Return ash discharging device for fluidized bed boiler

Abstract

The invention discloses a material returning ash discharging device for a fluidized bed boiler, and belongs to the technical field of boiler material returning devices. Comprising a material returning shell, a telescopic rod is fixedly connected in the material returning shell, the telescopic end of the telescopic rod is fixedly connected with a separation frame slidably connected with the material returning shell, a plurality of air storage pipes are arranged in the material returning shell, the air storage pipes are fixedly connected and communicated with a plurality of first branch pipes, and the first branch pipes are slidably connected and communicated with adjusting pipes. The adjusting pipes are slidably connected and communicated with lifting pipes, the lifting pipes are fixedly connected and communicated with lifting shells, the corresponding adjusting pipes on the same air storage pipe are jointly and fixedly connected with lifting frames, and a plurality of connecting rods are jointly and fixedly connected between the adjacent lifting frames. By adjusting the position of the lifting shell, the lifting shell moves to the upper portion of stacked materials, the shielding area of the stacked materials on the first exhaust holes in the lifting shell is reduced, and therefore it is guaranteed that the total amount of materials conveyed into the boiler is in a stable state.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler return devices, and particularly to a return ash discharge device for a fluidized bed boiler. Background Art

[0002] A fluidized bed boiler is a highly efficient combustion device widely used in the fields of power generation, heating, and industrial boilers. Its core technology is to precisely control the air flow velocity to make solid particles reach a fluidized state, thereby significantly improving the combustion efficiency. According to the type of fuel, the 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 popularization of the application of renewable fuels, compressed biomass particles have gradually become one of the mainstream fuel types due to their high calorific value and low pollution characteristics.

[0003] During the actual operation process, the returner equipped in the fluidized bed boiler can send the unburned biomass particles and ash back to the furnace, enabling the unburned biomass particles to continue to participate in combustion. During this process, the ash will absorb part of the heat generated during the combustion of the biomass particles, keeping the temperature inside the boiler stable.

[0004] However, when the returner processes compressed biomass particles, since the biomass particles themselves contain relatively high volatile components and alkali metal components, the unburned residues mixed with the ash are more likely to aggregate due to softening at high temperatures, forming a dense coking body. Coking not only causes the abnormal expansion of the particle volume but also significantly increases the return resistance. That is, some coked particles deposit inside the returner due to insufficient power and gradually cover the tuyere area, weakening the fluidization effect of the air flow on the settling particles, resulting in a decrease in the return efficiency from the returner to the furnace, and further causing problems such as uneven distribution of the temperature field inside the furnace and incomplete combustion of biomass particles, ultimately threatening the stability of the overall operation of the boiler. Summary of the Invention

[0005] The present invention provides a return ash discharge device for a fluidized bed boiler to overcome the problem that the total amount of ash discharged from the returner to the boiler is affected after the settling particles accumulate inside the returner.

[0006] The technical solution of the present invention is as follows: A return ash discharge device for a fluidized bed boiler, including a return shell, in which a telescopic rod is fixedly connected. The telescopic end of the telescopic rod is fixedly connected with a partition frame that is slidably connected to the return shell. A plurality of air storage pipes are arranged in the return shell. The air storage pipes are fixedly connected and communicated with a plurality of first branch pipes. The first branch pipes are slidably connected and communicated with an adjustment pipe. The adjustment pipe is slidably connected to the partition frame. The adjustment pipe is slidably connected and communicated with a lifting pipe, and a first spring is fixedly connected between the two. The lifting pipe is fixedly connected and communicated with a lifting shell. The lifting shell is provided with uniformly distributed first exhaust holes. The adjustment pipes corresponding to the same air storage pipe are jointly fixedly connected with a lifting frame. A plurality of connecting rods are jointly fixedly connected between adjacent lifting frames. A power component is arranged on the return shell for periodically driving the lifting shell to move upward away from the accumulated ash after the ash accumulates. A limiting component is arranged on the partition frame for making the partition frame descend periodically.

[0007] Further explanation, the power component includes L-shaped rods symmetrically distributed. The middle of the L-shaped rod is hinged to the return shell. The L-shaped rod is used to push the lifting frame upward. One end of the L-shaped rod close to the partition frame is hinged with an adjustment block, and the adjustment block is slidably connected to the partition frame.

[0008] Further explanation, the adjustment pipe is fixedly connected with a protective shell, and the protective shell is in contact with the partition frame.

[0009] Further explanation, the protective shell is in a horn shape. The diameter of the protective shell increases with the increase of its distance from the adjustment pipe, and the minimum inner diameter of the protective shell is greater than the maximum diameter of the lifting shell.

[0010] Further explanation, the limiting component includes a limiting rod. The limiting rod is slidably connected to the partition frame. A second spring is fixedly connected between the limiting rod and the partition frame. The return shell is provided with an axially distributed limiting groove for limiting the limiting rod.

[0011] Further explanation, one end of the limiting rod away from the partition frame is a hemispherical head. The depth of the axially distributed limiting groove increases with the increase of its distance from the partition frame, and the depth of the limiting groove is less than the radius of the hemispherical head on the limiting rod.

[0012] Further explanation is as follows. It further includes a blowing component, which is arranged on the return material shell. The blowing component is used to blow air at the slag accumulated on the partition rack from the bottom, reducing the amount of slag accumulated on the upper side of the partition rack. The blowing component includes a plurality of air inlet pipes, which are arranged in the return material shell. All the air inlet pipes and all the air storage pipes are arranged at intervals. The air inlet pipe is fixedly connected and communicated with a second branch pipe. The second branch pipe is slidably connected and communicated with a sealing pipe that is slidably connected with the partition rack. A damping is arranged between the second branch pipe and the sealing pipe. The sealing pipe is slidably connected with a fixed shell that is rotatably connected with the partition rack, and a tension spring is fixedly connected between the two. The fixed shell is provided with uniformly distributed second exhaust holes. The upper part of the sealing pipe is provided with a circular plate, which is used to block the top second exhaust holes on the fixed shell. The sealing pipe is provided with a communication hole that is communicated with the fixed shell. The sealing pipe is provided with a rotating component, which is used to drive the fixed shell to rotate and increase the range of blowing slag when the fixed shell blows the slag accumulated on the partition rack.

[0013] Further explanation is as follows. The rotating component includes a rotating pipe, which is slidably connected to the adjacent sealing pipe. The second branch pipe is located on the moving path of the rotating pipe. The rotating pipe is provided with a threaded groove. The rotating pipe is slidably connected with the adjacent connecting rod. The connecting rod is provided with a convex block, and the convex block of the connecting rod slides in the threaded groove.

[0014] Further explanation is as follows. It further includes a material dialing component, which is arranged on the partition rack. The material dialing component is used to drive the slag deposited on the partition rack to move, making the accumulated slag loose. The material dialing component includes a plurality of rotating rods, and all the rotating rods are rotatably connected to the partition rack. A plurality of wave claws distributed axially are fixedly connected to the rotating rod. The rotating rod is fixedly connected with a wave rack, and the wave rack is slidably connected with the partition rack. A plurality of pairs of corrugated blocks with the same number as the rotating rods are fixedly connected to the return material shell. The corrugated blocks are used to squeeze the adjacent wave racks, so that the wave racks drive the rotating rods to swing reciprocally, adjusting the position of the gaps between the slag on the partition rack.

[0015] Further explanation is as follows. The wave height of the corrugated block increases with the increase of the distance between it and the partition rack, which is used to gradually increase the swinging amplitude of the wave rack.

[0016] Compared with the prior art, the present invention has the following advantages: 1. After material accumulation appears on the upper side of the partition rack in the present invention, by adjusting the position of the lifting shell, the lifting shell is moved to the upper part of the accumulated material, reducing the shielding area of the first exhaust holes on the lifting shell by the accumulated material, so as to ensure that the total amount of material conveyed into the boiler is in a stable state.

[0017] 2. During the process of the present invention blowing the piled materials from the bottom of the fixed shell, the second exhaust hole at the top of the fixed shell is blocked by the sealing pipe, increasing the air outlet volume of the second exhaust hole on the side of the fixed shell. At the same time, the fixed shell is driven by the rotating pipe to adjust the angle, improving the blowing effect of the fixed shell on the fine materials in the piled materials.

[0018] 3. The present invention limits the partition frame through the cooperation of the limiting rod and the limiting groove. After the limiting rod releases the limit on the partition frame, the partition frame quickly descends, increasing the upward movement speed of the protective shell. The protective shell pushes the deposited materials by impact, making the deposited materials further away from the lifting shell. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

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

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

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

[0027] Figure 9 is a three-dimensional structural schematic diagram of the sealing pipe, the fixed shell and the tension spring of the present invention;

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

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

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

[0031] The markings of each component in the drawings are as follows: 1 - return material shell, 2 - telescopic rod, 3 - partition frame, 4 - air storage pipe, 401 - intake pipe, 5 - first branch pipe, 6 - adjusting pipe, 7 - lifting pipe, 8 - lifting shell, 9 - first spring, 10 - lifting frame, 11 - connecting rod, 12 - L-shaped rod, 13 - adjusting block, 14 - protective shell, 15 - second branch pipe, 16 - sealing pipe, 17 - fixed shell, 18 - tension spring, 19 - rotating pipe, 20 - thread groove, 21 - limiting rod, 22 - second spring, 23 - limiting groove, 24 - rotating rod, 25 - undulating claw, 26 - undulating frame, 27 - corrugated block. Detailed implementation manners

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] A return ash discharge device for a fluidized bed boiler, as Figures 1 - 6 shown, includes a return material shell 1, a telescopic rod 2 is fixedly connected inside the return material shell 1, a partition frame 3 slidably connected to the return material shell 1 is fixedly connected to the telescopic end of the telescopic rod 2, a plurality of air storage pipes 4 are arranged inside the return material shell 1, the air storage pipes 4 are fixedly connected and communicated with a plurality of first branch pipes 5, the first branch pipes 5 are slidably connected and communicated with an adjusting pipe 6, the adjusting pipe 6 is slidably connected to the partition frame 3, the adjusting pipe 6 is slidably connected and communicated with a lifting pipe 7, and a first spring 9 is fixedly connected between the two. The lifting pipe 7 is fixedly connected and communicated with a lifting shell 8, and a uniformly distributed first exhaust hole is arranged on the lifting shell 8. The adjusting pipes 6 corresponding to the same air storage pipe 4 are jointly fixedly connected to a lifting frame 10, and a plurality of connecting rods 11 are jointly fixedly connected between adjacent lifting frames 10. A power assembly is arranged on the return material shell 1 for periodically driving the lifting shell 8 to move upward away from the accumulated ash after the ash accumulates, and a limiting assembly is arranged on the partition frame 3 for making the partition frame 3 descend periodically.

[0034] The above solution provides a method in the process of returning materials to the boiler. When ash and slag accumulate on the partition frame 3, the lifting shell 8 is driven to move upward to increase the distance between it and the ash and slag, thereby reducing the shielding area of the first exhaust holes on the lifting shell 8 by the ash and slag. In this embodiment, the upper part of the return shell 1 is connected to the cyclone separator in the boiler system, and is used to enable the cyclone separator to send the unburned particles and ash and slag separated into the return shell 1 (the mixture of unburned particles and ash and slag is hereinafter referred to as materials). The left part of the return shell 1 is connected to the fluidized bed boiler, and is used to enable the return shell 1 to convey the materials therein to the fluidized bed boiler. Both the fluidized bed boiler and the cyclone separator are existing devices and are not shown in the drawings. There are two telescopic rods 2 symmetrically distributed left and right in the return shell 1, and the two telescopic rods 2 are used to increase the stability when the partition frame 3 moves. The partition frame 3 divides the return shell 1 into upper and lower chambers. The upper chamber of the return shell 1 is used for the materials to pass through. In this embodiment, the adjacent air storage pipes 4 are interconnected, the air storage pipes 4 are connected to an external air pump, and one air storage pipe 4 has five first branch pipes 5. The first exhaust holes of the lifting shell 8 are all inclined upward from its interior, and are used to make the air blown out by the lifting shell 8 blow the materials upward.

[0035] Further, as Figure 2 and Figure 3 shown, the power assembly includes L-shaped rods 12 symmetrically distributed. The middle of the L-shaped rod 12 is hinged to the return shell 1. The L-shaped rod 12 is used to push the lifting frame 10 upward. One end of the L-shaped rod 12 close to the partition frame 3 is hinged with an adjusting block 13, and the adjusting block 13 is slidably connected to the partition frame 3.

[0036] Further, as Figures 4 - 6 shown, the adjusting pipe 6 is fixedly connected with a protective shell 14, and the protective shell 14 contacts the partition frame 3.

[0037] Further, as Figure 5 and Figure 6 shown, the protective shell 14 is trumpet-shaped, the diameter of the protective shell 14 increases as the distance from the adjusting pipe 6 increases, and the minimum inner diameter of the protective shell 14 is greater than the maximum diameter of the lifting shell 8.

[0038] In the above solution, 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. During the downward movement of the partition frame 3, the distance of the movement of the partition frame 3 is amplified by the L-shaped rod 12, so as to increase the upward movement distance of the lifting frame 10. A guide groove is provided in the partition frame 3, and the adjustment block 13 is located in the guide groove of the partition frame 3 and slides. The protective shell 14 is used to cooperate with the lifting shell 8 during the downward movement of the lifting shell 8, so that the materials accumulated on the upper part of the protective shell 14 and the lifting shell 8 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 surface of the partition frame 3.

[0039] Further, as Figure 3 and Figure 10 shown, the limiting component includes a limiting rod 21. The limiting rod 21 is slidably connected to the partition frame 3. A second spring 22 is fixedly connected between the limiting rod 21 and the partition frame 3. The return material shell 1 is provided with limiting grooves 23 distributed axially. The limiting grooves 23 are used to limit the limiting rod 21.

[0040] Further, as Figure 3 and Figure 10 shown, one end of the limiting rod 21 away from the partition frame 3 is a hemispherical head. The depth of the axially distributed limiting grooves 23 increases with the increase of the distance between them and the partition frame 3, and the depth of the limiting grooves 23 is less than the radius of the hemispherical head on the limiting rod 21.

[0041] The above solution provides a method of making the partition frame 3 descend step by step by adjusting the limiting force received during the descent of the partition frame 3. In this embodiment, the partition frame 3 is limited by the limiting rod 21, and the number of the limiting rods 21 is four, which are evenly distributed on the side surface of the partition frame 3. The depth of the limiting grooves 23 is less than the radius of the hemispherical head on the limiting rod 21, so that the limiting rod 21 can be moved out of the limiting grooves 23 by extrusion. The second spring 22 is always in a compressed state. Among the three limiting grooves 23 in the same column, the top one is called the first limiting groove 23, the middle one is called the second limiting groove 23, and the bottom one is called the third limiting groove 23 from top to bottom.

[0042] Workflow: During the operation of a fluidized bed boiler (hereinafter referred to as the boiler), after the materials separated by the cyclone separator enter the return material shell 1, the staff starts the air pump to transport 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 increased air pressure in the regulating pipe 6 pushes 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 cannot be compressed anymore, and 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, and then is discharged through the first exhaust hole on the lifting shell 8 to blow the materials upward and enter the boiler through the pipeline. Among them, after some of the coked materials increase in gravity, they cannot be blown upward by the airflow discharged from the lifting shell 8 and deposit on the upper side of the partition frame 3. Since the first exhaust hole of the lifting shell 8 is inclined upward, when blowing the materials to move, the probability of the materials entering the gap between the lifting shell 8 and the protective shell 14 can be reduced.

[0043] As the amount of materials accumulated on the partition frame 3 gradually increases, when the weight of the materials on the partition frame 3 is greater than 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 partition frame 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 the limitation on the partition frame 3, and the partition frame 3 quickly moves downward. After the limiting rods 21 are aligned with the second limiting grooves 23, the limiting rods 21 enter the second limiting grooves 23 under the push of the second spring 22 to limit the partition frame 3 again, so that the partition frame 3 stops moving downward.

[0044] During the downward movement of the partition frame 3 mentioned above, the partition frame 3 drives the regulating block 13 to move downward quickly and compress the telescopic end of the telescopic rod 2. The air pump reduces the efficiency of transporting gas into the air storage pipe 4, so that the air pressure in the regulating pipe 6 decreases. The first spring 9 pushes the lifting pipe 7 to move downward to reset, so that the lifting pipe 7 drives the lifting shell 8 to move downward to reset and enter the protective shell 14. The materials on the upper side of the protective shell 14 and the lifting shell 8 lose support and become loose, and some of the loose materials are blown up by the lifting shell 8 and move around until the first spring 9 is reset, and then the lifting shell 8 stops moving downward.

[0045] During the process of the above-mentioned partition frame 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 disperses the surrounding materials by means of impact, reducing the degree of material accumulation around the lifting shell 8. At the same time, the contact amount between the lifting shell 8 and the materials during the upward movement of the lifting shell 8 is reduced, and the probability that the first exhaust holes on the lifting shell 8 are blocked by the materials during the upward movement of the lifting shell 8 is lowered.

[0046] After the moving partition frame 3 stops moving downward, the upper part of the lifting shell 8 is higher than the upper side of the accumulated materials. The adjusting block 13 stops moving, the L-shaped rod 12 stops rotating, and the lifting frame 10 no longer moves upward. The power of the air pump resumes, increasing the pressure in the adjusting pipe 6 again. The lifting pipe 7 drives the lifting shell 8 to move upward again and compresses the first spring 9, causing the lifting shell 8 to protrude from the protective shell 14 again. After that, when the weight of the materials 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 the support for the partition frame 3 again, causing the partition frame 3 to repeat the above process and descend, increasing the height of the lifting shell 8 again. When the boiler stops being used, the staff turns off the air pump and cleans the materials accumulated on the partition frame 3. After the partition frame 3 is cleaned, the staff drives the partition frame 3 and its parts thereon to move reversely and reset. The telescopic end of the telescopic rod 2 extends and resets. The partition frame 3 drives the L-shaped rod 12 to rotate reversely and reset through the adjusting block 13. The lifting frame 10 drives the parts thereon to move downward and reset under the action of gravity until the partition frame 3 moves to the initial position. At this time, the protective shell 14 contacts the partition frame 3 again. During this process, the four limiting rods 21 repeatedly compress the second spring 22 under the action of the adjacent three limiting grooves 23 respectively until the partition frame 3 is reset. The limiting rod 21 aligns with the first limiting groove 23 and enters it to complete the reset.

[0047] Further, as Figure 3 、 Figure 4 and Figures 7 - 9As shown in the figure, it further includes a blowing component, which is arranged on the return material shell 1. The blowing component is used to blow air from the bottom to the slag accumulated on the partition rack 3, reducing the amount of slag accumulated on the upper side of the partition rack 3. The blowing component includes a plurality of air inlet pipes 401, which are arranged in the return material shell 1. All the air inlet pipes 401 and all the air storage pipes 4 are arranged at intervals. The air inlet pipe 401 is fixedly connected and communicated with a second branch pipe 15. The second branch pipe 15 is slidably connected and communicated with a sealing pipe 16 that is slidably connected with the partition rack 3. A damping is provided between the second branch pipe 15 and the sealing pipe 16. The sealing pipe 16 is slidably connected with a fixed shell 17 that is rotatably connected with the partition rack 3, and a tension spring 18 is fixedly connected between the two. The fixed shell 17 is provided with uniformly distributed second exhaust holes. The upper part of the sealing pipe 16 is provided with a circular plate, which is used to block the top second exhaust holes on the fixed shell 17. The sealing pipe 16 is provided with a communication hole that is communicated with the fixed shell 17. The sealing pipe 16 is provided with a rotating component, which is used to drive the fixed shell 17 to rotate and increase the range of blowing the slag when the fixed shell 17 blows the slag accumulated on the partition rack 3.

[0048] The above solution provides a way to blow the slag deposited on the partition rack 3 when adjusting the position of the lifting shell 8, reducing the amount of slag accumulated on the partition rack 3. In this embodiment, the number of connecting rods 11 between two adjacent lifting frames 10 is five. The second branch pipe 15 and the first branch pipe 5 are arranged at left and right intervals. The air inlet pipe 401 is communicated with the air storage pipe 4. In this embodiment, a solenoid valve is arranged in the first branch pipe 5, and it is in an open state initially. The solenoid valve is used to close when the partition rack 3 moves downward, reducing the air pressure in the first branch pipe 5, so that the first spring 9 pushes the lifting shell 8 to move into the protective shell 14 to protect the lifting shell 8. The damping between the second branch pipe 15 and the sealing pipe 16 is used to increase the resistance of the sealing pipe 16 to move, causing relative movement between the partition rack 3 and the sealing pipe 16. The communication hole of the sealing pipe 16 is located on its side and below the circular plate on it. The fixed shell 17 is used to blow gas to the materials accumulated on the partition rack 3, so that the fine materials accumulated due to the occlusion of the first exhaust holes on the lifting shell 8 can be blown up again. The second exhaust holes are distributed on both the top and the side of the fixed shell 17. The circular plate on the sealing pipe 16 is used to block the second exhaust holes on the top of the fixed shell 17, increasing the exhaust volume of the second exhaust holes on the side of the fixed shell 17. The tension spring 18 is used to drive the sealing pipe 16 to move downward.

[0049] Further, as Figure 7 and Figure 8As shown in the figure, the rotating assembly includes a rotating tube 19, the rotating tube 19 is slidably connected to the adjacent sealing tube 16, the second branch pipe 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, and a convex block is provided on the connecting rod 11. The convex block of the connecting rod 11 slides in the threaded groove 20.

[0050] In the above solution, when the top of the second branch pipe 15 contacts the bottom of the rotating tube 19, the downward movement of the rotating tube 19 is blocked. The height of the threaded groove 20 on the rotating tube 19 is greater than the upward movement distance of the connecting rod 11, so that the convex block of the connecting rod 11 can drive the rotating tube 19 to rotate.

[0051] Working process: During the normal process of the air pump delivering gas into the air storage pipe 4, the air pump simultaneously delivers 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, and then the gas enters the fixed housing 17 through the communication hole on the sealing pipe 16, so that the gas is discharged through the second exhaust hole of the fixed housing 17 and blows the material upward.

[0052] During the downward movement of the above-mentioned partition frame 3, the solenoid valve in the first branch pipe 5 is closed, reducing the air pressure in the regulating pipe 6. The first spring 9 drives the lifting shell 8 into the protective shell 14 through the lifting pipe 7. The partition frame 3 drives the fixed housing 17 to move downward. The fixed housing 17 drives the sealing pipe 16 to move downward through the tension spring 18. At this time, the sealing pipe 16 slowly moves downward under the action of the damping between it and the second branch pipe 15, so that the partition frame 3 drives the fixed housing 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 housing 17. Then, the sealing pipe 16 seals the second exhaust hole at the top of the fixed housing 17, so that the fixed housing 17 can only exhaust gas through the second exhaust hole on its side, increasing the impact force of the gas on the side of the fixed housing 17 on the outside, making the fine materials accumulated on the partition frame 3 move upward again. At this time, the partition frame 3 directly presses the sealing pipe 16 through the fixed housing 17, causing the sealing pipe 16 to move downward synchronously. The rotating tube 19 is blocked by the adjacent second branch pipe 15 and moves downward, and the sealing pipe 16 moves downward relative to the rotating tube 19.

[0053] During the downward movement of the above-mentioned partition frame 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, so that the convex block of the connecting rod 11 drives the rotating tube 19 to rotate by squeezing the threaded groove 20. The rotating tube 19 drives the fixed shell 17 to rotate through the sealing tube 16, adjusts the direction of the fixed shell 17, thereby increasing the area where the fixed shell 17 blows the material to move. Until the partition frame 3 stops moving downward, the lifting frame 10 stops moving downward, and the sealing tube 16 stops driving the fixed shell 17 to rotate. After that, the sealing tube 16 moves downward relative to the fixed shell 17 under the drive of the tension spring 18, releasing the occlusion of the top through hole on the fixed shell 17. Until the tension spring 18 is reset, the sealing tube 16 stops moving, and the solenoid valve in the first branch pipe 5 is opened again, so that the lifting shell 8 protrudes from the protective shell 14 again. After that, during the downward movement of the partition frame 3, the sealing tube 16 repeats the above process to drive the fixed shell 17 to rotate.

[0054] When the material cleaning of the partition frame 3 is completed, as the partition frame 3 moves upward, the partition frame 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 convex block of the connecting rod 11 squeezes the threaded groove 20, thereby driving the fixed shell 17 to rotate reversely and reset by the sealing tube 16. Until the partition frame 3 is reset, the sealing tube 16 and its components are reset.

[0055] Further, as Figure 2 , Figure 3 and Figures 10 - 12 shown, it further includes a material dialing component. The material dialing component is arranged on the partition frame 3 and is used to drive the ash slag deposited on the partition frame 3 to move, making the accumulated ash slag loose. The material dialing component includes a plurality of rotating rods 24. The plurality of rotating rods 24 are all rotatably connected to the partition frame 3. A plurality of wave claws 25 distributed axially are fixedly connected to the rotating rod 24. A wave frame 26 is fixedly connected to the rotating rod 24. The wave frame 26 is slidably connected to the partition frame 3. A plurality of pairs of corrugated blocks 27 with the same number as the rotating rods 24 are fixedly connected to the return material shell 1. 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 reciprocally, adjusting the position of the gap between the ash slag on the partition frame 3.

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

[0057] In the above solution, the number of the rotating rods 24 is two. The fluctuating claws 25 are used to push the materials to move upward during their swinging process, so as to loosen the materials on the partition frame 3. The fluctuating claws 25 are provided with symmetrically distributed inclined surfaces, which are used to reduce the resistance received by the fluctuating claws 25 when they move downward. The fluctuating frame 26 is composed of a vertical rod and an elliptical block, and the corrugated surfaces of two adjacent corrugated blocks 27 are arranged in a staggered manner, that is, the wave crest of one corrugated block 27 corresponds to the wave trough of the other corrugated block 27, so that during the downward movement of the fluctuating frame 26, the elliptical block of the fluctuating frame 26 swings reciprocally under the action of the corrugated surface of the corrugated block 27. The change in the wave height of the corrugated block 27 is used to make the swinging amplitude of the fluctuating frame 26 increase with the increase of the thickness of the accumulated materials on the partition frame 3.

[0058] Working process: After the above-mentioned limiting rod 21 is separated from the adjacent limiting groove 23, the partition frame 3 moves downward under the action of the gravity of the materials thereon. The partition frame 3 drives the rotating rod 24 and the fluctuating frame 26 to move downward, so as to Figure 12 take the moving direction of the parts in it as the reference direction. When the fluctuating frame 26 contacts the corrugated surface of the right corrugated block 27, the fluctuating frame 26 swings clockwise (viewed from front to back) under the extrusion of the corrugated block 27. The fluctuating frame 26 drives the fluctuating claws 25 to swing through the rotating rod 24, so that the fluctuating claws 25 push the surrounding materials to move, thereby loosening the accumulated materials on the partition frame 3. During this process, the rotating tube 19 drives the fixed shell 17 to rotate through the sealing tube 16, so as to facilitate the fixed shell 17 to blow the fine materials deposited on the partition frame 3 to move. When the fluctuating frame 26 moves to the wave crest position adjacent to the right corrugated block 27, the fluctuating frame 26 no longer swings clockwise. The fluctuating frame 26 contacts the corrugated surface of the left corrugated block 27, so that the fluctuating frame 26 swings counterclockwise under the action of the left corrugated block 27, so that the fluctuating claws 25 push the materials to move in the opposite direction, further changing the position of the materials. Until the limiting rod 21 extends into the next limiting groove 23, the partition frame 3 stops moving and the fluctuating frame 26 stops swinging. When the partition frame 3 moves downward again, the fluctuating frame 26 drives the fluctuating claws 25 to swing repeatedly through the above process. When the partition frame 3 resets upward, the partition frame 3 drives the fluctuating frame 26 to move upward and reset through the rotating rod 24. The fluctuating frame 26 swings in the opposite direction under the action of two adjacent corrugated blocks 27 until it completes the reset.

[0059] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A return ash discharge device for a fluidized bed boiler, characterized in that it comprises A return shell (1) is provided, a telescopic rod (2) is fixedly connected inside the return shell (1), a telescopic end of the telescopic rod (2) is fixedly connected to a partition frame (3) slidably connected to the return shell (1), a plurality of air storage pipes (4) are arranged inside the return shell (1), the air storage pipes (4) are fixedly connected to and connected to a plurality of first branch pipes (5), the first branch pipes (5) are slidably connected and connected to an adjustment pipe (6), the adjustment pipe (6) is slidably connected to the partition frame (3), the adjustment pipe (6) is slidably connected and connected to a lifting pipe (7), and a first spring (9) is fixedly connected between the two. ), the lifting pipe (7) is fixedly connected to and communicated with a lifting shell (8), the lifting shell (8) is provided with evenly distributed first exhaust holes, the corresponding regulating pipes (6) on the same air storage pipe (4) are commonly fixedly connected to a lifting frame (10), and a plurality of connecting rods (11) are commonly 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 and away from the accumulated ash in stages after the ash is accumulated, and the partition frame (3) is provided with a limit 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 is characterized in that: The power assembly comprises symmetrically distributed L-shaped rods (12), the middle part of the L-shaped rods (12) is hinged to the return shell (1), the L-shaped rods (12) are used to push the lifting frame (10) to move upward, and an adjustment block (13) is hinged at one end of the L-shaped rod (12) close to the partition frame (3), and the adjustment 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 is 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 is characterized in that: The protective shell (14) is trumpet-shaped, and the diameter of the protective shell (14) increases as the distance between the protective shell (14) and 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. The return ash discharge device for a fluidized bed boiler according to claim 2, characterized in that: The limiting assembly comprises a limiting rod (21), the limiting rod (21) is slidably connected to the partition frame (3), a second spring (22) is fixedly connected between the limiting rod (21) and the partition frame (3), and an axially distributed limiting groove (23) is provided on the return shell (1), and the limiting groove (23) is used to limit the limiting rod (21).

6. The return ash discharge device for a fluidized bed boiler according to claim 5, characterized in that: 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 as the distance between the limiting groove and the partition frame (3) increases, and the depth of the limiting groove (23) is less than the radius of the hemispherical head on the limiting rod (21).

7. The return ash discharge device for a fluidized bed boiler according to claim 5, characterized in that: The invention also comprises a blowing assembly, which is arranged on the return shell (1) and is used for blowing air from the bottom to the ash accumulated on the partition frame (3) to reduce the amount of ash accumulated on the upper side of the partition frame (3). The blowing assembly comprises a plurality of air inlet pipes (401), which are arranged in the return shell (1). All the air inlet pipes (401) and all the air storage pipes (4) are arranged at intervals. The air inlet pipes (401) are fixedly connected to and communicated with a second branch pipe (15). The second branch pipe (15) is slidably connected to and communicated with a sealing pipe (16) slidably connected to the partition frame (3). A sealing pipe (16) is provided between the second branch pipe (15) and the sealing pipe (16). The sealing tube (16) is provided with a damping device, the sealing tube (16) is slidably connected to a fixed shell (17) rotatably connected to the partition frame (3), and a tension spring (18) is fixedly connected therebetween. 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), and the circular plate is used to block the top second exhaust holes on the fixed shell (17). The sealing tube (16) is provided with a connecting hole connected to the fixed shell (17). The sealing tube (16) is provided with a rotating assembly, and the rotating assembly is used to drive the fixed shell (17) to rotate and increase the range of blowing the ash when the fixed shell (17) blows the ash accumulated on the partition frame (3).

8. The return ash discharge device for a fluidized bed boiler according to claim 7, characterized in that: The rotating assembly includes a rotating tube (19), the rotating tube (19) 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 thread 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) is located in the thread groove (20) and slides.

9. The return ash discharge device for a fluidized bed boiler according to claim 7, characterized in that: The invention also comprises a material shifting assembly, which is arranged on the partition frame (3) and is used for driving the ash deposited on the partition frame (3) to move so as to loosen the accumulated ash. The material shifting assembly comprises a plurality of rotating rods (24), which are all rotatably connected to the partition frame (3). A plurality of axially distributed waving claws (25) are fixedly connected to the rotating rods (24). The rotating rods (24) are fixedly connected to waving frames (26). The waving frames (26) are slidably connected to the partition frame (3). A plurality of pairs of corrugated blocks (27) having the same number as the rotating rods (24) are fixedly connected to the return shell (1). The corrugated blocks (27) are used for squeezing adjacent waving frames (26) so that the waving frames (26) drive the rotating rods (24) to swing back and forth, thereby adjusting the position of the gaps between the ash on the partition frame (3).

10. The 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 the corrugated block (27) and the partition frame (3) increases, so as to gradually increase the swing amplitude of the wave frame (26).

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