Multi-point air supply rotary kiln structure

Abstract

The multi-point air supply rotary kiln structure comprises a rotary kiln and an air supply mechanism, the air supply mechanism comprises a collecting and distributing ring, an air inlet pipe and an air supply unit, the collecting and distributing ring comprises an annular U-shaped groove, an annular cover plate and an annular sealing assembly, and the air supply unit comprises a flat pipe and an air supply pipe. In this way, fresh air is connected into the collecting and distributing ring through the air inlet pipe and then enters the kiln through the air supply unit, combustible components in high-temperature flue gas of the rotary kiln are subjected to secondary combustion after obtaining oxygen in the fresh air, the combustion intensity is regulated and controlled by regulating and controlling the fresh air volume, and therefore the internal temperature of the rotary kiln is regulated and controlled. The mode that fresh air is gathered into the gathering and distributing ring and then is dispersed into the rotary kiln in combination with the air supply unit can simplify the structural form of air supply, so that the size of the structure needed by air supply is well reduced, installation of a sealing assembly can be optimized through size reduction, the large sealing difficulty caused by the too large structural size is avoided, the sealing performance is ensured, and the service life of the rotary kiln is prolonged. Therefore, air supply pressure is guaranteed, and temperature control in the kiln is achieved by matching with the position of the air supply pipe.

Description

Technical Field

[0001] The invention relates to the technical field of rotary kilns, in particular to a multi-point air supply rotary kiln structure. Background Art

[0002] The rotary kiln is a key component of industrial furnaces. Its low energy consumption, simple system, and low pollution make it an indispensable production process in fields such as steel, metallurgy, building materials, and chemicals. However, due to the long, narrow, cylindrical structure of the rotary kiln and its single heat source, temperature control is difficult. Over- and under-firing occur throughout the rotary kiln production process, affecting product quality and causing ringing. Temperature control within the kiln is extremely challenging.

[0003] In the prior art, fresh air is introduced into the interior of the rotary kiln by setting up an annular air duct. An air supply port can be added in the middle of the rotary kiln to solve the problem of the rotary kiln having a single heat source. However, during implementation, since the annular air duct must completely surround the outside of the rotary kiln, its diameter is usually 2m or more larger than the outer diameter of the rotary kiln. As a result, due to the large diameter, it is very difficult to seal the annular air duct during operation, causing a large amount of fresh air to leak from the junction surface between the inner and outer cylinders on both sides of the annular air duct. As a result, the central air supply port cannot form effective wind pressure, and the expected effect cannot be achieved.

[0004] In view of this, it is necessary to propose a multi-point air supply rotary kiln structure to solve or at least alleviate the above-mentioned defects. Summary of the Invention

[0005] The main purpose of the present invention is to provide a multi-point air supply rotary kiln structure to solve the problem in the prior art that the rotary kiln air supply duct is prone to air leakage due to its large diameter, thereby affecting the expected effect.

[0006] To achieve the above-mentioned purpose, the present invention provides a multi-point air supply rotary kiln structure, comprising a rotary kiln and an air supply mechanism, wherein the rotary kiln has a combustion end and a feeding end; wherein,

[0007] The air supply mechanism includes a collecting and distributing ring, an air inlet pipe and an air supply unit, the collecting and distributing ring includes an annular U-shaped groove, an annular cover plate and an annular sealing assembly, and the air supply unit includes a flat tube and an air supply pipe; wherein, the annular U-shaped groove is connected to the combustion end of the rotary kiln, the opening of the annular U-shaped groove faces the side facing away from the rotary kiln, the annular cover plate is covered on the opening side of the annular U-shaped groove, the air inlet pipe is connected to the annular cover plate and is connected to the interior of the annular U-shaped groove, the annular sealing assembly is connected between the circumferential wall of the annular U-shaped groove and the annular cover plate, the flat tube is arranged on the outside of the rotary kiln, one end of the flat tube is connected to the interior of the annular U-shaped groove, the other end of the flat tube is connected to the air supply pipe, and the air supply pipe extends into the inside of the rotary kiln.

[0008] Preferably, the annular sealing assembly includes a sealing box and a sealing body, the sealing box is connected between the annular wall of the annular U-shaped groove and the annular cover plate, and the sealing box is opened on one side toward the annular cover plate, the axial thickness of the sealing body is greater than the axial thickness of the sealing box, and the sealing body is pressed between the sealing box and the annular cover plate.

[0009] Preferably, the number of the air supply units is four, and the four air supply units are arranged at equal intervals along the circumference of the rotary kiln.

[0010] Preferably, the air supply pipes of the four air supply units are staggered along the axial direction of the rotary kiln.

[0011] Preferably, the rotary kiln includes a kiln body, a fuel nozzle, a feed pipe, a gear ring assembly and a roller assembly, the fuel nozzle is connected to the combustion end, the feed pipe is connected to the feed end, the gear ring assembly and the roller assembly are both connected to the kiln body in a surrounding manner and are arranged at intervals along the axial direction of the kiln body.

[0012] Preferably, the ring gear assembly comprises a ring gear and a plurality of ring gear supports spaced apart along the circumference of the kiln body, the ring gear supports are connected to the outside of the kiln body, and the ring gear is circumferentially connected to the plurality of ring gear supports.

[0013] Preferably, the roller assembly includes a roller and a plurality of roller supports spaced apart along the circumference of the kiln body, the roller supports are connected to the outside of the kiln body, and the roller is circumferentially connected to the plurality of roller supports.

[0014] Preferably, each of the flat tubes passes through between two adjacent roller ring supports and between two adjacent gear ring supports, and is located on the inner side of the roller ring and the gear ring.

[0015] Preferably, the outer diameter of the annular U-shaped groove is smaller than the diameter of the kiln body.

[0016] Preferably, the aspect ratio of the flat tube is 1:4 to 1:4.5.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention provides a multi-point air supply rotary kiln structure, which includes a rotary kiln and an air supply mechanism. The rotary kiln has a combustion end and a feed end. The air supply mechanism includes a collecting and distributing ring, an air inlet pipe and an air supply unit. The collecting and distributing ring includes an annular U-shaped groove, an annular cover plate and an annular sealing assembly. The air supply unit includes a flat tube and an air supply pipe. The annular U-shaped groove and the annular cover plate are both connected to the combustion end of the rotary kiln. The opening of the annular U-shaped groove faces the side facing away from the rotary kiln. The annular cover plate is covered on the opening side of the annular U-shaped groove. The air inlet pipe is connected to the annular cover plate and is connected to the interior of the annular U-shaped groove. The annular sealing assembly is connected between the circumferential wall of the annular U-shaped groove and the annular cover plate. The flat tube is arranged on the outside of the rotary kiln. One end of the flat tube is connected to the interior of the annular U-shaped groove, and the other end of the flat tube is connected to the air supply pipe, and the air supply pipe extends into the inside of the rotary kiln. In this way, the fresh air is connected to the collecting and distributing ring through the air inlet pipe, and then enters the rotary kiln through the air supply unit, so that the combustible components in the high-temperature flue gas of the rotary kiln are burned for the second time after obtaining oxygen in the fresh air. The intensity of the combustion is controlled by adjusting the amount of fresh air, thereby adjusting the temperature inside the rotary kiln. The method of introducing the fresh air into the collecting and distributing ring and then distributing it to the rotary kiln in combination with the air supply unit can simplify the structure of the air supply, so as to better reduce the size of the structure required for the air supply. The reduced size can optimize the installation of the sealing component to avoid the difficulty of sealing caused by the excessive size of the structure, ensure the sealing, and thus ensure the air supply pressure, and achieve temperature control in the kiln in conjunction with the position of the air supply pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 A schematic cross-sectional view of the overall structure of an embodiment of the present invention;

[0021] Figure 2 for Figure 1 A partial enlarged schematic diagram of point A in the middle;

[0022] Figure 3 for Figure 1 Schematic diagram of the cross section along the AA direction;

[0023] Figure 4 is a schematic cross-sectional view of a ring gear assembly in one embodiment of the present invention;

[0024] Figure 5 Schematic diagram of the working state of the annular sealing assembly in one embodiment of the present invention.

[0025] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments.

[0026] Description of Figure Numbers:

[0027] 10. Rotary kiln; 110. Kiln body; 120. Fuel nozzle; 130. Feed pipe; 140. Gear ring assembly; 141. Gear ring; 142. Gear ring support; 150. Roller assembly; 151. Roller; 152. Roller support; 20. Air supply mechanism; 210. Collecting and distributing ring; 211. Annular U-shaped groove; 212. Annular cover; 213. Annular sealing assembly; 2131. Sealing box; 2132. Sealing body; 220. Air inlet pipe; 230. Air supply unit; 231. Flat tube; 232. Air supply pipe. DETAILED DESCRIPTION

[0028] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] Please see the attached Figure 1-4 In one embodiment of the present invention, a multi-point air supply rotary kiln 10 structure is provided, comprising a rotary kiln 10 and an air supply mechanism 20. The rotary kiln 10 has a combustion end and a feeding end. The technical solution thereof is as follows:

[0033] The air supply mechanism 20 includes a collecting and distributing ring 210, an air inlet pipe 220 and an air supply unit 230. The collecting and distributing ring 210 includes an annular U-shaped groove 211, an annular cover plate 212 and an annular sealing assembly 213. The air supply unit 230 includes a flat tube 231 and an air supply pipe 232. The annular U-shaped groove 211 is connected to the combustion end of the rotary kiln 10. The opening of the annular U-shaped groove 211 faces the side facing away from the rotary kiln 10. The annular cover plate 212 covers the opening of the annular U-shaped groove 211. On the other side, the air inlet pipe 220 is connected to the annular cover plate 212 and is connected to the interior of the annular U-shaped groove 211. The annular sealing assembly 213 is connected between the circumferential wall of the annular U-shaped groove 211 and the annular cover plate 212. The flat tube 231 is arranged on the outside of the rotary kiln 10, one end of the flat tube 231 is connected to the interior of the annular U-shaped groove 211, and the other end of the flat tube 231 is connected to the air supply pipe 232, and the air supply pipe 232 extends into the inside of the rotary kiln 10.

[0034] Specifically, the multi-point air supply rotary kiln 10 structure in the present application includes a rotary kiln 10 and an air supply mechanism 20. The tail of the rotary kiln 10 is the feeding end, and the head is the combustion end. Therefore, the tail of the rotary kiln 10 is usually slightly higher than the head. When in working state, the rotary cylinder rotates continuously around its own axis. The material is added from the tail and moves to the head along the inner wall of the furnace under the action of gravity. The fresh air is then connected through the air supply mechanism 20 to facilitate the secondary combustion of the combustible components in the high-temperature flue gas and change the temperature in the kiln. Usually, the air supply mechanism 20 is directly installed around the outside of the rotary kiln 10, and the fresh air is connected to the Inside the rotary kiln 10, the diameter of the rotary kiln 10 itself is relatively large. For example, if the outer diameter of the rotary kiln 10 is 5m, the outer diameter of the conventional annular air supply duct will reach 7m. At this time, it is very difficult to seal the annular air duct during operation, causing a large amount of fresh air to leak from the two sides of the annular air duct and the joint surfaces of the inner and outer cylinders, so that the central air supply port cannot form effective wind pressure and achieve the expected effect. Usually, the end diameter of the rotary kiln 10 is small. Therefore, the air supply mechanism 20 in the present application is designed through a special structural form to be connected to the combustion end, thereby reducing the structural size for better sealing.

[0035] The air supply mechanism 20 includes a collecting and distributing ring 210, an air inlet pipe 220 and an air supply unit 230. The collecting and distributing ring 210 is a container for gathering fresh air. It is annular so that it can be installed on the combustion end of the rotary kiln 10. The installation is relatively convenient. It specifically includes an annular U-shaped groove 211, an annular cover plate 212 and an annular sealing assembly 213. The annular U-shaped groove 211 is directly installed around the combustion end of the rotary kiln 10. It can be connected by welding, which is stable. The axial thickness of the combustion end of the rotary kiln 10 can be extended by processing first, so as to facilitate the installation of the annular U-shaped groove 211. The annular cover plate 212 is used to cover the annular U-shaped groove 211 to form an internal space for fresh air to flow in. It is worth noting that the annular cover plate 212 is an independently supported fixed structure, for example, it can be fixed on a frame. When installing, The annular sealing component 213 is arranged between the annular cover plate 212 and the annular U-shaped groove 211, and is pressed and combined with each other to form a good seal. During operation, this does not affect the annular U-shaped groove 211 fixed on the combustion end of the rotary kiln 10 and rotates with the entire rotary kiln 10, so that the entire collecting and distributing ring 210 is small in size and easy to install. During operation, the position of the sealing surface does not change much, so a good sealing effect can be guaranteed. It is worth mentioning that the annular sealing component 213 is connected between the circumferential wall of the annular U-shaped groove 211 and the annular cover plate 212, which means that the annular sealing component 213 is provided on the outer side of the inner ring and the inner side of the outer ring of the annular U-shaped groove 211, so that the air outlet end of the air inlet pipe 220 is located between the two annular sealing components 213 to ensure good sealing.

[0036] The air supply unit 230 is used to disperse the fresh air in the collecting and distributing ring 210 and disperse it into the rotary kiln 10. It specifically includes a flat tube 231 and an air supply pipe 232. The flat tube 231 is an air induced pipe, and the air supply pipe 232 is an air supply port connected to the inside of the rotary kiln 10. The length of the flat tube 231 determines the position of the air supply pipe 232. Therefore, in a preferred embodiment, multiple air supply units 230 can be set to transport the fresh air in the collecting and distributing ring 210 to multiple points from the same source, thereby increasing the heat source in the rotary kiln 10 to solve the problem of difficulty in temperature control of the slender furnace hall due to the single heat source in the rotary kiln 10. In this preferred embodiment, the air supply unit 230 The number of the air supply units 230 is four, and the four air supply units 230 are arranged at equal intervals along the circumference of the rotary kiln 10, so as to be evenly distributed on the four circumferential sides of the rotary kiln 10, and at the same time, the lengths of the flat tubes 231 in the four air supply units 230 are set to be different, so that the air supply pipes 232 of the four air supply units 230 are staggered along the axial direction of the rotary kiln 10. The four air supply pipes 232 (air supply ports) are distributed at four different positions along the axial direction of the rotary kiln 10, so as to disperse the heat source throughout the inner side of the rotary kiln 10, thereby not only increasing the heat source points, but also taking into account the uniformity of the distribution of the heat source points, so as to better control the temperature inside the rotary kiln 10; it can be understood that the attached Figure 1 What is shown in the figure is a cross-sectional view, which only shows the distribution diagram of the air supply pipe 232 on the upper and lower sides, while the other two sides are not shown. The specific distribution position can be set by those skilled in the art according to actual needs.

[0037] As a preferred embodiment of the present invention, the annular sealing assembly 213 includes a sealing box 2131 and a sealing body 2132, the sealing box 2131 is connected between the annular wall of the annular U-shaped groove 211 and the annular cover plate 212, and the sealing box 2131 is set with an opening on one side toward the annular cover plate 212, the axial thickness of the sealing body 2132 is greater than the axial thickness of the sealing box 2131, and the sealing body 2132 is pressed between the sealing box 2131 and the annular cover plate 212.

[0038] It should be noted that the sealing box 2131 is used for the sealing body 2132 to be built in, so that the sealing body 2132 is arranged in the sealing box 2131, and in order to form a compression bonding effect with the independently fixed annular cover plate 212 during installation, the sealing box 2131 also adopts the form of an opening on one side facing the annular cover plate 212, and the axial thickness of the sealing body 2132 is greater than the axial thickness of the sealing box 2131, so that it extends out of the sealing box 2131. In this way, after the sealing body 2132 is built in the sealing box 2131, the annular U-shaped groove 211 can be compressed and combined between the sealing body 2132 and the annular cover plate 212, thereby forming good sealing.

[0039] In detail, the sealing body 2132 can also be set to a U-shaped structure, and small holes are evenly distributed along the circumference of the bottom of the sealing box 2131; because the internal wind pressure is higher than the normal pressure, the small holes of the sealing box transmit the wind pressure to the inside of the sealing box and act on the inner side of the U-shaped groove of the sealing body. The sealing body is subjected to a positive pressure from the inside to the outside, and the contact between the outer side of the sealing body and the inner wall of the sealing box is tighter and more reliable. For details, please refer to the attached Figure 5 shown.

[0040] As a preferred embodiment of the present invention, the rotary kiln 10 includes a kiln body 110, a fuel nozzle 120, a feed pipe 130, a ring gear assembly 140 and a roller assembly 150. The fuel nozzle 120 is connected to the combustion end, the feed pipe 130 is connected to the feed end, and the ring gear assembly 140 and the roller assembly 150 are both circumferentially connected to the kiln body 110 and are spaced apart along the axial direction of the kiln body 110.

[0041] It is worth noting that the fuel nozzle 120 is used to provide roasting heat to the rotary kiln 10. It is installed at the combustion end (low end) of the kiln body 110 to burn the material sliding thereto. The feed pipe 130 is used to access the material. It is installed at the feed end (high end) of the kiln body 110 so that the material slides toward the combustion end under the action of gravity. The ring gear assembly 140 is used to drive the entire kiln body 110 to rotate, and the roller assembly 150 is used to support the kiln body 110 and all components fixedly connected to the kiln body 110. Usually, the number of the roller assembly 150 is set to two groups, which are distributed on both sides of the ring gear assembly 140 at intervals along the axial direction.

[0042] Furthermore, the ring gear assembly 140 includes a ring gear 141 and a plurality of ring gear supports 142 spaced apart along the circumference of the kiln body 110 . The ring gear supports 142 are connected to the outside of the kiln body 110 , and the ring gear 141 is circumferentially connected to the plurality of ring gear supports 142 .

[0043] It should be noted that the gear ring support 142 is used for installing the gear ring 141. By having multiple gear ring supports 142 spaced apart along the circumference of the kiln body 110, the load generated by the rotation can be evenly distributed to each support, thereby avoiding deformation or damage of the gear ring 141 due to local overload and improving structural stability.

[0044] Furthermore, the roller assembly 150 includes a roller 151 and a plurality of roller supports 152 spaced apart along the circumference of the kiln body 110 . The roller supports 152 are connected to the outside of the kiln body 110 , and the roller 151 is circumferentially connected to the plurality of roller supports 152 .

[0045] It should be understood that, since the rotary kiln 10 is generally large in size and weight, the weight of the kiln body 110 can be evenly distributed to each support by means of a plurality of roller supports 152 arranged at intervals along the circumference of the kiln body 110, thereby avoiding deformation of the supports or the kiln body 110 due to local overload, thereby forming a stable support system.

[0046] Furthermore, each of the flat tubes 231 passes through between two adjacent roller ring supports 152 and between two adjacent gear ring supports 142 , and is located on the inner side of the roller ring 151 and the gear ring 141 .

[0047] It should be noted that by adopting the form of a flat tube 231, which passes through the gap between the gear ring 141, the roller ring 151 and the outer wall of the kiln body 110, the external dimensions of the gear ring 141 and the roller ring 151 will not be increased too much. The spacing distribution characteristics of the roller ring support 152 and the gear ring support 142 are utilized to pass through two adjacent roller ring supports 152 and two adjacent gear ring supports 142. In addition, the flat tube 231 is relatively small in height but large in width, so that while ensuring a sufficient air flow area, it can be set on the inner side of the roller ring 151 and the gear ring 141 after passing through, so as to fully utilize the structural characteristics of the upper components of the rotary kiln 10, ensure that the structural dimensions are reduced while increasing the heat source points, and the structure is simple and has good sealing performance. Preferably, the height-to-width ratio of the flat tube 231 is 1:4 to 1:4.5, and the specific value can be set by those skilled in the art according to the actual size of the rotary kiln 10, the support spacing, etc.

[0048] Furthermore, the outer diameter of the annular U-shaped groove 211 is smaller than the diameter of the kiln body 110 .

[0049] It should be noted that this is done to overcome the defect in the prior art that the outer diameter of the annular air duct needs to be larger than the diameter of the rotary kiln 10 by 2m, so as to avoid being installed on the outside of the kiln body 110 while further ensuring that the outer diameter of the collecting and distributing ring 210 does not exceed the kiln body 110, thereby better controlling the small size of the collecting and distributing ring 210 of the present application, not only facilitating fixed installation, but also ensuring that the position of the sealing surface does not change much during operation, thereby ensuring good sealing and forming effective wind pressure, so that the air supply performance is stable while having the effect of multiple points from the same source.

[0050] To facilitate understanding by those skilled in the art, the working status is briefly described as follows:

[0051] When in working state, the roller ring 151 supports the kiln body 110 and all components fixedly connected to the kiln body 110, the gear ring 141 drives the kiln body 110 to rotate, and the annular U-shaped groove 211, the flat tube 231, and the air supply pipe 232 rotate together with the kiln body 110; the fresh air enters the collecting and distributing ring 210 through the air inlet pipe 220, and is then sent to different air supply pipes 232 through different flat tubes 231 to be introduced into the interior of the kiln body 110; since the fresh air contains oxygen, and the flue gas generated during the production process inside the kiln body 110 contains a large amount of combustible gases, such as CO, after the fresh air is introduced into the interior of the kiln body 110, a local combustion zone can be generated in the area near the outlet end (air supply port) of the air supply pipe 232. The intensity of the combustion can be controlled by adjusting the air volume, and combustion can be carried out at multiple points with the same source, thereby overcoming the defects of the traditional single heat source and achieving the purpose of regulating the internal temperature of the rotary kiln 10.

[0052] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A multi-point air supply rotary kiln structure, characterized in that: It includes a rotary kiln and an air supply mechanism, wherein the rotary kiln has a combustion end and a feeding end; wherein, The air supply mechanism includes a collecting and distributing ring, an air inlet pipe and an air supply unit, the collecting and distributing ring includes an annular U-shaped groove, an annular cover plate and an annular sealing assembly, and the air supply unit includes a flat tube and an air supply pipe; wherein, the annular U-shaped groove is connected to the combustion end of the rotary kiln, the opening of the annular U-shaped groove faces the side facing away from the rotary kiln, the annular cover plate is covered on the opening side of the annular U-shaped groove, the air inlet pipe is connected to the annular cover plate and is connected to the interior of the annular U-shaped groove, the annular sealing assembly is connected between the circumferential wall of the annular U-shaped groove and the annular cover plate, the flat tube is arranged on the outside of the rotary kiln, one end of the flat tube is connected to the interior of the annular U-shaped groove, the other end of the flat tube is connected to the air supply pipe, and the air supply pipe extends into the inside of the rotary kiln.

2. The multi-point air supply rotary kiln structure according to claim 1, characterized in that: The annular sealing assembly includes a sealing box and a sealing body. The sealing box is connected between the annular wall of the annular U-shaped groove and the annular cover plate, and the sealing box is set with an opening on one side facing the annular cover plate. The axial thickness of the sealing body is greater than the axial thickness of the sealing box, and the sealing body is tightly arranged between the sealing box and the annular cover plate.

3. The multi-point air supply rotary kiln structure according to claim 1, characterized in that: The number of the air supply units is four, and the four air supply units are arranged at equal intervals along the circumference of the rotary kiln.

4. The multi-point air supply rotary kiln structure according to claim 3, characterized in that: The air supply pipes of the four air supply units are staggered along the axial direction of the rotary kiln.

5. The multi-point air supply rotary kiln structure according to claim 1, characterized in that: The rotary kiln includes a kiln body, a fuel nozzle, a feed pipe, a gear ring assembly and a roller assembly. The fuel nozzle is connected to the combustion end, the feed pipe is connected to the feed end, and the gear ring assembly and the roller assembly are both connected to the kiln body in a surrounding manner and are arranged at intervals along the axial direction of the kiln body.

6. The multi-point air supply rotary kiln structure according to claim 5, characterized in that: The ring gear assembly includes a ring gear and a plurality of ring gear supports spaced apart along the circumference of the kiln body. The ring gear supports are connected to the outside of the kiln body, and the ring gear is circumferentially connected to the plurality of ring gear supports.

7. The multi-point air supply rotary kiln structure according to claim 6, characterized in that: The roller assembly includes a roller and a plurality of roller supports spaced apart along the circumference of the kiln body. The roller supports are connected to the outside of the kiln body, and the roller is connected to the plurality of roller supports in a circumferential manner.

8. The multi-point air supply rotary kiln structure according to claim 7, characterized in that: Each of the flat tubes passes through between two adjacent roller ring supports and between two adjacent gear ring supports, and is located on the inner side of the roller ring and the gear ring.

9. The multi-point air supply rotary kiln structure according to claim 5, characterized in that: The outer diameter of the annular U-shaped groove is smaller than the diameter of the kiln body.

10. The multi-point air supply rotary kiln structure according to claim 1, characterized in that: The aspect ratio of the flat tube is 1:4 to 1:4.5.

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