A preheating cyclone with cloth device for roasting furnace

Abstract

This application relates to the technical field of gas suspension flash roasting furnace equipment, specifically to a preheating cyclone for a roasting furnace with a material distribution device. It includes a cyclone and a material distribution device on the side wall of the cyclone. The lower surface of the material distribution device slopes downwards, forming an angle with the side wall of the cyclone. The projected length of the lower surface extending into the cyclone is 80-120mm. The cyclone and the material distribution device are integrally formed, both made of castable refractory. The angle formed by the portion of the lower surface of the material distribution device extending into the cyclone and the vertical direction is at least 10° larger than the angle formed by the portion outside the cyclone and the side wall of the cyclone. This invention uses integral casting to avoid the problem of material detachment due to different expansion coefficients caused by different materials. Furthermore, extending the material distribution device approximately 100mm into the cyclone enhances the overall air-material interaction, ensuring thorough mixing of the material and gas, and achieving sufficient preheating, thus reducing roasting energy consumption.

Description

Technical Field

[0001] This utility model relates to the technical field of gas suspension flash roasting furnace equipment, specifically to a preheating cyclone tube for a roasting furnace with a material feeding device. Background Technology

[0002] In alumina production, the gas suspension flash roaster is a crucial piece of equipment. It dries, dehydrates, and transforms the filtered, qualified aluminum hydroxide through its drying, roasting, and cooling sections, converting it into alumina. Compared to rotary kilns, it offers advantages such as smaller footprint, higher heat utilization, more stable product quality, and lower maintenance costs. In the gas suspension flash roaster process, aluminum hydroxide is produced by air-powered preheating, roasting, and cooling within multiple cyclones. The separation and material distribution within the preheating cyclones are critical for the efficient operation of the roaster. Currently, most gas suspension flash roasters use stainless steel for the material distribution device at the cyclone outlet. However, stainless steel has a different coefficient of thermal expansion than the surrounding castable material, making it prone to detachment when heated.

[0003] Therefore, it is necessary to develop a preheating cyclone for roasting furnaces with a long service life and low failure rate to improve production efficiency. Utility Model Content

[0004] To address the problems of existing technologies, this utility model proposes a cyclone separator for a roasting furnace with a feeding device, the specific solution of which is as follows:

[0005] A preheating cyclone for a roasting furnace with a material-feeding device includes: a cyclone and a material-feeding device on the side wall of the cyclone. The lower part of the cyclone is an inverted conical structure, and the upper part is a cylindrical structure. The material-feeding device is a box structure. The lower surface of the box is inclined downward, forming an angle greater than 30° and less than 80° with the outer wall of the cyclone. The lower surface extends into the cyclone, and the horizontal projection length of the lower surface extending into the cyclone is 80-120mm. The top surface of the material-feeding device is not higher than the upper edge of the cyclone. A material inlet is opened on the top surface of the material-feeding device and connected to a cylindrical material discharge pipe. The cyclone and the material-feeding device are integrally formed and are both made of castable refractory. The angle formed by the portion of the lower surface of the material-feeding device extending into the cyclone and the vertical direction is less than 90°, and is at least 10° larger than the angle formed by the portion outside the cyclone and the side wall of the cyclone.

[0006] Furthermore, the angle formed between the lower surface of the housing and the outer wall of the cyclone is greater than 45° and less than 80°.

[0007] Furthermore, the horizontal projection length of the lower surface of the housing extending into the cyclone is 100mm.

[0008] Furthermore, the top surface of the fabric-making device is flush with the upper edge of the cyclone.

[0009] Furthermore, the top and bottom surfaces of the fabric feeding device are parallel and both tilted downwards, and the feeding pipe is vertical and parallel to the cyclone.

[0010] Furthermore, the cyclone and the fabric distribution device are integrally formed and made of aluminum silicate castable.

[0011] The beneficial effects of this utility model are as follows: By improving the material of the cyclone separator material distribution device in the roasting furnace, this utility model uses castable refractory for integral molding, avoiding the problem of detachment due to different expansion coefficients caused by different materials. This extends the service life of the material distribution device in the roasting furnace cyclone separator, effectively reducing the number of production failures caused by material distribution device detachment in the gas suspension flash roasting furnace, and improving the effective operating rate of the roasting furnace. Furthermore, the material distribution device is extended into the cyclone separator by about 100mm, achieving a stronger overall air-material interaction effect, ensuring thorough mixing of material and gas, and sufficient preheating. This further reduces the temperature difference between the main furnace and the hot cyclone separator by 33%, increases the preheated air temperature by 5℃, and can reduce the main furnace temperature by 5℃-10℃ while ensuring product quality, thereby also achieving the goal of reducing roasting energy consumption. Attached Figure Description

[0012] The embodiments of this utility model will be further described below with reference to the accompanying drawings, wherein:

[0013] Figure 1 A schematic diagram of the structure of a roasting furnace cyclone with a feeding device according to an embodiment of the present invention is shown;

[0014] Figure 2 A schematic diagram illustrating the working principle of the embodiment is shown. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0016] In one embodiment, such as Figure 1As shown, a preheating cyclone for a roasting furnace with a material distribution device includes: a cyclone 1 and a material distribution device 2 on the side wall of the cyclone 1. The lower part of the cyclone 1 is an inverted conical structure 11, and the upper part is a cylindrical structure 12. The material distribution device 2 is a box structure. The lower surface 21 of the box is inclined downward. The angle between the part outside the cyclone 1 and the outer side wall of the cyclone 1 is 60°. The lower surface 21 extends into the cyclone 1. The projected length of the lower surface 21 extending into the cyclone 1 is 100mm. The top surface of the material distribution device 2 is flush with the upper edge of the cyclone 1. A material inlet is opened on the top surface of the material distribution device 2 and a cylindrical feeding pipe 3 is connected to it. The cyclone 1 and the material distribution device are integrally formed and are both made of aluminum silicate castable. The angle between the part of the lower surface 21 of the material distribution device extending into the cyclone 1 and the vertical direction is 80°.

[0017] Its manufacturing process includes removing the original fabrication device, welding anchors, setting up the mold according to the dimensions, mixing the casting material according to the proportion, adding the casting material and vibrating to compact it, and heating the cast fabrication device according to the oven heating curve.

[0018] (1) Clean up and prepare the construction site, including removing debris, measuring and marking relevant positions and dimensions, etc.

[0019] (2) Install wooden templates and hooks according to design requirements and dimensions to fix the shape and size of the castable.

[0020] (3) According to the design formula, mix the casting material and an appropriate amount of water evenly.

[0021] (4) Pour the prepared casting material into the template and use a vibrator to make the casting material fully fill the gaps in the template.

[0022] (5) After the casting material has solidified to a certain extent, use a leveling tool to trim the casting surface so that its surface forms a raised arc shape and is flat and smooth.

[0023] (6) After the castable has completely solidified, remove the formwork and inspect the casting surface to ensure that its quality and shape meet the design requirements.

[0024] (7) The temperature is slowly increased according to the 36-hour oven drying curve to increase the density and crack resistance of the castable.

[0025] The foregoing description describes some exemplary embodiments of this utility model. It is understood that the above embodiments are only used to explain this utility model and do not constitute a limitation on the scope of protection of this utility model. The features in these embodiments can be recombine in a suitable manner, and the resulting solutions are still within the scope of protection claimed by this utility model. Based on the above embodiments, all other embodiments obtained by those skilled in the art without inventive effort, that is, all modifications, equivalent substitutions, and improvements made within the spirit and principles of this application, fall within the scope of protection claimed by this utility model.

Claims

1. A preheating cyclone of a roasting furnace with cloth means, characterized in that, include: The cyclone (1) and the fabric distribution device (2) on the side wall of the cyclone are described. The lower part of the cyclone is an inverted conical structure (11), and the upper part is a cylindrical structure (12). The fabric distribution device (2) is a box structure. The lower surface (21) of the box is inclined downwards, forming an angle greater than 30° and less than 80° with the outer wall of the cyclone. The lower surface (21) extends into the cyclone (1), and the horizontal projection length of the lower surface (21) extending into the cyclone (1) is 80-12 mm. 0mm, the top surface of the fabric distribution device (2) is not higher than the upper edge of the cyclone (1), the top surface of the fabric distribution device (2) is provided with an inlet and connected to a cylindrical discharge pipe (3), the cyclone and the fabric distribution device are integrally formed and are made of castable material; the part of the lower surface (21) of the fabric distribution device extending into the cyclone (1) forms an angle of less than 90° with the vertical direction, and is at least 10° larger than the angle formed by the part outside the cyclone (1) and the side wall of the cyclone.

2. A preheating cyclone for a roasting furnace with cloth installation according to claim 1, characterized in that, The angle between the lower surface of the housing and the outer wall of the cyclone is greater than 45° and less than 80°.

3. A preheating cyclone for a roasting furnace with cloth installation according to claim 1, characterized in that, The horizontal projection length of the lower surface of the housing extending into the cyclone is 100mm.

4. A preheating cyclone for a roasting furnace with cloth installation according to claim 1, characterized in that, The top surface of the fabric device (2) is flush with the upper edge of the cyclone (1).

5. A preheating cyclone for a roasting furnace with cloth installation according to claim 1, characterized in that, The top and bottom surfaces of the fabric feeding device (2) are parallel and inclined downwards, and the feeding pipe (3) is vertical and parallel to the cyclone (1).

6. A preheating cyclone for a roasting furnace with cloth installation according to claim 1, characterized in that, The cyclone and the fabric distribution device are integrally formed and made of aluminum silicate castable.

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