Novel flue gas collecting device for aluminum electrolysis cell

Abstract

The utility model discloses a novel flue gas collecting device for an aluminum electrolysis cell, which comprises a horizontal cover plate (3) and a covering material (7) of the electrolysis cell, a horizontal flue (5) is arranged between the horizontal cover plate (3) and the covering material (7), more than one gas collecting port (9) is arranged below the horizontal flue (5), and the positions of the gas collecting ports (9) are respectively crust breaking blanking points. According to the utility model, reaction flue gas can be effectively collected, so that only a small part of the reaction flue gas is diffused into the groove cavity; and the air volume required for collecting the flue gas is reduced, so that the purposes of energy conservation and consumption reduction are achieved. The flue gas generated by reaction can be directly pumped away, various substance components in the flue gas are purer, advanced treatment and analysis of the flue gas are facilitated, and better conditions and theoretical basis are provided for an electrolysis flue gas purification system.

Description

Technical Field

[0001] This utility model relates to the field of electrolytic cell flue gas collection technology, specifically a novel aluminum electrolytic cell flue gas collection device. Background Technology

[0002] During aluminum electrolysis production, large amounts of flue gas, including CO2, HF, SO2, and fluorine-containing dust, are emitted from the electrolytic cells. Because the actual airtightness of the electrolytic cells is difficult to achieve, the extraction volume must be increased to meet national emission standards and reduce flue gas leakage. However, a larger extraction volume leads to increased purification energy consumption, and the low concentration of carbon dioxide in the flue gas hinders subsequent centralized treatment and utilization.

[0003] In actual production, aluminum electrolysis cells require operations such as anode replacement, aluminum tapping, and shell breaking and unloading, which generate a large amount of flue gas. This flue gas diffuses unorganized within the aluminum electrolysis cell cavity. The traditional flue gas collection method involves installing a flue running through the top of the electrolysis cell to extract air from within the cell. A negative pressure is created at the main flue pipe at the end to draw the flue gas out and into the purification system. The disadvantages of this method are: ① Due to the poor sealing of the aluminum electrolysis cell, a large amount of air enters the cell cavity. When the flue collects flue gas through the collecting holes, it carries away the air as well, resulting in low collection efficiency and significant energy loss; ② The distance from each collecting port to the end of the flue is different, therefore the size of each collecting port varies. This requires continuous calculation and adjustment during the design phase, but even then, uniform gas collection at each collecting port cannot be guaranteed. Consequently, in actual production, some points may still have flue gas that has not been completely extracted.

[0004] Therefore, how to collect electrolysis flue gas efficiently and with low energy consumption is a problem that the aluminum electrolysis industry urgently needs to solve at this stage. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a novel aluminum electrolysis cell flue gas collection device that efficiently collects electrolysis flue gas with low energy consumption.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a novel aluminum electrolytic cell flue gas collection device, comprising a horizontal cover plate and a covering material for the electrolytic cell, a horizontal flue between the horizontal cover plate and the covering material, and one or more gas collection ports below the horizontal flue, the gas collection ports being located at the shell-breaking and feeding points; the gas collection ports encompass the shell-breaking hammer and the feeding pipe above the shell-breaking hammer, and are inserted downward into the covering material between the two anodes; a blowpipe is inserted into the horizontal flue.

[0007] The lower part of the feeding pipe is located inside the air collection port, and the upper part of the feeding pipe is connected to the feeding cylinder. The upper and lower parts are connected by an insulating sleeve.

[0008] Insulating material is provided between the horizontal flue and the horizontal cover plate.

[0009] The horizontal width of the gas collection port is 160mm~200mm.

[0010] The longitudinal length of the gas collecting port is 110~125mm.

[0011] The horizontal flue is connected to the main flue, and a negative pressure device is installed on the main flue.

[0012] The beneficial effects of this utility model are as follows: Compared with the prior art, this utility model provides a new approach to collecting flue gas from electrolytic cells. In the aluminum electrolysis industry, a large amount of toxic flue gas is generated during the reaction. Collecting it at the reaction site improves the efficiency of flue gas collection and greatly reduces the ventilation volume required for flue gas collection, thereby achieving the effect of energy saving and consumption reduction.

[0013] This invention reduces the amount of exhaust air required for flue gas collection, thereby reducing the heat carried away by the flue gas. This reduces the heat loss of the aluminum electrolysis cell itself, resulting in better energy saving. It also provides room for optimization of the thermal balance of the electrolysis cell in the future.

[0014] This invention directly collects and extracts the high-temperature flue gas generated by the reaction. The flue gas has a higher temperature, providing a better heat source or thermal energy for the subsequent development of flue gas waste heat utilization.

[0015] This invention can directly remove the flue gas produced by the reaction, and the various substances in the flue gas are purer, which is conducive to the in-depth processing and analysis of the flue gas, and provides better conditions and theoretical basis for the electrolytic flue gas purification system. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings:

[0017] Figure 1 This is a partial longitudinal schematic diagram of the horizontal flue and gas collection port position of the aluminum electrolysis cell according to an embodiment of the present invention;

[0018] Figure 2 This is a partial lateral view of the horizontal flue and gas collection port positions of the aluminum electrolysis cell in an embodiment of this utility model.

[0019] In the diagram, 1 is the insulation device, 2 is the feeding cylinder, 3 is the horizontal cover plate, 4 is the insulation sleeve, 5 is the horizontal flue, 6 is the feeding pipe, 7 is the covering material, 8 is the anode, 9 is the gas collecting port, 10 is the shell-breaking hammer, and 11 is the blowpipe. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0021] The technical solution of this utility model will be described in detail below with specific embodiments. The following specific embodiments can be selected to be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments. Example

[0022] like Figures 1 to 2 As shown, this utility model provides a novel aluminum electrolysis cell flue gas collection device, including a horizontal cover plate 3 and a covering material 7 for the electrolysis cell. A horizontal flue 5 is provided between the horizontal cover plate 3 and the covering material 7, and one or more gas collection ports 9 are provided below the horizontal flue 5. The gas collection ports 9 are located at the shell-breaking and feeding points. Collecting flue gas at the shell-breaking and feeding points is more targeted and has lower energy consumption. The number of shell-breaking and feeding points for each aluminum electrolysis cell depends on the different cell types, but is generally 6.

[0023] The gas collecting port 9 encompasses the shell-breaking hammer 10 and the feeding pipe 6 above the shell-breaking hammer 10, and is inserted downwards into the covering material 7 between the two anodes 8. This completely encloses the flame hole for shell-breaking and feeding, so most of the flue gas generated by the reaction can be drawn away by the horizontal flue 5.

[0024] The lower part of the feeding pipe 6 is located inside the air collection port 9, and the upper part of the feeding pipe 6 is connected to the feeding cylinder 2. The upper and lower parts are connected by an insulating sleeve 4.

[0025] An insulating material 1 is provided between the horizontal flue 5 and the horizontal cover plate 3. The insulating material 1 needs to have high temperature resistance and high compressive strength. The operating temperature of the insulating material 1 should not be lower than 400℃ and the compressive strength should not be lower than 100MPa.

[0026] A blowpipe 11 is inserted into the horizontal flue 5. If dust accumulates, a temporary gas supply point can be connected to purge it.

[0027] The gas collecting port 9 has a horizontal width of 160mm~200mm and a vertical length of 110~125mm, which can completely cover the shell-beating hammer head 10 and correspond to the center seam size of the anode 8 of the aluminum electrolysis cell.

[0028] The horizontal flue 5 is connected to the main flue, and a negative pressure device is installed on the main flue to facilitate the increase of flue gas discharge rate.

[0029] Each gas collecting port 9 completely covers the fire hole of the aluminum electrolysis cell. Most of the fumes generated during the shelling and feeding process can be collected by the gas collecting ports. However, some fumes will still be discharged into the aluminum electrolysis cell cavity and exit through the original flue. Therefore, the original flue cannot be closed. But the original air volume requirement can be reduced. The optimized air volume requirement is about 10% to 15% of the original air volume requirement, which can greatly reduce the fan power of the purification system and achieve energy saving and consumption reduction. Example

[0030] This invention provides a novel aluminum electrolysis cell flue gas collection device, comprising a horizontal cover plate 3 and a covering material 7 for the electrolysis cell. A horizontal flue 5 is provided between the horizontal cover plate 3 and the covering material 7, and one or more gas collection ports 9 are provided below the horizontal flue 5. The gas collection ports 9 are located at the shell-breaking and feeding points. Collecting flue gas at the shell-breaking and feeding points is more targeted and consumes less energy. The number of shell-breaking and feeding points for each aluminum electrolysis cell depends on the different cell types, but is generally six.

[0031] The gas collecting port 9 encompasses the shell-breaking hammer 10 and the feeding pipe 6 above the shell-breaking hammer 10, and is inserted downwards into the covering material 7 between the two anodes 8. This completely encloses the flame hole for shell-breaking and feeding, so most of the flue gas generated by the reaction can be drawn away by the horizontal flue 5.

[0032] The lower part of the feeding pipe 6 is located inside the air collection port 9, and the upper part of the feeding pipe 6 is connected to the feeding cylinder 2. The upper and lower parts are connected by an insulating sleeve 4.

[0033] An insulating material 1 is provided between the horizontal flue 5 and the horizontal cover plate 3. The insulating material 1 needs to have high temperature resistance and high compressive strength. The operating temperature of the insulating material 1 should not be lower than 400℃ and the compressive strength should not be lower than 100MPa.

[0034] The air collection port 9 has a horizontal width of 180mm and a vertical length of 120mm.

[0035] The horizontal flue 5 is connected to the main flue, which discharges the flue gas through thermal expansion.

[0036] In addition to the preferred embodiments described above, there are other embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection claimed by this utility model.

Claims

1. A novel aluminum electrolytic cell flue gas collection device, comprising a horizontal cover plate (3) and a covering material (7) for the electrolytic cell, characterized in that, A horizontal flue (5) is provided between the horizontal cover plate (3) and the covering material (7). There is one or more gas collection ports (9) below the horizontal flue (5). The positions of the gas collection ports (9) are the shell-breaking and feeding points. The gas collection port (9) includes the shell-breaking hammer (10) and the feeding pipe (6) above the shell-breaking hammer (10), and is inserted downward into the covering material (7) between the two anodes (8). An insulating material (1) is provided between the horizontal flue (5) and the horizontal cover plate (3).

2. The novel aluminum electrolysis cell flue gas collection device according to claim 1, characterized in that, The lower part of the feeding pipe (6) is located inside the air collection port (9), and the upper part of the feeding pipe (6) is connected to the feeding cylinder (2). The upper and lower parts are connected by an insulating sleeve (4).

3. The novel aluminum electrolysis cell flue gas collection device according to claim 1, characterized in that, A blowpipe (11) is inserted into the horizontal flue (5).

4. The novel aluminum electrolysis cell flue gas collection device according to claim 1, characterized in that, The horizontal width of the gas collection port (9) is 160mm~200mm.

5. A novel aluminum electrolysis cell flue gas collection device according to claim 1, characterized in that, The longitudinal length of the gas collecting port (9) is 110~125mm.

6. The novel aluminum electrolysis cell flue gas collection device according to claim 1, characterized in that, The horizontal flue (5) is connected to the main flue, and a negative pressure device is installed on the main flue.

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