Sealing device for kiln head of lime rotary kiln

Abstract

The utility model belongs to the technical field of rotary kiln sealing, and particularly relates to a sealing device for a kiln head of a lime rotary kiln, which comprises a kiln head cover, a dust collection box is arranged between the kiln head cover and the kiln head, one end of the dust collection box is connected with the outer wall of the kiln head through a first fixing ring, and the kiln head cover is connected with the other end of the dust collection box through a second fixing ring. A labyrinth sealing ring is arranged between the second fixing ring and the kiln head; the dust collection box comprises a dust removal cover arranged on the upper portion and a dust accumulation hopper arranged on the lower portion. The dust removal cover is composed of a reinforcement cage, a steel wire mesh and high-temperature dust removal covering cloth. And a gate valve is arranged at the bottom of the ash deposition hopper. Compared with the prior art, the labyrinth sealing structure has the advantages that the labyrinth sealing structure is combined with the dust collecting box, the problems that after a rotary kiln runs in a full-product mode, dust at the kiln head is serious, and dust is difficult to discharge are solved, the stable sealing requirement of the kiln head is met, and long-term stable running of production is guaranteed; and 2) the high-temperature-resistant dustproof cloth can ensure the air permeability of the kiln head.

Description

Technical Field

[0001] This utility model belongs to the field of rotary kiln sealing technology, and particularly relates to a sealing device for the kiln head of a lime rotary kiln. Background Technology

[0002] A rotary kiln is a high-temperature calcining furnace that uses the rotation of the kiln body. Based on the type of raw material being calcined, it is mainly divided into cement rotary kilns, lime rotary kilns, and metallurgical and chemical rotary kilns. The calcination process in a rotary kiln mainly involves gas flow, fuel combustion, heat transfer, and material tumbling. Through a reasonable ratio of fuel and air, complete combustion is achieved. Heat is directly and efficiently transferred to the material through fuel, which undergoes specific solid-phase chemical reactions at high temperatures, ultimately calcining into finished clinker. During normal operation of a rotary kiln, ash emission is not very noticeable because the kiln head is under negative pressure. However, if operational problems occur, ash leakage from the kiln head will be very serious.

[0003] Existing rotary kiln head seals have the following defects: most adopt built-in or external fish scale sealing structures, and when the kiln body is subjected to upward force, a squeezing force will be generated, causing the fish scales to bulge up, allowing cold air to enter the kiln head cover, resulting in incomplete fuel combustion and wasting energy. Therefore, the effectiveness of the rotary kiln head seal plays a decisive role in the stable operation of the kiln and the calcination process.

[0004] Chinese utility model patent application number 202221615116.2 discloses a rotary kiln sealing device, including a kiln head hood and a kiln body. A sealing mechanism is provided between the kiln head hood and the kiln body. The sealing mechanism includes a connecting pipe fixedly connected to the feed end of the kiln head hood, with an installation ring fixedly connected to the other end of the connecting pipe. A sealing ring is detachably installed on the other end of the installation ring. In this rotary kiln sealing device, during the rotation of the kiln body, each rotor rotates on the side wall of the flange, continuously rotating and pressing the contact surface between the flange and the sealing ring, ensuring that the end face of the flange is always tightly fitted with the sealing ring. However, because the kiln head of the rotary kiln rotates continuously, and there is also the possibility of deformation of the sealing ring under high temperatures, this type of sealing ring-based technical solution cannot achieve long-term safe operation. Utility Model Content

[0005] The purpose of this utility model is to provide a sealing device for the kiln head of a lime rotary kiln, which overcomes the shortcomings of the existing technology. It adopts a labyrinth sealing structure combined with a dust collection box to solve the environmental problem of serious dust emission from the kiln head and difficulty in dust discharge after the rotary kiln reaches full production capacity. It meets the stable sealing requirements at the kiln head, ensures long-term stable operation of production, and reduces the labor intensity of on-site cleaning.

[0006] To achieve the above objectives, this utility model employs the following technical solution:

[0007] A sealing device for the kiln head of a lime rotary kiln includes a kiln head hood, a dust collection box between the kiln head hood and the kiln head, one end of the dust collection box being connected to the outer wall of the kiln head via a first fixing ring, and the other end of the kiln head hood being connected to the dust collection box via a second fixing ring, with a labyrinth sealing ring between the second fixing ring and the kiln head; the dust collection box includes a dust removal hood in the upper part and an ash hopper in the lower part, the dust removal hood being composed of a steel cage, a wire mesh, and a high-temperature dust removal covering cloth; and a slide valve is provided at the bottom of the ash hopper.

[0008] Furthermore, the labyrinth sealing ring includes a first vertical plate, a second vertical plate, and a middle partition cover plate. The first and second vertical plates are connected side by side and perpendicularly to the outer wall of the kiln head. The middle partition cover plate has an L-shaped cross-section and an inner reinforcing plate with a T-shaped cross-section is provided on the inner side of the cover plate. One side of the middle partition cover plate is fixedly connected to the first fixing ring. The first vertical plate, the inner reinforcing plate, the second vertical plate, and the other side of the middle partition cover plate form a labyrinth sealing structure.

[0009] Furthermore, the second fixing ring is connected to the fixing bracket, and the bottom of the fixing bracket is fixedly installed with a first fixing column and a second fixing column, which are fixedly erected on the kiln body foundation.

[0010] Furthermore, the wire mesh has square or parallelogram-shaped holes with a side length of 10-25mm.

[0011] Furthermore, the high-temperature dust removal cloth is a fluorinated fluorinated cloth with a thickness of 2.4-2.6 mm.

[0012] Furthermore, the high-temperature dust removal cloth and the wire mesh are fixed together by steel straps.

[0013] Furthermore, the top of the fixed bracket is provided with multiple reinforcing rods.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1) The combination of labyrinth sealing structure and dust collection box solves the problem of serious dust emission from the kiln head and difficulty in dust discharge after the rotary kiln reaches full production capacity, meets the stable sealing requirements at the kiln head, and ensures long-term stable production operation;

[0016] 2) High-temperature resistant dustproof cloth can ensure the air permeability of the kiln head, which helps to overcome the impact of pressure fluctuations in the kiln on the sealing effect of the kiln head. Dust hoods and ash hoppers can capture and hold dust, reducing the labor intensity of on-site cleaning. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0018] Figure 2This is a three-dimensional perspective view of an embodiment of the present utility model;

[0019] Figure 3 This is a two-dimensional perspective view of an embodiment of the present invention;

[0020] Figure 4 This is an exploded structural diagram of an embodiment of the present invention; the high-temperature dust removal covering is not shown.

[0021] Figure 5 This is a schematic diagram of the labyrinth sealing ring structure in an embodiment of this utility model;

[0022] In the diagram: 1-Kiln head, 2-First fixing ring, 3-High-temperature dust removal cloth, 4-Kiln head cover, 5-First vertical plate, 6-Second vertical plate, 7-Intermediate partition cover, 8-First fixing column, 9-Second fixing column, 10-Dust collection box, 11-Reinforcing cage, 12-Wire mesh, 13-Ash hopper, 14-Second fixing ring, 15-Inner reinforcing plate, 16-Fixed bracket, 17-Reinforcing rod, 18-Insert valve, 19-Maze sealing ring. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the specific embodiments used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some embodiments of this utility model. For those skilled in the art, other specific embodiments can be obtained based on these specific embodiments without creative effort.

[0025] The components of the present invention described and shown in the specific embodiments herein can be arranged and designed in numerous different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but only to illustrate selected embodiments of the invention.

[0026] See Figure 1-4 This is a schematic diagram of an embodiment of a sealing device for the kiln head of a lime rotary kiln, including a kiln head cover 4, a dust collection box 10 between the kiln head cover 4 and the kiln head 1, the material thickness of the kiln head 1 is 50mm, the outer diameter of the kiln head cover 4 is 4350mm, and the kiln head cover 4 is connected to the original dust collection pipeline through a flange.

[0027] One end of the dust collection box 10 is connected to the outer wall of the kiln head 1 via a first fixing ring 2, and the other end of the kiln head hood 4 is connected to the dust collection box 10 via a second fixing ring 14. A labyrinth sealing ring 19 is provided between the second fixing ring 14 and the kiln head 1. The dust collection box 10 includes a dust removal hood in the upper part and an ash hopper 13 in the lower part. The dust removal hood is composed of a steel cage 11, a wire mesh 12, and a high-temperature dust removal cloth 3. The high-temperature dust removal cloth 3 is a fluorinated fluoride dust removal cloth with a thickness of 2.4-2.6 mm.

[0028] The high-temperature dust removal cloth 3 and the wire mesh 12 are fixed by steel straps to reduce the problem of ash leakage caused by loose binding. While ensuring air permeability, it can also prevent ash from escaping from the kiln head. This solves the problem of serious ash emission from the kiln head and dust discharge after the rotary kiln reaches full production capacity in the existing production process.

[0029] The bottom of the ash hopper 13 is equipped with a slide valve 18, which facilitates the timed discharge of ash and reduces the labor intensity of on-site cleaning.

[0030] See Figure 5 The labyrinth sealing ring includes a first vertical plate 5, a second vertical plate 6, and a middle partition cover plate 7. The first vertical plate 5 and the second vertical plate 6 are connected to the outer wall of the kiln head 1 in parallel and perpendicular. The middle partition cover plate 7 has an L-shaped cross-section and an inner reinforcing plate 15 with a T-shaped cross-section is provided on the inner side of the cover plate. One side of the middle partition cover plate 7 is fixedly connected to the first fixing ring 2. The first vertical plate 5, the inner reinforcing plate 15, the second vertical plate 6, and the middle partition cover plate 7 form a labyrinth sealing structure on the other side. This sealing structure is not affected by the rotation of the kiln head and does not have the problem of high-temperature deformation, so the sealing effect is stable.

[0031] The second fixing ring 14 is connected to the fixing bracket 16. The bottom of the fixing bracket 16 is fixedly installed with the first fixing column 8 and the second fixing column 9, which are fixedly erected on the kiln body foundation. The top of the fixing bracket 16 is provided with multiple reinforcing rods 17 to improve its support strength. It can also be suspended from the fixed object above with the help of the fixing bracket 16, which helps to further improve the installation stability of the device.

[0032] In this embodiment, the wire mesh 12 has square or parallelogram holes with a side length of 10-25mm, which provides effective support while reducing the space for dust accumulation and hiding.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sealing device for the kiln head of a lime rotary kiln, comprising a kiln head cover (4), characterized in that: A dust collection box (10) is provided between the kiln head hood (4) and the kiln head (1). One end of the dust collection box (10) is connected to the outer wall of the kiln head (1) through a first fixing ring (2). The other end of the kiln head hood (4) and the dust collection box (10) are connected through a second fixing ring (14). A labyrinth sealing ring (19) is provided between the second fixing ring (14) and the kiln head (1). The dust collection box (10) includes a dust removal hood in the upper part and an ash hopper (13) in the lower part. The dust removal hood is composed of a steel cage (11), a wire mesh (12) and a high-temperature dust removal cloth (3). A slide valve (18) is provided at the bottom of the ash hopper (13).

2. The sealing device for the kiln head of a lime rotary kiln according to claim 1, characterized in that, The labyrinth sealing ring (19) includes a first vertical plate (5), a second vertical plate (6), and a middle partition cover plate (7). The first vertical plate (5) and the second vertical plate (6) are connected side by side and vertically to the outer wall of the kiln head (1). The middle partition cover plate (7) has an L-shaped cross-section and an inner reinforcing plate (15) with a T-shaped cross-section is provided on the inner side of the cover plate. One side of the middle partition cover plate (7) is fixedly connected to the first fixing ring (2). The first vertical plate, the inner reinforcing plate, the second vertical plate, and the middle partition cover plate (7) form a labyrinth sealing structure on the other side.

3. The sealing device for the kiln head of a lime rotary kiln according to claim 1, characterized in that, The second fixing ring (14) is connected to the fixing bracket (16). The bottom of the fixing bracket (16) is fixedly installed with the first fixing column (8) and the second fixing column (9). The first fixing column (8) and the second fixing column (9) are fixedly set on the kiln body foundation.

4. The sealing device for the kiln head of a lime rotary kiln according to claim 1, characterized in that, The wire mesh (12) has square or parallelogram-shaped holes with a side length of 10-25 mm.

5. The sealing device for the kiln head of a lime rotary kiln according to claim 1, characterized in that, The high-temperature dust removal cloth (3) is a fluorinated dust removal cloth with a thickness of 2.4-2.6 mm.

6. The sealing device for the kiln head of a lime rotary kiln according to claim 1, characterized in that, The high-temperature dust removal cloth (3) and the wire mesh (12) are fixed together by steel straps.

7. A sealing device for the kiln head of a lime rotary kiln according to claim 3, characterized in that, The top of the fixed bracket (16) is provided with multiple reinforcing rods (17).

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