An efficient denitration system for industrial solid waste furnaces

Abstract

The present application relates to the technical field of flue gas denitrification, and discloses a high-efficiency denitrification system for an industrial solid waste furnace, which includes a spray gun, a liquid injection mechanism for inputting urea solution into the spray gun, and an air injection mechanism for inputting high-pressure air into the spray gun. The spray gun includes a gun barrel, a plurality of nozzles spaced apart on both sides of the gun barrel, and a plurality of discharge holes for outputting urea solution are provided on the nozzle. The spray gun is provided with a cleaning mechanism for unblocking the discharge holes. The cleaning mechanism includes a bracket mounted on the gun barrel, two movable rods slidably mounted on the bracket, a plurality of base blocks connected to the movable rods, a pin fixed to the base block on one side of the gun barrel, and a drive assembly for driving the two movable rods to move toward or away from each other. The number of pins is equal to the number of discharge holes and corresponds one to one. Each pin can be moved into or out of an adjacent discharge hole under the action of the drive assembly. When the nozzle is clogged, the present application can use the cleaning mechanism to unblock the discharge hole, thereby achieving high flue gas denitrification efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of flue gas denitrification, and in particular to a high-efficiency denitrification system for an industrial solid waste furnace. Background Art

[0002] During the combustion process of power plants, nitrogen in the fuel reacts with oxygen to produce nitrogen oxides (NOx). These oxides are harmful to the environment and human health, and the government has clear regulations on NOx emissions from industrial facilities such as thermal power plants. Therefore, effective denitrification measures are required to reduce the NOx content in flue gas before it is discharged.

[0003] In the relevant technology, commonly used flue gas denitrification technologies include SNCR and SCR. The working principle of SNCR is to use a spray gun to spray a reducing agent such as urea solution into a position suitable for denitrification reaction in the boiler without a catalyst, so that the reducing agent and the flue gas are fully mixed, and the nitrogen oxides in the flue gas are selectively reduced to nitrogen and water, thereby removing nitrogen oxides in the flue gas.

[0004] However, in practical application, the SNCR technology suffers from the inevitable presence of impurities in the urea solution. If these impurities are not filtered out before being injected into the spray gun, the nozzle can easily become clogged. Furthermore, after spraying stops, some urea solution inevitably remains in the spray gun. This residual urea solution can dry and solidify, particularly in high-temperature boilers, and can easily clog the nozzle after long-term use. Once the nozzle becomes clogged, the amount of urea solution sprayed from the spray gun decreases, reducing the denitrification efficiency of the flue gas. This issue warrants improvement. Summary of the Invention

[0005] In order to improve the problem of nozzles being easily clogged and improve the denitrification efficiency of flue gas, the present application provides an industrial solid waste furnace high-efficiency denitrification system.

[0006] The present application provides an industrial solid waste furnace high-efficiency denitrification system that adopts the following technical solutions:

[0007] A high-efficiency denitrification system for an industrial solid waste furnace comprises a spray gun mounted on a boiler, a liquid injection mechanism for inputting a urea solution into the spray gun, and an air injection mechanism for inputting high-pressure air into the spray gun. The spray gun comprises a gun rod and a plurality of nozzles spaced apart on both sides of the gun rod. The nozzles are located inside the boiler and are provided with a plurality of discharge holes for outputting the urea solution. The spray gun is provided with a cleaning mechanism for unblocking the discharge holes. The cleaning mechanism comprises a bracket mounted on the gun rod, two movable rods slidably arranged on the bracket, a plurality of base blocks connected to the movable rods, a plurality of ejectors fixed on the side of the base blocks facing the gun rod, and a drive assembly for driving the two movable rods to move toward or away from each other. The number of the ejectors is equal to and corresponds one to one to the discharge holes, and each ejector can be moved into or out of an adjacent discharge hole under the action of the drive assembly.

[0008] By adopting the above technical solution, when the denitrification system is working, the liquid injection mechanism will input the prepared urea solution into the spray gun, and the gas injection mechanism will input high-pressure air into the spray gun, so that the urea solution is atomized through the nozzle and sprayed into the boiler to reduce the nitrogen oxides in the flue gas into nitrogen and water.

[0009] If the nozzle is clogged during the operation of the denitrification system, the driving assembly can be turned on to make the two movable rods drive the base blocks connected to them to move toward each other, and then each ejector pin can be inserted into the corresponding discharge hole, so that the impurities accumulated in the discharge hole can be crushed by the ejector pin, so that the fine impurities can be blown away from the discharge hole by the high-pressure air in the spray gun. The present application can not only use the cleaning mechanism to synchronously dredge each discharge hole after the nozzle is clogged to remove the impurities clogged in the discharge hole; it can also adopt an irregular dredging method to intermittently move the ejector pin in or out of the discharge hole on the nozzle to prevent the discharge hole from being clogged after long-term use, thereby ensuring the liquid output of the spray gun per unit time and improving the denitrification efficiency.

[0010] Optionally, the driving assembly includes a bidirectional screw rotatably arranged on the bracket, a driven gear fixedly connected to the bidirectional screw, a driving gear meshed on one side of the driven gear, and a servo motor for driving the driving gear to rotate circumferentially, the servo motor is installed on the bracket, the bidirectional screw has two threaded sections with opposite thread directions, and the two movable rods are respectively threadedly connected to different threaded sections of the bidirectional screw.

[0011] By adopting this technical solution, when the servo motor is operating, the driving gear first rotates synchronously with the servo motor's output shaft, which in turn causes the driven gear to drive the bidirectional lead screw. Because the movable rods are slidably mounted on the bracket and each movable rod engages with a different threaded segment of the bidirectional lead screw, the two movable rods are forced to move synchronously toward or away from each other during the bidirectional lead screw's rotation, causing each ejector pin to move synchronously into or out of adjacent discharge holes. This synchronous movement of each ejector pin requires only one servo motor to provide power, resulting in excellent linkage, high dredging efficiency, and resource conservation.

[0012] Optionally, the circumferential side wall of the gun rod is provided with a first external thread located outside the boiler, and the bracket includes a mounting ring threadedly connected to the first external thread, and a rotating handle is fixed to the circumferential side wall of the mounting ring.

[0013] By adopting this technical solution, the bracket is mounted on the gun barrel via a threaded connection, allowing the bracket to rotate relative to the spray gun. When the cleaning mechanism is not in use, the operator can control the mounting ring with a handle to rotate the movable rod, causing the base block and ejector to rotate synchronously. This allows the ejector to be staggered with the discharge hole, preventing the cleaning mechanism from affecting the spray of urea solution from the spray gun.

[0014] Optionally, the drive assembly is located on the outside of the boiler, and the circumferential side wall of the gun rod is provided with a second external thread at the end away from the mounting ring, and a positioning ring is threadedly connected to the second external thread, and two vertically extending positioning holes are provided on the positioning ring, and each movable rod is slidably set in an adjacent positioning hole at one end away from the bracket.

[0015] With this technical solution, the denitrification reaction in SNCR technology must be controlled at temperatures above 850 degrees Celsius, resulting in relatively high temperatures at the corresponding spray gun locations within the boiler. Placing the drive assembly outside the boiler not only reduces the impact of high temperatures and flue gas dust on the servo motor, ensuring stable operation, but also facilitates observation of the active lever position to determine whether the ejector pin has entered the discharge port.

[0016] Furthermore, because one end of the movable rod slides into the positioning hole, the wall of the positioning hole constrains the movable rod from rotating synchronously with the bidirectional screw during circumferential rotation, thereby controlling the movable rod's direction of motion and facilitating precise movement of the ejector pin into the discharge hole. A positioning ring is connected to the gun barrel via a second external thread. When the bracket rotates relative to the gun barrel, the movable rod transmits torque to the positioning ring, causing it to rotate relative to the gun barrel, preventing separation of the positioning ring from the movable rod.

[0017] Optionally, an abutment block is slidably provided in the positioning hole, the abutment block is located between the movable rod and the gun rod, and an abutment spring is provided between the abutment block and the hole wall of the positioning hole, the abutment spring is used to drive the abutment block to push the movable rod to the side away from the gun rod.

[0018] By adopting the above technical solution, when the threads on the surface of the bidirectional screw are worn, the abutment spring can drive the movable rod to move to the side away from the gun rod, so as to prevent the movable rod from falling under the action of its own gravity, causing the ejector pin to extend into the discharge hole, which will not affect the discharge of the nozzle.

[0019] Optionally, the side wall of the boiler is provided with a clearance opening for the sliding movement of the movable rod, and the movable rod is fixedly connected to a block located on the outside of the boiler, the cross-sectional area of the block is larger than the cross-sectional area of the clearance opening, and the block can block the clearance opening when it moves to abut against the boiler.

[0020] By adopting the above technical solution, the clearance opening can provide sliding space for the movable rod to ensure normal sliding of the movable rod. When the cleaning mechanism is not in use, the block can block the opening of the clearance opening to prevent smoke in the boiler from being discharged from the clearance opening.

[0021] Optionally, a limiting ring is fixed to the circumferential side wall of the gun rod, and the limiting ring is located on the side of the first external thread away from the boiler; when the mounting ring abuts against the limiting ring, the movable rod is in a state of aligning the ejector pin with the discharge hole.

[0022] By adopting the above technical solution, when the cleaning mechanism needs to be used, the mounting ring is rotated toward the side close to the limiting ring. The limiting ring can limit the mounting ring, which is conducive to the precise alignment of the ejector pin and the discharge hole.

[0023] Optionally, the gun rod is fixed with extension tubes having the same number as the nozzles, and the nozzles are detachably connected to the extension tubes.

[0024] By adopting the above technical solution, the nozzle is detachable instead of being fixedly connected to the gun barrel, so that the nozzle can be removed from the gun barrel, so as to facilitate the replacement of a severely clogged nozzle, or to select a nozzle with different discharge holes to be connected to the gun barrel according to needs, which is highly practical.

[0025] Optionally, a connecting stud is fixed on a side of the base block facing the movable rod, and a connecting screw hole that is threadably matched with the connecting stud is provided on the movable rod.

[0026] By adopting the above technical solution, the base block is installed on the movable rod by cooperating with the connecting stud and the connecting screw hole, so that the base block can be removed from the movable rod to facilitate replacement of the base block with corresponding matching ejector pins according to the number and position of the discharge holes on the nozzle, and the cleaning mechanism has strong adaptability.

[0027] Optionally, the boiler includes a furnace body and a protective plate detachably arranged on the furnace body, and each of the spray guns is installed on the protective plate.

[0028] By adopting the above technical solution, when the nozzle or base block needs to be replaced, the protective plate can be removed from the furnace body first, so that multiple spray guns can be moved out of the furnace body synchronously, thereby expanding the operating space of the hands and improving the replacement efficiency.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. When the nozzle is clogged, turn on the drive assembly to make the two movable rods move toward each other, and the ejector pin will move into the corresponding discharge hole to clear the discharge hole, thereby ensuring the liquid output of the spray gun per unit time and improving the denitrification efficiency;

[0031] 2. The mounting ring is threaded onto the gun barrel, allowing the bracket to rotate relative to the gun barrel. This allows the ejector pin to be misaligned with the discharge hole when the cleaning mechanism is not in use, thereby reducing the impact of the cleaning mechanism on the liquid discharge of the spray gun. The limit ring acts as a limit during the rotation of the mounting ring, facilitating the ejector pin to be aligned with the discharge hole.

[0032] 3. The nozzle can be detachably connected to the gun barrel, and the base block can be detachably connected to the movable rod. In actual application, the operator can choose to install the nozzle with different discharge holes on the gun barrel and the base block with corresponding ejector pins on the movable rod according to the needs, so as to adapt to different liquid discharge requirements and have strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural diagram of an embodiment of the present application.

[0034] Figure 2 It is a cross-sectional schematic diagram of an embodiment of the present application.

[0035] Figure 3 It is a side view of the protective plate, spray gun and cleaning mechanism in the embodiment of the present application.

[0036] Figure 4 It is a structural diagram of the spray gun and cleaning mechanism in the embodiment of the present application.

[0037] Figure 5 It is a partial exploded schematic diagram highlighting the drive assembly and connecting studs in the embodiment of the present application.

[0038] Figure 6 This is a partial schematic diagram of the ejector pin when it is rotated to be misaligned with the discharge hole in the embodiment of the present application.

[0039] Description of reference numerals:

[0040] 1. Boiler; 11. Furnace body; 12. Protective plate; 121. Clearance opening; 2. Spray gun; 21. Gun barrel; 211. Extension pipe; 212. Flange; 213. First external thread; 214. Second external thread; 215. Limiting ring; 216. Abutment ring; 22. Nozzle; 221. Discharge hole; 3. Liquid injection mechanism; 31. Liquid storage tank; 32. Liquid injection pump; 33. Liquid guide tube; 34. Liquid injection pipe; 4. Gas injection mechanism; 41. Air compressor; 42. Air injection pipe; 5. Cleaning mechanism; 51. Bracket; 511. Mounting ring; 512. Extension block; 513. Turn handle; 52. Movable rod; 521. Connecting screw hole; 53. Base block; 531. Connecting stud; 54. Ejector pin; 55. Drive assembly; 551. Bidirectional screw rod; 552. Driven gear; 553. Driving gear; 554. Servo motor; 56. Stop block; 6. Positioning ring; 61. Positioning hole; 62. Abutment block; 63. Abutment spring. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1-6 This application is described in further detail.

[0042] The embodiment of the present application discloses a high-efficiency denitrification system for an industrial solid waste furnace.

[0043] Reference Figure 1 、 Figure 2 The high-efficiency denitrification system for an industrial solid waste furnace includes multiple spray guns 2 mounted on a boiler 1, a liquid injection mechanism 3 for synchronously injecting urea solution into each spray gun 2, and an air injection mechanism 4 for synchronously injecting high-pressure air into the spray guns 2. The boiler 1 includes a furnace body 11 and a protective plate 12 detachably mounted on the furnace body 11. Each spray gun 2 is fixedly connected to the protective plate 12. Specifically, the protective plate 12 is preferably connected to the furnace body 11 by bolts.

[0044] Reference Figure 2 The injection mechanism 3 includes a liquid storage tank 31, an injection pump 32 disposed on one side of the liquid storage tank 31, a liquid guide tube 33 connecting the liquid storage tank 31 and the inlet of the injection pump 32, and an injection pipe 34 connected between the outlet of the injection pump 32 and the liquid inlet of each spray gun 2. The prepared urea solution is stored in the liquid storage tank 31. When the injection pump 32 is turned on, the urea solution in the liquid storage tank 31 is transferred to the liquid inlet of each spray gun 2 through the injection pipe 34, so that the urea solution can be sprayed into the boiler 1 using the spray gun 2.

[0045] Reference Figure 2 The gas injection mechanism 4 includes an air compressor 41 and an air injection pipe 42 connected between the air compressor 41 and the air inlet of the spray gun 2. The high-pressure gas generated by the air compressor 41 can enter the spray gun 2 along the air injection pipe 42 to provide power for atomizing and spraying the urea solution.

[0046] Reference Figure 3 、 Figure 4 The spray gun 2 includes a gun barrel 21 and multiple nozzles 22 spaced apart at the upper and lower sides of the gun barrel 21. Specifically, several extension tubes 211 are fixed to the circumferential sidewalls of the gun barrel 21, and each nozzle 22 is detachably mounted on the extension tube 211 via a threaded connection. A flange 212 is fixed to the circumferential sidewalls of the gun barrel 21, and the flange 212 is bolted to the protective plate 12 to securely mount the spray gun 2 to the boiler 1. Once installed, the nozzles 22 are located within the boiler 1, and each nozzle 22 is circumferentially defined with multiple discharge holes 221. Urea solution in the gun barrel 21 is atomized and sprayed out along the discharge holes 221, allowing the urea solution to come into contact with nitrogen oxides in the flue gas, thereby reducing the nitrogen oxides to nitrogen and water.

[0047] Reference Figure 4 、 Figure 5 Each spray gun 2 is equipped with a cleaning mechanism 5 for clearing the discharge hole 221 provided in the nozzle 22. The cleaning mechanism 5 comprises a bracket 51, two movable rods 52 slidably mounted on the bracket 51, a plurality of base blocks 53 detachably connected to the movable rods 52, a plurality of ejector pins 54 fixed to the side of the base blocks 53 facing the gun barrel 21, and a drive assembly 55 for driving the two movable rods 52 toward or away from each other. A connecting stud 531 is fixed to the side of the base blocks 53 facing the movable rods 52. The movable rods 52 are provided with connecting screw holes 521 that threadably engage with the connecting studs 531, thereby achieving a detachable connection between the base blocks 53 and the movable rods 52. The number of base blocks 53 is equal to the number of nozzles 22, and the number and distribution of ejector pins 54 on each base block 53 are the same as the discharge hole 221 on the nozzle 22, ensuring a one-to-one correspondence between the ejector pins 54 and the discharge hole 221.

[0048] Reference Figure 4 、 Figure 5 The bracket 51 includes a mounting ring 511 and two extension blocks 512 arranged opposite to the mounting ring 511 . The extension blocks 512 are fixedly connected to the mounting ring 511 .

[0049] Reference Figure 3 、 Figure 4 The circumferential sidewall of the gun rod 21 is provided with a first external thread 213 and a second external thread 214 of identical structure, wherein the first external thread 213 is located on the outside of the boiler 1 and the second external thread 214 is located on the inside of the boiler 1. The mounting ring 511 is threadedly connected to the first external thread 213, allowing the bracket 51 to rotate relative to the gun rod 21, thereby causing the movable rod 52, base block 53, and ejector pin 54 to rotate relative to the gun rod 21, thereby reducing the impact of the cleaning mechanism 5 on the discharge of urea solution during operation of the denitrification system. To facilitate the rotation of the mounting ring 511, a rotating handle 513 is fixed to the circumferential sidewall of the mounting ring 511, which the operator can use to control the rotation of the mounting ring 511.

[0050] Reference Figure 3 、 Figure 4 A positioning ring 6 is threadedly connected to the second external thread 214. The positioning ring 6 is provided with two vertically extending positioning holes 61. The end of each movable rod 52 away from the bracket 51 is slidably disposed in an adjacent positioning hole 61. In addition, an abutment block 62 is slidably disposed in the positioning hole 61. The abutment block 62 is located between the movable rod 52 and the gun barrel 21. An abutment spring 63 is disposed between the abutment block 62 and the wall of the positioning hole 61 near the gun barrel 21. The abutment spring 63 is always in a compressed state, so that the abutment spring 63 has the force to drive the abutment block 62 to push the movable rod 52 away from the gun barrel 21. This prevents the movable rod 52 from moving toward the gun barrel 21 and causing the ejector pin 54 to block the discharge hole 221 in the event of a failure of the drive assembly 55.

[0051] Reference Figure 5 The drive assembly 55 includes a bidirectional screw 551 rotatably disposed between the two extension blocks 512, a driven gear 552 fixedly connected to the bidirectional screw 551, a driving gear 553 meshing with one side of the driven gear 552, and a servo motor 554 for driving the driving gear 553 to rotate circumferentially. The servo motor 554 is fixedly disposed on the mounting ring 511, and its output shaft is fixedly connected to the driving gear 553. The bidirectional screw 551 has two threaded sections with opposite thread directions. The two movable rods 52 are respectively threadedly connected to different threaded sections of the bidirectional screw 551. When the servo motor 554 is turned on, the driving gear 553 drives the driven gear 552 and the bidirectional screw 551 to rotate, causing the two movable rods 52 to move toward or away from each other, thereby causing each ejector pin 54 to move into or out of the adjacent discharge hole 221. It should be noted that in this embodiment, the driving gear 553 and the driven gear 552 are both bevel gears.

[0052] Reference Figure 6 To ensure that the movable rod 52 can move relative to the boiler 1, a clearance opening 121 is provided on the protective plate 12 for the movable rod 52 to slide. A stopper 56 is fixedly connected to the movable rod 52. The stopper 56 is located outside the boiler 1 and has a larger cross-sectional area than the clearance opening 121. When the stopper 56 moves to abut the protective plate 12, the clearance opening 121 is completely blocked, preventing smoke from escaping the boiler 1 through the clearance opening 121.

[0053] Reference Figure 3 、 Figure 6A retaining ring 215 and an abutting ring 216 are fixed to the circumferential sidewall of the gun barrel 21, located outside the boiler 1. The retaining ring 215 is located on the side of the first external thread 213 away from the boiler 1, and the abutting ring 216 is located between the first external thread 213 and the boiler 1. When the mounting ring 511 rotates to abut against the retaining ring 215, the movable rod 52 is aligned with the ejector pins 54 and the discharge hole 221. When the mounting ring 511 rotates to abut against the abutting ring 216, the movable rod 52 is misaligned with the ejector pins 54 and the discharge hole 221, and the stopper 56 abuts against the protective plate 12, blocking the clearance opening 121.

[0054] The implementation principle of an efficient denitrification system for an industrial solid waste furnace in an embodiment of the present application is as follows: when the denitrification system is working, the mounting ring 511 is in a state of abutting against the abutment ring 216, and each ejector pin 54 is misaligned with the discharge hole 221. The liquid injection mechanism 3 will input the prepared urea solution into the spray gun 2, and the gas injection mechanism 4 will input high-pressure air into the spray gun 2, so that the urea solution is atomized through the nozzle 22 and sprayed into the boiler 1 to reduce the nitrogen oxides in the flue gas into nitrogen and water.

[0055] After the nozzle 22 is clogged, the mounting ring 511 is first rotated to a state where it abuts the limiting ring 215, so that each ejector pin 54 is aligned with the discharge hole 221 respectively; then the driving assembly 55 is turned on, so that the two movable rods 52 drive the base block 53 connected thereto to move toward each other, and then each ejector pin 54 is respectively inserted into the corresponding discharge hole 221, so that the ejector pin 54 can be used to crush the impurities accumulated in the discharge hole 221, and the high-pressure gas in the spray gun 2 can be blown out to remove the crushed blockage, thereby achieving the dredging and cleaning of the discharge hole 221, thereby ensuring the output of urea solution and high denitrification efficiency of the spray gun 2 per unit time.

[0056] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An industrial solid waste furnace high-efficiency denitrification system, comprising a spray gun (2) mounted on a boiler (1), a liquid injection mechanism (3) for inputting urea solution into the spray gun (2), and an air injection mechanism (4) for inputting high-pressure air into the spray gun (2), wherein the spray gun (2) comprises a gun rod (21), a plurality of nozzles (22) spaced apart on both sides of the gun rod (21), the nozzles (22) being located inside the boiler (1), and a plurality of discharge holes (221) for outputting urea solution being opened on the nozzles (22), characterized in that: The spray gun (2) is provided with a cleaning mechanism (5) for clearing the discharge hole (221), the cleaning mechanism (5) comprising a bracket (51) mounted on the gun rod (21), two movable rods (52) slidably mounted on the bracket (51), a plurality of base blocks (53) connected to the movable rods (52), a plurality of ejectors (54) fixed on the base blocks (53) facing the gun rod (21), and a driving assembly (55) for driving the two movable rods (52) to move toward or away from each other, the number of the ejectors (54) being equal to and corresponding to the discharge holes (221), and each ejector (54) being able to move into or out of an adjacent discharge hole (221) under the action of the driving assembly (55); The circumferential side wall of the gun rod (21) is provided with a first external thread (213) located outside the boiler (1); the bracket (51) includes a mounting ring (511) threadedly connected to the first external thread (213); and a rotating handle (513) is fixed to the circumferential side wall of the mounting ring (511); The driving assembly (55) is located outside the boiler (1), and a second external thread (214) is provided on the circumferential side wall of the gun rod (21) at one end away from the mounting ring (511), and a positioning ring (6) is threadedly connected to the second external thread (214), and two vertically extending positioning holes (61) are provided on the positioning ring (6), and one end of each movable rod (52) away from the bracket (51) is slidably set in the adjacent positioning hole (61); A limiting ring (215) is fixed to the circumferential side wall of the gun rod (21), and the limiting ring (215) is located on the side of the first external thread (213) away from the boiler (1); when the mounting ring (511) abuts against the limiting ring (215), the movable rod (52) is in a state in which the ejector pin (54) is aligned with the discharge hole (221).

2. The high-efficiency denitrification system for industrial solid waste furnace according to claim 1, characterized in that: The driving assembly (55) comprises a bidirectional screw (551) rotatably arranged on a bracket (51), a driven gear (552) fixedly connected to the bidirectional screw (551), a driving gear (553) meshed with one side of the driven gear (552), and a servo motor (554) for driving the driving gear (553) to rotate circumferentially, wherein the servo motor (554) is mounted on the bracket (51), the bidirectional screw (551) has two threaded sections with opposite thread directions, and the two movable rods (52) are respectively threadedly connected to different threaded sections of the bidirectional screw (551).

3. The high-efficiency denitrification system for industrial solid waste furnace according to claim 1 is characterized in that: An abutment block (62) is slidably provided in the positioning hole (61), the abutment block (62) is located between the movable rod (52) and the gun rod (21), and an abutment spring (63) is provided between the abutment block (62) and the hole wall of the positioning hole (61), the abutment spring (63) is used to drive the abutment block (62) to push the movable rod (52) toward a side away from the gun rod (21).

4. The high-efficiency denitrification system for industrial solid waste furnace according to claim 1 is characterized in that: The side wall of the boiler (1) is provided with a clearance opening (121) for the movable rod (52) to slide, and a stopper (56) located outside the boiler (1) is fixedly connected to the movable rod (52), the cross-sectional area of the stopper (56) is larger than the cross-sectional area of the clearance opening (121), and the stopper (56) can block the clearance opening (121) when it moves to abut against the boiler (1).

5. The high-efficiency denitrification system for industrial solid waste furnace according to claim 1 is characterized in that: The gun rod (21) is fixed with extension tubes (211) having the same number as the nozzles (22), and the nozzles (22) are detachably connected to the extension tubes (211).

6. The high-efficiency denitrification system for industrial solid waste furnace according to claim 5, characterized in that: A connecting stud (531) is fixed on one side of the base block (53) facing the movable rod (52), and a connecting screw hole (521) threadedly matched with the connecting stud (531) is provided on the movable rod (52).

7. The high-efficiency denitrification system for industrial solid waste furnace according to claim 6, characterized in that: The boiler (1) comprises a furnace body (11) and a protective plate (12) detachably arranged on the furnace body (11), and each of the spray guns (2) is mounted on the protective plate (12).

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