Flue gas sealing device in waste heat boiler

Abstract

The invention discloses an in-furnace flue gas sealing device for a waste heat boiler, and relates to the technical field of waste heat boilers, the in-furnace flue gas sealing device comprises a flue main body, an upper barrier plate and a lower barrier plate, the upper end of the flue main body is provided with a flue inlet, the lower end of the flue main body is provided with a first flue outlet, one side of the flue main body is provided with a second flue outlet, and the second flue outlet is provided with a second flue outlet. Auxiliary seats are symmetrically mounted in the flue main body, supporting plates are symmetrically mounted at the upper end of the flue main body, a lower baffle is movably mounted on the inner wall of the flue main body, and limiting columns are symmetrically mounted on the inner wall of the flue main body. The upper baffle and the lower baffle are arranged, the auxiliary base supports the other end of the upper baffle in an auxiliary mode, the lower baffle is movably connected with the interior of the flue body, the stability of the upper baffle and the lower baffle is improved, the upper baffle and the lower baffle are matched, high-temperature flue gas loss is reduced, the heat transfer efficiency of the heating surface is reduced, and the heat transfer efficiency is improved. And meanwhile, the operation safety of the upper barrier plate and the lower barrier plate in the waste heat boiler is improved.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat boilers, and in particular to a flue gas sealing device in a waste heat boiler furnace. Background Art

[0002] In the context of today's energy industry, improving the economic efficiency of power plants is of great significance to promoting sustainable development. Waste heat boilers, as core equipment for improving energy utilization efficiency, play a key role in reducing operating costs and improving energy conversion efficiency through design optimization.

[0003] By carefully optimizing the heating surface layout of the waste heat boiler, it is not only possible to ensure that the boiler parameters are optimized under various operating conditions, but also to significantly improve the energy efficiency. This is an important way to achieve resource conservation and environmentally friendly development.

[0004] In the prior art, at the flue inlet of the waste heat boiler, due to the high temperature, fast flow rate and local turbulence of the flue gas, the flue gas baffle plate arranged on the outer side of the heating surface module is affected by the high temperature and high pressure of the flue gas, especially the side facing the flue gas direction is very easy to vibrate, causing cracks in the weld between the flue gas baffle plate and the connecting plate, resulting in the fall of the flue gas baffle plate, thereby causing the loss of high-temperature flue gas and the decrease in the heat transfer efficiency of the heating surface. At the same time, the fallen flue gas baffle plate will also bring serious safety hazards to the operation of the waste heat boiler. Summary of the invention

[0005] Based on this, the object of the present invention is to provide a flue gas sealing device in a waste heat boiler furnace to solve the technical problems in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a flue gas sealing device in a waste heat boiler furnace, comprising a flue main body, an upper baffle plate and a lower baffle plate, wherein the upper baffle plate and the lower baffle plate are movably installed inside the flue main body, and the upper baffle plate and the lower baffle plate are movably connected;

[0007] A flue inlet is provided at the upper end of the flue main body, a first flue outlet is provided at the lower end of the flue main body, a second flue outlet is provided at one side of the flue main body, an auxiliary seat is symmetrically installed inside the flue main body, a support plate is symmetrically installed at the upper end of the flue main body, and the inner walls of the two groups of support plates are movably connected to the outer walls of the two groups of auxiliary seats respectively, a lower baffle plate is movably installed on the inner wall of the flue main body, and limiting columns are symmetrically installed on the inner wall of the flue main body, the outer wall of the lower end of the upper baffle plate and the outer wall of the lower end of the lower baffle plate are symmetrically opened with a first reserved groove and a second reserved groove respectively, and the inner walls of the two groups of first reserved grooves and the inner walls of the two groups of second reserved grooves are movably connected to the outer walls of the two groups of limiting columns respectively;

[0008] A magnetic block is installed inside the lower end of the upper blocking plate, and a magnetic block is installed inside the upper end of the lower blocking plate, and the magnetic block inside the lower blocking plate is attracted to the magnetic block inside the upper blocking plate.

[0009] By adopting the above technical scheme, the upper baffle plate is movably connected to one end of the lower baffle plate, the internal magnetic block at one end of the upper baffle plate is attracted to the internal magnetic block at one end of the lower baffle plate, the other end of the upper baffle plate is movably connected to the auxiliary seat, the auxiliary seat provides auxiliary support for the other end of the upper baffle plate, and the lower baffle plate is movably connected to the inside of the flue body, thereby improving the stability of the upper baffle plate and the lower baffle plate, and the upper baffle plate cooperates with the lower baffle plate to reduce the loss of high-temperature flue gas and the decrease in heat transfer efficiency of the heating surface, while improving the safety of the upper baffle plate and the lower baffle plate in the operation of the waste heat boiler.

[0010] The present invention is further configured such that a driving motor is installed on the outer wall of one side of the flue main body, a driving shaft is symmetrically installed inside the flue main body, and a group of driving shafts extends to one end of the outer wall of the flue main body and is connected to the output end of the driving motor, the two groups of driving shafts are connected by a synchronous belt, the outer walls of the two groups of driving shafts are provided with reciprocating thread grooves, and the outer walls of the two groups of driving shafts are threadedly connected to the inner wall of the lower baffle plate.

[0011] As a preferred embodiment, the drive motor is started to drive a set of drive shafts to rotate, and the two sets of drive shafts are connected by a synchronous belt, so the two sets of drive shafts rotate synchronously, and the outer walls of the two sets of drive shafts are threadedly connected to the inner wall of the lower baffle plate, so the lower baffle plate is displaced.

[0012] The present invention is further configured such that two groups of connecting shafts are symmetrically installed inside the flue main body, and the two groups of connecting shafts are connected by a synchronous belt, one end of one group of connecting shafts is provided with a one-way bearing, and one group of connecting shafts is connected to a group of driving shafts by a synchronous belt.

[0013] Preferably, one group of drive shafts rotates, one group of drive shafts is connected to one group of linkage shafts via a synchronous belt, so one group of linkage shafts rotates, and two groups of linkage shafts are connected via a synchronous belt, so the two groups of linkage shafts rotate synchronously.

[0014] The present invention is further configured such that limit blocks are symmetrically installed on the upper end of the upper blocking plate, and the outer walls of the two groups of limit blocks are respectively movably connected to the inner walls of the two groups of auxiliary seats, the outer walls of the two groups of connecting shafts are both provided with reciprocating thread grooves, and the outer walls of the two groups of connecting shafts are respectively threadedly connected to the inner walls of the two groups of limit blocks.

[0015] Preferably, the two groups of linkage shafts rotate synchronously, and the outer walls of the two groups of linkage shafts are respectively threadedly connected to the inner walls of the two groups of limit blocks, so that the two groups of limit blocks are displaced, thereby driving the upper blocking plate to be displaced.

[0016] The present invention is further configured such that the central end of the upper blocking plate is inclined, and a protrusion is provided on an outer wall on one side of the central end of the upper blocking plate.

[0017] Preferably, one end of the upper baffle plate is inclined to guide the furnace smoke so that it is discharged from the second flue outlet, and a protrusion is provided at one end of the upper baffle plate to protect the connecting end of the upper baffle plate and the lower baffle plate, thereby preventing the furnace smoke from directly impacting the connecting end of the upper baffle plate and the lower baffle plate, and protecting the connecting end of the upper baffle plate and the lower baffle plate.

[0018] The present invention is further configured such that the inner wall of the flue main body is symmetrically provided with sliding grooves, two groups of the inner walls of the sliding grooves are movably installed with connecting rods, and the two groups of connecting rods respectively extend to one end of the outer walls of the two groups of sliding grooves and are movably connected to one end of the lower baffle plate, and one end of the two groups of connecting rods are installed with a limiting tooth plate.

[0019] Preferably, the lower blocking plate moves, pushing the two groups of connecting rods to move, thereby driving the two groups of limiting tooth plates to move.

[0020] The present invention is further configured such that a mounting seat is installed on the inner wall of the flue body, and the outer wall of the upper end of the mounting seat is movably connected to the outer wall of the upper end of the lower baffle plate.

[0021] Preferably, the mounting seat provides auxiliary support to the lower baffle plate.

[0022] The present invention is further configured such that a limit shaft is movably installed on the inner wall of the mounting seat, and the limit shaft extends to the inner wall of the flue body and limit gears are installed on both ends thereof, and two sets of limit gears are respectively meshed and connected with two sets of limit tooth plates.

[0023] Preferably, the two sets of limiting tooth plates are displaced, thereby driving the two sets of limiting gears to rotate, thereby driving the limiting shaft to rotate.

[0024] The present invention is further configured such that a guide plate is installed on the outer wall of the limiting shaft, and one end of the guide plate is arranged in an arc shape.

[0025] As a preferred embodiment, the limiting shaft rotates to drive the guide plate to flip around the limiting shaft as the center.

[0026] In summary, the present invention mainly has the following beneficial effects:

[0027] 1. The present invention is provided with an upper baffle plate and a lower baffle plate, the upper baffle plate is movably connected to one end of the lower baffle plate, the internal magnetic block of one end of the upper baffle plate is attracted to the internal magnetic block of one end of the lower baffle plate, the other end of the upper baffle plate is movably connected to the auxiliary seat, the auxiliary seat provides auxiliary support for the other end of the upper baffle plate, and the lower baffle plate is movably connected to the inside of the flue body, thereby improving the stability of the upper baffle plate and the lower baffle plate, and the upper baffle plate cooperates with the lower baffle plate to reduce the loss of high-temperature flue gas and the decrease in heat transfer efficiency of the heating surface, while improving the safety of the upper baffle plate and the lower baffle plate in the operation of the waste heat boiler.

[0028] 2. The present invention is provided with an upper baffle plate, a lower baffle plate and a guide plate. The upper baffle plate and the lower baffle plate are displaced at the same time, so that the upper baffle plate and the lower baffle plate cooperate to close the first flue outlet and open the second flue outlet. The furnace smoke enters through the flue inlet. One end of the upper baffle plate is tilted to guide the furnace smoke so that the furnace smoke is discharged from the second flue outlet. The lower baffle plate and the guide plate are displaced at the same time, so that the first flue outlet and the second flue outlet are both in an open state. After the furnace smoke enters the interior of the flue main body through the flue inlet, the guide plate guides part of the furnace smoke to the second flue outlet for discharge, and the rest of the furnace smoke is discharged through the first flue outlet, which further improves the utilization efficiency of the high-temperature flue gas of the waste heat boiler and further improves the practicality of the waste heat boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the flue main body in the present invention;

[0030] Figure 2 This is a schematic diagram of the first flue outlet in the present invention in an open state;

[0031] Figure 3 It is a schematic diagram of the first flue outlet and the second flue outlet in the present invention in an open state;

[0032] Figure 4 This is a schematic diagram of the second flue outlet opening state in the present invention;

[0033] Figure 5 It is a schematic diagram of the upper baffle plate in the present invention;

[0034] Figure 6 It is a schematic diagram of the lower baffle plate in the present invention;

[0035] Figure 7 It is a schematic diagram of the mounting base in the present invention;

[0036] Figure 8 It is a schematic diagram of the limiting axis in the present invention.

[0037] Description of reference numerals:

[0038] 1. Flue main body; 2. Flue inlet; 3. First flue outlet; 4. Second flue outlet; 5. Auxiliary seat; 6. Linking shaft; 7. One-way bearing; 8. Upper baffle plate; 9. Limit block; 10. Support plate; 11. First reserved groove; 12. Lower baffle plate; 13. Second reserved groove; 14. Driving motor; 15. Driving shaft; 16. Slide groove; 17. Connecting rod; 18. Limiting tooth plate; 19. Limiting column; 20. Mounting seat; 21. Guide plate; 22. Limiting shaft; 23. Limiting gear. DETAILED DESCRIPTION

[0039] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0040] The following describes an embodiment of the present invention based on its overall structure.

[0041] A flue gas sealing device for a waste heat boiler furnace, please refer to Figure 1 - Figure 8 , including a flue main body 1, an upper baffle plate 8 and a lower baffle plate 12, the upper baffle plate 8 and the lower baffle plate 12 are movably installed inside the flue main body 1, and the upper baffle plate 8 and the lower baffle plate 12 are movably connected;

[0042] A flue inlet 2 is provided at the upper end of the flue main body 1, and a first flue outlet 3 is provided at the lower end of the flue main body 1. Furnace smoke enters the flue main body 1 through the flue inlet 2 and is discharged from the first flue outlet 3. A second flue outlet 4 is provided on one side of the flue main body 1. Auxiliary seats 5 are symmetrically installed inside the flue main body 1. Support plates 10 are symmetrically installed at the upper end of the flue main body 1, and the inner walls of the two groups of support plates 10 are movably connected to the outer walls of the two groups of auxiliary seats 5 respectively. A lower baffle plate 12 is movably installed on the inner wall of the flue main body 1. Limiting columns 19 are symmetrically installed on the inner wall of the flue main body 1. The outer wall of the lower end of the upper baffle plate 8 and the outer wall of the lower end of the lower baffle plate 12 are symmetrically opened with a first reserved groove 11 and a second reserved groove 13 respectively, and the inner walls of the two groups of first reserved grooves 11 and the inner walls of the two groups of second reserved grooves 13 are movably connected to the outer walls of the two groups of limiting columns 19 respectively;

[0043] A magnetic block is installed inside the lower end of the upper baffle plate 8, and a magnetic block is installed inside the upper end of the lower baffle plate 12. The magnetic block inside the lower baffle plate 12 is attracted to the magnetic block inside the upper baffle plate 8. The upper baffle plate 8 is movably connected to one end of the lower baffle plate 12, which improves the stability of the upper baffle plate 8 and the lower baffle plate 12. The upper baffle plate 8 and the lower baffle plate 12 cooperate with each other to reduce the loss of high-temperature flue gas and the decrease in heat transfer efficiency of the heated surface.

[0044] See also Figure 2 - Figure 6A driving motor 14 is installed on the outer wall of one side of the flue body 1, and a driving shaft 15 is symmetrically installed inside the flue body 1, and one group of driving shafts 15 extends to one end of the outer wall of the flue body 1 and is connected to the output end of the driving motor 14, and the two groups of driving shafts 15 are connected by a synchronous belt. The outer walls of the two groups of driving shafts 15 are provided with reciprocating thread grooves, and the outer walls of the two groups of driving shafts 15 are threadedly connected to the inner wall of the lower baffle plate 12. When the driving motor 14 is started, it drives one group of driving shafts 15 to rotate, and the two groups of driving shafts 15 are connected by a synchronous belt, so the two groups of driving shafts 15 rotate synchronously, and the outer walls of the two groups of driving shafts 15 are threadedly connected to the inner wall of the lower baffle plate 12, so the lower baffle plate 12 is displaced.

[0045] See also Figure 2 - Figure 6 Two groups of linkage shafts 6 are symmetrically installed inside the flue main body 1, and the two groups of linkage shafts 6 are connected by a synchronous belt, one end of one group of linkage shafts 6 is provided with a one-way bearing 7, and one group of linkage shafts 6 is connected to a group of drive shafts 15 by a synchronous belt, one group of drive shafts 15 rotates, one group of drive shafts 15 is connected to a group of linkage shafts 6 by a synchronous belt, so one group of linkage shafts 6 rotates, and the two groups of linkage shafts 6 are connected by the synchronous belt, so the two groups of linkage shafts 6 rotate synchronously.

[0046] See also Figure 2 - Figure 5 The upper end of the upper blocking plate 8 is symmetrically installed with a limit block 9, and the outer walls of the two groups of limit blocks 9 are respectively movably connected with the inner walls of the two groups of auxiliary seats 5. The outer walls of the two groups of connecting shafts 6 are provided with reciprocating thread grooves, and the outer walls of the two groups of connecting shafts 6 are respectively threadedly connected with the inner walls of the two groups of limit blocks 9. The two groups of connecting shafts 6 rotate synchronously, and the outer walls of the two groups of connecting shafts 6 are respectively threadedly connected with the inner walls of the two groups of limit blocks 9, so the two groups of limit blocks 9 are displaced, thereby driving the upper blocking plate 8 to displace.

[0047] See also Figure 2 - Figure 5 The center end of the upper baffle plate 8 is tilted, and a protrusion is provided on the outer wall of one side of the center end of the upper baffle plate 8. One end of the upper baffle plate 8 is tilted to guide the furnace smoke so that the furnace smoke is discharged from the second flue outlet 4, and a protrusion is provided at one end of the upper baffle plate 8 to protect the connecting end of the upper baffle plate 8 and the lower baffle plate 12 to prevent the furnace smoke from directly impacting the connecting end of the upper baffle plate 8 and the lower baffle plate 12, thereby protecting the connecting end of the upper baffle plate 8 and the lower baffle plate 12.

[0048] See also Figure 2 - Figure 6The inner wall of the flue body 1 is symmetrically provided with slide grooves 16, and connecting rods 17 are movably installed on the inner walls of the two groups of slide grooves 16, and the two groups of connecting rods 17 extend to one end of the outer wall of the two groups of slide grooves 16 respectively, and are movably connected to one end of the lower baffle plate 12. One end of the two groups of connecting rods 17 is installed with a limiting tooth plate 18. When the lower baffle plate 12 moves, the two groups of connecting rods 17 are pushed to move, thereby driving the two groups of limiting tooth plates 18 to move.

[0049] See also Figure 2 - Figure 7 A mounting seat 20 is installed on the inner wall of the flue main body 1 , and the upper outer wall of the mounting seat 20 is movably connected to the upper outer wall of the lower baffle plate 12 , and the mounting seat 20 provides auxiliary support to the lower baffle plate 12 .

[0050] See also Figure 2 - Figure 8 A limit shaft 22 is movably installed on the inner wall of the mounting seat 20, and the limit shaft 22 extends to the inner wall of the flue body 1. Limit gears 23 are installed on both ends, and the two sets of limit gears 23 are respectively engaged with the two sets of limit tooth plates 18. The two sets of limit tooth plates 18 are displaced, thereby driving the two sets of limit gears 23 to rotate, thereby driving the limit shaft 22 to rotate.

[0051] See also Figure 2 - Figure 8 A guide plate 21 is installed on the outer wall of the limiting shaft 22, and one end of the guide plate 21 is arranged in an arc shape. The limiting shaft 22 rotates, driving the guide plate 21 to flip around the limiting shaft 22 as the center of the circle.

[0052] The working principle of the present invention is as follows: when the furnace smoke enters the interior of the flue body 1 through the flue inlet 2 and is discharged from the first flue outlet 3;

[0053] If the smoke needs to be discharged through the second flue outlet 4, the drive motor 14 is started to drive a set of drive shafts 15 to rotate clockwise. The two sets of drive shafts 15 are connected by a synchronous belt, so the two sets of drive shafts 15 rotate synchronously, and the outer walls of the two sets of drive shafts 15 are threadedly connected to the inner wall of the lower baffle plate 12, so the lower baffle plate 12 is displaced, and the lower baffle plate 12 is displaced in the direction of the upper baffle plate 8;

[0054] When a group of driving shafts 15 rotate, a group of driving shafts 15 is connected with a group of linkage shafts 6 through a synchronous belt, so a group of linkage shafts 6 rotates, and the two groups of linkage shafts 6 are connected through the synchronous belt, so the two groups of linkage shafts 6 rotate synchronously, and the outer walls of the two groups of linkage shafts 6 are respectively threadedly connected with the inner walls of the two groups of limit blocks 9, so the two groups of limit blocks 9 are displaced, thereby driving the upper blocking plate 8 to displace, so that the upper blocking plate 8 cooperates with the lower blocking plate 12 to close the first flue outlet 3 and open the second flue outlet 4, and the furnace smoke enters through the flue inlet 2, and one end of the upper blocking plate 8 is inclined to guide the furnace smoke so that the furnace smoke is discharged from the second flue outlet 4, and one end of the upper blocking plate 8 is provided with a convex block to protect the connection end of the upper blocking plate 8 and the lower blocking plate 12 to prevent the furnace smoke from directly impacting the upper blocking plate 8 and the lower blocking plate 12 The connection end of the upper blocking plate 8 and the lower blocking plate 12 is protected;

[0055] If the smoke from the furnace needs to be discharged through the first flue outlet 3 and the second flue outlet 4, the driving motor 14 is started, driving a set of driving shafts 15 to rotate counterclockwise, and the two sets of driving shafts 15 rotate synchronously, thereby driving the lower baffle plate 12 to move, and the lower baffle plate 12 moves toward the second flue outlet 4, thereby pushing one end of the two sets of connecting rods 17 to move in the two sets of sliding grooves 16 respectively, thereby driving the two sets of limiting tooth plates 18 to move, and the two sets of limiting tooth plates 18 are respectively meshed and connected with the two sets of limiting gears 23, so the two sets of limiting gears 23 rotate, thereby driving the limiting shaft 22 to rotate, and then driving the guide plate 21 to rotate, so that the guide plate 21 is in an inclined state;

[0056] When the lower baffle plate 12 moves, one end of the lower baffle plate 12 is separated from one end of the upper baffle plate 12, so that the first flue outlet 3 and the second flue outlet 4 are both in an open state. After the smoke enters the flue body 1 through the flue inlet 2, the guide plate 21 guides part of the smoke to the second flue outlet 4 for discharge, and the rest of the smoke is discharged through the first flue outlet 3;

[0057] The present invention provides an upper baffle plate 8 and a lower baffle plate 12, and the upper baffle plate 8 is movably connected to one end of the lower baffle plate 12, thereby improving the stability of the upper baffle plate 8 and the lower baffle plate 12. The upper baffle plate 8 cooperates with the lower baffle plate 12 to reduce the loss of high-temperature flue gas and the decrease in heat transfer efficiency of the heated surface, while improving the safety of the upper baffle plate 8 and the lower baffle plate 12 in the operation of the waste heat boiler.

[0058] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A flue gas sealing device for a waste heat boiler, comprising a flue main body (1), an upper baffle plate (8) and a lower baffle plate (12), characterized in that: An upper baffle plate (8) and a lower baffle plate (12) are movably installed inside the flue main body (1), and the upper baffle plate (8) and the lower baffle plate (12) are movably connected; The upper end of the flue main body (1) is provided with a flue inlet (2), the lower end of the flue main body (1) is provided with a first flue outlet (3), and one side of the flue main body (1) is provided with a second flue outlet (4). An auxiliary seat (5) is symmetrically installed inside the flue main body (1), a support plate (10) is symmetrically installed at the upper end of the flue main body (1), and the inner walls of the two groups of support plates (10) are respectively movably connected to the outer walls of the two groups of auxiliary seats (5), a lower baffle plate (12) is movably installed on the inner wall of the flue main body (1), and a limiting column (19) is symmetrically installed on the inner wall of the flue main body (1), and the lower end outer wall of the upper baffle plate (8) and the lower end outer wall of the lower baffle plate (12) are respectively symmetrically provided with a first reserved groove (11) and a second reserved groove (13), and the inner walls of the two groups of first reserved grooves (11) and the inner walls of the two groups of second reserved grooves (13) are respectively movably connected to the outer walls of the two groups of limiting columns (19); A magnetic block is installed inside the lower end of the upper blocking plate (8), and a magnetic block is installed inside the upper end of the lower blocking plate (12), and the magnetic block inside the lower blocking plate (12) is attracted to the magnetic block inside the upper blocking plate (8).

2. The exhaust gas sealing device for a waste heat boiler according to claim 1, characterized in that: A driving motor (14) is installed on the outer wall of one side of the flue body (1), and driving shafts (15) are symmetrically installed inside the flue body (1), and one group of driving shafts (15) extends to one end of the outer wall of the flue body (1) and is connected to the output end of the driving motor (14), and the two groups of driving shafts (15) are connected by a synchronous belt, and the outer walls of the two groups of driving shafts (15) are provided with reciprocating thread grooves, and the outer walls of the two groups of driving shafts (15) are threadedly connected to the inner wall of the lower baffle plate (12).

3. The flue gas sealing device in a waste heat boiler according to claim 2, characterized in that: Two groups of linkage shafts (6) are symmetrically installed inside the flue main body (1), and the two groups of linkage shafts (6) are connected by a synchronous belt. One end of one group of linkage shafts (6) is provided with a one-way bearing (7), and one group of linkage shafts (6) is connected to a group of drive shafts (15) by a synchronous belt.

4. The flue gas sealing device in a waste heat boiler according to claim 3, characterized in that: The upper end of the upper baffle plate (8) is symmetrically mounted with a limit block (9), and the outer walls of the two groups of limit blocks (9) are movably connected to the inner walls of the two groups of auxiliary seats (5), and the outer walls of the two groups of linkage shafts (6) are both provided with reciprocating thread grooves, and the outer walls of the two groups of linkage shafts (6) are respectively threadedly connected to the inner walls of the two groups of limit blocks (9).

5. The flue gas sealing device in a waste heat boiler according to claim 4, characterized in that: The central end of the upper blocking plate (8) is arranged obliquely, and a protrusion is provided on the outer wall of one side of the central end of the upper blocking plate (8).

6. The exhaust gas sealing device for a waste heat boiler according to claim 2, characterized in that: The inner wall of the flue main body (1) is symmetrically provided with sliding grooves (16), and the inner walls of the two groups of sliding grooves (16) are movably installed with connecting rods (17), and the two groups of connecting rods (17) extend to the outer walls of the two groups of sliding grooves (16) respectively, and one end of each of the two groups of connecting rods (17) is movably connected to one end of the lower baffle plate (12), and one end of each of the two groups of connecting rods (17) is installed with a limiting tooth plate (18).

7. The flue gas sealing device in a waste heat boiler according to claim 6, characterized in that: A mounting seat (20) is installed on the inner wall of the flue main body (1), and the upper outer wall of the mounting seat (20) is movably connected to the upper outer wall of the lower baffle plate (12).

8. The flue gas sealing device in a waste heat boiler according to claim 7, characterized in that: A limit shaft (22) is movably mounted on the inner wall of the mounting seat (20), and limit gears (23) are mounted on both ends of the limit shaft (22) extending to the inner wall of the flue body (1), and two sets of limit gears (23) are respectively meshed and connected with two sets of limit tooth plates (18).

9. The flue gas sealing device in a waste heat boiler according to claim 8, characterized in that: A guide plate (21) is installed on the outer wall of the limiting shaft (22), and one end of the guide plate (21) is arranged in an arc shape.

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