Rotary kiln tail sealing device

Abstract

The utility model discloses a rotary kiln tail sealing device, which is characterized in that a connecting sleeve surrounds a discharge port of a smoke chamber and keeps standing along with the smoke chamber, and a friction sleeve is sleeved or butted with the kiln tail end of a kiln cylinder and rotates along with the kiln cylinder; each of the inner fish scale group and the outer fish scale group comprises a plurality of fish scales which are arranged in the circumferential direction of the friction sleeve, one end of each fish scale is connected with the connecting sleeve, the other end of each fish scale crosses the friction sleeve, every two adjacent fish scales are partially overlapped, and the tensioning rope is connected with a balancing weight to hoop the outer fish scale group, so that the outer fish scale group is folded and grabs the heat insulation flexible sealing plate; the heat insulation flexible sealing plate wraps the inner fish scale set, and the inner fish scale set keeps grabbing the friction sleeve. Compared with the prior art, the inner fish scale group, the heat insulation flexible sealing plate and the outer fish scale group form a continuous three-stage sealing structure, so that the ash emission, material leakage and air leakage coefficient of the kiln tail of the rotary kiln is greatly reduced, air leakage and ash emission are avoided, heat consumption is reduced, and energy conservation and environmental protection are achieved.

Description

Technical Field

[0001] The utility model relates to a rotary kiln, in particular to a rotary kiln tail sealing device. Background Art

[0002] The rotary kiln is the main equipment for cement production. The raw materials preheated by the preheater enter the kiln tube from the smoke chamber at the kiln tail. The fired clinker comes out from the kiln head and enters the grate cooler for cooling.

[0003] The kiln tail sealing device is one of the key equipment in the clinker burning system. The current single fish scale layer sealing or multi-ring maze sealing effect is still not ideal, and the ash and air leakage coefficient of the kiln tail needs to be improved urgently. Utility Model Content

[0004] The utility model aims to solve at least one of the above-mentioned technical problems and provide a rotary kiln tail sealing device to reduce the ash and air leakage coefficient at the kiln tail, reduce heat consumption and energy consumption, and improve the environment.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A rotary kiln tail sealing device comprises a connecting sleeve, a friction sleeve and a flexible sealing structure, wherein the connecting sleeve is suitable for surrounding the smoke chamber discharge port and remaining stationary with the smoke chamber, the friction sleeve is suitable for being sleeved or docked with the kiln tail end of the kiln drum and rotating with the kiln drum, the flexible sealing structure comprises an inner fish scale group, an insulating flexible sealing plate, an outer fish scale group and a tensioning rope, the inner fish scale group and the outer fish scale group both comprise a plurality of fish scales arranged along the circumference of the friction sleeve, one end of which is connected to the connecting sleeve and the other end spans the friction sleeve, and two adjacent fish scales are partially overlapped, the two ends of the inner fish scale group are respectively fitted with the connecting sleeve and the friction sleeve, the tensioning rope is connected with a counterweight block, so as to be suitable for clasping the outer fish scale group, so that the outer fish scale group is retracted and grasps the insulating flexible sealing plate, so that the insulating flexible sealing plate wraps around the inner fish scale group, so that the inner fish scale group keeps grasping the friction sleeve.

[0007] Compared with the existing technology, the beneficial effects of the present application include: the inner fish scale group, the heat-insulating flexible sealing plate, and the outer fish scale group form a continuous three-level sealing structure, which are coarse, tight and coarse sealing respectively, which greatly reduces the dust leakage and air leakage coefficient at the kiln tail of the rotary kiln, and presents no air leakage and dust leakage, reduces heat consumption, and is energy-saving and environmentally friendly; the tensioning rope and the counterweight hoop are dynamically sealed with little impact on the rolling of the kiln drum.

[0008] As an improvement of the above technical solution, the thermally insulating flexible sealing plate is a carbon-silicon-aluminum composite plate or a carbon-silicon-nickel composite plate.

[0009] As an improvement of the above technical solution, the outer layer of the thermal insulation flexible sealing plate is a wear-resistant layer, and the thermal insulation flexible sealing plate is suitable for partially wrapping around the friction sleeve under the grip of the outer fish scale group.

[0010] As an improvement of the above technical solution, the thermally insulating flexible sealing plate covers the connecting sleeve and is suitable as a thermal insulation film of the connecting sleeve.

[0011] As an improvement to the above technical solution, a dust discharge port is provided in the portion of the connecting sleeve that is not covered by the inner fish scale group, and the dust discharge port is enclosed with a window panel.

[0012] As an improvement of the above technical solution, it also includes an inner sleeve and a material lifting spoon rotatably connected to the inner sleeve, the inner sleeve is connected to the discharge port of the smoke chamber, and the material lifting spoon is connected to the kiln tail end of the kiln tube, and the material lifting spoon is suitable for guiding the discharge of the smoke chamber and the inner sleeve to the kiln tube during rotation, the inner sleeve and the material lifting spoon constitute a built-in thermal insulation sealing ring, and the connecting sleeve and the flexible sealing structure constitute an external thermal insulation sealing ring surrounding the built-in thermal insulation sealing ring.

[0013] As an improvement of the above technical solution, the portion of the lifting spoon surrounding the inner sleeve is provided with a reverse thread, and the reverse thread is suitable for rotating with the kiln drum to produce a reverse direction of ash and wind blocking.

[0014] As an improvement of the above technical solution, the connecting sleeve is provided with a vertebral flange suitable for mounting the flexible sealing structure, and the vertebral flange gradually narrows toward the friction sleeve.

[0015] As an improvement of the above technical solution, the outer wall of the friction sleeve is provided with a first convex edge extending in the circumferential direction, and the inner wall of the vertebral flange is provided with a second convex edge extending in the circumferential direction. The first convex edge and the second convex edge are staggered to form a labyrinth seal and a secondary seal of the kiln tail seal.

[0016] As an improvement of the above technical solution, the friction sleeve is made of silicon carbide ceramics, boron carbide ceramics, or silicon nitride ceramics. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following is a further detailed description of the specific embodiments of the present invention with reference to the accompanying drawings, wherein:

[0018] Figure 1 This is a schematic structural diagram of a rotary kiln tail sealing device according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A cross-sectional view showing a rotary kiln tail sealing device;

[0020] Figure 3 for Figure 1 Showing the disassembly of the rotary kiln tail sealing device Figure 1 ;

[0021] Figure 4 for Figure 2 A partial cross-sectional view showing a rotary kiln tail sealing device;

[0022] Figure 5 for Figure 1 Showing the disassembly of the rotary kiln tail sealing device Figure 2 .

[0023] The accompanying drawings are only one specific embodiment of the present invention, and the form and structure of this specific embodiment should not limit the scope of other embodiments.

[0024] Connecting sleeve 100, ash discharge port 110, cone flange 120, second flange 130;

[0025] Friction sleeve 200, first protrusion 210;

[0026] Flexible sealing structure 300, inner fish scale sheet group 310, thermal insulation flexible sealing plate 320, outer fish scale sheet group 330;

[0027] Inner sleeve 400;

[0028] Lifting spoon 500, reverse thread 510, lifting groove 520;

[0029] Smoke chamber 610, kiln tube 620. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Reference Figures 1 to 5The utility model provides a rotary kiln tail sealing device, including a connecting sleeve 100, a friction sleeve 200 and a flexible sealing structure 300. The connecting sleeve 100 is suitable for surrounding the discharge port of the smoke chamber 610 and remaining stationary with the smoke chamber 610. The friction sleeve 200 is suitable for sleeve-connecting or docking the kiln tail end of the kiln barrel 620 and rotating with the kiln barrel 620. The flexible sealing structure 300 includes an inner fish scale group 310, a heat-insulating flexible sealing plate 320, an outer fish scale group 330 and a tensioning rope. The inner fish scale group 310 and the outer fish scale group 330 are both wrapped. It includes a plurality of fish scales arranged along the circumference of the friction sleeve 200, with one end connected to the connecting sleeve 100 and the other end spanning the friction sleeve 200, and the adjacent fish scales are partially overlapped. The two ends of the inner fish scale group 310 are respectively fitted with the connecting sleeve 100 and the friction sleeve 200. The tensioning rope is connected with a counterweight block to be suitable for clasping the outer fish scale group 330, so that the outer fish scale group 330 is retracted and grasps the heat-insulating flexible sealing plate 320, so that the heat-insulating flexible sealing plate 320 is wrapped around the inner fish scale group 310, so that the inner fish scale group 310 keeps grasping the friction sleeve 200.

[0032] It can be understood that the inner fish scale group 310, the heat-insulating flexible sealing plate 320, the friction sleeve 200, etc. are made of high-temperature resistant materials, and the outer fish scale group 330 can be made of general steel or high-temperature resistant steel; the heat-insulating flexible sealing plate 320 is made of high-temperature resistant and flexible materials to achieve heat insulation and wrapping sealing (i.e., covering sealing). The heat-insulating flexible sealing plate 320, based on its own flexibility, covers the overlaps between the filling sealing fish scales and the two ends of the covering sealing fish scales, and is the most stringent of the three-level flexible seals.

[0033] In practice, the kiln tube 620 is tilted to a certain extent, and the kiln tail is tilted upward, which is convenient for material feeding and the flow of hot tail smoke.

[0034] The operation process of the utility model can be as follows:

[0035] The connecting sleeve 100 is connected to the smoke chamber 610 so as to surround and encapsulate the discharge port of the smoke chamber 610. The friction sleeve 200 is connected to or sleeved with the kiln tail end of the kiln tube 620. The inner fish scale group 310, the heat-insulating flexible sealing plate 320 and the outer fish scale group 330 are sequentially installed on the connecting sleeve 100. The inner fish scale group 310 and the outer fish scale group 330 are connected to the connecting sleeve 100 at one end and the other end is across the friction sleeve 200. The inner fish scale group 310 grabs the friction sleeve 200 in a natural state to achieve a flexible sealing structure. The primary flexible seal and coarse seal of the structure 300 are achieved by connecting the tension rope to the counterweight to encircle the outer fin group 330, so that the outer fin group 330 is retracted and grips the thermal insulation flexible sealing plate 320, thereby achieving the third-level flexible seal of the flexible sealing structure 300. The grip of the outer fin group 330 enables the thermal insulation flexible sealing plate 320 to tightly cover the inner fin group 310, thereby achieving the second-level seal and tight seal / gapless seal of the flexible sealing structure 300. The grip of the tension rope is also suitable for strengthening the retraction of the inner fin group 310.

[0036] During the heat insulation and sealing operation, the kiln barrel 620 starts and rolls in place, the friction sleeve 200 rotates with the kiln barrel 620, the connecting sleeve 100 and the flexible sealing structure 300 remain relatively stationary with the smoke chamber 610, and under the dynamic clamping action of the tensioning rope and its counterweight, the flexible sealing structure 300 as a whole can be deformed with the movement of the kiln barrel 620, adapting to the deformation, deflection and eccentricity of the kiln barrel 620, and the flexible sealing structure 300 realizes dynamic sealing. The kiln head of the kiln barrel 620 is heated by coal combustion, and the kiln tail preheater preheats the material based on the waste heat, and the preheated material is placed into the kiln tail port of the kiln barrel 620 through the smoke chamber 610.

[0037] Preferably, refer to Figure 5 The connecting sleeve 100 and the friction sleeve 200 are both sleeves assembled from multiple parts.

[0038] Compared with the prior art, the beneficial effects of the present application include: the inner fish scale group 310, the heat-insulating flexible sealing plate 320, and the outer fish scale group 330 form a continuous three-level sealing structure, which are coarse-level, tight-level and coarse-level sealing, respectively, which greatly reduces the coefficient of dust leakage and air leakage at the tail of the rotary kiln, resulting in no air leakage and no dust leakage, reducing heat consumption, energy saving and environmental protection; the tensioning rope and counterweight hoop are dynamically sealed with little impact on the rolling of the kiln barrel 620.

[0039] Furthermore, the friction sleeve 200 is made of silicon carbide ceramics, boron carbide ceramics, or silicon nitride ceramics. The friction sleeve 200 is resistant to high temperatures and has a relatively low friction coefficient.

[0040] In some embodiments of the present invention, the thermal insulation flexible sealing plate 320 is a carbon silicon aluminum composite plate or a carbon silicon nickel composite plate, which is a special high temperature resistant and wear resistant semi-flexible new composite material that can still maintain good mechanical properties at temperatures of 1000°C to 1200°C, thereby ensuring the sealing effect and service life; the inner core is a flexible thermal insulation material, such as ceramic fiber, and the outer layer is a heat-resistant steel foil, such as carbon silicon aluminum foil or carbon silicon nickel foil.

[0041] In some embodiments of the present invention, the outer layer of the thermal insulation flexible sealing plate 320 is a wear-resistant layer, such as carbon silicon aluminum foil, carbon silicon nickel foil, which is resistant to high temperature, has high hardness, and has small thermal changes. The thermal insulation flexible sealing plate 320 is suitable for partially wrapping around the friction sleeve 200 under the grasp of the outer fish scale group 330 to improve the heat preservation and sealing effect.

[0042] Reference Figures 1 to 4 In some embodiments of the present invention, the heat-insulating flexible sealing plate 320 covers the connecting sleeve 100 and serves as a heat-insulating film for the connecting sleeve 100 to enhance the heat-insulating and sealing effect.

[0043] In some configurations, the thermally insulating flexible sealing plate 320 is merely pressed and fixed by the outer fish scale group 330. Preferably, the portion of the thermally insulating flexible sealing plate 320 covering the connecting sleeve 100 is further connected to a hoop, so that the thermally insulating flexible sealing plate 320 embraces the connecting sleeve 100, and the thermally insulating flexible sealing plate 320 serves as a tight thermal insulation film for the connecting sleeve 100.

[0044] Reference Figure 2 、 Figure 3 In some embodiments of the present invention, the portion of the connecting sleeve 100 not covered by the inner fish scale assembly 310 is provided with an ash discharge port 110, which is enclosed by a window panel. The connecting sleeve 100 is provided with a hopper corresponding to the ash discharge port 110 to facilitate regular cleaning of the ash that is about to emerge from the kiln tail.

[0045] Reference Figures 2 to 5 In some embodiments of the present invention, an inner sleeve 400 and a material lifting scoop 500 rotatably connected to the inner sleeve 400 are further included. The inner sleeve 400 is connected to the discharge port of the smoke chamber 610, and the material lifting scoop 500 is connected to the kiln tail end of the kiln shaft 620. The material lifting scoop 500 is adapted to guide the material discharged from the smoke chamber 610 and the inner sleeve 400 to the kiln shaft 620 during rotation. The inner sleeve 400 and the material lifting scoop 500 form an internal heat-insulating sealing ring, and the connecting sleeve 100 and the flexible sealing structure 300 form an external heat-insulating sealing ring surrounding the internal heat-insulating sealing ring. Specifically, the inner sleeve 400 and the material lifting scoop 500 are rotatably connected by a shaft hole, which is adapted to serve as the primary sealing structure for the kiln tail end. Material is input into the material lifting scoop 500 through the inner sleeve 400. The material lifting scoop 500 tilts to a certain extent along with the kiln shaft 620, so that the material lifting scoop 500 continuously throws material into the kiln shaft 620 during rotation.

[0046] Reference Figures 2 to 5In some embodiments of the present invention, the portion of the lifting scoop 500 surrounding the inner sleeve 400 is provided with reverse-thrust threads 510. These reverse-thrust threads 510 are adapted to rotate with the kiln drum 620 to create a reverse direction that blocks ash and wind. Specifically, this section of the lifting scoop 500 functions as a roller that pushes material using threads, with the threads acting as fan blades. This significantly improves the primary sealing effect of the kiln tail seal compared to a simple shaft-hole fit.

[0047] Preferably, refer to Figure 2 、 Figure 4 The reverse thread 510 is closer to the axis of the lifting spoon 500 than the lifting groove 520, that is, the reverse thread 510 is closer to the center than the lifting groove 520, that is, the lower end of the lifting spoon, the reverse thread 510 is higher than the lifting groove 520, and the reverse thread 510 is suitable for pushing the ash back to the lifting groove 520, so as to facilitate the return of the ash to the material.

[0048] Reference Figures 2 to 5 In some embodiments of the present invention, the connecting sleeve 100 is provided with a conical flange 120 suitable for installing the flexible sealing structure 300. The conical flange 120 gradually narrows toward the friction sleeve 200, and the fish scales can fit the friction sleeve 200 more closely.

[0049] Reference Figure 2 、 Figure 4 In some embodiments of the present invention, a first ridge 210 extending circumferentially is formed on the outer wall of the friction sleeve 200, and a second ridge 130 extending circumferentially is formed on the inner wall of the cone flange 120. The first ridge 210 and the second ridge 130 intersect to form a labyrinth seal, a secondary seal of the kiln tail seal. The flexible sealing structure 300 forms a tertiary seal of the kiln tail seal.

[0050] The above embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit the present invention. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be included in the scope of the technical solution of the present invention.

Claims

1. A rotary kiln tail sealing device, characterized in that: include: The connecting sleeve is adapted to surround the discharge port of the smoke chamber and remain stationary with the smoke chamber; A friction sleeve is adapted to be sleeved or butted against the kiln tail end of the kiln shaft and rotates with the kiln shaft; A flexible sealing structure includes an inner fish scale group, an insulating flexible sealing plate, an outer fish scale group and a tensioning rope. The inner fish scale group and the outer fish scale group both include a plurality of fish scales arranged along the circumference of the friction sleeve, with one end connected to the connecting sleeve and the other end spanning the friction sleeve, and two adjacent fish scales are partially overlapped. The two ends of the inner fish scale group are respectively attached to the connecting sleeve and the friction sleeve. The tensioning rope is connected with a counterweight block to be suitable for clasping the outer fish scale group, so that the outer fish scale group is retracted and grasps the insulating flexible sealing plate, so that the insulating flexible sealing plate wraps around the inner fish scale group, so that the inner fish scale group keeps grasping the friction sleeve.

2. The rotary kiln tail sealing device according to claim 1, characterized in that: The thermal insulation flexible sealing plate is a carbon silicon aluminum composite plate or a carbon silicon nickel composite plate.

3. The rotary kiln tail sealing device according to claim 1, characterized in that: The outer layer of the heat-insulating flexible sealing plate is a wear-resistant layer. The heat-insulating flexible sealing plate is suitable for partially wrapping around the friction sleeve under the grip of the outer fish scale group.

4. The rotary kiln tail sealing device according to claim 1, characterized in that: The heat-insulating flexible sealing plate covers the connecting sleeve and is suitable as a heat-insulating film for the connecting sleeve.

5. The rotary kiln tail sealing device according to claim 4, characterized in that: An ash discharge port is provided on the portion of the connecting sleeve that is not covered by the inner fish scale group, and the ash discharge port is enclosed with a window panel.

6. The rotary kiln tail sealing device according to any one of claims 1 to 5, characterized in that: It also includes an inner sleeve and a material lifting spoon rotatably connected to the inner sleeve, the inner sleeve docking with the material outlet of the smoke chamber, the material lifting spoon docking with the kiln tail end of the kiln tube, the material lifting spoon is suitable for guiding the material outlet of the smoke chamber and the inner sleeve to the kiln tube during rotation, the inner sleeve and the material lifting spoon form a built-in thermal insulation sealing ring, and the connecting sleeve and the flexible sealing structure form an external thermal insulation sealing ring surrounding the built-in thermal insulation sealing ring.

7. The rotary kiln tail sealing device according to claim 6, characterized in that: The portion of the lifting spoon surrounding the inner sleeve is provided with a reverse thread, and the reverse thread is suitable for rotating with the kiln drum to produce a reverse direction of ash and wind blocking.

8. The rotary kiln tail sealing device according to any one of claims 1 to 5, characterized in that: The connecting sleeve is provided with a cone flange suitable for mounting the flexible sealing structure, and the cone flange gradually narrows toward the friction sleeve.

9. The rotary kiln tail sealing device according to claim 8, characterized in that: The outer wall of the friction sleeve is provided with a first convex edge extending in the circumferential direction, and the inner wall of the cone flange is provided with a second convex edge extending in the circumferential direction. The first convex edge and the second convex edge are staggered to form a labyrinth seal and a secondary seal of the kiln tail seal.

10. The rotary kiln tail sealing device according to any one of claims 1 to 5, characterized in that: The friction sleeve is made of silicon carbide ceramics, boron carbide ceramics, or silicon nitride ceramics.

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