A fly ash discharging device for fluidized bed boiler

Abstract

The application discloses a fluidized bed boiler return material ash discharging device, which belongs to the technical field of boiler return material devices and comprises a return material shell, a telescopic rod fixedly connected in the return material shell, a partition frame fixedly connected with the telescopic end of the telescopic rod and in sliding connection with the return material shell, a plurality of air storage pipes arranged in the return material shell, a plurality of first branch pipes fixedly connected and communicated with the air storage pipes, an adjusting pipe in sliding connection and communication with the first branch pipes, a lifting pipe in sliding connection and communication with the adjusting pipe, a lifting shell fixedly connected and communicated with the lifting pipe, lifting frames fixedly connected with the adjusting pipes corresponding to the same air storage pipe, and a plurality of connecting rods fixedly connected between adjacent lifting frames. The position of the lifting shell is adjusted, the lifting shell is moved to the upper part of the accumulated material, the shielding area of the first exhaust hole on the lifting shell by the accumulated material is reduced, and therefore the total amount of the material delivered into the boiler is kept in a stable state.

Description

Technical Field

[0001] This invention relates to the field of boiler return material device technology, and in particular to a return ash discharge device for fluidized bed boilers. Background Technology

[0002] Fluidized bed boilers are a type of high-efficiency combustion equipment widely used in power, heating, and industrial boilers. Their core technology is to achieve fluidization of solid particles by precisely controlling the airflow velocity, thereby significantly improving combustion efficiency. Depending on the type of fuel, solid particles can be divided into two categories: traditional fuel particles (such as coal gangue, coke, etc.) and compressed biomass particles. In recent years, with the promotion of renewable fuel applications, compressed biomass particles have gradually become one of the mainstream fuel types due to their high calorific value and low pollution characteristics.

[0003] In actual operation, the return feeder of the fluidized bed boiler can send the unburned biomass pellets and ash back into the furnace, so that the unburned biomass pellets can continue to participate in combustion. During this process, the ash will absorb some of the heat generated by the combustion of biomass pellets, so that the internal temperature of the boiler remains stable.

[0004] However, when the return feeder processes compressed biomass pellets, the unburned residue mixed with ash is more prone to agglomeration due to the high volatile and alkali metal content of the biomass pellets, forming a dense coking body. Coking not only causes abnormal expansion of the pellet volume but also significantly increases the return resistance. Some coked pellets are deposited inside the return feeder due to insufficient power and gradually cover the tuyeres area, weakening the fluidization effect of the airflow on the settled pellets. This reduces the efficiency of the return feeder to the furnace, leading to uneven temperature distribution in the furnace and incomplete combustion of biomass pellets, ultimately threatening the overall stability of the boiler operation. Summary of the Invention

[0005] This invention provides a return ash discharge device for fluidized bed boilers to overcome the problem that the accumulation of settled particles in the return feeder affects the total amount of ash and slag conveyed by the return feeder to the conveying boiler.

[0006] The technical solution of the present invention is as follows: a return ash discharge device for a fluidized bed boiler, comprising a return shell, a telescopic rod fixedly connected inside the return shell, a partition frame slidably connected to the telescopic end of the telescopic rod, a plurality of air storage pipes arranged inside the return shell, a plurality of first branch pipes fixedly connected and connected to the air storage pipes, a regulating pipe slidably connected and connected to the first branch pipes, the regulating pipe slidably connected to the partition frame, a lifting pipe slidably connected and connected to the regulating pipe, and a first spring fixedly connected between the two, a lifting shell fixedly connected and connected to the lifting pipe, a uniformly distributed first exhaust hole arranged on the lifting shell, a lifting frame jointly fixedly connected to the corresponding regulating pipe on the same air storage pipe, a plurality of connecting rods jointly fixedly connected between adjacent lifting frames, a power component arranged on the return shell for periodically moving the lifting shell upward away from the accumulated ash after ash and slag accumulation, and a limiting component arranged on the partition frame for periodically lowering the partition frame.

[0007] To further explain, the power assembly includes symmetrically distributed L-shaped rods, the middle of which is hinged to the return material shell. The L-shaped rods are used to push the lifting frame upward. An adjusting block is hinged to one end of the L-shaped rod near the separator, and the adjusting block is slidably connected to the separator.

[0008] To further explain, the regulating tube is fixedly connected to a protective shell, and the protective shell is in contact with the partition frame.

[0009] To further explain, the protective shell is trumpet-shaped, and the diameter of the protective shell increases with the distance between it and the regulating tube, and the minimum inner diameter of the protective shell is greater than the maximum diameter of the lifting shell.

[0010] To further explain, the limiting component includes a limiting rod, which is slidably connected to the separator frame. A second spring is fixed between the limiting rod and the separator frame. The return material shell is provided with axially distributed limiting grooves, which are used to limit the limiting rod.

[0011] To further explain, the end of the limiting rod away from the partition is a hemispherical head, and the depth of the axially distributed limiting groove increases with the distance between it and the partition, and the depth of the limiting groove is less than the radius of the upper hemispherical head of the limiting rod.

[0012] Further explanation: The system also includes a blowing assembly, which is disposed on the return material shell. The blowing assembly is used to blow air from the bottom onto the ash and slag accumulated on the separator, reducing the amount of ash and slag accumulating on the upper side of the separator. The blowing assembly includes multiple air inlet pipes disposed inside the return material shell. All the air inlet pipes are arranged at intervals with all the air storage pipes. Each air inlet pipe is fixedly connected to and connected to a second branch pipe. The second branch pipe is slidably connected to and connected to a sealing pipe slidably connected to the separator. A connection is provided between the second branch pipe and the sealing pipe. The sealing tube is damped and slidably connected to a fixed shell that is rotatably connected to the partition frame. A tension spring is fixed between the two. The fixed shell is provided with evenly distributed second exhaust holes. A circular plate is provided at the top of the sealing tube to block the top second exhaust holes on the fixed shell. The sealing tube is provided with a connecting hole that communicates with the fixed shell. A rotating assembly is provided on the sealing tube. The rotating assembly is used to drive the fixed shell to rotate and increase the range of ash and slag it blows when the fixed shell blows the ash and slag accumulated on the partition frame.

[0013] To further explain, the rotating assembly includes a rotating tube that is slidably connected to an adjacent sealing tube. The second branch tube is located on the moving path of the rotating tube. The rotating tube is provided with a threaded groove. The rotating tube is slidably connected to an adjacent connecting rod. The connecting rod is provided with a protrusion that slides within the threaded groove.

[0014] Further explanation: The system also includes a material-dispensing assembly, which is mounted on the separator frame. This assembly moves the ash deposited on the separator frame, loosening the accumulated ash. The assembly includes multiple rotating rods, all rotatably connected to the separator frame. Multiple axially distributed corrugated claws are fixed to each rotating rod, and corrugated frames are slidably connected to the separator frame. The return material shell has several pairs of corrugated blocks, the same number as the rotating rods, fixed to it. These corrugated blocks press against adjacent corrugated frames, causing the corrugated frames to drive the rotating rods to reciprocate, adjusting the position of the gaps between the ash deposits on the separator frame.

[0015] To further explain, the wave height of the corrugated block increases as the distance between it and the partition increases, thereby gradually increasing the amplitude of the swing of the corrugated frame.

[0016] Compared with the prior art, the present invention has the following advantages: 1. After material accumulates on the upper side of the partition frame, the present invention adjusts the position of the lifting shell to move the lifting shell to the upper part of the accumulated material, thereby reducing the area of ​​the accumulated material blocking the first exhaust hole on the lifting shell, thus ensuring that the total amount of material conveyed into the boiler is in a stable state.

[0017] 2. In the process of the fixed shell blowing the accumulated material from the bottom, the present invention increases the air output of the second exhaust hole on the side of the fixed shell by blocking the second exhaust hole at the top of the fixed shell through the sealing tube. At the same time, the fixed shell is adjusted by rotating the tube to improve the blowing effect of the fixed shell on the fine materials in the accumulated material.

[0018] 3. The present invention uses a limiting rod and a limiting groove to limit the partition frame. After the limiting rod releases the limiting rod from the partition frame, the partition frame descends rapidly, increasing the upward movement speed of the protective shell. This causes the protective shell to push the deposited material away from the lifting shell through impact. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a three-dimensional structural diagram of the air storage pipe, the first branch pipe, and the regulating pipe of the present invention;

[0021] Figure 3 This is a three-dimensional structural diagram of the lifting frame, L-shaped rod, and limiting rod of the present invention;

[0022] Figure 4 This is a three-dimensional structural diagram of the lifting shell, the second branch pipe, and the fixed shell of the present invention;

[0023] Figure 5 This is a three-dimensional structural diagram of the lifting tube, lifting shell, and first spring of the present invention;

[0024] Figure 6 This is a three-dimensional structural cross-sectional view of the lifting pipe, lifting shell, and protective shell of the present invention;

[0025] Figure 7 This is a three-dimensional structural diagram of the second branch pipe, sealing pipe, and rotating pipe of the present invention;

[0026] Figure 8 This is a three-dimensional structural cross-sectional view of the connecting rod and rotating tube of the present invention;

[0027] Figure 9 This is a three-dimensional structural diagram of the sealing tube, fixing shell, and tension spring of the present invention;

[0028] Figure 10 This is a three-dimensional structural diagram of the limiting rod, the second spring, and the rotating rod of the present invention;

[0029] Figure 11 This is a three-dimensional structural diagram of the rotating rod, the wave claw, and the wave frame of the present invention;

[0030] Figure 12 This is a three-dimensional structural diagram of the rotating rod, the wave frame, and the corrugated block of the present invention.

[0031] The components in the attached diagram are labeled as follows: 1-Return housing, 2-Telescopic rod, 3-Separator frame, 4-Air storage pipe, 401-Air inlet pipe, 5-First branch pipe, 6-Adjusting pipe, 7-Lifting pipe, 8-Lifting housing, 9-First spring, 10-Lifting frame, 11-Connecting rod, 12-L-shaped rod, 13-Adjusting block, 14-Protective housing, 15-Second branch pipe, 16-Sealing pipe, 17-Fixed housing, 18-Tension spring, 19-Rotating pipe, 20-Threaded groove, 21-Limiting rod, 22-Second spring, 23-Limiting groove, 24-Rotating rod, 25-Wave claw, 26-Wave frame, 27-Corrugated block. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] A return ash discharge device for a fluidized bed boiler, such as Figures 1-6 As shown, the system includes a return shell 1, a telescopic rod 2 fixedly connected inside the return shell 1, a partition frame 3 slidably connected to the telescopic end of the telescopic rod 2, multiple air storage pipes 4 inside the return shell 1, multiple first branch pipes 5 fixedly connected and connected to the air storage pipes 4, an adjusting pipe 6 slidably connected and connected to the first branch pipes 5, the adjusting pipe 6 slidably connected and connected to the partition frame 3, the adjusting pipe 6 slidably connected and connected to the lifting pipe 7, and a first spring 9 fixedly connected between the two, the lifting pipe 7 fixedly connected and connected to the lifting shell 8, the lifting shell 8 having evenly distributed first exhaust holes, the corresponding adjusting pipes 6 on the same air storage pipe 4 being fixedly connected to the lifting frame 10, multiple connecting rods 11 being fixedly connected between adjacent lifting frames 10, a power component for moving the lifting shell 8 upward away from the accumulated ash and slag after the ash and slag have accumulated in stages on the return shell 1, and a limiting component for lowering the partition frame 3 in stages on the partition frame 3.

[0034] The above solution provides a method in which, during the process of returning material to the boiler, when ash and slag accumulate on the separator 3, the lifting shell 8 is moved upward to increase the distance between it and the ash and slag, thereby reducing the area of ​​the ash and slag obstructing the first exhaust port on the lifting shell 8. In this embodiment, the upper part of the return shell 1 is connected to the cyclone separator in the boiler system, which is used to allow the cyclone separator to send the separated incompletely burned particles and ash and slag into the return shell 1 (the mixture of incompletely burned particles and ash and slag is referred to as material below). The left part of the return shell 1 is connected to the fluidized bed boiler, which is used to allow the return shell 1 to transport the material inside to the fluidized bed boiler. Inside the fluidized bed boiler, both the fluidized bed boiler and the cyclone separator are existing devices and are not shown in the attached drawings. The return material shell 1 has two telescopic rods 2 symmetrically distributed on the left and right. The two telescopic rods 2 are used to increase the stability of the separator 3 when it moves. The separator 3 divides the return material shell 1 into upper and lower chambers. The upper chamber of the return material shell 1 is used for material to pass through. In this embodiment, the adjacent air storage pipes 4 are interconnected and connected to an external air pump. Each air storage pipe 4 has five first branch pipes 5. The first exhaust holes of the lifting shell 8 are all inclined upward from the inside, so that the air blown out of the lifting shell 8 blows the material upward.

[0035] Furthermore, such as Figure 2 and Figure 3 As shown, the power assembly includes symmetrically distributed L-shaped rods 12. The middle part of the L-shaped rods 12 is hinged to the return housing 1. The L-shaped rods 12 are used to push the lifting frame 10 to move upward. An adjusting block 13 is hinged to one end of the L-shaped rods 12 near the separator 3. The adjusting block 13 is slidably connected to the separator 3.

[0036] Furthermore, such as Figures 4-6 As shown, the regulating pipe 6 is fixedly connected to the protective shell 14, and the protective shell 14 is in contact with the partition frame 3.

[0037] Furthermore, such as Figure 5 and Figure 6 As shown, the protective shell 14 is trumpet-shaped, and the diameter of the protective shell 14 increases with the distance between it and the regulating tube 6. The minimum inner diameter of the protective shell 14 is greater than the maximum diameter of the lifting shell 8.

[0038] In the above scheme, the distance between the rotation point of the L-shaped rod 12 and its leftmost end is greater than the distance between the rotation point of the L-shaped rod 12 and its rightmost end. This is used to amplify the distance the partition frame 3 moves as it moves downward, thereby increasing the distance the lifting frame 10 moves upward. The partition frame 3 is provided with a guide groove, and the adjusting block 13 slides within the guide groove of the partition frame 3. The protective shell 14 is used to cooperate with the lifting shell 8 as it moves downward, causing the material piled on the upper part of the protective shell 14 and the lifting shell 8 to lose support and become loose, thus facilitating the upward movement of the lifting shell 8 and the protective shell 14. Initially, the first spring 9 is not compressed, and the lifting shell 8 is located inside the protective shell 14. The first spring 9 is used to drive the lifting tube 7 to reset. Initially, the upper part of the protective shell 14 is flush with the upper side of the partition frame 3.

[0039] Furthermore, such as Figure 3 and Figure 10 As shown, the limiting assembly includes a limiting rod 21, which is slidably connected to the separator 3. A second spring 22 is fixed between the limiting rod 21 and the separator 3. A limiting groove 23 is provided on the return shell 1 in an axially distributed manner, which is used to limit the limiting rod 21.

[0040] Furthermore, such as Figure 3 and Figure 10 As shown, the end of the limiting rod 21 away from the partition frame 3 is a hemispherical head, and the depth of the axially distributed limiting groove 23 increases with the increase of the distance between it and the partition frame 3, and the depth of the limiting groove 23 is less than the radius of the upper hemispherical head of the limiting rod 21.

[0041] The above solution provides a method to make the partition frame 3 descend in a stepped manner by adjusting the limiting force during the descent of the partition frame 3. In this embodiment, the partition frame 3 is limited by limiting rods 21, and there are four limiting rods 21, which are evenly distributed on the side of the partition frame 3. The depth of the limiting groove 23 is less than the radius of the upper hemisphere of the limiting rod 21, so that the limiting rod 21 can be moved out of the limiting groove 23 by compression. The second spring 22 is always in a compressed state. The three limiting grooves 23 in the same column are called the first limiting groove 23, the second limiting groove 23 and the third limiting groove 23 from top to bottom.

[0042] Work process: During the operation of the fluidized bed boiler (hereinafter referred to as the boiler), after the material separated by the cyclone separator enters the return shell 1, the operator starts the air pump to deliver gas into the air storage pipe 4. The gas in the air storage pipe 4 enters the regulating pipe 6 through the first branch pipe 5. The gas pressure in the regulating pipe 6 increases, pushing the lifting pipe 7 to move upward. The lifting pipe 7 drives the lifting shell 8 to move upward and compress the first spring 9 until the first spring 9 can no longer be compressed. Then the lifting pipe 7 stops moving upward. During this process, the gas in the regulating pipe 6 enters the lifting shell 8 through the lifting pipe 7. Then it is discharged from the first exhaust hole on the lifting shell 8 and blows the material upward and enters the boiler through the pipe. Some of the coked material cannot be blown upward by the airflow blown out of the lifting shell 8 due to the increased gravity and is deposited on the side of the separator 3. Since the first exhaust hole of the lifting shell 8 is tilted upward, the probability of the material entering the gap between the lifting shell 8 and the protective shell 14 can be reduced when the material is blown.

[0043] As the amount of material accumulated on the separator 3 gradually increases, when the weight of the material on the separator 3 exceeds the sum of the limiting forces of the four first limiting grooves 23 on the four limiting rods 21, the limiting rods 21 enter the separator 3 and compress the second spring 22 until the limiting rods 21 separate from the first limiting grooves 23. Then the limiting rods 21 release their restriction on the separator 3, and the separator 3 moves downward quickly. After the limiting rods 21 align with the second limiting grooves 23, the limiting rods 21, pushed by the second spring 22, enter the second limiting grooves 23 and restrict the separator 3 again, causing the separator 3 to stop moving downward.

[0044] During the downward movement of the aforementioned separator 3, the separator 3 drives the adjusting block 13 to move downward quickly and compress the telescopic end of the telescopic rod 2. The air pump reduces the efficiency of delivering gas into the air storage pipe 4, causing the air pressure in the adjusting pipe 6 to decrease. The first spring 9 pushes the lifting pipe 7 to move downward and reset, causing the lifting pipe 7 to drive the lifting shell 8 to move downward and reset and enter the protective shell 14. The material on the upper side of the protective shell 14 and the lifting shell 8 loses support and becomes loose. Some of the loose material is blown up by the lifting shell 8 and moves to the surroundings until the first spring 9 resets, at which point the lifting shell 8 stops moving downward.

[0045] During the process of the aforementioned separator 3 driving the adjusting block 13 to move downward, the adjusting block 13 squeezes the adjacent ends of the L-shaped rod 12, causing the L-shaped rod 12 to rotate and push the lifting frame 10 upward. The adjacent lifting frames 10 move upward synchronously under the action of the connecting rod 11. At the same time, the lifting frame 10 drives the adjusting pipe 6 to move upward, and the adjusting pipe 6 drives the lifting pipe 7 and the protective shell 14 to move upward (at this time, the lifting shell 8 has entered the protective shell 14). The protective shell 14 moves upward rapidly and pushes the surrounding material to disperse by impact, reducing the degree of material accumulation around the lifting shell 8. At the same time, it reduces the amount of contact between the lifting shell 8 and the material during the upward movement, reducing the probability that the first exhaust hole on the lifting shell 8 will be blocked by the material during the upward movement.

[0046] When the movable partition frame 3 stops moving downwards, the upper part of the lifting shell 8 is higher than the upper side of the accumulated material. The adjusting block 13 stops moving, the L-shaped rod 12 stops rotating, and the lifting frame 10 no longer moves upwards. The air pump power is restored, causing the pressure in the adjusting pipe 6 to increase again. The lifting pipe 7 then drives the lifting shell 8 upwards again and compresses the first spring 9, causing the lifting shell 8 to extend out of the protective shell 14 again. Afterwards, when the weight of the material on the partition frame 3 is greater than the sum of the limiting forces of the four second limiting grooves 23 on the four limiting rods 21, the four limiting rods 21 release their support on the partition frame 3 again, causing the partition frame 3 to repeat the above process and descend, causing the height of the lifting shell 8 to rise again. When the boiler is no longer in use, the operating... The operator turns off the air pump and cleans the material accumulated on the partition frame 3. After the partition frame 3 is cleaned, the operator moves the partition frame 3 and its parts in the reverse direction to reset. The telescopic end of the telescopic rod 2 extends to reset. The partition frame 3 drives the L-shaped rod 12 to rotate in the reverse direction to reset through the adjusting block 13. The lifting frame 10 moves its parts downward to reset under the action of gravity. After the partition frame 3 moves to the initial position, the protective shell 14 contacts the partition frame 3 again. During this process, the four limiting rods 21 are repeatedly compressed by the second spring 22 under the action of the three adjacent limiting grooves 23 until the partition frame 3 is reset. Then the limiting rods 21 align with the first limiting groove 23 and enter it to complete the reset.

[0047] Furthermore, such as Figure 3 , Figure 4 and Figures 7-9As shown, it also includes a blowing assembly, which is disposed on the return shell 1. The blowing assembly is used to blow air from the bottom onto the ash and slag accumulated on the separator 3, reducing the amount of ash and slag accumulated on the upper side of the separator 3. The blowing assembly includes multiple air inlet pipes 401, which are disposed inside the return shell 1. All air inlet pipes 401 are arranged at intervals with all air storage pipes 4. The air inlet pipes 401 are fixedly connected to and connected to a second branch pipe 15. The second branch pipe 15 is slidably connected to and connected to a sealing pipe 16 that is slidably connected to the separator 3. A damping device is provided between the second branch pipe 15 and the sealing pipe 16. The sealing tube 16 is slidably connected to the fixed shell 17 which is rotatably connected to the separator 3, and a tension spring 18 is fixed between the two. The fixed shell 17 is provided with evenly distributed second exhaust holes. The upper part of the sealing tube 16 is provided with a circular plate, which is used to block the top second exhaust holes on the fixed shell 17. The sealing tube 16 is provided with a connecting hole that communicates with the fixed shell 17. The sealing tube 16 is provided with a rotating assembly, which is used to drive the fixed shell 17 to rotate and increase the range of ash and slag it blows when the fixed shell 17 blows the ash and slag accumulated on the separator 3.

[0048] The above solution provides a method to blow away the ash deposited on the partition frame 3 when adjusting the position of the lifting shell 8, thereby reducing the amount of ash accumulation on the partition frame 3. In this embodiment, there are five connecting rods 11 between two adjacent lifting frames 10. The second branch pipe 15 is arranged with the first branch pipe 5 at left and right intervals. The air inlet pipe 401 is connected to the air storage pipe 4. In this embodiment, a solenoid valve is installed in the first branch pipe 5, and it is initially in the open state. The solenoid valve is used to close when the partition frame 3 moves downward, so as to reduce the air pressure in the first branch pipe 5, thereby causing the first spring 9 to push the lifting shell 8 to move into the protective shell 14 to protect the lifting shell 8. The second branch pipe 15 is connected to the seal. The damping between the tubes 16 is used to increase the resistance to the movement of the sealing tube 16, so that there is relative movement between the separator 3 and the sealing tube 16. The connecting hole of the sealing tube 16 is located on its side and below the upper circular plate. The fixed shell 17 is used to blow gas onto the material accumulated on the separator 3, so that the small material accumulated due to the blockage of the first exhaust hole on the lifting shell 8 can be blown up again. The top and sides of the fixed shell 17 are both provided with second exhaust holes. The circular plate on the sealing tube 16 is used to block the second exhaust hole on the top of the fixed shell 17 and increase the exhaust volume of the second exhaust hole on the side of the fixed shell 17. The tension spring 18 is used to drive the sealing tube 16 to move downward.

[0049] Furthermore, such as Figure 7 and Figure 8As shown, the rotating assembly includes a rotating tube 19, which is slidably connected to an adjacent sealing tube 16. A second branch tube 15 is located on the moving path of the rotating tube 19. The rotating tube 19 is provided with a threaded groove 20. The rotating tube 19 is slidably connected to an adjacent connecting rod 11. A protrusion is provided on the connecting rod 11, and the protrusion of the connecting rod 11 slides within the threaded groove 20.

[0050] In the above scheme, when the top of the second branch pipe 15 contacts the bottom of the rotating pipe 19, it prevents the rotating pipe 19 from moving downward. The height of the threaded groove 20 on the rotating pipe 19 is greater than the distance the connecting rod 11 moves upward, so that the protrusion of the connecting rod 11 can drive the rotating pipe 19 to rotate.

[0051] Work process: During the normal process of the air pump supplying gas into the air storage pipe 4, the air pump simultaneously supplies gas into the air inlet pipe 401. The gas in the air inlet pipe 401 enters the sealing pipe 16 through the second branch pipe 15. Then, the gas enters the fixed shell 17 through the connecting hole on the sealing pipe 16, so that the gas is discharged through the second exhaust hole of the fixed shell 17 and blows the material upward.

[0052] During the downward movement of the aforementioned separator 3, the solenoid valve in the first branch pipe 5 closes, reducing the air pressure in the regulating pipe 6. The first spring 9 drives the lifting shell 8 into the protective shell 14 via the lifting pipe 7. The separator 3 drives the fixed shell 17 to move downward. The fixed shell 17 drives the sealing pipe 16 to move downward via the tension spring 18. At this time, the sealing pipe 16 moves downward slowly under the damping effect between itself and the second branch pipe 15, causing the separator 3 to drive the fixed shell 17 to move downward relative to the sealing pipe 16 and stretch the tension spring 18 until the upper side of the circular plate on the sealing pipe 16 contacts the fixed shell 17. The sealing pipe 16 then seals the second exhaust hole at the top of the fixed shell 17, allowing the fixed shell 17 to exhaust air only through the second exhaust hole on its side. This increases the impact force of the gas on the side of the fixed shell 17 on the outside, causing the small materials accumulated on the separator 3 to move upward again. At this time, the separator 3 directly squeezes the sealing pipe 16 through the fixed shell 17, causing the sealing pipe 16 to move downward synchronously. The rotating pipe 19 is pushed downward by the adjacent second branch pipe 15, and the sealing pipe 16 moves downward relative to the rotating pipe 19.

[0053] During the downward movement of the aforementioned separator 3, the L-shaped rod 12 drives the lifting frame 10 to move upward, and the lifting frame 10 drives the connecting rod 11 to move upward, causing the protrusion of the connecting rod 11 to drive the rotating tube 19 to rotate through the extrusion thread groove 20. The rotating tube 19 drives the fixed shell 17 to rotate through the sealing tube 16, adjusting the direction of the fixed shell 17, thereby increasing the area of ​​the fixed shell 17 for material movement. After the separator 3 stops moving downward, the lifting frame 10 stops moving downward, and the sealing tube 16 stops driving the fixed shell 17 to rotate. Then, under the action of the tension spring 18, the sealing tube 16 moves downward relative to the fixed shell 17, releasing the obstruction of the top through hole on the fixed shell 17. After the tension spring 18 returns to its original position, the sealing tube 16 stops moving, and the solenoid valve in the first branch pipe 5 opens again, causing the lifting shell 8 to protrude out of the protective shell 14 again. Then, during the downward movement of the separator 3, the sealing tube 16 repeats the above process to drive the fixed shell 17 to rotate.

[0054] After the material in the separator 3 is cleared, as the separator 3 moves upward, the separator 3 drives the sealing tube 16 and the fixed shell 17 to move upward and reset. During this process, the lifting frame 10 drives the connecting rod 11 to move downward and reset, so that the protrusion of the connecting rod 11 squeezes the threaded groove 20, thereby causing the sealing tube 16 to drive the fixed shell 17 to rotate in the opposite direction and reset. After the separator 3 is reset, the sealing tube 16 and its parts are reset.

[0055] Furthermore, such as Figure 2 , Figure 3 and Figures 10-12 As shown, it also includes a material-pulling assembly, which is set on the separator 3. The material-pulling assembly is used to move the ash and slag deposited on the separator 3, so as to loosen the accumulated ash and slag. The material-pulling assembly includes multiple rotating rods 24, which are rotatably connected to the separator 3. Multiple axially distributed corrugated claws 25 are fixed on the rotating rods 24. Corrugated frames 26 are fixed on the rotating rods 24 and are slidably connected to the separator 3. Several pairs of corrugated blocks 27, the same number as the rotating rods 24, are fixed on the return shell 1. The corrugated blocks 27 are used to squeeze adjacent corrugated frames 26, so that the corrugated frames 26 drive the rotating rods 24 to swing back and forth, and adjust the position of the gap between the ash and slag on the separator 3.

[0056] Furthermore, such as Figure 11 and Figure 12 As shown, the wave height of the corrugated block 27 increases as the distance between it and the separator 3 increases, which is used to gradually increase the amplitude of the swing of the corrugated frame 26.

[0057] In the above scheme, there are two rotating rods 24. The oscillating claw 25 is used to push the material upward during its swing, so as to loosen the material on the separator 3. The oscillating claw 25 is provided with symmetrically distributed inclined surfaces, which are used to reduce the resistance encountered by the oscillating claw 25 when it moves downward. The oscillating frame 26 is composed of vertical rods and elliptical blocks, and the corrugated surfaces of two adjacent corrugated blocks 27 are staggered, that is, the crest of one corrugated block 27 corresponds to the trough of another corrugated block 27. This is used to make the elliptical blocks of the oscillating frame 26 swing back and forth under the action of the corrugated surface of the corrugated block 27 during the downward movement of the oscillating frame 26. The change in the wave height of the corrugated block 27 is used to make the swing amplitude of the oscillating frame 26 increase with the increase of the thickness of the material piled on the separator 3.

[0058] Workflow: After the aforementioned limiting rod 21 separates from the adjacent limiting groove 23, the separator 3 moves downward under the weight of the material on it. The separator 3 drives the rotating rod 24 and the wave frame 26 to move downward, so as to... Figure 12 The direction of movement of the middle part is the reference direction. When the wave frame 26 contacts the corrugated surface of the right corrugated block 27, the wave frame 26 swings clockwise (viewed from front to back) under the pressure of the corrugated block 27. The wave frame 26 drives the wave claw 25 to swing through the rotating rod 24, causing the wave claw 25 to push the surrounding material to move, thereby loosening the material accumulated on the separator 3. During this process, the rotating tube 19 drives the fixed shell 17 to rotate through the sealing tube 16, thereby facilitating the movement of the fine material deposited on the separator 3 by the fixed shell 17. When the wave frame 26 moves to the position of the wave crest adjacent to the right corrugated block 27, the wave frame 26 no longer swings clockwise. The moving frame 26 contacts the corrugated surface of the left corrugated block 27, causing the wave frame 26 to swing counterclockwise under the action of the left corrugated block 27. This causes the wave claw 25 to push the material in the opposite direction, further changing the position of the material. This continues until the limiting rod 21 enters the next limiting groove 23, at which point the separator 3 stops moving and the wave frame 26 stops swinging. When the separator 3 moves downward again, the wave frame 26 repeats the above process, causing the wave claw 25 to swing. When the separator 3 returns to its original position, the separator 3 drives the wave frame 26 to move upward and return to its original position via the rotating rod 24. The wave frame 26 swings in the opposite direction under the action of the two adjacent corrugated blocks 27 until it completes its return to its original position.

[0059] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A return ash discharge device for a fluidized bed boiler, characterized in that it includes: There is a return material shell (1), and a telescopic rod (2) is fixedly connected inside the return material shell (1). The telescopic end of the telescopic rod (2) is fixedly connected to a partition frame (3) that is slidably connected to the return material shell (1). Multiple air storage pipes (4) are provided inside the return material shell (1). Multiple first branch pipes (5) are fixedly connected and connected to the air storage pipes (4). The first branch pipes (5) are slidably connected and connected to an adjusting pipe (6). The adjusting pipe (6) is slidably connected to the partition frame (3). The adjusting pipe (6) is slidably connected and connected to a lifting pipe (7). A first spring (9) is fixedly connected between the two. The lifting pipe (7) is fixedly connected to and connected to the lifting shell (8). The lifting shell (8) is provided with a uniformly distributed first exhaust hole. The corresponding regulating pipe (6) on the same air storage pipe (4) is fixedly connected to the lifting frame (10). Multiple connecting rods (11) are fixedly connected between adjacent lifting frames (10). The return shell (1) is provided with a power component for driving the lifting shell (8) to move upward away from the accumulated ash and slag in stages after the ash and slag have accumulated. The partition frame (3) is provided with a limiting component for causing the partition frame (3) to descend in stages.

2. The return ash discharge device for a fluidized bed boiler according to claim 1, characterized in that, The power assembly includes symmetrically distributed L-shaped rods (12), the middle of which is hinged to the return shell (1). The L-shaped rods (12) are used to push the lifting frame (10) to move upward. An adjusting block (13) is hinged to one end of the L-shaped rods (12) near the partition frame (3). The adjusting block (13) is slidably connected to the partition frame (3).

3. The return ash discharge device for a fluidized bed boiler according to claim 2, characterized in that, The regulating tube (6) is fixedly connected to a protective shell (14), and the protective shell (14) is in contact with the partition frame (3).

4. The return ash discharge device for a fluidized bed boiler according to claim 3, characterized in that, The protective shell (14) is trumpet-shaped. The diameter of the protective shell (14) increases as its distance from the regulating tube (6) increases, and the minimum inner diameter of the protective shell (14) is greater than the maximum diameter of the lifting shell (8).

5. A return ash discharge device for a fluidized bed boiler according to claim 2, characterized in that, The limiting component includes a limiting rod (21), which is slidably connected to the separator (3). A second spring (22) is fixed between the limiting rod (21) and the separator (3). The return shell (1) is provided with axially distributed limiting grooves (23), which are used to limit the limiting rod (21).

6. The fluidized bed boiler return ash discharge device according to claim 5, characterized in that, The end of the limiting rod (21) away from the partition frame (3) is a hemispherical head. The depth of the limiting groove (23) which is axially distributed increases with the distance between it and the partition frame (3), and the depth of the limiting groove (23) is less than the radius of the hemispherical head of the limiting rod (21).

7. A return ash discharge device for a fluidized bed boiler according to claim 5, characterized in that, It also includes a blowing assembly, which is disposed on the return shell (1). The blowing assembly is used to blow air from the bottom onto the ash and slag accumulated on the partition frame (3) to reduce the amount of ash and slag accumulated on the upper side of the partition frame (3). The blowing assembly includes multiple air inlet pipes (401), which are disposed inside the return shell (1). All the air inlet pipes (401) are arranged at intervals with all the air storage pipes (4). The air inlet pipes (401) are fixedly connected to and connected to a second branch pipe (15). The second branch pipe (15) is slidably connected to and connected to a sealing pipe (16) slidably connected to the partition frame (3). A space is provided between the second branch pipe (15) and the sealing pipe (16). The sealing tube (16) is slidably connected to a fixed shell (17) that is rotatably connected to the partition frame (3), and a tension spring (18) is fixed between them. The fixed shell (17) is provided with evenly distributed second exhaust holes. A circular plate is provided on the upper part of the sealing tube (16), which is used to block the top second exhaust holes on the fixed shell (17). The sealing tube (16) is provided with a connecting hole that communicates with the fixed shell (17). A rotating component is provided on the sealing tube (16), which is used to drive the fixed shell (17) to rotate and increase the range of ash and slag it blows when the fixed shell (17) blows the ash and slag gathered on the partition frame (3).

8. A return ash discharge device for a fluidized bed boiler according to claim 7, characterized in that, The rotating assembly includes a rotating tube (19) which is slidably connected to the adjacent sealing tube (16). The second branch tube (15) is located on the moving path of the rotating tube (19). The rotating tube (19) is provided with a threaded groove (20). The rotating tube (19) is slidably connected to the adjacent connecting rod (11). The connecting rod (11) is provided with a protrusion, and the protrusion of the connecting rod (11) slides in the threaded groove (20).

9. A return ash discharge device for a fluidized bed boiler according to claim 7, characterized in that, It also includes a material-pulling assembly, which is disposed on the partition frame (3). The material-pulling assembly is used to move the ash deposited on the partition frame (3) to loosen the accumulated ash. The material-pulling assembly includes multiple rotating rods (24), which are rotatably connected to the partition frame (3). Multiple axially distributed wave claws (25) are fixed on the rotating rods (24). Wave frames (26) are fixed on the rotating rods (24) and are slidably connected to the partition frame (3). Several pairs of corrugated blocks (27) are fixed on the return shell (1) in the same number as the rotating rods (24). The corrugated blocks (27) are used to squeeze the adjacent wave frames (26) so that the wave frames (26) drive the rotating rods (24) to swing back and forth, adjusting the position of the gap between the ash on the partition frame (3).

10. A return ash discharge device for a fluidized bed boiler according to claim 9, characterized in that, The wave height of the corrugated block (27) increases as the distance between it and the separator (3) increases, thereby gradually increasing the amplitude of the swing of the corrugated frame (26).

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