A pre-baked anode calcination flue gas treatment device and treatment method for electrolytic aluminum

Abstract

The present disclosure relates to the technical field of flue gas treatment. The present disclosure provides a pre-baked anode calcination flue gas treatment device and a treatment method for electrolytic aluminum. The treatment device includes a main body having an accommodation space; a plurality of anode tubes are arranged in sequence in the accommodation space; a cathode wire is disposed through each anode tube, and after the cathode wire is energized, impurities in the flue gas can be adsorbed into the anode tube; a spraying member is disposed in the accommodation space; a plurality of rotating pieces are provided, and one rotating piece is rotatably disposed in each anode tube. The present disclosure also provides a pre-baked anode calcination flue gas treatment method for electrolytic aluminum, and the treatment method includes denitrifying the flue gas by passing it through a denitrifying member; desulfurizing the denitrified flue gas by passing it through a desulfurization tower; removing impurities from the desulfurized flue gas; and passing the impurity-removed flue gas into a dewhite tower. Through the above technical solution, the technical problem that a large amount of water source is used during self-cleaning of the flue gas treatment device in the prior art is solved.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the technical field of flue gas treatment, and more specifically, to a device and a method for treating pre-baked anode calcination flue gas for electrolytic aluminum production. Background Art

[0002] In the electrolytic aluminum industry, a large amount of flue gas is generated during the pre-baked anode calcination process. The composition of this flue gas is complex and contains various pollutants, such as nitrogen oxides (NOx), sulfur oxides (SOx), dust particles, and other harmful substances.

[0003] Currently, for the treatment of pre-baked anode calcination flue gas, traditional methods usually first use denitration and desulfurization equipment to treat the flue gas for denitration and desulfurization, and then transport the treated flue gas to a wet electrostatic precipitator for further impurity removal. Although the wet electrostatic precipitator can effectively remove impurities such as dust particles in the flue gas, there are still some deficiencies in actual use.

[0004] Among them, most of the existing automatic ash cleaning methods of wet electrostatic precipitators rely on the spray system. Through long-term spraying, the impurity dust adsorbed on the inner wall of the electrode plate or the anode tube is washed away by the scouring action of the water flow to achieve the purpose of automatic cleaning. This method uses a large amount of water, which does not meet the current requirements of energy conservation, emission reduction, and sustainable development. Summary of the Invention

[0005] To overcome the above defects, embodiments of the present disclosure provide a device and a method for treating pre-baked anode calcination flue gas for electrolytic aluminum production, which solve the technical problem of using a large amount of water during self-cleaning of the existing flue gas treatment device.

[0006] According to one aspect, at least one embodiment of the present disclosure provides a device for treating pre-baked anode calcination flue gas for electrolytic aluminum production, including:

[0007] A main body having an accommodation space with an air inlet and an air outlet;

[0008] A plurality of anode tubes arranged in sequence in the accommodation space, and the flue gas passes through the air inlet, the anode tubes, and the air outlet in sequence;

[0009] A cathode wire is disposed in each anode tube, and the cathode wire can adsorb impurities in the flue gas to the inner wall of the anode tube after being energized;

[0010] A spraying member disposed in the accommodation space and above the accommodation space for spraying water to clean the anode tubes;

[0011] Rotating pieces, there are several of the rotating pieces, and one rotating piece is rotatably arranged in each anode tube. The rotating piece can rotate relative to the anode tube to throw the sprayed water towards the inner wall of the anode tube.

[0012] For example, in a pre-baked anode calcination flue gas treatment device for electrolytic aluminum provided by at least one embodiment of the present disclosure, the upper end surface of the rotating piece has a water-containing cavity, the lower end surface of the rotating piece has a guiding member, the guiding member has a guiding surface extending outward and downward to guide water flow to the inner wall of the anode tube, and a guiding hole communicating with the water-containing cavity and used for guiding water flow to the guiding member is provided on the rotating piece.

[0013] For example, in a pre-baked anode calcination flue gas treatment device for electrolytic aluminum provided by at least one embodiment of the present disclosure, the main body includes:

[0014] A housing, both the air inlet and the air outlet are located on the housing, and an accommodation space is formed inside the housing;

[0015] An upper mounting frame, which is arranged in the accommodation space;

[0016] A lower mounting frame, which is arranged in the accommodation space and correspondingly located below the upper mounting frame, and the anode tube is arranged between the upper mounting frame and the lower mounting frame in the up-down direction;

[0017] Mounting columns, there are several of the mounting columns, several mounting columns are horizontally arranged on both the upper mounting frame and the lower mounting frame, one end of the cathode wire is arranged on a mounting column of the upper mounting frame, the other end is arranged on a mounting column of the lower mounting frame, and several cathode wires are longitudinally arranged on each mounting column.

[0018] For example, in a pre-baked anode calcination flue gas treatment device for electrolytic aluminum provided by at least one embodiment of the present disclosure, the rotating piece has an internal gear ring, and further includes:

[0019] A mounting disc, which is located inside the anode tube, the rotating piece is rotatably arranged on the mounting disc, and the rotating piece and the mounting disc are coaxially arranged;

[0020] A first gear, which is eccentrically rotatably arranged on the mounting disc, and the first gear meshes with the internal gear ring and is used to drive the rotating piece to rotate.

[0021] For example, in a pre-baked anode calcination flue gas treatment device for electrolytic aluminum provided by at least one embodiment of the present disclosure, it further includes:

[0022] A second mounting bracket, which is arranged on the upper mounting bracket. The second mounting bracket is of a hollow structure, and gas is configured to flow through the second mounting bracket.

[0023] A wind wheel, which is rotatably arranged within the second mounting bracket and is capable of rotating driven by the gas.

[0024] A rotating shaft, which is rotatably arranged on the second mounting bracket, with one end thereof arranged on the wind wheel.

[0025] A turntable, which is arranged on the other end of the rotating shaft and is located outside the second mounting bracket. The turntable has an external gear ring.

[0026] A second gear, which meshes with the external gear ring.

[0027] A connecting rod, which is connected between the first gear and the second gear and is configured to drive the first gear to rotate under the action of the second gear.

[0028] For example, in a pre-baked anode calcination flue gas treatment device provided by at least one embodiment of the present disclosure for electrolytic aluminum production, the rotating blade is arranged to be movable up and down within the anode tube, and the turntable is arranged to be movable up and down on the rotating shaft.

[0029] For example, in a pre-baked anode calcination flue gas treatment device provided by at least one embodiment of the present disclosure for electrolytic aluminum production, the rotating shaft has a spiral groove, and the inner wall of the turntable has protrusions matching with the spiral groove. The turntable is capable of descending under the cooperation of the protrusions and the spiral groove, and after descending, is configured to drive the rotating blade to extend into the anode tube.

[0030] For example, in a pre-baked anode calcination flue gas treatment device provided by at least one embodiment of the present disclosure for electrolytic aluminum production, it further includes:

[0031] An elastic member, with one end thereof arranged on the turntable and the other end arranged on the second mounting bracket. The elastic member is configured to elastically push the turntable upward.

[0032] For example, in a pre-baked anode calcination flue gas treatment device provided by at least one embodiment of the present disclosure for electrolytic aluminum production, it further includes:

[0033] A denitration component;

[0034] A desulfurization tower, which is connected to the gas outlet end of the denitration component and is configured to receive the denitrified flue gas from the denitration component. The desulfurization tower is connected to the air inlet.

[0035] A dewhite tower, which is connected to the gas outlet. The dewhite tower is configured to receive the gas from the gas outlet and reduce the humidity of the flue gas.

[0036] According to another aspect, at least one embodiment of the present disclosure further provides a method for treating calcination flue gas of pre-baked anodes for electrolytic aluminum, including the following steps:

[0037] S1. Pass the flue gas into a denitrification component for denitrification;

[0038] S2. Pass the denitrified flue gas into a desulfurization tower for desulfurization;

[0039] S3. Pass the desulfurized flue gas into an air inlet. After the cathode wire is electrified, an electric field is formed between the cathode wire and the anode tube, and the electric field adsorbs impurities to the inner wall of the anode tube;

[0040] S3. Start the spraying component, pass in a gas to drive the wind wheel to rotate, and then control the rotating piece to descend and rotate inside the anode tube;

[0041] S4. Pass the impurity-removed flue gas into a dewhite tower, reduce the temperature of the flue gas below the dew point, and condense the water vapor into liquid water for separation.

[0042] The beneficial effects of the embodiments of the present disclosure are as follows:

[0043] In the present disclosure, in order to save water resources and improve the cleaning efficiency, a rotating piece is rotatably arranged inside each anode tube. The diameter of the rotating piece is smaller than the diameter of the inner cavity of the anode tube to ensure that water flow can pass through the inner wall of the anode tube and prevent the anode tube from being blocked by the rotating piece. To enhance the effect of the rotating piece and make the spraying water spray onto the inner wall of the anode tube as much as possible, the present disclosure rotates the rotating piece to throw the spraying water received by the upper end surface of the rotating piece towards the inner wall of the anode tube, enhancing the cleaning effect. The arrangement of the spraying component and the rotating piece can regularly clean the anode tube, prevent impurities from accumulating on the inner wall of the anode tube, ensure the long-term stable operation of the device, and extend the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for the description of the embodiments of the present disclosure. Obviously, the drawings in the following description are only some exemplary embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the content of the exemplary embodiments of the present disclosure and these drawings.

[0045] Figure 1 It is a schematic structural diagram of a device for treating calcination flue gas of pre-baked anodes for electrolytic aluminum in an embodiment of the present disclosure;

[0046] Figure 2 For Figure 1 an enlarged schematic view of part A;

[0047] Figure 3 For Figure 1 a schematic structural diagram of an anode tube in the embodiment;

[0048] Figure 4 Schematic diagram of the structure of the second gear in the embodiment of Figure 1 ;

[0049] Figure 5 Schematic diagram of the structure of the elastic member in the embodiment of Figure 1 ;

[0050] Figure 6 Schematic diagram of the structure of the mounting plate in the embodiment of Figure 1 ;

[0051] Figure 7 Enlarged schematic diagram at position B of Figure 6 ;

[0052] Figure 8 Schematic diagram of the local explosion structure in the embodiment of Figure 1 ;

[0053] Figure 9 Schematic diagram of the layout of two upper mounting brackets in the embodiment of Figure 1 ;

[0054] Figure 10 Schematic diagram of the flue gas treatment process in another embodiment of the present disclosure.

[0055] In the figure: 1. Main body, 11. Accommodating space, 12. Air inlet, 13. Air outlet, 2. Anode tube, 3. Cathode wire, 4. Spraying member, 5. Rotating piece, 52. Water-containing cavity, 53. Guide member, 14. Housing, 61. Upper mounting bracket, 62. Lower mounting bracket, 7. Mounting column, 54. Internal gear ring, 8. Mounting plate, 9. First gear, 10. Second mounting bracket, 110. Wind wheel, 120. Rotating shaft, 130. Turntable, 131. External gear ring, 140. Second gear, 150. Connecting rod, 121. Spiral groove, 132. Projection, 160. Elastic member, 17. Denitrification member, 18. Desulfurization tower, 19. Demisting tower. Detailed implementation manners

[0056] The present disclosure will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present disclosure, rather than limiting the present disclosure.

[0057] For the sake of simplicity of the drawings, only the parts related to the disclosure are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, for the sake of simplicity and easy understanding of the drawings, in some figures, components with the same structure or function are only schematically shown for one of them, or only one of them is marked. In this document, "one" not only means "only one", but also can mean "more than one", and "several" includes "two" and "more than two".

[0058] In this text, it should be noted that unless otherwise clearly specified and defined, the terms "install", "connect", and "link" 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, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this disclosure can be understood according to specific situations.

[0059] In this disclosure, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0060] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left", and "right" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operations, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to this disclosure.

[0061] In addition, in the description of this application, the terms "first", "second", etc. are only used for distinguishing descriptions, and cannot be understood as indicating or implying relative importance.

[0062] Embodiment 1

[0063] As Figures 1 to 3 shown, it shows a pre-baked anode calcination flue gas treatment device for electrolytic aluminum in an embodiment of this disclosure, including a main body 1. The main body 1 has an accommodation space 11, and the accommodation space 11 has an air inlet 12 and an air outlet 13; there are several anode tubes 2, which are arranged in sequence in the accommodation space 11, and the flue gas passes through the air inlet 12, the anode tubes 2, and the air outlet 13 in sequence; a cathode wire 3 is disposed in each anode tube 2, and the cathode wire 3 can adsorb impurities in the flue gas to the inner wall of the anode tube 2 after being electrified; a spraying member 4 is disposed in the accommodation space 11 and is located above the accommodation space 11, and the spraying member 4 is used for spraying water to clean the anode tubes 2; there are several rotating pieces 5, and one rotating piece 5 is rotatably disposed in each anode tube 2, and the rotating piece 5 can rotate relative to the anode tube 2 to make the sprayed water on its upper end face splash onto the inner wall of the anode tube 2.

[0064] For example, as Figures 1 to 3 shown, the main body 1 has a receiving space 11, and an air inlet 12 and an air outlet 13 are provided. A number of positive electrode tubes 2 are arranged and installed in the receiving space 11 in sequence to ensure that the flue gas can pass through the air inlet 12, the positive electrode tubes 2, and the air outlet 13 in sequence. A cathode wire 3 is inserted through each positive electrode tube 2. When the power is turned on, an electric field will be formed around the cathode wire 3, and the impurities in the flue gas will be adsorbed onto the inner wall of the positive electrode tube 2 under the action of the electric field. A spraying member 4 is installed above the receiving space 11. When it is necessary to clean the positive electrode tubes 2, the spraying member 4 is started regularly to spray water.

[0065] When cleaning the positive electrode tubes 2 in the prior art, it mainly relies on the spraying member 4 to spray a large amount of water, so that the sprayed water flows into the positive electrode tubes 2, flows through the inner wall of the positive electrode tubes 2, and washes down the impurities on the inner wall of the positive electrode tubes 2. In order to save water resources and improve the cleaning efficiency, a rotating piece 5 is rotatably arranged in each positive electrode tube 2. The diameter of the rotating piece 5 is smaller than the diameter of the inner through cavity of the positive electrode tube 2 to ensure that the water flow can flow through the inner wall of the positive electrode tube 2 after the rotating piece 5 rotates and prevent the positive electrode tube 2 from being blocked by the rotating piece 5. In order to enhance the effect of the rotating piece 5 and make the sprayed water spray onto the inner wall of the positive electrode tube 2 as much as possible, the present disclosure rotates the rotating piece 5 to throw the sprayed water received by the upper end face of the rotating piece 5 onto the inner wall of the positive electrode tube 2 to enhance the cleaning effect. The arrangements of the spraying member 4 and the rotating piece 5 can clean the positive electrode tubes 2 regularly, prevent impurities from accumulating on the inner wall of the positive electrode tubes 2, ensure the long-term stable operation of the device, and extend the service life of the device.

[0066] In some examples, the upper end face of the rotating piece 5 has a water receiving cavity 52, the lower end face of the rotating piece 5 has a guiding member 53, the guiding member 53 has a guiding surface 531 that extends outward and downward in an arc to guide the water flow to the inner wall of the positive electrode tube 2, and a diversion hole communicating with the water receiving cavity 52 and used for guiding the water flow to the guiding member is provided on the rotating piece 5.

[0067] For example, as Figure 4 shown, a water receiving cavity 52 is provided on the upper end face of the rotating piece 5. A guiding member 53 is installed on the lower end face of the rotating piece 5, so that one end of the guiding member 53 communicates with the water receiving cavity 52 and the other end communicates with the inner wall of the positive electrode tube 2. When the spraying member 4 sprays water, the water flows into the water receiving cavity 52. After the rotating piece 5 rotates, the water in the water receiving cavity 52 flows to the inner wall of the positive electrode tube 2 through the guiding member 53 under the action of centrifugal force.

[0068] The water receiving cavity 52 can make the sprayed water be thrown onto the inner wall of the positive electrode tube 2 through the diversion hole and the guiding surface, and the guiding surface 531 ensures that there is enough water for cleaning the inner wall of the positive electrode tube 2. The guiding member 53 can accurately guide the water to the inner wall of the positive electrode tube 2 to make the cleaning more comprehensive and thorough.

[0069] In some examples, the air inlet 12 and the air outlet 13 are both located on the housing 14; an accommodation space 11 is formed inside the housing 14; the upper mounting rack 61 is arranged in the accommodation space 11; the lower mounting rack 62 is arranged in the accommodation space 11 and is correspondingly located below the upper mounting rack 61, and the anode tube 2 is arranged between the upper mounting rack 61 and the lower mounting rack 62 in the vertical direction; there are several mounting columns 7, several mounting columns 7 are horizontally arranged on both the upper mounting rack 61 and the lower mounting rack 62, one end of the cathode wire 3 is arranged on one mounting column 7 of the upper mounting rack 61, and the other end is arranged on one mounting column 7 of the lower mounting rack 62, and several cathode wires 3 are longitudinally arranged on each mounting column 7.

[0070] For example, as Figure 3 , Figure 9 shown, the accommodation space 11, the air inlet 12 and the air outlet 13 are arranged on the housing 14. The upper mounting rack 61 is arranged in the accommodation space 11; the lower mounting rack 62 is arranged in the accommodation space 11, and the upper mounting rack 61 and the lower mounting rack 62 are arranged at intervals in the vertical direction, and the anode tube 2 is located between the upper mounting rack 61 and the lower mounting rack 62; there are several mounting columns 7, several mounting columns 7 are horizontally arranged on both the upper mounting rack 61 and the lower mounting rack 62, the length direction of the mounting column 7 is arranged longitudinally, one end of the cathode wire 3 is arranged on one mounting column 7 of the upper mounting rack 61, and the other end is arranged on one mounting column 7 of the lower mounting rack 62, and several cathode wires 3 are longitudinally arranged on each mounting column 7.

[0071] The arrangements of the upper mounting rack 61 and the mounting column 7 provide an installation structure for the anode tube 2 and the cathode wire 3, ensuring the structural stability of the device. The horizontally arranged mounting columns 7 and the longitudinally arranged cathode wires 3 form a reasonable layout. The reasonable installation layout enables the anode tube 2 and the cathode wire 3 to be arranged in an orderly manner, which is beneficial to the uniform passage of the flue gas and improves the adsorption efficiency of the electric field to impurities.

[0072] In some examples, the rotating piece 5 has an internal gear ring 54, the mounting disc 8 is located inside the anode tube 2 and is connected to the second mounting rack 10, the rotating piece 5 is rotatably arranged below the outer periphery of the mounting disc 8, and the rotating piece 5 is coaxially arranged with the mounting disc 8; the first gear 9 is eccentrically rotatably arranged on the mounting disc 8, and the first gear 9 meshes with the internal gear ring 54 and is used to drive the rotating piece 5 to rotate.

[0073] For example, as Figure 8 shown, the cathode wire 3 passes through the mounting disc 8 and the rotating piece 5. An internal gear ring 54 is arranged on the inner wall of the rotating piece 5, and a water-containing cavity 52 is formed between the upper end surface of the rotating piece 5 and the mounting disc 8 to ensure that the rotating piece 5 can rotate along the axis of the mounting disc 8 and prevent the sprayed water from flowing out of the through hole in the center of the rotating piece 5. The first gear 9 is eccentrically rotatably arranged on the mounting disc 8 and meshes with the internal gear ring 54. When the first gear 9 rotates, it drives the rotating piece 5 to rotate through meshing with the internal gear ring 54.

[0074] The mounting disc 8 provides rotational support for the rotating piece 5, ensuring that the rotating piece 5 can rotate stably. The meshing and transmission mode between the first gear 9 and the internal gear ring 54 enables the rotating piece 5 to more efficiently fling the sprayed water towards the inner wall of the anode tube 2, improving the cleaning effect.

[0075] It should be noted that the mounting disc 8 is an I-shaped block. The structure of the mounting disc 8 can not only prevent the first gear 9 from disengaging from the rotating piece 5, but also form a water-containing cavity 52 with the rotating block, ensuring the cleaning efficiency. The rotating piece 5 can convey the sprayed water to the inner wall of the anode tube 2 without a relatively high rotational speed.

[0076] In some examples, the second mounting bracket 10 is arranged on the upper mounting bracket 61. The second mounting bracket 10 is of a hollow structure, and a gas is used to pass through the second mounting bracket 10. The wind wheel 110 is rotatably arranged in the second mounting bracket 10, and the wind wheel 110 can rotate driven by the gas. The rotating shaft 120 is rotatably arranged on the second mounting bracket 10, and one end of the rotating shaft 120 is arranged on the wind wheel 110. The turntable 130 is arranged at the other end of the rotating shaft 120 and is located outside the second mounting bracket 10. An external gear ring 131 is provided on the outer wall of the turntable 130. The second gear 140 meshes with the external gear ring 131. The connecting rod 150 is connected between the first gear 9 and the second gear 140 and is used to drive the first gear 9 to rotate under the action of the second gear 140.

[0077] For example, as Figure 3 、 Figure 6 shown, the second mounting bracket 10 is mounted on the upper mounting bracket 61 and is set to be of a hollow structure for passing a gas. The wind wheel 110 is rotatably arranged in the second mounting bracket 10. When the gas passes through the second mounting bracket 10, it drives the wind wheel 110 to rotate. The rotating shaft 120 is rotatably arranged on the second mounting bracket 10, with one end connected to the wind wheel 110 and the other end mounting the turntable 130. The turntable 130 is located outside the second mounting bracket 10. A number of mounting shells are designed on the second mounting bracket 10. The turntable 130 is placed inside the mounting shells, and the mounting shells provide conditions for the installation of the second gear 140. An external gear ring 131 is provided on the outer wall of the turntable 130, and the second gear 140 meshing with the external gear ring 131 is mounted. The second gear rotates on the mounting shell.

[0078] The first gear 9 and the second gear 140 are connected by the connecting rod 150. The connecting rod 150 passes through the mounting shell and rotates on the rotating shell. When the wind wheel 110 rotates, it drives the turntable 130 to rotate through the rotating shaft 120, thereby causing the second gear 140 to rotate, and then driving the first gear 9 to rotate through the connecting rod 150, ultimately realizing the rotation of the rotating piece 5. The mounting disc 8 is connected to the second mounting bracket 10 through the first gear 9, the connecting rod 150, the second gear 140, and the rotating disc 130.

[0079] The wind wheel 110 is driven by gas to rotate, providing power for the rotation of the rotating piece 5, without the need for excessive additional electric drive, thereby reducing energy consumption and operating costs. Through a series of gear transmission structures, the rotation of the wind wheel 110 can be transmitted to the rotating piece 5, achieving effective transmission and conversion of power and ensuring the normal rotation of the rotating piece 5. It should be noted that the mounting shell can prevent the connecting rod 150 from deviating, and the rotating shaft 120 and the second mounting frame 10 are rotationally sealed.

[0080] In some examples, the rotating sheet 5 is lifted and lowered in the anode tube 2 , and the rotating disk 130 is lifted and lowered on the rotating shaft 120 .

[0081] For example, Figure 6 As shown, in order to prevent the rotating piece 5 from being always in the anode tube 2, resulting in poor exhaust of the anode tube 2, the present invention enables the rotating piece 5 to be raised and lowered in the anode tube 2. For example, when cleaning the anode tube 2, the rotating piece 5 is lowered into the anode tube 2, and when purifying the flue gas, the rotating piece 5 is raised out of the anode tube 2.

[0082] In some examples, the rotating shaft 120 has a spiral groove 121, and the inner wall of the rotating disk 130 has a protrusion 132 that slidably cooperates with 121. The rotating disk 130 can descend under the cooperation of the protrusion 132 and the spiral groove 121, and after descending, it drives the rotating sheet 5 to extend into the anode tube 2.

[0083] For example, Figure 7 As shown, a spiral groove 121 is processed on the surface of the rotating shaft 120, and a protrusion 132 is provided on the inner wall of the rotating disk 130. When the rotating shaft 120 rotates, the protrusion 132 slides along the spiral groove 121, thereby driving the rotating disk 130 to descend along the rotating shaft 120. For example: when it is necessary to clean the inner wall of the anode tube 2, ventilation is firstly conducted into the second mounting frame 10, and the wind wheel 110 is started to rotate the wind wheel 110 first. After the wind wheel 110 rotates, it drives the rotating shaft 120 to rotate. Due to the cooperation between the spiral groove 121 and the protrusion 132, after the rotating shaft 120 rotates, the protrusion 132 is first driven to slide along the spiral groove 121 through the spiral groove 121. After the protrusion 132 slides, when the rotating disk 130 descends to the lowest point of the spiral groove 121, the upper end face and the lower end face of the rotating disk 130 are both provided with extended edges. The side profile of the rotating disk 130 is an I-shaped. The second gear 140 is driven to descend by the extended edge, and the second gear 140 drives the rotating piece 5 to descend through the connecting rod 150 and the mounting plate 8. After the rotating piece 5 descends, it extends into the anode tube 2, and the rotating shaft 120 continues to rotate, driving the rotating disk 130 to rotate continuously, thereby driving the rotating piece 5 to rotate continuously. During the continuous rotation, the rotating piece 5 cannot continue to descend. After the rotating piece 5 rotates continuously, the spray water can be continuously sprayed onto the inner wall of the anode tube 2. Compared with the traditional direct spraying method, the spraying time of this structure during the cleaning process is shorter, thereby saving more water.

[0084] By using the cooperation of the spiral groove 121 and the protrusion 132, the rotational motion of the rotating shaft 120 is converted into the descending motion of the turntable 130. The structure is simple, and there is an automatic transition from the descending motion to the rotational motion. Without an additional control mechanism, only the wind wheel 110 is used to drive the rotation of the rotating shaft 120, driving the descent and rotation of the rotating blade 5, which not only reduces the water consumption during the equipment dust cleaning process but also prevents the rotating blade 5 from staying inside the anode tube 2 during the equipment flue gas purification process, thus avoiding the problem of affecting the flue gas discharge.

[0085] In some examples, one end of the elastic member 160 is disposed on the turntable 130, and the other end is disposed on the second mounting bracket 10. The elastic member 160 elastically pushes the turntable 130 upward.

[0086] For example, as Figure 5 shown, one end of the elastic member 160 is mounted on the turntable 130, and the other end is mounted on the second mounting bracket 10. When the turntable 130 descends, the elastic member 160 is compressed; when the wind wheel 110 stops rotating, due to the reset of the elastic member 160, it drives the turntable 130 to rotate and rise in the reverse direction, thereby causing the rotating blade 5 to rise out of the anode tube 2.

[0087] The setting of the elastic member 160 can assist the turntable 130 to rise, reduce the demand for external power, and reduce energy consumption. The elastic member 160 can also play a buffering and stabilizing role, avoiding violent shaking of the turntable 130 during the lifting and lowering process, and ensuring the stable operation of the device. After the turntable 130 rises, it drives the rotating blade 5 to extend out of the anode tube 2, preventing the rotating blade 2 from blocking the anode tube 2 and affecting the flue gas discharge inside the anode tube 2.

[0088] In some examples, the desulfurization tower 18 is connected to the gas outlet end of the denitration member 17 for receiving the denitrated flue gas in the denitration member 17, and the desulfurization tower 18 is connected to the air inlet 12; the demisting tower 19 is connected to the gas outlet 13, and the demisting tower 19 is used to receive the gas in the gas outlet 13 and reduce the humidity of the flue gas.

[0089] For example, as Figure 10 shown, the settings of the denitration member 17, the desulfurization tower 18, and the demisting tower 19 achieve multi-stage treatment of the flue gas, which can effectively remove pollutants such as nitrogen oxides and sulfur oxides in the flue gas and reduce the humidity of the flue gas. Multi-stage treatment can improve the purification degree of the flue gas, make the discharged flue gas more environmentally friendly, and reduce environmental pollution.

[0090] Embodiment 2

[0091] As Figure 1 、 Figure 6 and Figure 10 shown, it shows a treatment method of a treatment device for pre-baked anode calcination flue gas in another embodiment of the present disclosure. The treatment method includes the following steps:

[0092] S1. Pass the flue gas into the denitration component 17 for denitration;

[0093] S2. Pass the denitrated flue gas into the desulfurization tower 18 for desulfurization;

[0094] S3. Pass the denitrated flue gas into the air inlet 12. After the cathode wire 3 is energized, an electric field is formed between the cathode wire 3 and the anode tube 2, and the electric field adsorbs impurities to the inner wall of the anode tube 2;

[0095] S3. Start the spraying component 4, and pass the gas to drive the wind wheel 110 to rotate, thereby controlling the rotating piece 5 to descend and rotate inside the anode tube 2;

[0096] S4. Pass the impurity-removed flue gas into the dewhite tower 19, reduce the temperature of the flue gas below the dew point, and condense the water vapor into liquid water for separation.

[0097] For example, as Figures 1 to 9 shown, use the denitration component 17 to denitrate the raw flue gas generated by the calcination of prebaked anodes. The denitration component 17 adopts a suitable denitration process to convert nitrogen oxides in the flue gas into harmless nitrogen and water. Control parameters such as the reaction temperature, catalyst dosage (if the SCR process is adopted), and reductant injection amount during the denitration process to ensure the best denitration efficiency.

[0098] Transport the denitrated flue gas to the desulfurization tower 18 for desulfurization treatment. An alkaline absorbent, such as limestone slurry in the limestone-gypsum method, is used in the desulfurization tower 18 to chemically react with sulfur dioxide in the flue gas and convert it into calcium sulfite or calcium sulfate precipitate. Optimize the operating parameters of the desulfurization tower 18, such as the liquid-gas ratio, absorbent concentration, and residence time, to improve the desulfurization efficiency. At the same time, regularly monitor and treat the slurry in the desulfurization tower 18 to ensure the stability of its composition and performance.

[0099] Let the flue gas after denitration and desulfurization enter the accommodation space 11 through the air inlet 12 of the main body 1. A number of anode tubes 2 are arranged in sequence in the accommodation space 11, and a cathode wire 3 is inserted into each anode tube 2. Energize the cathode wire 3 to form a strong electric field around the cathode wire 3. Impurities in the flue gas are ionized under the action of the electric field force and are adsorbed onto the inner wall of the anode tube 2, thereby further removing solid impurities in the flue gas.

[0100] Regularly start the spraying component 4 located above the accommodation space 11 to spray water into the anode tube 2. The sprayed water first falls into the water-containing cavity 52 of the rotating piece 5. One end of the guiding member 53 on the lower end surface of the rotating piece 5 is communicated with the water-containing cavity 52, and the other end communicates with the inner wall of the anode tube 2.

[0101] The rotation of the wind wheel 110 is driven by the gas entering the second mounting bracket 10, and the rotation of the turntable 130 is driven by the wind wheel 110 through the rotating shaft 120. The external gear ring 131 on the outer wall of the turntable 130 meshes with the second gear 140, and the second gear 140 drives the first gear 9 to rotate through the connecting rod 150. The first gear 9 meshes with the internal gear ring 54 on the inner wall of the rotating piece 5, thereby driving the rotating piece 5 to rotate. When the rotating piece 5 rotates, the spray water in the water storage cavity 52 is thrown onto the inner wall of the anode tube 2 through the guide member 53 to clean the impurities adsorbed on the inner wall of the anode tube 2.

[0102] The rotation speed and spray time of the rotating piece 5 are controlled to ensure that the inner wall of the anode tube 2 is fully cleaned. At the same time, the rotating piece 5 and the turntable 130 can perform lifting movements as needed to adjust different working states (cleaning state or impurity removal state), improving work efficiency.

[0103] The flue gas after being adsorbed by the electric field and cleaned by the anode tube 2 is discharged from the air outlet 13 of the main body 1 and enters the dehumidification tower 19. The dehumidification tower 19 adopts a suitable dehumidification process, such as condensation dehumidification or adsorption dehumidification, etc., to reduce the humidity of the flue gas, so that the treated flue gas meets the emission standards before being discharged. Efficient purification: Through multi-stage treatment processes such as denitrification, desulfurization, electric field adsorption of impurities, and dehumidification, pollutants such as nitrogen oxides, sulfur oxides, and solid impurities in the flue gas can be effectively removed, reducing environmental pollution.

[0104] This treatment method achieves the following beneficial effects: The present disclosure provides cleaning devices such as the spray member 4 and the rotating piece 5, which can effectively clean the anode tube 2 regularly, prevent equipment blockage and damage caused by impurity accumulation, and extend the service life of the equipment. The design of the rotating piece 5 requires less cleaning time and cleaning water source, and uses the gas to drive the rotation of the wind wheel 110 to provide power for the rotating piece 5, without excessive additional electric drive, and synchronously drives several rotating pieces 5 to act.

[0105] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure and not to limit them. Although the present disclosure has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present disclosure can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present disclosure, and they should all be covered within the scope of the claims of the present disclosure.

Claims

1. A pre-baked anode calcination flue gas treatment device for electrolytic aluminum, characterized in that, Comprising: A main body (1), the main body (1) having a receiving space (11), the receiving space (11) having an air inlet (12) and an air outlet (13); Anode tubes (2), there being a plurality of the anode tubes (2), arranged in sequence in the receiving space (11), and flue gas sequentially passes through the air inlet (12), the anode tubes (2), and the air outlet (13); A cathode wire (3) is disposed through each of the anode tubes (2), and the cathode wire (3) can adsorb impurities in the flue gas to the inner wall of the anode tube (2) after being electrified; A spraying member (4), the spraying member (4) is disposed in the receiving space (11) and is located above the receiving space (11), and the spraying member (4) is used for spraying water to clean the anode tubes (2); Rotating plates (5), there being a plurality of the rotating plates (5), one of the rotating plates (5) is rotatably disposed in each of the anode tubes (2), and the rotating plate (5) can rotate relative to the anode tube (2) to throw the sprayed water towards the inner wall of the anode tube (2); The upper end surface of the rotating plate (5) has a water receiving cavity (52), the lower end surface of the rotating plate (5) has a guiding member (53), the guiding member (53) has a guiding surface (531) extending outward and downward to guide water flow to the inner wall of the anode tube (2), and a guiding hole communicating with the water receiving cavity (52) and used for guiding water flow to the guiding member (53) is provided on the rotating plate (5).

2. The pre-baked anode calcination flue gas treatment device for electrolytic aluminum according to claim 1, characterized in that, The main body (1) includes: A housing (14), both the air inlet (12) and the air outlet (13) are located on the housing (14), and the interior of the housing (14) forms the receiving space (11); An upper mounting frame (61), the upper mounting frame (61) is disposed in the receiving space (11); A lower mounting frame (62), the lower mounting frame (62) is disposed in the receiving space (11) and is correspondingly located below the upper mounting frame (61), and the anode tubes (2) are arranged vertically between the upper mounting frame (61) and the lower mounting frame (62); Mounting columns (7), there being a plurality of the mounting columns (7), a plurality of the mounting columns (7) are arranged horizontally on both the upper mounting frame (61) and the lower mounting frame (62), one end of the cathode wire (3) is disposed on a mounting column (7) of the upper mounting frame (61), the other end is disposed on a mounting column (7) of the lower mounting frame (62), and a plurality of the cathode wires (3) are arranged vertically on each of the mounting columns (7).

3. The pre-baked anode calcination flue gas treatment device for electrolytic aluminum according to claim 2, wherein, The rotating plate (5) has an internal gear ring (54), and further includes: A mounting disc (8), the mounting disc (8) is located inside the anode tube (2), the rotating plate (5) is rotatably disposed on the mounting disc (8), and the rotating plate (5) and the mounting disc (8) are coaxially arranged; A first gear (9), the first gear (9) is eccentrically rotatably disposed on the mounting disc (8), and the first gear (9) meshes with the internal gear ring (54) and is used to drive the rotating plate (5) to rotate.

4. The pre-baked anode calcination flue gas treatment device for electrolytic aluminum according to claim 3, wherein, Further included are: A second mounting bracket (10), which is arranged on the upper mounting bracket (61). The second mounting bracket (10) is of a hollow structure, and gas is allowed to pass through the second mounting bracket (10). A wind wheel (110), which is rotatably arranged in the second mounting bracket (10). The wind wheel (110) can be driven to rotate by the gas. A rotating shaft (120), which is rotatably arranged on the second mounting bracket (10). One end of the rotating shaft (120) is arranged on the wind wheel (110). A turntable (130), which is arranged on the other end of the rotating shaft (120) and is located outside the second mounting bracket (10). The turntable (130) has an external gear ring (131). A second gear (140), which meshes with the external gear ring (131). A connecting rod (150), which is connected between the first gear (9) and the second gear (140) and is used to drive the first gear (9) to rotate under the action of the second gear (140).

5. The pre-baked anode calcination flue gas treatment device for electrolytic aluminum according to claim 4, characterized in that, The rotating piece (5) is arranged to be lifted and lowered in the anode tube (2), and the turntable (130) is arranged to be lifted and lowered on the rotating shaft (120).

6. The pre-baked anode calcination flue gas treatment device for electrolytic aluminum according to claim 4, characterized in that, The rotating shaft (120) has a spiral groove (121), and the inner wall of the turntable (130) has a protrusion (132) matching with the spiral groove (121). The turntable (130) can descend under the cooperation of the protrusion (132) and the spiral groove (121), and after descending, it is used to drive the rotating piece (5) to extend into the anode tube (2).

7. A pre-baked anode calcination flue gas treatment device for electrolytic aluminum according to claim 4, characterized in that, Further included are: An elastic member (160), one end of which is arranged on the turntable (130), and the other end is arranged on the second mounting bracket (10). The elastic member (160) is used to elastically push the turntable (130) upward.

8. The pre-baked anode calcination flue gas treatment device for electrolytic aluminum according to claim 1, wherein, Further included are: A denitration component (17); A desulfurization tower (18), which is connected to the gas outlet end of the denitration component (17) and is used to receive the denitrified flue gas in the denitration component (17). The desulfurization tower (18) is connected to the air inlet (12). A demisting tower (19), which is connected to the gas outlet (13). The demisting tower (19) is used to receive the flue gas from the gas outlet (13) and reduce the humidity of the flue gas.

9. A method for treating calcination flue gas of pre-baked anodes for electrolytic aluminum, using the device for treating calcination flue gas of pre-baked anodes for electrolytic aluminum according to any one of claims 1-8, characterized in that, The treatment method of the treatment device includes the following steps: S1. Pass the flue gas into the denitration component (17) for denitration; S2. Pass the denitrified flue gas into the desulfurization tower (18) for desulfurization; S3. Pass the desulfurized flue gas into the air inlet (12). After the cathode wire (3) is electrified, an electric field is formed between the cathode wire (3) and the anode tube (2), and the electric field adsorbs impurities to the inner wall of the anode tube (2); S3. Start the spraying component (4), and pass the gas to drive the wind wheel (110) to rotate, thereby controlling the rotating piece (5) to descend and rotate in the anode tube (2); S4. Pass the impurity-removed flue gas into the demisting tower (19), reduce the temperature of the flue gas below the dew point, and separate the water vapor into liquid water.

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