A rotary kiln lining structure

Abstract

This utility model relates to a rotary kiln lining structure; each ring of the inner lining layer is provided with at least four evenly distributed lifting bricks, the inner surface of which protrudes from the inner surface of the microporous energy-saving inner lining brick. The lifting bricks on each ring of the inner lining layer are positioned one brick in the direction of rotary kiln operation, and form a corrugated spiral protrusion structure for tipping, lifting, and pushing materials. This improves the heat energy conversion rate, thereby improving the quality stability of the rotary kiln, increasing output, saving energy and reducing consumption, and achieving significant environmental protection effects, ultimately achieving the goal of a low-carbon economy.

Description

Technical Field

[0001] This utility model relates to the field of refractory materials technology, specifically to a rotary kiln lining structure. Background Technology

[0002] With increasing pressure from national energy conservation, emission reduction, and environmental protection requirements, and the deepening of the carbon economy, industrial rotary kilns, characterized by high energy consumption, high emissions, and high pollution, have been designated by the state as a key high-temperature energy-consuming kiln industry for industrial energy conservation. To address this, industrial rotary kilns have adopted two measures to reduce energy consumption, decrease harmful gas emissions, protect the environment, and achieve low-carbon economic standards: first, energy-saving measures for kiln lining insulation; and second, controlling the heat exchange efficiency between high-temperature flue gas and the calcined materials during high-temperature calcination. Currently, industrial rotary kiln linings generally use high-density bricks and lightweight composite insulating bricks, but their energy-saving effect is not ideal, and their service life cannot be guaranteed. Furthermore, there has been no technological breakthrough in improving the heat exchange efficiency between flue gas and the calcined materials during high-temperature calcination.

[0003] Rotary kilns are classified according to the different materials they calcine: cement rotary kilns, lime rotary kilns, alumina rotary kilns, nickel-iron rotary kilns, chemical rotary kilns, and other industrial rotary kilns. Because existing industrial rotary kilns have limited material distribution area during kiln operation, the material's efficiency in absorbing heat from the flue gas is low, and the heat absorption is uneven, directly affecting the quality and yield of the calcined material. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model provides a rotary kiln lining structure that can effectively improve the heat absorption efficiency of the kiln body during calcination, make the heat absorption of the calcined material more uniform, thereby improving the quality and yield of the calcined material products, and is energy-saving and environmentally friendly, thus overcoming the defects in existing technologies.

[0005] The technical solution of this utility model is implemented as follows: A rotary kiln lining structure includes an inner lining layer composed of several ring-shaped structures made of microporous energy-saving inner lining bricks, which are arranged on the inner wall of the kiln. Each ring of the inner lining layer is provided with at least four equally distributed lifting bricks. The inner side of the lifting bricks protrudes from the inner side of the microporous energy-saving inner lining bricks. The lifting bricks arranged on each ring of the inner lining layer are positioned one brick in the direction of rotary kiln operation, and they form a corrugated spiral protrusion structure for turning, lifting and pushing materials.

[0006] The lifting bricks and the microporous energy-saving lining bricks are fixedly connected by an adhesive. Each lifting brick and the microporous energy-saving lining brick are set facing the axis of the kiln body. The wedge angles on both sides of the lifting brick and the microporous energy-saving lining brick are equal. The widths of the lifting brick and the microporous energy-saving lining brick are equal, or the width of the lifting brick is a multiple of the width of the microporous energy-saving lining brick.

[0007] A reinforcing steel plate is fixedly installed between the adjacent microporous energy-saving lining bricks on the outer side of the lifting brick.

[0008] The height of the middle of the lifting brick is not lower than the height of the two sides, and the height of the two sides of the lifting brick is not lower than the height of the inner side of the inner lining layer.

[0009] The lifting brick includes a microporous energy-saving central brick body, and at least one microporous energy-saving protective brick is provided on both sides of the microporous energy-saving central brick body. The top surface height of the microporous energy-saving central brick body is not lower than the top surface height of the microporous energy-saving protective brick.

[0010] The lifting brick includes a microporous energy-saving central brick body and a microporous energy-saving protective brick body that is integrally formed with the microporous energy-saving central brick body. The top surface height of the microporous energy-saving central brick body is not lower than the top surface height of the microporous energy-saving protective brick body.

[0011] The microporous energy-saving central brick and the microporous energy-saving protective brick are fixedly connected by an adhesive. This invention has the following positive effects:

[0012] 1. The height of the microporous energy-saving center brick of this utility model is not lower than the top surface height of the microporous energy-saving protective brick, forming a structure that is high in the middle and low on both sides. When using this brick to turn, lift, and push materials in the rotary kiln, the lifting brick structure forms a triangular structure, which is stable and strong, thus extending its service life.

[0013] 2. The rotary kiln lining structure of this utility model, due to the design of a corrugated spiral protruding material turning, lifting, and pushing structure, can turn the calcined material from the bottom of the kiln lining, lift it from the bottom to the top, and push it from the bottom to the top, so that the calcined material can fully absorb the high-temperature flue gas. This allows the calcined material to fully and evenly absorb heat, greatly improving the heat energy conversion rate, thereby improving the quality stability of the rotary kiln, increasing output, saving energy and reducing consumption, and achieving significant environmental protection effects, ultimately achieving the goal of a low-carbon economy. Attached Figure Description

[0014] Figure 1 This is one of the three-dimensional structural diagrams of the material lifting brick of this utility model.

[0015] Figure 2 This is a partial sectional view of the kiln body of this utility model.

[0016] Figure 3 This is a schematic diagram of the overall structure of the kiln lining of this utility model.

[0017] Figure 4 This is a schematic diagram of the main structure of the kiln body of this utility model.

[0018] Figure 5This is the second three-dimensional structural diagram of the material-lifting brick of this utility model. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] In the following description of the invention, it should be noted that the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention 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. The term "connection" only indicates the connection between devices and has no special meaning.

[0021] like Figure 1-5 As shown, a rotary kiln lining structure includes an inner lining layer 2 consisting of several ring-shaped structures made of microporous energy-saving lining bricks, which are disposed on the inner wall of the kiln body 1. Each ring of the inner lining layer 2 is provided with at least four evenly distributed lifting bricks. The inner surface of the lifting bricks protrudes from the inner surface of the microporous energy-saving lining bricks. The lifting bricks on each ring of the inner lining layer 2 are positioned one brick in the direction of rotary kiln operation, and they form a corrugated spiral protrusion structure for turning, lifting, and pushing materials.

[0022] The lifting bricks and the microporous energy-saving lining bricks are fixedly connected by an adhesive. Each lifting brick and microporous energy-saving lining brick is oriented towards the kiln body axis. The wedge angles on both sides of the lifting brick and the microporous energy-saving lining brick are equal, and the widths of the lifting brick and the microporous energy-saving lining brick are equal, or the width of the lifting brick is a multiple of the width of the microporous energy-saving lining brick. Reinforcing steel plates 5 are fixedly installed between adjacent microporous energy-saving lining bricks on the outer side of the lifting brick.

[0023] The height of the middle section of the lifting brick is not lower than the height of the two sides, and the height of the two sides of the lifting brick is not lower than the height of the inner side of the inner lining layer 2. The lifting brick includes a microporous energy-saving central brick body 3, and at least one microporous energy-saving protective brick 4 is provided on each side of the microporous energy-saving central brick body 3. The top surface height of the microporous energy-saving central brick body 3 is not lower than the top surface height of the microporous energy-saving protective brick 4. The microporous energy-saving central brick body 3 and the microporous energy-saving protective brick 4 are fixedly connected by an adhesive.

[0024] The lifting brick includes a microporous energy-saving central brick body 3 and a microporous energy-saving protective brick 4, which is an integral structure with the microporous energy-saving central brick body 3. The top surface height of the microporous energy-saving central brick body 3 is not lower than the top surface height of the microporous energy-saving protective brick 4.

[0025] In actual operation, the kiln lining structure, constructed from both lifting bricks and microporous energy-saving inner lining bricks, forms a corrugated, spiral-shaped structure for tipping, lifting, and pushing materials. This structure comprises at least four such sections, evenly distributed on the inner surface of the lining layer. This enhances the kiln's rigidity, high-temperature performance, and thermal insulation, mitigating the impact and abrasion of tipped and pushed materials on the kiln lining. The microporous energy-saving structure is superior to other refractory materials, ensuring its strength and hardness. Compared to existing metal lifting plates, it offers stronger impact resistance, better abrasion resistance, superior chemical corrosion resistance, lower manufacturing costs, and a longer service life. By employing a rotary kiln with lifting bricks, a corrugated spiral protrusion structure is formed along the kiln's operating direction to agitate, lift, and push the material. During kiln operation, this structure stirs, lifts, and pushes the material on the kiln lining surface, ensuring that the calcined material is fully and evenly exposed to the high-temperature flue gas for heat exchange. This improves the heat exchange efficiency between the material and the hot flue gas, thereby achieving the goal of consistently improving product quality and increasing production volume. Ultimately, this achieves the objectives of energy conservation, environmental protection, and a low-carbon economy.

[0026] By operating the mixing, hoisting, and pushing mechanisms, the materials are heated evenly, reducing energy consumption. This results in a relatively higher and more stable tricalcium silicate content in cement clinker, and a relatively higher and more stable calcium oxide content in limestone. Simultaneously, it can also improve the product quality of rotary kilns in other industries.

[0027] During operation, the lifting bricks can be installed in either a split or integrated structure. When a split structure is used, the microporous energy-saving central brick 3, the microporous energy-saving protective brick 4, and the microporous energy-saving lining brick are bonded together. All three types of bricks have equal thickness and fan-shaped cross-sections, with the smaller ends of all three bricks facing the center of the kiln axis. This fan-shaped cross-section design improves the adhesion between the three types of bricks, ensuring they are tightly bonded together.

[0028] During operation, the kiln lining structure of this utility model adopts a staggered design of lifting bricks on each ring from the top to the bottom, thus forming a progressive corrugated spiral convex structure of the lifting bricks. This can push the material from the kiln tail inlet 6 to the kiln head inlet, while stirring and turning the material at the bottom of the kiln lining. This will not cause a hard impact on the kiln lining and improve the service life of the kiln lining.

[0029] During operation, based on the kiln diameter and to meet actual material lifting, turning, and pushing requirements, four or more corrugated spiral protruding structures for turning, lifting, and pushing can be set up, evenly distributed on the inner wall of the kiln lining. This achieves optimal mixing, turning, lifting, and pushing effects.

[0030] During operation, the design of the reinforcing steel plate 5 ensures the stability of the lifting bricks. The reinforcing steel plate 5 contributes to the stability of the raised lifting brick structure, ensuring the effectiveness and service life of the mixing, turning, lifting, and pushing processes.

[0031] During the construction of the rotary kiln lining structure: based on the brick ratio of each ring of the rotary kiln body, starting from the bottom of the kiln body, the bricks are laid according to the ratio of lifting bricks to microporous energy-saving lining bricks in each ring, forming half of the first ring lining layer 2. Then, the second half of the second ring lining layer 2 is laid according to the brick ratio, and the lifting bricks of the second ring lining layer 2 are positioned opposite the lifting bricks of the first ring lining layer 2 by one microporous energy-saving lining brick, with the positioning direction being the same as the rotation direction of the rotary kiln. The two halves of the inner lining layer 2 are connected together, and subsequent multi-ring construction continues. Finally, the lifting bricks of each ring after positioning form a corrugated spiral protrusion structure for turning, lifting, and pushing materials. The half-built inner lining layer 2 is fixed with a fixing frame, and then the kiln body is rotated 180 degrees to construct the other half of the inner lining layer 2. Each ring of inner lining layer 2 has a locking brick at its end. This locking brick is positioned at the location of the microporous energy-saving inner lining brick in each ring, and a fitting support is provided between the fixing frame and the inner lining layer 2. The kiln lining is supported and tightened using a bricklaying machine, and the fixing frame uses an automatic bricklaying machine's top support and fixing mechanism to secure and support the bricks. The locking brick in each ring of the kiln lining is placed at the last position of that ring, at the location of the microporous energy-saving inner lining brick, to avoid it falling into contact with the lifting bricks.

[0032] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A rotary kiln lining structure, comprising an inner lining layer (2) consisting of several annular structures made of microporous energy-saving lining bricks disposed on the inner wall of the kiln body (1), characterized in that: Each ring of inner lining (2) is provided with at least four equally distributed lifting bricks. The inner side of the lifting brick protrudes from the inner side of the microporous energy-saving inner lining brick. The lifting bricks provided on each ring of inner lining (2) are arranged one brick in the direction of rotary kiln operation, and form a corrugated spiral protrusion structure for turning, lifting and pushing materials.

2. The rotary kiln lining structure according to claim 1, characterized in that: The lifting bricks and the microporous energy-saving lining bricks are fixedly connected by an adhesive. Each lifting brick and the microporous energy-saving lining brick are set facing the axis of the kiln body. The wedge angles on both sides of the lifting brick and the microporous energy-saving lining brick are equal. The widths of the lifting brick and the microporous energy-saving lining brick are equal, or the width of the lifting brick is a multiple of the width of the microporous energy-saving lining brick.

3. The rotary kiln lining structure according to claim 1, characterized in that: A reinforcing steel plate (5) is fixedly installed between the adjacent microporous energy-saving lining bricks on the outer side of the lifting brick.

4. The rotary kiln lining structure according to claim 1, characterized in that: The height of the middle of the lifting brick is not lower than the height of the two sides, and the height of the two sides of the lifting brick is not lower than the height of the inner side of the inner lining layer (2).

5. The rotary kiln lining structure according to claim 1, characterized in that: The lifting brick includes a microporous energy-saving central brick body (3), and at least one microporous energy-saving protective brick (4) is provided on both sides of the microporous energy-saving central brick body (3). The top surface height of the microporous energy-saving central brick body (3) is not lower than the top surface height of the microporous energy-saving protective brick (4).

6. The rotary kiln lining structure according to claim 1, characterized in that: The lifting brick includes a microporous energy-saving central brick body (3) and a microporous energy-saving protective brick (4) which is an integral structure with the microporous energy-saving central brick body (3). The top surface height of the microporous energy-saving central brick body (3) is not lower than the top surface height of the microporous energy-saving protective brick (4).

7. The rotary kiln lining structure according to claim 5, characterized in that: The microporous energy-saving central brick (3) and the microporous energy-saving protective brick (4) are fixedly connected by an adhesive.

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