A urea thermal decomposer

Abstract

The present application discloses a urea thermal decomposer, which belongs to the technical field of urea pyrolysis, and comprises a main body module and a spraying pyrolysis module. The main body module comprises a pyrolysis box, an upper portion of an outer surface of the pyrolysis box is fixedly connected with an exhaust pipe, a lower portion of an outer surface of the pyrolysis box is fixedly connected with a discharge pipe, a heating component is arranged outside the pyrolysis box, a mixing box is fixedly connected with the top of the pyrolysis box, and a support rod is fixedly connected with the bottom of the pyrolysis box. Through the arrangement of the heating component, the center rod, the spray component, the wall scraping component, the inner wave ring and the driving component, the spray component can perform rotational spraying, and the spray component will be driven by the inner wave ring to move when rotating, so that the spray component can spray the solvent more comprehensively, so that the solvent and the hot air are in more comprehensive contact, the pyrolysis effect is improved, and at the same time, the waste of hot air is avoided, and the utilization rate of hot air is improved.

Description

Technical Field

[0001] The present application relates to the technical field of urea thermal decomposition, and more specifically, to a urea thermal decomposer. Background Art

[0002] Urea, also known as carbamide, has a chemical formula of CH4N2O or CO(NH2)2[4]. It is an organic compound composed of carbon, nitrogen, oxygen and hydrogen and is a white crystal. It is one of the simplest organic compounds. Urea thermal decomposition is the most common method in the current SCR and SNCR denitrification processes. At present, in order to facilitate the thermal decomposition of urea, corresponding equipment is usually used to thermally decompose urea, among which the most common is the urea thermal decomposition furnace.

[0003] According to the search, the Chinese patent with patent number CN218755052U discloses a urea pyrolysis furnace, including a base, a pyrolysis chamber and a mixing chamber arranged from bottom to top, an exhaust pipe, a hot air inlet and a discharge pipe are arranged on the pyrolysis chamber, a motor is arranged at the upper end of the mixing chamber, a rotating rod is connected to the lower end of the output shaft of the motor, a scraper is connected to the rotating rod in the pyrolysis chamber through a support rod, the rotating rod located between the upper end of the pyrolysis chamber and the lower end of the mixing chamber is hollow, a liquid inlet is provided at the upper end of the hollow inner cavity of the rotating rod, a spray head is connected to the lower end of the hollow inner cavity of the rotating rod, and a control valve is arranged on the rotating rod between the pyrolysis chamber and the mixing chamber; the scraper connected to the rotating rod of the urea pyrolysis furnace not only realizes the cleaning of the crystallized material on the inner wall of the pyrolysis chamber, but also the spray head rotates with the rotating rod, so that the urea solution can be evenly sprinkled in the pyrolysis chamber in a circumferential direction to fully contact with the hot air, which can effectively improve the pyrolysis effect of the urea solution.

[0004] With respect to the above-mentioned related technologies, the applicant believes that when the above-mentioned type of thermal decomposition furnace is in use, the urea solution is sprayed by a rotating spray head, so as to achieve contact between urea and hot air. However, the above-mentioned method still makes it difficult for the sprayed urea solution to achieve sufficient contact with the hot air. The urea spraying method of the urea decomposer in the prior art is usually to install multiple nozzles horizontally in a straight line and at equal distances, and diffusely spray the urea solution through multiple nozzles, so as to allow hot air to contact with urea. However, there is a certain distance between the installation of multiple nozzles, and there are gaps at the positions where the nozzles are not installed inside the device, which makes it difficult for the sprayed urea to achieve uniform and comprehensive contact with the hot air inside the decomposition furnace, resulting in waste of hot air, thereby affecting the overall pyrolysis effect. Utility Model Content

[0005] In order to solve the above problems, the present application provides a urea thermal decomposer, which adopts the following technical solution:

[0006] A urea thermal decomposer comprises a main body module and a spraying pyrolysis module, wherein the main body module comprises a pyrolysis box, an exhaust pipe is fixedly connected to the upper part of the outer surface of the pyrolysis box, a discharge pipe is fixedly connected to the lower part of the outer surface of the pyrolysis box, a heating component is arranged outside the pyrolysis box, a mixing box is fixedly connected to the top of the pyrolysis box, a support rod is fixedly connected to the bottom of the pyrolysis box, a support plate is fixedly connected to the outer surface of the support rod, and the spraying pyrolysis module comprises a center rod rotatably connected between the pyrolysis box and the inside of the mixing box, the top end of the center rod is rotatably connected to the top of the inner wall of the mixing box, and the The outer surface of the center rod is arranged with eight spraying assemblies in a circular shape at equal distances, a scraping wall assembly is arranged between the inner wall of the pyrolysis box and the outer surface of the center rod, an inner wave ring is rotatably connected to the top of the inner wall of the pyrolysis box, and the inner wave ring is connected to the scraping wall assembly, a driving assembly connected to the center rod and the scraping wall assembly is arranged on the top of the support plate, a mixing assembly is arranged between the outer surface of the center rod and the inside of the mixing box, a delivery pump located inside the mixing box is fixedly installed on the outer surface of the center rod, a filter is fixedly connected to the input end of the delivery pump, and the eight spraying assemblies are all connected to the inner wave ring.

[0007] Furthermore, the spray assembly includes a movable bar fixedly connected to the outer surface of the center rod, a spray pipe is slidably connected to the inside of the movable bar, a plurality of nozzles are fixedly connected to the outer surface of the spray pipe in a straight line and at equal distances, one end of the spray pipe is fixedly connected to a telescopic tube, the telescopic tube is fixedly connected to the outer surface of the center rod, and a spring is fixedly connected between one end of the spray pipe and one end of the inner wall of the movable bar.

[0008] By adopting the above technical solution, the spraying pipe can be moved to facilitate movable spraying.

[0009] Furthermore, the spray assembly also includes an L-shaped rod fixedly connected to the top of the spray pipe, one end of the L-shaped rod is movably connected to a ball, and the outer surface of the ball is in contact with the inner wall of the inner wave ring.

[0010] By adopting the technical solution, the spraying pipe can spray according to the waves of the inner wave ring.

[0011] Furthermore, the wall scraping assembly includes a movable cylinder rotatably mounted on the outer surface of the center rod, the outer surface of the movable cylinder is rotatably connected to the bottom of the inner wall of the pyrolysis box, the outer surface of the movable cylinder is fixedly connected to two wall scraping rods, the outer surfaces of the scraping rods are in contact with the inner wall of the pyrolysis box, one end of the two scraping rods are fixedly connected to the inner wave ring, and the outer surfaces of the two scraping rods are fixedly connected to two cleaning brushes.

[0012] By adopting the above technical solution, the crystals on the inner wall of the pyrolysis box can be scraped off and the inner wave ring can be driven to rotate.

[0013] Furthermore, the driving assembly includes a driving motor fixedly connected to the top of the supporting plate, the output shaft of the driving motor and the bottom end of the movable cylinder are fixedly connected with connecting gears, the outer surfaces of the two connecting gears are meshed with each other, the bottom end of the center rod is fixedly connected with a large transmission roller, the output shaft of the driving motor is fixedly connected with a small transmission roller, and a transmission belt is connected between the outer surfaces of the small transmission roller and the large transmission roller.

[0014] By adopting the above technical solution, the central rod and the movable cylinder can be driven to rotate at different speeds at the same time.

[0015] Furthermore, the heating assembly includes an annular heating pipe arranged outside the pyrolysis box, a plurality of connecting pipes are fixedly connected between the inner wall of the annular heating pipe and the outer surface of the pyrolysis box, and an air intake pipe is fixedly connected to the outer surface of the annular heating pipe.

[0016] By adopting the above technical solution, the warm air can be delivered to the inside of the pyrolysis box more evenly.

[0017] Furthermore, the mixing assembly includes a cross plate fixedly connected to the outer surface of the central rod and located inside the mixing box, the interior of the cross plate is rotatably connected to four mixing rods, and the top ends of the four mixing rods are fixedly connected to self-rotating gears.

[0018] By adopting the above technical solution, water and urea are mixed through the mixing rod.

[0019] Furthermore, an inner gear ring is fixedly connected to the top of the inner wall of the mixing box, and the inner wall of the inner gear ring is meshed with the outer surfaces of four rotating gears.

[0020] By adopting the above technical solution, water and urea can be mixed more comprehensively.

[0021] In summary, this application includes the following beneficial technical effects:

[0022] (1) The present application arranges the heating component, the center rod, the spray component, the wall scraping component, the inner wave ring and the driving component, so that the spray component can perform rotational spraying, and the spray component will be driven by the inner wave ring to move when rotating, so that the spray component can spray the solvent more comprehensively, so that the solvent and the hot air are in more comprehensive contact, thereby improving the pyrolysis effect, avoiding the waste of hot air, and improving the utilization rate of hot air;

[0023] (2) The present application arranges a cross plate, a mixing rod, a self-rotating gear and an inner gear ring so that the center rod can simultaneously drive the mixing rod to rotate and rotate itself, thereby more comprehensively mixing water and urea and improving the mixing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of this application;

[0025] Figure 2 It is a schematic diagram of the overall cross-sectional structure of this application;

[0026] Figure 3 This is a schematic diagram of the structure of the drive component of this application;

[0027] Figure 4 This is a schematic cross-sectional view of the spray assembly of the present application;

[0028] Figure 5 For this application Figure 3 The enlarged structural diagram at A in the middle;

[0029] Figure 6 For this application Figure 4 Enlarged structural diagram at B in the middle.

[0030] Description of the numbers in the figure:

[0031] 100, main body module; 110, pyrolysis box; 120, exhaust pipe; 130, discharge pipe; 140, heating assembly; 141, annular heating pipe; 142, connecting pipe; 143, air intake pipe; 150, mixing box; 160, support rod;

[0032] 200, spraying pyrolysis module; 210, center rod; 220, spraying assembly; 221, movable bar; 222, spraying pipe; 223, nozzle; 224, telescopic tube; 225, L-shaped rod; 226, ball; 230, scraping assembly; 231, movable cylinder; 232, scraping rod; 233, cleaning brush; 240, inner wave ring; 250, driving assembly; 251, driving motor; 252, connecting gear; 253, transmission belt; 254, large transmission roller; 255, small transmission roller; 260, mixing assembly; 261, cross plate; 262, mixing rod; 263, self-rotating gear; 264, inner gear ring; 270, delivery pump. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0034] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] The following is combined with Figure 1-6 This application is described in further detail.

[0037] See also Figure 1-6 A urea thermal decomposer includes a main body module 100 and a spraying pyrolysis module 200. The main body module 100 includes a pyrolysis box 110. An exhaust pipe 120 is fixedly connected to the upper part of the outer surface of the pyrolysis box 110. A discharge pipe 130 is fixedly connected to the lower part of the outer surface of the pyrolysis box 110. A heating component 140 is arranged outside the pyrolysis box 110. A mixing box 150 is fixedly connected to the top of the pyrolysis box 110. A support rod 160 is fixedly connected to the bottom of the pyrolysis box 110. A support plate is fixedly connected to the outer surface of the support rod 160. The spraying pyrolysis module 200 includes a center rod 210 rotatably connected between the pyrolysis box 110 and the inside of the mixing box 150. The top of the center rod 210 is rotatably connected to the top of the inner wall of the mixing box 150. The outer surface of the center rod 210 is arranged with eight spraying assemblies 220 at equal distances in a ring shape, a scraping wall assembly 230 is arranged between the inner wall of the pyrolysis box 110 and the outer surface of the center rod 210, an inner wave ring 240 is rotatably connected to the top of the inner wall of the pyrolysis box 110, and the inner wave ring 240 is connected to the scraping wall assembly 230, a driving assembly 250 connected to the center rod 210 and the scraping wall assembly 230 is arranged on the top of the support plate, a mixing assembly 260 is arranged between the outer surface of the center rod 210 and the interior of the mixing box 150, a delivery pump 270 located inside the mixing box 150 is fixedly installed on the outer surface of the center rod 210, a filter is fixedly connected to the input end of the delivery pump 270, and the eight spraying assemblies 220 are all connected to the inner wave ring 240.

[0038] When in use, urea and water are added into the interior of the mixing box 150, and then the staff turns on the driving assembly 250 to drive the central rod 210 and the scraper assembly 230 to rotate. During the rotation of the central rod 210, the mixing assembly 260 will mix the water and urea in the mixing box 150, and obtain urea solvent after the mixing is completed. Then, the delivery pump 270 is turned on to draw the urea solvent into the interior of the central rod 210 and supply it to the eight spray assemblies 220 for spraying, and the hot air is blown into the pyrolysis box 110 through the heating assembly 140. The eight spray assemblies 220 will be driven by the central rod 210 to rotate and spray the urea solvent, and while the spray assembly 220 is moving, the scraper assembly 230 will drive the inner wave ring 240 to rotate, and the inner wave ring 240 will push the spray assembly 220 to move and retract during rotation, so that the spray assembly 220 rotates and sprays flexibly, so that the solvent and the hot air are in more comprehensive contact, avoiding the waste of hot air.

[0039] The spray assembly 220 includes a movable bar 221 fixedly connected to the outer surface of the center rod 210, a spray pipe 222 is slidably connected inside the movable bar 221, and a plurality of spray heads 223 are fixedly connected to the outer surface of the spray pipe 222 in a straight line and at equal distances, one end of the spray pipe 222 is fixedly connected to a telescopic pipe 224, the telescopic pipe 224 is fixedly connected to the outer surface of the center rod 210, and a spring is fixedly connected between one end of the spray pipe 222 and one end of the inner wall of the movable bar 221, and the spray assembly The spray pipe 220 further includes an L-shaped rod 225 fixedly connected to the top of the spray pipe 222, one end of the L-shaped rod 225 is movably connected to a ball 226, the outer surface of the ball 226 contacts the inner wall of the inner wave ring 240, and the scraper assembly 230 includes a movable cylinder 231 rotatably sleeved on the outer surface of the center rod 210, the outer surface of the movable cylinder 231 is rotatably connected to the bottom of the inner wall of the pyrolysis box 110, and the outer surface of the movable cylinder 231 is fixedly connected to two scraper rods 232, and the outer surface of the scraper rods 232 is The surface contacts the inner wall of the pyrolysis box 110, one end of the two scraping rods 232 is fixedly connected to the inner wave ring 240, and the outer surfaces of the two scraping rods 232 are fixedly connected to two cleaning brushes 233. The driving assembly 250 includes a driving motor 251 fixedly connected to the top of the support plate, and the output shaft of the driving motor 251 and the bottom end of the movable cylinder 231 are fixedly connected with a connecting gear 252, and the outer surfaces of the two connecting gears 252 are meshed with each other. A large transmission roller 254 is fixedly connected to the bottom end of the center rod 210, and a small transmission roller 255 is fixedly connected to the output shaft of the driving motor 251. A transmission belt 253 is transmission-connected between the small transmission roller 255 and the outer surface of the large transmission roller 254. The heating assembly 140 includes an annular heating pipe 141 arranged outside the pyrolysis box 110, and a plurality of connecting pipes 142 are fixedly connected between the inner wall of the annular heating pipe 141 and the outer surface of the pyrolysis box 110, and an air intake pipe 143 is fixedly connected to the outer surface of the annular heating pipe 141.

[0040] The telescopic tube 224 delivers the urea solvent into the spray pipe 222 and sprays it through the multiple nozzles 223. The multiple nozzles 223 are driven by the central rod 210 to rotate and spray the urea solvent. When the nozzles 223 rotate, the movable cylinder 231 drives the two scraper rods 232 to drive the inner wave ring 240 to rotate. The ball 226 will roll against the inner wall of the inner wave ring 240 through the elastic force of the spring, and the waves inside the inner wave ring 240 will push the spray pipe 222 to rotate in the movable cylinder. The movable bar 221 moves internally, so that the multiple nozzles 223 can spray urea solvent while rotating, and the hot air is sent into the annular heating pipe 141 through the air intake pipe 143, and is evenly blown into the pyrolysis box 110 through the annular heating pipe 141 and the multiple air intake pipes 143, so that the solvent and the hot air are in more comprehensive contact, thereby improving the pyrolysis effect. The hot air is sent into the annular heating pipe 141 through the air intake pipe 143, and is evenly blown into the pyrolysis box 110 through the annular heating pipe 141 and the multiple air intake pipes 143.

[0041] The mixing assembly 260 includes a cross plate 261 fixedly connected to the outer surface of the center rod 210 and located inside the mixing box 150. Four mixing rods 262 are rotatably connected inside the cross plate 261. The tops of the four mixing rods 262 are fixedly connected to self-rotating gears 263. The top of the inner wall of the mixing box 150 is fixedly connected to an inner gear ring 264. The inner wall of the inner gear ring 264 meshes with the outer surfaces of the four self-rotating gears 263.

[0042] Turn on the drive motor 251, and the drive motor 251 will rotate through the meshing transmission movable cylinder 231 of the two connecting gears 252. At the same time, the small transmission roller 255, the transmission belt 253 and the large transmission roller 254 will reduce the speed of the center rod 210. During the rotation of the center rod 210, the cross plate 261 will be driven to rotate. During the rotation of the cross plate 261, the four mixing rods 262 and the self-rotating gear 263 will be driven to rotate. During the rotation of the self-rotating gear 263, the inner gear ring 264 will be driven to rotate. The self-rotating gear 263 drives the mixing rod 262 to rotate, thereby mixing water and urea.

[0043] The implementation principle of the embodiment of the present application is as follows: when in use, urea and water are added into the mixing box 150, and then the staff turns on the driving motor 251. The driving motor 251 will rotate through the meshing transmission movable cylinder 231 of the two connecting gears 252, and at the same time, the small transmission roller 255, the transmission belt 253 and the large transmission roller 254 are used to reduce the speed of the central rod 210. The central rod 210 will drive the cross plate 261 to rotate during the rotation. The cross plate 261 will drive four mixing rods 262 and the self-rotating gear 263 to rotate during the rotation. The self-rotating gear 263 will be driven by the inner gear ring 264 to rotate. The self-rotating gear 263 drives the mixing rod 262 to rotate so as to mix the water and urea. After the mixing is completed, the urea solvent is obtained. Then, the delivery pump 270 is turned on to draw the urea solvent into the interior of the central rod 210 and supply it to the eight telescopic tubes 224. The telescopic tube 224 delivers the urea solvent into the spray pipe 222 and enters through multiple nozzles 223. The plurality of nozzles 223 are driven by the central rod 210 to rotate and spray the urea solvent, and while the nozzles 223 rotate, the movable cylinder 231 drives the two scraping rods 232 to drive the inner wave ring 240 to rotate, and the ball 226 will roll against the inner wall of the inner wave ring 240 through the elastic force of the spring, and the waves inside the inner wave ring 240 will push the spray pipe 222 to move inside the movable bar 221, so that the plurality of nozzles 223 can spray the urea solvent while rotating. The hot air is sent into the annular heating pipe 141 through the air inlet pipe 143, and is evenly blown into the pyrolysis box 110 through the annular heating pipe 141 and multiple air inlet pipes 143, so that the solvent and the hot air are in more comprehensive contact, avoiding the waste of hot air. The subsequent air is discharged through the exhaust pipe 120, and the rotation of the scraper rod 232 will drop the crystals on the inner wall of the pyrolysis box 110, and the crystals will be discharged together with the solution through the discharge pipe 130, and the rotation of the cleaning brush 233 will clean the multiple nozzles 223.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A urea thermal decomposer, comprising a main module (100) and a spraying pyrolysis module (200), characterized in that: The main body module (100) comprises a pyrolysis box (110), an exhaust pipe (120) is fixedly connected to the upper part of the outer surface of the pyrolysis box (110), a discharge pipe (130) is fixedly connected to the lower part of the outer surface of the pyrolysis box (110), a heating component (140) is arranged outside the pyrolysis box (110), a mixing box (150) is fixedly connected to the top of the pyrolysis box (110), a support rod (160) is fixedly connected to the bottom of the pyrolysis box (110), and a support plate is fixedly connected to the outer surface of the support rod (160): The spraying pyrolysis module (200) comprises a central rod (210) rotatably connected between the pyrolysis box (110) and the inside of the mixing box (150), the top end of the central rod (210) is rotatably connected to the top of the inner wall of the mixing box (150), the outer surface of the central rod (210) is provided with eight spraying assemblies (220) in a circular shape and at equal distances, a wall scraping assembly (230) is provided between the inner wall of the pyrolysis box (110) and the outer surface of the central rod (210), the top of the inner wall of the pyrolysis box (110) is rotatably connected to an inner wave ring (240), and the inner wave ring (240) is provided to the inner wall of the pyrolysis box (110). The wave ring (240) is connected to the wall scraper assembly (230), and a driving assembly (250) connected to the central rod (210) and the wall scraper assembly (230) is arranged on the top of the support plate. A mixing assembly (260) is arranged between the outer surface of the central rod (210) and the interior of the mixing box (150). A delivery pump (270) located inside the mixing box (150) is fixedly installed on the outer surface of the central rod (210), and a filter is fixedly connected to the input end of the delivery pump (270). The eight spraying assemblies (220) are all connected to the inner wave ring (240).

2. A urea thermal decomposer according to claim 1, characterized in that: The spray assembly (220) comprises a movable bar (221) fixedly connected to the outer surface of the central rod (210); a spray pipe (222) is slidably connected inside the movable bar (221); a plurality of spray heads (223) are fixedly connected to the outer surface of the spray pipe (222) in a straight line and at equal distances; one end of the spray pipe (222) is fixedly connected to a telescopic tube (224); the telescopic tube (224) is fixedly connected to the outer surface of the central rod (210); and a spring is fixedly connected between one end of the spray pipe (222) and one end of the inner wall of the movable bar (221).

3. A urea thermal decomposer according to claim 2, characterized in that: The spray assembly (220) further comprises an L-shaped rod (225) fixedly connected to the top of the spray pipe (222), one end of the L-shaped rod (225) being movably connected to a ball (226), and the outer surface of the ball (226) is in contact with the inner wall of the inner wave ring (240).

4. A urea thermal decomposer according to claim 3, characterized in that: The wall scraping assembly (230) comprises a movable cylinder (231) rotatably sleeved on the outer surface of the center rod (210); the outer surface of the movable cylinder (231) is rotatably connected to the bottom of the inner wall of the pyrolysis box (110); two wall scraping rods (232) are fixedly connected to the outer surface of the movable cylinder (231); the outer surfaces of the wall scraping rods (232) are in contact with the inner wall of the pyrolysis box (110); one end of the two wall scraping rods (232) are fixedly connected to the inner wave ring (240); and the outer surfaces of the two wall scraping rods (232) are fixedly connected to two cleaning brushes (233).

5. A urea thermal decomposer according to claim 4, characterized in that: The driving assembly (250) comprises a driving motor (251) fixedly connected to the top of the supporting plate, the output shaft of the driving motor (251) and the bottom end of the movable cylinder (231) are fixedly connected with a connecting gear (252), the outer surfaces of the two connecting gears (252) are meshed with each other, the bottom end of the center rod (210) is fixedly connected with a large transmission roller (254), the output shaft of the driving motor (251) is fixedly connected with a small transmission roller (255), and a transmission belt (253) is connected between the small transmission roller (255) and the outer surface of the large transmission roller (254).

6. A urea thermal decomposer according to claim 5, characterized in that: The heating component (140) comprises an annular heating pipe (141) arranged outside the pyrolysis box (110), a plurality of connecting pipes (142) are fixedly connected between the inner wall of the annular heating pipe (141) and the outer surface of the pyrolysis box (110), and an air intake pipe (143) is fixedly connected to the outer surface of the annular heating pipe (141).

7. A urea thermal decomposer according to claim 6, characterized in that: The mixing assembly (260) comprises a cross plate (261) fixedly connected to the outer surface of the central rod (210) and located inside the mixing box (150), and four mixing rods (262) are rotatably connected inside the cross plate (261), and the top ends of the four mixing rods (262) are fixedly connected to self-rotating gears (263).

8. A urea thermal decomposer according to claim 7, characterized in that: An inner gear ring (264) is fixedly connected to the top of the inner wall of the mixing box (150), and the inner wall of the inner gear ring (264) is meshed with the outer surfaces of the four self-rotating gears (263).

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