A rotary kiln with helical flow guide inner lining

Abstract

This utility model relates to a rotary kiln with a spiral guide lining, including a rotary kiln support, on which a kiln body is rotatably mounted, gradually tilting upwards from back to front. A feed inlet is located at the front end of the kiln body, and an air inlet is located at the rear end. A kiln body drive mechanism is provided on the rotary kiln support to drive the kiln body to rotate. A heat-resistant lining composed of refractory bricks is provided on the inner wall of the kiln body. Each refractory brick includes low-level refractory bricks and high-level refractory bricks with a height higher than the low-level refractory bricks. The high-level refractory bricks are arranged to form spiral protrusions coaxial with the kiln body. There are at least two spiral protrusions, and each spiral protrusion is spaced apart along the circumference of the kiln body. Low-level refractory bricks are positioned between adjacent spiral protrusions, forming spiral grooves between adjacent spiral protrusions. This utility model solves the technical problem in the prior art where the material has poor flowability within the kiln body, preventing effective heat exchange with the drying gas.

Description

Technical Field

[0001] This utility model relates to material drying equipment, and more particularly to a rotary kiln with a spiral guide lining. Background Technology

[0002] A rotary kiln is a common material drying equipment. It includes an inclined kiln body that gradually slopes upwards from back to front. The material drying equipment also includes a kiln drive mechanism that drives the kiln body to rotate. The kiln drive mechanism includes a geared motor, a gear ring on the kiln body, and a drive gear that meshes with the gear ring at the output end of the geared motor. The inner wall of the kiln is lined with a heat-resistant layer made of refractory bricks.

[0003] The front end (i.e., the high end) of the kiln body is equipped with a feed inlet, and the rear end (i.e., the low end) of the kiln body is equipped with an air inlet. During use, the drying gas enters the kiln body through the air inlet and then flows from back to front. The material to be dried enters the kiln body through the feed inlet. As the kiln body rotates, it flows from the high end to the low end under the action of the kiln body's inclination, and exchanges heat with the drying gas through convection, thereby realizing the drying of the material by the drying gas.

[0004] The existing rotary kiln has the following problems: the material relies entirely on the inclination of the kiln body to flow axially along the kiln body, resulting in poor material flowability. High-temperature materials are prone to forming local high-temperature zones, which leads to sintering and agglomeration of the kiln skin. In addition, the material is not evenly dispersed in the kiln body, resulting in insufficient contact between the material and the drying airflow. The thermal efficiency is generally less than 60%, which affects the quality of the material products. Utility Model Content

[0005] The purpose of this invention is to provide a rotary kiln with a spiral guide lining to solve the technical problem in the prior art where the material has poor flowability in the kiln body and cannot effectively exchange heat with the drying gas.

[0006] The technical solution of this utility model is as follows:

[0007] A rotary kiln with a spiral guide lining includes a rotary kiln support, on which a kiln body is rotatably mounted, extending upwards from back to front. A feed inlet is located at the front end of the kiln body, and an air inlet is located at the rear end. A kiln body drive mechanism is provided on the rotary kiln support to drive the kiln body to rotate. A heat-resistant lining composed of refractory bricks is provided on the inner wall of the kiln body. Each refractory brick includes low-level refractory bricks and high-level refractory bricks with a height higher than the low-level refractory bricks. The high-level refractory bricks are arranged to form spiral protrusions coaxial with the kiln body. There are at least two spiral protrusions, and each spiral protrusion is spaced apart along the circumference of the kiln body. The low-level refractory bricks form spiral grooves between adjacent spiral protrusions.

[0008] Furthermore, the cross-sectional shape of high-temperature refractory bricks and low-temperature refractory bricks is a rectangular structure with its length extending along the axis of the kiln body.

[0009] Furthermore, a convex-concave positioning structure with a convex-concave fit is provided between two adjacent refractory bricks in the circumferential direction.

[0010] Furthermore, the high-position refractory brick includes an outer portion with a radial thickness consistent with that of the low-position refractory brick, and the high-position refractory brick also includes an inner portion integrally formed with the outer portion and protruding towards the kiln body axis, wherein the circumferential width of the inner portion is smaller than that of the outer portion.

[0011] Furthermore, the inner part of the high-position refractory brick is surrounded by wear-resistant ceramic inserts.

[0012] The beneficial effects of this technical solution are as follows: In this utility model, all the refractory bricks constituting the heat-resistant lining are divided into high-position refractory bricks with a thicker radial thickness and low-position refractory bricks with a thinner radial thickness. The high-position refractory bricks are arranged to form spiral protrusions, and spiral grooves are formed between two adjacent spiral protrusions. During the rotation of the kiln, the material to be dried will flow from front to back along the kiln axis under the combined action of its own weight and the spiral grooves, ensuring the fluidity of the material. The drying airflow flows in the spiral grooves, forming an effective counter-current heat exchange with the material. At the same time, when the material is turned over to the high-position refractory bricks, it will form a natural turning, which also helps to improve the heat exchange effect between the material and the drying airflow. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of an embodiment of a rotary kiln with a spiral guide liner according to the present invention.

[0014] Figure 2 for Figure 1 A schematic diagram showing the fit between the kiln body and refractory bricks along the central axis.

[0015] Figure 3 for Figure 2 A schematic diagram showing the combination of high-position refractory bricks and low-position refractory bricks in the middle circumference upwards;

[0016] In the diagram: 1. Air inlet; 2. Spiral groove; 3. Intermediate support; 4. Gear motor; 5. Transmission gear ring; 6. Spiral protrusion; 7. Kiln body; 8. High-position refractory brick; 9. Low-position refractory brick; 10. Feed inlet; 11. Wear-resistant ceramic insert; 12. Outer part; 13. Inner part; 14. Concave-convex positioning structure; 15. Front support; 16. Rear support. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0020] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0021] One specific embodiment of the rotary kiln with a spiral guide lining in this utility model is, for example... Figures 1-3 As shown:

[0022] The system includes a rotary kiln support and a kiln body 7. The rotary kiln support comprises a front support 15, a middle support 3, and a rear support 16 arranged sequentially from front to back. The kiln body 7 extends in an inclined posture, gradually tilting upwards from back to front. The front and rear ends of the kiln body are respectively rotatably mounted on the front support 15 and the rear support 16. A kiln body drive mechanism for driving the kiln body to rotate is provided on the middle support. A transmission gear ring 5 is provided on the outer periphery of the middle part of the kiln body. The kiln body drive mechanism includes a reduction motor 4 mounted on the middle support. The power output end of the reduction motor 4 is provided with a transmission gear that is connected to the transmission gear ring. A feed inlet is provided at the front end (i.e., the high end) of the kiln body, and an air inlet is provided at the rear end (i.e., the low end) of the kiln body. All of the above are existing technologies and will not be described in detail here.

[0023] The interior of the kiln is equipped with a heat-resistant lining made of refractory bricks. Specifically, there are multiple rings of refractory bricks, which are arranged sequentially along the axial direction of the kiln body. The same ring of refractory bricks is spliced ​​sequentially along the circumference of the kiln body. A concave-convex positioning structure 14 is provided between two adjacent refractory bricks in the circumference.

[0024] In this embodiment, all refractory bricks are divided into low-position refractory bricks 9 and high-position refractory bricks 8, which are higher than the low-position refractory bricks. The radial thickness of the high-position refractory bricks 8 is greater than the radial thickness of the low-position refractory bricks 9. Therefore, the refractory bricks with thicker radial thickness are called high-position refractory bricks 8, and the refractory bricks with thinner radial thickness are called low-position refractory bricks 9.

[0025] Each high-level refractory brick is arranged to form a spiral protrusion 6 coaxial with the kiln body. There are at least two spiral protrusions, and each spiral protrusion is spaced apart along the circumference of the kiln body. The low-level refractory bricks are respectively arranged between two adjacent spiral protrusions, and spiral grooves 2 are formed between two adjacent spiral protrusions.

[0026] The high-position refractory brick includes an outer portion 12 with a radial thickness consistent with that of the low-position refractory brick. The high-position refractory brick also includes an inner portion 13 integrally formed with the outer portion and protruding towards the kiln axis. The circumferential width of the inner portion 13 is smaller than that of the outer portion 12. The radial thickness of the outer portion 12 is consistent with that of the low-position refractory brick, and the circumferential width of the inner portion is smaller than that of the outer portion.

[0027] The inner part of the high-position refractory brick is surrounded by a wear-resistant ceramic insert 11. The wear-resistant ceramic insert 11 has a Mohs hardness of ≥9. The use of the wear-resistant ceramic insert improves the wear resistance of the high-position refractory brick, which allows the rotary kiln to be used for drying some materials with high hardness, such as alumina powder. At the same time, it can also prevent metal impurities from being mixed into the alumina powder during the drying process.

[0028] During operation, the material to be dried enters the front end of the kiln body through the feed inlet, while the drying gas enters the kiln body through the air inlet and then flows from back to front and from bottom to top. The kiln drive mechanism drives the kiln body to rotate around its own axis. As the spiral groove rotates, the material to be dried flows towards the lower end of the kiln body. The spiral groove improves the fluidity of the material, making it less likely for local high-temperature zones to form, which would lead to sintering and agglomeration of the kiln lining. At the same time, the drying gas flowing along the spiral groove can fully contact and exchange heat with the material to be dried within the spiral groove. As the material to be dried flows towards the lower end of the kiln body with the rotation of the spiral groove, it will roll over the relatively high spiral protrusions made of high-position refractory bricks. At this time, the spiral protrusions lift the material to be dried, which helps to further improve the uniformity of the material to be dried and fully facilitates the heat exchange with the hot air.

[0029] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A rotary kiln with a spiral flow guide lining, comprising a rotary kiln support, a kiln body rotatably mounted on the rotary kiln support and extending upwards gradually from back to front, a feed inlet at the front end of the kiln body, an air inlet at the rear end of the kiln body, a kiln body drive mechanism for driving the kiln body to rotate on the rotary kiln support, and a heat-resistant lining made of refractory bricks on the inner wall of the kiln body, characterized in that... Each refractory brick includes low-level refractory bricks and high-level refractory bricks with a height higher than the low-level refractory bricks. The high-level refractory bricks are arranged to form a spiral protrusion coaxial with the kiln body. There are at least two spiral protrusions. Each spiral protrusion is spaced apart along the circumference of the kiln body. The low-level refractory bricks form spiral grooves between adjacent spiral protrusions.

2. The rotary kiln according to claim 1, characterized in that: The cross-sectional shape of high-temperature refractory bricks and low-temperature refractory bricks is a rectangular structure with its length extending along the axis of the kiln body.

3. The rotary kiln according to claim 1, characterized in that: A convex-concave positioning structure with a convex-concave fit is provided between two adjacent refractory bricks on the circumference.

4. The rotary kiln according to any one of claims 1 to 3, characterized in that: The high-position refractory brick includes an outer portion with a radial thickness consistent with that of the low-position refractory brick. The high-position refractory brick also includes an inner portion that is integrally formed with the outer portion and protrudes towards the kiln axis. The circumferential width of the inner portion is smaller than that of the outer portion.

5. The rotary kiln according to claim 4, characterized in that: The inner part of the high-position refractory brick is surrounded by wear-resistant ceramic inserts.

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