Discharging device of circulating fluidized bed boiler

Abstract

The invention discloses a discharging device of a circulating fluidized bed boiler. The discharging device comprises the circulating fluidized bed boiler, a lime feeding bin and a feeding pipe. The feeding pipe comprises a first connecting pipe, a second connecting pipe and a rotatable main pipe body, and the main pipe body is coaxially connected between the two connecting pipes. A scraper abutting against the inner wall of the main pipe body is arranged on the inner wall of the first connecting pipe, and the driving mechanism drives the main pipe body to rotate to achieve continuous scraping. The vibration mechanism comprises a protruding block arranged on the outer wall of the main pipe body and an elastic knocking rod fixed to the second connecting pipe. When the main pipe body rotates, the protruding block periodically jacks up the knocking head to generate vibration. Annular inclined blowing holes are formed in the inner wall of the second connecting pipe, and an air curtain isolation layer is formed through air supply of an air pipe. According to the scheme, through the synergistic effect of rotary scraping, passive vibration and air curtain isolation, the problems of adhesion and blocking of limestone particles in the conveying process are effectively solved, and smooth discharging is ensured.

Description

Technical Field

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

[0002] Circulating fluidized bed (CFB) boilers are widely used in coal-fired power plants and industrial heating due to their wide fuel adaptability, high combustion efficiency, and low in-furnace desulfurization costs. In a typical CFB boiler system, the high-temperature gas-solid mixture exiting the furnace first enters a cyclone dust collector. The separated solid particles then return to the furnace via a return feeder for continued combustion, forming a material cycle. To remove SO₂ from the flue gas, limestone (CaCO₃) is typically continuously fed into the furnace. This decomposes at high temperatures to form CaO, which reacts with SO₂ to form calcium sulfate (CaSO₄), which is ultimately discharged as slag. The limestone's particle size, flow stability, and feed continuity directly impact desulfurization efficiency and boiler operational reliability.

[0003] In existing technology, limestone is typically stored in a limestone silo as fine powder particles and then fed directly into the furnace through a feed pipe. However, due to its strong hygroscopicity, limestone powder easily absorbs moisture from flue gas or ambient air, causing the particles to deliquesce and adhere to each other, forming large clumps. Furthermore, limestone raw materials often contain small amounts of clay and organic impurities, which soften at high temperatures and further adhere to the powder to form hard lumps. This phenomenon frequently causes limestone to "bridge," "block," or even "get stuck" in the feed pipe. In severe cases, this can cause the desulfurizer to interrupt production, necessitating optimization and improvement. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a circulating fluidized bed boiler unloading device.

[0005] The technical solution of the present invention is as follows: a circulating fluidized bed boiler unloading device, comprising a circulating fluidized bed boiler, a cyclone dust collector, a returner, a lime feed bin, and a feed pipe, wherein the circulating fluidized bed boiler is connected to the cyclone dust collector, the returner is provided at the bottom of the cyclone dust collector, the returner is connected to the circulating fluidized bed boiler, and the lime feed bin is connected to the circulating fluidized bed boiler via the feed pipe, characterized in that the feed pipe comprises: a first connecting pipe, a second connecting pipe, a main body, a scraper, a driving mechanism, a vibrating mechanism, and an air curtain purge mechanism;

[0006] The first connecting pipe is connected to the lime feeding bin, the second connecting pipe is connected to the circulating fluidized bed boiler, the main pipe is coaxially connected between the first connecting pipe and the second connecting pipe, and the main pipe can rotate around its own axis;

[0007] A scraper is fixed on the inner wall of the first connecting pipe, the scraper extends into the main body and extends to an end of the main body close to the second connecting pipe, the scraper abuts against the inner wall of the main body, and the driving mechanism is connected to the main body to drive the main body to rotate circumferentially;

[0008] The vibration mechanism includes a knocking rod, a knocking head and a bump. The bump is provided on the outer peripheral wall of the main body. The knocking rod is an elastic rod. One end of the knocking rod is fixedly connected to the second connecting pipe, and the other end is fixedly provided with the knocking head. When the main body rotates, the knocking head can be lifted by the bump and then fall to knock the main body.

[0009] The air curtain blowing mechanism includes an air pipe and air blowing holes. The air blowing holes are provided on the inner circumferential wall of the second connecting pipe. There are multiple air blowing holes and they are arranged at intervals along the inner circumferential wall of the second connecting pipe. The air blowing holes blow air toward the circulating fluidized bed boiler. The air pipe is provided on the second connecting pipe, and the air pipe is connected to all the air blowing holes.

[0010] Furthermore, a first step groove is provided at one end of the first connecting pipe close to the main body, and a second step groove is provided at one end of the main body close to the first connecting pipe, and the first step groove and the second step groove cooperate with each other; a third step groove is provided at one end of the second connecting pipe close to the main body, and a fourth step groove is provided at one end of the main body close to the second connecting pipe, and the third step groove and the fourth step groove cooperate with each other.

[0011] Furthermore, a sealing ring and a bearing are provided between the first step groove and the second step groove, and between the third step groove and the fourth step groove.

[0012] Furthermore, the driving mechanism includes an outer ring gear, a gear and a motor. The outer ring gear is coaxially fixed on the outer peripheral wall of the main pipe body, and the motor is fixed on the outer peripheral wall of the first connecting pipe. The motor is connected to the gear, and the gear is engaged with the outer ring gear.

[0013] Furthermore, the inner diameters of the first connecting pipe, the main body and the second connecting pipe are equal.

[0014] Furthermore, there are multiple scrapers, and the multiple scrapers are arranged at intervals along the inner circumferential wall of the first connecting pipe.

[0015] Furthermore, there are multiple knocking rods, which are arranged at intervals around the main body, and each knocking rod is provided with multiple knocking heads arranged at intervals along its length direction.

[0016] Furthermore, along the rotation direction of the main body, the surface of the protrusion for lifting the striking head is a smooth curved surface, and the other side surface of the protrusion opposite to the curved surface is a plane, and the plane passes through the axis of the main body.

[0017] Furthermore, an annular ventilation groove is provided inside the second connecting pipe, the ventilation groove is communicated with all the blowing holes, and the air pipe is communicated with the ventilation groove.

[0018] Furthermore, the blowing holes are inclined holes inclined toward the circulating fluidized bed boiler.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The original one-piece fixed feed pipe is designed into a three-section structure of static-dynamic-static. The connecting pipes at both ends are fixed, and the main pipe in the middle can rotate as a whole, forming a "rotating sleeve" conveying channel. The three mechanisms of rotary scraping, automatic vibration, and air curtain isolation are integrated into the feed pipe to solve the problem of material sticking in the feed pipe.

[0021] 2. During the rotary scraping, the fixed long scraper extends into the rotating main body and fits the inner wall completely. Each rotation completes a 360° scraping, removing the lime stuck to the wall in real time.

[0022] 3. The bump-striking rod-striking head constitutes a passive mechanical vibrator, which is energy-saving and environmentally friendly. The main body rotates itself to make the bump periodically lift and release the striking head, generating vibration, making it difficult for lime particles to adhere to the main body;

[0023] 4. A circle of oblique air holes is set on the inner wall of the second connecting pipe to form an air curtain, which has both anti-sticking and conveying auxiliary functions, isolating the high-temperature wall surface and blowing the lime particles into the furnace.

[0024] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. The drawings are only examples and are not drawn strictly to scale. Those skilled in the art can also derive other drawings based on these drawings without inventive work.

[0026] Figure 1 is a schematic diagram of a circulating fluidized bed boiler in the prior art;

[0027] Figure 2 It is a front view of the feed pipe portion of the present invention;

[0028] Figure 3 It is a perspective view of the feed pipe portion of the present invention from the left side;

[0029] Figure 4 It is a perspective view of the feed pipe portion of the present invention from the right side;

[0030] Figure 5 It is an exploded view of the feed pipe portion of the present invention;

[0031] Figure 6 It is a cross-sectional view of the feed pipe portion of the present invention;

[0032] Figure 7 is a cross-sectional view of the second connecting pipe portion of the present invention;

[0033] Figure 8 It is a schematic diagram of the vibration mechanism of the present invention.

[0034] Reference numerals:

[0035] 1. Circulating fluidized bed boiler; 2. Cyclone dust collector; 3. Feeder; 4. Lime feed silo; 5. Feed pipe; 6. First connecting pipe; 7. Second connecting pipe; 8. Main body; 9. Scraper; 10. Knocking rod; 11. Knocking head; 12. Bump; 13. Air pipe; 14. Blowing hole; 15. Sealing ring; 16. Bearing; 17. Outer gear ring; 18. Gear; 19. Motor; 20. Ventilation groove. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "vertical", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0038] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0039] In the description of the present invention, references to "first feature" and "second feature" may include one or more of these features. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features being described. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of these features.

[0040] like Figures 1-8 The feeding device of a circulating fluidized bed boiler 1 shown includes a circulating fluidized bed boiler 1 , a cyclone dust collector 2 , a return device 3 , a lime feeding bin 4 and a feeding pipe 5 .

[0041] like Figure 1 As shown, the circulating fluidized bed boiler 1 is connected to the cyclone dust collector 2. A return device 3 is provided at the bottom of the cyclone dust collector 2. The return device 3 is connected to the circulating fluidized bed boiler 1. The lime feeding bin 4 is connected to the circulating fluidized bed boiler 1 through a feeding pipe 5.

[0042] When the circulating fluidized bed boiler 1 is in operation, the gas-solid mixed fluid produced by combustion in the furnace passes through the cyclone dust collector 2 for gas-solid separation. Most of the separated solid particles (circulating material) flow to the return feeder 3 below and are returned to the furnace through the return feeder 3 for continued combustion, thus completing the cycle. To remove the SO2 generated in the furnace, limestone is added to react with the SO2 in the coal to form calcium sulfate, which is discharged with the slag. This is the conventional structure of the circulating fluidized bed boiler 1, and since it has been numerically evaluated by those skilled in the art, it will not be repeated here.

[0043] In order to improve the desulfurization reaction rate in the furnace, limestone is generally fed in the form of small-sized particles. However, limestone easily absorbs moisture in the flue gas or environmental humidity, causing deliquesce and adhesion on the particle surface to form lumps. In addition, impurities such as clay and organic matter in the limestone will soften at high temperatures and adhere to the particles to form hard lumps, which makes the feed pipe 5 prone to jamming.

[0044] In order to solve the problem of material jamming in the feed pipe 5, Figure 2-Figure 8As shown, the feed pipe 5 includes a first connecting pipe 6, a second connecting pipe 7, a main body 8, a scraper 9, a driving mechanism, a vibration mechanism and an air curtain blowing mechanism.

[0045] The first connecting pipe 6 is connected to the lime feeding bin 4, the second connecting pipe 7 is connected to the circulating fluidized bed boiler 1, and the main pipe 8 is coaxially connected between the first connecting pipe 6 and the second connecting pipe 7, and the main pipe 8 can rotate around its own axis;

[0046] A scraper 9 is fixed on the inner wall of the first connecting pipe 6. The scraper 9 extends into the main body 8 and extends to the end of the main body 8 close to the second connecting pipe 7. The scraper 9 abuts against the inner wall of the main body 8. The driving mechanism is connected to the main body 8 to drive the main body 8 to rotate circumferentially.

[0047] The vibration mechanism includes a knocking rod 10, a knocking head 11 and a protrusion 12. The protrusion 12 is provided on the outer peripheral wall of the main body 8. The knocking rod 10 is an elastic rod. One end of the knocking rod 10 is fixedly connected to the second connecting pipe 7, and the other end is fixedly provided with the knocking head 11. When the main body 8 rotates, the knocking head 11 can be lifted by the protrusion 12 and then falls to knock the main body 8.

[0048] The air curtain purge mechanism includes an air pipe 13 and air blowing holes 14. The inner wall of the second connecting pipe 7 is provided with air blowing holes 14. There are multiple air holes 14 and they are arranged at intervals along the inner wall of the second connecting pipe 7. The air blowing holes 14 blow air toward the circulating fluidized bed boiler 1. The second connecting pipe 7 is provided with an air pipe 13, and the air pipe 13 is connected to all the air blowing holes 14.

[0049] Specifically, this solution divides the original integrated feed pipe 5 into three parts, such as Figure 2-Figure 4 As shown, the feed pipe 5 includes two short connecting pipes and a long main pipe body 8 in the middle. The two short connecting pipes are mainly used to connect the lime feed bin 4 and the circulating fluidized bed boiler 1, and the long main pipe body 8 in the middle mainly serves to transport lime particles.

[0050] like Figure 5 and Figure 6 As shown, in order to prevent lime particles from adhering to the inner wall of the main body 8 during transportation, the present solution is provided with a scraper 9, which extends into the main body 8 and abuts against the inner wall of the main body 8. The first connecting pipe 6 and the second connecting pipe 7 are fixed, while the main body 8 can rotate under the action of the driving mechanism. Therefore, during the rotation of the main body 8, the scraper 9 can scrape the inner wall of the main body 8, effectively scraping off the lime particles that may be adhered to the main body 8.

[0051] In addition, a vibration mechanism is provided on the outer peripheral wall of the main body 8. When the main body 8 rotates, the protrusion 12 can lift the knocking head 11, causing the knocking rod 10 to elastically deform. When the protrusion 12 no longer lifts the knocking head 11, the knocking rod 10 is reset so that the knocking head 11 knocks the main body 8, thereby causing the main body 8 to vibrate, making it difficult for lime particles to adhere to the main body 8. This, combined with the scraping action of the scraper 9, can effectively eliminate the adhesion and jamming phenomenon of the main body 8.

[0052] When the lime particles are transported to the end of the feed pipe 5 and fed into the circulating fluidized bed boiler 1 through the second connecting pipe 7, since the temperature of the second connecting pipe 7 is relatively high, in order to prevent the lime particles from adhering to the second connecting pipe 7, Figure 6 and Figure 7 As shown, a circle of air holes 14 is provided on the inner peripheral wall of the second connecting pipe 7. The air holes 14 blow air toward the circulating fluidized bed boiler 1, thereby forming a layer of "air curtain air cushion", so that a certain air gap can be formed between the lime particles and the inner wall surface of the second connecting pipe 7. At the same time, the air holes 14 also have a purge function when blowing air, so that the lime particles are sent into the circulating fluidized bed boiler 1 as much as possible, making it difficult for the lime particles to adhere.

[0053] In specific settings, such as Figure 6 As shown, a first step groove is provided at one end of the first connecting pipe 6 close to the main body 8, and a second step groove is provided at one end of the main body 8 close to the first connecting pipe 6, and the first step groove and the second step groove cooperate with each other; a third step groove is provided at one end of the second connecting pipe 7 close to the main body 8, and a fourth step groove is provided at one end of the main body 8 close to the second connecting pipe 7, and the third step groove and the fourth step groove cooperate with each other.

[0054] A sealing ring 15 and a bearing 16 are provided between the first step groove and the second step groove, and between the third step groove and the fourth step groove. The sealing ring 15 can play a sealing role, and the bearing 16 facilitates the rotation of the main body 8.

[0055] like Figure 3 and Figure 4 As shown, the driving mechanism includes an outer ring gear 17, a gear 18 and a motor 19. The outer ring gear 17 is coaxially fixed on the outer peripheral wall of the main body 8, and the motor 19 is fixed on the outer peripheral wall of the first connecting pipe 6. The motor 19 is connected to the gear 18, and the gear 18 is engaged with the outer ring gear 17. Therefore, when the motor 19 is working, the main body 8 can be driven to rotate through the engagement of the gear 18 and the outer ring gear 17.

[0056] like Figure 6 As shown, the inner diameters of the first connecting pipe 6, the main body 8, and the second connecting pipe 7 are equal, thereby facilitating the scraping action of the scraper 9. Furthermore, a plurality of scrapers 9 can be provided, with the plurality of scrapers 9 being arranged at intervals along the inner circumferential wall of the first connecting pipe 6, thereby improving the scraping effect of the scrapers 9.

[0057] Furthermore, in order to increase the frequency of the knocking vibration, as Figure 2-Figure 5 As shown, there are multiple knocking rods 10, and the multiple knocking rods 10 are arranged at intervals around the main body 8. Each knocking rod 10 is provided with multiple knocking heads 11 arranged at intervals along the length direction thereof.

[0058] like Figure 8 As shown, along the rotation direction of the main body 8, the surface of the protrusion 12 used to lift the striking head 11 is a smooth curved surface, and the other side surface of the protrusion 12 opposite to the curved surface is a plane, and the plane passes through the axis of the main body 8, so that the plane will not play the role of lifting the protrusion 12, so that when the top block is pushed to the top of the curved surface, it will fall down quickly, which can effectively improve the striking vibration effect.

[0059] Furthermore, if Figure 7 As shown, an annular ventilation groove 20 is provided inside the second connecting pipe 7, and the ventilation groove 20 is connected to all the blowing holes 14, and the air pipe 13 is connected to the ventilation groove 20, so that the air pipe 13 can be connected to the external air supply system, and then air can be supplied to each blowing hole 14 through an annular ventilation groove 20. This air supply structure is simple, compact and easy to implement.

[0060] Furthermore, the blowing hole 14 is an inclined hole inclined toward the circulating fluidized bed boiler 1 . For example, the outlet wind direction of the blowing hole 14 may form an inclined angle of 15 degrees with the inner wall surface of the second connecting pipe 7 , which facilitates the blowing of lime particles.

[0061] In summary, this device has the following characteristics:

[0062] 1. The original integrated fixed feed pipe 5 is designed into a three-section structure of static-dynamic-static. The connecting pipes at both ends are fixed, and the main pipe body 8 in the middle can rotate as a whole, forming a "rotating sleeve" conveying channel. The three mechanisms of rotary scraping, automatic vibration, and air curtain isolation are integrated into the feed pipe 5, thus solving the problem of material sticking in the feed pipe 5.

[0063] 2. During the rotary scraping, the fixed long scraper 9 extends into the rotating main body 8 and fits the inner wall all the way. Each rotation completes a 360° scraping, removing the lime stuck to the wall in real time;

[0064] 3. The protrusion 12, the striking rod 10, and the striking head 11 constitute a passive mechanical vibrator, which is energy-saving and environmentally friendly. The main body 8 rotates itself, so that the protrusion 12 periodically lifts and releases the striking head 11, generating vibration, making it difficult for lime particles to adhere to the main body 8;

[0065] 4. A circle of oblique air holes 14 is provided on the inner wall of the second connecting pipe 7 to form an air curtain, which has both anti-sticking and conveying auxiliary functions, isolating the high-temperature wall surface and blowing the lime particles into the furnace.

[0066] Although some embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations to these embodiments without departing from the principles and purpose of the present invention are all within the scope of protection of the claims of the present invention.

Claims

1. A circulating fluidized bed boiler unloading device, comprising a circulating fluidized bed boiler, a cyclone dust collector, a return device, a lime feed bin, and a feed pipe, wherein the circulating fluidized bed boiler is connected to the cyclone dust collector, the return device is provided at the bottom of the cyclone dust collector, the return device is connected to the circulating fluidized bed boiler, and the lime feed bin is connected to the circulating fluidized bed boiler via the feed pipe, characterized in that: The feed pipe includes: a first connecting pipe, a second connecting pipe, a main body, a scraper, a driving mechanism, a vibration mechanism and an air curtain purge mechanism; The first connecting pipe is connected to the lime feeding bin, the second connecting pipe is connected to the circulating fluidized bed boiler, the main pipe is coaxially connected between the first connecting pipe and the second connecting pipe, and the main pipe can rotate around its own axis; A scraper is fixed on the inner wall of the first connecting pipe, the scraper extends into the main body and extends to an end of the main body close to the second connecting pipe, the scraper abuts against the inner wall of the main body, and the driving mechanism is connected to the main body to drive the main body to rotate circumferentially; The vibration mechanism includes a knocking rod, a knocking head and a bump. The bump is provided on the outer peripheral wall of the main body. The knocking rod is an elastic rod. One end of the knocking rod is fixedly connected to the second connecting pipe, and the other end is fixedly provided with the knocking head. When the main body rotates, the knocking head can be lifted by the bump and then fall to knock the main body. The air curtain blowing mechanism includes an air pipe and air blowing holes. The air blowing holes are provided on the inner circumferential wall of the second connecting pipe. There are multiple air blowing holes and they are arranged at intervals along the inner circumferential wall of the second connecting pipe. The air blowing holes blow air toward the circulating fluidized bed boiler. The air pipe is provided on the second connecting pipe, and the air pipe is connected to all the air blowing holes.

2. The circulating fluidized bed boiler unloading device according to claim 1, characterized in that: A first step groove is provided at one end of the first connecting pipe close to the main body, and a second step groove is provided at one end of the main body close to the first connecting pipe, and the first step groove and the second step groove cooperate with each other; a third step groove is provided at one end of the second connecting pipe close to the main body, and a fourth step groove is provided at one end of the main body close to the second connecting pipe, and the third step groove and the fourth step groove cooperate with each other.

3. The circulating fluidized bed boiler unloading device according to claim 2, characterized in that: A sealing ring and a bearing are provided between the first step groove and the second step groove, and between the third step groove and the fourth step groove.

4. The circulating fluidized bed boiler unloading device according to claim 1, characterized in that: The driving mechanism includes an outer ring gear, a gear and a motor. The outer ring gear is coaxially fixed on the outer peripheral wall of the main pipe body. The motor is fixed on the outer peripheral wall of the first connecting pipe. The motor is connected to the gear, and the gear is meshed with the outer ring gear.

5. The circulating fluidized bed boiler unloading device according to claim 1, characterized in that: The first connecting pipe, the main body, and the second connecting pipe have the same inner diameter.

6. The circulating fluidized bed boiler unloading device according to claim 1, characterized in that: There are multiple scrapers, and the multiple scrapers are arranged at intervals along the inner peripheral wall of the first connecting pipe.

7. The circulating fluidized bed boiler unloading device according to claim 1, characterized in that: There are multiple knocking rods, which are arranged at intervals around the main body. Each knocking rod is provided with multiple knocking heads which are arranged at intervals along the length direction of the knocking rod.

8. The circulating fluidized bed boiler unloading device according to claim 1, characterized in that: Along the rotation direction of the main body, the surface of the protrusion for lifting the striking head is a smooth curved surface, and the other side surface of the protrusion opposite to the curved surface is a plane, and the plane passes through the axis of the main body.

9. The circulating fluidized bed boiler unloading device according to claim 1, characterized in that: An annular ventilation groove is provided inside the second connecting pipe, the ventilation groove is communicated with all the blowing holes, and the air pipe is communicated with the ventilation groove.

10. The circulating fluidized bed boiler unloading device according to claim 1, characterized in that: The air blowing holes are inclined holes inclined toward the circulating fluidized bed boiler.

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