A device for preventing material from being discharged from a material box exhaust pipe during material feeding of an electrolytic cell

Abstract

This utility model discloses a device for preventing material from being carried into the exhaust pipe of the material box during the feeding of an electrolytic cell. The device includes an exhaust pipe vertically installed on the exhaust port of the material box. The exhaust pipe comprises an inner pipe and an outer pipe, which are nested together. Several C-shaped damping plates are spirally arranged at intervals between the inner and outer pipes. This utility model has a simple structure, low cost, and flexible operation. It effectively solves the problem of a large amount of alumina and gas escaping from the exhaust pipe during the conveying of the ultra-dense alumina phase in an electrolytic cell, resulting in a large accumulation of alumina on the shell surface. This greatly reduces the workload of operators in transporting alumina and also solves problems such as furnace wall melting, rapid anode explosion, electrode delamination, reduced primary aluminum quality, and decreased current efficiency caused by excessively thick insulation layers in the electrolytic cell. It effectively reduces the safety risk of burns to operators handling hot alumina on the shell surface and has good economic practicality.

Description

Technical Field

[0001] This utility model relates to the technical field of electrolytic aluminum production equipment, and in particular to a device for preventing material from being carried out of the exhaust pipe of the material box during the feeding of the electrolytic cell. Background Technology

[0002] The current feeding method for domestic electrolytic cells is ultra-dense phase conveying, which utilizes the fluidization characteristics of alumina particles. The equipment for ultra-dense phase conveying includes sluices, air supply pipes, variable frequency centrifugal fans, and a control system. The sluice consists of a material flow layer, a permeable cloth layer, an air chamber layer, and a balancing column. The main principle is that when air is pressurized by the variable frequency centrifugal fan, it passes through the air supply pipe to the air chamber of the sluice, through the permeable cloth to the material flow layer, filling the gaps in the powdery material layer. When the airflow reaches a certain velocity, the original balance between the powdery particles is broken, and their volume increases while their density decreases. The internal friction between particles and the friction angle with the sluice wall approach zero, thus fluidizing the powdery material. Utilizing this characteristic of the powdery material, and combined with the valves in the sluice's air supply pipe to regulate the pressure of each sluice section and create a pressure difference, the upper balancing column expels excess gas, and the material flows from the high-pressure sluice to the low-pressure sluice.

[0003] However, due to differences in design, manufacturing, installation, process, materials, and operation, during the conveying of the ultra-dense alumina phase in the electrolytic cell, a large amount of alumina and gas are discharged from the exhaust pipe of the material box during the feeding process. This results in a large amount of alumina accumulating on the surface of the electrolytic cell shell. This can easily cause the alumina insulation layer on the surface of the electrolytic cell shell to be too thick and in a hot state, causing the furnace walls to melt, the anode to explode rapidly, and the electrode to de-electrode. This affects the quality of the primary aluminum, reduces the current efficiency, and may even lead to the formation of defective cells.

[0004] Therefore, a device is proposed to prevent material from being carried into the exhaust pipe of the material box during the feeding of the electrolytic cell. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a device for preventing material from being carried into the exhaust pipe of the material box during the feeding of the electrolytic cell.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A device for preventing material from being carried out of the vent pipe of the material box during the feeding of an electrolytic cell includes: an vent pipe, which is vertically installed on the vent hole of the material box, the vent pipe including an inner pipe and an outer pipe, the inner pipe and the outer pipe being nested together, and a plurality of C-shaped damping plates are spirally arranged at intervals between the inner pipe and the outer pipe.

[0008] There are four C-shaped damping plates, arranged spirally upwards at intervals, and the vertical projection of the four C-shaped damping plates forms a ring.

[0009] The inner tube has a diameter of 80mm, the outer tube has a diameter of 130mm, the C-shaped damping plate has a thickness of 1mm, the horizontal tilt angle of the C-shaped damping plate is 30°, and the height of the exhaust pipe is 750mm.

[0010] This utility model also includes an extension tube, which is vertically installed inside the material box through the exhaust hole of the material box, and the top air outlet is connected to the exhaust pipe.

[0011] The length of the extension tube is 100-150mm.

[0012] The beneficial effects of this utility model are: the utility model has a simple structure, low cost, and flexible operation. It can effectively solve the problem of a large amount of alumina and gas being discharged from the exhaust pipe of the material box during the ultra-dense phase transportation of alumina in the electrolytic cell, resulting in a large amount of alumina accumulating on the shell surface. This greatly reduces the workload of operators in transporting alumina. It also solves the problems of furnace wall melting, anode explosion, depolarization, reduced primary aluminum quality, and decreased current efficiency caused by excessively thick insulation layer in the electrolytic cell. It can effectively reduce the safety risk of burns to operators when transporting hot alumina on the shell surface and has good economic practicality. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the C-shaped damping plate of this utility model;

[0016] Figure 3 yes Figure 2 AA sectional view. Detailed Implementation

[0017] 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 specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0018] like Figures 1 to 3As shown, a device for preventing material from being carried into the exhaust pipe of an electrolytic cell during material feeding includes: an exhaust pipe 1, vertically installed on the exhaust hole of a material box 6; the exhaust pipe 1 includes an inner pipe 4 and an outer pipe 5, which are nested together; a plurality of C-shaped damping plates 3 are spirally arranged upwards between the inner pipe 4 and the outer pipe 5; the inner pipe 4 has a diameter of 80 mm; the outer pipe 5 has a diameter of 130 mm; the C-shaped damping plates 3 have a thickness of 1 mm; the horizontal inclination angle of the C-shaped damping plates 3 is 30°; and the height of the exhaust pipe 1 is 750 mm.

[0019] like Figure 2 , Figure 3 As shown, there are four C-shaped damping plates 3, which are spirally arranged at intervals upwards, and the vertical projection of the four C-shaped damping plates 3 forms a ring.

[0020] like Figure 1 As shown, this utility model also includes an extension tube 2, which is vertically installed inside the material box 6 through the exhaust hole of the material box 6. The top air outlet is connected to the exhaust pipe 1, and the length of the extension tube 2 is 100-150mm.

[0021] In use, when the ultra-dense phase conveying alumina enters the hopper 6, the alumina material and a pressurized gas enter the hopper 6 together. Because the exhaust port is equipped with an extension pipe 2, the gas will not be discharged directly from the exhaust port, but will instead flow downwards and then enter the extension pipe 2, thus reducing the gas flow rate. Subsequently, small particles in the gas enter the exhaust pipe 1 along with the gas through the extension pipe 2 and continue to rise. When they encounter the C-shaped damping plate 3, the gas pressure decreases with the increase of height and the number of C-shaped damping plates 3. The small alumina particles fall into the hopper 6 under the action of gravity, so that the gas discharged at the end does not contain small alumina particles. The extension pipe 2 also has a design effect: when the material level in the hopper 6 rises above the extension pipe 2, the extension pipe 2 will prevent alumina and pressurized gas from entering the hopper due to the blockage of the exhaust port. At this time, the hopper stops feeding.

[0022] The inner tube 4 has a diameter of 80mm, the outer tube 5 has a diameter of 130mm, the C-shaped damping plate 3 has a thickness of 1mm, the horizontal inclination angle of the C-shaped damping plate 3 is 30°, and the height of the exhaust pipe 1 is 750mm. The purpose of these designs is to reduce the gas flow rate and reduce the gas pressure, while also making it easier for small alumina particles to settle.

[0023] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A device for preventing material from being carried into the exhaust pipe of the material box during the conveying of materials in an electrolytic cell, characterized in that, include: The exhaust pipe (1) is vertically installed on the exhaust hole of the material box (6). The exhaust pipe (1) includes an inner pipe (4) and an outer pipe (5). The inner pipe (4) and the outer pipe (5) are fitted together. Several C-shaped damping plates (3) are spirally arranged between the inner pipe (4) and the outer pipe (5) at intervals.

2. The device for preventing material from being carried into the exhaust pipe of the material box during the conveying of materials in an electrolytic cell, as described in claim 1, is characterized in that, There are four C-shaped damping plates (3), which are spirally arranged at intervals upwards, and the vertical projection of the four C-shaped damping plates (3) is a ring.

3. The device for preventing material from being carried into the exhaust pipe of the material box during the conveying of materials in an electrolytic cell, as described in claim 2, is characterized in that... The inner tube (4) has a diameter of 80 mm, the outer tube (5) has a diameter of 130 mm, the C-shaped damping plate (3) has a thickness of 1 mm, the horizontal tilt angle of the C-shaped damping plate (3) is 30°, and the height of the exhaust pipe (1) is 750 mm.

4. The device for preventing material from being carried into the exhaust pipe of the material box during the conveying of materials in an electrolytic cell, as described in claim 1, is characterized in that... It also includes an extension pipe (2), which is vertically installed inside the material box (6) through the exhaust hole of the material box (6), and the top air outlet is connected to the exhaust pipe (1).

5. The device for preventing material from being carried into the exhaust pipe of the material box during the conveying of materials in an electrolytic cell, as described in claim 4, is characterized in that... The length of the extension tube (2) is 100-150mm.

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