Burning tail gas waste heat utilization device

Abstract

The utility model discloses a sintering tail gas waste heat utilization device, which belongs to the technical field of waste heat utilization and comprises a heat exchange box, support legs are symmetrically and fixedly connected to four corners of the bottom of the heat exchange box, and a box cover is mounted at an opening in the top of the heat exchange box; according to the device, sintering tail gas enters the heat exchange box through the first tail gas pipe and then is exhausted from the second tail gas pipe after passing through the heat exchange pipe, meanwhile, fresh air passes through the interior of the heat exchange box through the first fresh air pipe and the second fresh air pipe, heat exchange is conducted on the tail gas and the fresh air through the heat exchange pipe, and the fresh air is heated through the tail gas; and when the tail gas flows in the heat exchange pipe, the fan blades are driven to rotate, the fan blades drive the scraping plate to rotate through the rotating shaft, smoke dust attached to the inner wall of the heat exchange pipe is cleaned through the scraping plate, and the situation that the smoke dust is attached to the inner wall of the heat exchange pipe, and consequently the heat exchange efficiency of the heat exchange pipe is reduced is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat utilization, in particular to a device for utilizing waste heat from sintering tail gas. Background Art

[0002] The sintering machine is suitable for the sintering operation of large-scale ferrous metallurgical sintering plants, and is mainly suitable for the sintering treatment of iron ore powder in large and medium-sized sintering plants. It can sinter concentrate powder and rich ore powder of different compositions and different particle sizes into blocks, and partially eliminate harmful impurities such as sulfur and phosphorus contained in the ore. When the sintering machine is in use, high-temperature exhaust gas will be generated, and the exhaust gas waste heat utilization device is required to recycle the exhaust gas waste heat.

[0003] The current sintering tail gas waste heat utilization device, for example, a sintering machine waste heat recovery device proposed in Publication No.: CN219797975U, realizes efficient heat exchange between the tail gas pipe row and the fresh air pipe row through the application of heat exchange cylinders. The heat of the sintering machine tail gas is transferred to the fresh air. After the fresh air is heated, it is used to heat the material before entering the sintering machine. After the material is heated, it enters the sintering machine, which is beneficial to saving sintering machine fuel. Compared with the prior art, the heat exchange efficiency between the sintering machine tail gas and the fresh air in this application is high, which is more conducive to the full recovery of the heat energy of the sintering machine tail gas.

[0004] The existing sintering tail gas waste heat utilization device can recycle the tail gas waste heat when in use, but it is found during use that when the tail gas and fresh air are exchanged with heat through the heat exchange tube, since the tail gas contains a large amount of smoke and dust, the smoke and dust will adhere to the inner wall of the heat exchange tube when flowing in the heat exchange tube. As the device is used, the heat exchange efficiency of the heat exchange tube gradually decreases, and it needs to be disassembled and cleaned regularly, which is inconvenient to use. Therefore, we propose a sintering tail gas waste heat utilization device to solve the problem raised. Utility Model Content

[0005] The utility model aims to provide a device for utilizing the waste heat of sintering tail gas, so that when the tail gas flows in the heat exchange tube, the fan blades are driven to rotate, and the fan blades drive the scraper to rotate through the rotating shaft, and the scraper is used to clean the smoke and dust attached to the inner wall of the heat exchange tube, so as to prevent the smoke and dust from adhering to the inner wall of the heat exchange tube and reducing the heat exchange efficiency of the heat exchange tube.

[0006] To achieve the above purpose, the utility model provides the following technical solution: a sintering tail gas waste heat utilization device, comprising a heat exchange box, the bottom four corners of the heat exchange box are symmetrically fixed with legs, the top opening of the heat exchange box is installed with a box cover, wherein:

[0007] The middle of the box cover is connected to the first tail gas pipe, the middle of the bottom end of the heat exchange box is connected to the second tail gas pipe, the box cover is detachably connected to the top of the heat exchange box through a quick disassembly mechanism, end plates are symmetrically installed at the upper and lower ends of the heat exchange box, heat exchange pipes are connected between the end plates, and the first fresh air pipe and the second fresh air pipe are respectively connected to the two sides of the heat exchange box;

[0008] The first fresh air duct, the second fresh air duct and the heat exchange box between the end plates are connected, and brackets are symmetrically fixedly connected inside the upper and lower ends of the heat exchange tube. A rotating shaft is rotatably connected between the brackets. Fan blades are installed at the bottom end of the rotating shaft, and scrapers are symmetrically installed on both sides of the rotating shaft.

[0009] Preferably, the quick disassembly and assembly mechanism includes a first mounting bracket, the top of the heat exchange box is fixedly connected to the first mounting bracket, the box cover is fixedly connected to the bottom of the first mounting bracket corresponding to the first mounting bracket, the first mounting bracket is symmetrically penetrated with mounting grooves, the second mounting bracket is fixedly connected to the bottom of the mounting groove corresponding to the mounting rod, the mounting rod is symmetrically provided with block grooves on both sides near the bottom, a spring is installed in the block groove, a block is installed on the open side of the spring near the block groove, and the first mounting bracket and the second mounting bracket are sealed by a sealing ring.

[0010] Preferably, the distance between the second mounting frame and the clamping block matches the thickness of the first mounting frame.

[0011] Preferably, the lower side of the clamping block away from the spring is a curved surface, and the clamping block is elastically connected to the mounting rod via the spring.

[0012] Preferably, the end plate is fixedly connected to the heat exchange tube as a whole, and the end plate is fixedly connected to the heat exchange box by bolts.

[0013] Preferably, the vertical distance from the central axis of the rotating shaft to the end of the scraper coincides with the inner radius of the heat exchange tube.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0015] 1. In the utility model, the sintering tail gas enters the heat exchange box through the first tail gas pipe, and then is discharged from the second tail gas pipe after passing through the heat exchange pipe. At the same time, the fresh air passes through the first fresh air pipe and the second fresh air pipe and passes through the inside of the heat exchange box. The tail gas and the fresh air are exchanged with heat through the heat exchange pipe, so that the tail gas heats the fresh air. Then, the sintering machine raw materials are heated by the fresh air, and then the waste heat of the tail gas is utilized. When the tail gas flows in the heat exchange pipe, the fan blades are driven to rotate, and the fan blades drive the scraper to rotate through the rotating shaft. The scraper cleans the smoke attached to the inner wall of the heat exchange pipe to prevent the smoke from adhering to the inner wall of the heat exchange pipe, which reduces the heat exchange efficiency of the heat exchange pipe.

[0016] 2. According to the utility model, when it is necessary to remove the box cover, the blocks on both sides of the installation rod are squeezed at the same time to shrink the blocks into the block grooves, so that the installation rod can be moved out of the installation grooves, and the box cover can be removed. When installing the box cover, the box cover drives the installation rod to insert into the installation groove. When the curved surface of the block presses against the inner wall of the installation groove, the block is forced to overcome the elastic force of the spring and shrink into the block groove. When the block completely penetrates the installation groove, the spring pushes the block out to press against the bottom of the first installation frame, thereby completing the installation of the box cover. The quick disassembly and assembly mechanism is provided to facilitate the quick disassembly and assembly of the box cover, thereby facilitating the disassembly and assembly of the heat exchange tubes in the heat exchange box. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure of the heat exchange tube of the utility model;

[0019] Figure 3 For this utility model Figure 1 A schematic diagram of the partially enlarged structure at center A;

[0020] Figure 4 For this utility model Figure 1 Schematic diagram of the local enlarged structure at point B in the middle.

[0021] In the figure: 1. heat exchange box; 2. support leg; 3. box cover; 4. first exhaust pipe; 5. second exhaust pipe; 6. first mounting bracket; 7. second mounting bracket; 8. mounting slot; 9. mounting rod; 10. block slot; 11. spring; 12. block; 13. sealing ring; 14. end plate; 15. heat exchange tube; 16. first fresh air duct; 17. second fresh air duct; 18. bracket; 19. rotating shaft; 20. fan blade; 21. scraper. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Example:

[0024] See also Figures 1 to 4 The utility model provides a technical solution: a sintering tail gas waste heat utilization device, comprising a heat exchange box 1, the bottom four corners of the heat exchange box 1 are symmetrically fixedly connected with legs 2, and the top opening of the heat exchange box 1 is equipped with a box cover 3, wherein,

[0025] The middle of the box cover 3 is connected to the first tail gas pipe 4, the middle of the bottom end of the heat exchange box 1 is connected to the second tail gas pipe 5, the box cover 3 is detachably connected to the top of the heat exchange box 1 through a quick disassembly mechanism, the upper and lower ends of the heat exchange box 1 are symmetrically installed with end plates 14, the end plates 14 are connected to the heat exchange pipe 15, and the two sides of the heat exchange box 1 are respectively connected to the first fresh air pipe 16 and the second fresh air pipe 17;

[0026] The first fresh air pipe 16 and the second fresh air pipe 17 are connected to the heat exchange box 1 between the end plates 14. Brackets 18 are symmetrically fixedly connected inside the upper and lower ends of the heat exchange pipe 15. A rotating shaft 19 is rotatably connected between the brackets 18. A fan blade 20 is installed at the bottom end of the rotating shaft 19. Scrapers 21 are symmetrically installed on both sides of the rotating shaft 19.

[0027] The sintering tail gas enters the heat exchange box 1 through the first tail gas pipe 4, and then passes through the heat exchange tube 15 and is discharged from the second tail gas pipe 5. At the same time, the fresh air passes through the first fresh air pipe 16 and the second fresh air pipe 17 through the inside of the heat exchange box 1. The tail gas and the fresh air are exchanged with each other through the heat exchange tube 15, so that the tail gas heats the fresh air. Then, the sintering machine raw materials are heated by the fresh air, and the waste heat of the tail gas is utilized. When the tail gas flows in the heat exchange tube 15, the fan blade 20 is driven to rotate. The fan blade 20 drives the scraper 21 to rotate through the rotating shaft 19. The scraper 21 cleans the smoke attached to the inner wall of the heat exchange tube 15 to prevent the smoke from adhering to the inner wall of the heat exchange tube 15, which reduces the heat exchange efficiency of the heat exchange tube 15.

[0028] See also Figures 1 to 4The quick disassembly and assembly mechanism includes a first mounting frame 6, the top of the heat exchange box 1 is fixedly connected with the first mounting frame 6, the box cover 3 is fixedly connected with a second mounting frame 7 at the bottom corresponding to the first mounting frame 6, the first mounting frame 6 is symmetrically penetrated with a mounting groove 8, the second mounting frame 7 is fixedly connected with a mounting rod 9 at the bottom corresponding to the mounting groove 8, the mounting rod 9 is symmetrically provided with a block groove 10 on both sides near the bottom, a spring 11 is installed in the block groove 10, and a block 12 is installed on the opening side of the spring 11 near the block groove 10, the first mounting frame 6 and the second mounting frame 7 are sealed by a sealing ring 13, the distance between the second mounting frame 7 and the block 12 is consistent with the thickness of the first mounting frame 6, the block 12 is away from the spring 11 The lower side is a curved surface, and the block 1 2 is elastically connected with the mounting rod 9 through the spring 11. When the box cover 3 needs to be removed, the clamping blocks 12 on both sides of the mounting rod 9 are squeezed at the same time to make the clamping blocks 12 retract into the clamping block grooves 10, so that the mounting rod 9 can be moved out of the mounting grooves 8, and then the box cover 3 is removed. When installing the box cover 3, the box cover 3 drives the mounting rod 9 to insert into the mounting groove 8. When the curved surface of the clamping block 12 abuts against the inner wall of the mounting groove 8, the clamping block 12 is forced to overcome the elastic force of the spring 11 and retract into the clamping block groove 10. When the clamping block 12 completely penetrates the mounting groove 8, the spring 11 pushes the clamping block 12 out to abut against the bottom of the first mounting frame 6, and then the installation of the box cover 3 is completed. The quick disassembly and assembly mechanism is provided to facilitate the quick disassembly and assembly of the box cover 3, and then the heat exchange tube 15 in the heat exchange box 1 is conveniently disassembled and assembled.

[0029] See also Figures 1 to 4 The end plate 14 is integrally fixedly connected to the heat exchange tube 15 , and the end plate 14 is fixedly connected to the heat exchange box 1 by bolts. The vertical distance from the central axis of the rotating shaft 19 to the end of the scraper 21 coincides with the inner radius of the heat exchange tube 15 .

[0030] Working principle: This is a device for utilizing the waste heat of sintering tail gas. The sintering tail gas enters the heat exchange box 1 through the first tail gas pipe 4, and then passes through the heat exchange tube 15 and is discharged from the second tail gas pipe 5. At the same time, the fresh air passes through the first fresh air pipe 16 and the second fresh air pipe 17 through the inside of the heat exchange box 1. The heat exchange tube 15 exchanges heat between the tail gas and the fresh air, so that the tail gas heats the fresh air. Then, the sintering machine raw materials are heated by the fresh air, and then the waste heat of the tail gas is utilized. When the tail gas flows in the heat exchange tube 15, the fan blade 20 is driven to rotate. The fan blade 20 drives the scraper 21 to rotate through the rotating shaft 19. The scraper 21 cleans the smoke attached to the inner wall of the heat exchange tube 15 to prevent the smoke from adhering to the inner wall of the heat exchange tube 15, so that the heat exchange tube 15 can be used. When the heat exchange efficiency of the heat pipe 15 decreases and the box cover 3 needs to be removed, the blocks 12 on both sides of the installation rod 9 are squeezed at the same time to retract the blocks 12 into the block grooves 10, so that the installation rod 9 can be moved out of the installation groove 8, and the box cover 3 is removed. When installing the box cover 3, the box cover 3 drives the installation rod 9 to insert into the installation groove 8. When the curved surface of the block 12 abuts against the inner wall of the installation groove 8, the block 12 is forced to overcome the elastic force of the spring 11 and retract into the block groove 10. When the block 12 completely penetrates the installation groove 8, the spring 11 pushes the block 12 out to abut against the bottom of the first mounting frame 6, thereby completing the installation of the box cover 3. The quick disassembly and assembly mechanism is set to facilitate the quick disassembly and assembly of the box cover 3, thereby facilitating the disassembly and assembly of the heat exchange pipe 15 in the heat exchange box 1.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for utilizing waste heat from sintering tail gas, comprising a heat exchange box (1), characterized in that: The four corners of the bottom of the heat exchange box (1) are symmetrically fixedly connected with supporting legs (2), and the top opening of the heat exchange box (1) is equipped with a box cover (3), wherein: The middle of the box cover (3) is connected to a first tail gas pipe (4), the middle of the bottom end of the heat exchange box (1) is connected to a second tail gas pipe (5), the box cover (3) is detachably connected to the top of the heat exchange box (1) through a quick disassembly mechanism, end plates (14) are symmetrically installed at the upper and lower ends of the heat exchange box (1), heat exchange pipes (15) are connected between the end plates (14), and the two sides of the heat exchange box (1) are respectively connected to a first fresh air pipe (16) and a second fresh air pipe (17); The first fresh air duct (16), the second fresh air duct (17) and the heat exchange box (1) between the end plates (14) are connected, and brackets (18) are symmetrically fixedly connected inside the upper and lower ends of the heat exchange tube (15), and a rotating shaft (19) is rotatably connected between the brackets (18), and a fan blade (20) is installed at the bottom end of the rotating shaft (19), and scrapers (21) are symmetrically installed on both sides of the rotating shaft (19).

2. The sintering tail gas waste heat utilization device according to claim 1, characterized in that: The quick disassembly and assembly mechanism comprises a first mounting frame (6), the top of the heat exchange box (1) is fixedly connected to the first mounting frame (6), the box cover (3) is fixedly connected to the bottom of the first mounting frame (6), the first mounting frame (6) is symmetrically penetrated by mounting grooves (8), the second mounting frame (7) is fixedly connected to the bottom of the mounting groove (8) by a mounting rod (9), the mounting rod (9) is symmetrically provided with block grooves (10) on both sides near the bottom, a spring (11) is installed in the block groove (10), and a block (12) is installed on the opening side of the spring (11) near the block groove (10), and the first mounting frame (6) and the second mounting frame (7) are sealed by a sealing ring (13).

3. The sintering tail gas waste heat utilization device according to claim 2 is characterized in that: The distance between the second mounting frame (7) and the clamping block (12) matches the thickness of the first mounting frame (6).

4. The sintering tail gas waste heat utilization device according to claim 2, characterized in that: The lower part of the clamping block (12) away from the spring (11) is a curved surface, and the clamping block (12) is elastically connected to the mounting rod (9) via the spring (11).

5. The device for utilizing waste heat from sintering tail gas according to claim 1, characterized in that: The end plate (14) and the heat exchange tube (15) are integrally fixedly connected, and the end plate (14) is fixedly connected to the heat exchange box (1) via bolts.

6. The device for utilizing waste heat from sintering tail gas according to claim 1, characterized in that: The vertical distance from the central axis of the rotating shaft (19) to the end of the scraper (21) coincides with the inner radius of the heat exchange tube (15).

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