Rotary kiln system

Abstract

The invention provides a rotary kiln system which comprises a rotary kiln cylinder, the kiln head end of the rotary kiln cylinder is rotationally connected with a smoke outlet pipe in a sealed mode, a feeding hopper is arranged at the free end of the smoke outlet pipe, the bottom of the feeding hopper is communicated with a feeding pipe penetrating through the smoke outlet pipe to stretch into the rotary kiln cylinder, and the free end of the smoke outlet pipe is communicated with a negative pressure channel. A negative pressure fan is mounted in the negative pressure channel; a cooling cover with an opening in the tail end is arranged at the kiln tail end of the rotary kiln barrel, the cooling cover is provided with a kiln tail sealing cover connected with the kiln tail end of the rotary kiln barrel in a sealing and rotating mode, a combustor is installed at the kiln tail sealing cover and connected with a combustion spray pipe extending into the rotary kiln barrel, and the combustion spray pipe is communicated with a combustion spray head. A plurality of spiral guide rods are rotationally connected to the bottom in the cooling cover, and a conveying motor used for driving the spiral guide rods to rotate is installed outside the cooling cover. Materials are heated in the middle of the rotary kiln cylinder, the heating efficiency of the materials is effectively improved, a negative pressure air cooling mode is adopted, and the waste gas treatment cost is effectively reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal processing equipment and relates to a rotary kiln system. Background Art

[0002] As a traditional building material production equipment, rotary kiln systems have long played a vital role in the manufacture of sintered bricks and tiles. Early rotary kiln systems, such as downdraft kilns and tunnel kilns, mostly employed intermittent operation. While these systems met basic production needs, they lacked significant energy efficiency and environmental protection. With technological advancements, the search for more efficient, energy-saving, and environmentally friendly rotary kiln systems has begun.

[0003] Against this backdrop, rotary kiln systems have gradually emerged as an advanced solution. With their continuous operation, high degree of automation, and high production capacity, rotary kilns have found widespread application in industries such as building materials, metallurgy, and chemicals. Using a slowly rotating cylindrical structure, materials are heated as they move along an inclined angle within the kiln, achieving continuous production.

[0004] However, although rotary kilns have been significantly improved compared to traditional rotary kilns, their heating mechanism still has certain limitations. Currently, most rotary kiln designs install burners at the tail of the kiln, heating the kiln by spraying fire into the kiln. This heating method causes the heat to be mainly concentrated in the tail of the kiln, and can only fully heat the materials in this area, while the rest of the rotary kiln mainly relies on waste heat for preheating, resulting in low overall heating efficiency. In addition, the product after high-temperature heating needs to be cooled quickly for subsequent processing or storage, and air cooling is usually used for cooling. This process not only generates a large amount of hot air, but also carries out a lot of dust, which not only wastes heat resources but also increases additional waste gas treatment costs and increases the cost of product cooling. Summary of the Invention

[0005] The purpose of the present invention is to provide a rotary kiln system, which heats the material in the middle of the rotary kiln cylinder, which can effectively improve the heating efficiency of the material, and adopts a negative pressure air cooling method to centrally treat the generated waste gas, which can effectively reduce the waste gas treatment cost.

[0006] In order to solve the above technical problems, the present invention provides a rotary kiln system, comprising a rotary kiln cylinder, a support base is provided at the bottom of the rotary kiln cylinder, a driving motor for driving the rotary kiln cylinder to rotate is installed at the upper end of the support base, the rotary kiln cylinder is divided into a preheating section near the kiln head end, a combustion section in the middle and a cooling section near the kiln tail end, the kiln head end of the rotary kiln cylinder is sealed and rotatably connected to a smoke outlet pipe, a feeding hopper is provided at the free end of the smoke outlet pipe, the bottom of the feeding hopper is connected to a feeding pipe that passes through the smoke outlet pipe and extends into the rotary kiln cylinder, so a spiral feeding rod is rotatably connected in the feeding pipe, a feeding motor for driving the spiral feeding rod to rotate is installed at the upper end of the feeding hopper, the free end of the smoke outlet pipe is connected to a negative pressure channel, and a negative pressure fan is installed in the negative pressure channel;

[0007] A cooling hood is provided at the kiln tail end of the rotary kiln cylinder, and the cooling hood is provided with a kiln tail sealing hood which is sealed and rotatably connected to the kiln tail end of the rotary kiln cylinder. A burner is installed at the kiln tail sealing hood, and the burner is connected to a combustion nozzle which passes through the kiln tail sealing hood and extends into the rotary kiln cylinder. The combustion nozzle is connected to a plurality of downwardly arranged combustion nozzles in the combustion section. The cooling hood is open at one end away from the kiln tail sealing hood, and the bottom of the cooling hood is rotatably connected to a plurality of spiral guide rods arranged in parallel outwardly, and a conveying motor for driving the spiral guide rods to rotate is installed outside the cooling hood.

[0008] By adopting the above technical solution, before the equipment is put into operation, gas is first introduced into the combustion nozzle through the burner, and the gas ejected from the combustion nozzle is ignited by the burner. After the gas is burned, flames are ejected downwards, and the negative pressure motor drives the negative pressure fan to rotate, generating negative pressure so that the airflow enters from the inlet end of the cooling cover, and enters the rotary kiln cylinder along the cooling cover to provide oxygen required for combustion. The negative pressure also causes the hot smoke generated after combustion to gradually enter the smoke outlet pipe.

[0009] The material to be heated is added to the feeding hopper through the elevator. The feeding motor drives the spiral feeding rod to rotate and gradually add the material in the feeding hopper into the rotary kiln cylinder. The material in the feeding pipe is preheated by the high-temperature flue gas in the smoke outlet pipe. When the material enters the preheating section of the rotary kiln cylinder, the hot smoke generated by the combustion preheats the material again. When the driving motor drives the rotary kiln cylinder to rotate, the material rolls and continuously moves to the kiln tail. When the material moves to the combustion section of the rotary kiln cylinder, the flame generated by the combustion of the gas directly heats the material downward.

[0010] After passing through the combustion section, the material gradually moves to the cooling section of the rotary kiln cylinder. At this time, due to the continuous inflow of cold air from the outside, the finished material here can be air-cooled until the finished product falls from the kiln tail of the rotary kiln cylinder to the bottom of the cooling hood. The conveying motor drives the spiral guide rod to continuously convey the material outward. The continuous inflow of cold air in the process also continuously dries the finished material. When it is discharged from the cooling hood, it reaches the temperature required for cooling.

[0011] The present invention is further configured as follows: a gear ring is provided on the outside of the middle part of the rotary kiln cylinder, rolling rings are provided on both sides of the gear ring on the outside of the rotary kiln cylinder, one support seat is provided at the front, middle and rear positions of the rotary kiln cylinder, the upper end of the middle support seat is rotatably connected to a driving gear meshing with the gear ring, the power output shaft of the drive motor is connected to the driving gear, and the upper ends of the support seats at both ends are rotatably connected to tugboats that cooperate with corresponding rolling rings.

[0012] The present invention is further configured such that a cyclone dust collector is provided on one side of the negative pressure channel, the negative pressure channel is connected to the cross-sectional direction of the upper part of the cyclone dust collector, a pulse dust collector is provided on one side of the cyclone dust collector, the outlet end of the cyclone dust collector is connected to the inlet end of the pulse dust collector, the outlet end of the pulse dust collector is connected to the exhaust gas purifier, and the outlet end of the exhaust gas purifier is connected to the exhaust duct.

[0013] The present invention is further configured such that the outer wall of the feeding pipe is provided with spiral heat-conducting fins inside the smoke outlet pipe.

[0014] The present invention is further configured such that a heat-insulating mounting frame is provided on one side of the negative pressure channel, and a negative pressure motor corresponding to the negative pressure fan is installed on the heat-insulating mounting frame, and the power output shaft of the negative pressure motor is connected to the negative pressure fan through a transmission shaft.

[0015] The present invention is further configured such that two adjacent spiral guide rods are arranged opposite to each other, one end of each spiral guide rod extends out of the cooling cover and is connected to a transmission gear, two adjacent transmission gears are meshed, and the power output shaft of the conveying motor is meshed with one of the transmission gears.

[0016] The present invention is further configured such that the bottom of the cooling cover is recessed downward to form a plurality of arc-shaped conveying grooves corresponding to each spiral guide rod.

[0017] The present invention is further configured such that the kiln head end of the rotary kiln cylinder contracts inward to form a limiting ring, an inner connecting pipe is provided outwardly of the limiting ring, the feeding pipe extends from the inner connecting pipe into the rotary kiln cylinder, and a sealing outer sleeve is provided on the end of the smoke outlet pipe away from the negative pressure channel, which covers the inner connecting pipe and is sealed and rotatably connected thereto.

[0018] The present invention is further configured such that a hollow connecting frame connected to the free end of the combustion nozzle is provided in the sealing outer sleeve.

[0019] The present invention is further configured such that an anti-bending strip is connected above the combustion nozzle, the two ends of the anti-bending strip are respectively connected to the kiln tail sealing cover and the hollow connecting frame, and a plurality of inclined support strips are connected between the anti-bending strip and the combustion nozzle, and each two adjacent inclined support strips are V-shaped with the opening facing upward or downward.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] First, the present invention divides the rotary kiln cylinder into a preheating section, a combustion section, and a cooling section. The burner directly heats the material in the combustion section using the combustion flame through the combustion nozzle on the combustion nozzle. Compared with the existing method of spraying fire into the cylinder for heating, the direct use of flame heating can effectively improve the heating efficiency. In addition, the waste heat generated by the combustion preheats the material twice in the rotary kiln cylinder and the smoke outlet pipe, which can effectively improve the overall thermal efficiency.

[0022] Secondly, the present invention generates negative pressure through the negative pressure fan in the negative pressure channel, so that the outside air can gradually enter the system, along the cooling cover and the rotary kiln cylinder into the smoke outlet pipe, the outside cold air can be used in the cooling cover to fully cool the finished products, and the finished products can also be effectively cooled in the cooling section in the rotary kiln cylinder. At the same time, the incoming air also continuously provides oxygen required for combustion;

[0023] Third, the airflow carries the dust and harmful gases flying from the material and passes through the cyclone dust collector, pulse dust collector and exhaust gas purifier in sequence before being discharged. The same equipment can be used to remove dust and purify the combustion exhaust gas and the air-cooled exhaust gas, which can effectively reduce the cost of product cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a partial cross-sectional view used to show the internal structure of the rotary kiln cylinder;

[0026] Figure 3 It is a partial cross-sectional view used to show the internal structure of the smoke pipe and the feeding pipe;

[0027] Figure 4 It is a partial cross-sectional view used to show the internal structure of the negative pressure channel;

[0028] Figure 5 Used to demonstrate the connection between the conveying motor and the transmission gear;

[0029] Figure 6 It is a partial cross-sectional view used to show the internal structure of the cooling cover.

[0030] Among them, 1. Rotary kiln cylinder; 2. Gear ring; 3. Roller ring; 4. Support seat; 5. Drive gear; 6. Drive motor; 7. Puller; 8. Smoke outlet pipe; 9. Limiting ring; 10. Internal connecting pipe; 11. Sealing outer sleeve; 12. Feeding hopper; 13. Feeding pipe; 14. Spiral heat conducting fin; 15. Spiral feeding rod; 16. Feeding motor; 17. Negative pressure channel; 18. Negative pressure fan; 19. Heat insulation mounting frame; 2 0. Negative pressure motor; 21. Cyclone dust collector; 22. Pulse dust collector; 23. Exhaust gas purifier; 24. Exhaust flue; 25. Cooling hood; 26. Kiln tail sealing hood; 27. Burner; 28. Combustion nozzle; 29. Combustion nozzle; 30. Hollow connecting frame; 31. Anti-bending pull bar; 32. Inclined support bar; 33. Spiral guide rod; 34. Arc conveying trough; 35. Transmission gear; 36. Conveying motor. DETAILED DESCRIPTION

[0031] The following is a detailed description of a rotary kiln system according to the present invention, with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are greatly simplified and not to exact scale, and are provided solely for the purpose of conveniently and clearly illustrating the embodiments of the present invention. Identical or similar reference numerals in the drawings represent identical or similar components.

[0032] Example, see Figure 1-6 , a rotary kiln system includes a rotary kiln cylinder 1, a gear ring 2 is provided on the outside of the middle part of the rotary kiln cylinder 1, a roller ring 3 is provided on both sides of the gear ring 2 on the outside of the rotary kiln cylinder 1, and three support seats 4 corresponding to the gear ring 2 and the two roller rings 3 are provided below the rotary kiln cylinder 1, the upper end of the middle support seat 4 is rotatably connected to both sides of the gear ring 2 with a driving gear 5 meshing with the gear ring 2, and the upper end of the support seat 4 is installed on both sides of the gear ring 2 with two driving motors 6 for driving the rotary kiln cylinder 1 to rotate, the power output shaft of the driving motor 6 is connected to the driving gear 5, the upper ends of the support seats 4 at both ends are rotatably connected to both sides of the corresponding roller ring 3 with a tugboat 7 matching the corresponding roller ring 3, and the rotary kiln cylinder 1 is divided into a preheating section near the kiln head end, a combustion section in the middle and a cooling section near the kiln tail end.

[0033] The kiln head end of the rotary kiln cylinder 1 is sealed and rotatably connected to a downwardly inclined smoke outlet pipe 8. The kiln head end of the rotary kiln cylinder 1 is contracted inward to form a circle of limiting ring 9. The limiting ring 9 is provided with a section of inner connecting pipe 10 outward. The end of the smoke outlet pipe 8 away from the negative pressure channel 17 is provided with an outer sleeve inner connecting pipe 10 and a sealed outer sleeve 11 is sealed and rotatably connected to the outer sleeve. A feeding hopper 12 is provided at the free end of the smoke outlet pipe 8. The bottom of the feeding hopper 12 is connected to a feeding pipe 13 that passes through the smoke outlet pipe 8 and extends into the rotary kiln cylinder 1. The feeding pipe 13 extends into the rotary kiln cylinder 1 from the internal connecting pipe 10. The feeding pipe 13 passes through the smoke outlet pipe 8 so that the hot smoke in the smoke outlet pipe 8 can preheat the material in the feeding pipe 13. A spiral heat-conducting fin 14 is provided on the outer wall of the feeding pipe 13 inside the smoke outlet pipe 8, so a spiral feeding rod 15 is rotatably connected to the feeding pipe 13. A feeding motor 16 for driving the spiral feeding rod 15 to rotate is installed on the upper end of the feeding hopper 12. The free end of the smoke outlet pipe 8 is connected to a negative pressure channel 17, in which two negative pressure fans 18 are installed. A heat insulation mounting frame 19 is provided on one side of the negative pressure channel 17, and two negative pressure motors 20 corresponding to the negative pressure fans 18 are installed on the heat insulation mounting frame 19. The power output shaft of the negative pressure motor 20 is connected to the negative pressure fan 18 through a transmission shaft.

[0034] A cyclone dust collector 21 is provided on one side of the negative pressure channel 17, and the negative pressure channel 17 is connected to the cross-sectional direction of the upper part of the cyclone dust collector 21. A pulse dust collector 22 is provided on one side of the cyclone dust collector 21, and the outlet end of the cyclone dust collector 21 is connected to the inlet end of the pulse dust collector 22. The outlet end of the pulse dust collector 22 is connected to an exhaust gas purifier 23, and the outlet end of the exhaust gas purifier 23 is connected to an exhaust duct 24. The cyclone dust collector 21, the pulse dust collector 22 and the exhaust gas purifier 23 are all existing conventional technologies, so they will not be described in detail.

[0035] A cooling hood 25 is provided at the kiln tail end of the rotary kiln cylinder 1. The cooling hood 25 is provided with a kiln tail sealing hood 26 which is sealed and rotatably connected to the kiln tail end of the rotary kiln cylinder 1. A burner 27 is installed at the kiln tail sealing hood 26. The burner 27 is connected to a combustion nozzle 28 which passes through the kiln tail sealing hood 26 and extends into the rotary kiln cylinder 1. The combustion nozzle 28 is connected to a plurality of downwardly arranged combustion nozzles 29 in the combustion section, so that the material can be heated by flame through the combustion nozzles 29 in the combustion section. A hollow connecting frame 30 connected to the free end of the combustion nozzle 29 is provided in the sealed outer sleeve 11, and an anti-bending strip 31 is connected above the combustion nozzle 28. The two ends of the anti-bending strip 31 are respectively connected to the kiln tail sealing cover 26 and the hollow connecting frame 30. A number of inclined support bars 32 are connected between the anti-bending strip 31 and the combustion nozzle 28. Each two adjacent inclined support bars 32 are in a V-shape with the opening facing upward or downward. Through the connection of the inclined support bar 32 with the anti-bending strip 31 and the combustion nozzle 28, it can effectively prevent the combustion nozzle 28 from bending downward due to gravity due to its excessive length.

[0036] The cooling hood 25 is open at one end away from the kiln tail sealing hood 26. The bottom of the cooling hood 25 is rotatably connected to a plurality of spiral guide rods 33 arranged in parallel and away from the rotary kiln cylinder 1. Every two adjacent spiral guide rods 33 are arranged opposite to each other. The bottom of the cooling hood 25 is recessed downward to form a plurality of arc-shaped conveying grooves 34 corresponding to each spiral guide rod 33. One end of each spiral guide rod 33 extends out of the cooling hood 25 and is connected to a transmission gear 35. Every two adjacent transmission gears 35 are engaged. A conveying motor 36 for driving the spiral guide rods 33 to rotate is installed outside the cooling hood 25. The power output shaft of the conveying motor 36 is engaged with one of the transmission gears 35, so that all the spiral guide rods 33 can be driven by one conveying motor 36 to rotate and convey materials.

[0037] Working principle: Before the equipment is put into operation, gas is first introduced into the combustion nozzle 28 through the burner 27, and the gas ejected from the combustion nozzle 29 is ignited by the burner 27. After the gas burns, flames are ejected downwards, and the negative pressure motor 20 drives the negative pressure fan 18 to rotate, generating negative pressure so that the airflow enters from the inlet end of the cooling cover 25, and then enters the rotary kiln cylinder 1 along the cooling cover 25 to provide oxygen required for combustion. In addition, the negative pressure causes the hot smoke generated after combustion to gradually enter the smoke outlet pipe 8, and then pass through the cyclone dust collector 21, the pulse dust collector 22 and the exhaust gas purifier 23 before being discharged;

[0038] The material to be heated is added to the feeding hopper 12 through the elevator, and the unloading motor 16 drives the spiral feeding rod 15 to rotate to gradually add the material in the feeding hopper 12 to the rotary kiln barrel 1. The material in the feeding pipe 13 is preheated by the high-temperature flue gas in the smoke outlet pipe 8. When the material enters the preheating section of the rotary kiln barrel 1, the hot smoke generated by the combustion preheats the material again. When the driving motor 6 drives the rotary kiln barrel 1 to rotate, the material rolls and continuously moves to its kiln tail position. When the material moves to the combustion section of the rotary kiln barrel 1, the flame generated by the combustion of the gas directly heats the material downward.

[0039] After passing through the combustion section, the material gradually moves to the cooling section of the rotary kiln barrel 1. At this time, due to the continuous inflow of cold air from the outside, the finished material here can be air-cooled until the finished product falls from the kiln tail of the rotary kiln barrel 1 to the bottom of the cooling cover 25. The conveying motor 36 drives the spiral guide rod 33 to continuously convey the material outward. The cold air continuously entering during the process also continuously dries the finished material. When it is discharged from the cooling cover 25, it reaches the temperature required for cooling.

[0040] It should also be noted that all references to "disposed" and similar descriptors in this application (especially in this specification) express that two structures have or exist in a connection relationship. However, the specific means by which the two structures are connected are not particularly limited, and are generally conventional connection means. In other words, such means should be understood as existing in the art and do not require further elaboration. For example, "n is disposed on m" simply expresses that structure n is present on structure m, while the two are specifically connected by welding, riveting, adhesive bonding, or integral molding, all of which are within the scope of protection of this application. Another example is "y is rotatably disposed on x" simply expresses that y and x are rotatable relative to each other, while whether the two are connected by a bearing, y directly passes through x and is rotatably connected to x, or other feasible methods are all within the scope of protection of this application.

[0041] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A rotary kiln system, comprising a rotary kiln cylinder (1), a support base (4) being provided below the rotary kiln cylinder (1), a drive motor (6) being installed on the upper end of the support base (4) for driving the rotary kiln cylinder (1) to rotate, characterized in that: The rotary kiln cylinder (1) is divided into a preheating section near the kiln head end, a combustion section in the middle, and a cooling section near the kiln tail end. The kiln head end of the rotary kiln cylinder (1) is sealed and rotatably connected to a smoke outlet pipe (8). A feeding hopper (12) is provided at the free end of the smoke outlet pipe (8). The bottom of the feeding hopper (12) is connected to a feeding pipe (13) that passes through the smoke outlet pipe (8) and extends into the rotary kiln cylinder (1). A spiral feed rod (15) is rotatably connected to the feeding pipe (13). A feeding motor (16) for driving the spiral feed rod (15) to rotate is installed at the upper end of the feeding hopper (12). The free end of the smoke outlet pipe (8) is connected to a negative pressure channel (17), and a negative pressure fan (18) is installed in the negative pressure channel (17). A cooling hood (25) is provided at the kiln tail end of the rotary kiln cylinder (1), and the cooling hood (25) is provided with a kiln tail sealing hood (26) which is sealed and rotatably connected to the kiln tail end of the rotary kiln cylinder (1). A burner (27) is installed at the kiln tail sealing hood (26), and the burner (27) is connected to a combustion nozzle (28) which passes through the kiln tail sealing hood (26) and extends into the rotary kiln cylinder (1). The combustion nozzle (28) is connected to a plurality of downwardly arranged combustion nozzles (29) in the combustion section. The cooling hood (25) is open at one end away from the kiln tail sealing hood (26). The bottom of the cooling hood (25) is rotatably connected to a plurality of outwardly arranged and parallel spiral guide rods (33). A conveying motor (36) for driving the spiral guide rods (33) to rotate is installed outside the cooling hood (25).

2. A rotary kiln system according to claim 1, characterized in that: A gear ring (2) is provided on the outer side of the middle portion of the rotary kiln cylinder (1), and rolling rings (3) are provided on both sides of the gear ring (2) on the outer side of the rotary kiln cylinder (1). One support seat (4) is provided at each of the front, middle, and rear positions of the rotary kiln cylinder (1). The upper end of the middle support seat (4) is rotatably connected to a driving gear (5) meshing with the gear ring (2), and the power output shaft of the driving motor (6) is connected to the driving gear (5). The upper ends of the support seats (4) at both ends are rotatably connected to tugs (7) that cooperate with the corresponding rolling rings (3).

3. A rotary kiln system according to claim 1, characterized in that: A cyclone dust collector (21) is provided on one side of the negative pressure channel (17), the negative pressure channel (17) is communicated with the tangential direction of the upper portion of the cyclone dust collector (21), a pulse dust collector (22) is provided on one side of the cyclone dust collector (21), the outlet end of the cyclone dust collector (21) is communicated with the inlet end of the pulse dust collector (22), the outlet end of the pulse dust collector (22) is communicated with an exhaust gas purifier (23), and the outlet end of the exhaust gas purifier (23) is communicated with a smoke exhaust duct (24).

4. A rotary kiln system according to claim 1, characterized in that: The outer wall of the feeding pipe (13) is provided with spiral heat-conducting fins (14) inside the smoke outlet pipe (8).

5. A rotary kiln system according to claim 1, characterized in that: A heat-insulating mounting frame (19) is provided on one side of the negative pressure channel (17), and a negative pressure motor (20) corresponding one to the negative pressure fan (18) is mounted on the heat-insulating mounting frame (19), and a power output shaft of the negative pressure motor (20) is connected to the negative pressure fan (18) via a transmission shaft.

6. A rotary kiln system according to claim 1, characterized in that: Each of the two adjacent spiral guide rods (33) is arranged opposite to each other, and one end of each spiral guide rod (33) extends out of the cooling cover (25) and is connected to a transmission gear (35). Each of the two adjacent transmission gears (35) is meshed, and the power output shaft of the conveying motor (36) is meshed with one of the transmission gears (35).

7. A rotary kiln system according to claim 6, characterized in that: The bottom of the cooling cover (25) is recessed downward to form a plurality of arc-shaped conveying grooves (34) corresponding to each spiral guide rod (33).

8. A rotary kiln system according to claim 1, characterized in that: The kiln head end of the rotary kiln cylinder (1) contracts inward to form a limiting ring (9), and the limiting ring (9) is provided with an inner connecting pipe (10) outwardly. The feeding pipe (13) extends from the inner connecting pipe (10) into the rotary kiln cylinder (1), and the end of the smoke outlet pipe (8) away from the negative pressure channel (17) is provided with a sealing outer sleeve (11) that covers the inner connecting pipe (10) and is sealed and rotatably connected to the inner connecting pipe (10).

9. A rotary kiln system according to claim 8, characterized in that: A hollow connecting frame (30) connected to the free end of the combustion nozzle (29) is provided in the sealing outer sleeve (11).

10. A rotary kiln system according to claim 9, characterized in that: An anti-bending strip (31) is connected above the combustion nozzle (28), and both ends of the anti-bending strip (31) are respectively connected to the kiln tail sealing cover (26) and the hollow connecting frame (30). A plurality of inclined support strips (32) are connected between the anti-bending strip (31) and the combustion nozzle (28), and each two adjacent inclined support strips (32) are in a V-shape with the opening facing upward or downward.

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