Circulating fluidized bed boiler

Abstract

The present application belongs to the field of fluidized bed boiler, and particularly to a circulating fluidized bed boiler, which comprises a furnace and a cyclone separator, and an outlet flue in an inclined shape is connected to the upper end of the left side of the furnace, the left side of the outlet flue is communicated with the cyclone separator, and a cleaning assembly for cleaning the internal ash accumulation of the outlet flue is arranged on the outlet flue. When the ash accumulation in the outlet flue is treated, the area of the flue gas passing through the rectangular frame can be changed by adjusting the adjusting assembly, the rectangular frame is moved in the outlet flue by the flue gas, then different positions in the outlet flue are blown off in the moving process by the spray head, the cleaning dead angle is reduced, and more comprehensive and sufficient cleaning effect is achieved; meanwhile, the moving speed of the rectangular frame can be reasonably controlled for effective cleaning according to the specific working condition of the furnace, which not only can avoid the abrasion 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.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fluidized bed boilers, in particular to circulating fluidized bed boilers. BACKGROUND

[0002] Circulating fluidized bed boilers are efficient and clean combustion equipment, mainly used for burning coal, biomass and other solid fuels. Its core feature is "fluidized combustion" and "particle circulation", that is, fuel and bed material (such as sand, limestone) are blown up by the gas flow in the furnace, forming a boiling state similar to a fluid, and continuously circulating combustion under the action of the cyclone separator, thereby improving combustion efficiency and reducing pollution.

[0003] During the combustion of the circulating fluidized bed boiler on the particulate coal, the fly ash concentration in the flue gas at the furnace outlet is high, and as the operation time of the boiler increases, the horizontal flue at the furnace outlet is prone to ash deposition, especially during the boiler load reduction process, the flue gas flow decreases, and the flue gas flow rate decreases, a large number of dust particles in the horizontal flue are deposited, and after the horizontal flue is deposited, the flow area of the horizontal flue at the furnace outlet is reduced, the flue gas flow rate is increased, and the separation efficiency of the cyclone separator is affected.

[0004] Currently, when cleaning these accumulated ash, a soot blower is usually used for cleaning, but the nozzle position of the soot blower is fixed, and even if a certain angle of blowing can be achieved, it is difficult to fully cover the entire inner surface of the horizontal pipeline, and there may be cleaning dead angles, which affects the cleaning effect of the accumulated ash; secondly, the severity of the accumulated ash in the horizontal pipeline is affected by various factors such as fuel type, combustion condition and flue gas flow, so that the distribution of the accumulated ash in the horizontal pipeline is uneven, and the blowing method of the fixed nozzle cannot provide greater blowing intensity or longer blowing time in the area with severe accumulated ash, which is difficult to meet the actual demand. SUMMARY

[0005] In view of the above problems, the circulating fluidized bed boiler provided by the embodiments of the present application can achieve more comprehensive and sufficient cleaning effect of the accumulated ash in the outlet flue, and can also be locally targeted for cleaning to avoid excessive cleaning causing wear to the inner wall of the outlet flue.

[0006] In order to achieve the above purpose, the embodiments of the present application provide the following technical solutions: the present application provides a circulating fluidized bed boiler, comprising a furnace and a cyclone separator, an inclined outlet flue is communicated with the left upper end of the furnace, the left side of the outlet flue is communicated with the cyclone separator, and a cleaning assembly for cleaning the accumulated ash in the outlet flue is arranged on the outlet flue.

[0007] The cleaning assembly comprises a rectangular frame slidingly arranged inside the outlet flue, a groove is formed in the left side of the interior of the rectangular frame, an adjusting assembly for adjusting the flow area of flue gas flowing through the rectangular frame is arranged in the groove, and the adjusting assembly comprises two baffle plates symmetrically arranged up and down in the groove.

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

[0009] The rectangular frame is pushed to move in the outlet flue by the flue gas entering the outlet flue, thereby realizing cleaning of the accumulated ash in the outlet flue, the adjusting assembly is used to realize local cleaning of the accumulated ash in the outlet flue, and the knocking assembly and the driving assembly are used to further clean the accumulated ash in the outlet flue.

[0010] According to an advantageous embodiment, a gas guide cavity is formed in the right side of the interior of the rectangular frame, a plurality of nozzles for cleaning the accumulated ash and communicating with the gas guide cavity are arranged on the outside of the rectangular frame, and the plurality of nozzles are uniformly distributed on the outside of the rectangular frame.

[0011] According to an advantageous embodiment, a gas pump is fixedly installed on the rear side of the outlet flue, a gas outlet end of the gas pump is communicatively provided with a gas supply pipe, one end of the gas supply pipe away from the gas pump penetrates into the interior of the outlet flue and communicates with the gas guide cavity, and the gas supply pipe is a flexible pipe.

[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 plate, and the two racks are engaged with the gear.

[0013] According to an advantageous embodiment, the knocking assembly comprises a mounting block fixedly arranged at the right upper end of the cyclone separator, a connecting rod is slidingly arranged on the mounting block, the connecting rod penetrates through the mounting block and has a knocking block fixedly arranged at the bottom thereof above the outlet flue, a connecting plate is fixedly arranged at the top end of the connecting rod, and a first roller is fixedly arranged at the bottom of the connecting plate.

[0014] According to an advantageous embodiment, the driving assembly comprises a rotating rod rotatingly arranged on the exhaust pipe, a impeller is fixedly arranged at the bottom of the rotating rod, the top end of the rotating rod penetrates through the exhaust pipe and is fixedly provided with a disc, an arc-shaped ring cooperatively used with the first roller is fixedly arranged on the outside of the disc, and a gas guide pipe is communicatively arranged on the left side of the exhaust pipe.

[0015] According to an advantageous embodiment, the arc-shaped ring is inclined on the outside of the disc, the bottom of the first roller is in rolling contact with the upper part of the arc-shaped ring, and the front surface of the arc-shaped ring is chamfered.

[0016] According to an advantageous embodiment, the interior of the outlet flue is provided with a plurality of limiting blocks, and the limiting blocks are fixedly provided with rubber pads close to one side of the rectangular frame, and the right side of the rectangular frame is in contact with the two rubber pads located on the left side.

[0017] According to an advantageous embodiment, the outer side of the rectangular frame is fixedly provided with a plurality of rollers two at four corners, the side of the rollers two 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 provided with chamfers for cooperation with the rollers two.

[0018] According to an advantageous embodiment, the bottom of the cyclone separator is provided with a return feeder, the right side of the return feeder is in communication with a return pipe, the right end of the return pipe penetrates into the interior of the furnace, and the right lower end of the furnace is in communication with a feeding pipe.

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

[0020] 1、The present application can change the area of flue gas passing through the rectangular frame by adjusting the adjusting assembly when treating the accumulated ash in the outlet flue, so that the rectangular frame can be moved in the outlet flue by the flue gas, and then the different positions in the outlet flue can be blown by the nozzle during the movement, which reduces the cleaning dead angle and realizes more comprehensive and sufficient cleaning effect; at the same time, the moving speed of the rectangular frame can be reasonably controlled according to the specific working condition of the furnace to achieve more reasonable and effective cleaning, which not only avoids excessive cleaning to cause abrasion of the inner wall of the outlet flue, but also further ensures the cleaning effect of the accumulated ash in the outlet flue.

[0021] 2、The present application is provided with a cleaning assembly and an adjusting assembly, the use position of the baffle can be adjusted by the motor, so that the rectangular frame can be moved in the outlet flue by the flue gas, and then the different positions in the outlet flue can be blown by the cooperation of the air pump and the nozzle, which ensures the cleaning effect of the accumulated ash in the outlet flue.

[0022] 3、The present application can reasonably fine-tune the position of the baffle in the moving process of the rectangular frame according to the specific working condition and load of the furnace during the cleaning process of the accumulated ash in the outlet flue, which can change the moving speed of the rectangular frame, reasonably adjust the cleaning time of the accumulated ash in the outlet flue, not only avoid excessive cleaning to cause abrasion of the inner wall of the outlet flue, but also further ensure the cleaning effect of the outlet flue.

[0023] 4、The driving assembly and the knocking assembly are arranged in the application, after the flue gas enters the inside of the exhaust pipe, the arc-shaped ring can be driven to rotate by the impeller, then the knocking block can be intermittently moved up and down by the roller one, so that the accumulated ash adhered to the inner wall of the outlet flue can be effectively shaken off through the intermittent knocking action, the stubborn accumulated ash can be shaken loose, and the accumulated ash in the outlet flue can be further cleaned. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a perspective view of the application.

[0025] Figure 2 It is a partial sectional view of the application.

[0026] Figure 3 It is a sectional view of the outlet flue in the application.

[0027] Figure 4 It is a sectional view of the rectangular frame from the first perspective in the application.

[0028] Figure 5 It is a sectional view of the rectangular frame from the second perspective in the application.

[0029] Figure 6 It is Figure 5 An enlarged view of the structure of part A in the application.

[0030] Figure 7 It is a partial sectional view of the cyclone separator in the application.

[0031] Figure 8 It is a perspective view of the knocking assembly and part of the driving assembly in the application.

[0032] Reference signs in the drawings: 1, hearth; 2, cyclone separator; 3, outlet flue; 4, cleaning assembly; 41, rectangular frame; 42, air guide cavity; 43, nozzle; 44, air pump; 45, air supply pipe; 46, groove; 47, adjusting 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, driving assembly; 71, rotating rod; 72, impeller; 73, disc; 74, arc-shaped ring; 8, limiting block; 9, rubber pad; 10, roller two; 11, return feeder; 12, return pipe; 13, feed pipe; 14, air guide pipe. DETAILED DESCRIPTION

[0033] The following will be described in combination with the accompanying Figure 1 - Figure 8 The application will be further described in detail.

[0034] Please refer toFigure 1 and Figure 2 The circulating fluidized bed boiler comprises a furnace 1 and a cyclone separator 2, an outlet flue 3 in an inclined shape is arranged on the left upper end of the furnace 1 in communication, the left side of the outlet flue 3 is in communication with the cyclone separator 2, and a cleaning assembly 4 for cleaning the internal accumulated ash of the outlet flue 3 is arranged on the outlet flue 3.

[0035] Referring to Figure 1 The bottom of the cyclone separator 2 is provided with a return feeder 11, the right side of the return feeder 11 is arranged in communication with a return pipe 12, the right end of the return pipe 12 penetrates into the inside of the furnace 1, and the right lower end of the furnace 1 is arranged in communication with a feeding pipe 13.

[0036] When the granular coal is burned, the granular coal enters into the inside of the furnace 1 through the feeding pipe 13, then the flue gas after the granular coal is burned enters into the outlet flue 3, then the particles in the flue gas can be separated by the cyclone separator 2, the separated particles enter into the return pipe 12 through the return feeder 11, and finally the particles re-enter into the furnace 1 through the return pipe 12 for secondary combustion.

[0037] Referring to Figure 3 and Figure 4 The cleaning assembly 4 comprises a rectangular frame 41 which is arranged in sliding mode in the inside of the outlet flue 3, a gas guide cavity 42 is arranged on the right side in the inside of the rectangular frame 41, a plurality of nozzles 43 for cleaning the accumulated ash in communication with the gas guide cavity 42 are arranged on the outside of the rectangular frame 41, and the plurality of nozzles 43 are uniformly distributed on the outside of the rectangular frame 41.

[0038] Referring to Figure 3 and Figure 4 A gas pump 44 is fixedly installed on the rear side of the outlet flue 3, a gas supply pipe 45 in communication with the outlet end of the gas pump 44 is arranged, one end of the gas supply pipe 45 far away from the gas pump 44 penetrates into the inside of the outlet flue 3 and is in communication with the gas guide cavity 42, and the gas supply pipe 45 is a flexible pipe.

[0039] When the inside of the outlet flue 3 needs to be cleaned, the gas pump 44 works to supply gas into the gas guide cavity 42 through the gas supply pipe 45, the gas in the gas guide cavity 42 is sprayed out through the nozzles 43, so that the accumulated ash in the outlet flue 3 can be cleaned.

[0040] Referring to Figure 4 、 Figure 5 and Figure 6, the left side of the interior of the rectangular frame 41 is provided with a recess 46, the recess 46 is provided with an adjusting assembly 47 for adjusting the flow area of the flue gas flowing through the rectangular frame 41, the adjusting assembly 47 comprises two baffle plates 471 symmetrically distributed up and down slidingly arranged in the recess 46. The recess 46 is fixedly provided with a motor 472, a gear 473 is fixedly arranged on the output shaft of the motor 472, a rack 474 is fixedly arranged on the front side of the baffle plate 471, and the two racks 474 are engaged with the gear 473.

[0041] Referring to Figure 3 The interior of the outlet flue 3 is provided with a plurality of limiting blocks 8, and the limiting blocks 8 are fixedly provided with rubber pads 9 near one side of the rectangular frame 41, and the right side of the rectangular frame 41 is in contact with the two rubber pads 9 located on the left side.

[0042] In order to ensure the cleaning effect of the accumulated ash in the outlet flue 3, the motor 472 can drive the gear 473 to rotate, the gear 473 can drive the two racks 474 to move towards each other, thereby driving the two baffle plates 471 to move towards each other, so that the baffle plates 471 move out of the interior of the recess 46 and enter the interior of the rectangular frame 41, and the baffle plates 471 can partially block the interior of the rectangular frame 41. When the flue gas in the hearth 1 enters the interior of the outlet flue 3, the space of the rectangular frame 41 becomes smaller, so that the flow rate of the flue gas through the rectangular frame 41 increases, and the increase of the flow rate causes a significant pressure difference between the front and rear of the rectangular frame 41. The pressure difference can drive the rectangular frame 41 to move from right to left in the interior of the outlet flue 3, and the nozzle 43 continuously sprays gas during the movement of the rectangular frame 41, so that the interior wall of the outlet flue 3 is dynamically blown to realize the cleaning operation of the accumulated ash. When the rectangular frame 41 contacts the rubber pad 9 located on the left side, the baffle plates 471 are reset by the motor 472, at this time the flue gas flow area is restored, the pressure difference disappears, and then the rectangular frame 41 returns to the initial position under the action of gravity, and the cleaning cycle is completed, thereby greatly improving the cleaning effect of the outlet flue 3.

[0043] And in the process of cleaning, when the furnace 1 load is higher, the combustion time is longer, the outlet flue 3 may be relatively more, at this time, by adjusting the use position of the baffle 471, the flue gas passing area can be appropriately increased, the moving speed of the rectangular frame 41 is reduced, the cleaning time in the entire outlet flue 3 is prolonged, the nozzle 43 has more sufficient time to flush the accumulated ash, which is beneficial to more thoroughly clean the accumulated ash, on the contrary, when the furnace 1 is in a low load operation state or just after completing a long time cleaning operation, the outlet flue 3 is relatively less, at this time, the flue gas passing area is appropriately reduced, the moving speed of the rectangular frame 41 is increased, and the cleaning time is reduced, which not only can avoid the excessive cleaning to cause the wear of the inner wall of the outlet flue 3, but also can improve the cleaning efficiency, so that the accumulated ash in the outlet flue 3 can be more reasonably and effectively cleaned, and the cleaning effect is further ensured.

[0044] Referring to Figure 3 , the outer four corners of the rectangular frame 41 are fixedly provided with the second roller 10, the side of the second roller 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 provided with chamfers for cooperating with the second roller 10.

[0045] When the rectangular frame 41 moves, the second roller 10 rolls 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, thereby ensuring the stability of the rectangular frame 41 during movement.

[0046] Referring to Figure 1 , the right side upper end of the cyclone separator 2 is provided with a knocking assembly 5 for knocking the outlet flue 3, and the inner upper end of the cyclone separator 2 is fixedly provided with an exhaust pipe 6, and the exhaust pipe 6 is provided with a driving assembly 7 for driving the knocking assembly 5 to work intermittently.

[0047] Referring to Figure 7 , the knocking assembly 5 comprises a mounting block 51 fixedly arranged at the right side upper end of the cyclone separator 2, a connecting rod 52 slidably arranged on the mounting block 51, the connecting rod 52 penetrating through the mounting block 51 and having a knocking block 53 fixedly arranged at the bottom thereof above the outlet flue 3, a connecting plate 54 fixedly arranged at the top end of the connecting rod 52, and a first roller 55 fixedly arranged at the bottom of the connecting plate 54.

[0048] Referring to Figure 1 and Figure 7The driving assembly 7 comprises a rotating rod 71 arranged on the exhaust pipe 6, the bottom of the rotating rod 71 is fixedly provided with an impeller 72, the top end of the rotating rod 71 penetrates out of the exhaust pipe 6 and is fixedly provided with a disc 73, the outer side of the disc 73 is fixedly provided with an arc-shaped ring 74 used in cooperation with the roller one 55, and the left side of the exhaust pipe 6 is communicatively provided with the air guide pipe 14. The arc-shaped ring 74 is inclined on the outer side of the disc 73, the bottom of the roller one 55 is in rolling contact with the upper part of the arc-shaped ring 74, and the front surface of the arc-shaped ring 74 is provided in a chamfered manner.

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

[0050] When the flue gas enters the exhaust pipe 6, the impeller 72 can be driven to rotate counterclockwise, the rotation of the impeller 72 can drive the disc 73 to rotate through the rotating rod 71, the rotation of the disc 73 can drive the connecting plate 54 to move up and down intermittently through the cooperation of the arc-shaped ring 74 and the roller one 55, and when the connecting plate 54 moves upward, the knocking block 53 can be driven to move away from the upper part of the outlet flue 3 (as shown in Figure 1 When the arc-shaped ring 74 and the roller one 55 are separated, the support on the connecting plate 54 disappears at this time, and the knocking block 53 can knock the upper part of the outlet flue 3 by moving downward at this time (as shown in Figure 8 When the arc-shaped ring 74 and the roller one 55 are separated, the support on the connecting plate 54 disappears at this time, and the knocking block 53 can knock the upper part of the outlet flue 3 by moving downward at this time (as shown in

[0051] Specifically, when the accumulated ash in the outlet flue 3 needs to be cleaned, the motor 472 can drive the gear 473 to rotate, and the gear 473 can drive the two baffles 471 to move closer to each other through the rack 474, so that the inner side of the rectangular frame 41 can be partially blocked by the baffle 471. When the flue gas in the hearth 1 enters the inside of the outlet flue 3, the space of the rectangular frame 41 becomes smaller, and the flue gas can 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 air pump 44 can supply air to the nozzle 43, and the gas sprayed by the nozzle 43 can clean the accumulated ash on the inner wall of the outlet flue 3. At the same time, by changing the position of the baffle 471, the cleaning process can not only avoid excessive cleaning of the inner wall of the outlet flue 3, but also more reasonably and effectively clean the accumulated ash in the outlet flue 3, further ensuring the cleaning effect.

[0052] When the flue gas enters the cyclone separator 2 after being processed from the outlet flue 3, the flue gas is discharged through the exhaust pipe 6 and the air guide pipe 14. When the flue gas enters the inside of the exhaust pipe 6, it drives the impeller 72 to rotate, and then through the cooperation of the arc-shaped ring 74 and the roller 55, the knocking block 53 can move up and down intermittently, so that through this intermittent knocking action, the accumulated ash adhering to the inner wall of the outlet flue 3 can be effectively shaken off, and the originally stubborn accumulated ash can be loosened, thereby further cleaning the accumulated ash in the outlet flue 3.

[0053] The above is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, as described in the specification and drawings of the present application, are also included in the patent protection scope of the present application.

Claims

1. A circulating fluidized bed boiler comprising a furnace and a cyclone separator, the left upper end of the furnace is provided with an outlet flue in an inclined manner, the left side of the outlet flue is communicated with the cyclone separator, characterized in that: The cleaning assembly is arranged on the outlet flue to clean the dust accumulated in the outlet flue. The cleaning assembly comprises a rectangular frame slidingly arranged in the outlet flue, a groove is formed in the left side of the interior of the rectangular frame, an adjusting assembly for adjusting the flow area of flue gas flowing through the rectangular frame is arranged in the groove, and the adjusting assembly comprises two baffles symmetrically arranged in the groove. A motor is fixedly arranged in the groove, a gear is fixedly arranged on the output shaft of the motor, and a rack is fixedly arranged on the front side of the baffle. Two rollers are fixedly arranged at the four corners of the outer side of the rectangular frame, the side of the roller 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 arranged in an inverted angle to cooperate with the rollers. The adjusting assembly can change the area of flue gas passing through the rectangular frame, and the rectangular frame is driven by flue gas to move in the outlet flue. A gas guide cavity is formed in the right side of the interior of the rectangular frame, a plurality of nozzles for cleaning dust are arranged on the outer side of the rectangular frame and communicated with the gas guide cavity, and the plurality of nozzles are uniformly distributed on the outer side of the rectangular frame. A knocking assembly for knocking the outlet flue is arranged at the upper end of the right side of the cyclone separator, and an exhaust pipe is fixedly arranged at the upper end of the interior of the cyclone separator. The flue gas entering the outlet flue drives the rectangular frame to move in the outlet flue, thereby cleaning the dust accumulated in the outlet flue.

2. A circulating fluidized bed boiler according to claim 1, characterized in that The adjusting assembly can realize local cleaning of the dust accumulated in the outlet flue, and the cooperation of the knocking assembly and the driving assembly can further clean the dust accumulated in the outlet flue.

3. A circulating fluidized bed boiler according to claim 1, characterized in that A gas pump is fixedly arranged at the rear side of the outlet flue, a gas supply pipe is communicated with the outlet of the gas pump, one end of the gas supply pipe away from the gas pump penetrates into the interior of the outlet flue and is communicated with the gas guide cavity, and the gas supply pipe is a flexible pipe.

4. A circulating fluidized bed boiler according to claim 3, characterized in that The knocking assembly comprises a mounting block fixedly arranged at the upper end of the right side of the cyclone separator, a connecting rod slidingly arranged on the mounting block, the connecting rod penetrating through the mounting block and having a knocking block fixedly arranged at the bottom thereof above the outlet flue, a connecting plate fixedly arranged at the top end of the connecting rod, and a roller fixedly arranged at the bottom of the connecting plate.

5. A circulating fluidized bed boiler according to claim 4, characterized in that The driving assembly comprises a rotating rod rotatingly arranged on the exhaust pipe, a impeller fixedly arranged at the bottom of the rotating rod, a disc penetrating through the exhaust pipe and fixedly arranged at the top end of the rotating rod, an arc-shaped ring fixedly arranged at the outer side of the disc and cooperating with the roller, and a gas guide pipe communicated with the left side of the exhaust pipe.

6. A circulating fluidized bed boiler according to claim 1, characterized in that The arc-shaped ring is inclined at the outer side of the disc, the bottom of the roller is in rolling contact with the upper part of the arc-shaped ring, and the front side of the arc-shaped ring is arranged in an inverted angle.

7. A circulating fluidized bed boiler according to claim 1, characterized in that A plurality of limiting blocks are arranged in the interior of the outlet flue, rubber pads are fixedly arranged at the side of the limiting blocks close to the rectangular frame, and the right side of the rectangular frame is in contact with the two rubber pads arranged at the left side. A return feeder is arranged at the bottom of the cyclone separator, a return pipe is communicated with the right side of the return feeder, the right end of the return pipe penetrates into the interior of the furnace chamber, and a feeding pipe is communicated with the right lower end of the furnace chamber.

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