Flue gas desulfurization device for boiler in heat supply plant

Abstract

The invention relates to the technical field of waste gas treatment, in particular to a heat supply plant boiler flue gas desulfurization device which comprises a desulfurization tower, a gas inlet is formed in one side of the bottom of the desulfurization tower, a gas outlet is formed in the top of the desulfurization tower, and the heat supply plant boiler flue gas desulfurization device further comprises a fixing frame fixedly arranged on the inner side of the desulfurization tower; the constant-speed spraying units are rotationally arranged on the fixing frame, and a speed reducing mechanism is arranged between every two adjacent constant-speed spraying units; the driving assembly is arranged on the fixed frame and is used for driving the constant-speed spraying unit to rotate in the desulfurizing tower; the gas distribution assembly is arranged at the bottom of the fixing frame and can uniformly disperse flue gas introduced from the gas inlet into the desulfurization tower, according to the boiler flue gas desulfurization device for the heat supply plant, through the designed gas distribution assembly and the constant-speed spraying unit, the flue gas can be uniformly distributed in the desulfurization tower and is fully mixed and reacted with alkali liquor, so that an efficient desulfurization effect is achieved, and the desulfurization efficiency is improved. The content of sulfur oxides in the flue gas is greatly reduced, and the environmental protection requirement is met.

Description

Technical Field

[0001] The invention relates to the technical field of waste gas treatment, in particular to a flue gas desulfurization device for a boiler in a heating plant. Background Art

[0002] During the operation of thermal power plants, boiler combustion will inevitably produce a large amount of flue gas rich in sulfur oxides. If it is directly discharged without proper treatment, it will not only cause serious air pollution problems, but also cause long-term and irreversible damage to the environment, while causing huge economic losses and increased social costs. Therefore, changing the current air quality and optimizing people's living environment has become a major issue that needs to be solved urgently. In this context, flue gas desulfurization technology, as one of the key measures to reduce sulfur dioxide (SO2) emissions from coal-fired boilers, has become increasingly important.

[0003] As a highly efficient flue gas purification equipment, the desulfurization and dust removal tower is designed to effectively remove harmful substances in the flue gas through specific chemical reactions and physical filtration processes, so as to meet the country's strict emission standards. Specifically, this technology uses alkaline solution (such as lime milk, sodium hydroxide solution, etc.) as an absorbent to react chemically with sulfur oxides (mainly SO2) in the flue gas to generate harmless or low-toxic compounds. Subsequently, the flue gas treated with chemical reactions enters the dust removal tower, where particulate matter is further removed through a fine filtration mechanism to ensure that the final flue gas emitted is both clean and meets environmental protection requirements.

[0004] However, it is worth noting that the air inlet design of the existing desulfurization tower is often limited to one side of the tower body. This layout limits the effective dispersion and uniform mixing of the flue gas, which in turn affects the efficiency and uniformity of the desulfurization reaction, and may lead to incomplete desulfurization in some areas, affecting the overall purification effect. For this reason, we propose a flue gas desulfurization device for boilers in heating plants. Summary of the invention

[0005] In order to solve the above technical problems, the embodiment of the present application provides a flue gas desulfurization device for a heating plant boiler, comprising a desulfurization tower, an air inlet is arranged on one side of the bottom of the desulfurization tower, an air outlet is arranged on the top of the desulfurization tower, and further comprising:

[0006] A fixed frame, fixedly arranged on the inner side of the desulfurization tower;

[0007] A uniform speed spray unit is rotatably mounted on a fixed frame and can perform uniform rotation spraying in the desulfurization tower. A plurality of uniform speed spray units are provided, and a deceleration mechanism is provided between two adjacent uniform speed spray units.

[0008] A driving assembly, arranged on a fixed frame, for driving the uniform speed spray unit to rotate in the desulfurization tower;

[0009] The air distribution component is arranged at the bottom of the fixed frame, and can evenly distribute the flue gas introduced from the air inlet into the desulfurization tower.

[0010] In some embodiments, the driving assembly includes a driving motor disposed below the fixing frame, a driving shaft is disposed at the output end of the driving motor, and a reduction mechanism is also connected to the top of the driving shaft.

[0011] In some embodiments, the uniform speed spray unit includes multiple rotating racks rotatably arranged in the desulfurization tower, the axes of the rotation centers of the multiple rotating racks coincide and are all located in the middle of the desulfurization tower, the lengths of the multiple rotating racks gradually increase from bottom to top, and a spray pipe is arranged at the end of the rotating rack. The spray pipe is connected to the alkali liquid circulation system, and multiple atomization holes are opened on the outside of the spray pipe.

[0012] In some embodiments, the atomization holes are provided in a plurality and are arranged in a circular array on the outside of the spray pipe, and the atomization holes are arranged obliquely on the spray pipe.

[0013] In some embodiments, a plurality of gear rings are fixedly mounted on the fixed frame, and a driven gear meshing with the gear rings is rotatably connected to the bottom of the spray pipe. When the rotating frame drives the spray pipe to rotate, the driven gear meshes with the gear rings to drive the spray pipe to rotate.

[0014] In some embodiments, the specifications of the driven gears at the bottom of the plurality of spray pipes are the same.

[0015] In some embodiments, the deceleration mechanism includes a plurality of support rods fixedly arranged on a fixed frame, the ends of the support rods are connected to a box body, a synchronization shaft is rotatably arranged in the box body, a reduction gear 1 and a reduction gear 2 are rotatably arranged at the upper and lower ends of the synchronization shaft, and a transmission gear 1 and a transmission gear 2 are also rotatably arranged in the box body, and the transmission gear 1 and the transmission gear 2 are respectively meshed with the reduction gear 1 and the reduction gear 2, a rotating shaft is arranged on the rotating frame, the transmission gear 1 and the transmission gear 2 located between the two rotating frames are respectively connected to the rotating shafts on the upper and lower rotating frames, and the transmission gear 1 and the transmission gear 2 located between the rotating frame and the driving shaft are respectively connected to the rotating shaft and the driving shaft.

[0016] In some embodiments, the air distribution assembly includes a fixed shaft rotatably arranged at the bottom of the fixed frame, blades and transmission bevel gears are respectively arranged at both ends of the fixed shaft, and a driving bevel gear meshing with the transmission bevel gear is arranged on the outer side of the driving shaft.

[0017] In some embodiments, a reciprocating thread is provided on the outside of the spray pipe, a rolling unit is provided on the threaded sleeve on the outside of the spray pipe, and an arc plate is fixedly provided on the outside of the support rod. When the spray pipe rotates and passes through the arc plate, the rolling unit contacts the surface of the arc plate and rolls, thereby moving outside the spray pipe.

[0018] In some embodiments, the rolling unit includes a slider threadedly mounted on the outside of the spray pipe, a roller is mounted on the outside of the slider, a slide groove is opened on the outside of the slider, a connecting block is slidably arranged in the slide groove, the slider is fixedly connected to the roller, support springs are arranged on the upper and lower sides of the slider, and the two ends of the support spring are respectively fixedly connected to the slider and the inner wall of the slide groove.

[0019] The present invention has at least the following beneficial effects:

[0020] 1. Efficient desulfurization: Through the designed gas distribution components and uniform spray unit, the flue gas can be evenly distributed inside the desulfurization tower and fully mixed with the alkali solution to achieve efficient desulfurization effect, which greatly reduces the sulfur oxide content in the flue gas and meets environmental protection requirements;

[0021] 2. Uniform distribution: The air distribution component uses the rotation of the blades to generate a negative pressure effect to attract and disperse the flue gas entering the desulfurization tower, ensuring the uniform distribution of the flue gas in the desulfurization tower. This avoids the problem of excessive concentration or uneven distribution of flue gas in a certain area and improves the desulfurization efficiency;

[0022] 3. Stable spraying: The design of the uniform-speed spray unit keeps the linear speed of each spray pipe consistent during operation, ensuring the uniform mixing of flue gas and alkali solution. At the same time, the self-rotation of the spray pipe and the inclined atomization holes further enhance the mixing effect, making the desulfurization process more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the cross-sectional structure of the desulfurization tower of the present invention;

[0025] Figure 3 This is a schematic diagram of the internal structure of the desulfurization tower of the present invention;

[0026] Figure 4 It is a partial side view structural schematic diagram of the present invention;

[0027] Figure 5 This is a schematic diagram of the uniform speed spray unit structure of the present invention;

[0028] Figure 6 This is an enlarged structural schematic diagram of location A of the present invention;

[0029] Figure 7 This is a schematic diagram of the structure of the air distribution assembly of the present invention;

[0030] Figure 8 It is a schematic diagram of the structure of the speed reduction mechanism of the present invention;

[0031] Fig. 9 This is a schematic diagram of the cross-sectional structure of the spray pipe of the present invention;

[0032] Fig.10 This is a schematic diagram of the outer structure of the drive shaft of the present invention;

[0033] Fig.11 It is a structural schematic diagram of the rolling unit of the present invention;

[0034] Fig.12 It is a schematic diagram of the specific structure of the rolling unit of the present invention.

[0035] In the figure: 1. desulfurization tower; 2. fixed frame; 3. uniform speed spray unit; 31. rotating frame; 32. spray pipe; 33. atomization hole; 34. gear ring; 35. driven gear; 4. reduction mechanism; 41. support rod; 42. housing; 43. synchronous shaft; 44. reduction gear 1; 45. reduction gear 2; 46. transmission gear 1; 47. transmission gear 2; 48. rotating shaft; 5. driving assembly; 51. driving motor; 52. driving shaft; 6. air distribution assembly; 61. fixed shaft; 62. blades; 63. transmission bevel gear; 64. driving bevel gear; 7. air inlet; 8. air outlet; 9. rolling unit; 91. slider; 92. roller; 93. slideway; 94. connecting block; 95. supporting spring; 10. arc plate. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Example 1: Please refer to Figure 1-Figure 9 The present invention provides a technical solution: a flue gas desulfurization device for a boiler in a heating plant, comprising a desulfurization tower 1, an air inlet 7 is arranged on one side of the bottom of the desulfurization tower 1, and the flue gas is introduced into the desulfurization tower 1 from the air inlet 7, and an air outlet 8 is arranged on the top of the desulfurization tower 1, and the treated flue gas is discharged through the air outlet 8 on the top, and also comprises a fixed frame 2 fixedly arranged on the inner side of the desulfurization tower 1, and a uniform speed spray unit 3 is rotatably arranged on the fixed frame 2, which can perform uniform rotation spraying in the desulfurization tower 1, and a plurality of uniform speed spray units 3 are arranged, which are evenly distributed inside the desulfurization tower 1, and a speed reduction mechanism 4 is arranged between two adjacent uniform speed spray units 3, and the lengths of the uniform speed spray units 3 are different, and then they are sequentially connected through the speed reduction mechanism 4 to keep the speed of their operating ends consistent, so as to ensure the uniform mixing of the flue gas and the alkali solution, and a driving component 5 for driving the uniform speed spray wheel unit to operate is arranged on the fixed frame 2;

[0038] The driving assembly 5 includes a driving motor 51 disposed below the fixing frame 2. A driving shaft 52 is disposed at the output end of the driving motor 51. A speed reduction mechanism 4 is also connected to the top of the driving shaft 52. The speed reduction mechanism 4 is further connected to the uniform speed spray unit 3 above it. When in operation, the driving motor 51 drives the driving shaft 52 to rotate, and then drives each uniform speed spray unit 3 to rotate through the speed reduction mechanism 4:

[0039] An air distribution assembly 6 is also provided at the bottom of the fixing frame 2, which can evenly disperse the flue gas introduced by the air inlet 7 into the desulfurization tower 1, thereby making the flue gas evenly distributed inside the desulfurization tower 1, and achieving a better effect of mixing and reacting with the alkali solution.

[0040] The uniform speed spray unit 3 includes a plurality of rotating frames 31 rotatably arranged in the desulfurization tower 1. The rotating frames 31 are cross-shaped as a whole. The axes of the rotation centers of the plurality of rotating frames 31 coincide and are all located in the middle of the desulfurization tower 1. A spray pipe 32 is arranged at the end of the rotating frame 31. The lengths of the various rotating frames 31 are not consistent so that the spray pipes 32 located at the ends of the rotating frames 31 can be evenly distributed in the internal space of the spray tower. The spray pipe 32 is connected to the alkali liquid circulation system, which is not drawn in the figure and is a prior art and will not be described here. A plurality of atomization holes 33 are opened on the outside of the spray pipe 32. The alkali liquid is pumped into the spray pipe 32 and then atomized and sprayed out from the atomization holes 33 to form small droplets that mix with the flue gas to react and achieve a better mixing effect of the two.

[0041] There are multiple atomization holes 33 arranged in a circular array on the outside of the spray pipe 32, so that when the spray pipe 32 revolves along the rotation center of the rotating frame 31, the multiple atomization holes 33 arranged thereon can spray the alkali solution in all directions in the desulfurization tower 1, and the atomization holes 33 are inclined on the spray pipe 32. Through the inclined atomization holes 33, convection can be formed between two adjacent spray pipes 32 when they are staggered, thereby ensuring sufficient contact between the flue gas and the alkali solution.

[0042] A plurality of gear rings 34 are fixedly provided on the fixed frame 2, and a driven gear 35 meshing with the gear ring 34 is rotatably connected to the bottom of the spray pipe 32. When the rotating frame 31 drives the spray pipe 32 to rotate, the driven gear 35 meshes with the gear ring 34 to drive the spray pipe 32 to rotate. Through such a design, when the rotating frame 31 drives the spray pipe 32 to revolve around its rotation center, the spray pipe 32 itself will also rotate, and a plurality of turbulent units can be formed in the desulfurization tower 1 to ensure the mixing effect of the flue gas and the alkali solution.

[0043] The specifications of the driven gears 35 at the bottom of multiple spray pipes 32 are the same. When the rotating frame 31 drives the spray pipes 32 to rotate, the linear speed of each spray pipe 32 during rotation is the same due to the action of the reduction mechanism 4. Then, the consistency of the driven gears 35 ensures that the spray pipes 32 have the same distance when moving and the same rotation speed, further ensuring the consistency of the flue gas distribution inside the desulfurization tower 1, so that it can be fully mixed and reacted with the alkali solution.

[0044] The speed reduction mechanism 4 includes a plurality of support rods 41 fixedly arranged on the fixed frame 2, the ends of the support rods 41 are connected to a box body 42, a synchronous shaft 43 is rotatably arranged in the box body 42, a reduction gear 1 44 and a reduction gear 2 45 are rotatably arranged at the upper and lower ends of the synchronous shaft 43, a transmission gear 1 46 and a transmission gear 2 47 are also rotatably arranged in the box body 42, the transmission gear 1 46 and the transmission gear 2 47 are respectively meshed with the reduction gear 1 44 and the reduction gear 2 45, a rotating shaft 48 is arranged on the rotating frame 31, the transmission gear 1 46 and the transmission gear 2 47 located between the two rotating frames 31 are respectively connected to the rotating shaft 48 on the upper and lower rotating frames 31, and the transmission gear 1 46 and the transmission gear 2 47 located between the rotating frame 31 and the driving shaft 52 are respectively connected to the rotating shaft 48 and the driving shaft 52;

[0045] The driving shaft 52 drives the transmission gear 2 47 on its outer side to rotate, and the transmission gear 2 47 drives the reduction gear 2 45 to rotate. The reduction gear 2 45 rotates coaxially with the reduction gear 1 44, and then the reduction gear 1 44 drives the transmission gear 1 46 to rotate, and then drives the rotating shaft 48 to rotate, and finally drives the rotating frame 31 to rotate, and so on. The transmission is realized by the cooperation of multiple gears between each rotating frame 31. In actual use, the transmission ratio between each gear needs to be adaptively changed according to the specifications of the rotating frame 31 and the power of the driving motor 51, so that the linear speed of each end of the rotating frame 31 is consistent during the rotation operation.

[0046] The air distribution component 6 includes a fixed shaft 61 rotatably arranged at the bottom of the fixed frame 2, blades 62 and transmission bevel gears 63 are respectively arranged at both ends of the fixed shaft 61, and a driving bevel gear 64 meshing with the transmission bevel gear 63 is arranged on the outer side of the driving shaft 52. The air distribution component 6 is located on the other three sides of the rotating frame 31 away from the air inlet 7. In this way, after the flue gas enters, the rotation of the driving shaft 52 can drive the driving bevel gear 64 to rotate, and the driving bevel gear 64 can drive the transmission bevel gear 63 to rotate, thereby driving the blades 62 to rotate, and negative pressure suction is performed on the flue gas, so that the flue gas is evenly distributed in the desulfurization tower 1.

[0047] First, the flue gas generated by the boiler of the thermal power plant is introduced into the desulfurization tower 1 through the air inlet 7 at the bottom of the desulfurization tower 1. In order to ensure that the flue gas can be evenly distributed and fully react with the alkali solution, the desulfurization device is designed with a set of air distribution components 6. When the drive motor 51 is started, the drive shaft 52 starts to rotate, and the drive bevel gear 64 on the outside of the drive shaft 52 rotates accordingly. Since the drive bevel gear 64 is meshed with the transmission bevel gear 63 in the air distribution component 6, the transmission bevel gear 63 will also start to rotate, thereby driving the blades 62 on the fixed shaft 61 to rotate.

[0048] The rotation of the blades 62 produces a negative pressure effect, which attracts and disperses the flue gas entering the desulfurization tower 1. Since the air distribution assembly 6 is located on the other three sides of the rotating frame 31 away from the air inlet 7, after the flue gas enters the desulfurization tower 1, it will be evenly guided by the blades 62 to the internal space of the desulfurization tower 1, avoiding the problem of excessive concentration or uneven distribution of the flue gas in a certain area.

[0049] At the same time, the uniform speed spray unit 3 on the fixed frame 2 also starts to work, and the driving motor 51 drives each uniform speed spray unit 3 to rotate and spray at a uniform speed in the desulfurization tower 1 through the reduction mechanism 4. Since the lengths of each uniform speed spray unit 3 are different, the linear speed of each spray pipe 32 during operation is kept consistent through precise adjustment of the reduction mechanism 4, thereby ensuring the uniformity of the mixing of the flue gas and the alkali solution.

[0050] Each rotating frame 31 is cross-shaped as a whole, and the axes of the rotating centers coincide with and are located in the middle of the desulfurization tower 1. A spray pipe 32 is provided at the end of the rotating frame 31, and the spray pipe 32 is connected to the alkali liquid circulation system. The alkali liquid is pumped into the spray pipe 32, and then atomized and sprayed out by a plurality of atomization holes 33 arranged in a circular array. The inclined arrangement of the atomization holes 33 enables convection to be formed between two adjacent spray pipes 32 when they are intertwined with each other, thereby further ensuring sufficient contact between the flue gas and the alkali liquid.

[0051] In addition, the spray pipe 32 will also rotate when rotating, because the multiple gear rings 34 fixed on the fixed frame 2 are meshed with the driven gear 35 at the bottom of the spray pipe 32. When the rotating frame 31 drives the spray pipe 32 to rotate, the driven gear 35 is meshed with the gear ring 34 to drive the spray pipe 32 to rotate. This design forms multiple turbulent units in the desulfurization tower 1, further enhancing the mixing effect of the flue gas and the alkali solution.

[0052] After being evenly distributed by the air distribution component 6 and fully mixed by the uniform speed spray unit 3, the sulfur oxides in the flue gas react chemically with the alkali solution to generate harmless or low-toxic compounds. Finally, the treated flue gas is discharged through the outlet 8 at the top of the desulfurization tower 1, meeting the national emission standards.

[0053] In the entire work process, the speed reduction mechanism 4 plays a vital role. It ensures that the linear speeds of each rotating frame 31 and the spray pipe 32 are consistent during rotation, thereby ensuring the consistency of the flue gas distribution inside the desulfurization tower 1 and the sufficient mixing reaction of the flue gas and the alkali solution. At the same time, the design of the air distribution component 6 and the uniform speed spray unit 3 also makes the desulfurization device more efficient and stable during operation.

[0054] Example 2: Please refer to Figure 10-12 In Example 2, based on Example 1, a reciprocating thread is provided on the outside of the spray pipe 32, a rolling unit 9 is provided on the threaded sleeve on the outside of the spray pipe 32, and an arc plate 10 is fixedly provided on the outside of the support rod 41. When the spray pipe 32 rotates and passes through the arc plate 10, the rolling unit 9 contacts the surface of the arc plate 10 and rolls, and then moves on the outside of the spray pipe 32.

[0055] The rolling unit 9 includes a slider 91 threadedly sleeved on the outside of the spray pipe 32, a roller 92 sleeved on the outside of the slider 91, a slide groove 93 opened on the outside of the slider 91, a connecting block 94 slidably arranged in the slide groove 93, the slider 91 is fixedly connected to the roller 92, and support springs 95 are arranged on the upper and lower sides of the slider 91, and the two ends of the support spring 95 are respectively fixedly connected to the slider 91 and the inner wall of the slide groove 93;

[0056] When the spray pipe 32 rotates, due to the self-locking property of the thread, the spray pipe 32 and the slider 91 are in a relatively static state. However, when the spray pipe 32 passes through the arc plate 10, the friction between the arc plate 10 and the roller 92 causes the roller 92 to rotate, and the roller 92 drives the slider 91 to rotate. At this time, the slider 91 rotates relative to the spray pipe 32, and then moves on the spray pipe 32. Similarly, during the entire operation process, the slider 91 and the roller 92 move up and down on the outside of the spray pipe 32, so as to scrape and clean the surface of the spray pipe 32.

[0057] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A flue gas desulfurization device for a boiler in a heating plant, comprising a desulfurization tower (1), wherein an air inlet (7) is arranged on one side of the bottom of the desulfurization tower (1), and an air outlet (8) is arranged on the top of the desulfurization tower (1), characterized in that: Also included are: A fixed frame (2) is fixedly arranged on the inner side of the desulfurization tower (1); A uniform speed spraying unit (3) is rotatably mounted on a fixed frame (2) and is capable of performing uniform speed rotational spraying in the desulfurization tower (1). A plurality of the uniform speed spraying units (3) are provided, and a speed reduction mechanism (4) is provided between two adjacent uniform speed spraying units (3); A driving assembly (5) is arranged on the fixed frame (2) and is used to drive the uniform speed spray unit (3) to rotate in the desulfurization tower (1); The gas distribution assembly (6) is arranged at the bottom of the fixing frame (2) and can evenly distribute the flue gas introduced by the air inlet (7) into the desulfurization tower (1).

2. The flue gas desulfurization device for boilers in heating plants according to claim 1 is characterized in that: The driving assembly (5) comprises a driving motor (51) arranged below the fixing frame (2); a driving shaft (52) is arranged at the output end of the driving motor (51); and a speed reduction mechanism (4) is also connected to the top of the driving shaft (52).

3. The flue gas desulfurization device for boilers in heating plants according to claim 2 is characterized in that: The uniform speed spray unit (3) comprises a plurality of rotating racks (31) rotatably arranged in a desulfurization tower (1), the axes of the rotation centers of the plurality of rotating racks (31) coincide with each other and are all located in the middle of the desulfurization tower (1), the lengths of the plurality of rotating racks (31) gradually increase from bottom to top, a spray pipe (32) is arranged at the end of the rotating rack (31), the spray pipe (32) is connected to an alkali solution circulation system, and a plurality of atomization holes (33) are opened on the outside of the spray pipe (32).

4. The flue gas desulfurization device for boilers in heating plants according to claim 3 is characterized in that: A plurality of atomization holes (33) are provided and arranged in a circular array on the outside of the spray pipe (32), and the atomization holes (33) are arranged obliquely on the spray pipe (32).

5. The flue gas desulfurization device for boilers in heating plants according to claim 4 is characterized in that: A plurality of gear rings (34) are fixedly arranged on the fixed frame (2), and a driven gear (35) meshing with the gear rings (34) is rotatably connected to the bottom of the spray pipe (32); when the rotating frame (31) drives the spray pipe (32) to rotate, the driven gear (35) meshes with the gear rings (34) to drive the spray pipe (32) to rotate.

6. The flue gas desulfurization device for boilers in heating plants according to claim 5 is characterized in that: The specifications of the driven gears (35) at the bottom of the plurality of spray pipes (32) are the same.

7. The flue gas desulfurization device for boilers in heating plants according to claim 6 is characterized in that: The speed reduction mechanism (4) comprises a plurality of support rods (41) fixedly arranged on a fixed frame (2), the ends of the support rods (41) are connected to a box body (42), a synchronous shaft (43) is rotatably arranged in the box body (42), a reduction gear 1 (44) and a reduction gear 2 (45) are rotatably arranged at the upper and lower ends of the synchronous shaft (43), and a transmission gear 1 (46) and a transmission gear 2 (47) are also rotatably arranged in the box body (42), and the transmission gear 1 (46) and the transmission gear 2 (47) are rotatably arranged in the box body (42). 7) are respectively meshed with a reduction gear 1 (44) and a reduction gear 2 (45); a rotating shaft (48) is provided on the rotating frame (31); a transmission gear 1 (46) and a transmission gear 2 (47) located between the two rotating frames (31) are respectively connected to the rotating shaft (48) on the upper and lower rotating frames (31); and a transmission gear 1 (46) and a transmission gear 2 (47) located between the rotating frame (31) and a driving shaft (52) are respectively connected to the rotating shaft (48) and the driving shaft (52).

8. The flue gas desulfurization device for boilers in heating plants according to claim 7 is characterized in that: The air distribution assembly (6) comprises a fixed shaft (61) rotatably arranged at the bottom of the fixed frame (2), blades (62) and a transmission bevel gear (63) are respectively arranged at both ends of the fixed shaft (61), and a driving bevel gear (64) meshing with the transmission bevel gear (63) is arranged on the outer side of the driving shaft (52).

9. The flue gas desulfurization device for boilers in heating plants according to claim 8, characterized in that: The spray pipe (32) is provided with a reciprocating thread on the outside, and a rolling unit (9) is sleeved on the thread on the outside of the spray pipe (32). An arc plate (10) is fixedly provided on the outside of the support rod (41). When the spray pipe (32) rotates and passes through the arc plate (10), the rolling unit (9) contacts the surface of the arc plate (10) and rolls, thereby moving outside the spray pipe (32).

10. The flue gas desulfurization device for boilers in heating plants according to claim 9, characterized in that: The rolling unit (9) comprises a slider (91) threadedly sleeved on the outside of the spray pipe (32), a roller (92) sleeved on the outside of the slider (91), a slide groove (93) opened on the outside of the slider (91), a connecting block (94) slidably arranged in the slide groove (93), the slider (91) is fixedly connected to the roller (92), and support springs (95) are arranged on the upper and lower sides of the slider (91), and the two ends of the support spring (95) are respectively fixedly connected to the slider (91) and the inner wall of the slide groove (93).

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