Boiler ash removal structure

Abstract

The utility model discloses a boiler ash removal structure, including boiler group, storage jar, conveying device, recovery unit and controlling means. Among them, the storage jar includes the jar body for storing the ball, and the jar body includes the bead inlet and the bead outlet, the conveying device includes the first feeding machine, the conveying line and the flow valve, and the inlet of first feeding machine is connected with the bead outlet, and the outlet of first feeding machine is connected with the conveying line, and the conveying line is connected with the top of boiler group, and the flow valve is installed in the joint of conveying line and boiler group, the recovery unit includes the backflow line and the second feeding machine, and the backflow line is connected with the bottom of boiler group, and the inlet of second feeding machine is connected with the backflow line, and the outlet of second feeding machine is connected with the bead inlet, the controlling means includes the timer and the controller, and conveying device, recovery unit and timer all are connected with the controller communication. The boiler ash removal structure in scheme can realize the effect of timing automatic cleaning boiler group, has the advantages such as less manual intervention, high ash removal efficiency.

Description

Technical Field

[0001] This utility model relates to the field of boiler cleaning technology, and in particular to a boiler ash removal structure. Background Technology

[0002] In industrial production, waste heat boilers are used to recover heat energy from high-temperature flue gas. High-temperature flue gas typically contains various types of dust, which easily adhere to the walls of heat exchange tubes. With the use of the waste heat boiler, dust continuously accumulates on the tube walls, forming ash deposits. These ash deposits not only significantly reduce heat exchange efficiency, leading to energy waste, but also increase the boiler's operating resistance and may even pose safety hazards. Traditional ash removal methods rely heavily on manual operation, requiring boiler shutdown, resulting in low efficiency, high manpower and material costs, and severely impacting production progress. Utility Model Content

[0003] The main purpose of this utility model is to propose a boiler ash removal structure, which aims to solve the technical problem of low efficiency in the ash removal process of waste heat boilers.

[0004] To achieve the above objectives, this utility model proposes a boiler ash removal structure, comprising:

[0005] Boiler unit;

[0006] A storage tank, the storage tank including a tank body for storing balls, the tank body including a ball inlet and a ball outlet;

[0007] A conveying device, comprising a first conveyor, a conveyor line, and a flow valve, wherein the inlet of the first conveyor is connected to the outlet of the ball, the outlet of the first conveyor is connected to the conveyor line, the conveyor line is connected to the top of the boiler group, and the flow valve is installed at the connection between the conveyor line and the boiler group.

[0008] The recycling device includes a return line and a second conveyor. The return line is connected to the bottom of the boiler group, the inlet of the second conveyor is connected to the return line, and the outlet of the second conveyor is connected to the bead inlet.

[0009] The control device includes a timer and a controller, and the conveying device, the recycling device, and the timer are all communicatively connected to the controller.

[0010] In one embodiment, the conveyor line includes a conveyor chain and a feed pipe, the feed pipe being connected to the boiler unit, the flow valve being installed on the feed pipe, and the two ends of the conveyor chain being connected to the feed pipe and the discharge port of the first conveyor, respectively.

[0011] In one embodiment, the return line includes a collecting pipe and a return chain. The collecting pipe is connected to the bottom of the boiler group, and the two ends of the return chain are respectively connected to the collecting pipe and the inlet of the second conveyor.

[0012] In one embodiment, the boiler group includes a flue gas inlet and a flue gas outlet. A plurality of recovery tanks are arranged between the flue gas inlet and the flue gas outlet and are connected in sequence. There are multiple feed pipes and multiple discharge pipes, which are arranged one-to-one with the recovery tanks. The feed pipe is connected to the top of the recovery tank, and the collection pipe is connected to the bottom of the recovery tank. Each feed pipe is equipped with a flow valve.

[0013] In one embodiment, the boiler ash removal structure further includes a screening device installed on the return line. The screening device includes a screen with a mesh size smaller than the diameter of the ball bearings. The screening device is communicatively connected to the controller.

[0014] In one embodiment, the ball bearing is made of stainless steel or copper alloy. The boiler ash removal structure also includes a magnetic separator, which is installed on the return line and between the screening device and the second conveyor. The magnetic separator is communicatively connected to the controller.

[0015] In one embodiment, the storage tank further includes a level gauge installed in the tank body.

[0016] In one embodiment, the storage tank further includes an observation window installed on the tank body.

[0017] In one embodiment, the top of the tank has a feeding port, the bottom of the tank has a discharging port, the feeding port is covered with a dust cover, and the discharging port is covered with a sealing cap.

[0018] In one embodiment, the feed inlet of the second feeder is a conical inlet, and the return line is located above the conical inlet near the end of the second feeder.

[0019] According to the technical solution of this utility model, the boiler ash removal structure includes a boiler group, a storage tank, a conveying device, a recovery device, and a control device. The storage tank includes a tank body for storing ball bearings, and includes a ball bearing inlet and a ball bearing outlet. The conveying device includes a first conveyor, a conveyor line, and a flow valve. The inlet of the first conveyor is connected to the ball bearing outlet, and the outlet of the first conveyor is connected to the conveyor line. The conveyor line is connected to the top of the boiler group, and the flow valve is installed at the connection between the conveyor line and the boiler group. The recovery device includes a return line and a second conveyor. The return line is connected to the bottom of the boiler group, the inlet of the second conveyor is connected to the return line, and the outlet of the second conveyor is connected to the ball bearing inlet. The control device includes a timer and a controller. The conveying device, the recovery device, and the timer are all communicatively connected to the controller. With this setup, the timer sends a start signal to the controller after a predetermined time. The controller automatically activates the conveying and recycling devices, causing the balls in the tank to be transported to the conveyor line by the first conveyor and enter the boiler unit through a flow valve. As the balls fall through the boiler unit, they impact the heat exchange tubes, causing the accumulated ash on the tubes to fall off, thus achieving the purpose of ash removal. The balls that fall to the bottom of the boiler unit enter the return line and are then carried by the return line to the second conveyor, which re-feeds the balls back into the tank, completing the ball return process. In this way, manual ash removal is unnecessary; the controller can automatically complete the ash removal operation according to the ash removal cycle set by the timer, reducing manual intervention and improving the efficiency of the ash removal process. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 A schematic diagram of an embodiment of the boiler ash removal structure provided by this utility model;

[0022] Figure 2 A schematic diagram of another embodiment of the boiler ash removal structure provided by this utility model;

[0023] Figure 3 for Figure 2 A partial structural diagram.

[0024] Explanation of icon numbers:

[0025] 100. Boiler ash removal structure;

[0026] 1. Boiler unit; 11. Flue gas inlet; 12. Flue gas outlet; 13. Recovery tank;

[0027] 2. Storage tank; 21. Tank body; 22. Level gauge; 23. Observation window;

[0028] 3. Conveying device; 31. First conveyor; 32. Conveyor line; 321. Conveyor chain; 322. Feed pipe; 33. Flow valve;

[0029] 4. Recycling device; 41. Return line; 411. Collection pipe; 412. Return chain; 42. Second conveyor;

[0030] 5. Control device; 51. Timer; 52. Controller;

[0031] 6. Screening device;

[0032] 7. Magnetic separator;

[0033] X. Work direction.

[0034] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0037] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0038] In industrial production systems, waste heat boilers are crucial energy-saving devices. Their core function is to recover heat energy from high-temperature flue gas, enabling secondary energy utilization. However, high-temperature flue gas often contains various industrial dusts. As these dusts flow through the waste heat boiler, they gradually adhere to the heat exchange tube walls and the boiler's inner wall due to temperature changes and airflow disturbances. With continuous boiler operation, dust accumulates, forming a thick ash layer on the heat exchange tube walls. The presence of ash hinders normal heat transfer, significantly reducing heat exchange efficiency and causing heat loss. Simultaneously, ash alters the airflow distribution inside the boiler, increasing operating resistance, and long-term accumulation may even lead to localized overheating safety hazards.

[0039] Currently, industrial ash removal methods still primarily rely on traditional approaches, which are highly dependent on manual operation. However, the applicant's observations and research have revealed that due to the unique structure of waste heat boilers, ash removal operations must be performed after the boiler is shut down, directly leading to production line interruptions. During manual ash removal, operators must clean each heat exchanger tube individually, which is not only labor-intensive but also significantly affected by human factors in terms of cleaning effectiveness. Furthermore, ash removal operations require specialized tools and protective equipment, further increasing the investment of manpower and resources. Frequent shutdowns for ash removal also disrupt production plans, affect product delivery cycles, and cause additional economic losses to enterprises.

[0040] In view of this, the present invention proposes a boiler ash removal structure to solve or at least alleviate the above problems.

[0041] Please see Figure 1In one embodiment of this utility model, the boiler ash removal structure 100 includes a boiler group 1, a storage tank 2, a conveying device 3, a recycling device 4, and a control device 5. The storage tank 2 includes a tank body 21 for storing balls, and the tank body 21 includes a ball inlet and a ball outlet; the conveying device 3 includes a first conveyor 31, a conveyor line 32, and a flow valve 33. The inlet of the first conveyor 31 is connected to the ball outlet, and the outlet of the first conveyor 31 is connected to the conveyor line 32. The conveyor line 32 is connected to the top of the boiler group 1, and the flow valve 33 is installed at the connection between the conveyor line 32 and the boiler group 1; the recycling device 4 includes a return line 41 and a second conveyor 42. The return line 41 is connected to the bottom of the boiler group 1, the inlet of the second conveyor 42 is connected to the return line 41, and the outlet of the second conveyor 42 is connected to the ball inlet; the control device 5 includes a timer 51 and a controller 52. The conveying device 3, the recycling device 4, and the timer 51 are all communicatively connected to the controller 52.

[0042] Specifically, the first conveyor 31 and the second conveyor 42 include either a trough conveyor or a screw conveyor, or even a centrifugal pump, used to transport the balls against gravity to the tank 21. The conveyor line 32 and the return line 41 include at least one type: a trough conveyor chain or a top plate conveyor chain (the top plate has holes or grooves). The number and diameter of the balls can be selected according to the size of the boiler group 1 to be cleaned. The connection between the first conveyor 31 and the conveyor line 32 includes either a hinge or welding; the discharge port of the first conveyor 31 can even be directly suspended above the conveyor line 32. The specific connection method is determined by ensuring that the discharge port of the first conveyor 31 can continuously supply balls to the conveyor line 32. Similarly, the connection method between the return line 41 and the second conveyor 42 is the same as the connection method between the first conveyor 31 and the conveyor line 32.

[0043] It should be noted that the connection between the conveyor line 32 and the boiler group 1 should enable the conveyor line 32 to directly deliver balls into the boiler group 1. In one embodiment, an opening controlled by a flow valve 33 can be made at the top of the boiler group 1. The balls in the conveyor line 32 enter the boiler group 1 through the flow valve 33 and the opening, causing the balls to accelerate and impact the heat exchange tube wall inside the boiler group 1 by gravity. The vibration is then transmitted to the inner wall of the boiler group 1 by the heat exchange tube, allowing the accumulated ash on the heat exchange tube wall and the inner wall surface of the boiler group 1 to fall off under continuous vibration. In addition, an electric valve is also provided at the bottom of the boiler group 1. When it is not necessary to clean the accumulated ash, both the flow valve 33 and the electric valve are closed. They are only opened according to the instruction of the controller 52 when it is necessary to clean the accumulated ash. The connection between the bottom of the boiler group 1 and the return line 41 can be either welded or hinged. Alternatively, the bottom outlet of the boiler group 1 can be suspended above the return line 41. The specific connection method should be based on the ability of the return line 41 to continuously receive balls from the bottom outlet of the boiler group 1.

[0044] It should also be noted that in this embodiment, the controller 52 includes either an industrial computer or a PLC, the timer 51 includes either an electronic timer 51 or a solid-state relay integrated timer 51, and the ball bearings include either steel balls or copper alloy balls. During the ash removal operation of the boiler ash removal structure 100 provided in this embodiment, the boiler group 1 can be in either an open or closed state. When the boiler group 1 is in the open state, the ball bearings can also clean the heat exchange tube walls and the inner wall of the boiler group 1. Due to the negative pressure within the boiler group 1, the detached ash will not leak to the outside through the top and bottom of the boiler group 1.

[0045] The technical solution of this embodiment utilizes the coordination between timer 51, controller 52, conveying device 3, and recycling device 4. Timer 51 sends a start signal to controller 52 after a predetermined time. Controller 52 automatically controls the conveying device 3 and recycling device 4 to start, causing the balls in tank 21 to be conveyed by first conveyor 31 to conveyor line 32 and then enter boiler group 1 through flow valve 33. As the balls fall in boiler group 1, they impact the heat exchange tubes, causing the accumulated ash on the surface of the heat exchange tubes to fall off, thus achieving the purpose of ash removal. The balls falling to the bottom of boiler group 1 enter return line 41 and then follow return line 41 into second conveyor 42, which re-feeds the balls into tank 21, completing the ball return process. Thus, manual ash removal is unnecessary; controller 52 can automatically complete the ash removal operation according to the ash removal cycle set by timer 51, reducing manual intervention and improving the efficiency of ash removal.

[0046] In one embodiment of this utility model, please refer to Figure 1 and Figure 2 The conveyor line 32 includes a conveyor chain 321 and a feed pipe 322. The feed pipe 322 is connected to the boiler group 1, and a flow valve 33 is installed on the feed pipe 322. Both ends of the conveyor chain 321 are connected to the feed pipe 322 and the discharge port of the first conveyor 31, respectively. The conveyor chain 321 can be either a trough conveyor chain or a top plate conveyor chain (the top plate has holes or grooves). The feed pipe 322 can be either a tapered pipe (with the larger opening facing the conveyor chain 321) or a round pipe. Both ends of the flow valve 33 are connected to two sections of the feed pipe 322, respectively. This arrangement forms a buffer structure between the conveyor chain 321 and the boiler group 1, reducing the occurrence of ball bearing scattering and facilitating the installation of the flow valve 33.

[0047] For further information, please refer to [link / reference]. Figure 1 and Figure 2In one embodiment of this utility model, the return line 41 includes a collecting pipe 411 and a return chain 412. The collecting pipe 411 is connected to the bottom of the boiler group 1, and the two ends of the return chain 412 are respectively connected to the inlet of the collecting pipe 411 and the second conveyor 42. The return chain 412 may be either a trough conveyor chain or a top plate conveyor chain (the top plate has holes or grooves). The collecting pipe 411 is either a tapered pipe (the side with the larger opening faces the conveyor chain 321) or a round pipe. An electric valve is installed at the connection between the collecting pipe 411 and the boiler group 1 to control the opening and closing of the bottom of the boiler group 1. This arrangement creates a buffer structure between the boiler group 1 and the return chain 412, thereby reducing the scattering of balls when they enter the return chain from the boiler group 1, and facilitating the continuous and stable entry of balls from the boiler group 1 into the return chain.

[0048] Furthermore, in one embodiment of this utility model, please refer to... Figure 2 and Figure 3 Boiler unit 1 includes a flue gas inlet 11 and a flue gas outlet 12. Multiple recovery tanks 13 are arranged sequentially and connected between the flue gas inlet 11 and the flue gas outlet 12. Multiple feed pipes 322 and multiple discharge pipes are arranged corresponding to the recovery tanks 13. The feed pipe 322 is connected to the top of the recovery tank 13, and the collection pipe 411 is connected to the bottom of the recovery tank 13. Each feed pipe 322 is equipped with a flow valve 33. Specifically, in this embodiment, along the operating direction X (i.e., Figure 3(In the direction indicated by the middle arrow X), boiler group 1 includes a flue gas inlet 11, multiple recovery tanks 13, and a flue gas outlet 12. The flue gas to be recovered enters boiler group 1 through flue gas inlet 11, passes through multiple recovery tanks 13 sequentially along the working direction X, and is discharged from flue gas outlet 12. The top and bottom of each recovery tank 13 are connected to a feed pipe 322 and a collection pipe 411, respectively, and each feed pipe 322 is equipped with a flow valve 33. During ash removal operations, a negative pressure environment exists in boiler group 1, and the flue gas flows along the working direction X, allowing the ash removed from the recovery tanks 13 to move with the flue gas to the flue gas outlet 12 and be discharged into an external flue gas treatment device, preventing the ash from escaping and polluting the atmosphere. Since the detached ash can move along the working direction X, the cleaning operation requires sequentially cleaning the recovery tanks 13 along this direction. When cleaning one recovery tank 13, the flow valve 33 corresponding to that tank 13 is opened, allowing the ball bearings to fall into it. After cleaning the recovery tank 13, the flow valve 33 is closed, and simultaneously the flow valve 33 corresponding to the next recovery tank 13 along the working direction X is opened, and so on, until all recovery tanks 13 in boiler group 1 are cleaned. This ensures that the cleaned ash does not escape into other recovery tanks 13 in the opposite direction to the working direction X, thus preventing secondary contamination of the already cleaned recovery tanks 13.

[0049] In one embodiment of this utility model, please refer to Figure 1 and Figure 2 The boiler ash removal structure 100 also includes a screening device 6, which is installed on the return line 41. The screening device 6 includes a screen with a mesh size smaller than the diameter of the balls. The screening device 6 is communicatively connected to the controller 52. The screening device 6 can be either a linear vibrating screen or a rotary vibrating screen. Dust that cannot be removed by a negative pressure environment may adhere to the surface of the balls due to electrostatic attraction. Therefore, by installing the screening device 6 on the return line 41, this dust is removed from the surface of the balls under vibration, thus preventing the balls from carrying a large amount of dust back to the tank 21.

[0050] Furthermore, in one embodiment of this utility model, the ball bearing is made of either stainless steel or copper alloy. The boiler ash removal structure 100 also includes a magnetic separator 7, which is installed on the return line 41 and between the screening device 6 and the second conveyor 42. The magnetic separator 7 is communicatively connected to the controller 52. Specifically, during the process of cleaning the ball bearing recovery tank 13, due to the rebound vibration of the ball bearing, iron filings inevitably fall off in the recovery tank 13. Since the unit mass of the iron filings is relatively large, it is difficult for them to be discharged with the flue gas along the working direction X. Therefore, the iron filings are often discharged from the recovery tank 13 with the ball bearings. In order to realize the recycling of iron filings, a magnetic separator 7 is installed in the return line 41. Specifically, a return chain 412 is provided at both the inlet and outlet of the magnetic separator 7. In this embodiment, in order to facilitate the separation of iron filings from the ball bearings, the ball bearings are made of non-magnetic or weakly magnetic materials. Specifically, in this embodiment, the ball bearings are made of either stainless steel or copper alloy (excluding iron and nickel). Thus, after the balls and iron filings enter the magnetic separator 7, the balls separate from the iron filings due to the magnetic field. The balls enter the return chain 412 through the outlet of the magnetic separator 7, while the iron filings are collected by the magnetic separator 7 for recycling. It should be noted that in this embodiment, the aperture of the screen in the screening device 6 is smaller than the outer diameter of the balls and some of the iron filings to avoid all the iron filings being screened out by the screening device 6, which would reduce the iron filings recovery rate.

[0051] In one embodiment of this utility model, please refer to Figure 1 The storage tank 2 also includes a level gauge 22, which is installed on the tank body 21. The level gauge 22 includes either a rotary paddle level gauge or a radar level gauge. This configuration allows for real-time monitoring of the ball bearing storage in the tank body 21, preventing ball bearing overflow or supply interruption, thus ensuring the continuity of the dust removal operation.

[0052] In one embodiment of this utility model, please refer to Figure 1 The storage tank 2 also includes an observation window 23, which is installed on the tank body 21. The observation window 23 consists of an outer frame and transparent glass, allowing the operator to observe the amount of balls stored in the tank body 21 in real time. This, in conjunction with the monitoring results of the level gauge 22, can further prevent the balls from overflowing or being interrupted in supply.

[0053] In one embodiment of this utility model, a feeding port is provided at the top of the tank 21, and a discharge port is provided at the bottom of the tank 21. The feeding port is covered with a dust cover, and the discharge port is covered with a sealing cap. Both the dust cover and the sealing cap are movably connected to the tank 21 (hinged or sliding connection). When ball bearings need to be replenished, the dust cover is moved to open the feeding port, allowing the ball bearings to enter the tank 21 through the feeding port. When ball bearings need to be replaced or the amount of ball bearings in the tank 21 needs to be reduced, the sealing cap is moved to open the discharge port, allowing the ball bearings to automatically flow out along the discharge port under gravity. This design enables rapid replenishment and discharge of ball bearings, improving the efficiency of replenishment and discharge. Furthermore, the dust cover helps reduce the entry of external dust into the tank 21, thus helping to maintain the cleanliness of the tank 21.

[0054] In one embodiment of this utility model, the boiler ash removal structure 100 also includes a movable shot suction machine for sucking up and recycling the ball bearings that have fallen to the ground, so as to reduce the waste of the ball bearings and reduce the risk of slipping and falling caused by people stepping on the ball bearings.

[0055] In one embodiment of this utility model, please refer to Figure 1 The feed inlet of the second feeder 42 is a conical inlet, and the return line 41 is positioned above the conical inlet near the end of the second feeder 42. The inclined inner wall of the conical inlet effectively guides and converges the falling ball flow, causing it to concentrate into the second feeder 42. Positioning the outlet of the return line 41 directly above the conical inlet fully utilizes gravity, allowing the balls to fall naturally at a relatively vertical angle. This arrangement reduces collisions between the balls and the edge of the conical inlet, helping to minimize splashing.

[0056] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A boiler ash removal structure, characterized in that, include: Boiler unit; A storage tank, the storage tank including a tank body for storing balls, the tank body including a ball inlet and a ball outlet; A conveying device, comprising a first conveyor, a conveyor line, and a flow valve, wherein the inlet of the first conveyor is connected to the outlet of the ball, the outlet of the first conveyor is connected to the conveyor line, the conveyor line is connected to the top of the boiler group, and the flow valve is installed at the connection between the conveyor line and the boiler group. The recycling device includes a return line and a second conveyor. The return line is connected to the bottom of the boiler group, the inlet of the second conveyor is connected to the return line, and the outlet of the second conveyor is connected to the bead inlet. The control device includes a timer and a controller, and the conveying device, the recycling device, and the timer are all communicatively connected to the controller.

2. The boiler ash removal structure as described in claim 1, characterized in that, The conveyor line includes a conveyor chain and a feed pipe. The feed pipe is connected to the boiler unit. The flow valve is installed on the feed pipe. The two ends of the conveyor chain are respectively connected to the feed pipe and the discharge port of the first conveyor.

3. The boiler ash removal structure as described in claim 2, characterized in that, The return line includes a collection pipe and a return chain. The collection pipe is connected to the bottom of the boiler unit, and the two ends of the return chain are respectively connected to the collection pipe and the inlet of the second conveyor.

4. The boiler ash removal structure as described in claim 3, characterized in that, The boiler unit includes a flue gas inlet and a flue gas outlet. Multiple recovery tanks are arranged between the flue gas inlet and the flue gas outlet and are connected in sequence. There are multiple feed pipes and multiple discharge pipes, which are arranged one-to-one with the recovery tanks. The feed pipe is connected to the top of the recovery tank, and the collection pipe is connected to the bottom of the recovery tank. Each feed pipe is equipped with a flow valve.

5. The boiler ash removal structure as described in claim 3, characterized in that, The boiler ash removal structure also includes a screening device, which is installed on the return line. The screening device includes a screen with a mesh size smaller than the diameter of the ball bearings. The screening device is communicatively connected to the controller.

6. The boiler ash removal structure as described in claim 5, characterized in that, The ball bearings are made of either stainless steel or copper alloy. The boiler ash removal structure also includes a magnetic separator, which is installed on the return line and between the screening device and the second conveyor. The magnetic separator is communicatively connected to the controller.

7. The boiler ash removal structure as described in any one of claims 1 to 6, characterized in that, The storage tank also includes a level gauge, which is installed on the tank body.

8. The boiler ash removal structure as described in any one of claims 1 to 6, characterized in that, The storage tank also includes an observation window, which is installed on the tank body.

9. The boiler ash removal structure as described in any one of claims 1 to 6, characterized in that, The top of the tank has a feeding port, and the bottom of the tank has a discharging port. The feeding port is covered with a dust cover, and the discharging port is covered with a sealing cap.

10. The boiler ash removal structure according to any one of claims 1 to 6, characterized in that, The feed inlet of the second feeder is a conical inlet, and the return line is located above the conical inlet near the end of the second feeder.

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