Tail flue device of circulating fluidized bed boiler

Abstract

The utility model relates to the technical field of fluidized bed boilers, and discloses a tail flue device of a circulating fluidized bed boiler, which comprises a hollow ventilation shell with openings on the upper side and the lower side, the inside of the ventilation shell is connected with a hollow shell body through a fixing plate, the shell body is annular, the inside of the shell body is rotatably connected with a connecting plate, and a space is reserved between the connecting plate and the upper inner wall of the shell body. An air outlet pipe is arranged on the lower side of the connecting plate, air is pumped into the air inlet pipe through the air outlet pipe, the connecting plate and other structures, air enters the air outlet pipe and is blown out from an air outlet nozzle, and therefore dust on the inner wall of the ventilation shell is blown off. Compared with the prior art, the air outlet nozzle can rotate around the axis of the connecting plate while blowing air, so that blown air is in uniform contact with the inner wall of the ventilation shell, and the dust removal effect is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of fluidized bed boilers, in particular to a tail flue device of a circulating fluidized bed boiler. Background Art

[0002] The circulating fluidized bed boiler adopts fluidized combustion. Its main structure includes two parts: the combustion chamber and the circulating furnace. The hot flue gas after fuel combustion flows through the furnace, slag-condensing tube bundle, superheater, economizer and air preheater in sequence, and then passes through the dust removal device to remove the fly ash, and finally discharged into the atmosphere from the chimney.

[0003] The existing tail flue device can blow away the dust remaining in the flue. For example, Chinese patent application No. CN202020890763.9 discloses a soot blowing device for the tail flue of a circulating fluidized bed boiler, including a pipe, one end of the top outer wall of the pipe is provided with exhaust holes distributed at equal distances, and a wind shield inclined plate is welded on the inner wall of the bottom of the pipe, a water cooling pipe is laid on the inner wall of the bottom of the pipe, and the water inlet end of the water cooling pipe is connected to the water outlet end of a high-pressure water pump through a water inlet pipe, and the water inlet end of the high-pressure water pump is connected to a water tank through a water outlet pipe.

[0004] The exhaust hole of this device is located on one side of the pipe, and the pipe cannot rotate, so that the wind blown out of the exhaust hole can only contact one side of the inner wall of the flue, making it difficult for the device to perform dust removal operations on other sides of the inner wall of the flue. Utility Model Content

[0005] In view of the shortcomings of the prior art, the utility model provides a circulating fluidized bed boiler tail flue device, which solves the problem that the blown wind can only contact one side of the inner wall of the flue.

[0006] To achieve the above objectives, the utility model is implemented through the following technical solutions: a circulating fluidized bed boiler tail flue device, comprising a hollow ventilation shell with openings on the upper and lower sides, the interior of the ventilation shell is connected to a hollow shell through a fixed plate, the shell is annular, and a connecting plate is rotatably connected to the inside of the shell, a space is left between the connecting plate and the upper inner wall of the shell, an air outlet pipe is provided on the lower side of the connecting plate, the upper end of the air outlet pipe passes through the connecting plate and is flush with the upper surface of the connecting plate, the air outlet pipe is connected to a plurality of air outlet nozzles on the side close to the ventilation shell, the axis of the air outlet nozzle forms an angle of 10 degrees to 90 degrees with the ventilation shell, a through groove compatible with the air outlet pipe is penetrated on the lower side of the shell, the through groove is annular, the outer surface of the shell is connected to an air inlet pipe, the air inlet pipe passes through the ventilation shell at one end away from the shell and is connected to an air pump, and the other end of the air inlet pipe is connected to the space between the connecting plate and the shell.

[0007] Preferably, the upper surface of the shell is rotatably connected to a rotating plate, the rotating plate is annular and has a limiting ring on the inner side, fan blades are installed on the inner side of the limiting ring, the lower surface of the rotating plate is connected to the connecting plate through a connecting rod, and the upper surface of the shell is provided with a groove adapted to the connecting rod.

[0008] Preferably, a scraper is provided on the upper surface of the fixed plate close to the shell, and the scraper is in contact with the upper surface of the rotating plate.

[0009] Preferably, the air outlet pipe and the side wall of the ventilation shell have the same inclination angle.

[0010] Preferably, a protrusion is connected to the upper surface at the center of the fan blade.

[0011] Preferably, the fixing plate is made of stainless steel.

[0012] The utility model provides a circulating fluidized bed boiler tail flue device, which has the following beneficial effects:

[0013] Through the arranged air outlet pipe, connecting plate and other structures, the air pump pumps air into the air inlet pipe, and the wind enters the air outlet pipe and is blown out from the air outlet nozzle, thereby blowing off the dust on the inner wall of the ventilation shell. Since an angle is formed between the axis of the air outlet nozzle and the ventilation shell, the air outlet nozzle pushes the air outlet pipe and the connecting plate to rotate when blowing air. Compared with the prior art, the air outlet nozzle can rotate around the axis of the connecting plate while blowing air, so that the blown air is in uniform contact with the inner wall of the ventilation shell, ensuring the dust removal effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the internal structure of the ventilation shell of the utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the rotating plate of the utility model;

[0017] Figure 4 This is a schematic diagram of the internal structure of the housing of the utility model;

[0018] Figure 5 This is a schematic diagram of the through slot structure of the utility model.

[0019] In the figure: 1. ventilation shell; 2. shell; 3. connecting plate; 4. air outlet pipe; 5. air outlet nozzle; 6. through groove; 7. air inlet pipe; 8. rotating plate; 9. limiting ring; 10. fan blade; 11. slot; 12. fixing plate; 13. scraper; 14. bump. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-5 The utility model provides a technical solution: a flue device at the tail end of a circulating fluidized bed boiler, comprising a hollow ventilation shell 1 with openings on the upper and lower sides. The interior of the ventilation shell 1 is connected to a hollow shell body 2 through a fixing plate 12. The shell body 2 is annular, and a connecting plate 3 is rotatably connected to the shell body 2. A space is left between the connecting plate 3 and the upper inner wall of the shell body 2. An air outlet pipe 4 is arranged on the lower side of the connecting plate 3. The upper end of the air outlet pipe 4 passes through the connecting plate 3 and is highly flush with the upper surface of the connecting plate 3. The air outlet pipe 4 is connected to a plurality of air outlet nozzles 5 on the side close to the ventilation shell 1. The axis of the air outlet nozzle 5 forms an angle of 10 degrees to 90 degrees with the ventilation shell 1. A through groove 6 adapted to the air outlet pipe 4 is penetrated and opened on the lower side of the shell body 2. The through groove 6 is annular, and an air inlet pipe 7 is connected to the outer surface of the shell body 2. The air inlet pipe 7 passes through the ventilation shell 1 at one end away from the shell body 2 and is connected to an air pump. The other end of the air inlet pipe 7 is connected to the space between the connecting plate 3 and the shell body 2, and the shell body 2 is slidably connected to the inner wall of the through groove 6.

[0022] During operation, the air pump pumps air into the air inlet pipe 7, the wind will enter the space between the connecting plate 3 and the shell 2, and then enter the air outlet pipe 4, and the wind will be blown toward the inner wall of the ventilation shell 1 through multiple air outlet nozzles 5, thereby blowing off the dust. Since an angle is formed between the axis of the air outlet nozzle 5 and the ventilation shell 1, the air outlet nozzle 5 will push the air outlet pipe 4 and the connecting plate 3 to rotate while blowing air, so that the blown air will evenly contact the inner wall of the ventilation shell 1 to ensure the dust removal effect.

[0023] See also Figure 1-5 The utility model provides a technical solution: a rotating plate 8 is rotatably connected to the upper surface of the shell 2, the rotating plate 8 is annular and has a limiting ring 9 on the inner side, a fan blade 10 is installed on the inner side of the limiting ring 9, the lower surface of the rotating plate 8 is connected to the connecting plate 3 through a connecting rod, and a groove 11 adapted to the connecting rod is opened on the upper surface of the shell 2.

[0024] During operation, the wind carrying smoke and dust discharged by the boiler moves downward from the top of the ventilation shell 1, and the wind will contact the fan blades 10, so that the fan blades 10 drive the limit ring 9, the rotating plate 8, and the connecting plate 3 to rotate, so that the connecting plate 3 drives the air outlet pipe 4 to rotate.

[0025] See also Figure 1-5 The utility model provides a technical solution: a scraper 13 is provided on the upper surface of the fixed plate 12 close to the shell 2, and the scraper 13 is in contact with the upper surface of the rotating plate 8.

[0026] During operation, the scraper 13 can be used to scrape off the dust on the upper surface of the rotating plate 8 .

[0027] See also Figure 1-5 The utility model provides a technical solution: the air outlet pipe 4 and the side wall of the ventilation shell 1 have the same inclination angle.

[0028] During operation, the air outlet pipe 4 and the side wall of the ventilation shell 1 have the same inclination angle, so that the air blown out by the air outlet nozzle 5 can evenly contact the inner wall of the ventilation shell 1 .

[0029] See also Figure 1-5 The utility model provides a technical solution: a protrusion 14 is connected to the upper surface of the center of the fan blade 10, and the protrusion 14 is conical.

[0030] During operation, the protrusion 14 can guide the wind carrying smoke and dust, thereby reducing the blocking effect of the center of the fan blade 10 on the wind.

[0031] See also Figure 1-5 The utility model provides a technical solution: the fixing plate 12 is made of stainless steel.

[0032] When working, the fixing plate 12 made of stainless steel has good corrosion resistance and strength, which is conducive to the use of the device in the environment inside the flue.

[0033] In summary, the air pump pumps air into the air inlet pipe 7, the wind will enter the space between the connecting plate 3 and the shell 2, and then enter the air outlet pipe 4, the wind will be blown to the inner wall of the ventilation shell 1 through multiple air outlet nozzles 5, so as to blow off the dust. Since an angle is formed between the axis of the air outlet nozzle 5 and the ventilation shell 1, the air outlet nozzle 5 will push the air outlet pipe 4 and the connecting plate 3 to rotate while blowing air, so that the blown wind will contact the inner wall of the ventilation shell 1 evenly to ensure the dust removal effect. The wind carrying smoke and dust discharged by the boiler moves from the top of the ventilation shell 1 to the bottom, and the wind will contact the fan blades 10, so that the fan blades 10 drive the limit ring 9, the rotating plate 8, and the connecting plate 3 to rotate, so that the connecting plate 3 can drive the air outlet pipe 4 to rotate.

[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A circulating fluidized bed boiler tail flue device, comprising a hollow ventilation shell (1) with upper and lower openings, characterized in that: The interior of the ventilation shell (1) is connected to a hollow shell (2) via a fixing plate (12); the shell (2) is annular; a connecting plate (3) is rotatably connected to the interior of the shell (2); a space is left between the connecting plate (3) and the upper inner wall of the shell (2); an air outlet pipe (4) is provided on the lower side of the connecting plate (3); the upper end of the air outlet pipe (4) passes through the connecting plate (3) and is flush with the upper surface of the connecting plate (3); the air outlet pipe (4) is connected to a side of the ventilation shell (1) close to the side of the ventilation shell (1). A plurality of air outlet nozzles (5), wherein the axis of the air outlet nozzles (5) forms an angle of 10 to 90 degrees with the ventilation shell (1); a through slot (6) adapted to the air outlet pipe (4) is provided through the lower side of the shell (2); the through slot (6) is annular; an air inlet pipe (7) is connected to the outer surface of the shell (2); one end of the air inlet pipe (7) away from the shell (2) passes through the ventilation shell (1) and is connected to an air pump; the other end of the air inlet pipe (7) is connected to the space between the connection plate (3) and the shell (2).

2. The circulating fluidized bed boiler tail flue device according to claim 1, characterized in that: The upper surface of the shell (2) is rotatably connected to a rotating plate (8), the rotating plate (8) is annular and is provided with a limiting ring (9) on the inner side, a fan blade (10) is installed on the inner side of the limiting ring (9), the lower surface of the rotating plate (8) is connected to the connecting plate (3) via a connecting rod, and the upper surface of the shell (2) is provided with a slot (11) adapted to the connecting rod.

3. The tail flue device of the circulating fluidized bed boiler according to claim 1, characterized in that: A scraper (13) is provided on the upper surface of the fixed plate (12) close to the shell (2), and the scraper (13) is in contact with the upper surface of the rotating plate (8).

4. The tail flue device of the circulating fluidized bed boiler according to claim 1, characterized in that: The air outlet pipe (4) and the side wall of the ventilation shell (1) have the same inclination angle.

5. The tail flue device of the circulating fluidized bed boiler according to claim 2, characterized in that: A convex block (14) is connected to the upper surface at the center of the fan blade (10).

6. The tail flue device of the circulating fluidized bed boiler according to claim 3, characterized in that: The fixing plate (12) is made of stainless steel.

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