Lining structure and rotary furnace comprising same

Abstract

The utility model discloses a lining structure and a rotary furnace comprising the same, the lining structure comprises at least three lining plates, and the lining plates are sequentially spliced to enable the cross section of the lining structure to be polygonal; the lining plate comprises a plurality of silicon carbide plates, the lining plate at least comprises two silicon carbide plates in the width direction, and the adjacent silicon carbide plates are arranged in a staggered mode. The rotary furnace comprises a furnace tube, a supporting plate and a lining structure. The supporting plate is arranged on the inner wall of the furnace tube and connected to the lining structure. The lining structure is made of the silicon carbide plate, so that the problems of material pollution and furnace body erosion caused by reaction of materials and the lining plate are solved.

Description

Technical Field

[0001] This utility model belongs to the field of rotary kiln technology, specifically relating to an inner lining structure and a rotary kiln including the inner lining structure. Background Technology

[0002] A rotary kiln is a thermal equipment used for calcining, roasting, or drying materials of various particle sizes and powders. Its cylinder is mostly made of steel plates and lined with refractory materials to give it high-temperature resistance. Inside the rotary kiln cylinder, which has a polygonal cross-section, the interior is composed of multi-faceted inner lining plates forming a polygonal structure.

[0003] Currently, the metal liners used in traditional applications are mostly made of stainless steel. When materials are in contact with the furnace body for a long time, they are prone to corrosion. Even when using specialized materials such as stainless steel SUS310S and nickel-based alloy Inconel 601, it is still impossible to avoid the reaction between trace amounts of reactive metal elements such as zinc and copper in the metal materials and the materials, resulting in material contamination and corrosion of the metal furnace body.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this utility model is to provide an inner lining structure and a rotary kiln including the inner lining structure. The inner lining structure is made of silicon carbide plate, which solves the problem of material reaction with the inner lining plate leading to material contamination and furnace erosion.

[0006] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:

[0007] A lining structure includes at least three lining plates, which are sequentially spliced ​​together to make the cross-section of the lining structure polygonal.

[0008] The inner lining plate includes a plurality of silicon carbide plates, and the inner lining plate includes at least two silicon carbide plates in the width direction, with adjacent silicon carbide plates being staggered.

[0009] In one or more embodiments of the present invention, the silicon carbide plate has steps on at least two adjacent sides, and adjacent silicon carbide plates in the same inner lining plate are connected to each other by the steps.

[0010] In one or more embodiments of the present invention, two adjacent inner lining plates are provided, with the side of one inner lining plate attached to the other inner lining plate.

[0011] In one or more embodiments of the present invention, two adjacent inner lining plates are provided, wherein the side of one inner lining plate is beveled to fit onto the other inner lining plate.

[0012] In one or more embodiments of this utility model, the lining structure is hexagonal.

[0013] In one or more embodiments of this utility model, the inner lining plate includes 2 to 4 silicon carbide plates in the width direction.

[0014] In one or more embodiments of this utility model, the lining structure is octagonal.

[0015] The technical solution provided by another specific embodiment of this utility model is as follows:

[0016] A rotary kiln includes a furnace tube, a support plate, and the aforementioned inner lining structure;

[0017] The support plate is located on the inner wall of the furnace tube and is connected to the inner lining structure.

[0018] In one or more embodiments of this utility model, the support plate and the silicon carbide plate are connected by bolts, and the bolts are silicon carbide bolts.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The inner lining structure of this utility model is composed of several silicon carbide plates. When installing the inner lining structure in the furnace tube, silicon carbide bolts are also used for installation, replacing the existing stainless steel SUS310S or nickel-based alloy Inconel601 lining plates, reducing the possibility of material reaction with the material, which could lead to material contamination and furnace body erosion.

[0021] 2. The silicon carbide plates are arranged in an alternating pattern. Even after expansion and gaps appear, the smaller gaps can still block the material, reducing the possibility of the material passing through the gaps and contacting the furnace body, thus causing the furnace body to be corroded.

[0022] 3. The inner lining structure is bolted, which facilitates installation, disassembly and daily maintenance, without the need to completely disassemble the furnace tubes. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1This is a schematic diagram of the inner lining structure in Embodiment 1 of this utility model;

[0025] Figure 2 This is a schematic diagram of the furnace tube structure in Embodiment 2 of this utility model;

[0026] Figure 3 This is a cross-sectional view of the furnace tube in Embodiment 2 of this utility model;

[0027] Figure 4 This is a cross-sectional view of the furnace tube in Embodiment 2 of this utility model;

[0028] Figure 5 for Figure 4 Enlarged view of part A in the middle.

[0029] Explanation of key figure labels:

[0030] 1. First inner lining plate; 11. Silicon carbide plate; 12. Step; 13. Inclined surface; 14. Bolt; 2. Second inner lining plate; 21. Leaving surface; 3. Furnace tube; 31. Support plate; 4. Roller ring; 5. Sprocket. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0032] Example 1

[0033] like Figure 1 As shown, in one embodiment of this utility model, the inner lining structure includes six inner lining plates, which are spliced ​​together to form a hexagonal cross-section. The six inner lining plates are divided into a first inner lining plate 1 and a second inner lining plate 2. The side of the first inner lining plate 1 is attached to the surface of the second inner lining plate 2 to form a cavity in the middle of the inner lining structure.

[0034] Each inner lining plate is composed of several silicon carbide plates 11. Silicon carbide has good chemical stability and is not prone to reacting with materials at high temperatures, which reduces the possibility of material contamination due to reaction with the inner lining plate. In the inner lining plate, the silicon carbide plates 11 are arranged in two columns and several rows, such that each inner lining plate includes two silicon carbide plates 11 in the width direction. The silicon carbide plates 11 constituting the first inner lining plate 1 have steps 12 on three of their four sides, and a slope 13 on the remaining side. When splicing the first inner lining plate 1, adjacent silicon carbide plates 11 overlap each other via the steps 12, and the slope 13 adheres to the second inner lining plate 2.

[0035] The silicon carbide plate 11 that makes up the second inner lining plate 2 has steps 12 on three of its four sides, and the other side is straight. Of course, in other embodiments, the other side can also be inclined. When splicing the second inner lining plate 2, two adjacent silicon carbide plates 11 overlap each other through the steps 12. The right angle of the straight side of the silicon carbide plate 11 has an inclined relief surface 21. When the inner lining structure is installed in the rotary kiln, the relief surface 21 can reduce the possibility of the edges of the silicon carbide plate 11 scratching the inner wall of the rotary kiln.

[0036] Example 2

[0037] like Figure 2 As shown, in one embodiment of the present invention, the rotary kiln includes a furnace tube 3, and a rolling ring 4 and a sprocket 5 are provided on the outer wall of the furnace tube 3 so as to facilitate the installation of the furnace tube 3 on the frame and its rotation under the drive of external force.

[0038] like Figures 3-5 As shown, several support plates 31 are provided on the inner wall of the furnace tube 3, and the support plates 31 are connected together to the lining structure in Embodiment 1. For ease of installation, the silicon carbide plate 11 has mounting holes. The support plates 31 and the silicon carbide plate 11 are connected by bolts 14 inserted into the mounting holes, allowing the lining structure to be fixed inside the furnace tube 3. The bolts 14 are silicon carbide bolts 14. To prevent powder from falling into the bolt 14 holes and the mounting holes, after the bolts 14 are installed, high-temperature resistant ceramic adhesive is used to fill the holes, ensuring a smooth surface on the silicon carbide plate 11.

[0039] In this utility model, the inner lining structure is spliced ​​from silicon carbide plates 11. When the inner lining structure is installed on the furnace tube 3, it is also installed using bolts 14 made of silicon carbide material. The advantage of this is that by selecting silicon carbide plates to prepare the inner lining structure, the excellent chemical stability of silicon carbide is used to reduce the possibility of the material reacting with the inner lining plate, thereby causing the material to be contaminated and the furnace body to be corroded.

[0040] In addition, furnace tube 3 is made of stainless steel, and the coefficient of thermal expansion of stainless steel is approximately 1.8*10. -6 At ℃, the coefficient of thermal expansion of silicon carbide is approximately 3.6*10. -6At high temperatures (e.g., 850℃), the stainless steel furnace tube 3 expands radially and axially during operation of the rotary kiln. This expansion causes the silicon carbide plates 11 to move, potentially creating gaps between adjacent silicon carbide plates 11. In this situation, the silicon carbide plates 11 also undergo thermal expansion, which can, to some extent, compensate for the gaps caused by the expansion of the furnace tube 3. Combined, even if gaps appear, they are small, making it difficult for powder to pass through and contact the metal furnace tube 3, thus reducing the possibility of corrosion of the furnace tube 3.

[0041] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A lining structure, characterized in that, It includes at least three inner lining plates, which are sequentially spliced ​​together to make the cross-section of the inner lining structure polygonal; The inner lining plate includes a plurality of silicon carbide plates, and the inner lining plate includes at least two silicon carbide plates in the width direction, with adjacent silicon carbide plates being staggered.

2. The lining structure according to claim 1, characterized in that, The silicon carbide plate has steps on at least two adjacent sides, and adjacent silicon carbide plates in the same inner lining plate are connected to each other by the steps.

3. The lining structure according to claim 1, characterized in that, Two adjacent lining panels, with the side of one lining panel attached to the other lining panel.

4. The lining structure according to claim 3, characterized in that, Two adjacent inner lining panels, one of which has a beveled side to fit onto the other inner lining panel.

5. The lining structure according to claim 1, characterized in that, The inner lining structure is hexagonal.

6. The lining structure according to claim 5, characterized in that, The inner lining plate includes 2 to 4 silicon carbide plates in the width direction.

7. The lining structure according to claim 1, characterized in that, The inner lining structure is octagonal.

8. A rotary kiln, characterized in that, Includes furnace tubes, support plates, and the lining structure as described in any one of claims 1-6; The support plate is located on the inner wall of the furnace tube and is connected to the inner lining structure.

9. The rotary kiln according to claim 8, characterized in that, The support plate and the silicon carbide plate are connected by bolts, which are silicon carbide bolts.

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