Waste gas treatment device for aluminum part production

Abstract

The utility model discloses a waste gas treatment device for aluminum part production, which comprises a tower body structure for waste gas treatment, the tower body structure is formed by a multi-layer structure of a spray layer and a packing layer arranged below the spray layer, two groups of negative pressure components are arranged on a tower body and are distributed at the upper end and the lower end of the tower body, and the spray layer is arranged in the tower body. The negative pressure assembly at the lower end of the tower body is installed at an air inlet formed in the bottom of the tower body and connected with a main body pipeline at the air inlet, the negative pressure assembly at the upper end of the tower body is installed on one side below an exhaust port formed in the top of the tower body, and a flow guide plate is arranged in the tower body; and the flow guide plates are arc-shaped and are respectively arranged on the air paths corresponding to the negative pressure components in the tower body to form convection. The waste gas treatment device is a novel waste gas treatment device for aluminum part production.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum production, in particular to a waste gas treatment device for aluminum production. Background Art

[0002] Aluminum plants produce a lot of waste gas during the production of aluminum parts, including harmful gases such as nitrogen oxides, sulfur dioxide, hydrofluoride, aluminum smoke, etc. These waste gases pose a great threat to the environment and human health. In order to reduce the impact of waste gas emissions on production environment safety and environmental protection, waste gas treatment is an indispensable and important link in the production process of aluminum parts.

[0003] At present, common waste gas treatment methods in the prior art include physical adsorption, chemical absorption, activated carbon adsorption and condensation, etc. The corresponding waste gas treatment devices usually adopt a variety of technologies and treatment methods for combined treatment to achieve the best treatment effect. However, the existing waste gas treatment devices usually use the tower body structure of a spray tower to purify and discharge the waste gas. The overall volume of this tower body structure is usually large and has a certain span. Although it is helpful for the circulation and treatment of the waste gas, the spray structure inside the tower body is mostly arranged with a multi-layer structure of a spray layer and a packing layer placed below. There is often a great similarity between the layer structures of this multi-layer structure, resulting in basically the same effect and relatively single function. While increasing the overall height of the tower body, the treatment effect of the waste gas in the tower and the utilization rate of the space in the tower are also less than ideal. In addition, for factories with large waste gas emissions, in order to meet the waste gas treatment and emission requirements, it is usually adopted to add multiple sets of purification towers or spray tower tower structures. Although it can meet the basic use needs, it often requires a certain amount of installation and use space, and the repeated stacking of the multi-layer structure of waste gas treatment in the tower is also prone to waste of the use space in the tower, increasing unnecessary use costs. Utility Model Content

[0004] The utility model aims to provide a waste gas treatment device for aluminum parts production, which can further improve the utilization rate of the internal space of the tower body and further improve the waste gas treatment effect to meet different usage requirements.

[0005] The technical solution adopted by the utility model to solve the above problems is:

[0006] A waste gas treatment device for aluminum parts production, including a tower structure for waste gas treatment composed of a multilayer structure of a spray layer and a packing layer arranged thereunder, a negative pressure assembly being arranged on the tower body, the negative pressure assembly being arranged in two groups and distributed at the upper and lower ends of the tower body, the negative pressure assembly at the lower end of the tower body being installed at an air inlet provided at the bottom of the tower body and being connected to a main pipeline at the air inlet, the negative pressure assembly at the upper end of the tower body being installed at a side below an exhaust port provided at the top of the tower body, a guide plate being arranged inside the tower body, the guide plate being arc-shaped and being respectively installed on wind paths corresponding to the negative pressure assemblies inside the tower body to form convection.

[0007] Further: the guide plate includes a first guide plate and a second guide plate, the first guide plate adopts an arc plate structure and is installed on one side below the top exhaust port of the tower body and fixed at a position corresponding to the negative pressure component, and the second guide plate is arranged in a "ladder-like" structure and has a plurality of guide channels opened inside.

[0008] Furthermore: the guide channel is arranged in an arc shape and its arc surface is arranged from low to high in the direction away from the negative pressure component.

[0009] Furthermore: a hood is rotatably arranged on the top trapezoidal surface of the second "ladder-shaped" air guide plate, and a number of turbulence plates are arranged around the bottom and side surfaces of the hood.

[0010] Further: a partition is arranged on the packing layer corresponding to the first guide plate below the tower body to form two corresponding independent cavities, the first guide plate below the exhaust port at the top of the tower body is placed above the cavity on one side, and a filter element is arranged on the installation position connected to the first guide plate below the exhaust port and placed above the cavity on the other side.

[0011] Furthermore: a second filter element is arranged in the exhaust duct connected to the exhaust port at the top of the tower body, and a protective net is also installed at the air outlet arranged in the main body of the negative pressure component.

[0012] Furthermore: the spray layer includes multiple groups of spray heads evenly distributed in the tower body and a circulating pump installed at the bottom of the tower body connected to them through water pipes, and pipe valves are provided on the corresponding pipe bodies of the water pipes connected to the multiple groups of spray heads.

[0013] Further: the packing layer includes a filter assembly formed by multiple groups of filter screens and filter plates evenly distributed inside the tower body and placed under multiple groups of spray heads. The filter screen adopts an internal hollow mesh bag structure and is placed above the filter plate. The filter holes on the multiple groups of filter plates are set in different sizes and arranged in sequence inside the tower body.

[0014] Furthermore: the tower body also includes a second tower body placed at the front end and connected to its tower body air inlet through the main pipeline, and the second tower body includes a multi-layer structure formed by a spray layer and a packing layer placed below it.

[0015] Further: an air collecting hood is arranged at the air intake port at the front end of the main pipeline, and the air collecting hood includes an outer cover, a tight hoop and an inner cover. The inner cover is made of elastic material, connected to the air intake port and arranged in a trumpet shape. The outer cover is fixed on the main pipeline at the air intake port outside the inner cover. The tight hoop is adapted to be arranged on the periphery of the inner cover and is slidably arranged on the outer cover through multiple groups of sliding rods and adjusting parts arranged on the outer cover and multiple groups of compression springs arranged on its outer side.

[0016] Compared with the prior art, the utility model has the following advantages and effects:

[0017] The utility model discloses a waste gas treatment device for aluminum parts production. On the basis of a conventional tower body structure, a negative pressure component and a guide plate arranged on its corresponding wind path are added to the waste gas treatment device for aluminum parts production, so that a waste gas circulation channel within a certain range is formed inside a tower body structure with a certain height, which can not only further improve the waste gas purification and treatment effect inside the tower body, but also effectively utilize the internal space of the tower body, extend the flow path of the waste gas inside the tower body, and meet different waste gas treatment and emission requirements. At the same time, under the premise of meeting the emission requirements, the number of spray layers and packing layers can be appropriately reduced, which can further reduce the overall height of the tower body structure, thereby facilitating the installation and maintenance of the tower body and further reducing the use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of a waste gas treatment device for aluminum parts production according to an embodiment of the utility model.

[0019] Figure 2 It is an enlarged view of the internal structure of the tower body of the utility model embodiment.

[0020] Figure 3 It is an enlarged view of the internal structure of the second tower body of the utility model embodiment.

[0021] Figure 4 It is an enlarged view of the gas collecting hood of the embodiment of the utility model.

[0022] Figure numbers: tower body 100, air inlet 101, exhaust port 102, exhaust pipe 1021, second filter element 10211, filter element 103, second tower body 110, main pipeline 120, air intake port 121, negative pressure component 1, protective net 11, guide plate 2, first guide plate 21, second guide plate 22, guide channel 221, wind hood 222, spoiler 2221, spray layer 3, spray head 31, water pipe 32, pipe valve 321, circulation pump 33, mixed liquid 34, filling layer 4, filter screen 41, filter plate 42, filter hole 421, filling ball 43, air collecting hood 5, outer cover 51, slide rod 511, adjustment member 512, compression spring 513, tight hoop 52, inner cover 53. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0024] See also Figure 1-2 The present embodiment relates to a waste gas treatment device for aluminum parts production, including a tower body 100 structure for waste gas treatment composed of a multilayer structure of a spray layer 3 and a packing layer disposed thereunder, wherein a negative pressure assembly 1 is disposed on the tower body 100, and the negative pressure assembly 1 is disposed in two groups and distributed at the upper and lower ends of the tower body 100, the negative pressure assembly 1 at the lower end of the tower body 100 is installed at an air inlet 101 disposed at the bottom of the tower body 100 and is connected to a main pipeline 120 at the air inlet 101, the negative pressure assembly 1 at the upper end of the tower body 100 is installed at a side below an exhaust port 102 disposed at the top of the tower body 100, and a guide plate 2 is disposed inside the tower body 100, and the guide plate 2 is arc-shaped and is respectively installed on the wind path corresponding to the negative pressure assembly 1 inside the tower body 100 to form convection.

[0025] Specifically in this embodiment, the specific structural arrangement inside the tower body 100 can be seen in Figure 2As shown, the waste gas generated during the production of aluminum parts can flow through the main pipe through the air inlet 101 and enter the tower body 100 under the action of the negative pressure component 1. The negative pressure component 1 adopts a traditional negative pressure fan structure. The waste gas accumulated in the tower body 100 can be purged by the negative pressure fan. In the process of drifting upward along the top of the tower body 100, the multi-layer structure formed by the spray layer 3 and the filler layer arranged below the tower body 100 using a conventional structure can spray and purify the waste gas. At the same time, the negative pressure fan can purge the waste gas in the tower while the guide plate 2 arranged on the corresponding wind path can play a certain guiding role on the waste gas accumulated in the tower body 100. In addition, during the operation of the negative pressure fan, the arc-shaped guide plates 2 at the upper and lower ends of the tower body 100 can form a certain waste gas circulation channel, so that the waste gas accumulated to a certain content in the tower body 100 forms a process of circulating up and down along the inside of the tower body 100, so that the waste gas in the tower body 100 can be repeatedly passed through The multi-layer structure formed by the spray layer 3 and the packing layer placed thereunder is further purified and treated. During this process, the exhaust gas in the tower body 100 is continuously circulated and dispersed until it is discharged through the exhaust port 102 at the top of the tower body 100 to complete the exhaust gas purification and treatment process. This exhaust gas treatment device for aluminum parts production is based on the conventional tower body 100 structure, and is additionally provided with a negative pressure component 1 and a guide plate 2 arranged on its corresponding wind path, thereby forming an exhaust gas circulation channel within a certain range for the interior of the tower body 100 structure with a certain height, which can not only further improve the exhaust gas purification and treatment effect inside the tower body 100, but also effectively utilize the internal space of the tower body 100, extend the exhaust gas circulation path inside the tower body 100, and meet different exhaust gas treatment and emission requirements. At the same time, on the premise of meeting the emission requirements, the number of layers of the spray layer 3 and the packing layer can be appropriately reduced, which can further reduce the overall height of the tower body 100 structure, thereby facilitating the installation and maintenance of the tower body 100 and further reducing the use cost.

[0026] The guide plate 2 includes a first guide plate 21 and a second guide plate 22. The first guide plate 21 is installed in a curved plate structure at a position corresponding to the negative pressure component 1 below the top exhaust port 102 in the tower body 100. The second guide plate 22 is arranged in a "ladder-like" structure and has a plurality of guide channels 221 opened therein. The exhaust gas placed at the bottom of the tower through the air inlet 101 can be first divided into two parts and flow upward along the top of the tower body 100 through the second guide plate 22. A part of the exhaust gas can flow upward along the curved surface of the second guide plate 22 or through the second guide plate 22 directly toward the top of the tower body 100. The part reaching the top of the tower body 100 Part of the exhaust gas can continue to flow downward along the bottom of the tower through the first guide plate 21 with an arc-shaped plate structure, and the other part of the exhaust gas can pass through a number of guide channels 221 opened inside the second guide plate 22 under the action of the negative pressure component 1 to the other side and flow upward along the top of the tower body 100. The setting of the adaptive shapes of the first guide plate 21 and the second guide plate 22 can further improve the fluidity and distribution uniformity of the exhaust gas inside the tower body 100, and improve the exhaust gas treatment effect. The several guide channels 221 opened in the second guide plate 22 can reduce the long-term accumulation and retention of exhaust gas at the bottom of the tower, which affects the exhaust gas treatment and emission, and improve the stability and comprehensiveness of the exhaust gas treatment.

[0027] The guide channel 221 is arranged in an arc shape and its arc surface is arranged from low to high in the direction away from the negative pressure component 1. The guide channel 221 arranged in this way cooperates with the setting of the spray layer 3 inside the tower body 100, which can effectively discharge the spray agent, avoid the spray agent remaining in the guide channel 221 and affect the exhaust gas treatment effect and the recycling of the spray agent, and ensure the working stability during the exhaust gas treatment process.

[0028] A hood 222 is rotatably provided on the top trapezoidal surface of the second "ladder-shaped" guide plate 22, and some interference flow plates 2221 are arranged around the bottom and sides of the hood 222. The arrangement of the hood 222 on the top of the second guide plate 22 can cooperate with the negative pressure fan at the air inlet to blow along the interference flow plates 2221 arranged around the bottom and sides of the hood 222, so that the hood 222 can rotate. The rotation of the hood 222, on the one hand, helps to improve the diffusion speed and distribution uniformity of the exhaust gas in the tower, and on the other hand, the spray agent flowing down through the spray layer 3 from above can also be centrifuged under the rotation of the hood 222, which helps to mix the spray agent and the exhaust gas, thereby improving the exhaust gas purification and treatment effect. At the same time, it can also reduce the residue of the spray agent on the second guide plate 22, which is beneficial to the recycling of the spray agent and effectively improves the utilization rate of the spray agent, so as to achieve the best use effect.

[0029] A partition is arranged on the packing layer corresponding to the first guide plate 21 in the tower body 100 to form two corresponding independent cavities. The first guide plate 21 below the exhaust port 102 at the top of the tower body 100 is placed above the cavity on one side. A filter element 103 is arranged at the installation position connected to the first guide plate 21 below the exhaust port 102 and placed above the cavity on the other side. The arrangement of the partition allows the exhaust gas to be purified and processed once through the cavity at the corresponding position on the packing layer below under the action of the first guide plate 21, and then to be purified and processed twice through the cavity on the other side and to be discharged after being filtered through the filter element 103 at the corresponding position below the upper exhaust port 102, which helps to improve the distribution and contact effect of the exhaust gas inside the tower body 100, thereby The comprehensiveness of deep purification and treatment of exhaust gas is further improved, and the phenomenon of direct discharge from the top of the tower body 100 through the exhaust port 102 affecting the purification and treatment effect is reduced. In addition, under the action of the partition, different numbers of filling balls 43 can be placed in the independent cavity formed by the filling layer. Specifically, the number of filling balls 43 in the cavity on one side below the filter element 103 can be greater than the number of filling balls 43 in the cavity on the other side corresponding to the first guide plate 21, so that the exhaust gas in the tower body 100 can be fully purified and treated and discharged from the exhaust port 102 through the filter element 103, thereby improving the purification and treatment effect of the exhaust gas while reducing the pollution to the external environment caused by direct discharge or incomplete treatment of the exhaust gas and further harm to the human body.

[0030] A second filter element 10211 is arranged in the exhaust duct 1021 connected to the exhaust port 102 at the top of the tower body 100, and a protective net 11 is also installed at the air outlet arranged in the main body of the negative pressure component 1. The setting of the second filter element 10211 in the exhaust duct 1021 can further filter and remove impurities when the exhaust gas purified and treated inside the tower body 100 is discharged, ensuring that the emission meets environmental protection standards and meets different emission requirements. At the same time, it can also reduce the leakage of exhaust gas inside the tower body 100 when abnormal situations occur. In addition, the setting of the protective net 11 can prevent impurities or spray agents generated inside the tower body 100 from entering the negative pressure component 1 and affecting the normal operation of the equipment, thereby improving the stability of equipment operation.

[0031] The spray layer 3 includes a plurality of spray heads 31 evenly distributed in the tower body 100 and a circulating pump 33 connected to the tower body 100 through a water pipe 32. The corresponding pipe bodies of the water pipes 32 connected to the plurality of spray heads 31 are provided with pipe valves 321. The spray layer 3 adopts the spray structure inside the traditional spray tower, that is, a mixed liquid agent 34 doped with a spray agent and the like for waste gas treatment is placed in the corresponding bottom cavity of the tower body 100 at a certain liquid level. The mixed liquid agent 34 flows upward along the tower body 100 through the water pipe 32 under the action of the circulating pump 33. The mixed liquid 34 is sprayed evenly through the multiple groups of internal spray heads 31. The mixed liquid 34 sprayed by the spray heads 31 flows through the multiple filling balls 43 filled on the filling layer 4 and then flows back to the bottom of the tower, thereby continuously circulating the mixed liquid 34 to ensure the purification and treatment effect of the exhaust gas inside the tower body 100. The setting of the corresponding pipe valve 321 on the pipe body of the water pipe 32 connected to the multiple groups of spray heads 31 can separately control the switch or flow size of the multiple groups of spray heads 31, thereby improving the flexibility and convenience during use, meeting different usage requirements, and improving applicability and practicality.

[0032] The packing layer includes a filter assembly formed by multiple groups of filter screens 41 and filter plates 42 uniformly distributed inside the tower body 100 and placed below multiple groups of spray heads 31. The filter screen 41 is arranged in a mesh bag structure with an internal hollow and placed above the filter plate 42. The filter holes 421 on the multiple groups of filter plates 42 are arranged in sequence in the tower body 100. The mesh bag structure of the filter screen 41 can finely filter the mixed liquid agent 34 flowing through the filling balls 43 above, and can remove most of the impurities contained in the mixed liquid agent 34, so as to further In order to avoid the phenomenon that the impurities contained therein are too much and thus the filter holes 421 on the filter plate 42 below are blocked, the filter screen 41 formed by the filter bag structure can be added with catalysts and other additives required for exhaust gas purification and treatment, so as to further improve the exhaust gas purification and treatment effect and meet different usage requirements. At the same time, the filter holes 421 of different sizes arranged on the filter plate 42 below the filter screen 41 can be arranged from bottom to top along the inside of the tower body 100 according to specific usage requirements, and the filter holes 421 on the corresponding filter plate 42 are distributed in sequence from large to small, such as Figure 2 or Figure 3As shown in , this arrangement can filter and purify the mixed liquid 34 and the exhaust gas in turn, so that there are certain differences in the use functions and effects between this multi-layer structure, improving the comprehensiveness and efficiency of exhaust gas purification and treatment. In addition, the mesh bag structure of the filter 41 can be set to an adaptive size according to the use requirements, and the batch filling balls 43 can be added to the inside of the filter bag, so that during the spraying process of the spray head 31, the filter 41 structure can further improve the overall distribution uniformity and stability of the batch filling balls 43, avoid the phenomenon that the filling balls 43 are locally displaced or unevenly distributed during the spraying process, and affect the exhaust gas purification and treatment effect, so as to achieve the best use effect of the filling balls 43. The filling layer 4 formed by this filter component has a better filtering effect than the conventional filling layer 4 structure, which can further extend the use effect and use time of the mixed liquid 34 inside the tower body 100, further improve the utilization rate of the mixed liquid 34 and reduce the waste of a certain amount of mixed liquid 34.

[0033] The tower body 100 further includes a second tower body 110 disposed at the front end and connected to the air inlet 101 of the tower body 100 through the main pipe 120. The second tower body 110 includes a multilayer structure formed by a spray layer 3 and a packing layer disposed thereunder. The internal structure of the second tower body 110 can be found in Figure 3 As shown in the figure, the second tower body 110 disposed at the front end can firstly perform pretreatment of the exhaust gas, and the exhaust gas after pretreatment continues to flow through the tower body 100 structure through the main pipeline 120 for secondary purification and treatment, so that it can be selectively used according to the specific exhaust gas emission and different usage requirements, thereby improving the efficiency of exhaust gas purification and treatment.

[0034] See also Figure 4, an air collecting hood 5 is arranged at the air inlet 121 at the front end of the main pipeline 120, and the air collecting hood 5 comprises an outer cover 51, a tight ring 52 and an inner cover 53, the inner cover 53 is made of elastic material, connected to the air inlet 121 and arranged in a trumpet shape, the outer cover 51 is fixed on the main pipeline 120 at the air inlet 121 outside the inner cover 53, the tight ring 52 is adapted to be arranged on the periphery of the inner cover 53 and is slidably arranged on the outer cover 51 through multiple groups of sliding rods 511 and adjusting members 512 arranged on the outer cover 51 and multiple groups of compression springs 513 arranged on the outer side thereof, the air collecting hood 5 can further improve the exhaust gas collection effect of the air inlet 121 of the main pipeline 120, and the air collecting hood 5 is During use, different absorption ranges can be adjusted according to the specific exhaust gas source, that is, the inner cover 53 made of elastic material and arranged in a trumpet shape can produce elastic deformation within a certain range. Specifically, the adjustment member 512 provided on the outer cover 51 can be rotated so that the tight hoop 52 provided on the outer periphery of the inner cover 53 can slide adaptively at the corresponding position under the action of the slide rod 511 and the compression spring 513 sleeved on its outer side, thereby changing the size of the trumpet mouth of the inner cover 53, so that the exhaust gas absorption range at the air intake port 121 can be adjusted within a certain area, and the air collecting hood 5 can be adjusted according to specific use requirements to meet different use requirements and further improve the efficiency of exhaust gas collection on the main pipeline 120.

[0035] The above contents described in this specification are merely examples of the present utility model. Those skilled in the art of the present utility model may make various modifications or additions to the specific embodiments described, or replace them in similar ways, as long as they do not deviate from the contents of the present utility model specification or exceed the scope defined in the claims, they shall all fall within the protection scope of the present utility model.

Claims

1. A waste gas treatment device for aluminum parts production, comprising a tower structure for waste gas treatment composed of a multi-layer structure of a spray layer and a filler layer disposed thereunder, characterized in that: A negative pressure component is arranged on the tower body, and the negative pressure component is arranged in two groups and distributed at the upper and lower ends of the tower body. The negative pressure component at the lower end of the tower body is installed at the air inlet arranged at the bottom of the tower body and is connected to the main pipeline at the air inlet. The negative pressure component at the upper end of the tower body is installed on the lower side of the exhaust port arranged at the top of the tower body. A guide plate is arranged inside the tower body. The guide plate is arc-shaped and is respectively installed on the wind path corresponding to the negative pressure component inside the tower body to form convection.

2. The exhaust gas treatment device for aluminum parts production according to claim 1 is characterized in that: The guide plate includes a first guide plate and a second guide plate. The first guide plate adopts an arc plate structure and is installed on one side below the top exhaust port of the tower body and is fixed at a position corresponding to the negative pressure component. The second guide plate is arranged in a "ladder-like" structure and has a plurality of guide channels opened inside.

3. The exhaust gas treatment device for aluminum production according to claim 2 is characterized in that: The guide channel is arranged in an arc shape and its arc surface is arranged from low to high in a direction away from the negative pressure component.

4. The exhaust gas treatment device for aluminum production according to claim 2 is characterized in that: A hood is rotatably arranged on the top trapezoidal surface of the second "ladder-shaped" air guide plate, and a number of turbulence plates are arranged around the bottom and side surfaces of the hood.

5. The exhaust gas treatment device for aluminum parts production according to claim 2 is characterized in that: A partition is arranged on the packing layer corresponding to the first guide plate below the tower body to form two corresponding independent cavities. The first guide plate below the exhaust port at the top of the tower body is placed above the cavity on one side. A filter element is arranged at the installation position connected to the first guide plate below the exhaust port and placed above the cavity on the other side.

6. The exhaust gas treatment device for aluminum production according to claim 1 is characterized in that: A second filter element is arranged in the exhaust duct connected to the exhaust port at the top of the tower body, and a protective net is also installed at the air outlet arranged in the main body of the negative pressure component.

7. The exhaust gas treatment device for aluminum production according to claim 1 is characterized in that: The spray layer comprises a plurality of spray heads evenly distributed in the tower body and a circulating pump connected to the tower body through water pipes and installed at the bottom of the tower body, and pipe valves are arranged on the corresponding pipe bodies of the water pipes connected to the plurality of spray heads.

8. The exhaust gas treatment device for aluminum production according to claim 7 is characterized in that: The packing layer includes a filter assembly formed by multiple groups of filter screens and filter plates evenly distributed inside the tower body and placed under multiple groups of spray heads. The filter screen adopts an internal hollow mesh bag structure and is placed above the filter plate. The filter holes on the multiple groups of filter plates are set in different sizes and arranged in sequence inside the tower body.

9. The exhaust gas treatment device for aluminum production according to claim 1 is characterized in that: The tower body also includes a second tower body which is arranged at the front end and connected to the air inlet of the tower body through the main pipeline. The second tower body includes a multi-layer structure formed by a spray layer and a packing layer arranged below.

10. The exhaust gas treatment device for aluminum production according to claim 1, characterized in that: An air collecting hood is arranged at the air intake port at the front end of the main pipeline, and the air collecting hood includes an outer cover, a tight hoop and an inner cover. The inner cover is made of elastic material, connected to the air intake port and arranged in a trumpet shape. The outer cover is fixed on the main pipeline at the air intake port outside the inner cover. The tight hoop is adapted to be arranged on the periphery of the inner cover and is slidably arranged on the outer cover through multiple groups of sliding rods and adjusting parts arranged on the outer cover and multiple groups of compression springs arranged on the outer side.

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