechanisms based on high-temperature flue gas in flue gas ducts suffer from poor operational stability and low heat exchange efficiency. Utility Model Content

[0006] The purpose of this invention is to provide a boiler high-temperature flue with waste heat recovery function. It features good operational stability, high heat exchange efficiency, and is easy for manufacturers to process.

[0007] The technical solution of this utility model is as follows: A high-temperature flue of a boiler with waste heat recovery function includes a flue pipe and a sleeve arranged in an inner and outer nested manner. Several first and second partitions are distributed in a ring around the flue pipe. The first and second partitions are arranged alternately. Openings are provided at the top and bottom of the first and second partitions. Several connecting parts that fit the first or second partitions are distributed in a ring on the inner side of the sleeve. An S-shaped heat exchange channel is formed between the sleeve and the flue pipe through the first partition, the second partition and the connecting parts. Heat exchange inlet pipe and heat exchange outlet pipe connected to the sleeve are respectively provided at both ends of the heat exchange channel.

[0008] In the aforementioned high-temperature flue of a boiler with waste heat recovery function, the first and second partitions are provided with flue pipe flanges that are fixedly connected to the flue pipes at both ends. The two ends of the connection are connected with sleeve flanges. The sleeve flanges and the flue pipe flanges are connected to each other by fixing bolts. The inner side of the fixing bolts is provided with sealing plates, and the two sides of the sealing plates are respectively in contact with the sleeve flanges and the flue pipe flanges.

[0009] In the aforementioned high-temperature flue of a boiler with waste heat recovery function, the sleeve flange is connected to fixing bolts around its perimeter via elongated holes.

[0010] In the aforementioned high-temperature flue of a boiler with waste heat recovery function, the end of the flue forms an installation surface, which is flush with the outer wall of the flue flange.

[0011] In the aforementioned boiler high-temperature flue with waste heat recovery function, the connecting part is a long strip plate, one side wall of the long strip plate is attached to the side wall of the first partition or the second partition, and the long strip plate partially overlaps the first partition or the second partition in the radial direction.

[0012] In the aforementioned high-temperature flue of a boiler with waste heat recovery function, the connecting part consists of two long strips spaced apart, with a slot formed between the two long strips for inserting the first partition and the second partition.

[0013] Compared with the prior art, this utility model has the following characteristics:

[0014] (1) Through the structural cooperation of the first partition, the second partition and the connecting part, the present invention can form an S-shaped heat exchange channel between the flue and the sleeve. The manufacturer can then control the heat exchange temperature of the heat carrier by adjusting the length of the heat exchange channel, and improve the contact area and heat exchange efficiency between the heat carrier and the flue. At the same time, the first partition can also act as a heat exchange plate to exchange heat with the heat carrier in the heat exchange channel after being arranged, thereby improving the heating efficiency of the heat carrier. By setting the first partition, the second partition and the connecting part separately and fitting them together, when the first partition and the second partition are deformed differently from the connecting part due to the temperature difference, the deformation at the connection will not be caused, thereby improving the working stability of the present invention.

[0015] (2) By setting the connection structure between the smoke pipe and the sleeve, on the one hand, the sealing effect of the inner heat exchange channel can be achieved, ensuring the flow and heat exchange stability of the heat carrier; on the other hand, a gap can be left for the relative movement of the sleeve flange and the smoke pipe flange, thereby preventing damage caused by the deformation difference at the connection between the two and further improving its working stability.

[0016] (3) By adopting a plate structure and arranging the first partition, the second partition and the connecting part in parallel along the circumference of the flue, they can be directly fixed to the flue or sleeve by welding after cutting, which eliminates the complicated process of bending pipes and effectively reduces the processing difficulty for manufacturers; on this basis, the present invention can also assemble the various components into an integrated structure and directly weld or flange connect them to the external pipe, thereby facilitating the user's installation and subsequent disassembly of the present invention.

[0017] Therefore, this utility model has the characteristics of good working stability and high heat exchange efficiency, and is convenient for manufacturers to process. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of Example 1;

[0019] Figure 2 This is a distribution diagram of the first and second partitions in Example 1;

[0020] Figure 3 This is a structural schematic diagram of Example 2;

[0021] Figure 4 This is a distribution diagram of the first partition, the second partition, and the third partition in Example 2.

[0022] The labels in the attached diagram are: 1-smoke pipe, 2-sleeve, 3-connection, 4-heat exchange inlet pipe, 5-heat exchange outlet pipe, 6-smoke pipe flange, 7-sleeve flange, 101-first partition, 102-second partition, 103-third partition. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0024] Example 1. A high-temperature flue of a boiler with waste heat recovery function is configured as follows: Figure 1-2 As shown, the device includes a flue pipe 1 and a sleeve 2 arranged in a nested configuration. The sleeve 2 is wrapped with an insulation layer. Several first partitions 101 and second partitions 102 are arranged in a ring around the flue pipe 1. The first partitions 101 and second partitions 102 are arranged alternately in the circumferential direction. The top of the first partition 101 and the bottom of the second partition 102 are provided with openings. The sleeve 2 is located radially outside the first partitions 101 and second partitions 102. Several connecting parts 3 that fit the first partitions 101 or second partitions 102 are arranged in a ring on the inner side of the sleeve 2. An S-shaped heat exchange channel is formed between the sleeve 2 and the flue pipe 1 through the first partitions 101, second partitions 102 and connecting parts 3. The two ends of the heat exchange channel are respectively provided with heat exchange inlet pipe 4 and heat exchange outlet pipe 5 connecting the sleeve 2.

[0025] The first partition 101 and the second partition 102 are provided with flue flanges 6 for fixed connection of flue pipe 1 at both ends. The two ends of the connecting part 3 are connected with sleeve flanges 7. The sleeve flanges 7 are located on the radial outer side of the first partition 101 and the second partition 102. The sleeve flanges 7 and the flue flanges 6 are connected to each other by fixing bolts. The inner side of the fixing bolts is provided with sealing plates 8. The two sides of the sealing plates 8 are respectively in contact with the sleeve flanges 7 and the flue flanges 6.

[0026] The first partition 101 and the second partition 102 are in contact with each other at the end away from the opening and the flue flange 6.

[0027] The sleeve flange 7 is connected to the fixing bolts around its perimeter via elongated holes.

[0028] The connecting part 3 is a long strip plate. One side wall of the long strip plate is in contact with the side wall of the first partition 101 or the second partition 102. The long strip plate partially overlaps the first partition 101 or the second partition 102 in the radial direction.

[0029] In this embodiment, during installation, the operator first welds the first partition 101, the second partition 102, and the upper flue flange 6 to the outer wall of the flue 1. Then, the connecting part 3, the sleeve 2, and the sleeve flange 7 are welded together to form an integrated structure. This integrated structure is then inserted into the first partition 101 and the second partition 102, and connected to the upper flue flange 6 via the sleeve flange 7. After the integrated structure is installed, the lower flue flange 6 is bolted to the sleeve flange 7. Finally, the lower flue flange 6 is welded to the outer wall of the flue, thereby sealing the inner cavity of the sleeve 2 with the flue flanges 6 at both ends to prevent the heat carrier from overflowing.

[0030] After the high-temperature flue is assembled, the operators can directly weld both ends of the flue pipe 1 to the boiler's flue pipe, and allow the high-temperature flue gas to exchange heat with the heat carrier in the heat exchange channel through the flue pipe 1, the first baffle 101 and the second baffle 102 during the flow process, thereby realizing the function of residual heat recovery.

[0031] Example 2. A boiler high-temperature flue with waste heat recovery function is configured as follows: Figure 3-4 As shown, the device includes a flue pipe 1 and a sleeve 2 arranged in a nested configuration. The sleeve 2 is wrapped with an insulation layer. Several first partitions 101 and second partitions 102 are arranged in a ring around the flue pipe 1. The first partitions 101 and second partitions 102 are arranged alternately in the circumferential direction. The top of the first partition 101 and the bottom of the second partition 102 are provided with openings. The sleeve 2 is located radially outside the first partitions 101 and second partitions 102. Several connecting parts 3 that fit the first partitions 101 or second partitions 102 are arranged in a ring on the inner side of the sleeve 2. An S-shaped heat exchange channel is formed between the sleeve 2 and the flue pipe 1 through the first partitions 101, second partitions 102 and connecting parts 3. The two ends of the heat exchange channel are respectively provided with heat exchange inlet pipe 4 and heat exchange outlet pipe 5 connecting the sleeve 2.

[0032] The first partition 101 and the second partition 102 are provided with flue flanges 6 for fixed connection of flue pipe 1 at both ends. The two ends of the connecting part 3 are connected with sleeve flanges 7. The sleeve flanges 7 are located on the radial outer side of the first partition 101 and the second partition 102. The sleeve flanges 7 and the flue flanges 6 are connected to each other by fixing bolts. The inner side of the fixing bolts is provided with sealing plates 8. The two sides of the sealing plates 8 are respectively in contact with the sleeve flanges 7 and the flue flanges 6.

[0033] The sleeve flange 7 is connected to the fixing bolts around its perimeter via elongated holes.

[0034] The end of the flue pipe 1 forms a mounting surface, which is flush with or fits against the flue pipe flange 6.

[0035] The connecting part 3 consists of two long strips spaced apart, with a slot formed between the two long strips for inserting the first partition 101 and the second partition 102. After the first partition 101 and the second partition 102 are inserted into the slot, there is a gap between them and the inner wall of the slot.

[0036] It also includes a third partition 103 arranged in a ring around the outside of the flue pipe 1. The third partition 103 is offset from the first partition 101 and the second partition 102 in the circumferential direction. The upper and lower ends of the third partition 103 are connected to the flue pipe flange 6. The outer side of the third partition 103 is connected to the sleeve 2 through the connecting part 3 to form a seal. A separate heat exchange channel is formed between adjacent third partitions 103.

[0037] Compared to Example 1, this example assembles the high-temperature flue into a modular structure, allowing it to be flanged and connected to the boiler's flue gas outlet pipe, facilitating installation and subsequent replacement by the manufacturer. By defining the structure of the connecting part 3, the first partition 101 and the second partition 102 can be fastened together, thereby improving the sealing performance of the two after connection and ensuring the flow stability of the heat carrier in the heat exchange channel.

[0038] By setting the third baffle, designers can adjust the length and number of heat exchange channels according to heat exchange requirements. This allows the embodiment to achieve multi-station synchronous heat exchange of the heat carrier, thereby improving the utilization of thermal energy of high-temperature flue gas while ensuring its heat exchange effect.

Claims

1. A high-temperature flue of a boiler with waste heat recovery function, characterized in that: The utility model provides a heat exchange pipe, which comprises a smoke pipe (1) and a sleeve pipe (2) arranged in an inner-outer nested mode, a plurality of first baffles (101) and second baffles (102) are annularly distributed around the smoke pipe (1), the first baffles (101) and the second baffles (102) are arranged alternately, and the top of the first baffle (101) and the bottom of the second baffle (102) are provided with openings; a plurality of connecting portions (3) are annularly distributed on the inner side of the sleeve pipe (2) and are attached to the first baffles (101) or the second baffles (102), an S-shaped heat exchange channel is formed between the sleeve pipe (2) and the smoke pipe (1) through the first baffles (101), the second baffles (102) and the connecting portions (3), and heat exchange inlet pipes (4) and heat exchange outlet pipes (5) connected to the sleeve pipe (2) are arranged at both ends of the heat exchange channel.

2. The boiler high-temperature flue with waste heat recovery function according to claim 1, characterized in that: The first baffles (101) and the second baffles (102) are provided with smoke pipe flanges (6) fixedly connected to the smoke pipe (1) at both ends, the connecting portions (3) are connected to sleeve pipe flanges (7) at both ends, the sleeve pipe flanges (7) and the smoke pipe flanges (6) are connected to each other through fixed bolts, the inner side of the fixed bolts is provided with sealing sheets (8), and the two sides of the sealing sheets (8) are attached to the sleeve pipe flanges (7) and the smoke pipe flanges (6) respectively.

3. The boiler high-temperature flue with waste heat recovery function according to claim 2, characterized in that: The sleeve pipe flanges (7) are connected to the fixed bolts through long holes around the sleeve pipe flanges (7).

4. The boiler high-temperature flue with waste heat recovery function according to claim 2, characterized in that: The end of the smoke pipe (1) forms a mounting surface, and the mounting surface is flush with the outer wall of the smoke pipe flange (6).

5. The boiler high-temperature flue having a waste heat recovery function according to claim 1, characterized by: The connecting portion (3) is a long strip plate, one side wall of the long strip plate is attached to the side wall of the first baffle (101) or the second baffle (102), and the long strip plate partially overlaps the first baffle (101) or the second baffle (102) along the radial direction.

6. The boiler high-temperature flue having a waste heat recovery function according to claim 1, characterized by: The connecting portion (3) is two long strip plates arranged at intervals, and the two long strip plates form a slot for inserting the first baffle (101) and the second baffle (102).

Images