Comb tooth type ash removal frame mechanism capable of effectively removing boiler air pre-heater pipe row scale

Abstract

The utility model discloses a comb tooth type ash removal frame mechanism capable of effectively removing accumulated scale of a pipe row of an air preheater of a boiler. The comb tooth type ash removal frame mechanism solves the problem that in the prior art, the effect of removing fly ash accumulated scale at the end of the air preheater of a biomass circulating fluidized bed boiler is poor. The ash removal comb tooth frame is arranged on a center supporting shaft, namely, the front end and the rear end of the center supporting shaft are each fixedly connected with a shoulder-pole-shaped swing rod, the left ends of the two shoulder-pole-shaped swing rods are connected with a left longitudinal beam round pipe, a left comb tooth plate is hinged to the left longitudinal beam round pipe in a hanging mode, and the right ends of the two shoulder-pole-shaped swing rods are connected with a right longitudinal beam round pipe. A right comb plate is hinged to a right longitudinal beam round pipe in a hanging mode, the center supporting shaft is driven by the eccentric swing rod mechanism to periodically swing in the forward direction and the reverse direction, the two shoulder-pole-shaped swing rods do seesaw movement, and therefore the comb plate can repeatedly saw and cut accumulated scales in the air pre-heater pipe row, and the accumulated scales are effectively cleared away.

Description

Technical Field

[0001] The utility model relates to an air preheater of a circulating fluidized bed boiler, in particular to a comb-tooth type dust cleaning frame mechanism which can effectively remove the scale deposited on the tube row of the air preheater of the 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 patent number 2022219089407 and 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 tail end of the comb plate stroke are repeatedly squeezed, the more they are squeezed, the shorter the stroke of the comb plate is. The patent adopts an upwardly inclined guide plate at the end of the comb plate stroke, so that when the circular shaft connected to the comb plate moves to the guide plate 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, which has the effect of removing the end deposits; but for circulating fluidized bed boilers fueled by biomass fuel, the fly ash deposits have strong adhesion due to the nature of the fuel, and the one-way one-time lifting and sawing using the above-mentioned patented technical solution has limited effect on removing the deposits. Summary of the invention

[0004] The utility model provides a comb-tooth type ash cleaning frame mechanism which can effectively remove scale deposited on boiler air preheater tubes, solving the technical problem that the prior art has poor effect in removing fly ash scale deposited on the end of a biomass circulating fluidized bed boiler air preheater.

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

[0006] The overall concept of the utility model is as follows: a dust cleaning comb frame is arranged on a central supporting shaft, that is, a shoulder-pole shaped swing rod is fixedly connected to each of the front and rear ends of the central supporting shaft, the left ends of the two shoulder-pole shaped swing rods are connected to the left longitudinal beam circular tube, the left comb tooth plate is hingedly suspended on the left longitudinal beam circular tube, the right ends of the two shoulder-pole shaped swing rods are connected to the right longitudinal beam circular tube, the right comb tooth plate is hingedly 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, the two shoulder-pole shaped swing rods are realized to make a seesaw motion, so that the comb tooth plate repeatedly saws the scale in the air preheater tube row, and the scale is effectively cleaned.

[0007] A comb-tooth type ash cleaning frame mechanism which can effectively remove the scale deposited in the tube row of the boiler air preheater comprises the tube row of the air preheater and the driving mechanism of the ash cleaning trolley, a rear ash cleaning trolley and a front ash cleaning trolley are arranged in parallel on the tube row of the air preheater, a front traction rod is arranged between the driving mechanism of the ash cleaning trolley and the front ash cleaning trolley, a rear traction rod is arranged between the driving mechanism of the ash cleaning trolley and the rear ash cleaning trolley, a front end bearing seat of the center shaft is arranged on the front ash cleaning trolley, a rear end bearing seat of the center shaft is arranged on the rear ash cleaning trolley, a center shaft is arranged between the front end bearing seat of the center shaft and the rear end bearing seat of the center shaft, a shoulder pole-shaped front cross beam and a shoulder pole-shaped rear cross beam are respectively fixedly connected to the center shaft, the shoulder pole-shaped front cross beam, the center shaft and the shoulder pole-shaped rear cross beam are in the shape of an "I", a left front suspension arm is hinged at the left end of the shoulder pole-shaped front cross beam, and a left front suspension arm is hinged at the left end of the shoulder pole-shaped rear cross beam. A left rear boom is hinged on the left end of the beam, 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, left toothed plates are hung on the left toothed plate hanging longitudinal beam at equal intervals, a right front boom is hinged on the right end of the shoulder-pole-shaped front crossbeam, a right rear boom is hinged on the right end of the shoulder-pole-shaped rear crossbeam, a right toothed plate hanging longitudinal beam is connected between the lower end of the right front boom and the lower end of the right rear boom, right toothed plates are hung on the right toothed plate hanging longitudinal beam at equal intervals, and both the left and right toothed plates are arranged in the inter-tube gaps 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, 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 method for sawing and cleaning scale on a tube row of an air preheater of a boiler is carried out by a comb-tooth cleaning rack mechanism, the comb-tooth cleaning rack mechanism comprises an air preheater tube row and a cleaning trolley driving mechanism, a cleaning rear trolley and a cleaning front trolley are arranged in parallel on the air preheater tube row, a central shaft front end bearing seat is arranged on the cleaning front trolley, a central shaft rear end bearing seat is arranged on the cleaning rear trolley, a central shaft is arranged between the central shaft front end bearing seat and the central shaft rear end bearing seat, a shoulder pole-shaped front cross beam and a shoulder pole-shaped rear cross beam are respectively fixedly connected to the central shaft, a left front suspension arm is hinged at the left end of the shoulder pole-shaped front cross beam, a left rear suspension arm is hinged at the left end of the shoulder pole-shaped rear cross beam, and a left side suspension arm is connected between the lower end of the left front suspension arm and the lower end of the left rear suspension arm. The toothed plate is connected to the longitudinal beam, and the left toothed plate is evenly connected to the left toothed plate connecting the longitudinal beam, the right front arm is hinged to the right end of the shoulder-pole-shaped front cross beam, the right rear arm is hinged to the right end of the shoulder-pole-shaped rear cross beam, the right toothed plate is connected to the longitudinal beam between the lower end of the right front arm and the lower end of the right rear arm, and the right toothed plate is evenly connected to the right toothed plate connecting longitudinal beam, and the left toothed plate and the right toothed plate are both arranged in the gap between the tubes of the air preheater tube row; the swing rod is fixedly connected to the middle part of the central axis, and a hinge connection seat is arranged at the lower end of the swing rod, and a horizontal pull rod is hinged on the hinge connection seat, and the left end of the horizontal pull rod is hinged to a connecting rod, and 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 driving 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] A front traction rod is arranged between the driving mechanism of the cleaning trolley and the front trolley for cleaning, and a rear traction rod is arranged between the driving mechanism of the cleaning trolley and the rear trolley for cleaning; 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 of the comb-tooth plate for cleaning while shaking up and down.

[0012] The present invention sets the sawtooth plates at the two ends of the seesaw frame which can swing left and right, and utilizes the eccentric shaft sleeve on the motor driving shaft to realize the up and down shaking of the cleaning frame, so as to saw 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 type cleaning frame mechanism which can effectively remove the scale deposited on the tube row of the air preheater of the boiler comprises an air preheater tube row 1 and a cleaning trolley driving mechanism 4, on which a cleaning rear trolley 2 and a cleaning front trolley 3 are arranged in parallel at intervals in front and back, a front traction rod 5 is arranged between the cleaning trolley driving mechanism 4 and the cleaning front trolley 3, a rear traction rod 6 is arranged between the cleaning trolley driving mechanism 4 and the cleaning rear trolley 2, the front traction rod 5 and the rear traction rod 6 synchronously pull the two cleaning trolleys to move left and right for cleaning, a central shaft front end bearing seat 7 is arranged on the cleaning front trolley 3, and a central shaft front end bearing seat 7 is arranged on the cleaning rear trolley 2 is provided with a bearing seat 8 at the rear end of the central shaft, a central shaft 9 is provided between the bearing seat 7 at the front end of the central shaft and the bearing seat 8 at the rear end 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 shaft 9 and the shoulder pole-shaped rear cross beam 11 are in the shape of an "I", and two seesaws are formed in parallel front and back with the central shaft 9 as a fulcrum, a left front suspension arm 12 is hinged at the left end of the shoulder pole-shaped front cross beam 10, a left rear suspension arm is hinged at the left end of the shoulder pole-shaped rear cross beam 11, and 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 connected to the left toothed plate hanging longitudinal beam 14. 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. The right front suspension arm 13 is hinged to the right end of the shoulder-pole-shaped front cross beam 10, and the right rear suspension arm is hinged to the right end of the shoulder-pole-shaped rear cross beam 11. The 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 evenly connected to the right toothed plate hanging longitudinal beam 15. The left toothed plates 16 and the right toothed plates 17 are both provided with It is placed in the gap between the tubes of the air preheater tube row 1, so that the sawtooth plate makes a reciprocating sawing motion up and down in the gap between the air preheater tube rows; a swing rod 24 is fixedly connected to the middle of the central axis 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 at 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 driving motor 18, and the rotation of the reciprocating swing driving motor 18 provides power for the sawtooth plate to make a reciprocating sawing motion up and down in the gap between the air preheater tube rows.

[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 method for sawing and cleaning scale deposited on a tube row of an air preheater of a boiler is carried out by a comb-tooth cleaning frame mechanism, the comb-tooth cleaning frame mechanism comprising an air preheater tube row 1 and a cleaning trolley driving mechanism 4, a cleaning rear trolley 2 and a cleaning front trolley 3 are arranged in parallel on the air preheater tube row 1, a central shaft front end bearing seat 7 is arranged on the cleaning front trolley 3, a central shaft rear end bearing seat 8 is arranged on the cleaning rear trolley 2, a central shaft 9 is arranged between the central shaft front end bearing seat 7 and the central shaft rear end bearing seat 8, a shoulder pole-shaped front cross beam 10 and a shoulder pole-shaped rear cross beam 11 are respectively fixedly connected to the central shaft 9, a left front suspension arm 12 is hinged at the left end of the shoulder pole-shaped front cross beam 10, a left rear suspension arm is hinged at the left end of the shoulder pole-shaped rear cross beam 11, a left tooth 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 tooth plates 16 are evenly connected to the plate-connected longitudinal beam 14, a right front suspension arm 13 is hinged to the right end of the shoulder-pole-shaped front cross beam 10, a right rear suspension arm is hinged to the right end of the shoulder-pole-shaped rear cross beam 11, a right tooth plate-connected 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 tooth plates 17 are evenly connected to the right tooth plate-connected longitudinal beam 15. The left tooth plates 16 and the right tooth plates 17 are both arranged in the air preheater. The device is provided with a swing rod 24 fixedly connected to the middle of the central axis 9, a hinge connection seat 23 is provided 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 at the left end of the horizontal pull rod 22, and a connecting rod 21 is connected at the left end to a connecting column 20 on an eccentric sleeve 19, and the eccentric 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 gap between the tubes of the air preheater tube row 1, thereby realizing the removal of fly ash fouling in the gap 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] A front traction rod 5 is arranged between the cleaning trolley driving mechanism 4 and the front trolley 3 for cleaning, and a rear traction rod 6 is arranged between the cleaning trolley driving mechanism 4 and the rear trolley 2 for cleaning; 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 of the comb-tooth plate for cleaning while shaking up and down.

Claims

1. A comb-tooth type cleaning rack mechanism capable of effectively removing scale deposits on a boiler air preheater tube row, comprising an air preheater tube row (1) and a cleaning trolley driving mechanism (4), a cleaning rear trolley (2) and a cleaning front trolley (3) being arranged in parallel on the air preheater tube row (1), a front traction rod (5) being arranged between the cleaning trolley driving mechanism (4) and the cleaning front trolley (3), and a rear traction rod (6) being arranged between the cleaning trolley driving mechanism (4) and the cleaning rear trolley (2), characterized in that: A front end bearing seat (7) of the central shaft is arranged on the front trolley (3) for cleaning and moving, a rear end bearing seat (8) of the central shaft is arranged on the rear trolley (2) for cleaning and moving, 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 respectively fixedly connected to the central shaft (9), and the shoulder pole-shaped front cross beam (10), the central shaft (9) and the rear end bearing seat (8) of the central shaft are arranged between the front end bearing seat (7) and the rear end bearing seat (8) of the central shaft. ) 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 spacedly suspended on the left toothed plate suspension longitudinal beam (14), and a left toothed plate (16) is hingedly connected to the shoulder-pole-shaped front cross beam (10) at a lower end of the left front suspension arm (12). ) is hingedly connected to the right end of a right front suspension arm (13), a right rear suspension arm is hingedly connected to the right end of a shoulder-pole-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, right toothed plates (17) are evenly connected to the right toothed plate suspension longitudinal beam (15), and both the left toothed plate (16) and the right toothed plate (17) are arranged in the gaps between the tubes of the air preheater tube row (1); at the center axis ( A swing rod (24) is fixedly connected to the middle part of the swing rod (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 a connecting column (20) on the eccentric shaft sleeve (19), and the eccentric shaft sleeve (19) is connected to the output shaft of the reciprocating swing drive motor (18).

2. The comb-tooth cleaning rack mechanism for effectively removing scale deposits from boiler air preheater tubes 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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