Electrolytic aluminum flue gas desulfurization device
By using a negative pressure device and a partition to divide the flue gas in the electrolytic aluminum flue gas desulfurization device, the problem of insufficient contact between the flue gas and the eluent in traditional devices is solved, and efficient sulfur removal and cost reduction effect is achieved .
Patent Information
- Application Number
- CN202411824498.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-02-18
AI Technical Summary
When the flue gas flow rate of the traditional electrolytic aluminum flue gas desulfurization device is insufficient in contact with the spray eluent, resulting in low sulfur removal efficiency, high cost and poor effect.
Design an electrolytic aluminum flue gas desulfurization device, which uses a negative pressure device to generate negative pressure in the elution tank, absorbs the flue gas through the intake pipe and enters the elution tank, and the flue gas reacts in the eluent to remove sulfur, and passes through the separator Split the flue gas to increase the contact area with the eluent.
It improves the sulfur removal efficiency in flue gas, reduces the cost and land occupation of the desulfurization system, and achieves more efficient flue gas desulfurization.
Smart Images
Figure CN119455642A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of desulfurization devices, and in particular to a flue gas desulfurization device for electrolytic aluminum. Background Art
[0002] The flue gas emitted during the electrolytic aluminum production process contains a large amount of pollutants, including fluorides, dust, asphalt smoke (low concentration) and SO2. The SO2 in the flue gas mainly comes from the pre-baked anode of the electrolytic cell production raw materials. Under the high temperature environment in the electrolytic cell, the sulfur in the anode carbon block is oxidized into SO2 and enters the electrolytic flue gas. Desulfurization of electrolytic aluminum flue gas is an indispensable process in the treatment of electrolytic aluminum flue gas. Electrolytic aluminum flue gas is only allowed to be discharged after desulfurization. Electrolytic aluminum flue gas desulfurization equipment is required in this process.
[0003] Traditional desulfurization devices mainly remove sulfur from flue gas by spraying sulfur-containing eluent into the flue gas and neutralizing it with acid and alkali. However, electrolysis plants usually have multiple electrolytic cells, which produce a large amount of flue gas during operation. Therefore, the flue gas flow is very large. By spraying the eluent, the flue gas and the eluent are not in sufficient contact, and the removal efficiency of sulfur-containing compounds is not high. In addition, a large-scale desulfurization system is required, so the cost is high and the effect is poor. Therefore, it is necessary to design a more efficient flue gas desulfurization device. Summary of the invention
[0004] The object of the present invention is to provide a fume desulfurization device for aluminum electrolysis, which can efficiently desulfurize the fume generated during the aluminum electrolysis process.
[0005] The present invention is achieved through the following technical scheme: the electrolytic aluminum flue gas desulfurization device of the present invention includes an elution tank, a negative pressure device connected to the upper end of the elution tank, an air intake pipe connected to the lower end side wall of the elution tank, a partition plate arranged at the lower end of the elution tank, a plurality of through holes opened on the partition plate, a spraying device arranged at the upper end of the elution tank, a first liquid discharge pipe arranged on the lower end side wall of the elution tank, and a first liquid discharge pump connected to the first liquid discharge pipe; the spraying device is arranged above the partition plate, the partition plate is arranged above the connection between the air intake pipe and the elution tank, and the elution tank is provided with eluent.
[0006] Furthermore, one end of the air inlet pipe close to the elution tank is Z-shaped, and the highest point of the air inlet pipe is higher than the liquid level in the elution tank.
[0007] Furthermore, the air inlet pipes are provided in plurality, and the plurality of air inlet pipes are evenly distributed on the outer wall of the elution tank.
[0008] Furthermore, a plurality of the partitions are provided, and the plurality of the partitions are evenly distributed along the vertical direction.
[0009] Furthermore, among the plurality of partitions, the height of the partition located at the top is higher than the height of the liquid level in the elution tank; and the partition located at the bottom is immersed in the eluent.
[0010] Furthermore, the spraying device includes a plurality of spraying pipes horizontally arranged in the elution tank, a plurality of nozzles opened on the lower side of the spraying pipes, a liquid supply pipe connected to the plurality of spraying pipes, and a liquid supply pump connected to the liquid supply pipes; the plurality of spraying pipes are located at the same height and are evenly distributed in the elution tank.
[0011] Furthermore, the negative pressure device includes a connecting pipe connected to the upper end of the elution tank, a negative pressure tank connected to the connecting pipe, a negative pressure pipe connected to the upper end of the negative pressure tank, a negative pressure machine connected to the negative pressure pipe, a second drainage pipe provided on the lower end side wall of the negative pressure tank, and a second drainage pump connected to the second drainage pipe; the connecting pipe is connected to the lower end side wall of the negative pressure tank, and there is a gap between the connection between the connecting pipe and the negative pressure tank and the inner bottom wall of the negative pressure tank; the height of the connection between the second drainage pipe and the negative pressure tank is lower than the height of the connection between the connecting pipe and the negative pressure tank.
[0012] Furthermore, a plurality of filter cottons are arranged in the negative pressure tank, and the plurality of filter cottons are evenly distributed in the vertical direction;
[0013] The heights of the plurality of filter cottons are all higher than the connection between the connecting pipe and the negative pressure tank.
[0014] The technical solution of the present invention has at least the following advantages and beneficial effects: the electrolytic aluminum flue gas desulfurization device of the present invention generates negative pressure in the elution tank through the negative pressure device, and then applies the negative pressure to each air inlet pipe, absorbs the flue gas generated in the electrolytic aluminum process through the air inlet pipe, and sucks the flue gas into the elution tank. After the flue gas enters the elution tank, it will directly enter from the lower end of the elution tank, and then pass through the eluent at the bottom of the elution tank and be discharged from the upper end of the elution tank. When the flue gas passes through the eluent, the sulfur component in the flue gas reacts with the alkali in the eluent and is retained, and after the flue gas passes through the through hole on the upper end of the partition, the flue gas can be divided into smaller parts, so that it can be more fully combined with the desulfurization agent. After the flue gas is discharged from the eluent, it contacts with the eluent sprayed from the spraying device to further remove the residual sulfur in the flue gas, so that the eluent in the flue gas can be discharged more fully. Since the spraying device continuously sprays the eluent into the eluent tank, it is necessary to use the first liquid discharge pipe and the first liquid discharge pump to discharge the excess eluent, so that the eluent in the eluent tank maintains a relatively constant amount (the spraying amount of the spraying device is greater than or equal to the discharge amount of the first liquid discharge pump), and the eluent discharged from the first liquid discharge pipe can be treated and then sprayed into the eluent tank again through the spraying device, so that the eluent in the eluent tank always maintains a high alkali content. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 A schematic diagram of the structure of an aluminum electrolytic flue gas desulfurization device provided in an embodiment of the present invention;
[0016] Figure 2 A schematic structural diagram of the interior of an electrolytic aluminum flue gas desulfurization device from one perspective provided in an embodiment of the present invention;
[0017] Figure 3 A schematic structural diagram of the interior of an electrolytic aluminum flue gas desulfurization device from two perspectives provided in an embodiment of the present invention;
[0018] Figure 4 A schematic structural diagram of a spraying device portion provided in an embodiment of the present invention.
[0019] Icons: 11-elution tank, 12-air inlet pipe, 13-partition, 14-through hole, 15-first liquid discharge pipe, 16-spraying device, 161-spraying pipe, 162-nozzle, 163-liquid supply pipe, 20-negative pressure device, 21-connecting pipe, 22-negative pressure tank, 23-negative pressure pipe, 24-second liquid discharge pipe, 25-filter cotton. DETAILED DESCRIPTION
[0020] Example
[0021] The following is further described in conjunction with specific embodiments. Figure 1 -Attached Figure 4As shown, the electrolytic aluminum flue gas desulfurization device of this embodiment includes an elution tank 11, a negative pressure device 20 connected to the upper end of the elution tank 11, an air inlet pipe 12 connected to the side wall of the lower end of the elution tank 11, a partition 13 arranged at the lower end of the elution tank 11, a plurality of through holes 14 opened on the partition 13, a spraying device 16 arranged at the upper end of the elution tank 11, a first liquid discharge pipe 15 arranged on the side wall of the lower end of the elution tank 11, and a first liquid discharge pump connected to the first liquid discharge pipe 15; the spraying device 16 is arranged above the partition 13, the partition 13 is arranged above the connection between the air inlet pipe 12 and the elution tank 11, and the elution tank 11 is provided with eluent. Specifically, negative pressure is generated in the elution tank 11 by the negative pressure device 20, and then the negative pressure is applied to each air inlet pipe 12, and the flue gas generated in the electrolytic aluminum process is absorbed through the air inlet pipe 12, and the flue gas is sucked into the elution tank 11. After the flue gas enters the elution tank 11, it will directly enter from the lower end of the elution tank 11, and then pass through the eluent at the bottom of the elution tank 11 and be discharged from the upper end of the elution tank 11. When the flue gas passes through the eluent, the sulfur component in the flue gas reacts with the alkali in the eluent and is retained, and after the flue gas passes through the through hole 14 at the upper end of the partition 13, the flue gas can be divided into smaller parts, so that it can be more fully in contact with the eluent. After the flue gas is discharged from the eluent , and contacts with the eluent sprayed from the spraying device 16 to further remove the residual sulfur in the flue gas, so that the eluent in the flue gas can be discharged more fully. Since the spraying device 16 continuously sprays the eluent into the eluent tank 11, it is necessary to use the first discharge pipe 15 and the first discharge pump to discharge the excess eluent, so that the eluent in the eluent tank 11 maintains a relatively constant amount (the spraying amount of the spraying device 16 is greater than or equal to the discharge amount of the first discharge pump), and the eluent discharged from the first discharge pipe 15 can be processed and then sprayed into the eluent tank 11 again through the spraying device 16, so that the eluent in the eluent tank 11 always maintains a high alkali content.
[0022] The end of the air inlet pipe 12 in this embodiment close to the elution tank 11 is Z-shaped, and the highest point of the air inlet pipe 12 is higher than the liquid level in the elution tank 11. Specifically, this can prevent the eluent from flowing back into the air inlet pipe 12.
[0023] In this embodiment, multiple air inlet pipes 12 are provided, and the multiple air inlet pipes 12 are evenly distributed on the outer wall of the elution tank 11. Specifically, since there are many electrolytic cells, the flue gas generated by the multiple electrolytic cells can be absorbed into one elution tank 11 for elution, which can reduce the number of elution tanks 11.
[0024] In this embodiment, there are multiple partitions 13, and the multiple partitions 13 are evenly distributed in the vertical direction. Among the multiple partitions 13, the height of the partition 13 located at the top is higher than the height of the liquid level in the elution tank 11; the partition 13 located at the bottom is immersed in the eluent. Specifically, the partition 13 located inside the eluent is used to divide the smoke into filaments so that it can better contact the eluent, and the partition 13 located above the eluent surface is used to block the eluent to minimize its entry into the negative pressure device 20 driven by the smoke.
[0025] The spraying device 16 in this embodiment includes a plurality of spraying pipes 161 horizontally arranged in the elution tank 11, a plurality of nozzles 162 opened at the lower side of the spraying pipes 161, a liquid supply pipe 163 connected to the plurality of spraying pipes 161, and a liquid supply pump connected to the liquid supply pipe 163; the plurality of spraying pipes 161 are located at the same height and are evenly distributed in the elution tank 11.
[0026] The negative pressure device 20 in this embodiment includes a connecting pipe 21 connected to the upper end of the elution tank 11, a negative pressure tank 22 connected to the connecting pipe 21, a negative pressure pipe 23 connected to the upper end of the negative pressure tank 22, a negative pressure machine connected to the negative pressure pipe 23, a second liquid discharge pipe 24 provided on the lower side wall of the negative pressure tank 22, and a second liquid discharge pump connected to the second liquid discharge pipe 24; the connecting pipe 21 is connected to the lower side wall of the negative pressure tank 22, and there is a gap between the connection between the connecting pipe 21 and the negative pressure tank 22 and the inner bottom wall of the negative pressure tank 22; the height of the connection between the second liquid discharge pipe 24 and the negative pressure tank 22 is lower than the height of the connection between the connecting pipe 21 and the negative pressure tank 22. A plurality of filter cottons 25 are arranged in the negative pressure tank 22, and the plurality of filter cottons 25 are evenly distributed in the vertical direction; the heights of the plurality of filter cottons 25 are all higher than the connection between the connecting pipe 21 and the negative pressure tank 22. Specifically, the negative pressure tank 22 can be used to collect the eluent discharged from the elution tank 11 (the high-speed flowing flue gas will take away part of the eluent). After the eluent in the flue gas enters the negative pressure tank 22, it is retained by the filter cotton 25 in the negative pressure tank 22, gathers into water droplets and drips to the bottom of the negative pressure tank 22. After accumulating to a certain amount, it can be discharged using the second drain pipe 24 and the second drain pump. This can effectively reduce the amount of eluent entering the negative pressure machine and subsequent pipelines, and reduce the corrosion of the eluent to the negative pressure machine and pipelines.
[0027] In summary, the electrolytic aluminum flue gas desulfurization device of this embodiment generates negative pressure in the elution tank 11 through the negative pressure device 20, and then applies the negative pressure to each air inlet pipe 12, absorbs the flue gas generated in the electrolytic aluminum process through the air inlet pipe 12, and sucks the flue gas into the elution tank 11. After the flue gas enters the elution tank 11, it will directly enter from the lower end of the elution tank 11, and then pass through the eluent at the bottom of the elution tank 11 and be discharged from the upper end of the elution tank 11. When the flue gas passes through the eluent, the sulfur component in the flue gas reacts with the alkali in the eluent and is retained, and after the flue gas passes through the through hole 14 at the upper end of the partition 13, the flue gas can be divided into smaller parts, so that it can be more fully in contact with the eluent, and the flue gas from After being discharged from the eluent, it contacts with the eluent sprayed from the spraying device 16 to further remove the residual sulfur in the flue gas, so that the eluent in the flue gas can be discharged more fully. Since the spraying device 16 continuously sprays the eluent into the eluent tank 11, it is necessary to use the first drain pipe 15 and the first drain pump to discharge the excess eluent, so that the eluent in the eluent tank 11 maintains a relatively constant amount (the spraying amount of the spraying device 16 is greater than or equal to the discharge amount of the first drain pump), and the eluent discharged from the first drain pipe 15 can be processed and then sprayed into the eluent tank 11 again through the spraying device 16, so that the eluent in the eluent tank 11 always maintains a high alkali content.
[0028] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. An electrolytic aluminum flue gas desulfurization device, characterized in that: The invention comprises an elution tank (11), a negative pressure device (20) connected to the upper end of the elution tank (11), an air inlet pipe (12) connected to the side wall of the lower end of the elution tank (11), a partition (13) arranged at the lower end of the elution tank (11), a plurality of through holes (14) opened on the partition (13), a spraying device (16) arranged at the upper end of the elution tank (11), a first liquid discharge pipe (15) arranged on the side wall of the lower end of the elution tank (11), and a first liquid discharge pump connected to the first liquid discharge pipe (15); The spraying device (16) is arranged above the partition (13), and the partition (13) is arranged above the connection between the air inlet pipe (12) and the elution tank (11), and the elution tank (11) is provided with an eluent.
2. The aluminum electrolytic flue gas desulfurization device according to claim 1, characterized in that: One end of the air inlet pipe (12) close to the elution tank (11) is Z-shaped, and the highest point of the air inlet pipe (12) is higher than the liquid level in the elution tank (11).
3. The aluminum electrolytic flue gas desulfurization device according to claim 1, characterized in that: A plurality of the air inlet pipes (12) are provided, and the plurality of the air inlet pipes (12) are evenly distributed on the outer wall of the elution tank (11).
4. The aluminum electrolytic flue gas desulfurization device according to claim 1, characterized in that: A plurality of partitions (13) are provided, and the plurality of partitions (13) are evenly distributed along the vertical direction.
5. The aluminum electrolytic flue gas desulfurization device according to claim 4, characterized in that: Among the plurality of partitions (13), the partition (13) located at the top is higher than the height of the liquid level in the elution tank (11); and the partition (13) located at the bottom is immersed in the elution liquid.
6. The aluminum electrolytic flue gas desulfurization device according to claim 1, characterized in that: The spraying device (16) comprises a plurality of spraying pipes (161) horizontally arranged in the elution tank (11), a plurality of spray heads (162) opened at the lower side of the spraying pipes (161), a liquid supply pipe (163) connected to the plurality of spraying pipes (161), and a liquid supply pump connected to the liquid supply pipe (163); The plurality of spray pipes (161) are located at the same height and are evenly distributed in the elution tank (11).
7. The aluminum electrolytic flue gas desulfurization device according to claim 1, characterized in that: The negative pressure device (20) comprises a connecting pipe (21) connected to the upper end of the elution tank (11), a negative pressure tank (22) connected to the connecting pipe (21), a negative pressure pipe (23) connected to the upper end of the negative pressure tank (22), a negative pressure machine connected to the negative pressure pipe (23), a second liquid discharge pipe (24) provided on the side wall of the lower end of the negative pressure tank (22), and a second liquid discharge pump connected to the second liquid discharge pipe (24); The connecting pipe (21) is in communication with the side wall of the lower end of the negative pressure tank (22); a gap is provided between the connection point between the connecting pipe (21) and the negative pressure tank (22) and the inner bottom wall of the negative pressure tank (22); and the height of the connection point between the second drain pipe (24) and the negative pressure tank (22) is lower than the height of the connection point between the connecting pipe (21) and the negative pressure tank (22).
8. The aluminum electrolytic flue gas desulfurization device according to claim 1, characterized in that: A plurality of filter cottons (25) are arranged in the negative pressure tank (22), and the plurality of filter cottons (25) are evenly distributed in the vertical direction; The heights of the plurality of filter cottons (25) are all higher than the connection point between the connecting pipe (21) and the negative pressure tank (22).