Lining structure of rotary kiln

Abstract

The utility model provides a lining structure of a rotary kiln, particularly relates to the technical field of smelting equipment, and aims to solve the technical problem that the driving load of the rotary kiln is high due to the fact that an existing lining of the rotary kiln is made of two layers of refractory bricks and is heavy. The kiln comprises a kiln head, a first high-temperature lining area, a material blocking ring, a second high-temperature lining area, a low-temperature lining area and a kiln tail necking opening which are sequentially spliced from left to right, each of the first high-temperature lining area and the second high-temperature lining area is a single-layer cylinder formed by splicing a plurality of composite structure bricks; the low-temperature lining area is a cylinder formed by splicing a plurality of single-layer bricks made of single materials. The single-layer composite structure bricks are adopted in the high-temperature area to replace two-layer single-material bricks adopted in the prior art, and compared with the two-layer single-material bricks, the thickness of the single-layer composite structure bricks is obviously reduced, so that the internal space of the rotary kiln is increased, the weight is reduced, the storage amount of materials in the kiln is effectively increased, and the production cost is reduced. The driving load of the rotary kiln is reduced; and the productivity is improved.

Description

Technical Field

[0001] This utility model relates to the field of smelting equipment technology, and more specifically, to a rotary kiln lining structure. Background Technology

[0002] A rotary kiln is a long, cylindrical, rotatable high-temperature calcining device widely used in metallurgy, chemical industry, building materials, and other industries. Its main body is an inclined steel cylinder. Through slow rotation, the material is heated evenly within the cylinder, while the high temperature generated by fuel combustion completes physical or chemical reactions. In the sulfuric acid process for producing titanium dioxide, a rotary kiln is used to calcine metatitanic acid, removing its water of crystallization and sulfate impurities, transforming it into pure TiO2 crystals.

[0003] However, existing rotary kiln linings are generally made of two layers of refractory bricks, resulting in a large overall weight of the rotary kiln, leading to high drive load and high energy consumption. Secondly, with the filling rate of the rotary kiln shell remaining constant, the double-layer refractory bricks also reduce the reaction space inside the kiln, thus adversely affecting production capacity. Utility Model Content

[0004] The purpose of this utility model is to provide a rotary kiln lining structure that, while ensuring the refractory properties of the composite brick, has a significantly reduced thickness compared to two layers of single-material bricks. This increases the internal space of the rotary kiln, reduces its weight, and effectively increases the material storage capacity inside the kiln, reduces the rotary kiln drive load, and increases production capacity.

[0005] The embodiments of this utility model are achieved through the following technical solutions:

[0006] A rotary kiln lining structure includes, from left to right, a kiln head, a first high-temperature lining zone, a baffle ring, a second high-temperature lining zone, a low-temperature lining zone, and a kiln tail constriction; the first and second high-temperature lining zones are both single-layer cylindrical bodies composed of multiple composite structure bricks; the low-temperature lining zone is a single-layer cylindrical body composed of multiple single-material bricks.

[0007] In some embodiments, the composite structural brick includes a radial wedge-shaped body, the outer surface of which is provided with a mating groove, a wedge-shaped block is installed in the mating groove, and the mating groove is arranged along the tangential direction of the rotary kiln.

[0008] In some embodiments, the radial wedge body is made of high-alumina brick refractory material, and the wedge block is made of lightweight brick material.

[0009] In some embodiments, the single-material brick is made of clay.

[0010] In some embodiments, the kiln head is formed by casting with phosphate castable; the kiln tail constriction is formed by casting with acid-resistant castable.

[0011] In some embodiments, Y-shaped anchor pins are provided in the constricted openings of the kiln head and kiln tail, and the outer ends of the Y-shaped anchor pins are welded to the outer kiln shell.

[0012] In some embodiments, a first metal mesh is fitted around the outside of the kiln head, the first high-temperature lining zone, the baffle ring, the second high-temperature lining zone, the low-temperature lining zone, and the kiln tail constriction.

[0013] In some embodiments, a second metal mesh is also fitted around the outside of the kiln head, the baffle ring, and the kiln tail constriction, with the second metal mesh fitted around the outside of the first metal mesh.

[0014] In some embodiments, a plurality of baffle rings are arranged along the axial direction of the lining on the outer side of the low-temperature lining zone.

[0015] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects:

[0016] 1. The high-temperature zone of the rotary kiln lining uses a single layer of composite structural bricks instead of the two layers of single-material bricks used in the existing technology. While ensuring the fire resistance of the composite structural bricks, their thickness is significantly reduced compared to two layers of single-material bricks, thereby increasing the internal space of the rotary kiln and reducing its weight. This effectively increases the material storage capacity inside the kiln, reduces the driving load of the rotary kiln, and increases its production capacity.

[0017] 2. To ensure that the rotary kiln lining maintains its supporting strength even after its thickness is reduced, Y-shaped anchor bolts are installed in the kiln head and kiln tail constrictions. The outer ends of the Y-shaped anchor bolts are welded to the outer kiln shell, thereby reinforcing the kiln head and kiln tail constrictions.

[0018] 3. This rotary kiln increases the support and fixation between the rotary lining and the kiln shell by attaching a first metal mesh to the outside of the kiln head, the first high-temperature lining zone, the baffle ring, the second high-temperature lining zone, the low-temperature lining zone, and the kiln tail constriction, thereby preventing lining displacement.

[0019] 4. A second metal mesh is added to the outside of vulnerable parts such as the kiln head, baffle ring, and kiln tail constriction to achieve a double-layer metal mesh structure, thereby improving impact resistance. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a rotary kiln lining structure.

[0022] Figure 2 for Figure 1 Structural cross-sectional view of section A in the middle;

[0023] Figure 3 for Figure 1 Structural cross-sectional view of section B in the middle;

[0024] Figure 4 for Figure 1 Structural cross-sectional view of section C in the middle;

[0025] Figure 5 for Figure 1 Structural cross-sectional view of section D;

[0026] Figure 6 This is a schematic diagram of the composite structure brick provided in an embodiment of this utility model.

[0027] Icons: 1. Kiln head; 2. First high-temperature lining zone; 3. Material retaining ring; 4. Second high-temperature lining zone; 5. Low-temperature lining zone; 6. Kiln tail narrowing; 7. Radial wedge-shaped body; 8. Matching groove; 9. Wedge block; 10. Y-shaped anchor nail; 11. First metal mesh; 12. Second metal mesh; 13. Brick retaining ring. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, 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. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] 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.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] Please see Figures 1-6 As shown, the rotary kiln lining structure provided in this embodiment includes, from left to right, a kiln head 1, a first high-temperature lining zone 2, a baffle ring 3, a second high-temperature lining zone 4, a low-temperature lining zone 5, and a kiln tail constriction 6. The first high-temperature lining zone 2 and the second high-temperature lining zone 4 are both single-layer cylindrical bodies composed of multiple composite structural bricks. The low-temperature lining zone 5 is a single-layer cylindrical body composed of multiple single-material bricks. The composite structural brick includes a radial wedge-shaped body 7, the outer surface of which is provided with a mating groove 8, and a wedge-shaped block 9 is installed within the mating groove 8. The mating groove 8 is arranged along the tangential direction of the rotary kiln, so that the wedge-shaped block 9 surrounds the kiln. The radial wedge-shaped body 7 is made of high-alumina refractory material, and the wedge-shaped block 9 is made of lightweight brick material.

[0034] In some embodiments, the single-material brick is made of clay.

[0035] In some embodiments, the kiln head 1 is formed by casting with phosphate castable; the kiln tail constriction 6 is formed by casting with acid-resistant castable. The acid-resistant castable is a prior art material, mainly composed of acid-resistant aggregates and powders, using sodium silicate as a binder and sodium fluorosilicate as a setting accelerator to form a high-performance refractory material.

[0036] In some embodiments, Y-shaped anchor bolts 10 are provided inside both the kiln head 1 and the kiln tail constriction 6, and the outer ends of the Y-shaped anchor bolts 10 are welded to the outer kiln shell. The kiln shell is made of steel plate.

[0037] In some embodiments, a first metal mesh 11 is fitted onto the outer side of the kiln head 1, the first high-temperature lining zone 2, the baffle ring 3, the second high-temperature lining zone 4, the low-temperature lining zone 5, and the kiln tail constriction 6.

[0038] In some embodiments, a second metal mesh 12 is also sleeved on the outside of the kiln head 1, the baffle ring 3, and the kiln tail constriction 6, and the second metal mesh 12 is sleeved on the outside of the first metal mesh 11.

[0039] In some embodiments, a plurality of baffle rings 13 are arranged along the axial direction of the lining on the outer side of the low-temperature lining zone 5.

[0040] In this rotary kiln, the high-temperature zone lining uses a single-layer composite structure brick instead of the two-layer single-material brick used in existing technologies. The composite structure brick includes a radial wedge-shaped body 7, with a mating groove 8 on its outer surface. A wedge-shaped block 9 is installed within the mating groove 8, which is positioned tangentially to the rotary kiln. The radial wedge-shaped body 7 is made of high-alumina refractory material, while the wedge-shaped block 9 is made of lightweight brick. This composite structure, while maintaining the refractory properties of the composite structure brick, significantly reduces its thickness compared to two overlapping layers of single-material refractory bricks. This increases the internal space of the rotary kiln and reduces its weight, effectively increasing the material storage capacity within the kiln, reducing the rotary kiln drive load, and increasing production capacity.

[0041] In addition, to ensure that the rotary kiln lining maintains its supporting strength even after the thickness is reduced, Y-shaped anchor bolts 10 are provided inside both the kiln head 1 and the kiln tail constriction 6. The outer ends of the Y-shaped anchor bolts 10 are welded to the outer kiln shell. This reinforces the kiln head 1 and the kiln tail constriction 6.

[0042] Furthermore, by attaching a first metal mesh 11 to the outside of the kiln head 1, the first high-temperature lining zone 2, the baffle ring 3, the second high-temperature lining zone 4, the low-temperature lining zone 5, and the kiln tail constriction 6, the supporting force and fixing effect between the rotating lining and the kiln shell are increased, preventing lining displacement. Additionally, a second metal mesh 12 is added to the outside of vulnerable areas such as the kiln head 1, the baffle ring 3, and the kiln tail constriction 6, creating a double-layer metal mesh structure to enhance impact resistance.

[0043] It is worth mentioning that for a rotary kiln with dimensions of φ4×80m, replacing the original lining structure with this new lining structure increases the volume by 45 cubic meters, meaning the volume of refractory bricks is reduced by 45 cubic meters. The density of the refractory bricks is 2.3 g / cm³. 3This reduces the weight of the rotary kiln by approximately 100 tons, thereby lowering the drive load. Calculations show an increase in capacity of approximately 0.45 tons per hour, compared to the existing 11 tons per hour, representing a 4% increase in capacity after the improvement.

[0044] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A rotary kiln lining structure, characterized in that, The system includes, from left to right, a kiln head (1), a first high-temperature lining zone (2), a baffle ring (3), a second high-temperature lining zone (4), a low-temperature lining zone (5), and a kiln tail constriction (6); the first high-temperature lining zone (2) and the second high-temperature lining zone (4) are both single-layer cylinders composed of multiple composite structure bricks; the low-temperature lining zone (5) is a single-layer cylinder composed of multiple single-material bricks; the composite structure bricks include a radial wedge-shaped body (7), the outer side of the radial wedge-shaped body (7) is provided with a matching groove (8), a wedge block (9) is installed in the matching groove (8), and the matching groove (8) is set along the tangential direction of the rotary kiln; the radial wedge-shaped body (7) is made of high-alumina brick refractory material, and the wedge block (9) is made of lightweight brick material.

2. The rotary kiln lining structure according to claim 1, characterized in that, The single-material brick is made of clay.

3. The rotary kiln lining structure according to claim 1, characterized in that, The kiln head (1) is formed by casting with phosphate castable; the kiln tail constriction (6) is formed by casting with acid-resistant castable.

4. The rotary kiln lining structure according to claim 3, characterized in that, Both the kiln head (1) and the kiln tail constriction (6) are provided with Y-shaped anchor nails (10), and the outer end of the Y-shaped anchor nails (10) is welded to the outer kiln shell.

5. The rotary kiln lining structure according to claim 1, characterized in that, A first metal mesh (11) is fitted around the outside of the kiln head (1), the first high-temperature lining zone (2), the baffle ring (3), the second high-temperature lining zone (4), the low-temperature lining zone (5), and the kiln tail constriction (6).

6. The rotary kiln lining structure according to claim 5, characterized in that, A second metal mesh (12) is also fitted on the outside of the kiln head (1), the baffle ring (3), and the kiln tail constriction (6), and the second metal mesh (12) is fitted on the outside of the first metal mesh (11).

7. The rotary kiln lining structure according to claim 1, characterized in that, Multiple baffle rings (13) are arranged along the axial direction of the lining on the outer side of the low-temperature lining zone (5).

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