Rotary kiln additionally provided with embedded cross shoveling plate

What is AI technical title?
AI technical title is built by Patsnap AI team. It summarizes the technical point description of the patent document.
By designing an embedded cross-type plate structure in the rotary kiln, the disturbance and partition heating of the particle bed are improved, and the problem of insufficient heat transfer effect of traditional rotary kilns is solved, and the heating efficiency is significantly improved.

CN222317646UActive Publication Date: 2025-01-07SOUTHEAST UNIV

View PDF -1 Cites 0 Cited by

Patent Information

Application Number: CN202420953095.8
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-05-06
Publication Date: 2025-01-07
Estimated Expiration: 2034-05-06

AI Technical Summary

Technical Problem

When traditional cylindrical rotary kilns are used in the industry to heat particulate materials, the heat transfer effect is limited by size and cannot meet industrial needs. There is an upper limit to the promotion effect of traditional plate-brushing devices on the system's heat transfer.

Method used

Design a rotary kiln equipped with an embedded cross-type copy board, including a cylinder, an end cover, a rotating shaft, a plurality of intermediate copy boards, a first end copy board and a second end copy board, and the intermediate copy board is in the axial direction, etc. The spacing is set, and the first and second end plates and the middle plates are in a central symmetrical structure, and the disturbance and partition heating of the particle bed are enhanced through multiple plate bodies to improve heat transfer efficiency.

Benefits of technology

The materials are lifted by the intermediate plate, which promotes particle mixing and partition heating, which significantly improves the heat transfer efficiency of the rotary kiln, and improves the mixing effect through the two ends, further accelerating the heat transfer effect.

✦ Generated by Eureka AI based on patent content.

Smart Images

Figure CN222317646U_ABST

Patent Text Reader

Abstract

The rotary kiln comprises a cylinder body, an end cover, a rotating shaft, a plurality of middle shoveling plates, a first end shoveling plate and a second end shoveling plate, one end of the cylinder body is a closed end, the first end shoveling plate is arranged on the inner side of the cylinder body, a first shaft hole coaxial with the first end shoveling plate is formed in the center of the closed end, and a second shaft hole coaxial with the second end shoveling plate is formed in the center of the second end shoveling plate. The other end of the barrel is an open end and is sealed by the end cover, the second end shoveling plate is arranged on the inner side of the end cover, and a second shaft hole coaxial with the second end shoveling plate is formed in the center of the end cover; the rotating shaft and the cylinder body are coaxially arranged, and the two ends of the rotating shaft penetrate through the first shaft hole and the second shaft hole respectively and are matched with the cylinder body and the end cover through bearings; the middle shoveling plates are arranged on the rotating shaft at equal intervals in the axial direction, and the middle shoveling plates, the first end shoveling plate and the second end shoveling plate are of a central symmetry structure and comprise a plurality of plate bodies evenly arranged in the circumferential direction. The heat transfer effect of the rotary kiln is greatly improved.

Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model relates to the technical field of rotary kiln heating, in particular to a rotary kiln equipped with an embedded cross-shaped copying plate. Background Art

[0002] The rotary kiln is a widely used thermal processing equipment in industry. Among them, the externally heated rotary kiln is suitable for heating or cooling granular materials in large circulating fluidized bed (CFB) systems due to its advantages of stable operation and easy temperature control. However, due to the complexity and diversity of working conditions, the traditional cylindrical rotary kiln can no longer meet industrial needs, so various rotary kilns with built-in lifting plates are very popular. Common lifting plate devices are divided into uniform distribution type and lifting type. One end of these two lifting plates is fixed on the wall of the kiln body. When working, they are mainly responsible for lifting the granular materials and then throwing the particles to the free surface of the particle bed, so that the materials can be loosened and fully exchanged with the air medium, thereby promoting the heating process of the particles by the rotary kiln system. However, after many improvements on these two types of lifting plates, the researchers found that due to size limitations, there is an upper limit to the effect of these two types of lifting plates on the promotion of system heat transfer, which is obviously not conducive to industrial heating of large amounts of granular materials. Utility Model Content

[0003] In view of the shortcomings of the prior art, the utility model provides a rotary kiln equipped with an embedded cross-shaped copying plate, aiming at improving the heat transfer effect of the rotary kiln.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A rotary kiln equipped with an embedded cross-shaped shovel, comprising a cylinder, an end cover, a rotating shaft, a plurality of intermediate shovels, a first end shovel and a second end shovel, wherein one end of the cylinder is a closed end, the inner side of which is provided with the first end shovel, the center of which is provided with a first axial hole coaxial with the first end shovel, the other end of the cylinder is an open end, which is closed by the end cover, the inner side of which is provided with the second end shovel, the center of which is provided with a second axial hole coaxial with the second end shovel;

[0006] The rotating shaft is coaxially arranged with the cylinder, and the two ends of the rotating shaft are respectively inserted into the first shaft hole and the second shaft hole, and are matched with the cylinder and the end cover through bearings;

[0007] The plurality of intermediate copying plates are arranged on the rotating shaft at equal intervals along the axial direction. The intermediate copying plates, the first end copying plates and the second end copying plates are all centrally symmetrical structures, including a plurality of plate bodies uniformly arranged along the circumferential direction.

[0008] Further technical solutions are:

[0009] The number of the plurality of intermediate copying plates is N, and two adjacent intermediate copying plates along the axial direction form an angle α along the circumferential direction, where α=360° / 2N.

[0010] The axial spacing between the first end copying plate, the second end copying plate and the nearest intermediate copying plate, and the axial spacing between two adjacent intermediate copying plates are the same, and the ratio of the axial spacing to the plate thickness is 4.

[0011] The lengths of several plates of each copying plate are the same, and the ratio of the length of the plate to the inner diameter of the cylinder is 0.35, and the ratio of the thickness of the plate to the inner diameter of the cylinder is 0.1.

[0012] A rounded corner is arranged between two adjacent plate bodies of each copying plate.

[0013] The ratio of the diameter of the first axial hole and the second axial hole to the inner diameter of the cylinder is 0.1.

[0014] A sealing ring is arranged between the cylinder and the end cover.

[0015] The middle copy plate is provided with a center hole for the rotating shaft to pass through, and a gasket is provided between the center hole and the rotating shaft.

[0016] The middle copying plate, the first end copying plate and the second end copying plate are all provided with eight plate bodies.

[0017] The ratio of the outer diameter to the inner diameter of the cylinder is 1.1.

[0018] The beneficial effects of the utility model are as follows:

[0019] The utility model mainly lifts the material particles in the rotary kiln through the middle lifting plate, so that the particle bed is violently disturbed to promote particle mixing, and on the other hand, the particle bed is heated in different areas, further improving the heat transfer efficiency of the rotary kiln. At the same time, the lifting plates at both ends enhance the mixing effect of the end materials, further accelerating the heat transfer effect of the rotary kiln system.

[0020] Other features and advantages of the present invention will be set forth in the following description, and in part will become apparent from the description, or may be understood by practicing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a perspective diagram of the three-dimensional structure of an embodiment of the utility model.

[0022] Figure 2 It is a perspective view of the main viewing angle of an embodiment of the utility model.

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure of the cylinder of an embodiment of the utility model.

[0024] Figure 4 It is a schematic diagram of the main cross-sectional view of the cylinder body of an embodiment of the utility model.

[0025] Figure 5 This is a schematic diagram of the end cover structure of an embodiment of the utility model.

[0026] Figure 6 It is a schematic diagram of the structure of the intermediate copying plate of an embodiment of the utility model.

[0027] Figure 7 It is a schematic diagram of the temperature simulation effect of a rotary kiln with different numbers of plate bodies installed in an embodiment of the utility model.

[0028] Figure 8 This is a graph showing average temperature variation of rotary kilns with various numbers of plate bodies installed in accordance with an embodiment of the present invention.

[0029] In the figure: 1, cylinder; 2, middle copy plate; 3, end cover; 4, gasket; 5, rotating shaft; 6, bearing; 7, base; 8, first end copy plate; 9, sealing ring; 10, first shaft hole; 11, second end copy plate; 12, fillet; 13, second shaft hole; 14, center hole; 100, plate body. DETAILED DESCRIPTION

[0030] The specific implementation of the utility model is described below in conjunction with the accompanying drawings.

[0031] like Figures 1 to 5 As shown, the rotary kiln with an embedded cross-shaped shovel plate in this embodiment comprises a cylinder 1, an end cover 3, a rotating shaft 5, a plurality of intermediate shovel plates 2, a first end shovel plate 8 and a second end shovel plate 11. One end of the cylinder 1 is a closed end, and a first end shovel plate 8 is arranged inside the cylinder 1. A first axial hole 10 coaxial with the first end shovel plate 8 is arranged at the center of the closed end. The other end of the cylinder 1 is an open end, which is closed by the end cover 3. A second end shovel plate 11 is arranged inside the end cover 3. A second axial hole 13 coaxial with the second end shovel plate 11 is arranged at the center of the end cover 3.

[0032] The rotating shaft 5 is coaxially arranged with the cylinder 1, and the two ends of the rotating shaft 5 are respectively passed through the first shaft hole 10 and the second shaft hole 13, and matched with the cylinder 1 and the end cover 3 through the bearing 6;

[0033] A plurality of intermediate copying plates 2 are equidistantly arranged on the rotating shaft 5 along the axial direction. The intermediate copying plates 2, the first end copying plates 8 and the second end copying plates 11 are all centrally symmetrical structures, including a plurality of plate bodies 100 uniformly arranged along the circumferential direction.

[0034] Specifically, the center of the closed end of the cylinder 1 is provided with a first end copying plate 8 by machining. The first end copying plate 8, the second end copying plate 11 and the middle copying plate 2 of this embodiment have the same structural dimensions.

[0035] Specifically, the end cover 3 is assembled with the cylinder body 1 through a sealing ring, and the end cover 3 is machined to form a second end copy plate 11 at the center of one side.

[0036] Specifically, the thickness (dimensions in the axial direction) of each intermediate copy plate 2 is consistent, and can be formed by aluminum extrusion processing. Specifically, medium-high strength aluminum alloys such as aluminum alloy 6061 or 6063 can be used. The processing method has low cost and simple assembly method, which is convenient for large-scale batch production.

[0037] Specifically, a sealing ring 9 is provided between the cylinder 1 and the end cover 3 .

[0038] Specifically, the ratio of the diameter of the rotating shaft 5 to the inner diameter of the cylinder 1 is set to 0.1. Specifically, a high-strength rotating shaft material such as GCR-15 is used.

[0039] Specifically, the cylinder 1 can be fixed or driven by a driving mechanism to rotate. The bottom of the fixed cylinder 1 is provided with a base 7 such as Figure 2 shown.

[0040] Preferably, the number of the plate bodies 100 of the plurality of intermediate copying plates 2 is N, and two adjacent intermediate copying plates 2 along the axial direction form an angle α along the circumferential direction, where α=360° / 2N.

[0041] like Figure 6 As shown, the lengths of the plates 100 of each lifting plate are the same, and the ratio of the length of the plate 100 to the inner diameter of the cylinder 1 is 0.35, the ratio of the thickness of the plate 100 to the inner diameter of the cylinder 1 is 0.1, and the draft angle of the plate 100 is set to 1.5 degrees. In order to facilitate the lifting and mixing heat transfer of the granular material, a fillet 12 with a radius of 5 mm is provided between two adjacent plates 100 of each lifting plate.

[0042] In order to reduce the deterioration of the heating effect caused by the axial segregation of particles, the axial spacing between the first end copying plate 8, the second end copying plate 11 and the nearest intermediate copying plate 2, and the axial spacing between two adjacent intermediate copying plates 2 in this embodiment are the same, and the ratio of the axial spacing to the thickness of the plate body 100 is 4, thereby effectively avoiding the influence of particle segregation, effectively promoting heat transfer and saving manufacturing materials.

[0043] The ratio of the diameter of the first axial hole 10 and the second axial hole 13 to the inner diameter of the cylinder 1 is 0.1.

[0044] In order to facilitate installation of the heating module on the wall of the cylinder 1 , the ratio of the outer diameter to the inner diameter of the cylinder 1 is 1.1.

[0045] Specifically, the middle lifting plate 2 is provided with a center hole 14 for the rotating shaft 5 to pass through, and a gasket 4 is provided between the center hole 14 and the rotating shaft 5. The ratio of the thickness (dimension in the radial direction) of the gasket 4 to the inner diameter of the cylinder 1 is set to 0.02. This reduces the friction between the contact surfaces of different structures. Specifically, standard gasket materials such as 65Mn spring steel can be used.

[0046] LS-DYNA was used for simulation analysis, and the optimal number of plates was obtained by comparing the average temperature of the particle bed. In the simulation, the number of plates was set to 4, 6 and 8, and the particle filling rate was set to 25%. The simulation results of different numbers of plates are shown in Figure 2. Figure 7 and Figure 8 As shown. Through simulation, it can be seen that when the number of plates is 8, the particle bed temperature rises fastest and the heat transfer effect is the best. When the number of copying plates exceeds 8, further increasing the copying plates will not significantly improve the heat transfer efficiency, but will increase the friction resistance during the rotation process and increase consumables. Therefore, the number of plates is set to 8 in this embodiment.

[0047] When the rotary kiln of this embodiment is in operation, a heating module is arranged in the cylinder 1, and the rotating shaft 5 is driven by an external driving device (not shown in the figure), thereby rotating relative to the cylinder 1. The middle scraper plate 2 rotates with the rotating shaft 5, while the second end scraper plate 11 arranged on the end cover 3 and the first end scraper plate 8 arranged at the closed end of the cylinder 1 do not rotate with the rotating shaft 5. The heat transfer effect of the material at the end can be effectively improved.

[0048] Those skilled in the art can understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rotary kiln equipped with an embedded cross-shaped copy board, characterized in that: The invention comprises a cylinder (1), an end cover (3), a rotating shaft (5), a plurality of intermediate copying plates (2), a first end copying plate (8) and a second end copying plate (11); one end of the cylinder (1) is a closed end, the inner side of which is provided with the first end copying plate (8); the center of the closed end is provided with a first axial hole (10) coaxial with the first end copying plate (8); the other end of the cylinder (1) is an open end, which is closed by the end cover (3); the inner side of the end cover (3) is provided with the second end copying plate (11); the center of the end cover (3) is provided with a second axial hole (13) coaxial with the second end copying plate (11); The rotating shaft (5) is coaxially arranged with the cylinder (1), and the two ends of the rotating shaft (5) are respectively inserted into the first shaft hole (10) and the second shaft hole (13), and are matched with the cylinder (1) and the end cover (3) through the bearing (6); The plurality of intermediate copying plates (2) are arranged on the rotating shaft (5) at equal intervals along the axial direction. The intermediate copying plates (2), the first end copying plates (8) and the second end copying plates (11) are all centrally symmetrical structures, including a plurality of plate bodies (100) uniformly arranged along the circumferential direction.

2. The rotary kiln equipped with an embedded cross-shaped copy board according to claim 1, characterized in that: The number of plate bodies (100) of the plurality of intermediate copying plates (2) is N, and two adjacent intermediate copying plates (2) along the axial direction form an angle α along the circumferential direction, where α=360° / 2N.

3. The rotary kiln equipped with an embedded cross-shaped copy board according to claim 1, characterized in that: The axial spacing between the first end copying plate (8), the second end copying plate (11) and the nearest intermediate copying plate (2), and the axial spacing between two adjacent intermediate copying plates (2) are the same, and the ratio of the axial spacing to the thickness of the plate body (100) is 4.

4. The rotary kiln equipped with an embedded cross-shaped scraper according to claim 1, characterized in that: The lengths of the plurality of plate bodies (100) of each copying plate are the same, and the ratio of the length of the plate body (100) to the inner diameter of the cylinder (1) is 0.35, and the ratio of the thickness of the plate body (100) to the inner diameter of the cylinder (1) is 0.

1.

5. The rotary kiln equipped with an embedded cross-shaped scraper according to claim 1, characterized in that: A rounded corner (12) is provided between two adjacent plate bodies (100) of each copying plate.

6. The rotary kiln equipped with an embedded cross-shaped scraper according to claim 1, characterized in that: The ratio of the diameter of the first axial hole (10) and the second axial hole (13) to the inner diameter of the cylinder (1) is 0.

1.

7. The rotary kiln equipped with an embedded cross-shaped lifting plate according to claim 1, characterized in that: A sealing ring (9) is provided between the cylinder (1) and the end cover (3).

8. The rotary kiln equipped with an embedded cross-shaped scraper according to claim 1, characterized in that: The middle lifting plate (2) is provided with a center hole (14) for the rotating shaft (5) to pass through, and a gasket (4) is provided between the center hole (14) and the rotating shaft (5).

9. The rotary kiln equipped with an embedded cross-shaped scraper according to claim 1, characterized in that: The middle copying plate (2), the first end copying plate (8) and the second end copying plate (11) are each provided with eight plate bodies (100).

10. The rotary kiln equipped with an embedded cross-shaped lifting plate according to claim 1, characterized in that: The ratio of the outer diameter to the inner diameter of the cylinder (1) is 1.1.