Soot blowing device for nozzle of coal-fired burner

Abstract

The invention discloses a coal-fired burner nozzle soot blowing device, and relates to the technical field of burner soot cleaning, the coal-fired burner nozzle soot blowing device comprises a combustion furnace, the top of the combustion furnace is fixedly provided with a feed inlet, the surface of the combustion furnace is provided with a control device, the surface of the combustion furnace is fixedly provided with an incinerator, and the incinerator is fixedly provided with a nozzle. A nozzle is fixedly installed on the surface of the incinerator, the vent holes are formed in the circumferential face of the sleeve, the gasket is rotationally installed at the end, close to the incinerator, of the sleeve, the air draft pump is fixedly installed on the circumferential face of the sleeve, the vent pipe fixedly penetrates through the inner wall and the outer wall of the sleeve, and the fixing rod is fixedly installed on the inner wall of the sleeve. And the suction opening is fixedly installed at the end, away from the sleeve, of the fixing rod, dust in the nozzle flows through negative pressure generated by the suction pump, the situation that the combustion efficiency of the combustion furnace is reduced due to excessive dust accumulation in the nozzle is prevented, and the stability during operation is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of burner soot cleaning, in particular to a soot blowing device at a nozzle of a coal-fired burner. Background Art

[0002] The soot blowing device at the nozzle of coal-fired burner is a device used to remove ash and carbon deposits generated during the combustion process of coal-fired boilers.

[0003] The patent with patent announcement number CN217635685U relates to a soot blowing device for an incinerator burner, including a blast chamber composed of an inner tube, an outer tube, a mounting base plate and a spray ring base plate, and a spray port composed of a spray ring and an annular axial air jet. The device can spray high-pressure soot blowing wind in a vertical direction to destroy the negative pressure generated when the burner is running, eliminate the aggregation and coking phenomenon formed by the suction and reflux of salt particles, reduce labor difficulty, and extend the service life of the incinerator burner.

[0004] In the above patent, high-pressure soot blowing air can be sprayed in the vertical direction to destroy the negative pressure generated when the burner is running, eliminate the aggregation and coking phenomenon formed by the suction and reflux of salt particles, reduce the labor difficulty, and extend the service life of the incinerator burner. However, when soot is blown from the nozzle, the dust after high-temperature combustion will clump, and the agglomerated dust is more difficult to clean when using a pneumatic device for soot blowing. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a sootblowing device for a coal-fired burner nozzle, which solves the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a coal-fired burner nozzle sootblowing device, comprising a combustion furnace, a feed port is fixedly installed on the top of the combustion furnace, a control device is arranged on the surface of the combustion furnace, an incinerator is fixedly installed on the surface of the combustion furnace, a nozzle is fixedly installed on the surface of the incinerator, the combustion furnace is connected with the incinerator, a circular hole is opened on the circumferential surface of the nozzle, and a ash cleaning device, a disassembly device and a protective device are arranged on the surface of the incinerator;

[0007] The dust cleaning device comprises: a gasket, a fixing rod, a ventilation pipe, an exhaust pump, a ventilation hole, a sleeve, an exhaust port, a positioning rod, an electric push rod and a scraper. The sleeve is arranged on the circumferential surface of the nozzle. The ventilation hole is opened on the side of the sleeve away from the incinerator. The gasket is rotatably installed at the end of the sleeve close to the incinerator. The exhaust pump is fixedly installed on the circumferential surface of the sleeve. The ventilation pipe is fixedly penetrated through the inner and outer walls of the sleeve. The fixing rod is fixedly installed on the inner wall of the sleeve. The exhaust port is fixedly installed on the end of the fixing rod away from the sleeve. The exhaust pump is connected with the exhaust port through the ventilation pipe. The positioning rod is fixedly installed on the inner wall of the sleeve. The electric push rod is fixedly installed on the end of the positioning rod away from the sleeve. The scraper is slidably installed on the output end surface of the electric push rod. When the scraper moves toward the nozzle, the scraper contacts the nozzle for a while. When the dust agglomerates due to the high temperature generated by combustion in the nozzle, the scraper moves to contact the agglomerated dust. The scraper cleans the agglomerated dust through the sliding connection design of the scraper and the output end of the electric push rod.

[0008] According to the above technical solution, the scraper is in contact with the nozzle, and a fixing piece is provided at one end of the positioning rod close to the electric push rod, and the electric push rod is fixed by the fixing piece.

[0009] According to the above technical solution, a reset spring is arranged between the scraper and the output end of the electric push rod, the shape of the ventilation hole is set to be T-shaped, and the scraper is reset by the reset spring.

[0010] According to the above technical scheme, the disassembly device includes: a pull rod, a hollow box, a limit rod, a sliding plate, a through rod, a rubber arc rod, a cushion block and a partition. The pull rod is fixedly installed on the circumferential surface of the gasket, the hollow box is fixedly installed on the inner wall of the circumferential surface of the gasket, the limit rod is fixedly installed on the side of the nozzle away from the incinerator, the sliding plate is slidably installed on the inner wall of the hollow box, the partition is fixedly installed on the surface of the hollow box, the through rod slides through the inner and outer walls of the partition, the through rod is fixedly installed on the side of the sliding plate close to the partition, the rubber arc rod is fixedly installed on one end of the through rod away from the sliding plate, and the cushion block is fixedly installed on the side of the partition away from the rubber arc rod. The movement of the sliding plate will drive the through rod to move in the direction of the partition, and the movement of the through rod will drive the rubber arc rod to move in the direction of the partition. After the rubber arc rod moves, it contacts the limit rod. After the rubber arc rod contacts the limit rod, the rubber arc rod limits the limit rod.

[0011] According to the above technical solution, a No. 1 spring is arranged between the sliding plate and the hollow box, the rubber arc rod is in contact with the limit rod, and the sliding plate is driven to reset by the No. 1 spring.

[0012] According to the above technical solution, the protective device includes: a clamping plate, a rotating plate and a blocking block, the clamping plate is fixedly installed on the inner wall of the nozzle, the rotating plate is rotatably installed between the clamping plates, and the blocking block slides through the inner and outer walls of the nozzle. After the blocking block moves to the top, the triangular block moves to the bottom and contacts the transmission block. The movement of the triangular block to the bottom will push the transmission block to move in the direction of the blocking block, and the blocking block will block the transmission block so that the transmission block cannot continue to move.

[0013] According to the above technical solution, the protective device also includes: a long rod, a friction block, a triangular block, a transmission block and a storage box. The long rod slides through the inner and outer walls of the hollow box, the long rod is fixedly mounted on a side of the sliding plate away from the penetration rod, the friction block is fixedly mounted on an end of the long rod away from the sliding plate, the storage box is fixedly mounted on the circumferential surface of the nozzle, the triangular block is slidably mounted on the inner wall of the storage box, and the transmission block slides through the inner and outer walls of the storage box. The friction block moves and contacts with the triangular block. After the friction block contacts with the triangular block, resistance will be generated due to friction. After the resistance between the friction block and the triangular block increases, the rotation speed of the gasket will be limited when the device is disassembled.

[0014] According to the above technical solution, a No. 2 spring is arranged between the triangular block and the storage box, and a torsion spring is arranged between the rotating plate and the clamping plate, and the No. 2 spring is used to drive the triangular block to reset.

[0015] The present invention provides a soot blowing device for a coal-fired burner nozzle, which has the following beneficial effects:

[0016] (1) The invention generates negative pressure through an exhaust pump to make the dust in the nozzle flow, thereby cleaning the dust more quickly and effectively, preventing excessive accumulation of dust in the nozzle that would reduce the combustion efficiency of the combustion furnace, and ensuring stability during operation. The sliding connection design between the scraper and the output end of the electric push rod prevents the scraper from being damaged during cleaning when the dust is too agglomerated. The invention can perform deep cleaning on dust that is difficult to clean, preventing dust agglomeration from affecting air circulation during combustion and causing backfire during combustion.

[0017] (2) The invention allows the device to be quickly disassembled by moving the through rod and the rubber arc rod so that the device is no longer in contact with the incinerator, saving disassembly time and allowing the next combustion to be carried out quickly. After the rubber arc rod contacts the limit rod, the rubber arc rod limits the limit rod, allowing for quick installation, reducing the maintenance time when the device is cleaned, and improving work efficiency.

[0018] (3) The invention limits the speed of rotation of the gasket to prevent the device from falling due to the overall weight of the device when the worker disassembles the device too quickly, thereby increasing the processing time of the worker. The transmission block is blocked by the blocking block, making it unable to move further. When it is detected that the inside of the nozzle is being cleaned, the device cannot be disassembled, preventing the worker from disassembling the device without realizing that the cleaning work has not been completed. The invention is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the cross-sectional structure of the casing of the present invention;

[0021] Figure 3 It is a schematic diagram of the structure of the dust cleaning device of the present invention;

[0022] Figure 4 This is a schematic diagram of the position relationship between the fixing rod and the sleeve of the present invention;

[0023] Figure 5 This is a schematic diagram of the cross-sectional structure of the hollow box of the present invention;

[0024] Figure 6 It is a schematic diagram of the structure of the protective device of the present invention;

[0025] Figure 7 It is a schematic diagram of the cross-sectional structure of the storage box of the present invention.

[0026] In the figure: 1. combustion furnace; 2. feed port; 3. incinerator; 4. nozzle; 51. gasket; 52. fixing rod; 53. ventilation pipe; 54. exhaust pump; 55. ventilation hole; 56. sleeve; 57. exhaust port; 58. positioning rod; 59. electric push rod; 510. scraper; 61. pull rod; 62. hollow box; 63. limit rod; 64. sliding plate; 65. through rod; 66. rubber arc rod; 67. pad; 68. No. 1 spring; 69. partition; 71. long rod; 72. friction block; 73. triangle block; 74. No. 2 spring; 75. transmission block; 76. splint; 77. rotating plate; 78. blocking block; 79. storage box. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-Figure 4 , one embodiment of the present invention is: a coal-fired burner nozzle soot blowing device, comprising a combustion furnace 1, a feed port 2 is fixedly installed on the top of the combustion furnace 1, a control device is arranged on the surface of the combustion furnace 1, an incinerator 3 is fixedly installed on the surface of the combustion furnace 1, a nozzle 4 is fixedly installed on the surface of the incinerator 3, the combustion furnace 1 is connected with the incinerator 3, a circular hole is opened on the circumferential surface of the nozzle 4, and a ash cleaning device is arranged on the surface of the incinerator 3, the ash cleaning device comprises: a gasket 51, a fixing rod 52, a ventilation pipe 53, an exhaust pump 54, a ventilation hole 55, a sleeve 56, an exhaust port 57, a positioning rod 58, an electric push rod 59 and a scraper 510, the sleeve 56 is arranged on the circumferential surface of the nozzle 4, the ventilation hole 55 is opened on the side of the sleeve 56 away from the incinerator 3, the gasket 51 is rotatably installed on one end of the sleeve 56 close to the incinerator 3, the exhaust pump 54 is fixedly installed on the circumferential surface of the sleeve 56, and the ventilation pipe 53 is fixedly penetrated On the inner and outer walls of the sleeve 56, the fixing rod 52 is fixedly installed on the inner wall of the sleeve 56, the exhaust port 57 is fixedly installed on the end of the fixing rod 52 away from the sleeve 56, the exhaust pump 54 is connected with the exhaust port 57 through the ventilation pipe 53, and the negative pressure generated by the exhaust pump 54 causes the dust in the nozzle 4 to flow, so that the dust can be cleaned more quickly and effectively, and the excessive accumulation of dust in the nozzle 4 can be prevented, which will reduce the combustion efficiency of the combustion furnace 1 and ensure the stability during operation. The positioning rod 58 is fixedly installed on the inner wall of the sleeve 56, and the electric push rod 59 is fixedly installed on the end of the positioning rod 58 away from the sleeve 56. The scraper 510 is slidably installed on the output end surface of the electric push rod 59 to prevent the scraper 510 from being damaged during cleaning when the dust is too agglomerated. The dust that is difficult to clean can be deeply cleaned to prevent the dust from agglomerating and affecting the air circulation during combustion, resulting in backfire during combustion.

[0029] The scraper 510 is in contact with the nozzle 4, and a fixing piece is provided at one end of the positioning rod 58 close to the electric push rod 59, and the electric push rod 59 is fixed by the fixing piece.

[0030] A return spring is arranged between the scraper 510 and the output end of the electric push rod 59, and the shape of the ventilation hole 55 is set to be T-shaped, and the scraper 510 is driven to return to its original position by the return spring.

[0031] When the present embodiment is working, the exhaust pump 54 is started, and the exhaust pump 54 draws air from the nozzle 4 through the ventilation pipe 53 and the exhaust port 57 and generates negative pressure. After the negative pressure is generated in the nozzle 4, the negative pressure will be released through the opening of the nozzle 4. After the negative pressure is released, the dust in the nozzle 4 will move in the direction away from the nozzle 4. After the dust moves, it moves in the direction away from the nozzle 4 through the ventilation hole 55 and flows out of the incinerator 3 and the nozzle 4. The negative pressure generated by the exhaust pump 54 causes the dust in the nozzle 4 to flow, so that the dust can be cleaned more quickly and effectively, and the excessive accumulation of dust in the nozzle 4 can be prevented, which will reduce the combustion efficiency of the combustion furnace 1 and ensure the stability of the operation. The electric push rod 59 is moved, and the movement of the output end of the electric push rod 59 will drive the scraper 510 to move. When the scraper 510 moves toward the nozzle 4, the scraper 510 will contact the nozzle 4 for a while. When dust agglomerates due to the high temperature generated by combustion in the nozzle 4, the scraper 510 will move and contact the agglomerated dust. The scraper 510 will clean the agglomerated dust. The sliding connection design between the scraper 510 and the output end of the electric push rod 59 can prevent the scraper 510 from being damaged during cleaning when the dust agglomerates too seriously. The dust that is more difficult to clean can be deeply cleaned to prevent the agglomeration of dust from affecting the air circulation during combustion and causing backfire during combustion.

[0032] See also Figure 1-Figure 7 On the basis of the above embodiment, in another embodiment of the present invention, a disassembly device and a protective device are provided on the surface of the incinerator 3, wherein the disassembly device comprises: a pull rod 61, a hollow box 62, a limit rod 63, a sliding plate 64, a through rod 65, a rubber arc rod 66, a cushion block 67 and a partition 69, the pull rod 61 is fixedly mounted on the circumferential surface of the gasket 51, the hollow box 62 is fixedly mounted on the inner wall of the circumferential surface of the gasket 51, the limit rod 63 is fixedly mounted on the side of the nozzle 4 away from the incinerator 3, and the sliding plate 64 is slidably mounted on the inner wall of the hollow box 62 The partition 69 is fixedly installed on the surface of the hollow box 62, and the penetrating rod 65 slides through the inner and outer walls of the partition 69. The penetrating rod 65 is fixedly installed on the side of the sliding plate 64 close to the partition 69, so that the device can be quickly disassembled, saving disassembly time and quickly carrying out the next combustion. The rubber arc rod 66 is fixedly installed on the end of the penetrating rod 65 away from the sliding plate 64, and the pad 67 is fixedly installed on the side of the partition 69 away from the rubber arc rod 66, so that it can be quickly installed, reducing the maintenance time of the device during cleaning, and improving work efficiency.

[0033] A No. 1 spring 68 is provided between the sliding plate 64 and the hollow box 62 , and the rubber arc rod 66 is in contact with the limiting rod 63 , and the sliding plate 64 is driven to reset through the No. 1 spring 58 .

[0034] The protective device includes: a clamping plate 76, a rotating plate 77 and a blocking block 78. The clamping plate 76 is fixedly installed on the inner wall of the nozzle 4, the rotating plate 77 is rotatably installed between the clamping plates 76, and the blocking block 78 slides through the inner and outer walls of the nozzle 4, so that the device cannot be disassembled when it is detected that the inside of the nozzle 4 is being cleaned, preventing the staff from disassembling the device without realizing that the cleaning work has not been completed. The protective device is highly practical.

[0035] The protective device also includes: a long rod 71, a friction block 72, a triangular block 73, a transmission block 75 and a storage box 79. The long rod 71 slides through the inner and outer walls of the hollow box 62, the long rod 71 is fixedly mounted on the side of the sliding plate 64 away from the penetration rod 65, the friction block 72 is fixedly mounted on the end of the long rod 71 away from the sliding plate 64, the storage box 79 is fixedly mounted on the circumferential surface of the nozzle 4, the triangular block 73 is slidably mounted on the inner wall of the storage box 79, and the transmission block 75 slides through the inner and outer walls of the storage box 79 to prevent the device from falling due to the overall weight of the equipment when the disassembly is completed too quickly by manual labor, thereby increasing the processing time available for staff operation.

[0036] A No. 2 spring 74 is provided between the triangular block 73 and the storage box 79 , and a torsion spring is provided between the rotating plate 77 and the clamping plate 76 , so that the triangular block 73 is reset by the No. 2 spring 74 .

[0037] When the present embodiment is working, the pull rod 61 is manually pulled, and when the pull rod 61 rotates toward the bottom, the rotation of the pull rod 61 drives the washer 51 to rotate, and the rotation of the washer 51 drives the hollow box 62 to rotate, and the rotation of the hollow box 62 drives the sliding plate 64 to move away from the partition 69, and the movement of the sliding plate 64 drives the through rod 65 to move away from the partition 69, and the movement of the through rod 65 drives the rubber arc rod 66 to move away from the partition 69. After the rubber arc rod 66 moves, it is no longer in contact with the limit rod 63, the rubber arc rod 66 no longer contacts the limiting rod 63, and the rubber arc rod 66 no longer limits the limiting rod 63. After the limiting rod 63 loses its limit, the sleeve 56 is pulled in a direction away from the nozzle 4. The movement of the sleeve 56 drives the gasket 51 to move away from the nozzle 4. The movement of the gasket 51 drives the hollow box 62 to move. The movement of the hollow box 62 drives the sliding plate 64 to move. The movement of the sliding plate 64 drives the penetration rod 65 and the rubber arc rod 66 to move. The penetration rod 65 and the rubber arc rod 66 After the arc rod 66 moves, the device is no longer in contact with the incinerator 3, so the device can be quickly disassembled, saving disassembly time and allowing the next combustion to be quickly carried out. The sleeve 56 is pushed toward the direction of the nozzle 4. The movement of the sleeve 56 will drive the gasket 51 to move toward the direction of the nozzle 4. After the gasket 51 moves, it contacts the nozzle 4. Then, the pull rod 61 is rotated toward the top. When the pull rod 61 is rotated toward the top, the rotation of the pull rod 61 will drive the gasket 51 to rotate. The rotation of the gasket 51 will drive the hollow box 62 to rotate. The rotation of the hollow box 62 will drive the sliding plate 64 to move toward the direction of the partition 69. The movement of the sliding plate 64 will drive the through rod 65 to move toward the direction of the partition 69. The movement of the through rod 65 will drive the rubber arc rod 66 to move toward the direction of the partition 69. After the rubber arc rod 66 moves, it contacts the limit rod 63. After the rubber arc rod 66 contacts the limit rod 63, the rubber arc rod 66 limits the limit rod 63, allowing for quick installation, reducing the maintenance time of the device during dust cleaning, and improving work efficiency.

[0038] The movement of the sliding plate 64 in the direction away from the partition 69 will drive the long rod 71 to move, and the movement of the long rod 71 will drive the friction block 72 to move in the direction away from the partition 69. The movement of the friction block 72 will contact the triangular block 73. After the friction block 72 contacts the triangular block 73, the friction will generate resistance due to friction. The increased resistance between the friction block 72 and the triangular block 73 will limit the rotation speed of the gasket 51 when the device is disassembled, so as to prevent the device from falling due to the overall weight of the device when the manual disassembly is completed too quickly, thereby increasing the handling time of the staff during operation and generating a After the negative pressure, the rotating plate 77 is affected by the negative pressure and rotates toward the top. The rotation of the rotating plate 77 will contact the blocking block 78. The rotation of the rotating plate 77 will push the blocking block 78 to move toward the top. After the blocking block 78 moves to the top, the triangular block 73 moves to the bottom and contacts the transmission block 75. The movement of the triangular block 73 to the bottom will push the transmission block 75 to move in the direction of the blocking block 78. The blocking block 78 will block the transmission block 75, making it impossible for the transmission block 75 to continue moving, so that the device cannot be disassembled when it is detected that the dust cleaning is being carried out inside the nozzle 4, preventing the staff from disassembling the device without realizing that the dust cleaning work has not been completed. It is highly practical.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sootblowing device for a coal-fired burner nozzle, comprising a combustion furnace (1), characterized in that: A feed port (2) is fixedly mounted on the top of the combustion furnace (1), a control device is arranged on the surface of the combustion furnace (1), an incinerator (3) is fixedly mounted on the surface of the combustion furnace (1), a nozzle (4) is fixedly mounted on the surface of the incinerator (3), the combustion furnace (1) is connected to the incinerator (3), a circular hole is formed on the circumferential surface of the nozzle (4), and a ash cleaning device, a disassembly device and a protective device are arranged on the surface of the incinerator (3); The dust cleaning device comprises: a gasket (51), a fixing rod (52), a ventilation pipe (53), an exhaust pump (54), a ventilation hole (55), a sleeve (56), an exhaust port (57), a positioning rod (58), an electric push rod (59) and a scraper (510), wherein the sleeve (56) is arranged on the circumferential surface of the nozzle (4), the ventilation hole (55) is opened on the side of the sleeve (56) away from the incinerator (3), the gasket (51) is rotatably mounted on one end of the sleeve (56) close to the incinerator (3), the exhaust pump (54) is fixedly mounted on the circumferential surface of the sleeve (56), and the The ventilation pipe (53) is fixedly installed on the inner and outer walls of the sleeve (56); the fixing rod (52) is fixedly installed on the inner wall of the sleeve (56); the exhaust port (57) is fixedly installed on the end of the fixing rod (52) away from the sleeve (56); the exhaust pump (54) is connected to the exhaust port (57) through the ventilation pipe (53); the positioning rod (58) is fixedly installed on the inner wall of the sleeve (56); the electric push rod (59) is fixedly installed on the end of the positioning rod (58) away from the sleeve (56); and the scraper (510) is slidably installed on the output end surface of the electric push rod (59).

2. A sootblowing device for a coal-fired burner nozzle according to claim 1, characterized in that: The scraper (510) is in contact with the nozzle (4), and a fixing piece is provided at one end of the positioning rod (58) close to the electric push rod (59).

3. A sootblowing device for a coal-fired burner nozzle according to claim 2, characterized in that: A return spring is arranged between the scraper (510) and the output end of the electric push rod (59), and the shape of the ventilation hole (55) is set to be T-shaped.

4. A sootblowing device for a coal-fired burner nozzle according to claim 3, characterized in that: The disassembly device comprises: a pull rod (61), a hollow box (62), a limit rod (63), a sliding plate (64), a through rod (65), a rubber arc rod (66), a cushion block (67) and a partition (69), wherein the pull rod (61) is fixedly mounted on the circumferential surface of the gasket (51), the hollow box (62) is fixedly mounted on the inner wall of the circumferential surface of the gasket (51), the limit rod (63) is fixedly mounted on the side of the nozzle (4) away from the incinerator (3), and the sliding plate (64) slides The partition (69) is fixedly mounted on the surface of the hollow box (62), the through rod (65) slides through the inner and outer walls of the partition (69), the through rod (65) is fixedly mounted on a side of the sliding plate (64) close to the partition (69), the rubber arc rod (66) is fixedly mounted on an end of the through rod (65) away from the sliding plate (64), and the cushion block (67) is fixedly mounted on a side of the partition (69) away from the rubber arc rod (66).

5. A sootblowing device for a coal-fired burner nozzle according to claim 4, characterized in that: A No. 1 spring (68) is arranged between the sliding plate (64) and the hollow box (62), and the rubber arc rod (66) is in contact with the limiting rod (63).

6. A sootblowing device for a coal-fired burner nozzle according to claim 5, characterized in that: The protective device comprises: a clamping plate (76), a rotating plate (77) and a blocking block (78); the clamping plate (76) is fixedly mounted on the inner wall of the nozzle (4); the rotating plate (77) is rotatably mounted between the clamping plates (76); and the blocking block (78) slides through the inner and outer walls of the nozzle (4).

7. A sootblowing device for a coal-fired burner nozzle according to claim 6, characterized in that: The protective device further comprises: a long rod (71), a friction block (72), a triangular block (73), a transmission block (75) and a storage box (79); the long rod (71) slides through the inner and outer walls of the hollow box (62); the long rod (71) is fixedly mounted on a side of the sliding plate (64) away from the penetration rod (65); the friction block (72) is fixedly mounted on an end of the long rod (71) away from the sliding plate (64); the storage box (79) is fixedly mounted on the circumferential surface of the nozzle (4); the triangular block (73) is slidably mounted on the inner wall of the storage box (79); and the transmission block (75) slides through the inner and outer walls of the storage box (79).

8. A sootblowing device for a coal-fired burner nozzle according to claim 7, characterized in that: A No. 2 spring (74) is provided between the triangular block (73) and the storage box (79), and a torsion spring is provided between the rotating plate (77) and the clamping plate (76).

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