Bottom-up pulse injection wall cleaning device

Abstract

The invention provides a bottom-to-top pulse injection wall cleaning device, and relates to the field of raw coal bunker cleaning of circulating fluidized bed boilers. The bottom-to-top pulse injection wall cleaning device comprises two sliding plates, the two sliding plates are connected through a connecting piece and form an inverted V shape, the sliding plates slide from top to bottom along the inclined wall of a square-cone-shaped raw coal bunker, a gas conveying pipeline fixed relative to the sliding plates is arranged on the sliding plates, and the gas conveying pipeline is communicated with a plurality of gas spraying heads spraying gas towards the tip ends of the sliding plates. According to the bottom-to-top pulse injection wall cleaning device, the inverted-V-shaped sliding plate is matched with the fixing shaft and the elastic piece, the included angle can be automatically adjusted along with the wide-end-up structure of the square-cone-shaped bin body, the whole device adopts a gliding state to be linked with airflow adjustment, and through the piston and spring structure, according to the working conditions of slight float coal, moderate accumulated coal and stubborn adherends, the bottom-to-top pulse injection wall cleaning device is achieved. Dynamic adaptation of low-flow-speed energy saving and high-flow-speed efficient stripping is achieved, and the problems that energy is wasted and blockage is not cleaned thoroughly in the traditional fixed flow speed are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of circulating fluidized bed boiler raw coal bunker cleaning, in particular to a self-down-to-up pulse jet cleaning wall device. BACKGROUND

[0002] In the field of circulating fluidized bed boiler raw coal bunker cleaning, the core branch of CFB boiler auxiliary system operation and maintenance, focusing on solving the problem of poor coal flow caused by coal accumulation, arching and wall sticking during coal storage and feeding in the raw coal bunker, which is directly related to the stability of boiler combustion condition and the safe operation of the unit. The existing cleaning technology needs to adapt to the structure of the square cone body of the raw coal bunker, as well as the working condition characteristics of the small cone angle of 60 to 65 degrees and the easy wear of the inner wall lining plate. The core goal is to reduce the frequency of coal blockage. The existing technology mainly includes manual cleaning, mechanical ramming and fixed air jet.

[0003] Because the circulating fluidized bed boiler raw coal bunker is of square cone structure, the surface of the inner wall lining plate is gradually worn and uneven after long-term coal powder scouring, and the coal powder will stick to the wall and stay, which needs to be cleaned. However, due to the constant value of the air flow velocity in the traditional jetting method, it is difficult to adjust in real time according to the degree of coal accumulation and wall sticking. In the face of slight floating coal, fixed strong air flow will cause energy waste. When encountering stubborn adherents at the protruding part of the lining plate, fixed weak air flow is also difficult to strip them. SUMMARY

[0004] In view of the shortcomings of the prior art, the present application provides a self-down-to-up pulse jet cleaning wall device, which solves the problem that the air flow velocity of jetting is difficult to adjust in real time according to the degree of coal accumulation and wall sticking.

[0005] To achieve the above purpose, the following technical scheme is adopted: a self-down-to-up pulse jet cleaning wall device, comprising two sliding plates, the two sliding plates are connected by a connecting piece and form an inverted "V" shape, and the sliding plates slide from top to bottom along the inclined wall of the square cone raw coal bunker.

[0006] A gas conveying pipe is fixed on the sliding plate, a plurality of jet heads for jetting gas towards the tip of the sliding plate are communicated on the gas conveying pipe, the gas inlet pipe of the gas conveying pipe has an inverted "G" shape, and a piston is slidably installed in the internal cavity of the gas inlet pipe.

[0007] A fixed seat is fixedly installed on the connecting piece, a sliding piece is slidably installed in the cavity of the fixed seat and fixed relative to the piston, a spring is fixedly connected between the sliding piece and the inner wall of the fixed seat, a steel wire rope is fixedly installed on the sliding piece, and one end of the steel wire rope away from the sliding piece is connected with a winch outside.

[0008] Preferably, a rotating shaft is rotatably installed at the end of each of the two sliding plates away from each other, and a roller is rotatably installed at one end of each rotating shaft.

[0009] Preferably, the inner rotation of the connecting piece is connected with two symmetrical fixed shafts, and the two fixed shafts are respectively fixedly connected with the two sliding plates.

[0010] Preferably, elastic sheets are mounted between the two sliding plates and the connecting piece.

[0011] Preferably, one end of the piston is fixedly connected with a limiting piece, and one end of the limiting piece is slidably connected with the air inlet pipe.

[0012] Preferably, the air inlet pipe and the fixed seat are internally provided with sliding grooves, and a connecting plate is fixedly connected between the limiting piece and the sliding piece.

[0013] Preferably, a counterweight is fixedly mounted on the connecting piece, and the counterweight is located between the two sliding plates.

[0014] Preferably, the air conveying pipeline further comprises a flexible pipe and two fixed pipes, two ends of the flexible pipe are respectively communicated with the two fixed pipes, the air inlet pipe is communicated with the flexible pipe, and the two fixed pipes are sealingly provided at ends away from each other.

[0015] Preferably, one side of the sliding plate is provided with a fixed plate fixed relative to the sliding plate, the air jet head is fixed on the fixed plate, the fixed plate is fixedly connected with a fixed ring, and each fixed ring is fixedly connected with the fixed pipe close to the fixed ring.

[0016] Preferably, the air inlet pipe and the fixed seat are fixed through a fixed block.

[0017] Compared with the prior art, the present application has the following beneficial effects: through the cooperation of the inverted V-shaped sliding plate, the fixed shaft and the elastic sheet, the included angle can be automatically adjusted according to the structure of the square tapered bin body which is wide at the top and narrow at the bottom, the roller reduces the sliding resistance, the whole body is closely attached to the inner wall of the inclined square tapered coal bin throughout the whole process, the whole body is linked in a sliding state to adjust the airflow, through the piston and spring structure, the low flow rate energy saving and high flow rate efficient stripping dynamic adaptation are realized according to the working conditions of slight floating coal, moderate accumulated coal and stubborn adhering objects, and the problems of energy waste and incomplete cleaning of the traditional fixed flow rate are solved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present application; Figure 2 It is a schematic diagram of the air conveying pipeline of the present application; Figure 3 It is a sectional view of the air inlet pipe and the fixed seat of the present application; Figure 4 It is a sectional view of the air inlet pipe of the present application; Figure 5 It is a sectional view of the fixed seat of the present application; Figure 6 It is a front view of the sliding plate and the connecting piece of the present application; Figure 7 This is a rear view of the skateboard and connector of the present invention; Figure 8 This is a cross-sectional view of the side view of the skateboard of the present invention.

[0019] Among them, 1. Slide plate; 2. Air supply pipe; 201. Air inlet pipe; 202. Air outlet; 203. Flexible pipe; 204. Fixed pipe; 3. Jet head; 4. Piston; 5. Hose; 6. Connector; 7. Fixed seat; 8. Sliding part; 9. Spring; 10. Steel wire rope; 11. Roller; 12. Fixed plate; 13. Elastic sheet; 14. Limiting part; 15. Slide groove; 16. Connecting plate; 17. Counterweight. Detailed Implementation

[0020] like Figures 1-8 As shown, a bottom-up pulse jet cleaning device includes two sliding plates 1. The two sliding plates 1 are connected by a connector 6 and form an inverted "V" shape. When the sliding plates 1 slide down the inclined wall of the square cone-shaped raw coal bunker, the included angle between the two sliding plates 1 gradually decreases.

[0021] The sliding plate 1 is provided with a gas conveying pipe 2 fixed relative thereto, a plurality of jet heads 3 for jetting gas towards the tip of the sliding plate 1 are communicated with the gas conveying pipe 2, the jet heads 3 should form a fan-shaped jetting range, the gas inlet pipe 201 of the gas conveying pipe 2 has an inverted "G" type structure, a piston 4 moving along the internal cavity thereof is slidingly installed in the gas inlet pipe 201, the piston 4 is used for adjusting the gas inlet amount of the gas inlet 202 of the gas inlet pipe 201 when moving, the gas inlet end of the gas inlet pipe 201 needs to be communicated with a hose 5, and gas is conveyed from the hose 5 to the gas inlet pipe 201 through an external air compressor; the inverted "G" type gas inlet pipe 201 cooperates with the piston 4 to adjust the gas inlet amount through the sliding state (such as normal, slow or stop) linkage of the sliding plate 1, realizes dynamic adaptation of the flow rate, saves energy at low flow rate when there is slight floating coal, and realizes strong stripping at maximum flow rate when there are stubborn adhering objects, solves the problems of energy waste and incomplete cleaning of the traditional fixed flow rate blowing, one end of each of the two sliding plates 1 away from each other is rotatably installed with a rotating shaft, one end of each of the rotating shafts is rotatably installed with a roller 11, the two rollers 11 are respectively pressed at two inner walls connected with the inner wall of the square tapered raw coal bunker to be cleaned, the roller 11 is rollingly matched with the adjacent bunker wall, the sliding friction between the sliding plate 1 and the bunker wall is converted into rolling friction, the sliding resistance is greatly reduced, the sliding plate 1 is prevented from being worn due to long-term friction, the inner wall of the square tapered raw coal bunker is utilized to prevent the sliding plate 1 from deviating when sliding downward, ensure that the sliding plate 1 always adheres to the cleaning surface, and improve the stability of the cleaning process, the gas conveying pipe 2 further comprises a flexible pipe 203 and two fixed pipes 204, the two ends of the flexible pipe 203 are respectively communicated with the two fixed pipes 204, the gas inlet pipe 201 is communicated with the flexible pipe 203, and the two fixed pipes 204 are sealed at one end away from each other, one side of the sliding plate 1 is provided with a fixed plate 12 fixed relative thereto, the jet head 3 is fixed on the fixed plate 12, the fixed plate 12 is fixedly connected with a fixed ring, each fixed ring is fixedly connected with the fixed pipe 204 adjacent thereto, and the gas inlet pipe 201 and the fixed seat 7 are fixed through the fixed block.

[0022] The connecting piece 6 is fixedly provided with a fixed seat 7, a sliding piece 8 that is fixed relative to the piston 4 is slidingly arranged in the cavity of the fixed seat 7, a spring 9 is fixedly connected between the sliding piece 8 and the inner wall of the fixed seat 7, a steel wire rope 10 is fixedly arranged on the sliding piece 8, the steel wire rope 10 is slidingly connected with the fixed seat 7, and one end of the steel wire rope 10, which is away from the sliding piece 8, is used for being connected with a hoist in the outside world. Two symmetrical fixed shafts are rotationally arranged in the connecting piece 6, the two fixed shafts are fixedly connected with the two sliding plates 1 respectively, so that the two sliding plates 1 can freely move. Since the inner wall of the square tapered raw coal bin has a structure of being wide at the top and narrow at the bottom, when the sliding plates 1 descend, the included angle of the two sliding plates 1 can be self-adaptively adjusted, so that the two sliding plates 1 can be attached to the inner wall of the raw coal bin. The fixed shafts enable the sliding plates 1 to freely rotate, so that the sliding plates 1 can self-adaptively adjust the included angle according to the structure of the square tapered bin body being wide at the top and narrow at the bottom, without manual intervention, so as to ensure that the sliding plates 1 are attached to the bin wall during the whole process. Elastic sheets 13 are arranged between the two sliding plates 1 and the connecting piece 6, so that the two sliding plates 1 form a stable initial included angle, which facilitates the device to be put into the bin body and quickly attached to the bin wall. One end of the piston 4 is fixedly connected with a limiting piece 14, one end of the limiting piece 14 is slidingly connected with an air inlet pipe 201, when the limiting piece 14 moves to the maximum stroke position, the limiting piece 14 abuts against the inner wall of the air inlet pipe 201, at this time, the limiting piece 14 stops moving, and the air inlet amount of an air inlet port 202 of the air inlet pipe 201 reaches the maximum. Sliding grooves 15 are arranged in the connecting piece 6 and the fixed seat 7 respectively, a connecting plate 16 is fixedly connected between the limiting piece 14 and the sliding piece 8. A counterweight 17 is fixedly arranged on the connecting piece 6, and the counterweight 17 is located between the two sliding plates 1. The counterweight 17 increases the overall gravity of the sliding plates 1, improves the downward sliding force, and can overcome a small amount of accumulated coal resistance.

[0023] The device is based on the structural characteristics of the square tapered raw coal bin being wide at the top and narrow at the bottom and the uneven working condition after the lining plate is worn, and realizes efficient wall cleaning through attachment and self-adaptive airflow speed adjustment. In use, the elastic sheets 13 provide the two sliding plates 1 with a stable inverted “V” type initial included angle. This structure can match the wide opening size of the upper part of the raw coal bin, so that the staff can easily put the device into the bin opening and quickly attach it to the inner wall to be cleaned. At the same time, the counterweight 17 is fixed between the two sliding plates 1, which not only increases the overall gravity of the device to reserve the initial downward sliding force, but also assists the sliding plates 1 to attach to the bin wall in the initial stage, avoiding the attachment from being not firm due to insufficient weight. After being put into the bin body, the two rollers 11 are respectively pressed on the adjacent bin walls of the inner wall to be cleaned, and the lateral support force of the inclined inner wall of the square tapered bin body is used to limit the lateral deviation of the sliding plates 1. The roller 11 converts the sliding friction between the sliding plates 1 and the bin wall into rolling friction, greatly reduces the subsequent downward sliding resistance, and avoids the wear of the sliding plates 1 caused by long-term friction. Even if the surface of the lining plate is uneven, the roller 11 can still stably move the sliding plates 1, ensuring the stability of the cleaning process.

[0024] It should be noted that the winch connected to the wire rope 10 and the air compressor connected to the hose 5 should be installed on the outside of the raw coal bunker. The wire rope 10 wound on it is slowly released by the winch. When the device slides down the inclined surface of the inner wall of the square pyramidal bunker using the gravity of the wire rope 10 and the counterweight 17, the lateral pressure on the two sliding plates 1 gradually increases due to the bunker's structure of being wider at the top and narrower at the bottom. At this time, the two symmetrical fixed axes inside the connector 6 allow the sliding plates 1 to rotate freely, so that the included angle of the two sliding plates 1 adaptively decreases with the change of the bunker's cross-sectional dimensions. This ensures that the two sliding plates 1 fit tightly against the bunker wall throughout the process without manual intervention. Even if the liner is locally worn, deformed, or uneven, the sliding plates 1 can still maintain a close fit with the bunker wall through slight angle adjustments. During the descent of the sliding plates 1 against the bunker wall, the tip of the sliding plates 1 scrapes the inner wall of the bunker wall, and the jet nozzle 3 cleans the dust. During the adjustment of the included angle of the sliding plates 1, the flexible pipe 203 in the gas pipeline 2 will change with the included angle. Synchronous deformation prevents the pipe from bending or breaking due to the rotation of the slide plate 1, ensuring continuous and uninterrupted air supply. The fixed pipe 204 provides a stable installation base for the jet head 3, preventing the jet head 3 from deviating in jet direction due to pipe deformation. At the same time, the fixed plate 12 is fixedly connected to the fixed pipe 204 through the fixed ring, which not only strengthens the connection strength between the pipe and the slide plate 1 and resists jet vibration and coal flow impact, but also provides a precise installation benchmark for the jet head 3, ensuring that the fan-shaped jet range of each jet head 3 can cover the corresponding bin wall area, so that the coal powder adhering to the wall can be separated. The external air compressor delivers compressed air to the inverted "G"-shaped air inlet pipe 201 through the hose 5. The fixed block firmly connects the air inlet pipe 201 to the fixed seat 7, preventing the air inlet pipe 201 from loosening or shifting due to airflow impact and vibration caused by the movement of the slide plate 1, ensuring stable airflow delivery. The compressed air enters the flexible pipe 203 through the air inlet pipe 201, and then splits to the two fixed pipes 204, and finally is ejected through the jet head 3, forming a fan-shaped impact airflow.

[0025] When the entire device slides down normally (with slight coal floating): When only slight coal is attached to the bin wall, the sliding plate 1 experiences little resistance and slides down at a constant speed under the gravity of the counterweight 17. At this time, under the gravity of the entire device and the counterweight 17, the wire rope 10 will be taut, and the sliding member 8 will be in its initial position under the preload of the spring 9, that is, the sliding member 8 will be against the inner top wall of the cavity of the fixed seat 7. Then, it will drive the piston 4 to the initial stroke position of the air inlet 201, and the opening area of ​​the air outlet 202 of the air inlet 201 will be... The smaller size and lower airflow velocity meet the stripping requirements for slightly loose coal while avoiding the energy waste caused by traditional fixed strong airflow. When the overall descent of the device is slow (moderate coal accumulation condition): when the coal accumulation on the bin wall increases or coal stagnation forms at the uneven parts of the liner, the sliding plate 1 experiences increased resistance and slower descent speed. At this time, the descent force of the sliding plate 1 is transmitted to the fixed seat 7 through the connecting piece 6, and then acts on the sliding piece 8. The compression spring 9 causes the sliding piece 8 to move along the cavity of the fixed seat 7. The connecting plate 16 (connecting the limiting piece 14 and the sliding piece) 8) The sliding element 8 drives the piston 4 to move along the cavity of the inverted "G"-shaped air inlet pipe 201, increasing the opening area of ​​the air outlet 202. The airflow velocity increases accordingly, forming a stronger impact airflow, which efficiently strips away moderately deposited coal and solves the problem of incomplete clearing by traditional fixed weak airflow. When the entire device stops sliding down (stubborn adhesion condition): when the sliding plate 1 encounters stubborn adhesion or hardened coal at the protrusion of the liner, the sliding down completely stops. At this time, the sliding resistance reaches its maximum, the spring 9 is compressed to its limit, and the sliding element 8 drives the piston 4 to move along the cavity of the inverted "G"-shaped air inlet pipe 201. When piston 4 moves to its maximum stroke, limiting member 14 moves synchronously with piston 4, eventually abutting against the inner wall of intake pipe 201, restricting piston 4 from moving further. At this time, the opening area of ​​air outlet 202 of intake pipe 201 is at its maximum, and the airflow velocity reaches its peak, forming a concentrated and powerful impact airflow. Combined with the mechanical adhesion pressure of slide plate 1, it completely peels off stubborn deposits. At the same time, the limiting function of limiting member 14 ensures the stability of air intake, avoids airflow fluctuations caused by excessive movement of piston 4, and improves the success rate of clearing stubborn coal deposits.

[0026] Once the device has slid down to the bottom of the raw coal bunker and completed the unblocking of the entire bunker, the wire rope 10 (slidably connected to the fixed base 7) is pulled upwards by an external winch to retract the device. During the retraction process, the cross-sectional dimensions of the bunker gradually increase, and the elastic plate 13 releases elastic potential energy, pushing the included angle of the two sliding plates 1 to gradually return to the initial state, making it easy to remove the device from the bunker opening. At the same time, the spring 9 drives the sliding part 8 and the piston 4 to return to the original position, and the airflow velocity returns to the initial low velocity state, reducing energy consumption during the retraction process. After retraction, the device can be directly used for the next unblocking operation without additional adjustments, improving operational efficiency.

[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bottom-up pulse jet cleaning device for wall cleaning, characterized in that: It includes two sliding plates (1), which are connected by a connector (6) to form an inverted "V" shape. The sliding plates (1) slide from top to bottom along the inclined wall of the square pyramidal raw coal bunker. The slide (1) is provided with a fixed air supply pipe (2), and the air supply pipe (2) is connected to several jet heads (3) that spray air towards the tip of the slide (1). The air inlet pipe (201) of the air supply pipe (2) has an inverted "G" shaped structure, and a piston (4) that moves along its internal cavity is slidably installed in the air inlet pipe (201). A fixed seat (7) is fixedly installed on the connector (6). A sliding member (8) fixed relative to the piston (4) is slidably installed in the cavity of the fixed seat (7). A spring (9) is fixedly connected between the sliding member (8) and the inner wall of the fixed seat (7). A wire rope (10) is fixedly installed on the sliding member (8). The end of the wire rope (10) away from the sliding member (8) is used to connect to an external winch.

2. The bottom-up pulse jet cleaning device according to claim 1, characterized in that: The two slides (1) are each mounted with a rotating shaft at one end that is far apart from each other, and a roller (11) is mounted at one end of each rotating shaft.

3. The bottom-up pulse jet cleaning device according to claim 1, characterized in that: The internal rotational connection of the connector (6) has two symmetrical fixed shafts, which are respectively fixedly connected to two slide plates (1).

4. The bottom-up pulse jet cleaning device according to claim 1, characterized in that: An elastic sheet (13) is installed between each of the two slide plates (1) and the connector (6).

5. The bottom-up pulse jet cleaning device according to claim 1, characterized in that: One end of the piston (4) is fixedly connected to a limiting member (14), and one end of the limiting member (14) is slidably connected to the air intake pipe (201).

6. The bottom-up pulse jet cleaning device according to claim 5, characterized in that: The air intake pipe (201) and the fixed base (7) are both provided with sliding grooves (15), and a connecting plate (16) is fixedly connected between the limiting member (14) and the sliding member (8).

7. The bottom-up pulse jet cleaning device according to claim 1, characterized in that: A counterweight (17) is fixedly installed on the connector (6), and the counterweight (17) is located between the two slide plates (1).

8. The bottom-up pulse jet cleaning device according to claim 1, characterized in that: The gas pipeline (2) also includes a flexible pipe (203) and two fixed pipes (204). The two ends of the flexible pipe (203) are connected to the two fixed pipes (204) respectively. The air inlet pipe (201) is connected to the flexible pipe (203). The ends of the two fixed pipes (204) that are far apart from each other are sealed.

9. The bottom-up pulse jet cleaning device according to claim 8, characterized in that: The skateboard (1) has a fixed plate (12) fixed to one side, the jet head (3) is fixed on the fixed plate (12), and a fixed ring is fixedly connected to the fixed plate (12). Each fixed ring is fixedly connected to the fixed tube (204) adjacent to it.

10. The bottom-up pulse jet cleaning device according to claim 1, characterized in that: The air intake pipe (201) is fixed to the mounting base (7) by a fixing block.

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