Industrial flue gas heat recovery boiler

Abstract

The invention belongs to the technical field of heat energy recovery boilers, and particularly relates to an industrial flue gas heat recovery boiler which comprises a boiler shell, a flue gas box, a heat exchange box, a flue gas discharge box and a water tank are sequentially arranged in the boiler shell from bottom to top, a flue gas inlet pipeline is fixed to the side wall of the flue gas discharge box, and a water inlet pipe is fixed to the side wall of the water tank. A flue gas discharge pipeline communicated with the outside is arranged in the flue gas discharge box; the spiral pipeline is fixed in the heat exchange box; the water spraying assembly is arranged in the heat exchange box and comprises a main pipe and a branch pipe, water is sprayed to the inner side and the outer side of the spiral pipeline at the same time through the main pipe, the branch pipe, the first spray head, the second spray head and other structures, and therefore heat of the inner side wall and the outer side wall of the pipeline can be recycled at the same time, and the heat recycling efficiency is improved; and the overall energy utilization rate of the boiler is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of heat recovery boilers, in particular to an industrial flue gas heat recovery boiler. Background Art

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

[0003] A patent application CN111853735B discloses an industrial flue gas heat recovery boiler based on spiral spraying, and the key points of its technical solution are: including a boiler shell, a sealing baffle, a flue gas discharge 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, the temperature of the spiral flue gas duct increases, and at the same time, the water in the water tank is sprayed out through the water outlet of the water outlet pipe, and the sprayed water contacts the spiral flue gas duct, the water is gasified, and a large amount of water vapor is generated, thereby realizing the heat recovery of the industrial flue gas, thereby saving a lot of energy and reducing environmental pollution; by setting up the spiral flue gas duct, the contact area between the industrial flue gas and the spiral flue gas duct is increased, and the contact area between the industrial flue gas and the water is increased, thereby increasing the speed of water conversion into water vapor per unit time, thereby improving the efficiency of water conversion into water vapor.

[0004] However, the above technology often has the following defects: the spray water in the existing boiler system only contacts the inner wall of the spiral flue gas pipe, but fails to effectively utilize the heat of the outer wall of the pipe, resulting in the heat of the outer wall of the pipe not being recovered, resulting in a waste of heat recovery efficiency, thereby affecting the overall energy utilization efficiency of the boiler. To this end, the present invention provides an industrial flue gas heat recovery boiler. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the present invention to solve the technical problem is: an industrial flue gas heat recovery boiler described in the present invention comprises:

[0007] A boiler shell, wherein a smoke box, a heat exchange box, a smoke exhaust box and a water tank are arranged inside the boiler shell from bottom to top, a smoke inlet pipe is fixed to the side wall of the smoke exhaust box, a water inlet pipe is fixed to the side wall of the water tank, and a smoke exhaust pipe connected to the outside is arranged in the smoke exhaust box;

[0008] A spiral pipe, wherein the spiral pipe is fixed inside the heat exchange box, the inlet end of the spiral pipe extends into the flue gas box, and the outlet end of the spiral pipe extends into the flue gas discharge box;

[0009] A water spray assembly, the water spray assembly is arranged inside the heat exchange box, the water spray assembly includes a main pipe and a branch pipe, the main pipe is vertically arranged in the middle of the spiral pipe, the top of the main pipe extends to the inside of the water tank, the branch pipe is provided with multiple groups and evenly arranged vertically outside the spiral pipe, and the top of the branch pipe is transversely fixed on the side wall of the main pipe, and multiple groups of nozzles 1 are evenly fixed on the side wall of the main pipe, and nozzles 2 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 the steam generated inside the heat exchange box is discharged through the steam delivery pipe.

[0011] Preferably, the nozzles 1 are provided in multiple groups and are evenly distributed in a vertical column on the outer wall of the main pipe, the number of the nozzles 1 groups is the same as the number of the branch pipes, and the nozzles 2 are arranged in the middle of two adjacent groups of nozzles 1.

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

[0013] Preferably, a mounting plate is installed on the partition between the heat exchange box and the flue gas exhaust 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 respectively connected to the mounting plate and the partition in a sealing and rotatable manner, the tops of the three branch pipes respectively penetrate the rotating rings and extend into the flue gas exhaust box, the main pipe is respectively connected to the mounting plate and the water tank in a sealing and rotatable manner, a disc 2 is fixed on the upper part of the main pipe, a plurality of vertical rods are evenly fixed on the lower end surface of the disc 2, a disc 1 is fixed on the rotating shaft, and a lever capable of moving the vertical rods is fixed on the side wall of the disc 1.

[0014] Preferably, one end of the smoke exhaust duct away from the smoke exhaust box passes through the water tank.

[0015] Preferably, a frame-shaped support frame is provided in the middle of the water tank, 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 support seats on both sides through an installation axis, fixed plates are respectively fixed on the top of both sides of the support frame, magnetic blocks 2 are respectively fixed on the bottom of both sides of the support frame, magnetic block 1 is fixed on the top edge of disk 1, and magnetic block 1 and magnetic block 2 repel each other.

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

[0017] Preferably, a heat-insulating layer is provided on the outer side of the boiler shell.

[0018] Preferably, a protective shell is fixed at the bottom of the water tank, and the protective shell cover is arranged on the outside of the first disc and the second disc.

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

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

[0021] 1. The industrial flue gas heat recovery boiler described in the present invention sprays water on both sides of the spiral pipe through nozzles 1 and 2. The water contacts the high-temperature side wall of the spiral pipe, absorbs a large amount of heat and vaporizes, thereby generating a large amount of water vapor. The water vapor is discharged through the connection shell and the steam delivery pipe, thereby realizing the conversion of industrial flue gas heat. By utilizing water vapor, the heat of industrial flue gas is recovered, which is beneficial to saving energy; by arranging nozzles 1 and 2 to spray water on both sides of the spiral pipe at the same time, the heat of the inner and outer walls of the pipe can be recovered at the same time, so as to improve the heat recovery efficiency, thereby improving the overall energy utilization rate of the boiler; the use of spiral pipes increases the contact area with water, increases the speed of water conversion into water vapor per unit time, and thereby improves the efficiency of water conversion into water vapor.

[0022] 2. An industrial flue gas heat recovery boiler described in the present invention drives the rotating shaft and the fan to rotate by a motor, and the fan generates an upward lift to guide the water vapor into the connecting shell to improve the steam exhaust efficiency; when the motor drives the rotating shaft to rotate, the rotating shaft drives the disc one to rotate, and the disc one drives the lever to rotate. When the lever abuts against the vertical rod on one side, it pushes the vertical rod and the disc two to rotate at the same time, and then the disc two drives the main pipe and the branch pipe to rotate synchronously. When the lever completely passes the vertical rod, the disc two stops rotating, so that the main pipe and the branch pipe can achieve intermittent rotation, and then the positions of the nozzles one and two are intermittently adjusted, so that the water sprayed from the nozzles one and two can contact different positions on both sides of the inner side of the spiral pipe, avoiding that the spray water always contacts the same position of the spiral pipe, so that the spray water can always contact the high-temperature position of the spiral pipe, ensuring the water vapor generation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] Figure 1 is a stereogram of the present invention;

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

[0026] Figure 3 It is a schematic diagram of the position distribution of nozzle 1 and nozzle 2 of the present invention;

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

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

[0029] In the figure: 1. boiler shell; 2. insulation layer; 3. flue gas inlet pipe; 4. water inlet pipe; 5. steam delivery pipe; 6. flue gas exhaust pipe; 7. motor; 8. flue gas box; 9. heat exchange box; 10. flue gas exhaust box; 11. rotating shaft; 12. fan; 13. main pipe; 14. spiral pipe; 15. branch pipe; 16. nozzle one; 17. nozzle two; 18. water tank; 19. protective shell; 20. connecting shell; 21. mounting plate; 22. rotating ring; 23. disc one; 24. lever; 25. disc two; 26. vertical rod; 27. magnet one; 28. support frame; 29. ​​magnet two; 30. fixing plate; 31. connecting pipe. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0031] Embodiment 1: Figures 1 to 5 As shown, an industrial flue gas heat recovery boiler according to an embodiment of the present invention comprises:

[0032] A boiler shell 1, wherein a smoke box 8, a heat exchange box 9, a smoke exhaust box 10 and a water tank 18 are arranged in sequence from bottom to top inside the boiler shell 1, a smoke inlet pipe 3 is fixed to the side wall of the smoke exhaust box 10, a water inlet pipe 4 is fixed to the side wall of the water tank 18, and a smoke exhaust pipe 6 communicating with the outside is arranged in the smoke exhaust box 10;

[0033] A spiral pipe 14, wherein the 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 discharge box 10;

[0034] A water spray assembly, which is arranged inside the heat exchange box 9, and includes a main pipe 13 and a branch pipe 15. The main pipe 13 is vertically arranged in the middle of the spiral pipe 14, and the top of the main pipe 13 extends to the inside of the water tank 18. The branch pipe 15 is provided with multiple groups and evenly arranged vertically outside the spiral pipe 14, and the top of the branch pipe 15 is transversely fixed on the side wall of the main pipe 13, and multiple groups of nozzles 16 are evenly fixed on the side wall of the main pipe 13. The branch pipe 15 is fixed with a nozzle 2 17 on the side facing the spiral pipe 14;

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

[0036] During operation, high-temperature flue gas is introduced into the flue box 8 through the flue gas inlet pipe 3, and the high-temperature flue gas enters the spiral pipe 14, and then is discharged through the flue gas discharge box 10 and the flue gas exhaust pipe 6. During the process, the temperature of the spiral pipe 14 is increased, and 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 the water is sprayed on the inner and outer sides of the spiral pipe 14 through the nozzle 16 and the nozzle 2 17. The water contacts the high-temperature side wall of the spiral pipe 14, absorbs a large amount of heat, vaporizes, and then generates a large amount of water vapor. The water vapor passes through the connecting shell 20 The water is discharged through the steam delivery pipe 5, thereby realizing the conversion of the heat of the industrial flue gas. By utilizing water vapor, the heat of the industrial flue gas is recovered, which is beneficial to energy saving. By arranging nozzle 1 16 and nozzle 2 17, water is sprayed on both sides of the spiral pipe 14 at the same time, so that the heat of the inner and outer walls of the pipe can be recovered at the same time, so as to improve the heat recovery efficiency and thus improve the overall energy utilization rate of the boiler. The spiral pipe 14 is used to increase the contact area with water, increase the speed of water conversion into water vapor per unit time, and thus improve the efficiency of water conversion into water vapor.

[0037] The nozzles 16 are provided in multiple groups and are evenly distributed in a vertical column on the outer wall of the main pipe 13. The number of the nozzles 16 is the same as the number of the branches 15. The nozzles 17 are arranged between two adjacent groups of nozzles 16. When working, the nozzles 16 and 17 are provided in multiple groups corresponding to each other, and the positions of the nozzles 16 and 17 are staggered, so that the water sprayed from the nozzles 16 and 17 can contact different positions of the spiral pipe 14. The corresponding number of groups of nozzle 17 is used to divide the spraying areas. The number of spraying areas is twice the corresponding number of groups of nozzle 16 and nozzle 2 17. For example, if nozzle 1 16 and nozzle 2 17 are three groups respectively, then there are six spraying areas on both sides of the spiral pipe 14. By adjusting nozzle 1 16 and nozzle 2 17, the two only spray the areas facing 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, a rotating shaft 11 is fixed on the output end of the motor 7, a connecting shell 20 is fixed on the top of the heat exchange box 9, the bottom end of the rotating shaft 11 extends through and extends to the bottom of the connecting shell 20, a fan 12 is fixed to the bottom end of the rotating shaft 11, one end of the steam delivery pipe 5 is fixedly connected to the connecting shell 20, and the other end of the steam delivery pipe 5 is connected to the outside, and the rotating shaft 11 is respectively connected to the boiler shell 1, the partition between the water tank 18 and the flue gas exhaust box 10 and the connecting shell 20 in a sealed and rotatable manner; when working, the rotating shaft 11 and the fan 12 are driven to rotate by the motor 7, and the fan 12 generates an upward lift to guide the water vapor into the connecting shell 20, and finally discharged from the steam delivery pipe 5, so as to improve the steam discharge efficiency

[0039] A mounting plate 21 is installed on the partition between the heat exchange box 9 and the flue gas discharge box 10, the spiral pipe 14 is fixedly connected to the mounting plate 21, a rotating ring 22 is arranged on the outer side of the mounting plate 21, the rotating ring 22 is respectively connected to the mounting plate 21 and the partition in a sealed and rotatable manner, the tops of the three branch pipes 15 respectively pass through the rotating ring 22 and extend into the flue gas discharge box 10, the main pipe 13 is respectively connected to the mounting plate 21 and the water tank 18 in a sealed and rotatable manner, a 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 surface of the disc 25, a disc 1 23 is fixed on the rotating shaft 11, and a lever 24 capable of moving the vertical rod 26 is fixed on the side wall of the disc 1 23; during operation, when the nozzle sprays water to the fixed position of the spiral pipe 14 for a long time, the water will continuously absorb heat at this position, which may cause the temperature of this area to decrease, thereby affecting the generation rate of water vapor, so when the motor When the rotating shaft 11 is driven to rotate, the rotating shaft 11 drives the disc 1 23 to rotate, and the disc 1 23 drives the lever 24 to rotate. When the lever 24 abuts against the vertical rod 26 on one side, the vertical rod 26 and the disc 2 25 are pushed to rotate simultaneously, and then the main pipe 13 and the branch pipe 15 are driven to rotate synchronously through the disc 25. When the lever 24 completely passes the vertical rod 26, the disc 2 25 stops rotating, so that the main pipe 13 and the branch pipe 15 can realize intermittent rotation, and then the positions of the nozzle 1 16 and the nozzle 2 17 are intermittently adjusted, so that the water sprayed from the nozzle 1 16 and the nozzle 2 17 can contact different positions on both sides of the inner side of the spiral pipe 14, so that the nozzle 1 16 and the nozzle 2 17 rotate toward the adjacent position on the spiral pipe 14 that is not contacted by the spray water, so as to avoid the spray water always contacting the same position of the spiral pipe 14, so that the spray water can always contact the high-temperature position of the spiral pipe 14, and ensure the efficiency of water vapor generation.

[0040] The end of the flue gas duct 6 away from the flue gas discharge box 10 passes through the water tank 18; when working, the flue gas that has undergone heat exchange in the spiral pipe 14 still has a certain temperature, and the treated flue gas passes through the flue gas duct 6, which can heat the water in the water tank 18, so as to preheat the water in the water tank 18, so that the water sprayed from the nozzle 1 16 and the nozzle 2 17 can be more easily converted into water vapor when it contacts the spiral pipe 14, thereby improving the efficiency of conversion into water vapor and further improving the heat recovery rate in the flue gas.

[0041] A frame-shaped support frame 28 is arranged in the middle of the water tank 18, and support seats are symmetrically fixed on both sides of the bottom of the water tank 18. The support frame 28 is rotatably installed in the middle of the support seats on both sides through the installation axis, and fixing plates 30 are respectively fixed to the tops of both sides of the support frame 28, and magnetic blocks 29 are respectively fixed to the bottoms of both sides of the support frame 28. A magnetic block 27 is fixed to the top edge of the disk 1 23, and the magnetic block 1 27 and the magnetic block 2 29 repel each other. During operation, when the disk 1 23 rotates, the magnetic block 1 27 is synchronously driven to rotate. When the magnetic block 1 27 moves to the vertical bottom of the magnetic block 29, the repulsive force between the magnetic block 1 27 and the magnetic block 2 29 pushes the support frame 28 to rotate around the installation axis, thereby driving the fixing plate 30 to stir the water inside the water tank 18, so that the heat exchange between the smoke 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 the magnetic block 1 27 and the magnetic block 29 are relative to each other, the support frame 28 is pushed to rotate to stir the water. When the magnetic block 1 27 and the magnetic block 29 are offset, the support frame 28 is pulled downward by the torsion spring to stir the water again, so that the heat in the smoke exhaust pipe can be quickly transferred to other positions.

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

[0044] A protective shell 19 is fixed to the bottom of the water tank 18, and the protective shell 19 is arranged to cover the outside of the disc 1 23 and the disc 2 25; when working, pollutants such as dust, grease, acidic substances in the high-temperature flue gas are deposited on the surface of the turntable, which not only affects the operating efficiency of the equipment, but also may cause corrosion, wear and even blockage on the turntable surface, shortening the service life of the equipment. Therefore, the protective shell 19 is provided to protect the disc 1 23 and the disc 2 25, so that their surfaces are kept clean, smooth rotation is guaranteed, and the service life is extended.

[0045] Embodiment 2: Figure 2 As shown, compared with Example 1, another embodiment of the present invention is: a connecting pipe 31 is fixed to the side of the smoke exhaust pipe, and the connecting pipe 31 is arranged inside the water tank 18; when working, the connecting pipe 31 is connected to the smoke exhaust pipe 6, and the range of the smoke 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 box 8 through the flue gas inlet pipe 3, and the high-temperature flue gas enters the spiral pipe 14, and then is discharged through the flue gas discharge box 10 and the flue gas exhaust pipe 6. During the process, the temperature of the spiral pipe 14 is increased, and water is injected into the water tank 18 through the water inlet pipe 4. Water is sprayed on the inside and outside of the spiral pipe 14 through the nozzle 16 and the nozzle 2 17. The water contacts the high-temperature side wall of the spiral pipe 14, and the water absorbs a large amount of heat to vaporize, thereby generating a large amount of water vapor. The water vapor is discharged through the connecting shell 20 and the steam delivery pipe 5, thereby realizing the conversion of industrial flue gas heat. By utilizing water vapor, the heat of industrial flue gas is recovered, which is beneficial to saving energy; by arranging the nozzle 16 and the nozzle 2 17, water is sprayed on the inside and outside of the spiral pipe 14 at the same time, so that the heat of the inner and outer walls of the pipe can be recovered at the same time, so as to improve the heat recovery efficiency and thus improve the overall energy utilization rate of the boiler; the motor 7 drives the shaft 11 and the fan 12 to rotate When the motor 7 drives the rotating shaft 11 to rotate, the disc 1 23 is driven to rotate through the rotating shaft 11, and the disc 1 23 drives the lever 24 to rotate. When the lever 24 abuts against the vertical rod 26 on one side, the vertical rod 26 and the disc 2 25 are pushed to rotate at the same time, and then the main pipe 13 and the branch pipe 15 are driven to rotate synchronously through the disc 25. When the lever 24 completely passes through the vertical rod 26, the disc 2 25 stops rotating, so that the main pipe 13 and the branch pipe 15 can realize intermittent rotation, and then the positions of the nozzle 1 16 and the nozzle 2 17 are intermittently adjusted, so that the water sprayed from the nozzle 1 16 and the nozzle 2 17 can contact different positions on both sides of the inner side of the spiral pipe 14, avoiding that the spray water always contacts the same position of the spiral pipe 14, so that the spray water can always contact the high temperature position of the spiral pipe 14, ensuring the efficiency of water vapor generation.

[0047] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1 As a benchmark, according to the person's observation perspective, 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 the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0049] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An industrial flue gas heat recovery boiler, characterized in that: include: A boiler shell, wherein a smoke box, a heat exchange box, a smoke exhaust box and a water tank are arranged inside the boiler shell from bottom to top, a smoke inlet pipe is fixed to the side wall of the smoke exhaust box, a water inlet pipe is fixed to the side wall of the water tank, and a smoke exhaust pipe connected to the outside is arranged in the smoke exhaust box; A spiral pipe, wherein the spiral pipe is fixed inside the heat exchange box, the inlet end of the spiral pipe extends into the flue gas box, and the outlet end of the spiral pipe extends into the flue gas discharge box; A water spray assembly, the water spray assembly is arranged inside the heat exchange box, the water spray assembly includes a main pipe and a branch pipe, the main pipe is vertically arranged in the middle of the spiral pipe, the top of the main pipe extends to the inside of the water tank, the branch pipe is provided with multiple groups and evenly arranged vertically outside the spiral pipe, and the top of the branch pipe is transversely fixed on the side wall of the main pipe, and multiple groups of nozzles 1 are evenly fixed on the side wall of the main pipe, and nozzles 2 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.

2. The industrial flue gas heat recovery boiler according to claim 1, characterized in that: The nozzles 1 are provided in multiple groups and are evenly distributed in a vertical column on the outer wall of the main pipe. The number of the nozzles 1 is the same as the number of the branch pipes. The nozzles 2 are arranged in the middle of two adjacent groups of nozzles 1.

3. The industrial flue gas heat recovery boiler according to claim 2, characterized in that: A motor is fixed at the top center of the boiler shell, a rotating shaft is fixed on the output end of the motor, a connecting shell is fixed on the top of the heat exchange box, the bottom end of the rotating shaft extends through and extends to the bottom of the connecting shell, a fan is fixed to the bottom end of the rotating shaft, one end of the steam delivery pipe is fixedly connected to the connecting shell, and the other end of the steam delivery pipe is connected to the outside, and the rotating shaft is respectively connected to the boiler shell, the partition between the water tank and the flue gas exhaust box, and the connecting shell in a sealing and rotatable manner.

4. The industrial flue gas heat recovery boiler according to claim 3, characterized in that: A mounting plate is installed on the partition between the heat exchange box and the flue gas exhaust box, the spiral pipe is fixedly connected to the mounting plate, a rotating ring is arranged on the outer side of the mounting plate, the rotating ring is respectively connected to the mounting plate and the partition in a sealing and rotatable manner, the tops of the three branch pipes respectively penetrate the rotating rings and extend into the flue gas exhaust box, the main pipes are respectively connected to the mounting plate and the water tank in a sealing and rotatable manner, a disc 2 is fixed on the upper part of the main pipe, a plurality of vertical rods are evenly fixed on the lower end surface of the disc 2, a disc 1 is fixed on the rotating shaft, and a lever capable of moving the vertical rods is fixed on the side wall of the disc 1.

5. The industrial flue gas heat recovery boiler according to claim 4, characterized in that: One end of the smoke exhaust pipe away from the smoke exhaust box passes through the water tank.

6. The industrial flue gas heat recovery boiler according to claim 5, characterized in that: A frame-shaped support frame is arranged in the middle of the water tank, 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 support seats on both sides through the installation shaft, fixing plates are respectively fixed on the top of both sides of the support frame, magnetic blocks 2 are respectively fixed on the bottom of both sides of the support frame, magnetic block 1 is fixed on the top edge of the disc 1, and magnetic block 1 and magnetic block 2 repel each other.

7. The industrial flue gas heat recovery boiler according to claim 6, characterized in that: A torsion spring for resetting the support frame is installed on the installation shaft.

8. The industrial flue gas heat recovery boiler according to claim 7, characterized in that: A heat-insulating layer is arranged on the outer side of the boiler shell.

9. The industrial flue gas heat recovery boiler according to claim 8, characterized in that: A protective shell is fixed at the bottom of the water tank, and the protective shell cover is arranged on the outer sides of the first disc and the second disc.

10. The industrial flue gas heat recovery boiler according to claim 9, characterized in that: A connecting pipe is fixed on the side of the smoke exhaust pipe, and the connecting pipe is arranged inside the water tank.

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