High-temperature flue gas roasting device for aluminum electrolysis cell

Abstract

This utility model discloses a high-temperature flue gas roasting device for aluminum electrolysis cells, specifically relating to the field of high-temperature flue gas roasting technology for aluminum electrolysis cells. It includes multiple burners mounted on a combustion chamber, each burner comprising a combustion chamber body with a connecting ring fixedly connected to one end. This utility model first uses a shroud to diffuse the incoming gas and direct it towards the incoming air. The incoming air, through a guide plate, generates a rotating flow, colliding with the gas and moving outwards, thus re-mixing through a porous ring to improve mixing quality, thereby increasing combustion efficiency, reducing fuel consumption, and minimizing the generation of incomplete combustion products. Furthermore, by introducing high-pressure nitrogen through an inlet pipe into the annular pipe and then spraying it out from a high-pressure nitrogen nozzle to purge the inner wall of the combustion chamber, accumulated ash and coke can be effectively removed, reducing the workload and difficulty of manual cleaning and improving the automation level and operational reliability of the equipment.

Description

Technical Field

[0001] This utility model relates to the field of high-temperature flue gas roasting technology for aluminum electrolytic cells, and more specifically, to a high-temperature flue gas roasting device for aluminum electrolytic cells. Background Technology

[0002] In the aluminum electrolysis production process, new or overhauled electrolytic cells require high-temperature roasting before being put into use. High-temperature flue gas roasting is a widely used roasting method. Its principle is to generate high-temperature flue gas by burning fuel, and then use the heat of the flue gas to uniformly heat the electrolytic cell, ensuring that the electrolyte, electrodes, and other components within the cell reach suitable operating temperatures and physicochemical states, thereby guaranteeing the efficient and stable operation of the electrolysis process.

[0003] Chinese patent application CN201020615068.8 discloses a high-temperature flue gas roaster for aluminum electrolysis cells, comprising a control station, a fuel station, and a combustion station. One side of the fuel station is connected to fuel and air via connecting pipes, while the other side of the fuel station, via connecting pipes, delivers the fuel and air processed within the fuel station to the combustion station. Both the fuel station and the combustion station are connected to the control station. This invention, due to the good fluidity of the flue gas, ensures uniform roasting of every part within the electrolysis cell furnace and avoids burn-off of the anode and cathode. By controlling the oxygen content in the flue gas, it effectively solves the oxidation problem of the anode and cathode. The cathode and edge-rolled paste of the electrolysis cell can be roasted in one step, making it suitable for the roasting and start-up of new, overhauled, planned shutdown, and emergency-related aluminum electrolysis cells, as well as conventional and irregularly shaped aluminum electrolysis cells.

[0004] However, as can be seen from the accompanying drawings in the instruction manual, the combustion gas and air of the roasting device are mixed only through a perforated plate, which easily leads to insufficient mixing and incomplete combustion. This not only wastes fuel but also produces a large amount of incomplete combustion products, resulting in a large amount of ash and coking inside the combustion chamber, affecting its service life. Furthermore, the ash and coking produced are inconvenient to clean. Therefore, a high-temperature flue gas roasting device for an electrolytic cell is proposed. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a high-temperature flue gas roasting device for aluminum electrolysis cells to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-temperature flue gas roasting device for aluminum electrolysis cells, comprising multiple burners installed on a combustion chamber. Each burner includes a combustion chamber body, one end of which is fixedly connected to a connecting ring, and the other end of which is provided with a sealing plate adapted to the combustion chamber wall. The sealing plate allows the combustion chamber body to be located inside the combustion chamber during burner installation and seals the burner's mounting holes. A limiting ring is sleeved on the outside of the connecting ring, and a smoke guide pipe is fixedly connected to one side of the limiting ring.

[0007] A toothed ring is fixedly connected to the outside of the limiting ring. Two support seats are fixedly connected to one side of the combustion chamber. A rotating rod is inserted in the middle of the support seats. A gear is fixedly connected to one end of the rotating rod. A motor is connected to the other end of the rotating rod through the sealing plate. A cleaning mechanism is set in the middle of the combustion chamber. Starting the motor controls the rotating rod to drive the gear to control the toothed ring to rotate, which can control the rotation of the smoke guide pipe, thereby adjusting the orientation of the smoke guide pipe, improving the uniformity of flue gas distribution in the electrolytic cell, ensuring uniform heating of all parts of the electrolytic cell, facilitating adjustment and use, and the cleaning mechanism can easily clean the ash accumulated on the wall of the combustion chamber. The support seats improve the stability of the rotating rod rotation.

[0008] A mixing chamber is fixedly connected to the middle of the combustion chamber. A perforated plate is fixedly connected to one side of the mixing chamber. A perforated ring is fixedly connected to the middle of the mixing chamber. An ignition rod and an air inlet pipe are inserted into the side of the combustion chamber away from the smoke guide pipe. A gas inlet pipe is inserted into the middle of the air inlet pipe. A guide plate is fixedly connected to the outside of one end of the gas inlet pipe. A shroud is provided at one end of the gas inlet pipe. The spiral guide plate outside one end of the gas inlet pipe can cause the gas entering through the air inlet pipe to rotate and flow. The shroud can change the flow direction of the gas entering through the gas inlet pipe and cause the gas and air to collide and mix. The perforated ring and perforated plate can cause further collision and diffusion to achieve uniform mixing and provide good conditions for complete combustion. The ignition rod is used to ignite the mixed gas and air mixture to produce high-temperature flue gas.

[0009] Preferably, the limiting ring is configured as a "U" shaped structure, and the diameter of the end of the smoke guide pipe away from the limiting ring is smaller than the diameter near the limiting ring. The gear and the gear ring mesh with each other, and the limiting ring and the connecting ring limit the smoke guide pipe. By controlling the rotation of the gear ring through the gear, the outlet angle of the smoke guide pipe can be changed, so that the flue gas can be better diffused in the electrolytic cell and uniform roasting can be achieved.

[0010] Preferably, the motor is fixed to one side of the sealing plate, the ignition rod and the air inlet pipe both extend through the middle of the sealing plate to the outside, and an air connecting pipe is fixedly connected to one side of the air inlet pipe to facilitate connecting the air inlet pipe to an external gas pipe through the air connecting pipe.

[0011] Preferably, the guide plate is fixed in the middle of the air inlet pipe, the guide plate is configured as a spiral structure, the diameter of the umbrella is larger than the diameter of the air inlet pipe, a support rod is fixedly connected to one side of the umbrella, the support rod is fixed to one side of the gas inlet pipe, the guide plate improves the stability of one end of the air inlet pipe and the gas inlet pipe, and can guide the gas entering through the air inlet pipe to generate rotational force, the support rod fixes the umbrella, and the umbrella diffuses the entering gas.

[0012] Preferably, the inner diameter of the porous ring is the same as the diameter of the umbrella cover, the ignition rod is disposed on one side of the mixing box, and one end of the air inlet pipe is connected to the inner cavity of the mixing box. The mixed gas can be remixed through the porous ring.

[0013] Preferably, the cleaning mechanism includes a mixing chamber fixed around the combustion chamber cavity, an annular pipe fixedly connected to the side of the combustion chamber near the sealing plate, the inner cavity of the annular pipe communicating with the inner cavity of the high-pressure nitrogen nozzle, and an air inlet pipe inserted in the middle of the sealing plate.

[0014] Preferably, one end of the air inlet pipe is connected to the inner cavity of the annular pipe, and one end of the high-pressure nitrogen nozzle is set as an inclined surface, with the inclined surface of the high-pressure nitrogen nozzle facing the wall of the combustion chamber. High-pressure nitrogen enters the annular pipe through the air inlet pipe and is then sprayed out from the high-pressure nitrogen nozzle. The sprayed high-pressure nitrogen can powerfully blow away the accumulated ash and coke on the inner wall and internal components of the combustion chamber, eliminating the need for manual cleaning, improving cleaning efficiency and effectiveness, and ensuring the normal operation and combustion efficiency of the burner.

[0015] The technical effects and advantages of this utility model are as follows:

[0016] 1. This utility model firstly diffuses the incoming gas through the umbrella-shaped cover and moves it towards the incoming air. The incoming air will generate a rotating flow through the guide plate, collide with the gas, and move in all directions. It will then be remixed through the porous ring, improving the mixing quality, thereby improving combustion efficiency, reducing fuel consumption, and reducing the generation of incomplete combustion products. Furthermore, by introducing high-pressure nitrogen into the annular pipe through the air inlet pipe and then spraying it out from the high-pressure nitrogen nozzle, the inner wall of the combustion chamber can be effectively cleaned, removing accumulated ash and coke, reducing the workload and difficulty of manual cleaning, and improving the automation level and operational reliability of the equipment.

[0017] 2. This utility model also sets up a starting motor to control the rotating rod to drive the gear to rotate and control the rotation of the smoke guide nozzle through the gear ring, thereby changing the high-temperature flue gas ejection angle of the smoke guide nozzle. This enables the high-temperature flue gas to be evenly distributed in the electrolytic cell, ensuring uniform heating of all parts of the electrolytic cell, avoiding local overheating or overcooling, improving the roasting quality, extending the service life of the electrolytic cell lining material, ensuring stable operation of the electrolytic cell after startup and product quality, and improving the use effect.

[0018] In summary, through the interaction of the above-mentioned multiple effects, the mixing quality can be improved, thereby increasing combustion efficiency, reducing fuel consumption, reducing the generation of incomplete combustion products, facilitating the effective removal of ash and coking, reducing the workload and difficulty of manual cleaning, and changing the high-temperature flue gas ejection angle of the flue gas guide pipe, which can make the high-temperature flue gas evenly distributed in the electrolytic cell, ensuring that all parts of the electrolytic cell are heated evenly. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of this utility model.

[0021] Figure 3 This is a schematic diagram of the cross-section of this utility model from another angle.

[0022] Figure 4 This utility model Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0023] Figure 5 This is a cross-sectional front view of the present invention.

[0024] The attached diagram is labeled as follows: 1. Combustion chamber; 2. Connecting ring; 3. Limiting ring; 4. Smoke guide nozzle; 5. Gear ring; 6. Support base; 7. Rotating rod; 8. Gear; 9. Motor; 10. Ignition rod; 11. Mixing chamber; 12. Perforated plate; 13. Perforated ring; 14. Air inlet pipe; 15. Gas inlet pipe; 16. Support rod; 17. Umbrella cover; 18. Guide plate; 19. Air connecting pipe; 20. Sealing plate; 21. High-pressure nitrogen nozzle; 22. Annular pipe; 23. Inlet pipe. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] As attached Figure 1-5 The high-temperature flue gas roasting device for aluminum electrolysis cell shown includes multiple burners installed on the combustion chamber. Each burner includes a combustion chamber 1. A connecting ring 2 is fixedly connected to one end of the combustion chamber 1, and a sealing plate 20 adapted to the combustion chamber wall is provided at the other end of the combustion chamber 1. The sealing plate 20 can be used to ensure that the combustion chamber 1 is located inside the combustion chamber when the burner is installed, and to seal the mounting hole of the burner. A limiting ring 3 is sleeved on the outside of the connecting ring 2, and a smoke guide pipe 4 is fixedly connected to one side of the limiting ring 3.

[0027] A toothed ring 5 is fixedly connected to the outside of the limiting ring 3. Two support seats 6 are fixedly connected to one side of the combustion chamber 1. A rotating rod 7 is inserted in the middle of the support seat 6. A gear 8 is fixedly connected to one end of the rotating rod 7. The other end of the rotating rod 7 passes through the sealing plate 20 and is connected to a motor 9. A cleaning mechanism is set in the middle of the combustion chamber 1. The motor 9 is started to control the rotating rod 7 to drive the gear 8 to control the toothed ring 5 to rotate. This can control the rotation of the smoke guide pipe 4, thereby adjusting the orientation of the smoke guide pipe 4, improving the uniformity of flue gas distribution in the electrolytic cell, ensuring uniform heating of all parts of the electrolytic cell, facilitating adjustment and use, and the cleaning mechanism can easily clean the ash accumulated on the wall of the combustion chamber 1. The support seat 6 improves the stability of the rotation of the rotating rod 7.

[0028] A mixing chamber 11 is fixedly connected to the middle of the combustion chamber 1. A perforated plate 12 is fixedly connected to one side of the mixing chamber 11. A perforated ring 13 is fixedly connected to the middle of the mixing chamber 11. An ignition rod 10 and an air inlet pipe 14 are inserted on the side of the combustion chamber 1 away from the smoke guide pipe 4. A gas inlet pipe 15 is inserted in the middle of the air inlet pipe 14. A guide plate 18 is fixedly connected to the outside of one end of the gas inlet pipe 15. A shroud 17 is provided at one end of the gas inlet pipe 15. The spiral guide plate 18 on the outside of one end of the gas inlet pipe 15 can cause the gas entering through the air inlet pipe 14 to rotate and flow. The shroud 17 can change the flow direction of the gas entering through the gas inlet pipe 15 and cause the gas and air to collide and mix. The perforated ring 13 and the perforated plate 12 can collide and diffuse again to achieve uniform mixing and provide good conditions for complete combustion. The ignition rod 10 is used to ignite the mixed gas and air mixture to produce high-temperature flue gas.

[0029] As attached Figure 1-5As shown, the limiting ring 3 is configured with a "U" shape. The diameter of the end of the smoke guide pipe 4 away from the limiting ring 3 is smaller than the diameter of the end near the limiting ring 3. The gear 8 and the gear ring 5 mesh. The motor 9 is fixed to one side of the sealing plate 20. The ignition rod 10 and the air inlet pipe 14 both extend through the middle of the sealing plate 20 to the outside. An air connection pipe 19 is fixedly connected to one side of the air inlet pipe 14. The guide plate 18 is fixed to the middle of the air inlet pipe 14 and is configured with a spiral structure. The diameter of the umbrella cover 17 is larger than the diameter of the air inlet pipe 14. A support rod 16 is fixedly connected to one side of the umbrella cover 17 and is fixed to one side of the gas inlet pipe 15. The inner diameter of the porous ring 13 is the same as the diameter of the umbrella cover 17. The ignition rod 10 is located in the mixing box. On one side of 11, one end of the air inlet pipe 14 is connected to the inner cavity of the mixing box 11. The smoke guide pipe 4 is limited by the limiting ring 3 and the connecting ring 2. The gear ring 5 is rotated by the gear 8, which can change the outlet angle of the smoke guide pipe 4, so that the flue gas can be better diffused in the electrolytic cell and achieve uniform roasting. It is convenient to connect the air inlet pipe 14 to the external gas pipe through the air connecting pipe 19. The stability of one end of the air inlet pipe 14 and the gas inlet pipe 15 is improved by the guide plate 18, and the gas entering through the air inlet pipe 14 can be guided to generate rotational force. The umbrella cover 17 is fixed by the support rod 16, and the incoming gas is diffused by the umbrella cover 17. The mixed gas can be remixed by the porous ring 13.

[0030] As attached Figure 1 , 2 As shown in Figures 3 and 5, the cleaning mechanism includes a mixing chamber 11 fixed around the combustion chamber 1. An annular pipe 22 is fixedly connected to the side of the combustion chamber 1 near the sealing plate 20. The inner cavity of the annular pipe 22 is connected to the inner cavity of the high-pressure nitrogen nozzle 21. An air inlet pipe 23 is inserted in the middle of the sealing plate 20. One end of the air inlet pipe 23 is connected to the inner cavity of the annular pipe 22. One end of the high-pressure nitrogen nozzle 21 is set as an inclined surface, with the inclined surface of one end of the high-pressure nitrogen nozzle 21 facing the wall of the combustion chamber 1. High-pressure nitrogen enters the annular pipe 22 through the air inlet pipe 23 and is then sprayed out from the high-pressure nitrogen nozzle 21. The sprayed high-pressure nitrogen can powerfully sweep away the ash and coke accumulated on the inner wall and internal components of the combustion chamber 1 without manual cleaning, improving cleaning efficiency and effect, and ensuring the normal operation and combustion efficiency of the burner.

[0031] The working principle of this utility model is as follows: When in use, the combustion chamber 1 is installed and fixed to the combustion chamber wall through the sealing plate 20 to ensure good sealing and prevent heat and flue gas leakage. The gas and air supply system is turned on. The gas enters the mixing chamber 11 through the gas inlet pipe 15, and the air enters the mixing chamber 11 through the air inlet pipe 14. Under the action of the guide plate 18, a rotating flow is generated. The umbrella cover 17 can make the gas and air collide and mix, and then mix again through the porous ring 13 to improve the mixing quality.

[0032] Then, the ignition rod 10 is activated to ignite the mixed gas and air mixture, which is then burned in the combustion chamber 1 to produce high-temperature flue gas. The high-temperature flue gas is then injected into the electrolytic cell through the guide pipe 4.

[0033] During use, the motor 9 can be started as needed to control the rotation of the smoke guide pipe 4 in sequence, adjust the angle of the smoke guide pipe 4, change the direction of flue gas injection, and achieve uniform roasting of the electrolytic cell.

[0034] When it is necessary to clean the ash and coking inside the combustion chamber 1, high-pressure nitrogen can be introduced into the annular pipe 22 through the air inlet pipe 23 and then sprayed out from the high-pressure nitrogen nozzle 21 to blow away the ash and coking inside the combustion chamber 1, making it easy to clean and use.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-temperature flue gas roasting device for aluminum electrolysis cells, comprising multiple burners mounted on a combustion chamber, characterized in that: The burner includes a combustion chamber (1), one end of which is fixedly connected to a connecting ring (2), and the other end of which is provided with a sealing plate (20) adapted to the combustion chamber wall. A limiting ring (3) is sleeved on the outside of the connecting ring (2), and a smoke guide pipe (4) is fixedly connected to one side of the limiting ring (3). A toothed ring (5) is fixedly connected to the outside of the limiting ring (3). Two support seats (6) are fixedly connected to one side of the combustion chamber (1). A rotating rod (7) is inserted in the middle of the support seat (6). A gear (8) is fixedly connected to one end of the rotating rod (7). A motor (9) is connected to the other end of the rotating rod (7) through the sealing plate (20). A cleaning mechanism is provided in the middle of the combustion chamber (1). A mixing chamber (11) is fixedly connected to the middle of the combustion chamber (1). A perforated plate (12) is fixedly connected to one side of the mixing chamber (11). A perforated ring (13) is fixedly connected to the middle of the mixing chamber (11). An ignition rod (10) and an air inlet pipe (14) are inserted on the side of the combustion chamber (1) away from the smoke nozzle (4). A gas inlet pipe (15) is inserted in the middle of the air inlet pipe (14). A guide plate (18) is fixedly connected to the outside of one end of the gas inlet pipe (15). A cover (17) is provided at one end of the gas inlet pipe (15).

2. The aluminium electrolysis cell high temperature fume calcination apparatus defined in claim 1, characterised in that: The limiting ring (3) is configured as a "U" shaped structure. The diameter of the end of the smoke guide pipe (4) away from the limiting ring (3) is smaller than the diameter near the limiting ring (3). The gear (8) and the gear ring (5) mesh with each other.

3. The aluminum electrolysis cell high temperature fume calciner of claim 1, characterized by: The motor (9) is fixed on one side of the sealing plate (20). The ignition rod (10) and the air inlet pipe (14) both extend through the middle of the sealing plate (20) to the outside. An air connection pipe (19) is fixedly connected to one side of the air inlet pipe (14).

4. The aluminum electrolysis cell high temperature fume calciner of claim 1, characterized by: The guide plate (18) is fixed in the middle of the air inlet pipe (14). The guide plate (18) is configured as a spiral structure. The diameter of the umbrella cover (17) is larger than the diameter of the air inlet pipe (14). A support rod (16) is fixedly connected to one side of the umbrella cover (17). The support rod (16) is fixed to one side of the gas inlet pipe (15).

5. The aluminum electrolysis cell high temperature fume calciner of claim 1, characterized by: The inner diameter of the porous ring (13) is the same as the diameter of the umbrella cover (17). The ignition rod (10) is located on one side of the mixing box (11). One end of the air inlet pipe (14) is connected to the inner cavity of the mixing box (11).

6. The aluminum electrolysis cell high temperature fume calciner of claim 1, characterized by: The cleaning mechanism includes a mixing chamber (11) fixed around the combustion chamber (1) and an annular pipe (22) fixedly connected to the side of the combustion chamber (1) near the sealing plate (20). The inner cavity of the annular pipe (22) is connected to the inner cavity of the high-pressure nitrogen spray pipe (21). An air inlet pipe (23) is inserted in the middle of the sealing plate (20).

7. The aluminium reduction cell high temperature fume calciner as claimed in claim 6 wherein: One end of the air intake pipe (23) is connected to the inner cavity of the annular pipe (22), and one end of the high-pressure nitrogen nozzle (21) is set as an inclined surface, with the inclined surface of one end of the high-pressure nitrogen nozzle (21) facing the wall of the combustion chamber (1).

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