A device for collecting flue gas from cathode square steel head during roasting of aluminum electrolytic cell

Abstract

A device for collecting flue gas from cathode square steel heads during the roasting of aluminum electrolytic cells, comprising a gas collecting hood body, a baffle, a transition pipe, a branch flexible connecting pipe, a collection flexible connecting pipe, a collection tee pipe and a branch pipe; the gas collecting hood body is formed by a plurality of gas collecting hoods tightly connected, and each gas collecting hood is composed of an outer angle plate, an inner angle plate and air holes; the baffles are arranged at both ends of the gas collecting hood body, so that the gas collecting hood body and the two baffles form a closed space, and a negative pressure cavity is formed in the gas collecting hood body; the transition pipe passes through the baffle arranged at one end of the gas collecting hood body and is connected to the negative pressure cavity; the other end of the transition pipe is connected to the branch flexible connecting pipe; the branch flexible connecting pipe is connected to the collection flexible connecting pipe through the collection tee pipe; the collection flexible connecting pipe is connected to the branch pipe. The present invention utilizes the negative pressure cavity formed between the outer angle plate and the inner angle plate of the gas collecting hood in the flue gas collection device, combined with the subsequent collection pipeline to centrally recover the flue gas, thereby avoiding the unorganized emission of flue gas during the production process.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental protection in aluminum electrolysis production, and in particular relates to a device for collecting cathode square steel head smoke during the roasting of an aluminum electrolytic cell. Background Art

[0002] During the electrolytic cell calcination, when the cathode temperature rises, a large amount of volatiles will seep out from the square steel heads of each group of cathodes on the A and B sides of the tank shell, and a large amount of smoke will be generated. The smoke will go up along the gap between the style plate and the tank edge plate and enter the electrolytic workshop, which is an unorganized emission type. It affects the working environment of the electrolytic workshop and endangers the health of employees. This phenomenon exists in all enterprises in the entire aluminum industry, and no effective and feasible solution has been found, nor is there any relevant technical solution to learn from. Summary of the invention

[0003] The purpose of the present invention is to solve the problem of unorganized emission of flue gas generated by cathode square steel heads during the roasting of an electrolytic cell, and to provide a device for collecting flue gas from cathode square steel heads during the roasting of an aluminum electrolytic cell to prevent unorganized emission of flue gas and pollute the environment.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A device for collecting flue gas from cathode square steel heads during the roasting of an aluminum electrolytic cell, the device comprising a gas collecting hood body, a baffle, a transition pipe, a branch flexible connecting pipe, a collection flexible connecting pipe, a collection tee pipe and a branch smoke pipe; wherein:

[0006] The gas collecting hood body is formed by closely connecting multiple sections of gas collecting hoods, and the gas collecting hood body is placed above the gap between the style plate bracket and the groove edge plate of the electric roasting electrolytic cell; each section of the gas collecting hood is composed of an outer angle plate, an inner angle plate and an air hole; the angles of the outer angle plate and the inner angle plate are arranged relative to each other, and the intersection is connected by welding; the air hole is opened at the intersection of the outer angle plate and the inner angle plate;

[0007] There are two baffles, which are respectively arranged at the two ends of the air collecting hood body, so that the air collecting hood body and the two baffles form a closed space, and a negative pressure cavity is formed in the air collecting hood body; the two baffles have the same size, and the size of the baffle is greater than or equal to the size of the triangle formed by the outer corner plate and the bottom surface.

[0008] The transition pipe passes through a baffle plate arranged at one end of the gas collecting hood body and is connected to the negative pressure chamber; the other end of the transition pipe is connected to the branch flexible connecting pipe; the transition pipe and the branch flexible connecting pipe are provided with two groups; the branch flexible connecting pipe is connected to the aggregate flexible connecting pipe through the aggregate three-way pipe; the aggregate flexible connecting pipe is connected to the branch cigarette pipe.

[0009] Preferably, the outer angle plate is formed by folding a rectangular cold-rolled plate along the center line, and the inner angle plate is also formed by folding a rectangular cold-rolled plate along the center line.

[0010] Preferably, both the outer angle plate and the inner angle plate are formed by folding the cold-rolled plate at a 90-degree angle along the center line.

[0011] Preferably, the size of the outer corner plate is larger than that of the inner corner plate.

[0012] Preferably, the air holes are provided in plurality and are opened at equal intervals.

[0013] Preferably, the collective flexible connecting pipe is connected to the cigarette branch pipe through a flange.

[0014] Preferably, the spacing between the air holes is 300 mm.

[0015] The present invention utilizes the negative pressure cavity formed between the outer angle plate and the inner angle plate of the gas collecting hood in the fume collecting device, and combines it with the subsequent collecting pipeline to realize the centralized recovery of the fume generated by the cathode square steel head during the roasting of the electrolytic cell, thereby avoiding the unorganized emission of fume in the production process, protecting the environment while also avoiding the harm of fume to the health of employees. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of smoke rising to the collection device of the present invention;

[0017] Figure 2 It is a schematic diagram of the installation position of the present invention;

[0018] Figure 3 It is a schematic diagram of the connection between the aggregate soft connecting pipe, the aggregate tee pipe and the branch pipe;

[0019] Figure 4 It is a partial structural schematic diagram of the gas collecting hood body of the present invention;

[0020] In the figure, 1-gas collecting hood body, 2-baffle, 3-transition pipe, 4-branch flexible connecting pipe, 5-aggregate flexible connecting pipe, 6-aggregate three-way pipe, 7-smoke pipe, 8-negative pressure chamber, 9-gas collecting hood installation position, 10-gas collecting hood, 11-baffle installation position, 12-trough edge plate, 13-trough shell, 14-cathode square steel head, 15-style plate, 16-column busbar, 101-outer angle plate, 102-inner angle plate, 103-air hole. DETAILED DESCRIPTION

[0021] Embodiments of the present invention are now described with reference to the accompanying drawings. It will be appreciated by those skilled in the art that the following embodiments are only used to illustrate the present invention and should not be considered as limiting the scope of the present invention. If no specific technology, connection relationship or condition is indicated in the embodiments, the technology, connection relationship, condition described in the literature in this field or the product specification is used. If the manufacturer of the materials, instruments or equipment used is not indicated, they are all conventional products that can be purchased.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention will be understood according to specific circumstances.

[0023] Taking the mainstream domestic 500KA electrolytic cell type as an example, two sets of gas hood bodies are made of cold-rolled steel plates (thickness 1.5mm) for each baked electrolytic cell, one set for the A and one set for the B sides. Each set of gas hood bodies consists of 7 sections of gas hoods, each section is 3 meters, with a built-in negative pressure chamber. The gas hood sections are connected with reducers and placed above the gap between the style plate bracket and the groove edge plate of the powered baked electrolytic cell.

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] See also Figure 1-4 As shown, the present invention provides a device for collecting flue gas from cathode square steel heads during the roasting of aluminum electrolytic cells, which is composed of a gas collecting hood body 1, a baffle 2, a transition pipe 3, a branch flexible connecting pipe 4, a collection flexible connecting pipe 5, a collection three-way pipe 6 and a branch smoke pipe 7; wherein,

[0026] The air collecting hood body 1 is composed of 7 air collecting hood sections 10 tightly connected; each air collecting hood section 10 is composed of an outer angle plate 101, an inner angle plate 102 and an air hole 103; the outer angle plate 101 and the inner angle plate 102 are arranged at opposite angles, and the intersection is connected by welding; the air hole 103 is opened at the intersection of the outer angle plate 101 and the inner angle plate 102; there are multiple air holes 103, and the spacing between the air holes is 300mm.

[0027] There are two baffles 2, which are respectively arranged at the two ends of the gas collecting hood body 1, so that the gas collecting hood body 1 and the two baffles 2 form a closed space, and a negative pressure chamber 8 is formed in the gas collecting hood body 1; the transition pipe 3 passes through the baffle 2 arranged at one end of the gas collecting hood body 1, and is connected with the negative pressure chamber 8; the other end of the transition pipe 3 is connected to the branch flexible connecting pipe 4; the transition pipe 3 and the branch flexible connecting pipe 4 are provided with two groups; the branch flexible connecting pipe 4 is connected to the aggregate flexible connecting pipe 5 through the aggregate tee pipe 6; the aggregate flexible connecting pipe 5 is connected to the branch pipe 7 through a flange.

[0028] Specifically, the outer corner plate 101 is a rectangular cold-rolled plate folded at a 90-degree angle along the center line, and the inner corner plate 102 is also a rectangular cold-rolled plate folded at a 90-degree angle along the center line; the size of the outer corner plate 101 is larger than that of the inner corner plate 102. Figure 4 shown.

[0029] During the production process, the flue gas generated by the cathode square steel head enters the gas collecting hood body 1 along the gap between the style plate and the groove edge plate, and then enters the pipeline composed of the transition pipe 3, the branch flexible connecting pipe 4, the collecting flexible connecting pipe 5 and the collecting three-way pipe 6, and finally enters the branch smoke pipe 7. The branch smoke pipe 7 is connected to the aluminum electrolysis flue gas dry purification system for flue gas purification. The negative pressure of the aluminum electrolysis flue gas dry purification system is used as the power source for collecting the flue gas from the cathode square steel head during roasting, so that the flue gas generated by the cathode square steel head during the roasting of the electrolytic cell is collected and enters the aluminum electrolysis flue gas dry purification system for centralized treatment.

[0030] The present invention analyzes the characteristics and distribution of smoke phenomena on site, combines the upper and lower structures of the electrolytic cell, analyzes from the aspects of construction difficulty, interference with electrolytic operation and economy, and uses the negative pressure of the flue gas purification system combined with a collection device to realize the purification and recovery of the flue gas generated by the cathode square steel head during the roasting of the electrolytic cell, so as to reduce the unorganized emission of flue gas and protect the environment.

[0031] The above disclosure is only the preferred embodiment of the present invention, which cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope of the present invention.

Claims

1. A device for collecting cathode square steel head smoke during the roasting of aluminum electrolytic cells, Features: The device is composed of a gas collecting hood body (1), a baffle (2), a transition pipe (3), a branching flexible connecting pipe (4), a collecting flexible connecting pipe (5), a collecting three-way pipe (6) and a smoke branch pipe (7); wherein: The gas collecting hood body (1) is formed by closely connecting multiple gas collecting hoods (10). The gas collecting hood body (1) is placed above the gap between the style plate bracket and the slot edge plate of the electric roasting electrolytic cell; each gas collecting hood (10) is composed of an outer angle plate (101), an inner angle plate (102) and an air hole (103); the outer angle plate (101) and the inner angle plate (102) are arranged at opposite angles, and the intersection is connected by welding; the air hole (103) is opened at the intersection of the outer angle plate (101) and the inner angle plate (102); There are two baffles (2), which are respectively arranged at the two ends of the gas collecting hood body (1), so that the gas collecting hood body (1) and the two baffles (2) form a closed space, and a negative pressure chamber (8) is formed in the gas collecting hood body (1); The transition pipe (3) passes through a baffle (2) provided at one end of the gas collecting hood body (1) and is connected to the negative pressure chamber (8); the other end of the transition pipe (3) is connected to the branch flexible connecting pipe (4); the transition pipe (3) and the branch flexible connecting pipe (4) are provided in two groups; the branch flexible connecting pipe (4) is connected to the aggregate flexible connecting pipe (5) through the aggregate tee pipe (6); the aggregate flexible connecting pipe (5) is connected to the branch cigarette pipe (7); The air holes (103) are provided in plurality and are arranged at equal intervals; The collecting flexible connecting pipe (5) is connected to the cigarette branch pipe (7) via a flange.

2. A device for collecting cathode square steel head smoke during the roasting of aluminum electrolytic cells according to claim 1, Features: The outer corner plate (101) is formed by folding a rectangular cold-rolled plate in half along the center line, and the inner corner plate (102) is also formed by folding a rectangular cold-rolled plate in half along the center line.

3. A device for collecting cathode square steel head smoke during the roasting of aluminum electrolytic cells according to claim 1, Features: The outer angle plate (101) and the inner angle plate (102) are both formed by folding a cold-rolled plate at an angle of 90 degrees along the center line.

4. A device for collecting cathode square steel head smoke during the roasting of aluminum electrolytic cells according to claim 1, Features: The size of the outer corner plate (101) is greater than the size of the inner corner plate (102).

5. A device for collecting cathode square steel head smoke during the roasting of aluminum electrolytic cells according to claim 1, Features: The spacing between the air holes (103) is 300 mm.

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