Flue gas desulfurization device for secondary aluminum ash recovery based on low-temperature oxidation method

Abstract

The utility model discloses a flue gas desulfurization device for secondary aluminum ash recovery based on a low-temperature oxidation method, and relates to the technical field of aluminum ash flue gas desulfurization, the flue gas desulfurization device comprises a desulfurization box, one side of the desulfurization box is provided with a gas inlet, and the middle end of the gas inlet is provided with a filter assembly; the filter assembly comprises a filter screen for filtering impurities such as particulate matters and smoke dust in flue gas and a cleaning mechanism for cleaning the filter screen to prevent the filter screen from being blocked, an oxidant circulating pool is arranged at the bottom in the desulfurization box, and a spraying main pipe is arranged in the desulfurization box; a swing assembly for driving the spraying main pipe to swing back and forth is arranged on one side of the spraying main pipe, a spraying head is connected to the lower portion of the spraying main pipe, flue gas is introduced into the desulfurization box from the gas inlet, the flue gas is pretreated through a filter screen at the middle end of the gas inlet, impurities such as particulate matter and smoke dust in the flue gas are filtered out, and the flue gas is discharged into the desulfurization box; the filter screen can be cleaned through the cleaning mechanism, so that the filter screen is prevented from being blocked, and the filtering effect is prevented from being influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum ash flue gas desulfurization, in particular to a flue gas desulfurization device for secondary aluminum ash recovery based on a low-temperature oxidation method. Background Technique

[0002] Sulfides in flue gas (mainly sulfur dioxide SO2) are one of the main air pollutants. It not only causes the formation of acid rain but also has a negative impact on human health. With the increasingly strict environmental protection regulations, the emission limits for sulfides in flue gas are becoming more and more stringent. Therefore, the development of efficient flue gas desulfurization technology is crucial for the sustainable development of the aluminum ash recovery industry.

[0003] Chinese Patent CN110624379B discloses a flue gas low-temperature desulfurization and denitrification process based on a wet oxidation method, including an oxidation absorption tower body, an oxidant circulation pool, an air inlet, a slurry circulation pool, a demisting tower body, a demister, an air outlet, and a spraying device; the flue gas is introduced into the oxidation absorption tower body of the wet oxidation desulfurization and denitrification tower through the air inlet, sprayed and oxidized through the spraying device, then passes through the clean gas composite filler A, and then enters the basic absorption tower body evenly through a plurality of connecting pipes. After being sprayed and treated through the spraying device, it passes through the clean gas composite filler B, and then enters the demisting tower body through the connecting pipe. After being demisted by the demister in the demisting tower body, the purified gas is discharged through the air outlet.

[0004] When the above-mentioned prior art is used, the flue gas is directly transported from the air inlet to the oxidation absorption tower body and sprayed and oxidized through the spraying device, but there is a lack of pretreatment of the flue gas. Since the flue gas may contain impurities such as particulate matter, tar, and soot, these impurities will cover the surface of the desulfurizer, hinder the effective contact between the desulfurizer and sulfides such as sulfur dioxide in the flue gas, resulting in incomplete desulfurization reaction and thus reducing the desulfurization efficiency. Content of the Utility Model

[0005] Aiming at the above problems, a flue gas desulfurization device for secondary aluminum ash recovery based on a low-temperature oxidation method is provided. By setting a filter screen, impurities such as particulate matter, tar, and soot in the flue gas are filtered, solving the technical problems of incomplete flue gas desulfurization reaction and reduced desulfurization efficiency.

[0006] To solve the problems of the existing technology, the utility model provides a flue gas desulfurization device for secondary aluminum ash recovery based on the low-temperature oxidation method, which includes a desulfurization tank. An air inlet is arranged on one side of the desulfurization tank, and a filtering component is arranged at the middle position of the air inlet. The filtering component includes a filter screen for filtering impurities such as particulate matter and soot in the flue gas and a cleaning mechanism for cleaning the filter screen to prevent it from being blocked. An oxidant circulation pool is arranged at the bottom inside the desulfurization tank. A spray main pipe is arranged inside the desulfurization tank. A swing component for driving the spray main pipe to swing back and forth is arranged on one side of the spray main pipe. Spray heads are connected below the spray main pipe. One side of the oxidant circulation pool is connected with a circulation pipe, and the other end of the circulation pipe is connected with the spray main pipe. A circulation pump is arranged on the circulation pipe.

[0007] Preferably, the cleaning mechanism includes a filtering pipeline, a rotating rod and a brush; the filtering pipeline is arranged at the middle position of the air inlet, and the filter screen is arranged inside the filtering pipeline; the rotating rod is installed inside the filtering pipeline and is located on one side of the filter screen, and a driving component for driving the rotating rod to rotate reciprocally is installed above the rotating rod; the brush is installed on one side of the rotating rod.

[0008] Preferably, the filter screen is a hollow hemispherical net structure, and the diameter of the filter screen is equal to the inner cavity diameter of the filtering pipeline.

[0009] Preferably, the driving component includes a driving box, a first gear, a moving ring, a first rack, a second rack, a second gear and a motor; the driving box is installed above the filtering pipeline; one end of the rotating rod extends into the driving box through the filtering pipeline; the first gear is installed at the extending end of the rotating rod; the moving ring is slidably connected inside the driving box; the first rack is installed on the side of the moving ring close to the first gear; the second rack is installed inside the moving ring; the motor is installed above the driving box; the second gear is installed at the output end of the motor, and the second gear meshes with the second rack.

[0010] Preferably, a collection box is installed below the filtering pipeline, and through holes are arranged at the contact position between the collection box and the filtering pipeline.

[0011] Preferably, the swing component includes a rotating ring, a sliding rod, a sliding sleeve, a connecting block, a rotating block and a motor; the rotating ring is rotatably connected to the inner wall of the desulfurization tank through a rotating shaft; the sliding rod is installed above the rotating ring; the sliding sleeve is slidably connected to the sliding rod; the connecting block is installed on one side of the sliding sleeve; the rotating block is installed on one side of the connecting block; the motor is installed on the side wall of the desulfurization tank, and the output end of the motor extends into the desulfurization tank and is connected to the rotating block.

[0012] Preferably, a demisting tower body is installed above the desulfurization tank, a demister is arranged inside the demisting tower body, and an air outlet is arranged above the demisting tower body.

[0013] The beneficial effects of the present utility model compared with the prior art are as follows:

[0014] 1. By introducing flue gas from the air inlet into the desulfurization tank, the filter screen at the middle end of the air inlet pre-treats the flue gas, filters out impurities such as particulate matter and soot in the flue gas, and the cleaning mechanism can clean the filter screen to prevent blockage of the filter screen and affect the filtering effect.

[0015] 2. The filtered flue gas enters the desulfurization tank, and the oxidant in the oxidant circulation tank is transported from the circulation pipe to the spray main pipe by the circulation pump. The spray head below the spray main pipe sprays the flue gas, and the swing assembly drives the spray main pipe to swing back and forth, so as to uniformly spray the flue gas and make the flue gas fully contact with the oxidant. Description of the Drawings

[0016] Figure 1 It is a perspective view of the flue gas desulfurization device for secondary aluminum ash recovery based on the low-temperature oxidation method from the first perspective.

[0017] Figure 2 It is a cross-sectional view of the flue gas desulfurization device for secondary aluminum ash recovery based on the low-temperature oxidation method from the front view perspective.

[0018] Figure 3 It is the enlarged view at position A in the Figure 2 flue gas desulfurization device for secondary aluminum ash recovery based on the low-temperature oxidation method.

[0019] Figure 4 It is a perspective view of the air inlet and the filter pipeline in the flue gas desulfurization device for secondary aluminum ash recovery based on the low-temperature oxidation method.

[0020] Figure 5 It is a sectional perspective view of the filter pipeline in the flue gas desulfurization device for secondary aluminum ash recovery based on the low-temperature oxidation method.

[0021] Figure 6 It is an overall perspective view of the spray main pipe, the spray head and the swing assembly in the flue gas desulfurization device for secondary aluminum ash recovery based on the low-temperature oxidation method.

[0022] The reference numerals in the figures are: 1, desulfurization tank; 2, air inlet; 3, filter assembly; 31, filter pipeline; 32, filter screen; 33, rotating rod; 34, brush; 35, drive box; 36, first gear; 37, moving ring; 38, first rack; 39, second rack; 310, second gear; 311, motor; 312, collection box; 4, oxidant circulation tank; 5, circulation pipe; 6, circulation pump; 7, spray main pipe; 8, spray head; 9, demisting tower body; 10, swing assembly; 101, rotating ring; 102, sliding rod; 103, sliding sleeve; 104, connecting block; 105, rotating block; 106, motor; 11, air outlet. Detailed implementation manners

[0023] To further understand the features, technical means, specific purposes and functions achieved by the present utility model, the present utility model will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0024] See Figures 1 to 6 As shown, the present utility model provides a flue gas desulfurization device for secondary aluminum ash recovery based on the low-temperature oxidation method, including a desulfurization tank 1. An air inlet 2 is arranged on one side of the desulfurization tank 1. A filtering component 3 is arranged at the middle position of the air inlet 2. The filtering component 3 includes a filter screen 32 for filtering impurities such as particulate matters and soot in the flue gas and a cleaning mechanism for cleaning the filter screen 32 to prevent the filter screen 32 from being blocked. An oxidant circulation pool 4 is arranged at the bottom inside the desulfurization tank 1. A spray main pipe 7 is arranged inside the desulfurization tank 1. A swing component 10 for driving the spray main pipe 7 to swing back and forth is arranged on one side of the spray main pipe 7. Spray heads 8 are connected below the spray main pipe 7. One side of the oxidant circulation pool 4 is connected with a circulation pipe 5. The other end of the circulation pipe 5 is connected with the spray main pipe 7. A circulation pump 6 is arranged on the circulation pipe 5.

[0025] By introducing the flue gas into the desulfurization tank 1 from the air inlet 2, the flue gas is pretreated by the filter screen 32 at the middle of the air inlet 2, and impurities such as particulate matters and soot in the flue gas are filtered. The filter screen 32 can be cleaned by the cleaning mechanism to prevent the filter screen 32 from being blocked and affecting the filtering effect. The filtered flue gas enters the desulfurization tank 1. The oxidant in the oxidant circulation pool 4 is transported from the circulation pipe 5 to the spray main pipe 7 through the circulation pump 6. The flue gas is sprayed by the spray heads 8 below the spray main pipe 7, and the swing component 10 drives the spray main pipe 7 to swing back and forth, so as to spray the flue gas evenly, making the flue gas fully contact with the oxidant.

[0026] See Figures 1 to 5 As shown, the cleaning mechanism includes a filtering pipeline 31, a rotating rod 33 and a brush 34. The filtering pipeline 31 is arranged at the middle position of the air inlet 2. The filter screen 32 is arranged inside the filtering pipeline 31. The rotating rod 33 is installed inside the filtering pipeline 31 and is located on one side of the filter screen 32. A driving component for driving the rotating rod 33 to rotate reciprocally is installed above the rotating rod 33. The brush 34 is installed on one side of the rotating rod 33.

[0027] When the flue gas passes through the filtering pipeline 31, the flue gas is filtered by the filter screen 32 inside the filtering pipeline 31. The driving component drives the rotating rod 33 to rotate reciprocally, and then the rotating rod 33 drives the brush 34 to clean the filter screen 32, thereby preventing the filter screen 32 from being blocked and affecting the filtering effect.

[0028] See Figure 3 and Figure 5As shown, the filter screen 32 is a hollow hemispherical net structure, and the diameter of the filter screen 32 is equal to the inner cavity diameter of the filter pipe 31.

[0029] By setting the filter screen 32 as a hollow hemispherical net structure, the diameter of the filter screen 32 is equal to the inner cavity diameter of the filter pipe 31, so that the space inside the filter pipe 31 can be fully utilized, and the impurities in the flue gas inside the filter pipe 31 can be intercepted and removed more effectively.

[0030] See Figures 1 to 5 As shown, the driving component includes a driving box 35, a first gear 36, a moving ring 37, a first rack 38, a second rack 39, a second gear 310 and a motor 311; the driving box 35 is installed above the filter pipe 31; one end of the rotating rod 33 penetrates through the filter pipe 31 and extends into the driving box 35; the first gear 36 is installed at the extending end of the rotating rod 33; the moving ring 37 is slidably connected inside the driving box 35; the first rack 38 is installed on one side of the moving ring 37 close to the first gear 36; the second rack 39 is installed inside the moving ring 37; the motor 311 is installed above the driving box 35; the second gear 310 is installed on the output end of the motor 311, and the second gear 310 meshes with the second rack 39.

[0031] By starting the motor 311 inside the driving box 35, the motor 311 drives the second gear 310 to rotate. Through the meshing of the second gear 310 with the second rack 39 inside the moving ring 37, the moving ring 37 is driven to move reciprocally. Then, through the meshing of the first rack 38 on the outside of the moving ring 37 with the first gear 36, when the moving ring 37 moves, the first gear 36 is driven to rotate, and then the rotating rod 33 is driven to rotate reciprocally by the first gear 36, so as to clean the filter screen 32.

[0032] See Figures 3 to 5 As shown, a collection box 312 is installed below the filter pipe 31, and through holes are provided at the contact position between the collection box 312 and the filter pipe 31.

[0033] Due to the gravity of the impurities in the flue gas, they will fall into the collection box 312 from the through holes along the filter screen 32, which is convenient for collecting them.

[0034] See Figure 2 and Figure 6As shown, the swing assembly 10 includes a rotating ring 101, a sliding rod 102, a sliding sleeve 103, a connecting block 104, a rotating block 105 and a motor 106; the rotating ring 101 is rotatably connected to the inner wall of the desulfurization tank 1 through a rotating shaft; the sliding rod 102 is installed above the rotating ring 101; the sliding sleeve 103 is slidably connected to the sliding rod 102; the connecting block 104 is installed on one side of the sliding sleeve 103; the rotating block 105 is installed on one side of the connecting block 104; the motor 106 is installed on the side wall of the desulfurization tank 1, and the output end of the motor 106 extends into the desulfurization tank 1 and is connected to the rotating block 105.

[0035] When the flue gas enters the interior of the desulfurization tank 1, the oxidant in the oxidant circulation tank 4 is transported from the circulation pipe 5 to the spray main pipe 7 by the circulation pump 6, and the flue gas is sprayed by the spray heads 8 below the spray main pipe 7. By starting the motor 106, the rotating block 105 is driven to rotate by the motor 106, then the connecting block 104 is driven to move by the rotating block 105, the sliding sleeve 103 is driven to slide on the sliding rod 102 by the connecting block 104, the rotating ring 101 is driven to rotate by the sliding rod 102, and one side of the spray main pipe 7 is fixedly connected to the rotating ring 101, and the other side of the spray main pipe 7 is rotatably connected to the inner wall of the desulfurization tank 1. Thus, when spraying, the spray main pipe 7 is swung, so that the contact between the flue gas and the oxidant is more sufficient, and the desulfurization effect is improved.

[0036] See Figure 1 As shown, a demisting tower body 9 is installed above the desulfurization tank 1. A demister is arranged inside the demisting tower body 9, and an air outlet 11 is arranged above the demisting tower body 9.

[0037] The desulfurized flue gas enters the upper demisting tower body 9, and the demister inside the demisting tower body 9 performs demisting treatment on the flue gas, and then discharges from the air outlet 11.

[0038] The above embodiments only represent one or several implementation manners of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A flue gas desulfurization device for secondary aluminum ash recovery based on low temperature oxidation method, characterized in that: The invention comprises a desulfurization box (1), wherein an air inlet (2) is arranged on one side of the desulfurization box (1), a filter assembly (3) is arranged at the middle end of the air inlet (2), the filter assembly (3) comprises a filter screen (32) for filtering impurities such as particulate matter and smoke in the flue gas, and a cleaning mechanism for cleaning the filter screen (32) to prevent the filter screen (32) from being blocked, an oxidant circulation pool (4) is arranged at the bottom of the desulfurization box (1), a spray pipe (7) is arranged in the desulfurization box (1), a swing assembly (10) for driving the spray pipe (7) to swing back and forth is arranged on one side of the spray pipe (7), a spray head (8) is connected to the bottom of the spray pipe (7), a circulation pipe (5) is connected to one side of the oxidant circulation pool (4), one end of the circulation pipe (5) is connected to the oxidant circulation pool (4), and the other end of the circulation pipe (5) is connected to the spray pipe (7), and a circulation pump (6) is arranged on the circulation pipe (5).

2. The flue gas desulfurization device for secondary aluminum ash recovery based on low temperature oxidation method according to claim 1 is characterized in that: The cleaning mechanism comprises a filtering pipe (31), a rotating rod (33) and a brush (34); The filter pipe (31) is arranged at the middle end of the air inlet (2), and the filter screen (32) is arranged inside the filter pipe (31); The rotating rod (33) is installed in the filter pipe (31) and is located on one side of the filter screen (32). A driving component for driving the rotating rod (33) to reciprocate is installed above the rotating rod (33); The brush (34) is installed on one side of the rotating rod (33).

3. The flue gas desulfurization device for secondary aluminum ash recovery based on low temperature oxidation method according to claim 1 is characterized in that: The filter screen (32) is a hollow hemispherical mesh structure, and the diameter of the filter screen (32) is equal to the inner cavity diameter of the filter pipe (31).

4. The flue gas desulfurization device for secondary aluminum ash recovery based on low temperature oxidation method according to claim 2 is characterized in that: The driving component comprises a driving box (35), a first gear (36), a moving ring (37), a first rack (38), a second rack (39), a second gear (310) and a motor (311); The driving box (35) is installed above the filter pipe (31); one end of the rotating rod (33) penetrates the filter pipe (31) and extends into the driving box (35); The first gear (36) is mounted on the extended end of the rotating rod (33); The moving ring (37) is slidably connected in the driving box (35); The first rack (38) is installed on a side of the moving ring (37) close to the first gear (36); The second rack (39) is installed on the inner side of the moving ring (37); The motor (311) is installed above the drive box (35); The second gear (310) is mounted on the output end of the motor (311), and the second gear (310) is meshed with the second rack (39).

5. The flue gas desulfurization device for secondary aluminum ash recovery based on low temperature oxidation method according to claim 2 is characterized in that: A collecting box (312) is installed below the filtering pipe (31), and a through hole is provided at the contact position between the collecting box (312) and the filtering pipe (31).

6. The flue gas desulfurization device for secondary aluminum ash recovery based on low temperature oxidation method according to claim 1 is characterized in that: The swing assembly (10) comprises a rotating ring (101), a sliding rod (102), a sliding sleeve (103), a connecting block (104), a rotating block (105) and a motor (106); The rotating ring (101) is rotatably connected to the inner wall of the desulfurization box (1) via a rotating shaft; The sliding rod (102) is installed above the rotating ring (101); The sliding sleeve (103) is slidably connected to the sliding rod (102); The connecting block (104) is installed on one side of the sliding sleeve (103); The rotating block (105) is installed on one side of the connecting block (104); The motor (106) is installed on the side wall of the desulfurization box (1), and the output end of the motor (106) extends into the desulfurization box (1) and is connected to the rotating block (105).

7. The flue gas desulfurization device for secondary aluminum ash recovery based on low temperature oxidation method according to claim 6 is characterized in that: A demister tower body (9) is installed above the desulfurization box (1), a demister is arranged inside the demister tower body (9), and an air outlet (11) is arranged above the demister tower body (9).

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