An industrial flue gas heat recovery boiler

Abstract

The present application belongs to the technical field of heat recovery boiler, in particular to an industrial flue gas heat recovery boiler, which comprises a boiler shell, a flue gas tank, a heat exchange tank, a flue gas discharge tank and a water tank are sequentially arranged in the boiler shell from bottom to top, an inlet flue gas pipeline is fixed on the side wall of the flue gas discharge tank, an inlet water pipeline is fixed on the side wall of the water tank, and a flue gas discharge pipeline is arranged in the flue gas discharge tank and communicates with the outside; a spiral pipeline is fixed in the heat exchange tank; a water spraying assembly is arranged in the heat exchange tank and comprises a main pipe and a branch pipe, water is sprayed on both sides of the spiral pipeline by the main pipe, the branch pipe, a first spray head and a second spray head, so that the heat of the inner and outer side walls of the pipeline can be recovered at the same time, the heat recovery efficiency is improved, and the overall energy utilization rate of the boiler is improved.

Description

Technical Field

[0001] This invention belongs to the field of heat recovery boiler technology, specifically an industrial flue gas heat recovery boiler. Background Technology

[0002] A boiler is an energy conversion device whose main function is to convert different forms of input energy (such as the chemical energy of fuel or electrical energy) into heat energy to produce steam, high-temperature water, or organic heat carriers. Boilers achieve energy conversion and transfer through processes such as combustion and heat exchange, and are widely used in power generation, industrial heating, and heating systems.

[0003] Patent application CN111853735B discloses an industrial flue gas heat recovery boiler based on spiral spraying. The key technical points of the solution are: a boiler shell, sealing baffles, a flue gas emission box, a water tank, an insulation layer, a motor, a rotating shaft, a fan, a spiral flue gas duct, and a water outlet pipe. This technology allows industrial flue gas to enter the spiral flue gas duct, increasing its temperature. Simultaneously, water from the water tank is sprayed out through the outlet pipe. The sprayed water contacts the spiral flue gas duct, causing it to vaporize and generate a large amount of water vapor, thus achieving heat recovery from the industrial flue gas, saving significant energy and reducing environmental pollution. By setting up the spiral flue gas duct, the contact area between the industrial flue gas and the duct is increased, further increasing the contact area with water, thereby increasing the rate at which water is converted into water vapor per unit time, and ultimately improving the efficiency of water-to-water-vapor conversion.

[0004] However, the aforementioned technologies often have the following drawbacks: in existing boiler systems, the spray water only contacts the inner wall of the spiral flue gas duct, failing to effectively utilize the heat of the outer wall of the duct. This results in the heat of the outer wall of the duct not being recovered, causing a waste of heat recovery efficiency and thus affecting the overall energy utilization efficiency of the boiler. Therefore, this invention provides an industrial flue gas heat recovery boiler. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by this invention to solve its technical problem is: an industrial flue gas heat recovery boiler as described in this invention, comprising:

[0007] The boiler shell includes, from bottom to top, a flue gas box, a heat exchange box, a flue gas discharge box, and a water tank. The flue gas discharge box has a flue gas inlet pipe fixed to its side wall, and the water tank has a water inlet pipe fixed to its side wall. The flue gas discharge box has a flue gas exhaust pipe that communicates with the outside.

[0008] A spiral duct, which is fixed inside the heat exchange box, with its inlet end extending into the flue gas box and its outlet end extending into the flue gas emission box;

[0009] A water spray assembly is installed inside the heat exchange box. The water spray assembly includes a main pipe and branch pipes. The main pipe is vertically installed in the middle of the spiral pipe, and the top of the main pipe extends into the water tank. The branch pipes are provided with multiple sets of evenly installed vertically on the outside of the spiral pipe, and the top of the branch pipes is horizontally fixed to the side wall of the main pipe. Multiple sets of nozzles are evenly fixed on the side wall of the main pipe, and nozzles are fixed on the side of the branch pipe facing the spiral pipe.

[0010] A steam delivery pipe is installed on the boiler shell and is used to export the steam generated inside the heat exchange box.

[0011] Preferably, the first type of nozzle is provided in multiple groups and is evenly distributed in a longitudinal row on the outer wall of the main pipe. The number of the first type of nozzle is the same as the number of branch pipes. The second type of nozzle is located in the middle of two adjacent groups of first type nozzles.

[0012] Preferably, a motor is fixed at the top center of the boiler shell, a rotating shaft is fixed at the output end of the motor, a connecting shell is fixed at the top of the heat exchange box, the bottom end of the rotating shaft extends through to the bottom of the connecting shell, a fan is fixed at the bottom end of the rotating shaft, one end of the steam conveying pipe is fixedly connected to the connecting shell, the other end of the steam conveying pipe is connected to the outside, and the rotating shaft is sealed and rotatably connected to the partition between the boiler shell, the water tank and the flue gas emission box and the connecting shell.

[0013] Preferably, an mounting plate is installed on the partition between the heat exchange box and the flue gas emission box. The spiral pipe is fixedly connected to the mounting plate. A rotating ring is provided on the outer side of the mounting plate. The rotating ring is rotatably connected to the mounting plate and the partition respectively. The tops of the three branch pipes pass through the rotating ring and extend into the flue gas emission box. The main pipe is rotatably connected to the mounting plate and the water tank respectively. A second disc is fixed on the upper part of the main pipe. A plurality of vertical rods are evenly fixed on the lower end face of the second disc. A first disc is fixed on the rotating shaft. A lever capable of moving the vertical rods is fixed on the side wall of the first disc.

[0014] Preferably, the end of the flue gas duct that is away from the flue gas emission box extends out of the water tank.

[0015] Preferably, a frame-shaped support frame is provided in the middle of the water tank, and support seats are symmetrically fixed on both sides of the bottom of the water tank. The support frame is rotatably installed in the middle of the two support seats via an installation shaft. Fixing plates are fixed on the top of both sides of the support frame, and magnetic blocks are fixed on the bottom of both sides of the support frame. Magnetic block one is fixed on the top edge of the disc one. Magnetic block one and magnetic block two repel each other.

[0016] Preferably, a torsion spring is mounted on the mounting shaft to reset the support frame.

[0017] Preferably, the outer side of the boiler shell is provided with a heat insulation layer.

[0018] Preferably, a protective shell is fixed to the bottom of the water tank, and the protective shell covers the outside of the first disc and the second disc.

[0019] Preferably, a connecting pipe is fixed to the side of the exhaust pipe, and the connecting pipe is located inside the water tank.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. The industrial flue gas heat recovery boiler of the present invention sprays water onto the inner and outer sides of a spiral pipe through nozzle one and nozzle two. The water contacts the high-temperature sidewall of the spiral pipe, absorbs a large amount of heat, and vaporizes, generating a large amount of water vapor. The water vapor is discharged through the connecting shell and steam conveying pipe, thus realizing the conversion of heat from industrial flue gas. By utilizing water vapor, heat recovery from industrial flue gas is achieved, which is beneficial for energy conservation. By setting nozzle one and nozzle two to spray water simultaneously onto the inner and outer sides of the spiral pipe, heat from both the inner and outer walls of the pipe can be recovered simultaneously, thereby improving heat recovery efficiency and the overall energy utilization rate of the boiler. The spiral pipe increases the contact area with water, increasing the rate at which water is converted into water vapor per unit time, thus improving the efficiency of water-to-water-vapor conversion.

[0022] 2. The industrial flue gas heat recovery boiler of the present invention uses a motor to drive a rotating shaft and a fan to rotate. The fan generates upward lift to guide steam into the connecting shell, thereby improving steam discharge efficiency. When the motor drives the rotating shaft to rotate, the shaft drives a disc to rotate, which in turn drives a lever to rotate. When the lever abuts against a vertical rod on one side, it pushes the vertical rod and a second disc to rotate simultaneously. Then, the second disc drives the main pipe and branch pipe to rotate synchronously. When the lever has completely passed the vertical rod, the second disc stops rotating. This allows the main pipe and branch pipe to rotate intermittently, thereby intermittently adjusting the positions of nozzles one and two. This ensures that the water sprayed from nozzles one and two can contact different positions on both sides of the spiral pipe, preventing the spray water from always contacting the same position on the spiral pipe. This ensures that the spray water always contacts the high-temperature position of the spiral pipe, thus ensuring the steam generation efficiency. Attached Figure Description

[0023] The invention will now be further described with reference to the accompanying drawings.

[0024] Figure 1 This is a perspective view of the present invention;

[0025] Figure 2 This is a cross-sectional view of the present invention;

[0026] Figure 3 This is a schematic diagram showing the positional distribution of nozzle one and nozzle two of the present invention;

[0027] Figure 4 This is a partial structural cross-sectional view of the present invention;

[0028] Figure 5 yes Figure 4 Enlarged schematic diagram of the structure at point A in the middle.

[0029] In the diagram: 1. Boiler shell; 2. Insulation layer; 3. Flue gas inlet pipe; 4. Water inlet pipe; 5. Steam delivery pipe; 6. Flue gas outlet pipe; 7. Motor; 8. Flue gas box; 9. Heat exchange box; 10. Flue gas discharge box; 11. Rotating shaft; 12. Fan; 13. Main pipe; 14. Spiral pipe; 15. Branch pipe; 16. Nozzle 1; 17. Nozzle 2; 18. Water tank; 19. Protective shell; 20. Connecting shell; 21. Mounting plate; 22. Rotating ring; 23. Disc 1; 24. Lever; 25. Disc 2; 26. Vertical rod; 27. Magnetic block 1; 28. Support frame; 29. ​​Magnetic block 2; 30. Fixing plate; 31. Connecting pipe. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0031] Example 1: As Figures 1 to 5 As shown in the embodiment of the present invention, an industrial flue gas heat recovery boiler includes:

[0032] Boiler shell 1, inside which a flue gas box 8, a heat exchange box 9, a flue gas discharge box 10 and a water tank 18 are arranged sequentially from bottom to top. A flue gas inlet pipe 3 is fixed to the side wall of the flue gas discharge box 10, and a water inlet pipe 4 is fixed to the side wall of the water tank 18. A flue gas exhaust pipe 6 communicating with the outside is provided in the flue gas discharge box 10.

[0033] A spiral pipe 14 is fixed inside the heat exchange box 9. The inlet end of the spiral pipe 14 extends into the flue gas box 8, and the outlet end of the spiral pipe 14 extends into the flue gas emission box 10.

[0034] A water spray assembly is installed inside the heat exchange box 9. The water spray assembly includes a main pipe 13 and a branch pipe 15. The main pipe 13 is vertically installed in the middle of the spiral pipe 14, and the top end of the main pipe 13 extends into the water tank 18. The branch pipe 15 has multiple sets of evenly installed vertically on the outside of the spiral pipe 14, and the top end of the branch pipe 15 is horizontally fixed to the side wall of the main pipe 13. Multiple sets of nozzles 16 are evenly fixed on the side wall of the main pipe 13, and nozzles 17 are fixed on the side of the branch pipe 15 facing the spiral pipe 14.

[0035] Steam delivery pipe 5 is installed on the boiler shell 1, and steam generated inside the heat exchange box 9 is discharged through the steam delivery pipe 5.

[0036] During operation, high-temperature flue gas is introduced into the flue gas box 8 through the flue gas inlet pipe 3. The high-temperature flue gas enters the spiral pipe 14 and is then discharged through the flue gas discharge box 10 and the flue gas exhaust pipe 6. During this process, the temperature of the spiral pipe 14 rises. Simultaneously, water is injected into the water tank 18 through the water inlet pipe 4. The water enters the main pipe 13 and the branch pipe 15, and is sprayed onto the inner and outer sides of the spiral pipe 14 through nozzles 16 and 17. The water comes into contact with the high-temperature sidewalls of the spiral pipe 14, absorbs a large amount of heat, and vaporizes, thus generating a large amount of water vapor. The water vapor passes through the connecting shell 20. The steam is discharged through the steam conveying pipe 5, thereby realizing the conversion of heat from industrial flue gas. By utilizing water vapor, the heat from industrial flue gas can be recovered, which is beneficial for energy conservation. By setting nozzle 16 and nozzle 2 17 to spray water simultaneously on both the inner and outer sides of the spiral pipe 14, the heat from the inner and outer walls of the pipe can be recovered simultaneously, thereby improving the heat recovery efficiency and thus improving the overall energy utilization rate of the boiler. The spiral pipe 14 increases the contact area with water, increasing the speed at which water is converted into water vapor per unit time, thereby improving the efficiency of water to water vapor conversion.

[0037] Multiple sets of nozzles 16 are evenly distributed in a longitudinal row on the outer wall of the main pipe 13. The number of sets of nozzles 16 is the same as the number of branch pipes 15. A second nozzle 17 is positioned between two adjacent sets of nozzles 16. During operation, multiple sets of nozzles 16 and 17 are arranged correspondingly, and their positions are staggered. This allows water sprayed from nozzles 16 and 17 to contact different positions on the spiral pipe 14. (The last sentence appears to be incomplete and possibly refers to a different configuration of nozzles 16 and 17.) The number of corresponding groups of nozzle 17 divides the spray area. The number of spray areas is twice the number of corresponding groups of nozzle 16 and nozzle 17. For example, if there are three groups of nozzle 16 and nozzle 17, then there are six spray areas on both the inner and outer sides of the spiral pipe 14. By adjusting nozzle 16 and nozzle 17, they can spray only the area directly opposite each other, so that they can be converted into water vapor in their respective areas. The spray water sprayed in opposite directions will not affect the water vapor generation in each other's areas, so as to improve the water vapor conversion efficiency.

[0038] A motor 7 is fixed at the top center of the boiler shell 1, and a rotating shaft 11 is fixed at the output end of the motor 7. A connecting shell 20 is fixed at the top of the heat exchange box 9. The bottom end of the rotating shaft 11 extends through to the bottom of the connecting shell 20, and a fan 12 is fixed at the bottom end of the rotating shaft 11. One end of the steam conveying pipe 5 is fixedly connected to the connecting shell 20, and the other end of the steam conveying pipe 5 is connected to the outside. The rotating shaft 11 is sealed and rotatably connected to the partition between the boiler shell 1, the water tank 18, and the flue gas emission box 10, as well as to the connecting shell 20. During operation, the rotating shaft 11 and the fan 12 are driven to rotate by the motor 7. The fan 12 generates upward lift to guide water vapor into the connecting shell 20 and finally discharge it from the steam conveying pipe 5, thereby improving the steam discharge efficiency.

[0039] An mounting plate 21 is installed on the partition between the heat exchange box 9 and the flue gas emission box 10. The spiral pipe 14 is fixedly connected to the mounting plate 21. A rotating ring 22 is provided on the outer side of the mounting plate 21. The rotating ring 22 is rotatably connected to the mounting plate 21 and the partition respectively. The tops of the three branch pipes 15 pass through the rotating ring 22 and extend into the flue gas emission box 10. The main pipe 13 is rotatably connected to the mounting plate 21 and the water tank 18 respectively. A second disc 25 is fixed on the upper part of the main pipe 13. A plurality of vertical rods 26 are evenly fixed on the lower end face of the second disc 25. A first disc 23 is fixed on the rotating shaft 11. A lever 24 that can move the vertical rods 26 is fixed on the side wall of the first disc 23. During operation, when the nozzle sprays water onto the fixed position of the spiral pipe 14 for a long time, the water will continuously absorb heat at that position, which may cause the temperature in that area to drop, thereby affecting the rate of water vapor generation. Therefore, when the motor When shaft 11 rotates, it drives disc 23 to rotate, which in turn drives lever 24 to rotate. When lever 24 comes into contact with vertical rod 26 on one side, it pushes vertical rod 26 and disc 25 to rotate simultaneously. Then, disc 25 drives main pipe 13 and branch pipe 15 to rotate synchronously. When lever 24 has completely passed vertical rod 26, disc 25 stops rotating. This allows main pipe 13 and branch pipe 15 to rotate intermittently, thereby intermittently adjusting the positions of nozzles 16 and 17. This allows the water sprayed from nozzles 16 and 17 to contact different positions on both sides of the inner side of spiral pipe 14, so that nozzles 16 and 17 rotate toward adjacent un-sprayed positions on spiral pipe 14. This prevents the sprayed water from always contacting the same position on spiral pipe 14, ensuring that the sprayed water always contacts the high-temperature position of spiral pipe 14 and ensuring the efficiency of water vapor generation.

[0040] The end of the exhaust gas duct 6 away from the flue gas emission box 10 extends out of the water tank 18. During operation, the flue gas in the spiral duct 14, after heat exchange, still has a certain temperature. The treated flue gas passes through the exhaust gas duct 6 and can heat the water in the water tank 18. This preheating makes it easier for the water to turn into water vapor when it comes into contact with the spiral duct 14 after being sprayed from nozzle 16 and nozzle 27, thus improving the efficiency of water vapor conversion and further enhancing the heat recovery and utilization rate of the flue gas.

[0041] A frame-shaped support frame 28 is provided in the middle of the water tank 18. Support seats are symmetrically fixed on both sides of the bottom of the water tank 18. The support frame 28 is rotatably mounted in the middle of the two support seats via an installation shaft. Fixing plates 30 are fixed on the top of both sides of the support frame 28, and magnetic blocks 29 are fixed on the bottom of both sides of the support frame 28. Magnetic blocks 27 are fixed on the top edge of the disc 23. Magnetic blocks 27 and magnetic blocks 29 repel each other. During operation, when the disc 23 rotates, it synchronously drives magnetic blocks 27 to rotate. When magnetic blocks 27 move to a position directly below magnetic blocks 29, the repulsive force between magnetic blocks 27 and magnetic blocks 29 pushes the support frame 28 to rotate around the installation shaft, thereby causing the fixing plates 30 to agitate the water inside the water tank 18, so that the heat exchange between the exhaust pipe and the water in the water tank 18 is more uniform.

[0042] A torsion spring is installed on the mounting shaft to reset the support frame 28. During operation, when magnetic block 1 27 and magnetic block 29 are opposite each other, they push the support frame 28 to rotate and agitate the water. When magnetic block 1 27 and magnetic block 29 are misaligned, the torsion spring pulls the support frame 28 downward to agitate the water again, so that the heat of the exhaust pipe can be quickly transferred to other locations.

[0043] The boiler shell 1 is provided with an insulation layer 2 on its outer side. During operation, the insulation layer 2 on the outer side of the boiler shell 1 can effectively reduce heat loss and make better use of the heat energy inside the boiler. The insulation layer 2 reduces heat loss by reducing heat transfer between the boiler shell surface and the environment, thereby improving the energy efficiency of the boiler.

[0044] The bottom of the water tank 18 is fixed with a protective shell 19, which covers the outside of the first disc 23 and the second disc 25. During operation, pollutants such as dust, grease, and acidic substances in the high-temperature flue gas are deposited on the surface of the discs, which not only affects the operating efficiency of the equipment, but may also cause corrosion, wear, or even blockage of the disc surface, shortening the service life of the equipment. Therefore, the protective shell 19 is set to protect the first disc 23 and the second disc 25, keep their surfaces clean, ensure smooth rotation, and extend their service life.

[0045] Example 2: Figure 2 As shown in the comparative embodiment one, another embodiment of the present invention is as follows: a connecting pipe 31 is fixed on the side of the exhaust pipe, and the connecting pipe 31 is set inside the water tank 18; during operation, the connecting pipe 31 is connected to the exhaust pipe 6, and the range of the exhaust pipe 6 is expanded by setting the connecting pipe 31 to increase the contact area with water and improve the heat exchange efficiency.

[0046] Working Principle: High-temperature flue gas is introduced into the flue gas box 8 through the flue gas inlet pipe 3. The high-temperature flue gas enters the spiral pipe 14 and is then discharged through the flue gas discharge box 10 and the flue gas discharge pipe 6. During this process, the temperature of the spiral pipe 14 increases. Simultaneously, water is injected into the water tank 18 through the water inlet pipe 4. Water is sprayed onto the inner and outer sides of the spiral pipe 14 through nozzles 16 and 17. The water comes into contact with the high-temperature sidewalls of the spiral pipe 14, absorbs a large amount of heat, and vaporizes, generating a large amount of water vapor. The water vapor is discharged through the connecting shell 20 and the steam conveying pipe 5, thus realizing the conversion of heat from industrial flue gas. By utilizing water vapor, heat recovery from industrial flue gas is achieved, which is beneficial for energy conservation. By setting nozzles 16 and 17 to spray water onto the inner and outer sides of the spiral pipe 14 simultaneously, heat from both the inner and outer walls of the pipe can be recovered at the same time, thereby improving heat recovery efficiency and improving the overall energy utilization rate of the boiler. The motor 7 drives the rotating shaft 11 and the fan 12 to rotate. When the fan 12 rotates, it generates upward lift to guide water vapor into the connecting housing 20 and finally discharge it from the steam delivery pipe 5, thereby improving steam discharge efficiency. When the motor 7 drives the rotating shaft 11 to rotate, the rotating shaft 11 drives the first disc 23 to rotate, and the first disc 23 drives the lever 24 to rotate. When the lever 24 abuts against the vertical rod 26 on one side, it pushes the vertical rod 26 and the second disc 25 to rotate simultaneously. Then, the second disc 25 drives the main pipe 13 and the branch pipe 15 to rotate synchronously. When the lever 24 has completely passed the vertical rod 26, the second disc 25 stops rotating. This allows the main pipe 13 and the branch pipe 15 to rotate intermittently, thereby intermittently adjusting the position of the first nozzle 16 and the second nozzle 17. This allows the water sprayed from the first nozzle 16 and the second nozzle 17 to contact different positions on both sides of the inner side of the spiral pipe 14, avoiding the spray water always contacting the same position of the spiral pipe 14. This ensures that the spray water always contacts the high-temperature position of the spiral pipe 14, ensuring the efficiency of water vapor generation.

[0047] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0048] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An industrial flue gas heat recovery boiler, characterized in that: include: The boiler shell includes, from bottom to top, a flue gas box, a heat exchange box, a flue gas discharge box, and a water tank. The flue gas discharge box has a flue gas inlet pipe fixed to its side wall, and the water tank has a water inlet pipe fixed to its side wall. The flue gas discharge box has a flue gas exhaust pipe that communicates with the outside. A spiral duct, which is fixed inside the heat exchange box, with its inlet end extending into the flue gas box and its outlet end extending into the flue gas emission box; A water spray assembly is installed inside the heat exchange box. The water spray assembly includes a main pipe and branch pipes. The main pipe is vertically installed in the middle of the spiral pipe, and the top of the main pipe extends into the water tank. The branch pipes are provided with multiple sets of evenly installed vertically on the outside of the spiral pipe, and the top of the branch pipes is horizontally fixed to the side wall of the main pipe. Multiple sets of nozzles are evenly fixed on the side wall of the main pipe, and nozzles are fixed on the side of the branch pipe facing the spiral pipe. A steam delivery pipe is installed on the boiler shell and the steam generated inside the heat exchange box is discharged through the steam delivery pipe. The first type of nozzle is provided in multiple groups and is evenly distributed in a longitudinal row on the outer wall of the main pipe. The number of the first type of nozzle is the same as the number of branch pipes. The second type of nozzle is located in the middle of two adjacent groups of first type nozzles. A motor is fixed at the top center of the boiler shell, and a rotating shaft is fixed at the output end of the motor. A connecting shell is fixed at the top of the heat exchange box. The bottom end of the rotating shaft extends through to the bottom of the connecting shell. A fan is fixed at the bottom end of the rotating shaft. One end of the steam conveying pipe is fixedly connected to the connecting shell, and the other end of the steam conveying pipe is connected to the outside. The rotating shaft is sealed and rotatably connected to the partition between the boiler shell, the water tank and the flue gas emission box and the connecting shell. An mounting plate is installed on the partition between the heat exchange box and the flue gas emission box. The spiral pipe is fixedly connected to the mounting plate. A rotating ring is provided on the outer side of the mounting plate. The rotating ring is rotatably connected to the mounting plate and the partition respectively. The tops of the three branch pipes pass through the rotating ring and extend into the flue gas emission box. The main pipe is rotatably connected to the mounting plate and the water tank respectively. A second disc is fixed on the upper part of the main pipe. Multiple vertical rods are evenly fixed on the lower end face of the second disc. A first disc is fixed on the rotating shaft. A lever that can move the vertical rods is fixed on the side wall of the first disc.

2. The industrial flue gas heat recovery boiler according to claim 1, characterized in that: The end of the flue gas duct that is furthest from the flue gas emission box extends out of the water tank.

3. An industrial flue gas heat recovery boiler according to claim 2, characterized in that: The water tank has a frame-shaped support frame in the middle, and support seats are symmetrically fixed on both sides of the bottom of the water tank. The support frame is rotatably installed in the middle of the two support seats through the mounting shaft. Fixing plates are fixed on the top of both sides of the support frame, and magnetic blocks are fixed on the bottom of both sides of the support frame. Magnetic block one is fixed on the top edge of the disc one. Magnetic block one and magnetic block two repel each other.

4. An industrial flue gas heat recovery boiler according to claim 3, characterized in that: A torsion spring is installed on the mounting shaft to reset the support frame.

5. An industrial flue gas heat recovery boiler according to claim 4, characterized in that: The boiler shell is provided with an insulation layer on the outside.

6. An industrial flue gas heat recovery boiler according to claim 5, characterized in that: The bottom of the water tank is fixed with a protective shell, which covers the outside of disc one and disc two.

7. An industrial flue gas heat recovery boiler according to claim 6, characterized in that: A connecting pipe is fixed to the side of the exhaust gas duct, and the connecting pipe is located inside the water tank.

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