Safe ignition device of ammonia oxidation furnace

Abstract

The invention discloses an ammonia oxidation furnace safety ignition device which comprises a sparking plug, a steel pipe is sleeved outside the sparking plug, a small hydrogen pipe is arranged on the steel pipe along the length direction of the steel pipe, a first protective cap is fixedly sleeved on the steel pipe, and a second protective cap is rotatably sleeved outside the first protective cap. A first window and a second window are formed in the first protective cap and the second protective cap respectively, the range of the second window is smaller than that of the first window, a driven gear ring is fixed to the outer side of the second protective cap, a half gear ring is fixed to the small hydrogen pipe and meshed with the driven gear ring, and a driving gear is arranged on the driven gear ring in a meshed transmission mode. A gas outlet of the small hydrogen pipe is located at an electrode of the spark plug, and after successful ignition, the driving gear drives the second protective cap to rotate clockwise and the small hydrogen pipe to rotate anticlockwise until a closed space is formed between the first protective cap and the metal flange and between the second protective cap and the metal flange. The problem that in the prior art, ignition performance is reduced due to the fact that carbon deposition of a spark plug cannot be treated in time is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical equipment, and in particular relates to a safe ignition device for an ammonia oxidation furnace. Background Art

[0002] The ammonia oxidation furnace is a device used to catalyze the reaction of ammonia and oxygen in the air to generate nitrogen oxides. When working, the small hydrogen tube is first ignited by an ignition device such as a spark plug, and then the large hydrogen tube is ignited by the small hydrogen tube with flame.

[0003] The working environment of the ammonia oxidation furnace may contain pollutants such as dust and impurities, which will adhere to the spark plug and affect its performance. For example, dust may block the gap of the spark plug and make ignition difficult.

[0004] The imbalance of the fuel and air mixture in the ammonia oxidation furnace may lead to incomplete combustion, and the unburned fuel will form carbon deposits on the spark plug electrode. When the ammonia oxidation furnace is running at low load, the combustion temperature is relatively low, which can easily cause incomplete combustion of the fuel, thereby increasing the formation of carbon deposits. Due to the above factors, as the use time increases, the performance of the spark plug will gradually decline, making it impossible for the ignition device to ignite smoothly and safely. Summary of the invention

[0005] The purpose of the present invention is to solve the problem in the prior art that the ignition performance of the spark plug is reduced and affects the ignition after long-term use, and to propose a safe ignition device for an ammonia oxidation furnace.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a safe ignition device for an ammonia oxidation furnace, comprising a spark plug, a connecting portion of the spark plug is threadedly connected to an ignition connecting rod, a first insulating tube is sleeved on the outer surface of the ignition connecting rod, a second insulating tube is sleeved on the outer surface of the spark plug and the ignition connecting rod, a steel pipe is sleeved on the outer surface of the second insulating tube, a metal flange is arranged at one end of the spark plug for ignition, the metal flange is welded and sealed to the steel pipe, the outer diameters of the metal flange and the steel pipe are equal, one end of the second insulating tube is sealed and connected to the end face of the metal flange, and the ignition electrode of the spark plug is located outside the metal flange; a small hydrogen tube is arranged on the steel pipe along its length direction, the small hydrogen tube consists of a connecting tube and a rotating tube, the rotating tube is rotatably sleeved on the end of the connecting tube, a first protective cap is fixedly sleeved on the flange, and a second protective cap is rotatably sleeved on the outer side of the first protective cap, The rotating shaft of the second protective cap is coaxial with the steel pipe, a first window is provided on the first protective cap, and a second window is provided on the second protective cap, the range of the second window is smaller than the range of the first window, a driven gear ring is fixed on the outer side of the second protective cap, a half gear ring is fixed on the rotating tube, the half gear ring is meshed with the driven gear ring, a driving gear is provided on the meshing transmission of the driven gear ring, the driving gear is connected to the driving motor through the driving shaft, during ignition, the air outlet of the rotating tube is located at the electrode of the spark plug, after successful ignition, the driving shaft rotates to drive the driving gear to rotate, the driving gear drives the second protective cap to rotate clockwise, and the rotating tube rotates counterclockwise until the first window and the second window are completely blocked and a closed space is formed between the first protective cap and the second protective cap and the metal flange, and the rotating tube rotates to be away from the ignition electrode of the spark plug;

[0007] The steel pipe, the driving shaft and the connecting pipe are all passed through the furnace body of the ammonia oxidation furnace. The driving motor is arranged on the furnace body of the ammonia oxidation furnace. An insulating flange is arranged at the end of the steel pipe away from the spark plug. A stainless steel or graphite gasket is arranged in the insulating flange. The first insulating tube and the second insulating tube extend to the stainless steel or graphite gasket. The length of the ignition connecting rod extends to the ignition box arranged outside the insulating flange.

[0008] As a further description of the above technical solution: a protective cover is arranged on the steel pipe, and the protective cover is composed of a fixing ring, a sealing end cover and a shell. The fixing ring is fixed on the steel pipe, and the sealing end cover is sleeved on the second protective cap. One end of the shell is connected to the sealing end cover and the other end is connected to the fixing ring. The sealing end cover, the shell and the second protective cap form an annular cavity. The driven gear ring, the half gear ring and the driving gear are located in the annular cavity. The connecting pipe and the driving shaft are both passed through the shell, and the rotating pipe is passed through the sealing end cover.

[0009] As a further description of the above technical solution: the first protective cap and the second protective cap have the same structure, including a connecting ring, an end panel and a side ring, the side ring is used to connect the connecting ring and the end panel, the first window is opened on the side panel of the first protective cap, and the second window is opened on the side panel of the second protective cap.

[0010] As a further description of the above technical solution: a cleaning cylinder is arranged in the first protective cap, and a transmission assembly is arranged between the cleaning cylinder and the end panel of the first protective cap. When the second protective cap rotates, the cleaning cylinder is driven by the transmission assembly to move toward or away from the spark plug and rotate around the ignition electrode of the spark plug.

[0011] As a further description of the above technical solution: the outer side of the cleaning barrel is provided with fine sandpaper or a wire brush.

[0012] As a further description of the above technical solution: the transmission assembly includes an inner gear ring fixed on the end panel of the first protective cap, the inner gear ring is coaxial with the steel pipe, a driving gear is rotatably arranged in the inner gear ring, the driving gear is coaxial with the inner gear ring, a planetary gear is arranged between the driving gear and the inner gear ring, the planetary gear is meshed with the driving gear and the inner gear ring, a rotating shaft is coaxially arranged on the end panel of the second protective cap, the rotating shaft is passed through the end panel of the first protective cap, the rotating shaft is coaxially fixed with the driving gear, a connecting plate is sleeved on the rotating shaft, the connecting plate is located between the driving gear and the end panel of the first protective cap, a fixed shaft is arranged on the connecting plate, the planetary gear is rotatably arranged on the fixed shaft, the cleaning cylinder is coaxially sleeved on the fixed shaft, a telescopic transmission mechanism is arranged between the inside of the cleaning cylinder and the planetary gear, and when the planetary gear rotates, the cleaning cylinder moves toward or away from the metal flange under the action of the telescopic transmission mechanism.

[0013] As a further description of the above technical solution: the telescopic transmission mechanism includes a limit rod and a guide column, the limit rod is fixed on the end face of the planetary gear, the limit rod is parallel to the fixed shaft, the end face of the cleaning cylinder facing the planetary gear is provided with a sliding plate, the limit rod is penetrated through the sliding plate, the guide column is coaxially fixed on the fixed shaft, the guide column is adapted to the cleaning cylinder, a spiral track groove and an annular groove are provided on the outer side of the guide column, the annular groove is provided on the side away from the planetary gear, the end of the spiral track groove close to the planetary gear is the proximal end, and the end away from the spiral track groove is the distal end, the distal end of the spiral track groove is connected with the annular groove, the groove depth of the annular groove gradually decreases from its starting position to its ending position, the starting position of the annular groove is the distal end of the spiral track groove, and the contact position with the distal end of the spiral track groove after circling the guide column is the ending position; a telescopic head adapted to the spiral track groove and the annular groove is provided on the cleaning cylinder.

[0014] As a further description of the above technical solution: a protective cover is arranged inside the first protective cap, the protective cover is rotatably arranged on the inner gear ring, and a mounting hole for the fixed shaft to pass through is opened on the protective cover.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0016] (1) The spark plug ignition electrode of the present application is completely located inside the first protective cap and the second protective cap when not ignited, and the first window and the second window are in a shielded and closed state, so that the unburned fuel in the ammonia oxidation furnace cannot directly contact the ignition electrode of the spark plug during combustion, and carbon deposits will not form on it, thereby protecting the spark plug, extending its service life, and improving the ignition efficiency.

[0017] (2) During the ignition process, when the second protective cap rotates around the first protective cap, the cleaning cylinder brushes the surface of the spark plug under the action of the transmission assembly. In this process, the spark plug rotates around the ignition electrode of the spark plug to clean the carbon deposits generated by the ignition electrode at the moment of ignition. The carbon deposits removed by the cleaning brush fall directly into the protective cap. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the assembly relationship between the present invention and the ammonia oxidation furnace;

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 3 is a cross-sectional view of the present invention;

[0021] Figure 4 It is another state structure schematic diagram of the present invention;

[0022] Figure 5 It is a three-dimensional structural schematic diagram of the present invention, hiding the protective cover;

[0023] Figure 6 An exploded view of the assembly relationship between the first protective cap and the second protective cap of the present invention;

[0024] Figure 7 A cross-sectional view of the first protective cap and the second protective cap of the present invention in an assembled state;

[0025] Figure 8 It is a schematic diagram of the transmission assembly structure of the present invention;

[0026] Fig. 9 It is a schematic diagram of another angle transmission assembly structure of the present invention;

[0027] Fig.10 It is a schematic diagram of the side expansion of the guide column of the present invention.

[0028] Legend: 1. Ammonia oxidation furnace; 2. Spark plug; 3. Ignition connecting rod; 4. First insulating tube; 5. Second insulating tube; 6. Steel tube; 7. Metal flange; 8. Small hydrogen tube; 9. Connecting tube; 10. Rotating tube; 11. Ignition box; 12. First protective cap; 13. Second protective cap; 14. First window; 15. Second window; 16. Connecting ring; 17. End plate; 18. Side ring; 19. Driven gear ring; 20. Half gear ring; 21. Drive Gear; 22, driving shaft; 23, driving motor; 24, protective cover; 25, fixing ring; 26, sealing end cover; 27, housing; 28, cleaning cylinder; 29, inner ring; 30, driving gear; 31, planetary gear; 32, rotating shaft; 33, connecting plate; 34, fixed shaft; 35, limiting rod; 36, guide column; 37, protective cover; 38, mounting hole; 39, sliding plate; 40, spiral track groove; 41, annular groove; 42, telescopic head. DETAILED DESCRIPTION

[0029] 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.

[0030] See also Figure 1-10 The present invention provides a technical solution for a safe ignition device for an ammonia oxidation furnace:

[0031] A safe ignition device for an ammonia oxidation furnace is arranged on the furnace body of the ammonia oxidation furnace 1, comprising a spark plug 2, a connecting portion of the spark plug 2 is threadedly connected to an ignition connecting rod 3, the ignition connecting rod 3 is sheathed with a first insulating tube 4, the spark plug 2 and the ignition connecting rod 3 are sheathed with a second insulating tube 5, the second insulating tube 5 is sheathed with a steel tube 6, an ignition end of the spark plug 2 is provided with a metal flange 7, the metal flange 7 is welded and sealed with the steel tube 6, the outer diameter of the metal flange 7 is equal to that of the steel tube 6, one end of the second insulating tube 5 is sealed and connected to the end face of the metal flange 7, the ignition electrode of the spark plug 2 is located at a metal flange 7, and the metal flange 7 is welded and sealed with the steel tube 6. The outer diameter of the metal flange 7 is equal to that of the steel tube 6. The metal flange 7 is welded and sealed with the outer diameter of the metal flange 7 ... metal flange 7. The metal flange 7 is welded and sealed with the outer diameter of the metal flange 7. The metal flange 7 is welded and sealed with the outer diameter of the metal flange 7. The metal flange 7 is welded and sealed with the outer diameter of the metal flange The flange 7 is outside the steel pipe 6; a small hydrogen tube 8 is arranged on the steel pipe 6 along its length direction, and the small hydrogen tube 8 is composed of a connecting tube 9 and a rotating tube 10. The rotating tube 10 is rotatably sleeved on the end of the connecting tube 9. The steel pipe 6 and the connecting tube 9 are both penetrated into the furnace body of the ammonia oxidation furnace 1, and are sealed at the penetration and fixing position. An insulating flange is arranged at one end of the steel pipe 6 away from the spark plug 2, and a stainless steel or graphite gasket is arranged in the insulating flange. The first insulating tube 4 and the second insulating tube 5 extend to the stainless steel or graphite gasket, and the length of the ignition connecting rod 3 extends to the ignition box 11 arranged outside the insulating flange.

[0032] A first protective cap 12 is fixedly sleeved on the flange, a second protective cap 13 is rotatably sleeved on the outer side of the first protective cap 12, a rotating shaft 32 of the second protective cap 13 is coaxial with the steel pipe 6, a first window 14 is opened on the first protective cap 12, and the first window 14 is set upward, a second window 15 is opened on the second protective cap 13, and the range of the second window 15 is smaller than the range of the first window 14, the first protective cap 12 and the second protective cap 13 have the same structure, including a connecting ring 16, an end panel 17 and a side ring 18, the side ring 18 is used to connect the connecting ring 16 and the end panel 17, the first window 14 is opened on the side panel of the first protective cap 12, and the second window 15 is opened on the side panel of the second protective cap 13.

[0033] A driven gear ring 19 is fixed to the outside of the second protective cap 13, a half gear ring 20 is fixed to the rotating tube 10, the half gear ring 20 is meshed with the driven gear ring 19, a reset torsion spring (not shown in the figure) is arranged between the rotating tube 10 and the connecting tube 9, a driving gear 21 is arranged on the driven gear ring 19 for meshing transmission, the driving gear 21 is connected to the driving motor 23 through the driving shaft 22, the driving shaft 22 is parallel to the steel pipe 6 and is penetrated on the furnace body of the ammonia oxidation furnace 1, and the driving motor 23 is arranged on the furnace body of the ammonia oxidation furnace 1.

[0034] A protective cover 24 is provided on the steel pipe 6, and the protective cover 24 consists of a fixing ring 25, a sealing end cover 26 and a shell 27. The fixing ring 25 is fixed on the steel pipe 6, and the sealing end cover 26 is sleeved on the second protective cap 13. One end of the shell 27 is connected to the sealing end cover 26 and the other end is connected to the fixing ring 25. The sealing end cover 26, the shell 27 and the second protective cap 13 form an annular cavity. The driven ring gear 19, the half ring gear 20 and the driving gear 21 are located in the annular cavity. The connecting pipe 9 and the driving shaft 22 are both passed through the shell 27, and the rotating pipe 10 is passed through the sealing end cover 26.

[0035] Before ignition, a sealed space is formed between the first protective cap 12, the second protective cap 13 and the metal flange 7, and the ignition electrode of the spark plug 2 is located in the closed space. At this time, the second window 15 of the second protective cap 13 faces downward, while the first window 14 of the first protective cap 12 faces upward, and the two are completely misaligned, thus forming a sealed space.

[0036] A cleaning barrel 28 is provided inside the first protective cap 12, and a fine sandpaper or a wire brush is sleeved on the outside of the cleaning barrel. In this embodiment, a fine sandpaper is sleeved on the outside of the cleaning barrel 28. A transmission assembly is provided between the cleaning barrel 28 and the end panel 17 of the first protective cap 12. When the second protective cap 13 rotates, the cleaning barrel 28 is driven by the transmission assembly to move toward or away from the spark plug 2 and rotate around the ignition electrode of the spark plug 2.

[0037] The transmission assembly includes an inner gear ring 29 fixed on the end panel 17 of the first protective cap 12, the inner gear ring 29 is coaxial with the steel pipe 6, a driving gear 30 is rotatably arranged in the inner gear ring 29, the driving gear 30 is coaxial with the inner gear ring 29, a planetary gear 31 is arranged between the driving gear 30 and the inner gear ring 29, the planetary gear 31 is meshed with both the driving gear 30 and the inner gear ring 29, a rotating shaft 32 is coaxially arranged on the end panel 17 of the second protective cap 13, the rotating shaft 32 is penetrated through the end panel 17 of the first protective cap 12, and the rotating shaft 32 is rotated with the inner gear ring 29. The driving gear 30 is coaxially fixed, and a connecting plate 33 is sleeved on the rotating shaft 32. The connecting plate 33 is located between the driving gear 30 and the end panel 17 of the first protective cap 12. A fixed shaft 34 is arranged on the connecting plate 33. The planetary gear 31 is rotatably arranged on the fixed shaft 34. The cleaning cylinder 28 is coaxially sleeved on the fixed shaft 34. A telescopic transmission mechanism is arranged between the inside of the cleaning cylinder 28 and the planetary gear 31. The telescopic transmission mechanism includes a limit rod 35 and a guide column 36. The limit rod 35 is fixed to the end face of the planetary gear 31. The limit rod 35 is parallel to the fixed shaft 34, a protective cover 37 is arranged in the first protective cap 12, the protective cover 37 is rotatably arranged on the inner gear ring 29, a mounting hole 38 for the fixed shaft 34 to pass through is opened on the protective cover 37, a sliding plate 39 is arranged on the end surface of the cleaning cylinder 28 facing the planetary gear 31, the limit rod 35 is penetrated on the sliding plate 39, a guide column 36 is coaxially fixed on the fixed shaft 34, the guide column 36 is adapted to the cleaning cylinder 28, and a spiral track groove 40 and an annular groove 41 are arranged on the outer side of the guide column 36, and the annular groove 41 is arranged away from On one side of the planetary gear 31, the end of the spiral trajectory groove 40 close to the planetary gear 31 is the proximal end, and the end away from the spiral trajectory groove 40 is the distal end. The distal end of the spiral trajectory groove 40 is connected with the annular groove 41, and the groove depth of the annular groove 41 gradually decreases from its starting position to its ending position. The starting position of the annular groove 41 is the distal end of the spiral trajectory groove 40, and the contact position with the distal end of the spiral trajectory groove 40 after one circle around the fixed shaft 34 is the ending position; a telescopic head 42 adapted to the spiral trajectory groove 40 and the annular groove 41 is provided on the cleaning cylinder 28.

[0038] Working principle: Before ignition, the first protective cap 12 and the second protective cap 13 form a closed space, and the gas outlet of the rotating tube 10 is located away from the ignition electrode of the spark plug 2, such as Figure 4 At this moment, the cleaning tube contacts the electrode of the spark plug 2, and the telescopic head 42 is located in the annular groove 41.

[0039] During ignition, the driving motor 23 is started first, and the driving shaft 22 drives the driving gear 21 to rotate so that the driven gear and the second protective cap 13 rotate clockwise at the same time. Under the drive of the driven gear, the half gear ring 20 and the rotating tube 10 rotate counterclockwise at the same time until the first window 14 and the second window 15 overlap and the air outlet of the rotating tube 10 faces the ignition electrode of the spark plug 2. It should be noted that in the above process, due to the relationship of the transmission ratio, the rotating tube 10 and the half gear ring 20 rotate half a circle when the driven gear ring 19 rotates a small angle. During the process of the driven gear ring 19 continuing to rotate to half a circle, it no longer meshes with the half gear ring 20, but when the driven gear ring 19 rotates counterclockwise, the half gear ring 20 can immediately mesh with the driven gear ring 19 under the action of the torsion spring. In the above process, it is designed that there is no interference between the air outlet of the rotating tube 10 and the second protective cap 13 during rotation.

[0040] In the above process, the second protective cap 13 rotates to drive the driving gear 30 to rotate, so that the planetary gear 31 rotates clockwise around the inner gear ring 29 while rotating on its own. In this process, the annular groove 41 of the telescopic head 42 enters the spiral track groove 40, so that the cleaning cylinder 28 moves toward the planetary gear 31 until it is no longer in contact with the ignition electrode of the spark plug 2. In the above process, the fine sandpaper on the cleaning cylinder 28 cleans the ignition electrode of the spark plug 2 and removes the carbon deposits on the spark plug 2.

[0041] Then, hydrogen is passed through the small hydrogen tube 8 and then the spark plug 2 is powered on to ignite, and after the small hydrogen tube 8 is ignited, the driving motor 23 rotates in the opposite direction, so that the above structure returns to the state before ignition. During this process, the cleaning cylinder 28 cleans the ignition electrode of the spark plug 2 again, while the small hydrogen tube 8 is still in the ignition state. After the outlet of the rotating tube 10 away from the ignition electrode position of the spark plug 2 ignites the large hydrogen tube of the ammonia oxidation furnace 1, the small hydrogen tube 8 is disconnected from the hydrogen.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Within the technical scope disclosed by the present invention, technicians familiar with the technical field can make equivalent replacements or changes based on the technical scheme and inventive concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A safe ignition device for an ammonia oxidation furnace, characterized in that The invention comprises a spark plug (2), wherein the connecting portion of the spark plug (2) is threadedly connected to an ignition connecting rod (3), a first insulating tube (4) is sheathed on the outer surface of the ignition connecting rod (3), a second insulating tube (5) is sheathed on the outer surface of the spark plug (2) and the ignition connecting rod (3), a steel pipe (6) is sheathed on the outer surface of the second insulating tube (5), a metal flange (7) is arranged on the ignition end of the spark plug (2), the metal flange (7) and the steel pipe (6) are welded and sealed, the outer diameters of the metal flange (7) and the steel pipe (6) are equal, one end of the second insulating tube (5) is sealedly connected to the end face of the metal flange (7), and the ignition electrode of the spark plug (2) is located outside the metal flange (7); the steel pipe (6) is provided with a small hydrogen tube (8) along its length direction, the small hydrogen tube (8) is composed of a connecting tube (9) and a rotating tube (10), the rotating tube (10) is rotatably sleeved on the end of the connecting tube (9), a first protective cap (12) is fixedly sleeved on the flange, a second protective cap (13) is rotatably sleeved outside the first protective cap (12), the rotating shaft (32) of the second protective cap (13) is coaxial with the steel pipe (6), a first window (14) is opened on the first protective cap (12), a second window (15) is opened on the second protective cap (13), the range of the second window (15) is smaller than the range of the first window (14), A driven gear ring (19) is fixed on the outside of the second protective cap (13), a half gear ring (20) is fixed on the rotating tube (10), the half gear ring (20) meshes with the driven gear ring (19), a driving gear (21) is provided on the driven gear ring (19) for meshing transmission, the driving gear (21) is connected to the driving motor (23) via a driving shaft (22), during ignition, the air outlet of the rotating tube (10) is located at the electrode of the spark plug (2), after ignition is successful, the driving shaft (22) rotates to drive the driving gear (21) to rotate, the driving gear (21) drives the second protective cap (13) to rotate clockwise, and the rotating tube (10) rotates counterclockwise The rotating tube (10) is rotated until the first window (14) and the second window (15) are completely blocked and a closed space is formed between the first protective cap (12) and the second protective cap (13) and the metal flange (7), and the rotating tube (10) is rotated to an ignition electrode away from the spark plug (2); the steel tube (6), the drive shaft (22) and the connecting tube (9) are all inserted into the furnace body of the ammonia oxidation furnace (1), the drive motor (23) is arranged on the furnace body of the ammonia oxidation furnace (1), the first insulating tube (4) and the second insulating tube (5) extend to the stainless steel or graphite gasket, and the length of the ignition connecting rod (3) extends to the ignition box (11) arranged outside the insulating flange.

2. The safe ignition device for an ammonia oxidation furnace according to claim 1, characterized in that: The steel pipe (6) is provided with a protective cover (24), which is composed of a fixing ring (25), a sealing end cover (26) and a shell (27). The fixing ring (25) is fixed on the steel pipe (6), the sealing end cover (26) is sleeved on the second protective cap (13), one end of the shell (27) is connected to the sealing end cover (26) and the other end is connected to the fixing ring (25), the sealing end cover (26), the shell (27) and the second protective cap (13) form an annular cavity, the driven gear ring (19), the half gear ring (20) and the driving gear (21) are located in the annular cavity, the connecting pipe (9) and the driving shaft (22) are both passed through the shell (27), and the rotating pipe (10) is passed through the sealing end cover (26).

3. The safe ignition device for an ammonia oxidation furnace according to claim 1, characterized in that: The first protective cap (12) and the second protective cap (13) have the same structure, including a connecting ring (16), an end panel (17) and a side ring (18), wherein the side ring (18) is used to connect the connecting ring (16) and the end panel (17), the first window (14) is provided on the side panel of the first protective cap (12), and the second window (15) is provided on the side panel of the second protective cap (13).

4. The safe ignition device for an ammonia oxidation furnace according to claim 3, characterized in that: A cleaning cylinder (28) is arranged inside the first protective cap (12), and a transmission assembly is arranged between the cleaning cylinder (28) and the end panel (17) of the first protective cap (12). When the second protective cap (13) rotates, the cleaning cylinder (28) is driven by the transmission assembly to move toward or away from the spark plug (2) and rotate around the ignition electrode of the spark plug (2).

5. The safe ignition device for an ammonia oxidation furnace according to claim 4, characterized in that: The outer side of the cleaning barrel is sleeved with fine sandpaper or a wire brush.

6. The safe ignition device for an ammonia oxidation furnace according to claim 4, characterized in that: The transmission assembly comprises an inner gear ring (29) fixed on the end panel (17) of the first protective cap (12), the inner gear ring (29) being coaxial with the steel pipe (6), a driving gear (30) being rotatably arranged in the inner gear ring (29), the driving gear (30) being coaxial with the inner gear ring (29), a planetary gear (31) being arranged between the driving gear (30) and the inner gear ring (29), the planetary gear (31) being meshed with both the driving gear (30) and the inner gear ring (29), a rotating shaft (32) being coaxially arranged on the end panel (17) of the second protective cap (13), the rotating shaft (32) being passed through the end panel (17) of the first protective cap (12), and the rotating shaft (32) being arranged to rotate. The shaft (32) is coaxially fixed with the driving gear (30), a connecting plate (33) is sleeved on the rotating shaft (32), the connecting plate (33) is located between the driving gear (30) and the end plate (17) of the first protective cap (12), a fixed shaft (34) is arranged on the connecting plate (33), the planetary gear (31) is rotatably arranged on the fixed shaft (34), the cleaning cylinder (28) is coaxially sleeved on the fixed shaft (34), a telescopic transmission mechanism is arranged between the inside of the cleaning cylinder (28) and the gear of the planetary gear (31), and when the planetary gear (31) rotates, the cleaning cylinder (28) moves toward or away from the metal flange (7) under the action of the telescopic transmission mechanism.

7. The safe ignition device for an ammonia oxidation furnace according to claim 6, characterized in that: The telescopic transmission mechanism comprises a limit rod (35) and a guide column (36), wherein the limit rod (35) is fixed to the end face of the planetary gear (31), the limit rod (35) is parallel to the fixed shaft (34), a sliding plate (39) is arranged on the end face of the cleaning cylinder (28) facing the planetary gear (31), the limit rod (35) is passed through the sliding plate (39), the guide column (36) is coaxially fixed to the fixed shaft (34), the guide column (36) is adapted to the cleaning cylinder (28), and a spiral track groove (40) and an annular groove (41) are arranged on the outer side of the guide column (36), and the annular groove (41) is arranged at the far end. On the side away from the planetary gear (31), the end of the spiral track groove (40) close to the planetary gear (31) is the proximal end, and the end away from the spiral track groove (40) is the distal end. The distal end of the spiral track groove (40) is connected with the annular groove (41). The groove depth of the annular groove (41) gradually decreases from its starting position to its ending position. The starting position of the annular groove (41) is the distal end of the spiral track groove (40), and the contact position with the distal end of the spiral track groove (40) after one circle around the fixed shaft (34) is the ending position. The cleaning cylinder (28) is provided with a telescopic head (42) adapted to the spiral track groove (40) and the annular groove (41).

8. The safe ignition device for an ammonia oxidation furnace according to claim 7, characterized in that: A protective cover (37) is arranged inside the first protective cap (12), and the protective cover (37) is rotatably arranged on the inner gear ring (29). A mounting hole (38) for the fixed shaft (34) to pass through is opened on the protective cover (37).

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