Fluidized air pipe and air cap connecting device of fluidized bed boiler

Abstract

The utility model discloses a fluidized bed boiler fluidization air pipe and air cap connecting device which comprises a fluidization air pipe body, an air cap and an inner lantern ring. An inner lantern ring groove is formed in the inner wall of the hood, and the inner lantern ring is coaxially and rotatably embedded in the inner lantern ring groove; a plurality of clamping grooves are formed in the top of the inner lantern ring, a plurality of clamping teeth are arranged on the top face of the groove of the inner lantern ring in a surrounding mode, and the clamping teeth correspond to the clamping grooves in position in a one-to-one mode and can be embedded into the clamping grooves in a matched mode. The inner wall of the inner lantern ring is in threaded connection with the outer wall of the fluidization air pipe body; an anti-falling part matched and attached to the outer wall of the fluidization air pipe body is arranged on the portion, located above the inner lantern ring groove, of the inner wall of the air cap, a limiting groove is formed in the inner wall of the anti-falling part, and a limiting block matched with the limiting groove in shape is arranged at a pipe opening in the top of the fluidization air pipe body. The fluidized air duct can solve the technical problems that the air cap and the air duct are easy to loosen due to thread fastening and are inconvenient to repair and replace due to welding fastening, and prevents bed materials from leaking to a pressure equalizing air chamber from the fluidized air duct body to cause blockage of the air chamber.

Description

Technical Field

[0001] The utility model relates to the technical field of fluidized bed boiler equipment, in particular to a fluidized bed boiler fluidized air duct hood connecting device. Background Art

[0002] Circulating fluidized bed boiler, as a type of furnace that can use low calorific value coal, is widely used in my country.

[0003] As an important component of the circulating fluidized bed boiler, the fluidized air system is installed at the bottom of the boiler and consists of an equalizing air chamber, an air distribution plate, a fluidizing air duct, an air hood, etc. When the boiler is operating normally, there are about several hundred tons of high-temperature (about 900°C) bed material (slag) in the furnace, which is fluidized by the primary air (air) blown in by the air hood. The fluidized coal entering the furnace is fully burned by the primary and secondary air sent in by the blower, and heats the boiler water to generate steam through the water-cooled wall and other heating surfaces, thereby realizing heat exchange inside the boiler furnace.

[0004] Taking a 460t / h circulating fluidized bed boiler as an example, there are about 500 hoods installed on the air distribution plate of the boiler fluidizing air system. The structural diagram is shown in the figure below. Figure 1 In traditional fluidized bed boiler equipment, the hood is fixed to the fluidized air duct on the air distribution plate by threaded fastening or welding. Depending on the design of each boiler manufacturer, the weight of each hood is about 5-10kg. The hood and fluidized air duct are cast from high-temperature and wear-resistant high-chromium and high-nickel alloy. It has the following main functions:

[0005] 1. Ensure uniform air flow in the combustion chamber and help the gas flow in the bed.

[0006] 2. Promote the mixing of materials and gases in the bed, increase the reaction rate and improve the combustion efficiency.

[0007] 3. Evenly distribute air to ensure uniform fluidization of the entire furnace and avoid local coking

[0008] 4. By adjusting the air intake of the hood, the gas flow rate, pressure and other parameters in the combustion chamber are controlled to ensure the stable operation of the circulating fluidized bed boiler.

[0009] Since the main characteristics of circulating fluidized bed boilers are strong adaptability to coal types, a wide range of coal types, complex blending conditions, and mainly low calorific value coal types, most power plants will use or partially blend low calorific value coal gangue as the main fuel for the boiler, which will inevitably cause large particles of coal gangue to enter the boiler combustion system.

[0010] During the long-term operation of the circulating fluidized bed boiler, due to the disturbance of large air volume and the impact and friction of large particles of coal gangue when the bed material flows, the threaded wind cap is driven by the bed material to rotate in the loose direction, and the wind cap often falls off. After the wind cap falls off, a large amount of bed material will leak from the fluidized air duct to the equalizing air chamber, affecting the passage of the primary air, causing the air chamber to be blocked, and the fluidity of the bed material is poor. In serious cases, it affects the operation safety and is forced to shut down the furnace. Moreover, the small air vents on the wind cap are also easily blocked by the bed material. After long-term contact with the bed material, wear and even cracks may occur. Various reasons cause uneven air discharge from the wind cap, which causes the bed material to leak into the fluidized air duct. Therefore, the wind cap on the fluidized air duct needs to be regularly inspected, repaired, and replaced, while the wind cap fixed by welding is inconvenient to repair and cannot be replaced. Therefore, it is necessary to provide a fluidized air duct wind cap connection device for a fluidized bed boiler to solve the technical problem that the above-mentioned wind cap and the air duct are easy to loosen when fastened by thread, and inconvenient to repair and replace when fastened by welding. Utility Model Content

[0011] The utility model provides a fluidized bed boiler fluidized air duct hood connecting device, which can solve the technical problems that the hood and the air duct are easy to loosen by threaded fastening and inconvenient to repair and replace by welding fastening, and avoid abnormal operation of the hood causing bed material to leak from the fluidized air duct body to the equalizing air chamber, causing the air chamber to be blocked and the furnace to be forced to stop.

[0012] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0013] A fluidized bed boiler fluidized air duct hood connection device, comprising a fluidized air duct body, a hood and an inner sleeve ring; the inner wall of the hood is provided with an inner sleeve ring groove, the inner sleeve ring is coaxially movably embedded in the inner sleeve ring groove, so that the inner sleeve ring can rotate and move with the hood along the inner sleeve ring groove; the top of the inner sleeve ring is provided with a plurality of surrounding grooves, and the hood is provided with a plurality of surrounding teeth corresponding to the top surface of the inner sleeve ring groove, and the position of each of the teeth corresponds to the position of a slot, so that the top surface of the inner sleeve ring groove is aligned with the inner sleeve ring groove. After the top of the inner ring is fitted, each of the teeth is matched and embedded in the corresponding groove; the inner wall of the inner ring is threadedly connected to the outer wall of the fluidizing air duct body; the inner wall of the hood is located above the groove of the inner ring and is provided with an annular anti-slip portion protruding inward, the inner wall of the anti-slip portion is matched and fitted with the outer wall of the fluidizing air duct body, the inner wall of the anti-slip portion is provided with at least one limiting groove running through in the vertical direction, and at least one limiting block is provided at the top pipe opening of the fluidizing air duct body, and each limiting block matches the shape of a limiting groove.

[0014] Furthermore, the anti-detachment portion includes a first flange and a second flange which are spaced apart from each other in the upper and lower parts, so that an annular groove is formed between the first flange and the second flange; the inner wall of the first flange is provided with a first limiting groove which penetrates along the vertical direction, and the inner wall of the second flange is provided with a second limiting groove which penetrates along the vertical direction, and the positions of the first limiting groove and the second limiting groove are arranged alternately; at least one limiting block is provided at the top pipe opening of the fluidizing air duct body, and the shape of the limiting block matches the shape of the first limiting groove and the second limiting groove.

[0015] Furthermore, two upper and lower staggered limit blocks are provided on the outer peripheral side of the top pipe opening of the fluidizing air duct body, and the positions of the two limit blocks correspond to the positions of the first limit groove and the second limit groove respectively.

[0016] Furthermore, the hood includes a cap body and a cylinder body distributed up and down, the cap body is set to a smooth hemispherical structure, the cylinder body is set to a cylindrical structure, the anti-slip portion and the cap body are arranged at intervals, and the cylinder body is located between the anti-slip portion and the cap body and is densely distributed with a number of air outlet holes inclined downward; the anti-slip portion and the inner ring groove are arranged at intervals on the inner wall of the cylinder from top to bottom.

[0017] Furthermore, the inner ring groove is configured as an annular groove, and a plurality of the latch teeth are distributed at equal angles along the top surface of the annular groove and protrude downward.

[0018] Furthermore, each of the latch teeth is configured as a right-angled triangle structure, the hypotenuse of each of the latch teeth faces downward, and each of the latch grooves is configured as a matching right-angled triangle groove.

[0019] Furthermore, each of the latch teeth is configured as a hemispherical structure, and each of the latch grooves is configured as a matching spherical groove.

[0020] Furthermore, at least one cross grille is provided in the fluidizing air duct body.

[0021] Furthermore, two cross grilles are provided in the fluidizing air duct body, and the two cross grilles are alternately distributed at intervals up and down.

[0022] The beneficial effects of the utility model are:

[0023] 1) The utility model designs two anti-slip structures to prevent the hood from loosening from the fluidizing air duct body. The first anti-slip structure is to design an inner sleeve ring with a press-and-spin connection inside the hood, which is threadedly connected to the fluidizing air duct body through the inner sleeve ring, so that the hood can drive the inner sleeve ring to rotate to loosen only when there is sufficient downward pressure. However, the press-and-spin design of the hood not only provides a tight connection for the hood, but also, under the action of wind pressure, the upper part of the hood is affected by the wind pressure in the fluidizing air duct body and is lifted up and supported in a suspended state by the wind pressure. When the boiling bed material continuously hits and rubs the hood, part of the force is offset by the wind force. In this process, the hood rotates freely with the friction of the bed material and cannot be pressed against the inner sleeve ring, which plays a good anti-slip effect. The second anti-slip structure in the utility model is inside the hood An anti-slip portion is designed. Only when the limit groove is aligned with the limit block, can the limit block pass through the limit groove and the wind hood can be removed. Therefore, even if the wind hood is pressed against the inner ring and drives the inner ring to rotate and loosen, it cannot directly detach from the fluidized air duct body. Only under extremely coincidental circumstances can the limit block align with the limit groove. Such a design greatly reduces the possibility of the wind hood falling off after being rotated by friction. The above two anti-slip structures can solve the problem of the circulating fluidized bed boiler not shutting down due to the large amount of bed material leaking off the wind hood during operation. Such a design is not like welding that cannot be loosened and replaced. After the wind hood is worn and cracked, it can still be manually disassembled without cutting or other means. The disassembly and assembly operations are very convenient, and it is very reliable after installation, which is suitable for promotion.

[0024] 2) The anti-detachment part is designed as a first flange and a second flange. Even if the limit block accidentally passes through the limit groove on one of the flanges, it will still be blocked by the other flange and cannot be directly detached, further reducing the possibility of the hood falling off after being rotated by friction.

[0025] 3) Three obstructions are formed between the two limit blocks and the first flange and the second flange; the first obstruction is between the first limit block and the second flange, and this position needs to be aligned before it can continue to loosen; thereafter, the first limit block enters the annular groove and is blocked by the first flange. Therefore, the second obstruction is between the first limit block and the first flange, and between the second limit block and the second flange. The two limit blocks need to be aligned with the limit grooves of these two positions at the same time before they can continue to loosen; after the second obstruction is passed, the second limit block enters the annular groove and is blocked by the first flange. Therefore, the third obstruction is between the second limit block and the first flange, and the second limit block needs to be aligned with the limit groove of the first flange before it can continue to loosen. After three obstructions, the anti-fall-off function is realized, which greatly reduces the possibility of the hood falling off after being rotated by friction.

[0026] 4) The anti-slip portion and the cap body are arranged at intervals to reserve sufficient space for the arrangement of the air holes; the anti-slip portion and the inner ring groove are arranged at intervals to reserve sufficient movable space between the hood and the inner ring, so that the limit block can be press-spin connected to the inner ring only after it has completely passed through the anti-slip portion, avoiding interference between the position alignment of the anti-slip portion and the threaded connection of the inner ring; the hood is provided with downwardly inclined air outlet holes, and gas is ejected from the air outlet holes and acts on the air distribution plate to form a uniform upward wind force. Several hoods in the fluidized bed work simultaneously to form a fluidized bed, which lifts up the bed material. The bed material remains in a boiling state as the wind agitates and rubs against the top of the hood. Therefore, the top of the hood is designed to be a smooth hemispherical structure to reduce the friction force on the hood.

[0027] 5) Even if the wind cap is accidentally detached due to the friction, the cross grille in the fluidized air duct body can still block the larger bed material, and cooperate with the dual effect of wind pressure to prevent small particles from falling further, thus forming a blockage phenomenon, and there will be no problem of slag leakage causing the boiler to be forced to shut down. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0029] Figure 1 It is a structural schematic diagram of the utility model when the wind cap and the fluidized wind pipe body are installed;

[0030] Figure 2 It is a three-dimensional diagram of the stroke cap of the utility model after being bisected along the axis;

[0031] Figure 3 It is a three-dimensional diagram of the fluidizing air duct and the inner sleeve ring in the utility model when they are connected;

[0032] Figure 4 This is a structural diagram of step one during installation in the utility model;

[0033] Figure 5 This is a structural diagram of step 2 during installation in the utility model;

[0034] Figure 6 This is a schematic diagram of the structure of step three during installation in the utility model;

[0035] Figure 7 This is a schematic diagram of the structure of step 4 during installation in the utility model;

[0036] Figure 8 This is a schematic diagram of the structure in the final state of the utility model using the first installation method;

[0037] Fig. 9 This is a schematic diagram of the structure in the final state of the second installation method used in the utility model;

[0038] Figure ID:

[0039] 1-fluidizing air duct body, 2-wind hood, 3-inner sleeve ring, 4-air distribution plate, 11-limiting block, 12-cross grille, 21-inner sleeve ring groove, 22-grid, 23-anti-slip portion, 24-air outlet, 231-first flange, 232-second flange, 233-annular groove, 234-first limiting groove, 235-second limiting groove, 31-slot. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is referred to as being "set in the middle", it does not only mean being set in the middle, as long as it is not set at both ends within the range defined by the middle. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0043] Reference Figures 1 to 9As shown, a fluidized bed boiler fluidized air duct hood connection device comprises a fluidized air duct body 1, a hood 2 and an inner sleeve ring 3; the inner wall of the hood 2 is provided with an inner sleeve ring groove 21, the inner sleeve ring 3 is coaxially movably embedded in the inner sleeve ring groove 21, so that the inner sleeve ring 3 can rotate and move with the hood 2 along the inner sleeve ring groove 21; the top of the inner sleeve ring 3 is provided with a plurality of surrounding grooves 31, and the hood 2 is provided with a plurality of surrounding teeth 22 corresponding to the top surface of the inner sleeve ring groove 21, and the position of each of the teeth 22 corresponds to the position of a slot 31, so that the inner sleeve ring groove 21 is provided with a plurality of teeth 22 arranged in a surrounding manner. After the top surface fits with the top of the inner ring 3, each of the latch teeth 22 is matched and embedded in the corresponding latch groove 31; the inner wall of the inner ring 3 is threadedly connected to the outer wall of the fluidizing air duct body 1; the inner wall of the hood 2 is located above the inner ring groove 21 and is provided with an inwardly protruding annular anti-slip portion 23, the inner wall of the anti-slip portion 23 is matched and fit with the outer wall of the fluidizing air duct body 1, and the inner wall of the anti-slip portion 23 is provided with at least one limiting groove running through in the vertical direction, and at least one limiting block 11 is provided at the top pipe opening of the fluidizing air duct body 1, and each limiting block 11 matches the shape of a limiting groove. The utility model designs two anti-slip structures to prevent the hood 2 from being loosened from the fluidizing air duct body 1. The first anti-slip structure is to design an inner sleeve ring 3 with a press-and-spin connection inside the hood 2, which is threadedly connected to the fluidizing air duct body 1 through the inner sleeve ring 3, so that the hood 2 can drive the inner sleeve ring 3 to rotate to achieve loosening only when there is sufficient downward pressure. However, the press-and-spin design of the hood 2 not only provides a tight connection for the hood 2, but also, under the action of wind pressure, the upper part of the hood 2 is affected by the wind pressure in the fluidizing air duct body 1, and is lifted up and supported by the wind pressure to be in a suspended state, such as Figure 7 or Figure 8 As shown, when the boiling bed material continuously hits the friction hood 2, part of the force is offset by the wind force. During this process, the hood 2 rotates freely with the friction of the bed material and cannot be pressed against the inner ring 3, which plays a good anti-slip effect. The second anti-slip structure in the utility model is to design an anti-slip portion 23 in the hood 2. Only when the limit groove is aligned with the limit block 11, the limit block 11 can pass through the limit groove to remove the hood 2. Therefore, even if the hood 2 is pressed against the inner ring 3 and drives the inner ring 3 to rotate and loosen, it cannot directly detach from the fluidized air duct body 1. , the limit block 11 can only be aligned with the limit groove under extremely coincidental circumstances. Such a design greatly reduces the possibility of the hood 2 falling off after being rotated by friction. Through the above two anti-falling structures, the non-stop accident of the circulating fluidized bed boiler caused by the hood 2 falling off a large amount of bed material during operation can be solved. Such a design is not like welding that cannot be loosened and replaced. After the hood 2 is worn and cracked, it can still be manually disassembled without using cutting and other means. The disassembly and assembly operations are very convenient, and it is very reliable after installation, which is suitable for promotion.

[0044] Please refer to Figure 2 As shown, the anti-slip portion 23 includes a first flange 231 and a second flange 232 spaced apart from each other, so that an annular groove 233 is formed between the first flange 231 and the second flange 232; the inner wall of the first flange 231 is provided with a first limiting groove 234 penetrating in the vertical direction, and the inner wall of the second flange 232 is provided with a second limiting groove 235 penetrating in the vertical direction, and the positions of the first limiting groove 234 and the second limiting groove 235 are arranged alternately; at least one limiting block 11 is provided at the top pipe opening of the fluidizing air duct body 1, and the shape of the limiting block 11 matches the shape of the first limiting groove 234 and the second limiting groove 235. The anti-slip portion 23 is designed as a first flange 231 and a second flange 232. Even if the limiting block 11 accidentally passes through the limiting groove on one of the flanges, it will still be blocked by the other flange and cannot be directly detached, further reducing the possibility of the hood falling off after being rotated by friction. As one of the preferred solutions, please refer to Figure 3 As shown, two upper and lower staggered limit blocks 11 are provided on the outer peripheral side of the top pipe opening of the fluidizing air duct body 1, and the positions of the two limit blocks 11 correspond to the positions of the first limit groove 234 and the second limit groove 235 respectively. Three obstructions are formed between the two limit blocks 11 and the first flange 231 and the second flange 232; the first obstruction is between the first limit block 11 and the second flange 232, and this position needs to be aligned before it can be further loosened; thereafter, the first limit block 11 enters the annular groove 233 and is blocked by the first flange 231. Therefore, the second obstruction is between the first limit block 11 and the first flange 231, and between the second limit block 11 and the second flange 232. The two limit blocks 11 need to be aligned. It is necessary to align with the limit grooves at these two positions at the same time before it can continue to loosen; after passing the second obstruction, the second limit block 11 enters the annular groove 233 and is blocked by the first flange 231. Therefore, the third obstruction is between the second limit block 11 and the first flange 231. The second limit block 11 needs to be aligned with the limit groove of the first flange 231 before it can continue to loosen. After three obstructions, the anti-falling function is realized, which greatly reduces the possibility of the hood 2 falling off after being rotated by friction.

[0045] Please refer to Figures 4 to 9As shown, the hood 2 includes a cap body and a cylinder body distributed up and down, the cap body is set as a smooth hemispherical structure, the cylinder body is set as a cylindrical structure, the middle part of the cylinder body is provided with an external thread, and the outer diameter of the top of the cylinder body is slightly smaller than the outer diameter of the middle part; the anti-slip part 23 is arranged at intervals from the cap body, and the cylinder body is densely distributed with a number of air outlet holes 24 inclined downward between the anti-slip part 23 and the cap body; the anti-slip part 23 and the inner sleeve ring groove 21 are arranged at intervals on the inner wall of the cylinder from top to bottom. The inner sleeve ring groove 21 is set as an annular groove, and a number of the latch teeth 22 are distributed at equal angles along the top surface of the annular groove 21 and protrude downward. The anti-slip portion 23 is arranged at intervals from the cap body, which reserves sufficient space for the arrangement of the air holes 24 and avoids interference between the top of the fluidized air duct body 1 and the cap body; the anti-slip portion 23 and the inner ring groove 21 are arranged at intervals, which reserves sufficient space for movement between the hood 2 and the inner ring 3, so that the limit block 11 can be press-rotated connected to the inner ring 3 only after it has completely passed through the anti-slip portion 23, avoiding interference between the position alignment of the anti-slip portion 23 and the threaded connection of the inner ring 3; the hood 2 is provided with an air outlet hole inclined downward, and the gas is ejected from the air outlet hole and acts on the air distribution plate 4 to form a uniform upward wind force. Several hoods 2 in the fluidized bed work simultaneously to form a fluidized bed, which lifts the bed material. The bed material remains in a boiling state as the wind force stirs and rubs against the top of the hood 2. Therefore, the top of the hood 2 is designed as a smooth hemispherical structure to reduce the friction force on the hood. During manufacturing, the hood 2 can be symmetrically divided into two halves along the axis, and each of them is cast as one piece using a mold. The first limiting groove 234 and the second limiting groove 235 can be separately opened on one of the halves of the hood 2; when installing the inner ring 3, first install the inner ring 3 in the inner ring groove 21 of one of the halves, and then cover the other halves and weld them together, and finally polish the outer weld to make it smooth.

[0046] Since the hood 2 and the inner ring 3 are connected by a press-and-spin type, downward pressure is required to allow the hood 2 to drive the inner ring 3 to rotate. Therefore, the hood 2 is provided with a latch tooth 22 on the top surface of the inner ring groove 21, and the top surface of the inner ring 3 is provided with a latch groove 31 corresponding to the latch tooth 22. When pressed downward, the latch tooth 22 is embedded in the latch groove 31 to drive the inner ring to rotate.

[0047] Please refer to Figure 2 As shown in the figure, as one of the preferred solutions of the latch teeth 22 and the latch grooves 31, each of the latch teeth 22 can be set as a right-angled triangle structure, the hypotenuse of each of the latch teeth 22 faces downward, and each of the latch grooves 31 is set as a matching right-angled triangle groove. The hypotenuse of the latch teeth 22 should face the direction of loosening. Such a design requires a greater downward force to drive the inner ring 3 to rotate, otherwise the latch teeth of the hood 2 will slide out of the hypotenuse of the latch groove 31, which can reduce the possibility of the hood 2 falling off after being rotated by friction.

[0048] Similarly, as one of the preferred solutions for the latch teeth 22 and the latch grooves 31, each of the latch teeth 22 can also be set as a hemispherical structure, and each of the latch grooves 31 can be set as a matching spherical groove. The resistance between the hemispherical latch teeth 22 and the spherical grooves 31 is smaller, and a larger downward pressure is required to allow the hood 2 to drive the inner ring 3 to rotate.

[0049] At least one cross grille 12 is provided in the fluidized air duct body 1. As one of the preferred solutions, two cross grilles 12 are provided in the fluidized air duct body 1, and the two cross grilles 12 are staggered and distributed at intervals up and down. Even if the wind cap 2 is accidentally detached after being rotated by friction, the cross grille 12 in the fluidized air duct body 1 can still block the larger bed material, and cooperate with the dual effect of wind pressure to prevent small particles from falling further, forming a blocking phenomenon, and there will be no problem of forced shutdown of the boiler due to continuous slag leakage.

[0050] There are two installation methods for this utility model:

[0051] The first installation method:

[0052] Step 1: Please refer to Figure 4 As shown, first, the hood 2 is mounted on the fluidizing air duct body 1;

[0053] Step 2: Please refer to Figure 5 As shown, the hood 2 is rotated to allow the limit blocks 11 on the top of the fluidizing air duct body 1 to pass through the anti-detachment portion 23 of the hood 2 one by one;

[0054] Step 3: Please refer to Figure 6 As shown, the hood 2 is further pressed down to align the latch teeth 22 on the hood 2 with and insert them into the latch grooves 31 of the inner ring 3;

[0055] Step 4: Please refer to Figure 7 As shown, the hood 2 is rotated while applying downward pressure to drive the inner ring 3 and the fluidizing air duct body 1 to be fastened by threads;

[0056] The final status of the first installation method is as follows Figure 8 As shown, when the hood 2 is loosened, the hood 2 must be pressed downward and rotated first to loosen the inner ring 3, and then the limiting blocks 11 on the fluidizing air duct body 1 are aligned one by one with the limiting grooves on the anti-detachment part 23, and the loosening can be completed after the anti-detachment part 23 is separated.

[0057] The second installation method:

[0058] Different from the first installation method, after executing steps 1 to 4, it is necessary to pass the limit blocks 11 on the top of the fluidizing air duct body 1 through the anti-detachment portion 23 of the hood 2 one by one, so that the top of the fluidizing air duct body 1 is located below the anti-detachment portion 23. The final state is as follows: Fig. 9 shown.

[0059] The advantage of the second installation method is that when loosening, the limit blocks 11 on the top of the fluidizing air duct body 1 need to be passed through the anti-detachment part 23 of the hood 2 one by one to achieve the press-and-screw connection between the hood 2 and the inner ring 3, and finally the limit blocks 11 on the fluidizing air duct body 1 are aligned with the limit grooves on the anti-detachment part 23 one by one to complete the loosening. The loosening process adds one step, which greatly reduces the risk of accidental falling off of the hood 2 during operation.

[0060] The above embodiments are only used to illustrate the technical solution of the utility model but not to limit it. Any modification or equivalent substitution that does not deviate from the spirit and scope of the utility model shall be included in the scope of the technical solution of the utility model.

Claims

1. A fluidized bed boiler fluidized air duct cap connection device, characterized in that: The invention comprises a fluidizing air duct body, a hood and an inner sleeve ring; the inner wall of the hood is provided with an inner sleeve ring groove, the inner sleeve ring is coaxially movably embedded in the inner sleeve ring groove, so that the inner sleeve ring can rotate and move with the hood along the inner sleeve ring groove; the top of the inner sleeve ring is provided with a plurality of surrounding grooves, the hood is provided with a plurality of surrounding teeth corresponding to the top surface of the inner sleeve ring groove, the position of each of the teeth corresponds to the position of a groove, so that the top surface of the inner sleeve ring groove fits with the top of the inner sleeve ring Afterwards, each of the latch teeth is matched and embedded in a corresponding latch groove; the inner wall of the inner ring is threadedly connected to the outer wall of the fluidizing air duct body; the inner wall of the hood is located above the inner ring groove and is provided with an inwardly protruding annular anti-slip portion, the inner wall of the anti-slip portion is matched and fits with the outer wall of the fluidizing air duct body, the inner wall of the anti-slip portion is provided with at least one limiting groove running through in the vertical direction, and at least one limiting block is provided at the top pipe opening of the fluidizing air duct body, and each limiting block matches the shape of a limiting groove.

2. The fluidized bed boiler fluidized air duct hood connection device according to claim 1, characterized in that: The anti-detachment portion includes a first flange and a second flange spaced apart in an upper and lower direction, so that an annular groove is formed between the first flange and the second flange; the inner wall of the first flange is provided with a first limiting groove penetrating along the vertical direction, and the inner wall of the second flange is provided with a second limiting groove penetrating along the vertical direction, and the positions of the first limiting groove and the second limiting groove are staggered; at least one limiting block is provided at the top pipe opening of the fluidizing air duct body, and the shape of the limiting block matches the shape of the first limiting groove and the second limiting groove.

3. A fluidized bed boiler fluidized air duct hood connection device according to claim 2, characterized in that: Two upper and lower staggered limit blocks are arranged on the outer peripheral side of the top pipe opening of the fluidizing air duct body, and the positions of the two limit blocks correspond to the positions of the first limit groove and the second limit groove respectively.

4. A fluidized bed boiler fluidized air duct hood connection device according to claim 2, characterized in that: The hood includes a cap body and a cylinder body distributed up and down, the cap body is set to a smooth hemispherical structure, the cylinder body is set to a cylindrical structure, the anti-slip portion and the cap body are arranged at intervals, and the cylinder body is located between the anti-slip portion and the cap body and is densely distributed with a number of air outlet holes inclined downward; the anti-slip portion and the inner ring groove are arranged at intervals in sequence from top to bottom on the inner wall of the cylinder.

5. A fluidized bed boiler fluidized air duct hood connection device according to claim 4, characterized in that: The inner sleeve ring groove is configured as an annular groove, and a plurality of the latch teeth are distributed at equal angles along the top surface of the annular groove and protrude downward.

6. A fluidized bed boiler fluidized air duct hood connection device according to claim 5, characterized in that: Each of the latch teeth is configured as a right-angled triangle structure, the hypotenuse of each of the latch teeth faces downward, and each of the latch grooves is configured as a matching right-angled triangle groove.

7. The fluidized bed boiler fluidized air duct hood connection device according to claim 5, characterized in that: Each of the latch teeth is configured as a hemispherical structure, and each of the latch grooves is configured as a matching spherical groove.

8. The fluidized bed boiler fluidized air duct hood connection device according to claim 1, characterized in that: At least one cross grille is arranged in the fluidizing air duct body.

9. A fluidized bed boiler fluidized air duct hood connection device according to claim 8, characterized in that: Two cross grilles are arranged in the fluidizing air duct body, and the two cross grilles are alternately distributed up and down.

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