Comb tooth type shaking ash removal device for accumulated scale of air pre-heater pipe row of biomass boiler

Abstract

The utility model discloses a comb tooth type shaking ash removal device for pipe row scale deposition of an air pre-heater of a biomass boiler. The comb tooth type shaking ash removal device solves the problem that in the prior art, the effect of removing fly ash scale deposition at the end of the air pre-heater of a biomass circulating fluidized bed boiler is poor. Comprising a rectangular mounting bracket (25) of a deashing trolley driving mechanism (4) and an air pre-heater tube row (1), a rear driving chain wheel (28) is arranged at the rear end of a driving shaft (26), a rear annular chain (30) is arranged between the rear driving chain wheel (28) and a rear driven chain wheel (29), a rear L-shaped connecting plate (31) is connected to the rear annular chain in series, and the rear L-shaped connecting plate (31) is connected to the rear driving chain wheel (28). An ash removal moving rear trolley (2) and an ash removal moving front trolley (3) are arranged on the air pre-heater tube row side by side, a center supporting shaft is driven by an eccentric swing rod mechanism to periodically swing in the forward direction and the reverse direction, two shoulder-pole-shaped swing rods do seesaw movement, a comb plate is made to repeatedly saw and cut accumulated scales in the air pre-heater tube row, and the accumulated scales are effectively removed.

Description

Technical Field

[0001] The utility model relates to an air preheater of a biomass fuel circulating fluidized bed boiler, in particular to a comb-tooth shaking ash cleaning device for fouling on a pipe row of an air preheater of a biomass boiler. Background Art

[0002] In the operation of biomass circulating fluidized bed boiler, due to the high moisture content of biomass fuel and the large ash content, unburned fly ash is easily generated during combustion. These fly ashes are easy to adhere to the heating surface of the air preheater, especially in the gaps between the air preheater tubes, where scale will form. These dusts will reduce the heat transfer efficiency of the air preheater, affect the heat transfer of the primary and secondary air of the boiler, and further affect the heat transfer efficiency of the boiler; in addition, biomass fuel contains metal salts such as chlorine and alkali, which will produce substances that are corrosive to the heating surface during the combustion process. These corrosive substances will combine with fly ash and also cause corrosion to the air preheater tubes; currently, the commonly used cleaning methods are manual cleaning and steam soot blowing, but manual cleaning is labor-intensive and has low cleaning efficiency, while steam cleaning has an ineffective cleaning effect.

[0003] The utility model patent with the patent number of 2022219089407 and the name of a sawtooth comb cleaning device discloses a device for cleaning fly ash deposits in the air preheater tube row with a comb plate. The device removes fly ash deposits in the tube row by moving the comb plate connected to the circular shaft. In order to solve the problem that the fly ash deposits at the end of the comb plate stroke are repeatedly squeezed, the more they are squeezed, the shorter the stroke of the comb plate will be. The patent adopts an upwardly inclined guide plate at the end of the comb plate stroke, so that the circular shaft connected to the comb plate moves to the guide plate. When the comb plate is in the right position, it climbs upward, thereby driving the comb plate on it to be pulled upward, thereby generating an upward sawing force on the fly ash deposits at the tail end of the comb plate stroke, thereby removing the end deposits; however, for a circulating fluidized bed boiler fueled by biomass fuel, the fly ash deposits have strong adhesion due to the nature of the fuel, and the one-way one-time pulling and sawing using the above-mentioned patented technical solution has limited effect on removing the deposits; in addition, how to design a cleaning frame drive mechanism to compactly combine the cleaning frame movement with the drive device is also a problem that the drive mechanism needs to solve. Summary of the invention

[0004] The utility model provides a comb-tooth shaking ash cleaning device for scaling of air preheater tubes of a biomass boiler, which solves the problem that the prior art is not effective in removing fly ash scaling at the end of an air preheater of a circulating fluidized bed boiler using biomass fuel, and the technical problem of how to compactly combine a driving mechanism with a ash cleaning frame.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] The overall concept of the utility model is: a two-level chain drive transmission method is adopted to drive the dust cleaning frame to reciprocate left and right, a front ring chain and a rear ring chain are arranged side by side on the rectangular mounting frame of the driving mechanism, a common active driving shaft is arranged on the left side of the two ring chains, a front active driving large sprocket and a rear active driving large sprocket are respectively arranged on the active driving shaft, a rear driven sprocket and a front driven sprocket are respectively arranged on the right end of the rectangular mounting frame, a front ring drive chain is arranged between the front active driving large sprocket and the front driven sprocket, a rear ring drive chain is arranged between the rear active driving large sprocket and the rear driven sprocket, a front L-shaped connecting plate is connected in series on the front ring drive chain, and a rear ring drive chain is connected to the rear ring drive chain. An L-shaped connecting plate is connected in series on the strips, and the traction rod is connected by two L-shaped connecting plates to realize the left and right reciprocating drive of the cleaning frame; the cleaning comb frame is set on a central supporting shaft, that is, a shoulder-pole shaped swing rod is fixedly connected to the front and rear ends of the central supporting shaft, the left end of the two shoulder-pole shaped swing rods is connected to the left longitudinal beam circular tube, and the left comb tooth plate is hinged and suspended on the left longitudinal beam circular tube, the right end of the two shoulder-pole shaped swing rods is connected to the right longitudinal beam circular tube, and the right comb tooth plate is hinged and suspended on the right longitudinal beam circular tube. The central supporting shaft is driven to swing forward and reverse periodically through the eccentric swing rod mechanism, so that the two shoulder-pole shaped swing rods can make a seesaw motion, so that the comb tooth plate can repeatedly saw the scale in the air preheater tube row, so as to realize the effective cleaning of the scale.

[0007] A comb-tooth shaking ash cleaning device for fouling of an air preheater tube row of a biomass boiler comprises a rectangular mounting bracket of a ash cleaning trolley driving mechanism and an air preheater tube row, an active driving shaft is arranged at the left end of the rectangular mounting bracket, a rear active driving sprocket is arranged at the rear end of the active driving shaft, a front active driving sprocket is arranged at the front end of the active driving shaft, a rear driven driving sprocket is arranged at the rear side of the right end of the rectangular mounting bracket, a front driven driving sprocket is arranged at the front side of the right end of the rectangular mounting bracket, a rear annular chain is arranged between the rear active driving sprocket and the rear driven driving sprocket, a front annular chain is arranged between the front active driving sprocket and the front driven driving sprocket, and an active driving shaft is arranged in the middle of the active driving shaft The driving sprocket and the active driving shaft drive the annular chain connected to the main driving motor through the active driving shaft. A rear L-shaped connecting plate is connected in series on the rear annular chain. The front end of the rear L-shaped connecting plate is connected to the rear end of the moving beam. The right end of the rear L-shaped connecting plate is connected to the left end of the rear traction rod. A front L-shaped connecting plate is connected in series on the front annular chain. The rear end of the front L-shaped connecting plate is connected to the front end of the moving beam. The right end of the front L-shaped connecting plate is connected to the left end of the front traction rod. The moving beam is movably arranged on a rectangular mounting bracket, and a reciprocating swing driving motor is fixedly connected to the moving beam. A rear trolley for cleaning movement and a front trolley for cleaning movement are arranged in parallel on the air preheater tube row. The trolley, the right end of the front traction rod is connected with the front trolley for cleaning and movement, the right end of the rear traction rod is connected with the rear trolley for cleaning and movement, the front end bearing seat of the central shaft is arranged on the front trolley for cleaning and movement, the rear end bearing seat of the central shaft is arranged on the rear trolley for cleaning and movement, a central shaft is arranged between the front end bearing seat of the central shaft and the rear end bearing seat of the central shaft, a shoulder-pole-shaped front crossbeam and a shoulder-pole-shaped rear crossbeam are respectively fixedly connected on the central shaft, the shoulder-pole-shaped front crossbeam, the central shaft and the shoulder-pole-shaped rear crossbeam are in the shape of an "I", a left front boom is hinged at the left end of the shoulder-pole-shaped front crossbeam, a left rear boom is hinged at the left end of the shoulder-pole-shaped rear crossbeam, and a left toothed plate hanging longitudinal beam is connected between the lower end of the left front boom and the lower end of the left rear boom A left tooth plate is evenly suspended on the left tooth plate suspension longitudinal beam, a right front suspension arm is hinged on the right end of the shoulder-pole-shaped front cross beam, a right rear suspension arm is hinged on the right end of the shoulder-pole-shaped rear cross beam, a right tooth plate suspension longitudinal beam is connected between the lower end of the right front suspension arm and the lower end of the right rear suspension arm, and a right tooth plate is evenly suspended on the right tooth plate suspension longitudinal beam, and the left tooth plate and the right tooth plate are both arranged in the gap between the tubes of the air preheater tube row; a swing arm is fixedly connected to the middle of the central axis, a hinge connection seat is arranged at the lower end of the swing arm, a horizontal pull rod is hinged on the hinge connection seat, a connecting rod is hinged on the left end of the horizontal pull rod, and the left end of the connecting rod is connected to the connecting column on the eccentric shaft sleeve, and the eccentric shaft sleeve is connected to the output shaft of the reciprocating swing drive motor.

[0008] Saw teeth are arranged on the left end of the left tooth plate, and saw teeth are arranged on the right side of the right tooth plate.

[0009] A comb-tooth shaking ash cleaning method for fouling of an air preheater tube row of a biomass boiler is performed by a comb-tooth shaking ash cleaning device, the comb-tooth shaking ash cleaning device comprising a rectangular mounting bracket of a cleaning trolley driving mechanism and an air preheater tube row, an active driving shaft is arranged at the left end of the rectangular mounting bracket, a rear active driving sprocket is arranged at the rear end of the active driving shaft, a front active driving sprocket is arranged at the front end of the active driving shaft, a rear driven driving sprocket is arranged at the rear side of the right end of the rectangular mounting bracket, a front driven driving sprocket is arranged at the front side of the right end of the rectangular mounting bracket, a rear annular chain is arranged between the rear active driving sprocket and the rear driven driving sprocket, and a front active driving sprocket is arranged between the front active driving sprocket and the front driven driving sprocket. A front ring chain is provided, an active drive shaft driving sprocket is arranged in the middle of the active drive shaft, and the active drive shaft driving sprocket is connected to the main drive motor through the active drive shaft driving ring chain; a rear L-shaped connecting plate is connected in series on the rear ring chain, the front end of the rear L-shaped connecting plate is connected to the rear end of the moving crossbeam, the right end of the rear L-shaped connecting plate is connected to the left end of the rear traction rod, a front L-shaped connecting plate is connected in series on the front ring chain, the rear end of the front L-shaped connecting plate is connected to the front end of the moving crossbeam, the right end of the front L-shaped connecting plate is connected to the left end of the front traction rod, the moving crossbeam is movably arranged on a rectangular mounting bracket, and a reciprocating swing driving motor is fixedly connected to the moving crossbeam; in the air preheater A rear trolley for cleaning and movement and a front trolley for cleaning and movement are arranged in parallel on the pipe row, the right end of the front traction rod is connected to the front trolley for cleaning and movement, and the right end of the rear traction rod is connected to the rear trolley for cleaning and movement, a front end bearing seat of the central shaft is arranged on the front trolley for cleaning and movement, a rear end bearing seat of the central shaft is arranged on the rear trolley for cleaning and movement, a central shaft is arranged between the front end bearing seat of the central shaft and the rear end bearing seat of the central shaft, a shoulder-pole-shaped front crossbeam and a shoulder-pole-shaped rear crossbeam are fixedly connected to the central shaft respectively, a left front boom is hinged at the left end of the shoulder-pole-shaped front crossbeam, a left rear boom is hinged at the left end of the shoulder-pole-shaped rear crossbeam, a left toothed plate hanging longitudinal beam is connected between the lower end of the left front boom and the lower end of the left rear boom, and a left toothed plate hanging longitudinal beam is connected on the left side. A left tooth plate is evenly connected to the tooth plate hanging longitudinal beam, a right front suspension arm is hinged to the right end of the shoulder pole-shaped front cross beam, a right rear suspension arm is hinged to the right end of the shoulder pole-shaped rear cross beam, a right tooth plate hanging longitudinal beam is connected between the lower end of the right front suspension arm and the lower end of the right rear suspension arm, a right tooth plate is evenly connected to the right tooth plate hanging longitudinal beam, and both the left tooth plate and the right tooth plate are arranged in the gap between the tubes of the air preheater tube row; a swing rod is fixedly connected to the middle of the central axis, a hinge connection seat is arranged at the lower end of the swing rod, a horizontal pull rod is hinged on the hinge connection seat, the left end of the horizontal pull rod is hinged to a connecting rod, the left end of the connecting rod is connected to a connecting column on an eccentric shaft sleeve, and the eccentric shaft sleeve is connected to the output shaft of a reciprocating swing drive motor; it is characterized by the following steps:

[0010] When the comb-tooth cleaning frame mechanism moves to the fly ash accumulation position at the left end of the comb-tooth plate stroke, the reciprocating swing drive motor is started, and the connecting column on the eccentric shaft sleeve makes a circular motion around the central axis of the reciprocating swing drive motor, and the connecting column drives the swing arm to swing back and forth left and right through the connecting rod, the horizontal pull rod and the hinge connection seat in turn, thereby driving the central axis to reciprocate in the clockwise and counterclockwise directions in turn, and the reciprocating rotation of the central axis drives the shoulder-pole-shaped front crossbeam and the shoulder-pole-shaped rear crossbeam to synchronously make a seesaw motion, the left end of the shoulder-pole-shaped front crossbeam passes through the left front hanging arm, and the left end of the shoulder-pole-shaped rear crossbeam passes through the left rear hanging arm, synchronously driving the left tooth plate hanging longitudinal beam to make an up and down reciprocating motion, and the left tooth plate hanging longitudinal beam drives the left tooth plate to make an up and down reciprocating sawing motion in the gap between the tubes of the air preheater tube row, thereby realizing the removal of fly ash accumulation in the gap between the tubes.

[0011] When the driving mechanism of the cleaning trolley pulls the comb-tooth type cleaning frame to move horizontally, the reciprocating swing driving motor is started at the same time, thereby realizing the horizontal movement and cleaning of the comb-tooth plate while shaking up and down.

[0012] The utility model arranges sawtooth plates at both ends of a seesaw frame which can swing left and right, and utilizes an eccentric shaft sleeve on a motor drive shaft to realize the up and down shaking of the cleaning frame, thereby sawing the compacted fly ash and scale in the gap of the air preheater, and completely solves the problem of removing scale at the end of the air preheater faced by the existing sawtooth cleaning mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model in a top view;

[0014] Figure 2 yes Figure 1 AA section view in the figure;

[0015] Figure 3 yes Figure 1 BB section view in. DETAILED DESCRIPTION

[0016] The utility model is described in detail below with reference to the accompanying drawings:

[0017] A comb-tooth shaking ash cleaning device for fouling of an air preheater tube row of a biomass boiler comprises a rectangular mounting bracket 25 of a ash cleaning trolley driving mechanism 4 and an air preheater tube row, an active driving shaft 26 is arranged at the left end of the rectangular mounting bracket 25, a rear active driving sprocket 28 is arranged at the rear end of the active driving shaft 26, a front active driving sprocket 32 ​​is arranged at the front end of the active driving shaft 26, a rear driven driving sprocket 29 is arranged at the rear side of the right end of the rectangular mounting bracket 25, a front driven driving sprocket 33 is arranged at the front side of the right end of the rectangular mounting bracket 25, a rear annular chain 30 is arranged between the rear active driving sprocket 28 and the rear driven driving sprocket 29, a front annular chain 34 is arranged between the front active driving sprocket 32 ​​and the front driven driving sprocket 33, and a rear driven driving sprocket 29 is arranged at the rear side of the right end of the rectangular mounting bracket 25. An active drive shaft driving sprocket 36 is arranged in the middle of the driving shaft 26, and the active drive shaft driving sprocket 36 is connected to the main driving motor 38 through the active drive shaft driving annular chain 37; a rear L-shaped connecting plate 31 is connected in series on the rear annular chain 30, the front end of the rear L-shaped connecting plate 31 is connected to the rear end of the moving cross beam 27, and the right end of the rear L-shaped connecting plate 31 is connected to the left end of the rear traction rod 6; a front L-shaped connecting plate 35 is connected in series on the front annular chain 34, the rear end of the front L-shaped connecting plate 35 is connected to the front end of the moving cross beam 27, and the right end of the front L-shaped connecting plate 35 is connected to the left end of the front traction rod 5; the moving cross beam 27 is movably arranged on the rectangular mounting bracket 25, and a reciprocating swing driving plate 36 is fixedly connected to the moving cross beam 27. The front traction rod 5 and the rear traction rod 6 synchronously pull the two cleaning carts to move left and right for cleaning. A bearing seat 7 at the front end of the central axis is arranged on the trolley 3 before the cleaning movement, and a bearing seat 8 at the rear end of the central axis is arranged on the trolley 2 after the cleaning movement. A central axis 9 is arranged between the bearing seat 7 at the front end of the central axis and the bearing seat 8 at the rear end of the central axis. A shoulder-pole-shaped front crossbeam 10 and a shoulder-pole-shaped rear crossbeam 11 are fixedly connected to the central axis 9 respectively. The shoulder-pole-shaped front crossbeam 10, the central axis 9 and the shoulder-pole-shaped rear crossbeam 11 are in the shape of an "I" character, and two seesaws are formed in parallel front and back with the central axis 9 as a fulcrum. A left front suspension arm 12 is hinged at the left end of the shoulder-pole-shaped front crossbeam 10, and a left rear suspension arm is hinged at the left end of the shoulder-pole-shaped rear crossbeam 11. Between the lower end of the left front suspension arm 12 and the lower end of the left rear suspension arm A left toothed plate hanging longitudinal beam 14 is connected, and left toothed plates 16 are hung on the left toothed plate hanging longitudinal beam 14 at equal intervals. The left front suspension arm 12 and the left rear suspension arm convert the swinging motion of the left end of the shoulder-pole-shaped front cross beam 10 and the left end of the shoulder-pole-shaped rear cross beam 11 into an up and down reciprocating motion of the left toothed plate hanging longitudinal beam 14. A right front suspension arm 13 is hinged on the right end of the shoulder-pole-shaped front cross beam 10, and a right rear suspension arm is hinged on the right end of the shoulder-pole-shaped rear cross beam 11. A right toothed plate hanging longitudinal beam 15 is connected between the lower end of the right front suspension arm 13 and the lower end of the right rear suspension arm. Right toothed plates 17 are hung on the right toothed plate hanging longitudinal beam 15 at equal intervals. The left toothed plates 16 and the right toothed plates 17 are both arranged in the gaps between the tubes of the air preheater tube row, so that the sawtooth plate performs up and down reciprocating sawing motion in the gaps between the air preheater tube rows.A swing rod 24 is fixedly connected to the middle of the central shaft 9, a hinge connection seat 23 is arranged at the lower end of the swing rod 24, a horizontal pull rod 22 is hinged on the hinge connection seat 23, a connecting rod 21 is hinged on the left end of the horizontal pull rod 22, the left end of the connecting rod 21 is connected to the connecting column 20 on the eccentric shaft sleeve 19, the eccentric shaft sleeve 19 is connected to the output shaft of the reciprocating swing drive motor 18, and the rotation of the reciprocating swing drive motor 18 provides power for the sawtooth plate to perform up and down reciprocating sawing motion in the gap of the air preheater tube row. ;

[0018] Saw teeth are provided on the left end of the left tooth plate 16 and saw teeth are provided on the right side of the right tooth plate 17 to saw the accumulated scale into powder.

[0019] A comb-tooth shaking ash cleaning method for fouling of an air preheater tube row of a biomass boiler is performed by a comb-tooth shaking ash cleaning device, the comb-tooth shaking ash cleaning device comprising a rectangular mounting bracket 25 of a cleaning trolley driving mechanism 4 and an air preheater tube row, an active driving shaft 26 is arranged at the left end of the rectangular mounting bracket 25, a rear active driving sprocket 28 is arranged at the rear end of the active driving shaft 26, a front active driving sprocket 32 ​​is arranged at the front end of the active driving shaft 26, a rear driven driving sprocket 29 is arranged at the rear side of the right end of the rectangular mounting bracket 25, a front driven driving sprocket 33 is arranged at the front side of the right end of the rectangular mounting bracket 25, and a rear annular chain is arranged between the rear active driving sprocket 28 and the rear driven driving sprocket 29. A front ring chain 34 is provided between the front active driving sprocket 32 ​​and the front driven driving sprocket 33, and an active driving shaft driving sprocket 36 is provided in the middle of the active driving shaft 26, and the active driving shaft driving sprocket 36 is connected to the main driving motor 38 through the active driving shaft driving ring chain 37; a rear L-shaped connecting plate 31 is connected in series on the rear ring chain 30, and the front end of the rear L-shaped connecting plate 31 is connected to the rear end of the moving cross beam 27, and the right end of the rear L-shaped connecting plate 31 is connected to the left end of the rear traction rod 6, and a front L-shaped connecting plate 35 is connected in series on the front ring chain 34, and the rear end of the front L-shaped connecting plate 35 is connected to the front end of the moving cross beam 27, and the right end of the front L-shaped connecting plate 35 is connected to the left end of the rear traction rod 6. The left end of the front traction rod 5 is connected together, and the movable crossbeam 27 is movably arranged on the rectangular mounting bracket 25. A reciprocating swing driving motor 18 is fixedly connected to the movable crossbeam 27; a rear trolley 2 for cleaning movement and a front trolley 3 for cleaning movement are arranged in parallel on the air preheater tube row, the right end of the front traction rod 5 is connected to the front trolley 3 for cleaning movement, and the right end of the rear traction rod 6 is connected to the rear trolley 2 for cleaning movement, a front end bearing seat 7 of the central axis is arranged on the front trolley 3 for cleaning movement, and a rear end bearing seat 8 of the central axis is arranged on the rear trolley 2 for cleaning movement, a central axis 9 is arranged between the front end bearing seat 7 of the central axis and the rear end bearing seat 8 of the central axis, and a shoulder-pole-shaped front crossbeam 10 and a shoulder-pole-shaped front crossbeam 11 are fixedly connected to the central axis 9 respectively. A shoulder-shaped rear cross beam 11, a left front suspension arm 12 is hinged on the left end of the shoulder-shaped front cross beam 10, a left rear suspension arm is hinged on the left end of the shoulder-shaped rear cross beam 11, a left toothed plate suspension longitudinal beam 14 is connected between the lower end of the left front suspension arm 12 and the lower end of the left rear suspension arm, and left toothed plates 16 are evenly suspended on the left toothed plate suspension longitudinal beam 14, a right front suspension arm 13 is hinged on the right end of the shoulder-shaped front cross beam 10, a right rear suspension arm is hinged on the right end of the shoulder-shaped rear cross beam 11, a right toothed plate suspension longitudinal beam 15 is connected between the lower end of the right front suspension arm 13 and the lower end of the right rear suspension arm, and right toothed plates 17 are evenly suspended on the right toothed plate suspension longitudinal beam 15, and the left toothed plates 16 and the right toothed plates 17 are both arranged in the gaps between the tubes of the air preheater tube row;A swing rod 24 is fixedly connected to the middle of the central shaft 9, a hinge connection seat 23 is arranged at the lower end of the swing rod 24, a horizontal pull rod 22 is hinged on the hinge connection seat 23, the left end of the horizontal pull rod 22 is hinged to a connecting rod 21, the left end of the connecting rod 21 is connected to a connecting column 20 on an eccentric shaft sleeve 19, and the eccentric shaft sleeve 19 is connected to the output shaft of a reciprocating swing drive motor 18; it is characterized by the following steps:;

[0020] When the comb-tooth cleaning frame mechanism moves to the fly ash accumulation position at the left end of the comb-tooth plate stroke, the reciprocating swing drive motor 18 is started, and the connecting column 20 on the eccentric shaft sleeve 19 performs a circular motion around the central axis of the reciprocating swing drive motor 18. The connecting column 20 drives the swing rod 24 to swing back and forth through the connecting rod 21, the horizontal pull rod 22 and the hinge connection seat 23 in turn, thereby driving the central shaft 9 to reciprocate in the clockwise and counterclockwise directions in turn. The reciprocating rotation drives the shoulder-pole-shaped front crossbeam 10 and the shoulder-pole-shaped rear crossbeam 11 to synchronously perform seesaw motion, the left end of the shoulder-pole-shaped front crossbeam 10 passes through the left front suspension arm 12, and the left end of the shoulder-pole-shaped rear crossbeam 11 passes through the left rear suspension arm, synchronously driving the left toothed plate hanging longitudinal beam 14 to perform up and down reciprocating motion, and the left toothed plate hanging longitudinal beam 14 drives the left toothed plate 16 to perform up and down reciprocating sawing motion in the gaps between the tubes of the air preheater tube row, thereby realizing the removal of fly ash and scale in the gaps between the tubes;

[0021] Similarly, when the comb-tooth cleaning rack mechanism moves to the fly ash accumulation at the right end of the comb plate stroke, the reciprocating swing drive motor 18 is started to remove the fly ash accumulation in the gap between the pipes at the right end; thereby ensuring that the cleaning rack stroke is in place.

[0022] When the cleaning trolley driving mechanism 4 pulls the comb-tooth type cleaning frame to move horizontally, the reciprocating swing driving motor 18 is started at the same time, thereby realizing the horizontal movement and cleaning of the comb-tooth plate while shaking up and down.

Claims

1. A comb-tooth shaking ash cleaning device for cleaning scale deposits on an air preheater tube row of a biomass boiler, comprising a rectangular mounting bracket (25) of a ash cleaning trolley driving mechanism (4) and an air preheater tube row (1), a driving drive shaft (26) being arranged at the left end of the rectangular mounting bracket (25), a rear driving drive sprocket (28) being arranged at the rear end of the driving drive shaft (26), a front driving drive sprocket (32) being arranged at the front end of the driving drive shaft (26), a rear driven drive sprocket (29) being arranged at the rear side of the right end of the rectangular mounting bracket (25), and a rear driven drive sprocket (28) being arranged at the rear end of the rectangular mounting bracket (26). A front driven drive sprocket (33) is arranged at the front side of the right end of the bracket (25); a rear ring chain (30) is arranged between the rear active drive sprocket (28) and the rear driven drive sprocket (29); a front ring chain (34) is arranged between the front active drive sprocket (32) and the front driven drive sprocket (33); an active drive shaft drive sprocket (36) is arranged in the middle of the active drive shaft (26); the active drive shaft drive sprocket (36) is connected to the main drive motor (38) through the active drive shaft drive ring chain (37); the characteristic is that: A rear L-shaped connecting plate (31) is connected in series to the rear ring chain (30), the front end of the rear L-shaped connecting plate (31) is connected to the rear end of the moving cross beam (27), the right end of the rear L-shaped connecting plate (31) is connected to the left end of the rear traction rod (6), a front L-shaped connecting plate (35) is connected in series to the front ring chain (34), the rear end of the front L-shaped connecting plate (35) is connected to the front end of the moving cross beam (27), the right end of the front L-shaped connecting plate (35) is connected to the left end of the front traction rod (5), the moving cross beam (27) is movably arranged on the rectangular mounting bracket (25), and a reciprocating swing driving motor (27) is fixedly connected to the moving cross beam (27). 18); a rear trolley (2) for cleaning and a front trolley (3) for cleaning are arranged in parallel on the air preheater tube row (1); the right end of the front traction rod (5) is connected to the front trolley (3) for cleaning and the right end of the rear traction rod (6) is connected to the rear trolley (2) for cleaning and the front end bearing seat (7) of the central shaft is arranged on the front trolley (3); a rear end bearing seat (8) of the central shaft is arranged on the rear trolley (2); a central shaft (9) is arranged between the front end bearing seat (7) of the central shaft and the rear end bearing seat (8) of the central shaft; a shoulder pole-shaped front cross beam (10) and a shoulder pole-shaped rear cross beam (11) are fixedly connected to the central shaft (9), respectively; The shoulder-pole-shaped front cross beam (10), the central axis (9) and the shoulder-pole-shaped rear cross beam (11) are in the shape of an "I" character. A left front suspension arm (12) is hingedly connected to the left end of the shoulder-pole-shaped front cross beam (10), a left rear suspension arm is hingedly connected to the left end of the shoulder-pole-shaped rear cross beam (11), a left toothed plate suspension longitudinal beam (14) is connected between the lower end of the left front suspension arm (12) and the lower end of the left rear suspension arm, left toothed plates (16) are evenly suspended on the left toothed plate suspension longitudinal beam (14), a right front suspension arm (13) is hingedly connected to the right end of the shoulder-pole-shaped front cross beam (10), a right rear suspension arm is hingedly connected to the right end of the shoulder-pole-shaped rear cross beam (11), and a right toothed plate is connected between the lower end of the right front suspension arm (13) and the lower end of the right rear suspension arm. The side tooth plate is suspended on the longitudinal beam (15), and the right tooth plate (17) is suspended on the right tooth plate suspension longitudinal beam (15) at equal intervals. The left tooth plate (16) and the right tooth plate (17) are both arranged in the gap between the tubes of the air preheater tube row (1); a swing rod (24) is fixedly connected to the middle of the central shaft (9), a hinge connection seat (23) is arranged at the lower end of the swing rod (24), a horizontal pull rod (22) is hinged on the hinge connection seat (23), the left end of the horizontal pull rod (22) is hinged on a connecting rod (21), the left end of the connecting rod (21) is connected to a connecting column (20) on an eccentric shaft sleeve (19), and the eccentric shaft sleeve (19) is connected to the output shaft of a reciprocating swing drive motor (18).

2. The comb-tooth shaking cleaning device for fouling of air preheater tubes of a biomass boiler according to claim 1 is characterized in that: Saw teeth are arranged on the left end of the left tooth plate (16), and saw teeth are arranged on the right side of the right tooth plate (17).

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