Fluidized material conveying system and process

Abstract

This invention relates to a fluidized material conveying system and process, belonging to the field of suspension fluidized roasting technology in metallurgy and mineral processing. It includes a storage silo, a weighing scale, a discharge chute, a fluidized feeding device, and a venturi. Powdered material is weighed by the weighing scale below the storage silo and fed into the discharge chute. From the discharge chute, it is fed into the fluidized feeding device and then into the venturi, completing the material conveying process. Compared to screw feeders, the fluidized material conveying device has a simpler, more compact structure, smaller footprint, lower investment cost, smaller size, lighter weight, and requires less investment. It also eliminates the need for an electrical drive unit. The fluidized feeding device employs a conical hopper + reduced-diameter pipe design to form a material seal, preventing excessive air from entering the negative pressure system and causing a short circuit. In industrial production, this can significantly improve production efficiency and reduce costs.

Description

Technical Field

[0001] This invention belongs to the field of suspension fluidized roasting technology in metallurgy and mineral processing, specifically a fluidized material conveying system and process. Background Technology

[0002] Screw feeders are common conveying equipment widely used in power plants, mines, metallurgy, dust removal, cement, and other industries to transport granular materials such as coal powder, mineral powder, and dust. The main components of a screw feeder include the inlet, screw blades, outlet, and transmission device. When material enters the screw blades from the inlet, the screw blades propel the material forward and simultaneously lift it upward, ultimately conveying it to the outlet. The rotational speed and direction of the screw blades can be controlled by the transmission device. Currently, in the industrial applications of alumina and refractory iron ore suspension magnetization roasting, screw feeders are primarily used to transport bulk solid materials.

[0003] The advantages of screw feeders lie in their large conveying capacity and adjustable conveying speed. However, they also have significant drawbacks. Firstly, the complex structure of the screw blades makes them prone to clogging and jamming, requiring regular maintenance. Secondly, the frictional contact between the screw blades and powdery minerals leads to rapid wear and a short service life, especially when conveying iron ore powder with relatively coarse particle size, high bulk density, and high hardness in metallurgical beneficiation systems, resulting in high equipment maintenance costs. Furthermore, screw feeders are custom-designed and manufactured according to the properties of the material and conveying requirements (e.g., using stainless steel to convey corrosive materials, or using special materials for screw blades to convey harder granular materials), and most require frequency conversion adjustment, leading to high investment and construction costs. Summary of the Invention

[0004] To address the shortcomings of the feeding device in a suspension magnetized roasting furnace, this invention provides a fluidized material conveying system and process.

[0005] A fluidized material conveying system includes a storage silo, a weighing scale, a discharge chute, a fluidized feeding device, and a venturi; the fluidized feeding device includes a conical hopper + a reduced-diameter pipe unit, a discharge pipe, and a pipeline compressed air fluidization unit.

[0006] Furthermore, the storage bin, weighing scale, discharge chute, and conical hopper + reducer unit are connected in sequence. The conical hopper + reducer unit is connected to the pipeline compressed air fluidization unit through the discharge pipe. The pipeline compressed air fluidization unit at the discharge end of the discharge pipe is connected to the Venturi.

[0007] Furthermore, the fluidized feeding device includes a conical hopper and a reduced-diameter pipe unit. The conical hopper and reduced-diameter pipe design is used to form a material seal to prevent excessive air from entering the negative pressure system and causing a short circuit.

[0008] Furthermore, the conical hopper is at an angle of not less than 70° relative to the horizontal direction, and the reduced-diameter tube is placed at a 90° angle perpendicular to the horizontal direction.

[0009] Furthermore, the feed pipe is configured at an angle of not less than 60° to the horizontal direction to enter the venturi. This large angle ensures that the material falls smoothly, continuously, and stably into the venturi by its own weight.

[0010] Furthermore, the compressed air fluidization unit consists of multiple rows of compressed air pipes. A compressed air pipe perpendicular to the feed pipe is installed where the feed pipe cuts into the venturi. Within a 180° semicircle along the lower half of the feed pipe's axis, perpendicular to the feed pipe at its upper and lower edges, compressed air pipes are arranged radially at 45° intervals. The compressed air pipes have a diameter of DN15 and a pressure of not less than 0.6 MPa. The multiple rows of compressed air evenly distribute the material with a certain amount of moisture into the venturi. Under the action of negative pressure preheating flue gas, the material is carried into the next process, preventing a large amount of material from falling into the venturi along the inner wall of the pipe, thus avoiding material spillage and flue blockage that could lead to system shutdown.

[0011] Furthermore, the compressed air required by the fluidized feeder is supplied by the compressed air pipe in the suspension magnetization roasting furnace area.

[0012] Furthermore, the feed tube and the reducing tube are made of 304 stainless steel.

[0013] A fluidized material conveying process, employing the aforementioned fluidized material conveying device, is described in the following details:

[0014] The powdered material is weighed by a weighing scale below the storage silo and then fed into a discharge chute. From the discharge chute, it is fed into the fluidized feeder and then into the venturi, thus completing the material conveying process.

[0015] Furthermore, the moisture content of the powdered material is <11% and the particle size is <1mm.

[0016] The beneficial effects of this invention are:

[0017] Compared to screw feeders, fluidized bed material conveying devices have a simpler and more compact structure, smaller footprint, lower investment cost, smaller size, lighter weight, and require no electrical drive unit. The fluidized bed feeding device uses a conical hopper + reduced diameter pipe design to form a material seal, preventing excessive air from entering the negative pressure system and causing a short circuit. In industrial production, this can greatly improve production efficiency and reduce costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the process and structure of a fluidized material conveying device according to the present invention;

[0019] Figure 2 This is a detailed view of the conical hopper + reduced diameter pipe unit in the fluidized material conveying device of the present invention;

[0020] Figure 3 This is a detailed view of the compressed air pipe in the fluidized material conveying device of the present invention;

[0021] The components include: 1. Storage silo, 2. Measuring scale, 3. Discharge chute, 4. Conical hopper + reduced diameter pipe unit, 5. Pipeline compressed air fluidization unit, and 6. Venturi. Detailed Implementation

[0022] To facilitate understanding of the present invention, a more comprehensive description of the invention will be given below with reference to the accompanying drawings, and several embodiments of the invention will be provided. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be more thorough and complete.

[0023] A fluidized material conveying system, such as Figure 1 As shown, it includes a storage bin (1), a weighing scale (2), a discharge chute (3), a fluidized bed feeder and a venturi (6);

[0024] The fluidized feeding device includes a conical hopper + reduced diameter pipe unit (4), a discharge pipe, and a pipeline compressed air fluidization unit (5);

[0025] The storage bin (1), weighing scale (2), discharge chute (3), and conical hopper + reducer pipe unit (4) are connected in sequence. The conical hopper + reducer pipe unit (4) is connected to the pipeline compressed air fluidization unit (5) through the discharge pipe. The pipeline compressed air fluidization unit (5) at the discharge end of the discharge pipe is connected to the Venturi (6). The relative roughness of the discharge pipe and the reducer pipe meets the relevant standards and is required to be flat and smooth.

[0026] The fluidized feeding device includes a conical hopper + reduced diameter pipe unit (4), which adopts the design of conical hopper + reduced diameter pipe to form a material seal to prevent excessive air from entering the negative pressure system and causing a short circuit.

[0027] like Figure 2 As shown, the conical hopper is at an angle of not less than 70° relative to the horizontal direction, and the reduced-diameter pipe is placed at a 90° angle perpendicular to the horizontal direction.

[0028] The feed pipe is configured at an angle of not less than 60° to the horizontal direction to enter the Venturi (6). The large angle can ensure that the material falls smoothly, continuously and stably into the Venturi (6) by its own weight.

[0029] like Figure 3As shown, the pipeline compressed air fluidization unit (5) consists of multiple rows of compressed air pipes. A compressed air pipe perpendicular to the feed pipe is set at the point where the feed pipe cuts into the venturi (6). Within the range where the feed pipe cuts into the venturi (6) at the upper and lower edges and is perpendicular to the feed pipe, a radially arranged compressed air pipe is set every 45° along the lower semicircle of the material along the axis. The compressed air pipe diameter is DN15 and the pressure is not less than 0.6MPa. The multiple rows of compressed air will evenly throw the material with a certain amount of moisture into the venturi (6). Under the action of the negative pressure preheated flue gas, the material is carried into the next process, avoiding a large amount of material falling into the venturi (6) along the inner side of the pipe wall, which would cause material drop and flue blockage, leading to system shutdown.

[0030] The compressed air required by the fluidized feeder is supplied by the compressed air pipe in the suspension magnetization roasting furnace area.

[0031] The feed pipe and the reducing pipe are made of 304 stainless steel.

[0032] A fluidized material conveying process, employing the aforementioned fluidized material conveying device, is described in the following details:

[0033] Powdered materials with a moisture content of <11% and a particle size of <1m are weighed by a weighing scale (2) below the storage silo (1) and fed into a feeding chute (3). The material is then fed into the fluidized feeding device and then into the venturi (6) to complete the material conveying.

Claims

1. A fluidized material conveying system, characterized in that, This includes storage silos, weighing scales, feeding chutes, fluidized bed feeders, and venturi systems; The fluidized feeder includes a conical hopper + reduced diameter pipe unit, a discharge pipe, and a pipeline compressed air fluidization unit; The storage bin, weighing scale, discharge chute, and conical hopper + reducer unit are connected in sequence. The conical hopper + reducer unit is connected to the pipeline compressed air fluidization unit through the discharge pipe. The pipeline compressed air fluidization unit at the discharge end of the discharge pipe is connected to the Venturi. The fluidized feeder includes a conical hopper and a reduced-diameter pipe unit, and the conical hopper and reduced-diameter pipe design is used to form a material seal; The angle between the conical hopper and the horizontal direction is not less than 70°, and the reduced diameter tube is placed at a 90° angle perpendicular to the horizontal direction. The compressed air fluidization unit consists of multiple rows of compressed air pipes. A compressed air pipe perpendicular to the feed pipe is installed at the point where the feed pipe cuts into the venturi. Within a 180° semicircle along the lower half of the feed pipe, which is perpendicular to the feed pipe at the upper and lower edges, compressed air pipes are arranged radially at 45° intervals. The diameter of the compressed air pipe is DN15, and the pressure is not less than 0.6MPa.

2. The fluidized material conveying system according to claim 1, characterized in that, The feed pipe is configured at an angle of not less than 60° to the horizontal direction to enter the venturi.

3. The fluidized material conveying system according to claim 1, characterized in that, The compressed air required by the fluidized feeder is supplied by the compressed air pipe in the suspension magnetization roasting furnace area.

4. The fluidized material conveying system according to claim 1, characterized in that, The feed pipe and the reducing pipe are made of 304 stainless steel.

5. A fluidized material conveying process, employing the fluidized material conveying system according to any one of claims 1-4, wherein the specific process is as follows: The powdered material is weighed by a weighing scale below the storage silo and then fed into a discharge chute. From the discharge chute, it is fed into the fluidized feeder and then into the venturi, thus completing the material conveying process.

6. The fluidized material conveying process according to claim 5, characterized in that, The moisture content of the powdered material is <11%, and the particle size is <1mm.

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