An automatic coke cleaning and automatic spray angle control device for the black liquor spray gun of an alkali recovery boiler

Abstract

The invention discloses an automatic coke cleaning and automatic injection angle control device for a black liquor spray gun of a soda recovery boiler, which comprises a frame. The frame is provided with a guide groove, and a sliding table is arranged in the guide groove. A bracket is arranged at the front end of the sliding table, and a screw jack is arranged at the rear end. A rectangular support is arranged between the bracket and the screw jack. The lifting of the screw jack can drive the rectangular support to rotate around the bracket. A black liquor spray gun connecting pipe is arranged on the rectangular support. The front end of the black liquor spray gun connecting pipe is connected with a black liquor spray gun. A pressing device is arranged at the upper end of the black liquor spray gun connecting pipe to fix the black liquor spray gun connecting pipe on a semi-circular support. A cylinder is installed at the rear end of the rectangular support. The end of the piston rod of the cylinder is connected with a telescopic rod, and a coke cleaning scraper is installed at the other end of the telescopic rod. The device of the invention can realize automatic coke cleaning of the black liquor spray gun of the soda recovery boiler and automatically adjust the inclination angle of the black liquor spray gun, avoiding the accident of personnel scald caused by the high-temperature environment, and overall improving the high efficiency, safety, energy saving and environmental protection of the soda recovery boiler.

Description

Technical Field

[0001] The invention belongs to the technical field of soda pulping and papermaking, and particularly relates to an automatic coke cleaning device and an automatic injection angle control device for a black liquor spray gun in a soda recovery boiler. Background Art

[0002] In the soda pulping and papermaking industry, the pollution of papermaking black liquor is the most serious, and the soda recovery technology is the most effective method for treating papermaking black liquor at present. First, the papermaking black liquor is concentrated, and then it is sprayed into the soda recovery boiler through a black liquor spray gun for further drying, cracking and combustion. The concentrated black liquor is sprayed into the boiler through the spray gun, the water is removed by drying, the macromolecular organic matter is decomposed into small molecule compounds such as methane and hydrogen for combustion, and the unburned carbon and inorganic salts fall on the cushion for combustion. Under high temperature and oxygen-deficient conditions, sodium sulfate in the inorganic matter is reduced to sodium sulfide by carbon (carbon monoxide) on the cushion, and the molten matter is recovered to obtain usable alkali, and the heat generated by the combustion of the organic matter is absorbed by the boiler and converted into high-pressure steam. In order to establish a stable working condition, it is necessary to make the black liquor evenly distributed in the furnace and fully dried to create conditions for the combustion of the black liquor on the cushion.

[0003] The black liquor spray gun works in a high-temperature furnace of 1000°C. After the black liquor is atomized and burned, a large amount of coke is easily generated on the black liquor spray gun. The coke on the black liquor spray gun will cause blockage of the spray nozzle of the black liquor spray gun, affecting the spraying and atomization effects of the black liquor spray gun. The coke also contains high-concentration alkaline corrosion components. The black liquor spray gun is eroded by the external high temperature and corrosive coke in the furnace, and the black liquor spray gun is prone to corrosion, thinning and perforation, affecting the service life of the black liquor spray gun. The coke on the black liquor spray gun will seriously affect the normal operation of the soda recovery boiler, seriously affect the efficiency of the soda recovery boiler and increase the cost of replacing a new gun.

[0004] In order to maintain the stable combustion of the black liquor on the cushion, the operator needs to go to the site to observe the combustion condition on the cushion, and adjust the angle of the black liquor spray gun according to the combustion condition on the cushion in the furnace and the shape and position of the cushion. The black liquor is sprayed into the soda recovery boiler at different angles, which can effectively change the combustion condition on the cushion in the furnace, make the soda recovery boiler operate in the best state, and is beneficial to improving the working efficiency of the soda recovery boiler.

[0005] At present, only the manual timed coke cleaning method and the manual adjustment of the angle of the black liquor spray gun by observing the cushion condition can be used to solve this problem. However, the inlet of the black liquor spray gun is in a high-temperature state, and the working environment of the equipment is harsh. Due to the unstable negative pressure in the soda recovery boiler, the unburned black liquor often splashes out along with the flame. Even if the operator wears protective clothing during the coke cleaning process, scalding accidents still occur from time to time. Therefore, there is an urgent need for an automatic coke cleaning device and an automatic injection angle control system for the black liquor spray gun in the soda recovery boiler to ensure the stable operation of the soda recovery boiler. Summary of the Invention

[0006] To overcome the deficiencies of the above-mentioned existing technologies, the present invention provides an automatic coking removal and automatic spray angle control device for a black liquor spray gun in a soda recovery boiler. This device can achieve automatic coking removal of the black liquor spray gun in the soda recovery boiler, automatically adjust the tilt angle of the black liquor spray gun, change the combustion conditions of the cushion layer in the soda recovery boiler, eliminate the need for manual coking removal operations and adjustment of the tilt angle of the black liquor spray gun, avoid personal scalding accidents caused by high-temperature environments, and overall improve the efficiency, safety, energy conservation, and environmental protection of the soda recovery boiler.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] An automatic coking removal and automatic spray angle control device for a black liquor spray gun in a soda recovery boiler. The device includes a frame, one end of the frame is connected to the spray port panel of the soda recovery boiler, a guide groove is provided along the length direction of the frame, a sliding table is arranged in the guide groove, and the sliding table can translate back and forth along the guide groove;

[0009] A support is vertically provided at the front end of the sliding table, and a screw jack is arranged at the rear end. A rectangular support is provided between the support and the screw jack. The rectangular support is rotatably connected to the support through a rotating shaft and fixed on the screw jack. The lifting of the screw jack can drive the rectangular support to rotate around the support;

[0010] Semicircular supports are provided at both ends of the upper end surface of the rectangular support. A black liquor spray gun connecting pipe is arranged on the semicircular support. The front end of the black liquor spray gun connecting pipe is connected to the black liquor spray gun through a quick-change joint, and the rear end is connected to a black liquor hose. A pressing device is arranged on the upper end of the black liquor spray gun connecting pipe to fix the black liquor spray gun connecting pipe on the semicircular support;

[0011] A cylinder is installed at the rear end of the rectangular support. The end of the piston rod of the cylinder is connected to a telescopic rod. The telescopic rod penetrates through the other end of the rectangular support and extends out of the front end of the rectangular support. A coking removal scraper is installed at the extended end. The cylinder drives the telescopic rod and the coking removal scraper to move back and forth to clean the coking on the black liquor spray gun.

[0012] In the above technical solution, a guide cylinder is provided through the rectangular support along the length direction. The cylinder is installed at the rear end of the guide cylinder. The end of the piston rod of the cylinder is connected to one end of the telescopic rod through a floating joint. The telescopic rod is installed in the guide cylinder and extends out of the front end of the guide cylinder. The other end of the telescopic rod is installed with the coking removal scraper.

[0013] In the above technical solution, a roller support is installed at the front end of the rectangular support. Two guide rollers are installed on the roller support. The guide rollers clamp the telescopic rod to guide the telescopic rod. Rollers are respectively installed around the rear end of the telescopic rod. The rollers are in contact with the inner cavity of the rectangular support. The telescopic rod and the coking removal scraper move back and forth under the drive of the cylinder.

[0014] In the above technical solution, a swingable roller bracket is installed at the front end of the rectangular support. Two guiding rollers are installed at the front end of the swingable roller bracket. The guiding rollers clamp the telescopic rod to guide the telescopic rod. Rollers are respectively installed around the rear end of the telescopic rod. The rollers are in contact with the inner cavity of the rectangular support. Driven by the cylinder, the telescopic rod and the coke cleaning scraper move back and forth.

[0015] A swing shaft is provided in the middle of the swingable roller bracket. The fixed end of the swing shaft is installed at the front end of the rectangular support. Swing cylinder mounting brackets are provided on both sides of the rear end of the swingable roller bracket. Swing cylinders are installed on the swing cylinder mounting brackets. The swing cylinders are located on both sides of the rectangular support. The two swing cylinders act alternately to drive the guiding rollers to swing left and right, driving the telescopic rod to swing left and right, so that the coke cleaning scraper swings left and right.

[0016] In the above technical solution, the pressing device includes a rotating shaft, two pressing rods, a pressing component and two upper pressing blocks. The pressing device is rotationally connected to the semi-circular support through the rotating shaft. A groove for supporting the black liquor spray gun connecting pipe is provided on the semi-circular support. The lower end surface of the pressing rod is provided with a groove matching the one on the semi-circular support. When the pressing rod is pressed down, the two grooves form a circular space just for the black liquor spray gun connecting pipe to pass through. A lower pressing block is provided at a position on the upper end surface of the semi-circular support close to the groove and away from the rotating shaft side. The upper pressing block is arranged at a position opposite to the lower pressing block on the lower end surface of the pressing rod. When the pressing rod is pressed down, the upper pressing block and the lower pressing block are buckled. The pressing device and the semi-circular support are pressed tightly through the pressing component.

[0017] In the above technical solution, a corner pointer is installed on the rotating shaft. An angle display scale is installed at a position behind the corner pointer at the lower end of the bracket.

[0018] In the above technical solution, positioning hole plates are oppositely provided on the frame and the sliding table. A plurality of positioning holes are provided on the positioning hole plates. A positioning pin is provided between the two positioning hole plates on the same side. The relative position of the sliding table and the frame is adjusted by the position where the positioning pin is inserted into the positioning hole.

[0019] In the above technical solution, the device further includes a control system. A camera is installed above the alkali recovery boiler cushion layer to shoot the cushion layer state in real time and transmit the video to the control system. A camera is installed at the front end of the angle display scale to shoot the spraying angle in real time and transmit the video to the control system. The screw jack and the cylinder are electrically connected to the control system. The control system controls the working states of the screw jack and the cylinder.

[0020] In the above technical solution, the device further includes a control system. A camera is installed above the cushion layer of the alkali recovery boiler to capture the state of the cushion layer in real time and transmit the video to the control system. An angle sensor is installed at the rotating shaft to transmit the angle value to the control system. The screw lift and the cylinder are electrically connected to the control system, and the control system controls the working states of the screw lift and the cylinder.

[0021] In the above technical solution, the coke cleaning scraper is made of GH4145 stainless steel spring plate resistant to high temperature above 700°C and corrosion. The telescopic rod is made of 316 stainless steel square tube resistant to high temperature and corrosion. The guide cylinder, rectangular support, pressing device and semi-circular support are made of 304 stainless steel square tube.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. The present invention adopts an automatic control technology. The automatic coke removal device uses an automatically telescopic scraper to remove the coking blocks on the black liquor spray gun, eliminating the need for manual slag poking operation and avoiding personal scalding accidents caused by molten slag splashing in a high-temperature environment.

[0024] 2. The present invention adopts an automatic control technology to automatically adjust the inclination angle of the black liquor spray gun, changing the combustion condition of the cushion layer of the alkali recovery boiler. Without the need for manual adjustment of the angle of the black liquor spray gun, it not only avoids personal scalding accidents caused by molten slag splashing in a high-temperature environment but also enables remote control of the working state of the black liquor spray gun, ensuring that the alkali recovery boiler operates in an optimal state.

[0025] 3. The present invention features small investment, intelligence, and reliable operation. It can achieve online removal of coking blocks on the black liquor spray gun and online adjustment of the angle of the black liquor spray gun, greatly improving the operation safety and economy of the alkali recovery boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of one embodiment of the device of the present invention;

[0027] Figure 2 is Figure 1 a schematic structural diagram of the device after adjusting the inclination angle of the black liquor spray gun;

[0028] Figure 3 is a schematic structural diagram of one embodiment of the pressing device on the device of the present invention;

[0029] Figure 4 is a schematic structural diagram of one embodiment of the device of the present invention;

[0030] Figure 5 is a schematic structural diagram of one embodiment of the device of the present invention;

[0031] Figure 6 isFigure 4 Schematic diagram of the local structure in the embodiment;

[0032] Figure 7 is Figure 5 Schematic diagram of the local structure in the embodiment;

[0033] Wherein: 1. Black liquor spray gun; 2. Quick-release joint; 3. Black liquor spray gun connecting pipe; 4. Compression device; 4a. Rotating shaft; 4b. Compression bolt; 4c. Upper pressing block; 4d. Pressing rod; 4e. Eccentric wheel mechanism; 5. Semi-circular support; 5a. Lower pressing block; 6. Screw jack; 7. Cylinder; 8. Coke cleaning scraper; 9. Telescopic rod; 10. Guide cylinder; 11. Rectangular support; 12. Corner pointer; 13. Angle display scale; 14. Mounting flange; 15. Positioning hole plate; 16. Frame; 17. Slide; 18. Rotating shaft; 19. Angle sensor, 20. Camera, 21. Handwheel; 22. Positioning pin; 23. Guide groove; 24. Bracket; 25. Roller bracket; 26. Guide roller; 27. Swingable roller bracket; 28. Swing rotating shaft; 29. Swing cylinder; 30. Roller; 31. Swing cylinder mounting bracket. Detailed implementation manner

[0034] In order to better illustrate the purpose, technical solution and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments. The present invention can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the present invention to those skilled in the art. The present invention will only be defined by the claims.

[0035] As Figures 1-7 shown, an automatic coke cleaning and jet angle automatic control device for a black liquor spray gun of an alkali recovery boiler, the device includes a frame 16, one end of the frame 16 is provided with a mounting flange 14, and the frame 16 is connected to the alkali recovery boiler nozzle panel through the mounting flange 14. The frame 16 is provided with a guide groove 23 along the length direction, a slide 17 is arranged in the guide groove 23, rollers are arranged on both sides of the slide 17, a slide rail matched with the rollers is arranged in the guide groove 23, and the slide 17 can move back and forth along the guide groove 23 through the matching structure of the rollers and the chute.

[0036] A limit structure is arranged between the frame 16 and the slide 17, and the limit structure can adjust the relative position of the slide 17 and the frame 16. As one of the embodiments, positioning hole plates 15 are oppositely arranged on the frame 16 and the slide 17, a plurality of positioning holes are arranged on the positioning hole plates 15, as Figure 1 and 2 shown, each positioning hole plate 15 is provided with 5 positioning holes, and positioning pins 22 are arranged between the two positioning hole plates 15 on the same side, and the relative position of the slide 17 and the frame 16 is adjusted by the position where the positioning pins 22 are inserted into the positioning holes.

[0037] A bracket 24 is vertically provided at the front end of the sliding table 17, and a screw jack 6 is vertically provided at the rear end. The screw jack 6 can be manually or automatically selected. For example, Figure 1 and 2 as shown, a handwheel 21 is installed on the screw jack 6. Rotating the handwheel 21 can control the lifting of the screw jack 6. At the same time, the screw jack 6 can also be driven by a motor. A rectangular support 11 is provided between the bracket 24 and the screw jack 6. The rectangular support 11 is rotatably connected to the bracket 24 through a rotating shaft 18 and fixed on the screw jack 6. Rotating the handwheel 21 or driving the motor drives the screw jack 6 to lift, thereby driving the rectangular support 11 to rotate around the bracket 24, thereby driving the black liquor spray gun 1 to change the spraying angle. A corner pointer 12 is installed on the rotating shaft 18, and an angle display scale 13 is installed at a position behind the corner pointer 12 at the lower end of the bracket 24. The corner pointer 12 and the angle display scale 13 can intuitively display the tilt angle of the black liquor spray gun 1.

[0038] At both ends of the upper end surface of the rectangular support 11, there are semi-circular supports 5. A black liquor spray gun connecting pipe 3 is provided on the semi-circular supports 5. The front end of the black liquor spray gun connecting pipe 3 is connected to the black liquor spray gun 1 through a quick-change joint 2, and the rear end is connected to a black liquor hose. A pressing device 4 is provided at the upper end of the black liquor spray gun connecting pipe 3 to fix the black liquor spray gun connecting pipe 3 on the semi-circular support 5.

[0039] As one of the embodiments, the pressing device 4 includes a rotating shaft 4a, two pressing rods 4d, a pressing component, and two upper pressing blocks 4c. The pressing device 4 is rotatably connected to the semi-circular support 5 through the rotating shaft 4a. The pressing device 4 can be buckled with the semi-circular support 5 to realize the fixation or separation of the black liquor spray gun connecting pipe 3, which is convenient for the disassembly of the black liquor spray gun connecting pipe 3. A groove for supporting the black liquor spray gun connecting pipe 3 is provided on the semi-circular support 5. A positioning boss is provided below the black liquor spray gun connecting pipe 3. The matching structure of the groove and the positioning boss keeps the installation direction of the black liquor spray gun connecting pipe 3 accurate. The lower end surface of the pressing rod 4d is provided with a groove matching the semi-circular support 5. When the pressing rod 4d is pressed down, the two grooves form a circular space just for the black liquor spray gun connecting pipe 3 to pass through. A lower pressing block 5a is provided at a position near the groove on the side of the upper end surface of the semi-circular support 5 away from the rotating shaft 4a. The upper pressing block 4c is arranged at a position opposite to the lower pressing block 5a on the lower end surface of the pressing rod 4d. When the pressing rod 4d is pressed down, the upper pressing block 4c and the lower pressing block 5a are buckled, and the pressing device 4 and the semi-circular support 5 are pressed tightly through the pressing component.

[0040] As one of the embodiments, the upper pressing block 4c and the lower pressing block 5a can be 90-degree hook structures, which are formed by bending and extending the corresponding positions on the sides of the semi-circular support 5 and the pressing rod 4d. The pressing component can be a pressing bolt 4b or an eccentric wheel mechanism 4e.

[0041] A cylinder 7 is installed at the rear end of the rectangular support 11. The end of the piston rod of the cylinder 7 is connected to a telescopic rod 9. The telescopic rod 9 passes through the other end of the rectangular support 11 and extends out of the front end of the rectangular support 11. A coke-removing scraper 8 is installed at the extending end. The cylinder 7 drives the telescopic rod 9 and the coke-removing scraper 8 to move back and forth, and can regularly clean the coke on the black liquor spray gun 1. When the black liquor spray gun 1 needs to be replaced, first pull out the positioning pin 22, move the sliding table 17 along the guiding groove 23 of the frame 16 to the rear end. The black liquor spray gun 1 is located outside the furnace. Loosen the pressing device 4, remove the black liquor spray gun 1 together with the black liquor spray gun connecting pipe 3. After replacing the black liquor spray gun 1, restore it to the working state.

[0042] As one of the embodiments, as Figure 1 and 2 shown, a guiding cylinder 10 is provided through the rectangular support 11 along the length direction. One end of the guiding cylinder 10 has a flange, and the rear end of the rectangular support 11 also has a flange. The flange of the guiding cylinder 10 is fixed to the flange of the rectangular support 11 with bolts. A cylinder 7 is also installed on the flange of the guiding cylinder 10. The end of the piston rod of the cylinder 7 is connected to one end of the telescopic rod 9 through a floating joint. The telescopic rod 9 is installed in the guiding cylinder 10 and extends out of the front end of the guiding cylinder 10. The other end of the telescopic rod 9 is installed with a coke-removing scraper 8. The cylinder 7 drives the telescopic rod 9 and the coke-removing scraper 8 to move back and forth to clean the coke on the black liquor spray gun 1.

[0043] As one of the embodiments, as Figure 4 shown, a roller support 25 is installed at the front end of the rectangular support 11. Two guiding rollers 26 are installed on the roller support 25. The guiding rollers 26 clamp the telescopic rod 9 from four directions of up, down, left and right to guide the telescopic rod 9. Rollers 30 are installed around the rear end of the telescopic rod 9. The rollers 30 around the rear end of the telescopic rod 9 are in contact with the inner cavity of the rectangular support 11. The inner cavity of the rectangular support 11 can guide the telescopic rod 9. Driven by the cylinder 7, the telescopic rod 9 can move back and forth.

[0044] As one of the embodiments, as Figure 5 shown, a swingable roller support 27 is installed at the front end of the rectangular support 11. Two guiding rollers 26 are installed at the front end of the swingable roller support 27. The guiding rollers 26 clamp the telescopic rod 9 from four directions of up, down, left and right to guide the telescopic rod 9. Rollers 30 are installed around the rear end of the telescopic rod 9. The rollers 30 around the rear end of the telescopic rod 9 are in contact with the inner cavity of the rectangular support 11. The inner cavity of the rectangular support 11 can guide the telescopic rod 9. Driven by the cylinder 7, the telescopic rod 9 can move back and forth.

[0045] There is a swing rotating shaft 28 in the middle of the swing roller bracket 27. The fixed end of the swing rotating shaft 28 is installed at the front end of the rectangular support 11. On both sides of the rear end of the swing roller bracket 27, there are swing cylinder mounting brackets 31. A swing cylinder 29 is installed on the swing cylinder mounting brackets 31. The swing cylinder 29 is located on both sides of the rectangular support 11. The two swing cylinders 29 act alternately to drive the guide roller 26 at the front end of the swing roller bracket 27 to swing left and right, driving the telescopic rod 9 to swing left and right, so that the coke scraping blade 8 at the front end of the telescopic rod 9 swings left and right.

[0046] The device of the present invention further includes a control system, and the injection angle control is realized through the control system. As one of the embodiments, a camera is installed above the alkali furnace cushion layer to continuously shoot the cushion layer state and transmit the video to the control system. A camera 20 is installed at the front end of the angle display dial 13 to continuously shoot the injection angle and transmit the video to the control system. The screw lift 6 and the cylinder 7 are electrically connected to the control system, and the control system controls the working states of the screw lift 6 and the cylinder 7. The operator observes the injection angle video of each black liquor spray gun 1 through the display device connected to the control system. Combining the information fed back by other furnace combustion condition monitoring instruments, the injection angle change of each black liquor spray gun 1 can be remotely controlled, so as to realize the on-line adjustment and control of the furnace combustion condition.

[0047] As another embodiment, a camera is installed above the alkali furnace cushion layer to continuously shoot the cushion layer state and transmit the video to the control system. An angle sensor 19 is installed at the rotating shaft 18 and transmits the angle value to the control system. The screw lift 6 and the cylinder 7 are electrically connected to the control system, and the control system controls the working states of the screw lift 6 and the cylinder 7. The operator observes the injection angle value of each black liquor spray gun 1 through the display device connected to the control system. Combining the information fed back by other furnace combustion condition monitoring instruments, the injection angle change of each black liquor spray gun 1 can be remotely controlled, so as to realize the on-line adjustment and control of the furnace combustion condition.

[0048] In addition, the coke scraping blade 8 is made of GH4145 stainless steel spring plate resistant to high temperature above 700 °C and corrosion. The telescopic rod 9 is made of 316 stainless steel square tube resistant to high temperature and corrosion. The guide cylinder 10, the rectangular support 11, the pressing device 4 and the semi-circular support 5 are made of 304 stainless steel square tube. The rest are made of carbon steel materials. The cylinder piston ring and the shaft seal are made of tetrapropyl fluororubber resistant to temperature above 150 degrees.

[0049] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. An automatic coking removal and automatic spray angle control device for the black liquor spray gun of an alkali recovery boiler, characterized in that: It includes a frame (16), one end of the frame (16) is connected to the alkali recovery boiler spout panel, a guiding groove (23) is provided along the length direction of the frame (16), a sliding table (17) is arranged in the guiding groove (23), and the sliding table (17) can be translated back and forth along the guiding groove (23); A bracket (24) is vertically arranged at the front end of the sliding table (17), and a screw jack (6) is arranged at the rear end. A rectangular support (11) is arranged between the bracket (24) and the screw jack (6). The rectangular support (11) is rotatably connected to the bracket (24) through a rotating shaft (18) and fixed on the screw jack (6). The lifting of the screw jack (6) can drive the rectangular support (11) to rotate around the bracket (24); Semicircular supports (5) are arranged at both ends of the upper end surface of the rectangular support (11). A black liquor spray gun connecting pipe (3) is arranged on the semicircular supports (5). The front end of the black liquor spray gun connecting pipe (3) is connected to a black liquor spray gun (1) through a quick-change joint (2), and the rear end is connected to a black liquor hose. A pressing device (4) is arranged at the upper end of the black liquor spray gun connecting pipe (3) to fix the black liquor spray gun connecting pipe (3) on the semicircular supports (5); A cylinder (7) is installed at the rear end of the rectangular support (11). The end of the piston rod of the cylinder (7) is connected to a telescopic rod (9). The telescopic rod (9) penetrates through the other end of the rectangular support (11) and extends out of the front end of the rectangular support (11). A coke cleaning scraper (8) is installed at the extending end. The cylinder (7) drives the telescopic rod (9) and the coke cleaning scraper (8) to move back and forth to clean the coke on the black liquor spray gun (1); A guiding cylinder (10) is arranged longitudinally through the rectangular support (11). The cylinder (7) is installed at the rear end of the guiding cylinder (10). The end of the piston rod of the cylinder (7) is connected to one end of the telescopic rod (9) through a floating joint. The telescopic rod (9) is installed in the guiding cylinder (10) and extends out of the front end of the guiding cylinder (10). The other end of the telescopic rod (9) is installed with the coke cleaning scraper (8); A roller bracket (25) is installed at the front end of the rectangular support (11). Two guiding rollers (26) are installed on the roller bracket (25). The guiding rollers (26) clamp the telescopic rod (9) to guide the telescopic rod (9). Rollers (30) are respectively installed around the rear end of the telescopic rod (9). The rollers (30) are in contact with the inner cavity of the rectangular support (11). Driven by the cylinder (7), the telescopic rod (9) and the coke cleaning scraper (8) move back and forth.

2. The device according to claim 1, wherein: A swingable roller bracket (27) is installed at the front end of the rectangular support (11). Two guiding rollers (26) are installed at the front end of the swingable roller bracket (27). The guiding rollers (26) clamp the telescopic rod (9) to guide the telescopic rod (9). Rollers (30) are respectively installed around the rear end of the telescopic rod (9). The rollers (30) are in contact with the inner cavity of the rectangular support (11). Driven by the cylinder (7), the telescopic rod (9) and the coke cleaning scraper (8) move back and forth; A swingable roller bracket (27) is provided with a swing rotating shaft (28) in the middle. The fixed end of the swing rotating shaft (28) is installed at the front end of the rectangular support (11). Swing cylinder mounting brackets (31) are provided on both sides of the rear end of the swingable roller bracket (27). A swing cylinder (29) is installed on the swing cylinder mounting brackets (31). The swing cylinder (29) is located on both sides of the rectangular support (11). The two swing cylinders (29) act alternately to drive the guide roller (26) to swing left and right, driving the telescopic rod (9) to swing left and right, so that the coke removing scraper (8) swings left and right.

3. The device according to claim 1, characterized in that: The pressing device (4) includes a rotating shaft (4a), two pressing rods (4d), a pressing assembly, and two upper pressing blocks (4c). The pressing device (4) is rotatably connected to the semi-circular support (5) through the rotating shaft (4a). A groove for supporting the black liquor spray gun connecting pipe (3) is provided on the semi-circular support (5). A groove matching the one on the semi-circular support (5) is provided on the lower end surface of the pressing rod (4d). When the pressing rod (4d) is pressed down, the two grooves form a circular space just for the black liquor spray gun connecting pipe (3) to pass through. A lower pressing block (5a) is provided at a position near the groove on the upper end surface of the semi-circular support (5) away from the rotating shaft (4a). The upper pressing block (4c) is arranged at a position opposite to the lower pressing block (5a) on the lower end surface of the pressing rod (4d). When the pressing rod (4d) is pressed down, the upper pressing block (4c) and the lower pressing block (5a) are buckled. The pressing device (4) and the semi-circular support (5) are pressed tightly through the pressing assembly.

4. The device according to claim 1, characterized in that: A corner pointer (12) is installed on the rotating shaft (18). An angle display scale (13) is installed at a position behind the corner pointer (12) at the lower end of the bracket (24).

5. The device according to claim 1, characterized in that: Positioning hole plates (15) are oppositely arranged on the frame (16) and the sliding table (17). A plurality of positioning holes are provided on the positioning hole plates (15). A positioning pin (22) is provided between the two positioning hole plates (15) on the same side. The relative position of the sliding table (17) and the frame (16) is adjusted by inserting the positioning pin (22) into the positioning holes.

6. The device according to claim 4, characterized in that: The device further includes a control system. A camera is installed above the alkali recovery boiler cushion layer to continuously shoot the cushion layer state and transmit the video to the control system. A camera (20) is installed at the front end of the angle display scale (13) to continuously shoot the spraying angle and transmit the video to the control system. The screw jack (6) and the cylinder (7) are electrically connected to the control system. The control system controls the working states of the screw jack (6) and the cylinder (7).

7. The device according to claim 1, characterized in that: The device further includes a control system. A camera is installed above the alkali recovery boiler cushion layer to continuously shoot the cushion layer state and transmit the video to the control system. An angle sensor (19) is installed at the rotating shaft (18) and transmits the angle value to the control system. The screw jack (6) and the cylinder (7) are electrically connected to the control system. The control system controls the working states of the screw jack (6) and the cylinder (7).

8. The device according to claim 1, characterized in that: The decoking scraper (8) is made of a GH4145 stainless steel spring plate resistant to high temperatures above 700°C and corrosion, the telescopic rod (9) is made of a 316 stainless steel square tube resistant to high temperatures and corrosion, and the guide cylinder (10), rectangular support (11), pressing device (4) and semi-circular support (5) are made of 304 stainless steel square tubes.

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