Anti-blocking device for calcined alumina rotary kiln
Patent Information
- Application Number
- CN202522379658.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-10
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-11-10
AI Technical Summary
[0004]本实用新型的目的是提供一种煅烧氧化铝回转窑的防堵装置，解决了现有人工停窑清理积料耗费大量人力与时间的技术问题
[0021]相对于上述背景技术，本实用新型提供的煅烧氧化铝回转窑的防堵装置，除渣箱与出料管道垂直连通，除渣箱内部设有倾斜布置的篦子，篦子用于对下落的大块或团聚物料进行破碎和分散，吹灰器通过除渣箱出料管与除渣箱连接，接收经破碎后的物料；高压风管连接至吹灰器，用于引入由空压机提供的高压气流；回料管一端连接吹灰器的出料口，另一端伸入回转窑的窑尾烟道内，进而吹灰器在高压风与窑尾烟道负压的协同作用下形成气力输送环境，使积料经回料管被输送至窑尾烟道，并随高温烟气进入末级旋风换热系统，与新加入的氢氧化铝物料混合，重新进入回转窑内进行煅烧，进而实现积料的在线清除与资源化回收利用，避免人工清堵，提高生产连续性与运行效率。
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Figure CN224905745U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of calcined alumina preparation technology, and in particular to an anti-clogging device for a rotary kiln for calcined alumina. Background Technology
[0002] In the production process of calcining alumina in a rotary kiln, the rotary kiln, as the core thermal equipment, directly affects product quality and production capacity due to its operational stability. The unobstructed flow of the feed inlet at the kiln tail is particularly critical; blockage will severely affect the continuous supply of material, leading to uneven calcination or even interruption of the process. However, in actual production, frequent blockages at the feed inlet are mainly due to the following reasons: Before entering the high-temperature section of the rotary kiln, the alumina raw material undergoes a preheating and dehydration process. Some material forms lumps or sintered slag due to uneven heating or increased adhesion. Simultaneously, during the circulating return process, the return scoop often throws small amounts of high-temperature material into the feed trough area, which accumulates over time. When these accumulations are not removed in time, they gradually increase in size and obstruct the normal flow of new material, eventually causing poor feeding or complete blockage. Currently, manual kiln shutdown and cleaning are commonly used for this purpose. This not only requires a lot of manpower and time, but also leads to frequent production line interruptions, reduces equipment operating rate, increases energy consumption per unit product, and may affect the stability of the thermal regime inside the kiln due to repeated start-ups and shutdowns.
[0003] Therefore, how to provide an anti-clogging device for a rotary kiln for calcining alumina to achieve automatic collection, crushing, and recycling of accumulated material is a technical problem that needs to be solved by those skilled in the art. Utility Model Content
[0004] The purpose of this invention is to provide an anti-clogging device for a rotary kiln used for calcining alumina, which solves the technical problem that existing manual kiln shutdown and cleaning of accumulated material consumes a lot of manpower and time.
[0005] To achieve the above objectives, this utility model provides an anti-clogging device for a rotary kiln used for calcining alumina, comprising:
[0006] The material hopper is located below the rotary kiln's discharge hopper and is used to collect accumulated material.
[0007] A discharge pipe is connected to the lower outlet of the accumulation silo;
[0008] The slag removal box is vertically connected to the discharge pipe and is equipped with a grate for crushing materials inside.
[0009] The material recovery unit includes a soot blower, a discharge pipe, a high-pressure air pipe, and a return pipe. The soot blower is connected to the slag removal box through the discharge pipe. The high-pressure air pipe is connected to the soot blower to provide high-pressure air. The return pipe is connected between the soot blower and the kiln tail flue of the rotary kiln.
[0010] Preferably, the material accumulation recycling unit includes a first material accumulation recycling unit and a second material accumulation recycling unit;
[0011] The first material recovery unit includes a first discharge pipe, a first soot blower, and a first high-pressure air pipe and a first return pipe connected in sequence to the first soot blower.
[0012] The second material recovery unit includes a second discharge pipe, a second soot blower, and a second high-pressure air pipe and a second return pipe connected in sequence to the second soot blower.
[0013] Preferably, the slag removal box has a rectangular box structure, and the grate is inclinedly arranged inside the slag removal box.
[0014] Preferably, a cleaning valve is provided on the side wall of the slag removal box.
[0015] Preferably, a discharge pipe is provided at the bottom of the slag removal box.
[0016] Preferably, both the first discharge pipe and the second discharge pipe are equipped with switch valves.
[0017] Preferably, both the first soot blower and the second soot blower have an arc-shaped structure and are installed at an angle.
[0018] Preferably, the first soot blower and the second soot blower are respectively provided with a first detachable flange blind plate and a second detachable flange blind plate on their side walls.
[0019] Preferably, both the first high-pressure air duct and the second high-pressure air duct are connected to an air compressor to provide high-pressure air with a pressure range of 0.5-0.6 MPa.
[0020] Preferably, the material storage bin has a frustum structure.
[0021] Compared to the aforementioned background technology, the anti-clogging device for a rotary kiln used for calcining alumina provided by this utility model features a slag removal box vertically connected to the discharge pipe. The slag removal box contains inclined grates for crushing and dispersing large or agglomerated materials. A soot blower is connected to the slag removal box via its discharge pipe to receive the crushed material. A high-pressure air duct is connected to the soot blower to introduce high-pressure airflow from an air compressor. One end of a return pipe is connected to the outlet of the soot blower, and the other end extends into the kiln tail flue of the rotary kiln. Under the combined action of high-pressure air and the negative pressure of the kiln tail flue, the soot blower creates a pneumatic conveying environment, allowing the accumulated material to be transported to the kiln tail flue via the return pipe. The material then enters the final-stage cyclone heat exchange system with the high-temperature flue gas, mixes with newly added aluminum hydroxide material, and re-enters the rotary kiln for calcination. This achieves online removal and resource recycling of the accumulated material, avoiding manual clogging and improving production continuity and operational efficiency. Attached Figure Description
[0022] 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0023] Figure 1 A front view of an anti-clogging device for a rotary kiln for calcining alumina provided in an embodiment of this utility model;
[0024] Figure 2 for Figure 1 Side view;
[0025] Figure 3 This is a partial cross-sectional view of the slag removal box provided in an embodiment of the present utility model;
[0026] Figure 4 This is a schematic diagram showing the connection between the rotary kiln and the material silo provided in an embodiment of the present utility model;
[0027] Figure 5 This is a schematic diagram of the material storage bin structure provided in an embodiment of the present utility model;
[0028] Figure 6 A flowchart illustrating the anti-clogging device for a rotary kiln used for calcining alumina, provided in this embodiment of the present invention.
[0029] in:
[0030] 1-Accumulation bin, 11-Discharge pipe, 2-Rotary kiln, 3-Slag removal box, 31-Grate, 32-Cleaning valve, 33-Discharge pipe, 4-First discharge pipe, 41-Second discharge pipe, 5-First soot blower, 51-Second soot blower, 52-First detachable flange baffle, 53-Second detachable flange baffle, 6-First high-pressure air duct, 61-Second high-pressure air duct, 7-First return pipe, 71-Second return pipe. Detailed Implementation
[0031] 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.
[0032] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0033] See Figure 1 , Figure 2 , Figure 4 and Figure 6 This application provides an anti-clogging device for a rotary kiln for calcining alumina, comprising a material collection bin 1, located below the material feeding trough of the rotary kiln 2, for collecting accumulated material; a discharge pipe 11, connected to the lower outlet of the material collection bin 1; a slag removal box 3, vertically connected to the discharge pipe 11, with a grate 31 for crushing materials inside; and a material collection recovery unit, comprising a soot blower, a slag removal box 3, a discharge pipe, a high-pressure air pipe, and a return pipe. The soot blower is connected to the slag removal box 3 via the discharge pipe, the high-pressure air pipe is connected to the soot blower to provide it with high-pressure air, and the return pipe is connected between the soot blower and the kiln tail flue of the rotary kiln 2. Under the combined action of the high-pressure air and the negative pressure of the kiln tail flue, the accumulated material returns to the kiln tail flue via the return pipe, enters the final stage cyclone heat exchange system with the flue gas, mixes with the new material, and then re-enters the rotary kiln 2 for calcination.
[0034] Specifically, the material hopper 1 is located below the feed hopper of the rotary kiln 2 and is used to collect the accumulated material in the feed port area due to material adhesion, return material throwing, or high-temperature agglomeration. The discharge pipe 11 is connected to the bottom outlet of the material hopper 1, and the slag removal box 3 is vertically connected to the discharge pipe 11. The slag removal box 3 is equipped with inclined grates 31 inside, which are used to crush and disperse large pieces or agglomerated materials falling down. The material recovery unit includes a soot blower, a slag removal box discharge pipe, a high-pressure air pipe, and a return pipe. The soot blower is connected to the slag removal box 3 through the slag removal box discharge pipe and receives the crushed material. The high-pressure air pipe is connected to the soot blower and is used to introduce high-pressure airflow provided by the air compressor. One end of the return pipe is connected to the discharge port of the soot blower, and the other end extends into the kiln tail flue of the rotary kiln 2.
[0035] During operation, the soot blower creates a pneumatic conveying environment under the combined action of high-pressure air and negative pressure in the kiln tail flue. This allows the accumulated material to be transported to the kiln tail flue through the return pipe and enter the final cyclone heat exchange system with the high-temperature flue gas. There, it mixes with the newly added aluminum hydroxide material and re-enters the rotary kiln for calcination. This process achieves online removal and resource recycling of the accumulated material, avoiding manual cleaning and improving production continuity and operational efficiency.
[0036] Based on the above embodiments, see Figure 1 and Figure 2 The material recovery unit is configured as two parallel sets, including a first material recovery unit and a second material recovery unit; the first material recovery unit includes a first discharge pipe 4, a first soot blower 5, and a first high-pressure air pipe 6 and a first return pipe 7 connected in sequence to the first soot blower 5; the second material recovery unit includes a second discharge pipe 41, a second soot blower 51, and a second high-pressure air pipe 61 and a second return pipe 71 connected in sequence to the second soot blower 51.
[0037] Specifically, one end of the first discharge pipe 4 is connected to the slag removal box 3, and the other end is connected to the feed inlet of the first soot blower 5; the first high-pressure air pipe 6 is connected to the first soot blower 5 to introduce high-pressure airflow; the first return pipe 7 is connected to the discharge port of the first soot blower 5 and the kiln tail flue of the rotary kiln 2 to transport the material back into the system for circulating calcination; correspondingly, one end of the second discharge pipe 41 is connected to the slag removal box 3, and the other end is connected to the feed inlet of the second soot blower 51; the second high-pressure air pipe 61 is connected to the second soot blower 51 to provide a high-pressure air source; the second return pipe 71 is connected to the discharge port of the second soot blower 51 and the kiln tail flue to realize the return of material.
[0038] Based on the above embodiments, see Figure 3 The slag removal box 3 has a rectangular box structure, and the grate 31 is inclinedly installed inside the slag removal box 3.
[0039] Specifically, the slag removal box 3 has a rectangular box structure, specifically a cuboid shell welded from steel plates. Its preferred dimensions are 1.5m in length, 1.5m in width, and 1.0m in height. The grate 31 is inclinedly installed inside the slag removal box 3, arranged from high to low from the end near the discharge pipe 11 on the feed side to the end near the first discharge pipe 4 and the second discharge pipe 41 on the discharge side. Specifically, the left fixed end of the grate 31 is 0.2m from the top surface of the slag removal box, and the right fixed end is 0.4m from the bottom surface, forming an overall inclination angle of about 20° to 30°. This effectively intercepts large clumps of material and allows the crushed fine material to slide down the inclined surface, avoiding accumulation and blockage.
[0040] Preferably, the grate 31 is composed of multiple heat-resistant alloy round or flat steel bars with a diameter of not less than 30 mm arranged in parallel, with a spacing of 50-100 mm. These bars are fixed to the support lugs on the inner wall of the slag removal box 3 by welding or bolting, forming a grid-type crushing structure. When the high-temperature accumulated material falls vertically from the discharge pipe 11, large pieces of material impact the surface of the grate 31 and are crushed under the combined action of gravity and impact force, achieving both coarse screening and deagglomeration functions.
[0041] Further, see Figure 1 and Figure 3 The side wall of the slag removal box 3 is equipped with a maintenance cleaning valve 32, preferably 300mm in diameter, located in the vicinity of the grate 31, for manual unclogging or removal of severe scale; the bottom is equipped with a discharge pipe 33, 200mm in diameter, connected to a ball valve or a slide valve, for periodically discharging residues or metal foreign objects that cannot be carried away by the pneumatic conveying system, ensuring long-term stable operation of the device.
[0042] Based on the above embodiments, see Figure 1 Both the first discharge pipe 4 and the second discharge pipe 41 are equipped with switch valves 43.
[0043] Specifically, both the first discharge pipe 4 and the second discharge pipe 41 are equipped with switch valves 43. The switch valves 43 are installed in the middle section of the two discharge pipes to control the flow of materials in each branch.
[0044] Preferably, the switching valve 43 is a manual slide gate valve, a pneumatic slide gate valve, or a ball valve, which has good sealing performance and wear resistance, and can withstand frequent operation in high-temperature and dusty environments. By independently controlling the switching valves 43 on the first discharge pipe 4 and the second discharge pipe 41, the first and second material recovery units can be operated separately, maintained individually, or used alternately.
[0045] Based on the above embodiments, see Figure 2 Both the first soot blower 5 and the second soot blower 51 have an arc-shaped structure and are set at an angle.
[0046] In other words, both the first soot blower 5 and the second soot blower 51 are arc-shaped structures and are inclined along the material conveying direction. Specifically, the soot blower is an arc-shaped or curved tube shell, and its shape is composed of a circular arc segment with a chord length of 700mm and an arch height of 300mm. The width is 300mm, and a smooth arc-shaped flow channel is formed inside, which helps to reduce the resistance to material flow and prevent material accumulation.
[0047] When the first soot blower 5 and the second soot blower 51 are installed, their feed surfaces are arranged at a 30° angle to the horizontal plane, that is, the feed end is higher than the discharge end, forming a gravity-assisted flow guiding structure from top to bottom.
[0048] Preferably, the sootblower housing is welded from heat-resistant and wear-resistant steel plate, which can withstand long-term high temperatures of over 400°C and material scouring environments, ensuring its service life. Meanwhile, it is equipped with detachable flange plates on its sides, such as the first detachable flange plate 52 and the second detachable flange plate 53, facilitating periodic opening for internal cleaning, descaling, or wear inspection, ensuring long-term reliable operation of the equipment.
[0049] Based on the above embodiments, both the first high-pressure air duct 6 and the second high-pressure air duct 61 are connected to an air compressor to provide high-pressure air with a pressure range of 0.5-0.6 MPa.
[0050] Specifically, both the first high-pressure air duct 6 and the second high-pressure air duct 61 are connected to an air compressor to introduce clean, dry compressed air as a power source. The working pressure range of the high-pressure air is 0.5–0.6 MPa, and the duct diameter is preferably 25 mm. This ensures that a high-speed airflow with sufficient velocity is formed inside the first soot blower 5 and the second soot blower 51, effectively pushing the accumulated material into the return pipe and achieving stable and continuous pneumatic conveying.
[0051] Based on the above embodiments, see Figure 5 The material hopper 1 has a truncated pyramidal structure with an upper base of 2400mm in length and 350mm in width, which matches the discharge port of the rotary kiln's feeding hopper and is used to fully receive the material falling from the feeding end of the kiln. The lower base has a length of 341mm and a width of 350mm, which facilitates the centralized discharge of materials. The overall height is 1024mm, and it is welded from heat-resistant steel plates with a thickness of not less than 10mm, which has sufficient structural strength and high temperature resistance.
[0052] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.
[0053] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.
Claims
1. A clog prevention device for a rotary kiln for calcining alumina, characterized in that, include: The material hopper (1) is located below the material feeding hopper of the rotary kiln (2) and is used to collect accumulated material. The discharge pipe (11) is connected to the lower outlet of the silo (1); The slag removal box (3) is vertically connected to the discharge pipe (11) and is equipped with a grate (31) for crushing materials. The material recovery unit includes a soot blower, a discharge pipe, a high-pressure air pipe and a return pipe. The soot blower is connected to the slag removal box (3) through the discharge pipe. The high-pressure air pipe is connected to the soot blower. The return pipe is connected between the soot blower and the kiln tail flue of the rotary kiln (2).
2. The anti-clogging device for a rotary kiln for calcining alumina according to claim 1, characterized in that, The material recycling unit includes a first material recycling unit and a second material recycling unit; The first material recycling unit includes a first discharge pipe (4), a first soot blower (5) connected in sequence, and a first high-pressure air pipe (6) and a first return pipe (7) respectively connected to the first soot blower (5); The second material recovery unit includes a second discharge pipe (41), a second soot blower (51) connected in sequence, and a second high-pressure air pipe (61) and a second return pipe (71) respectively connected to the second soot blower (51).
3. The anti-clogging device for the rotary kiln for calcining alumina according to claim 1, characterized in that, The slag removal box (3) has a rectangular box structure, and the grate (31) is inclinedly arranged inside the slag removal box (3).
4. The anti-clogging device for a rotary kiln for calcining alumina according to claim 3, characterized in that, A cleaning valve (32) is provided on the side wall of the slag removal box (3).
5. The anti-clogging device for a rotary kiln for calcining alumina according to claim 4, characterized in that, The bottom of the slag removal box (3) is provided with a discharge pipe (33).
6. The anti-clogging device for a rotary kiln for calcining alumina according to claim 2, characterized in that, Both the first discharge pipe (4) and the second discharge pipe (41) are equipped with switch valves (43).
7. The anti-clogging device for a rotary kiln for calcining alumina according to claim 2, characterized in that, Both the first soot blower (5) and the second soot blower (51) are arc-shaped structures and are set at an angle.
8. The anti-clogging device for a rotary kiln for calcining alumina according to claim 2 or 7, characterized in that, The first soot blower (5) and the second soot blower (51) are respectively provided with a first detachable flange plate (52) and a second detachable flange plate (53) on their side walls.
9. The anti-clogging device for a rotary kiln for calcining alumina according to claim 2, characterized in that, The first high-pressure air duct (6) and the second high-pressure air duct (61) are both connected to an air compressor to provide high-pressure air with a pressure range of 0.5-0.6 MPa.
10. The anti-clogging device for a rotary kiln for calcining alumina according to claim 1, characterized in that, The material storage bin (1) has a truncated pyramidal structure.