Circulating fluidized bed boiler

Abstract

The invention belongs to the field of fluidized bed boilers, and particularly relates to a circulating fluidized bed boiler which comprises a hearth and a cyclone separator, the upper end of the left side of the hearth is communicated with an inclined outlet flue, the left side of the outlet flue is communicated with the cyclone separator, and the outlet flue is provided with a cleaning assembly used for cleaning accumulated dust in the outlet flue. When accumulated dust in the outlet flue is treated, the area of flue gas passing through the rectangular frame can be changed through the adjusting assembly, the flue gas is utilized to drive the rectangular frame to move in the outlet flue, then different positions in the outlet flue are purged through the spray head in the moving process, cleaning dead angles are reduced, and the cleaning efficiency is improved. A more comprehensive and sufficient cleaning effect is achieved; and meanwhile, the moving speed of the rectangular frame can be reasonably controlled for effective cleaning according to the specific working condition of the hearth, so that the inner wall of the outlet flue can be prevented from being abraded due to excessive cleaning, and the cleaning effect on accumulated ash in the outlet flue is further guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of fluidized bed boilers, in particular to circulating fluidized bed boilers. Background Art

[0002] A circulating fluidized bed boiler is a highly efficient and clean combustion system primarily used to burn solid fuels such as coal and biomass. Its core features are "fluidized combustion" and "particle circulation." This involves the fuel and bed material (such as sand and limestone) being lifted by airflow within the furnace, creating a fluid-like boiling state. This is then continuously circulated and burned by a cyclone separator, thereby improving combustion efficiency and reducing pollution.

[0003] During the combustion of granular coal in a circulating fluidized bed boiler, the fly ash concentration in the flue gas at the furnace outlet is relatively high. As the boiler operates for a longer period of time, ash is easily accumulated in the horizontal flue at the furnace outlet. In particular, when the flue gas flow rate decreases during boiler load reduction, the flue gas flow rate decreases accordingly, and a large amount of dust particles are deposited in the horizontal flue. Ash accumulation in the horizontal flue will reduce the flow area of the horizontal flue at the furnace outlet and increase the flue gas flow rate, thus affecting the separation efficiency of the cyclone separator.

[0004] At present, soot blowers are usually used to clean these accumulated dusts. However, the nozzle position on the soot blower is fixed. Even if it can blow at a certain angle, it is difficult to fully cover the entire inner surface of the horizontal pipe. There are likely to be cleaning dead corners, which affects the cleaning effect of the accumulated dust. Secondly, the severity of the accumulated dust in the horizontal pipe will be affected by many factors such as the type of fuel, combustion conditions and flue gas flow, which makes the accumulated dust unevenly distributed in the horizontal pipe. The fixed nozzle blowing method cannot provide greater blowing force or longer blowing time for areas with severe accumulated dust, and it is difficult to meet actual needs. Summary of the Invention

[0005] In view of the above problems, the circulating fluidized bed boiler provided in the embodiment of the present application can achieve a more comprehensive and sufficient cleaning effect on the ash accumulation in the outlet flue, and at the same time can perform local targeted cleaning to avoid excessive cleaning causing wear on the inner wall of the outlet flue.

[0006] In order to achieve the above-mentioned purpose, the embodiments of the present application provide the following technical solutions: The present invention provides a circulating fluidized bed boiler, comprising a furnace and a cyclone separator, wherein the upper left end of the furnace is connected to an inclined outlet flue, the left side of the outlet flue is connected to the cyclone separator, and the outlet flue is provided with a cleaning component for cleaning the accumulated dust therein.

[0007] The cleaning component includes a rectangular frame that is slidably arranged inside the outlet flue, a groove is opened on the left side of the interior of the rectangular frame, and an adjustment component is arranged in the groove for adjusting the flow area of the flue gas when it flows through the rectangular frame. The adjustment component includes two baffles that are slidably arranged in the groove and are symmetrically distributed up and down.

[0008] The upper right end of the cyclone separator is provided with a knocking assembly for knocking the outlet flue, the upper inner end of the cyclone separator is fixedly provided with an exhaust pipe, and the exhaust pipe is provided with a driving assembly that drives the knocking assembly to work intermittently.

[0009] The flue gas entering the outlet flue pushes the rectangular frame to move in the outlet flue, thereby cleaning the accumulated dust in the outlet flue. The accumulated dust in the outlet flue is partially cleaned by adjusting the component, and the accumulated dust in the outlet flue is further cleaned by the cooperation of the knocking component and the driving component.

[0010] According to a preferred embodiment, an air guide cavity is opened on the right side of the interior of the rectangular frame, and a plurality of nozzles connected to the air guide cavity for cleaning accumulated dust are arranged outside the rectangular frame, and the plurality of nozzles are evenly distributed outside the rectangular frame.

[0011] According to a favorable embodiment, an air pump is fixedly installed on the rear side of the outlet flue, and an air supply pipe is provided in communication with the air outlet end of the air pump. The end of the air supply pipe away from the air pump passes through the interior of the inlet and outlet flues and is connected with the air guide cavity. The air supply pipe is a hose.

[0012] According to an advantageous embodiment, a motor is fixedly arranged in the groove, a gear is fixedly arranged on the output shaft of the motor, a rack is fixedly arranged on the front side of the baffle, and both racks are engaged with the gear.

[0013] According to a favorable embodiment, the knocking assembly includes a mounting block fixedly arranged at the upper right end of the cyclone separator, a connecting rod is slidably arranged on the mounting block, the connecting rod passes through the mounting block and a knocking block located above the outlet flue is fixedly arranged at the bottom thereof, a connecting plate is fixedly arranged at the top of the connecting rod, and a roller 1 is fixedly arranged at the bottom of the connecting plate.

[0014] According to a favorable embodiment, the driving assembly includes a rotating rod rotatably arranged on the exhaust pipe, an impeller is fixedly arranged at the bottom of the rotating rod, the top of the rotating rod passes through the exhaust pipe and is fixedly provided with a disc, an arc ring used in conjunction with a roller is fixedly provided on the outer side of the disc, and an air guide pipe is connected to the left side of the exhaust pipe.

[0015] According to an advantageous embodiment, the arcuate ring is inclined on the outer side of the disc, the bottom of the first roller is in rolling contact with the upper part of the arcuate ring, and the front side of the arcuate ring is chamfered.

[0016] According to an advantageous embodiment, a plurality of limit blocks are provided inside the outlet flue, and a rubber pad is fixedly provided on one side of the limit block close to the rectangular frame, and the right side of the rectangular frame contacts the two rubber pads on the left side.

[0017] According to a favorable embodiment, roller 2 is fixedly provided at the four outer corners of the rectangular frame, and the side of roller 2 away from the rectangular frame is in rolling contact with the inner wall of the outlet flue, and the four corners of the inner wall of the outlet flue are chamfered for cooperating with roller 2.

[0018] According to a favorable embodiment, a returner is provided at the bottom of the cyclone separator, a return pipe is provided on the right side of the returner, the right end of the return pipe passes through the interior of the furnace, and a feed pipe is provided on the lower right side of the furnace.

[0019] Compared with the prior art, the circulating fluidized bed boiler provided by the embodiment of the present invention has the following beneficial effects:

[0020] 1. When the present invention processes the ash accumulation in the outlet flue, the area of the flue gas passing through the rectangular frame can be changed by adjusting the component, so that the flue gas can be used to drive the rectangular frame to move inside the outlet flue, and then the nozzle can be used to blow at different positions in the outlet flue during the movement, thereby reducing the cleaning dead angles and achieving a more comprehensive and sufficient cleaning effect; at the same time, according to the specific working conditions of the furnace, the moving speed of the rectangular frame can be reasonably controlled to carry out more reasonable and effective cleaning, which not only avoids the wear of the inner wall of the outlet flue caused by excessive cleaning, but also further ensures the cleaning effect of the ash accumulation in the outlet flue.

[0021] 2. The present invention is provided with a cleaning component and an adjustment component. The use position of the baffle can be adjusted by a motor, so that the flue gas can push the rectangular frame to move in the outlet flue. At this time, different positions in the outlet flue can be purged through the cooperation of the air pump and the nozzle, thereby ensuring the cleaning effect of the dust accumulated in the outlet flue.

[0022] 3. In the process of cleaning the accumulated dust in the outlet flue, the present invention can reasonably fine-tune the position of the baffle in a timely manner during the movement of the rectangular frame according to the specific working conditions and load of the furnace, change the moving speed of the rectangular frame, and reasonably adjust the cleaning time of the accumulated dust in the outlet flue. This can not only avoid the wear of the inner wall of the outlet flue caused by excessive cleaning, but also further ensure the cleaning effect of the outlet flue.

[0023] 4. The present invention is provided with a driving assembly and a knocking assembly. After the flue gas enters the interior of the exhaust pipe, the impeller can be used to drive the arc ring to rotate, and then the roller can be used to drive the knocking block to move up and down intermittently. Through this intermittent knocking action, the accumulated dust attached to the inner wall of the outlet flue can be effectively shaken off, the originally stubborn accumulated dust can be shaken loose, and the accumulated dust in the outlet flue can be further cleaned. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional structural diagram of the present invention.

[0025] Figure 2 It is a partial cross-sectional structural diagram of the present invention.

[0026] Figure 3 It is a cross-sectional structural diagram of the outlet flue in the present invention.

[0027] Figure 4 This is a cross-sectional structural diagram of the rectangular frame in the present invention from a first viewing angle.

[0028] Figure 5 This is a cross-sectional structural diagram of the rectangular frame in the present invention from a second viewing angle.

[0029] Figure 6 for Figure 5 A magnified view of the structure in part A.

[0030] Figure 7 It is a partial cross-sectional structural diagram of the cyclone separator in the present invention.

[0031] Figure 8 It is a three-dimensional structural diagram of the knocking component and part of the driving component in the present invention.

[0032] The accompanying drawings are as follows: 1. furnace; 2. cyclone separator; 3. outlet flue; 4. cleaning assembly; 41. rectangular frame; 42. air guide chamber; 43. nozzle; 44. air pump; 45. air supply pipe; 46. groove; 47. adjustment assembly; 471. baffle; 472. motor; 473. gear; 474. rack; 5. knocking assembly; 51. mounting block; 52. connecting rod; 53. knocking block; 54. connecting plate; 55. roller one; 6. exhaust pipe; 7. drive assembly; 71. rotating rod; 72. impeller; 73. disc; 74. arc ring; 8. limit block; 9. rubber pad; 10. roller two; 11. returner; 12. return pipe; 13. feed pipe; 14. air guide pipe. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1 - Figure 8 This application is described in further detail.

[0034] Please refer to Figure 1 and Figure 2 The circulating fluidized bed boiler includes a furnace 1 and a cyclone separator 2. The upper left end of the furnace 1 is connected to an inclined outlet flue 3. The left side of the outlet flue 3 is connected to the cyclone separator 2. The outlet flue 3 is provided with a cleaning component 4 for cleaning the ash accumulated therein.

[0035] See Figure 1 A return device 11 is provided at the bottom of the cyclone separator 2, and a return pipe 12 is provided on the right side of the return device 11. The right end of the return pipe 12 passes through the interior of the furnace 1, and a feed pipe 13 is provided on the lower right side of the furnace 1.

[0036] When the granular coal is burned, the granular coal enters the interior of the furnace 1 through the feed pipe 13, and then the flue gas after the granular coal is burned will enter the outlet flue 3. Then the cyclone separator 2 can be used to separate the particles in the flue gas. The separated particles enter the return pipe 12 through the return device 11, and finally re-enter the furnace 1 through the return pipe 12 for secondary combustion.

[0037] See Figure 3 and Figure 4 The cleaning component 4 includes a rectangular frame 41 slidably arranged inside the outlet flue 3, an air guide cavity 42 is opened on the right side of the interior of the rectangular frame 41, and a plurality of nozzles 43 connected to the air guide cavity 42 for cleaning the accumulated dust are arranged outside the rectangular frame 41, and the plurality of nozzles 43 are evenly distributed on the outside of the rectangular frame 41.

[0038] See Figure 3 and Figure 4 An air pump 44 is fixedly installed on the rear side of the outlet flue 3, and an air supply pipe 45 is provided at the air outlet end of the air pump 44. The end of the air supply pipe 45 away from the air pump 44 passes through the interior of the inlet and outlet flues 3 and is connected to the air guide cavity 42. The air supply pipe 45 is a hose.

[0039] When the interior of the outlet flue 3 needs to be cleaned, the air pump 44 works to supply air into the air guide cavity 42 through the air supply pipe 45. After the gas enters the interior of the air guide cavity 42, it is ejected through the nozzle 43, thereby cleaning the dust accumulated in the outlet flue 3.

[0040] See Figure 4 、 Figure 5 and Figure 6A groove 46 is formed on the left side of the interior of the rectangular frame 41. An adjustment assembly 47 for adjusting the flow area of smoke as it flows through the rectangular frame 41 is disposed within the groove 46. The adjustment assembly 47 includes two baffles 471 slidably disposed within the groove 46 and symmetrically distributed up and down. A motor 472 is fixedly disposed within the groove 46. A gear 473 is fixedly disposed on the output shaft of the motor 472. A rack 474 is fixedly disposed on the front side of the baffle 471, and both racks 474 mesh with the gear 473.

[0041] See Figure 3 A plurality of limit blocks 8 are provided inside the outlet flue 3 , and a rubber pad 9 is fixedly provided on one side of the limit block 8 close to the rectangular frame 41 , and the right side of the rectangular frame 41 is in contact with the two rubber pads 9 on the left side.

[0042] In order to ensure the cleaning effect of the dust accumulated in the outlet flue 3, the motor 472 can drive the gear 473 to rotate, and the rotation of the gear 473 can drive the two racks 474 to move toward each other, thereby driving the two baffles 471 to move closer to each other, so that the baffles 471 move out from the inside of the groove 46 and enter the inside of the rectangular frame 41. The baffles 471 can partially block the inside of the rectangular frame 41. When the flue gas in the furnace 1 enters the inside of the outlet flue 3, the space for the flue gas to pass through the rectangular frame 41 becomes smaller. At this time, the flow rate of the flue gas through the rectangular opening will be accelerated, and the increase in flow rate will lead to This causes an obvious pressure difference to be generated before and after the rectangular frame 41. This pressure difference can be used to push the rectangular frame 41 to move from right to left inside the outlet flue 3. During the movement of the rectangular frame 41, the nozzle 43 continues to spray gas to dynamically blow the inner wall of the outlet flue 3 to achieve dust cleaning. When the rectangular frame 41 contacts the rubber pad 9 on the left, the baffle 471 is reset by the motor 472. At this time, the flue gas flow area is restored and the pressure difference disappears. The rectangular frame 41 returns to its initial position under the action of gravity, completing the cleaning cycle, thereby greatly improving the cleaning effect of the outlet flue 3.

[0043] And during the cleaning process, when the furnace 1 is under high load and the combustion time is long, there may be relatively more ash accumulated in the outlet flue 3. At this time, the flue gas passage area can be appropriately increased by adjusting the use position of the baffle 471 to reduce the moving speed of the rectangular frame 41, extend the cleaning time in the entire outlet flue 3, and give the nozzle 43 more time to flush the ash, which is conducive to more thorough cleaning of the ash. On the contrary, when the furnace 1 is in a low-load operation state or has just completed a long cleaning operation, there is relatively less ash accumulated in the outlet flue 3. At this time, the flue gas passage area can be appropriately reduced, the moving speed of the rectangular frame 41 can be increased, and the cleaning time can be reduced. This can not only avoid excessive cleaning causing wear on the inner wall of the outlet flue 3, but also improve the cleaning efficiency, and can perform more reasonable and effective cleaning of the ash in the outlet flue 3, further ensuring the cleaning effect.

[0044] See Figure 3 Roller 2 10 is fixedly provided at the four outer corners of the rectangular frame 41 , and the side of roller 2 10 away from the rectangular frame 41 is in rolling contact with the inner wall of the outlet flue 3 , and the four corners of the inner wall of the outlet flue 3 are chamfered to cooperate with roller 2 10 .

[0045] When the rectangular frame 41 moves, it drives the roller 2 10 to roll at the chamfer inside the rectangular frame 41, which not only enables the rectangular frame 41 to move more smoothly in the flue, but also guides the movement of the rectangular frame 41, ensuring the stability of the rectangular frame 41 when moving.

[0046] See Figure 1 A knocking assembly 5 for knocking the outlet flue 3 is provided at the upper right end of the cyclone separator 2, and an exhaust pipe 6 is fixedly provided at the upper inner end of the cyclone separator 2. A driving assembly 7 for driving the knocking assembly 5 to perform intermittent work is provided on the exhaust pipe 6.

[0047] See Figure 7 The knocking assembly 5 includes a mounting block 51 fixedly arranged at the upper right end of the cyclone separator 2, a connecting rod 52 is slidably arranged on the mounting block 51, the connecting rod 52 passes through the mounting block 51 and a knocking block 53 located above the outlet flue 3 is fixedly arranged at the bottom of the connecting rod 52, a connecting plate 54 is fixedly arranged at the top of the connecting rod 52, and a roller 55 is fixedly arranged at the bottom of the connecting plate 54.

[0048] See Figure 1 and Figure 7The drive assembly 7 includes a rotating rod 71 rotatably mounted on the exhaust pipe 6. An impeller 72 is fixedly mounted at the bottom of the rotating rod 71. A disc 73 is fixedly mounted at the top of the rotating rod 71, extending through the exhaust pipe 6. An arcuate ring 74 is fixedly mounted on the outside of the disc 73, which cooperates with roller 1 55. The left side of the exhaust pipe 6 is connected to the air guide pipe 14. The arcuate ring 74 is inclined on the outside of the disc 73. The bottom of roller 1 55 rolls in contact with the top of the arcuate ring 74, and the front surface of the arcuate ring 74 is chamfered.

[0049] In order to further improve the cleaning effect of the dust accumulated in the outlet flue 3, after the flue gas in the outlet flue 3 enters the interior of the cyclone separator 2, the particles in the flue gas are thrown into the interior of the cyclone separator 2 under the action of centrifugal force and separated from the flue gas. Under the action of gravity, the particles slide along the inner wall of the cyclone separator 2 to the bottom end of the cyclone separator 2. The flue gas with the separated particles turns upward after reaching the bottom of the cyclone separator 2, rotates upward along the center of the cyclone separator 2 and enters the interior of the exhaust pipe 6, and is finally discharged through the air duct 14 for subsequent treatment.

[0050] When the smoke enters the exhaust pipe 6, it can drive the impeller 72 to rotate counterclockwise. The rotation of the impeller 72 can drive the disc 73 to rotate by means of the rotating rod 71. The rotation of the disc 73 can drive the connecting plate 54 to move up and down intermittently by means of the cooperation of the arc ring 74 and the roller 1 55. When the connecting plate 54 moves upward, the connecting rod 52 can drive the knocking block 53 to move away from the upper part of the outlet flue 3 (such as Figure 1 As shown), then when the arc ring 74 is separated from the roller 55, the support of the connecting plate 54 disappears, and the knocking block 53 moves downward to knock the upper part of the outlet flue 3 (as shown). Figure 8 As shown), the arc ring 74 rotates and contacts the roller 1 55 again, which can drive the knocking block 53 to move upward. Through this intermittent knocking action, the dust accumulated on the inner wall of the outlet flue 3 can be effectively shaken off, and the originally stubborn dust can be shaken loose. Combined with the purging effect of the gas sprayed by the nozzle 43 on the rectangular frame 41, the cleaning effect of the dust accumulated in the outlet flue 3 is further improved.

[0051] In specific operation, when it is necessary to clean the dust accumulated in the outlet flue 3, the motor 472 can be driven to rotate the gear 473. The rotation of the gear 473 can drive the two baffles 471 to move closer to each other through the rack 474, so that the baffles 471 can partially block the inner side of the rectangular frame 41. When the flue gas in the furnace 1 enters the interior of the outlet flue 3, the space for the flue gas to pass through the rectangular frame 41 becomes smaller. At this time, the flue gas can be used to push the rectangular frame 41 to move from right to left in the interior of the outlet flue 3. During the movement of the rectangular frame 41, the air pump 44 can supply air to the nozzle 43. The gas ejected by the nozzle 43 can clean the dust accumulated on the inner wall of the outlet flue 3. At the same time, by changing the use position of the baffle 471, during the cleaning process, not only can the wear of the inner wall of the outlet flue 3 caused by excessive cleaning be avoided, but the dust accumulated in the outlet flue 3 can be cleaned more reasonably and effectively, further ensuring the cleaning effect.

[0052] After the flue gas enters the cyclone separator 2 from the outlet flue 3 and is processed, the flue gas will be discharged through the exhaust pipe 6 and the air duct 14. After the flue gas enters the interior of the exhaust pipe 6, it will drive the impeller 72 to rotate, and then the cooperation of the arc ring 74 and the roller 55 can drive the knocking block 53 to move up and down intermittently. Through this intermittent knocking action, the accumulated dust attached to the inner wall of the outlet flue 3 can be effectively shaken off, the originally stubborn accumulated dust can be shaken loose, and the accumulated dust in the outlet flue 3 can be further cleaned.

[0053] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A circulating fluidized bed boiler comprising a furnace and a cyclone separator, wherein the left upper end of the furnace is connected to an inclined outlet flue, and the left side of the outlet flue is connected to the cyclone separator, characterized in that: The outlet flue is provided with a cleaning component for cleaning the dust accumulated therein; The cleaning assembly includes a rectangular frame slidably arranged inside the outlet flue, a groove is opened on the left side of the rectangular frame, and an adjustment assembly for adjusting the flow area of the flue gas when it flows through the rectangular frame is arranged in the groove, and the adjustment assembly includes two baffles slidably arranged in the groove and symmetrically distributed up and down; The upper right end of the cyclone separator is provided with a knocking assembly for knocking the outlet flue, and the upper inner end of the cyclone separator is fixedly provided with an exhaust pipe, and the exhaust pipe is provided with a driving assembly for driving the knocking assembly to work intermittently; The flue gas entering the outlet flue pushes the rectangular frame to move in the outlet flue, thereby cleaning the accumulated dust in the outlet flue. The accumulated dust in the outlet flue is partially cleaned by adjusting the component, and the accumulated dust in the outlet flue is further cleaned by the cooperation of the knocking component and the driving component.

2. The circulating fluidized bed boiler according to claim 1, characterized in that: An air guide cavity is opened on the right side of the interior of the rectangular frame, and a plurality of nozzles connected with the air guide cavity for cleaning accumulated dust are arranged outside the rectangular frame, and the plurality of nozzles are evenly distributed outside the rectangular frame.

3. The circulating fluidized bed boiler according to claim 2, characterized in that: An air pump is fixedly installed on the rear side of the outlet flue, and an air supply pipe is provided at the air outlet end of the air pump. The end of the air supply pipe away from the air pump passes through the interior of the inlet and outlet flues and is connected to the air guide cavity. The air supply pipe is a hose.

4. The circulating fluidized bed boiler according to claim 1, characterized in that: A motor is fixedly arranged in the groove, a gear is fixedly arranged on the output shaft of the motor, a rack is fixedly arranged on the front side of the baffle, and both racks are engaged with the gear.

5. The circulating fluidized bed boiler according to claim 1, characterized in that: The knocking assembly includes a mounting block fixedly arranged at the upper right end of the cyclone separator, a connecting rod is slidably arranged on the mounting block, the connecting rod passes through the mounting block and a knocking block located above the outlet flue is fixedly arranged at the bottom of the connecting rod, a connecting plate is fixedly arranged at the top of the connecting rod, and a roller is fixedly arranged at the bottom of the connecting plate.

6. The circulating fluidized bed boiler according to claim 5, characterized in that: The driving assembly includes a rotating rod rotatably arranged on the exhaust pipe, an impeller is fixedly arranged at the bottom of the rotating rod, the top of the rotating rod passes through the exhaust pipe and is fixedly provided with a disc, an arc ring used in conjunction with a roller is fixedly provided on the outer side of the disc, and an air guide pipe is connected to the left side of the exhaust pipe.

7. The circulating fluidized bed boiler according to claim 6, characterized in that: The arc ring is inclined on the outer side of the disc, the bottom of the roller 1 is in rolling contact with the upper part of the arc ring, and the front side of the arc ring is chamfered.

8. The circulating fluidized bed boiler according to claim 1, characterized in that: A plurality of limiting blocks are arranged inside the outlet flue, and a rubber pad is fixedly arranged on one side of the limiting block close to the rectangular frame, and the right side of the rectangular frame contacts the two rubber pads on the left side.

9. The circulating fluidized bed boiler according to claim 1, characterized in that: Roller 2 is fixedly provided at the four outer corners of the rectangular frame. The side of roller 2 away from the rectangular frame is in rolling contact with the inner wall of the outlet flue, and the four corners of the inner wall of the outlet flue are chamfered to cooperate with roller 2.

10. The circulating fluidized bed boiler according to claim 1, characterized in that: A return device is provided at the bottom of the cyclone separator, a return pipe is provided on the right side of the return device, the right end of the return pipe passes through the interior of the furnace, and a feed pipe is provided on the lower right side of the furnace.

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