Coal feeding device for circulating fluidized bed boiler

Abstract

The utility model discloses a kind of circulating fluidized bed boiler coal feeding devices, it is related to the technical field of circulating fluidized bed boiler.The utility model includes outer tube, the outer surface of the outer tube is provided with drive assembly on one side, the inside of outer tube is provided with inner tube, the outer surface of inner tube is provided with limiting component, and rapping assembly is provided on limiting component, drive assembly transmission connection rapping assembly, the inside of outer tube is provided with buffer assembly, and inner tube is connected outer tube by buffer assembly, and the outer surface of outer tube is provided with coal spreading air duct on one side.The utility model is knocked by rapping stick inner tube, thereby vibration cleaning off the coal particle adhered in inner tube, when rapping and cleaning to inner tube, these vibrations are absorbed by second spring to prevent vibration transmission to outer tube, eliminate part of the vibration that inner tube transmits to outer tube, reduce the influence caused by vibration to the junction of outer tube and fluidized bed boiler, make it not easy to loosen, thereby protect the air tightness of fluidized bed boiler, improve the safety of fluidized bed boiler when using.

Description

TECHNICAL FIELD

[0001] The utility model belongs to circulating fluidized bed boiler technical field, specifically, especially related to a circulating fluidized bed boiler coal feeder. BACKGROUND

[0002] Circulating fluidized bed boiler can improve the combustion efficiency, and its fuel adaptability is strong, and some low calorific value coal can also be fully combusted, compared with other combustion modes, it can also effectively reduce the emission of sulfur dioxide, and it is relatively environmental protection to use, when using circulating fluidized bed boiler, a special coal feeder is needed, but due to coal raw materials or weather reasons, the water content of the coal may be too high, and then the coal block is easy to stick in the coal feeder and cause blockage, thereby affecting the normal use of the boiler and production efficiency.

[0003] Chinese patent CN204513372U discloses a circulating fluidized bed boiler coal feeder, which solves the problem of easy blockage of the coal falling pipe, which causes the boiler to frequently stop due to coal interruption, the technical scheme comprises a coal falling pipe and a coal chute connected in sequence, the upper section of the coal falling pipe has a bend pipe area, the coal falling pipe is provided with a vibrating device and an air supply device.

[0004] However, the vibrating device is fixed on the outer surface of the coal falling pipe during use, and the coal falling pipe will be impacted when vibrating, which may cause the connection between the coal falling pipe and the combustion chamber to be loose, thereby causing air leakage and affecting the oxygen composition, so that the combustion cannot reach the best combustion state, and the use efficiency of the boiler is affected.

[0005] However, the vibrating device is fixed on the outer surface of the coal falling pipe during use, and the coal falling pipe will be impacted when vibrating, which may cause the connection between the coal falling pipe and the combustion chamber to be loose, thereby causing air leakage and affecting the oxygen composition, so that the combustion cannot reach the best combustion state, and the use efficiency of the boiler is affected. UTILITY MODEL CONTENTS

[0006] In view of the problems in the related art, the utility model provides a circulating fluidized bed boiler coal feeder to overcome the above technical problems in the prior art.

[0007] To solve the above technical problems, the utility model is realized by the following technical scheme:

[0008] The utility model is a circulating fluidized bed boiler coal feeder, which comprises an outer pipe, a driving assembly is arranged on one side of the outer surface of the outer pipe, an inner pipe is arranged in the outer pipe, a limiting assembly is arranged on the outer surface of the inner pipe, a vibrating assembly is arranged on the limiting assembly, the driving assembly is connected with the vibrating assembly, a buffer assembly is arranged in the outer pipe, the inner pipe is connected with the outer pipe through the buffer assembly, and a coal blowing air duct is arranged on one side of the outer surface of the outer pipe.

[0009] One end of the outer tube is used to connect the outer surface of the fluidized bed boiler, the driving assembly is used to drive the shaking assembly, the shaking assembly cooperates with the limiting assembly to shake the inner tube, so as to remove the coal particles adhered to the inner wall of the inner tube, the limiting assembly is used for the buffering assembly to reduce the vibration of the inner tube transmitted to the outer tube, and the coal blowing duct is used to blow gas into the inner tube.

[0010] Further, the driving assembly comprises a driving cabinet, the driving cabinet is fixedly installed on one side of the outer surface of the outer tube, the outer surface of the driving cabinet is fixedly installed with a motor, the output end of the motor penetrates into the inside of the driving cabinet, the output end of the motor is fixedly installed with a first belt pulley, the first belt pulley is drivingly connected with a belt, and the first belt pulley is drivingly connected with the shaking assembly through the belt.

[0011] Further, the limiting assembly comprises a plate frame, the plate frame is fixedly installed on one side of the outer surface of the inner tube, U-shaped frames are fixedly installed at both ends of one side of the plate frame, limiting rods are arranged in the U-shaped frames, both ends of the limiting rods are slidingly connected in the U-shaped frames, one end of a rotating shaft is fixedly connected to one side of the plate frame, and the rotating shaft is hollow.

[0012] Further, the shaking assembly comprises a second belt pulley, the second belt pulley is rotatably installed on one side of the outer surface of the rotating shaft, the second belt pulley is drivingly connected with the first belt pulley through a belt, an annular wedge is fixedly installed on one side of the second belt pulley, one end of a first spring is fixedly connected to one end of the rotating shaft, the other end of the first spring is fixedly connected to one side of the limiting rod, one end of a shaking rod is further fixedly connected to the middle of one side of the limiting rod, the other end of the shaking rod is slidingly installed in the inside of the rotating shaft, and the shaking rod is arranged in the first spring, one end of the shaking rod is fixedly connected to one side of the limiting rod, one side of the annular wedge is slidingly connected to one side of the limiting rod, and the annular wedge and the limiting rod are closely attached.

[0013] Further, the buffering assembly comprises a plurality of second springs, the plurality of second springs are arranged in the inside of the outer tube, and both ends of the plurality of second springs are fixedly connected to the inner wall of the outer tube and the outer surface of the inner tube respectively.

[0014] Further, the buffering assembly further comprises a first bellows, one end of the first bellows is fixedly connected to one end in the inside of the outer tube, the other end of the first bellows is fixedly connected to one end of the inner tube, the inside of the outer tube is provided with a second bellows, one end of the second bellows is fixedly connected to one side of the outer surface of the inner tube, and the other end of the second bellows is fixedly connected to one end of the coal blowing duct.

[0015] Further, one end of the coal blowing duct penetrates through the outer tube and is connected to one end of the second bellows.

[0016] The utility model has the following beneficial effects:

[0017] 1, the utility model discloses a vibration cleaning coal particles adhered in the inner tube by the knocking of the vibration stick, when the inner tube is cleaned by vibration, the second spring is used to absorb the vibration and prevent the vibration from being transmitted to the outer tube, eliminate the vibration of the inner tube transmitted to the outer tube, reduce the influence of the vibration on the connection between the outer tube and the fluidized bed boiler, make it not easy to loosen, thereby protect the air tightness of the fluidized bed boiler, improve the safety of the fluidized bed boiler in use.

[0018] 2, the utility model discloses that the both ends of the first bellows are connected with one end of the inner tube and one end of the outer tube respectively, under the condition of not affecting the sealing property, the mobility between the outer tube and the inner tube is kept, and the both ends of the second bellows are connected with the inner tube and the coal spreading air duct respectively, under the condition of not affecting the sealing property, the mobility between the inner tube and the coal spreading air duct is kept.

[0019] Of course, any product implementing the utility model does not necessarily need to achieve all the advantages mentioned above. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for the ordinary skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0021] Figure 1 It is a three-dimensional structure schematic view of the utility model;

[0022] Figure 2 It is a three-dimensional structure schematic view of the utility model from the side view;

[0023] Figure 3 It is a part three-dimensional structure section schematic view of the utility model;

[0024] Figure 4 It is a three-dimensional structure schematic view of the utility model without containing the outer tube and the coal spreading air duct;

[0025] Figure 5 It is a three-dimensional structure schematic view of the utility model without containing the outer tube and the coal spreading air duct;

[0026] Figure 6 It is a three-dimensional structure schematic view of the utility model; Figure 5 It is an enlarged schematic view of the three-dimensional structure of A in the utility model;

[0027] In the drawings, the component list represented by each sign is as follows:

[0028] 1, outer tube; 2, drive assembly; 201, drive cabinet; 202, motor; 203, first pulley; 204, belt; 3, inner tube; 4, limiting assembly; 401, plate frame; 402, U-shaped frame; 403, rotating shaft; 404, limiting rod; 5, rapping assembly; 501, second pulley; 502, annular wedge; 503, first spring; 504, rapping rod; 6, buffer assembly; 601, second spring; 602, first bellows; 603, second bellows; 7, coal blowing air duct. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model protection.

[0030] In the description of the utility model, it should be understood that the terms "opening", "upper", "lower", "top", "middle", "inner" and the like indicate the orientation or positional relationship, which are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated components or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0031] Please refer to Figures 1-6 The utility model discloses a circulating fluidized bed boiler coal feeding device, including outer tube 1, the outer surface of outer tube 1 one side is provided with drive assembly 2, the inside of outer tube 1 is provided with inner tube 3, the outer surface of inner tube 3 is provided with limiting assembly 4, and rapping assembly 5 is arranged on limiting assembly 4, drive assembly 2 is transmission connection rapping assembly 5, the inside of outer tube 1 is provided with buffer assembly 6, and inner tube 3 is connected with outer tube 1 through buffer assembly 6, one side of the outer surface of outer tube 1 is provided with coal blowing air duct 7;

[0032] One end of outer tube 1 is used for connecting the outer surface of fluidized bed boiler, drive assembly 2 is used for driving rapping assembly 5, make rapping assembly 5 cooperate with limiting assembly 4 and rapping inner tube 3, to remove the coal particles adhered to the inner wall of inner tube 3, limiting assembly 4 is used for the buffer assembly 6 is used for reducing the vibration of inner tube 3 to outer tube 1, and coal blowing air duct 7 is used for blowing gas into inner tube 3.

[0033] In actual use, the driving assembly 2 is started to drive the beating assembly 5 to beat the inner tube 3, and the beating assembly 5 is limited by the limiting assembly 4, so that the inner tube 3 can be beaten at a certain frequency, and then the coal particles adhered in the inner tube 3 are cleaned by vibration, and at the same time of beating the inner tube 3, the buffering assembly 6 is connected between the inner tube 3 and the outer tube 1, so that part of the vibration of the inner tube 3 is eliminated by the buffering assembly 6, and then the coal particles in the inner tube 3 are blown into the bed layer of the fluidized bed boiler by the coal blowing duct 7.

[0034] The utility model discloses a beating assembly 5 beats the inner tube 3, and the buffering assembly 6 is connected between the inner tube 3 and the outer tube 1, and then part of the vibration of the inner tube 3 is eliminated by the buffering assembly 6, the influence of vibration on the connecting place of the outer tube 1 and the fluidized bed boiler is reduced, the outer tube 1 is not easy to loosen, and therefore the air tightness of the fluidized bed boiler is protected, and the safety of the fluidized bed boiler in use is improved.

[0035] In an embodiment, for the above-mentioned driving assembly 2, the driving assembly 2 comprises a driving cabinet 201, the driving cabinet 201 is fixedly installed on one side of the outer surface of the outer tube 1, a motor 202 is fixedly installed on the outer surface of the driving cabinet 201, the output end of the motor 202 penetrates into the inside of the driving cabinet 201, a first belt pulley 203 is fixedly installed on the output end of the motor 202, a belt 204 is drivingly connected on the first belt pulley 203, and the first belt pulley 203 is drivingly connected with the beating assembly 5 through the belt 204.

[0036] By starting the motor 202, the first belt pulley 203 fixedly installed on the output end is driven to rotate, so that the first belt pulley 203 drives the drivingly connected belt 204 to rotate, and then the beating assembly 5 is driven to run by the rotation of the belt 204.

[0037] In an embodiment, for the above-mentioned limiting assembly 4, the limiting assembly 4 comprises a plate frame 401, the plate frame 401 is fixedly installed on one side of the outer surface of the inner tube 3, U-shaped frames 402 are fixedly installed on both ends of one side of the plate frame 401, limiting rods 404 are arranged in the U-shaped frames 402, both ends of the limiting rods 404 are slidingly connected in the U-shaped frames 402, one end of a rotating shaft 403 is fixedly connected on one side of the plate frame 401, and the inside of the rotating shaft 403 is hollow.

[0038] The inside of the rotating shaft 403 is hollow, one end of the beating part of the beating assembly 5 beats the inner tube 3 by sliding in the rotating shaft 403, one end of the beating part is connected with the limiting rod 404, and the limiting rod 404 is slidingly installed at both ends in the U-shaped frame 402, so that the limiting rod 404 drives the beating part to move only along the direction of the U-shaped frame 402.

[0039] In one embodiment, for the above beating assembly 5, the beating assembly 5 comprises a second pulley 501, one side of the second pulley 501 is rotatably mounted on the outer surface of the rotating shaft 403, the second pulley 501 is drivingly connected with the first pulley 203 through the belt 204, one side of the second pulley 501 is fixedly mounted with an annular wedge block 502, one end of the rotating shaft 403 is fixedly connected with one end of a first spring 503, the other end of the first spring 503 is fixedly connected on one side of the limiting rod 404, the middle of one side of the limiting rod 404 is further fixedly connected with one end of a beating stick 504, the other end of the beating stick 504 is slidably mounted in the interior of the rotating shaft 403, and the beating stick 504 is arranged inside the first spring 503, one end of the beating stick 504 is fixedly connected with one side of the limiting rod 404, one side of the annular wedge block 502 is slidably connected with one side of the limiting rod 404, and the annular wedge block 502 and the limiting rod 404 are closely fitted.

[0040] The second pulley 501 is driven to rotate on the outer surface of the rotating shaft 403 through the belt 204, and then drives the annular wedge block 502 fixedly connected on one side to rotate, since the side of the annular wedge block 502 in contact with the limiting rod 404 is arc-shaped, and both ends of the limiting rod 404 are slidably mounted in the U-shaped frame 402 and can only move along the U-shaped frame 402, therefore, the rotation of the annular wedge block 502 will extrude the limiting rod 404 to move along the U-shaped frame 402 away from the annular wedge block 502, thereby driving the beating stick 504 and one end of the first spring 503 fixedly connected on one side to move upward, so that the first spring 503 is stretched and deformed to accumulate energy, when the gap in the middle of the annular wedge block 502 rotates to one side of the limiting rod 404, the first spring 503 restores deformation, thereby driving the limiting rod 404 fixedly connected on one side to quickly reset, and simultaneously driving the beating stick 504 fixedly connected on one side of the limiting rod 404 to knock the inner tube 3, so as to clean the coal particles adhered in the inner tube 3 through vibration.

[0041] In one embodiment, for the above buffer assembly 6, the buffer assembly 6 comprises a plurality of second springs 601, the second springs 601 are arranged in the interior of the outer tube 1, and both ends of the second springs 601 are fixedly connected on the inner wall of the outer tube 1 and the outer surface of the inner tube 3, respectively.

[0042] When the beating stick 504 knocks the inner tube 3, it will vibrate the inner tube 3, and the second springs 601 absorb these vibrations to prevent the vibrations from being transmitted to the outer tube 1, thereby reducing the vibration amplitude of the outer tube 1 and protecting the stability of the connection between the outer tube 1 and the fluidized bed boiler.

[0043] In one embodiment, for the above-mentioned buffer assembly 6, the buffer assembly 6 further comprises a first bellows 602, one end of the first bellows 602 is fixedly connected to one end inside the outer tube 1, the other end of the first bellows 602 is fixedly connected to one end of the inner tube 3, the inside of the outer tube 1 is provided with a second bellows 603, one end of the second bellows 603 is fixedly connected to one side of the outer surface of the inner tube 3, the other end of the second bellows 603 is fixedly connected to one end of the coal distributing duct 7.

[0044] By connecting the two ends of the first bellows 602 to one end inside the outer tube 1 and one end of the inner tube 3 respectively, the activity between the outer tube 1 and the inner tube 3 is retained without affecting the sealing property, by connecting the two ends of the second bellows 603 to the inner tube 3 and the coal distributing duct 7 respectively, the activity between the inner tube 3 and the coal distributing duct 7 is retained without affecting the sealing property.

[0045] In one embodiment, for the above-mentioned coal distributing duct 7, one end of the coal distributing duct 7 penetrates the outer tube 1 and is connected to one end of the second bellows 603.

[0046] By inputting airflow into the inner tube 3 through the coal distributing duct 7, the coal particles in the inner tube 3 are uniformly scattered on the bed layer of the fluidized bed boiler, thereby improving the combustion efficiency.

[0047] According to the technical scheme of the utility model, the motor 202 is started to drive the first pulley 203 fixedly installed at the output end to rotate, so that the first pulley 203 drives the belt 204 in transmission connection to rotate, then the second pulley 501 is driven to rotate on the outer surface of the rotating shaft 403 through the rotation of the belt 204, then the annular wedge block 502 fixedly connected on one side is driven to rotate, since the side of the annular wedge block 502 in contact with the limiting rod 404 is arc-shaped, and the two ends of the limiting rod 404 are slidingly installed in the U-shaped frame 402 and can only move along the U-shaped frame 402, therefore, the rotation of the annular wedge block 502 will extrude the limiting rod 404 to move along the U-shaped frame 402 away from the annular wedge block 502, then the side of the limiting rod 404 fixedly connected with the vibrating rod 504 and one end of the first spring 503 is driven to move upward, then the first spring 503 is stretched to accumulate energy, when the gap in the middle of the annular wedge block 502 rotates to one side of the limiting rod 404, the first spring 503 restores the deformation, then the one end of the limiting rod 404 fixedly connected with the vibrating rod 504 on one side is driven to reset quickly, and the vibrating rod 504 on one side of the limiting rod 404 fixedly connected with the vibrating rod 504 knocks the inner pipe 3, so that the coal particles adhered in the inner pipe 3 are cleaned through vibration, when the inner pipe 3 is vibrated and cleaned, the second spring 601 absorbs the vibration to prevent the vibration from being transmitted to the outer pipe 1, the two ends of the first corrugated pipe 602 are connected with one end of the outer pipe 1 and one end of the inner pipe 3 respectively, the mobility between the outer pipe 1 and the inner pipe 3 is reserved, the two ends of the second corrugated pipe 603 are connected with the inner pipe 3 and the coal feeding duct 7 respectively, and the mobility between the inner pipe 3 and the coal feeding duct 7 is reserved.

[0048] Through the above technical scheme, 1, the vibrating rod 504 knocks the inner pipe 3, so that the coal particles adhered in the inner pipe 3 are cleaned through vibration, when the inner pipe 3 is vibrated and cleaned, the second spring 601 absorbs the vibration to prevent the vibration from being transmitted to the outer pipe 1, part of the vibration of the inner pipe 3 is transmitted to the outer pipe 1, the influence of the vibration on the connection between the outer pipe 1 and the fluidized bed boiler is reduced, the connection is not easy to loosen, the air tightness of the fluidized bed boiler is protected, and the safety of the fluidized bed boiler in use is improved.

[0049] 2, the two ends of the first corrugated pipe 602 are connected with one end of the outer pipe 1 and one end of the inner pipe 3 respectively, the mobility between the outer pipe 1 and the inner pipe 3 is reserved without affecting the sealing property, the two ends of the second corrugated pipe 603 are connected with the inner pipe 3 and the coal feeding duct 7 respectively, and the mobility between the inner pipe 3 and the coal feeding duct 7 is reserved without affecting the sealing property.

[0050] In the description of the application, references to "one embodiment", "an example", "certain examples" etc. mean that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. The appearances of the phrases "in one embodiment", "an example" or "certain examples" in various places in the specification are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0051] The preferred embodiments of the application disclosed above are only used to help explain the application. The preferred embodiments do not describe all of the details of the application, nor limit the application to the specific embodiments described. Obviously, many modifications and variations of the application can be made in light of the teachings above. The embodiments are chosen and described in order to best explain the principles of the application and its practical application, to thereby enable others skilled in the art to best utilize the application. The application is merely exemplary and limited by the scope of the appended claims as well as the equivalents thereof.

Claims

1. A coal feeding device for a circulating fluidized bed boiler, comprising an outer pipe (1), characterized in that, A drive assembly (2) is provided on one side of the outer surface of the outer tube (1), an inner tube (3) is provided inside the outer tube (1), a limiting assembly (4) is provided on the outer surface of the inner tube (3), a vibrating assembly (5) is provided on the limiting assembly (4), the drive assembly (2) is connected to the vibrating assembly (5), a buffer assembly (6) is provided inside the outer tube (1), the inner tube (3) is connected to the outer tube (1) through the buffer assembly (6), and a coal spreading duct (7) is provided on one side of the outer surface of the outer tube (1). One end of the outer tube (1) is used to connect to the outer surface of the fluidized bed boiler. The driving component (2) is used to drive the rapping component (5) so that the rapping component (5) cooperates with the limiting component (4) to rap the inner tube (3) to remove the coal particles adhering to the inner wall of the inner tube (3). The limiting component (4) is used by the buffer component (6) to reduce the vibration transmitted from the inner tube (3) to the outer tube (1). The coal spreading duct (7) is used to blow gas into the inner tube (3).

2. The coal feeding device for a circulating fluidized bed boiler according to claim 1, characterized in that, The drive assembly (2) includes a drive cabinet (201), which is fixedly installed on one side of the outer surface of the outer tube (1). A motor (202) is fixedly installed on the outer surface of the drive cabinet (201). The output end of the motor (202) extends into the interior of the drive cabinet (201). A first pulley (203) is fixedly installed on the output end of the motor (202). A belt (204) is driven and connected to the first pulley (203). The first pulley (203) is driven and connected to the vibrating assembly (5) through the belt (204).

3. The coal feeding device for a circulating fluidized bed boiler according to claim 1, characterized in that, The limiting component (4) includes a plate frame (401), which is fixedly installed on one side of the outer surface of the inner tube (3). Both ends of one side of the plate frame (401) are fixedly installed with U-shaped frames (402). A limiting rod (404) is provided inside the U-shaped frame (402). Both ends of the limiting rod (404) are slidably connected inside the U-shaped frame (402). One end of a rotating shaft (403) is fixedly connected to one side of the plate frame (401). The rotating shaft (403) is hollow inside.

4. A coal feeding device for a circulating fluidized bed boiler according to claim 3, characterized in that, The vibrating assembly (5) includes a second pulley (501), one side of which is rotatably mounted on the outer surface of a rotating shaft (403). The second pulley (501) is connected to the first pulley (203) via a belt (204). An annular wedge (502) is fixedly mounted on one side of the second pulley (501). One end of the rotating shaft (403) is fixedly connected to one end of a first spring (503), and the other end of the first spring (503) is fixedly connected to a limiting rod (404). On one side, one end of a vibrating rod (504) is fixedly connected to the middle of one side of the limiting rod (404). The other end of the vibrating rod (504) is slidably installed inside the rotating shaft (403). The vibrating rod (504) is located inside the first spring (503). One end of the vibrating rod (504) is fixedly connected to one side of the limiting rod (404). One side of the annular wedge (502) is slidably connected to one side of the limiting rod (404). The annular wedge (502) and the limiting rod (404) are tightly fitted together.

5. A coal feeding device for a circulating fluidized bed boiler according to claim 1, characterized in that, The buffer assembly (6) includes several second springs (601), which are all disposed inside the outer tube (1). The two ends of the several second springs (601) are respectively fixedly connected to the inner wall of the outer tube (1) and the outer surface of the inner tube (3).

6. A coal feeding device for a circulating fluidized bed boiler according to claim 5, characterized in that, The buffer assembly (6) further includes a first corrugated pipe (602), one end of which is fixedly connected to one end inside the outer pipe (1), and the other end of which is fixedly connected to one end of the inner pipe (3). A second corrugated pipe (603) is provided inside the outer pipe (1), one end of which is fixedly connected to one side of the outer surface of the inner pipe (3), and the other end of which is fixedly connected to one end of the coal spreading ventilation duct (7).

7. A coal feeding device for a circulating fluidized bed boiler according to claim 6, characterized in that, One end of the coal-spreading ventilation duct (7) passes through the outer pipe (1) and is connected to one end of the second corrugated pipe (603).

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