Electrolytic aluminum flue gas desulfurization device

Abstract

The utility model belongs to the technical field of flue gas desulfurization devices, and particularly relates to an electrolytic aluminum flue gas desulfurization device which comprises a chimney, the upper end and the lower end of the chimney are sealed, a flue gas inlet is formed in the side wall of the lower end of the chimney, and a spraying mechanism for spraying and desulfurizing flue gas in the chimney is arranged in the middle of the chimney. A first filtering mechanism for primarily filtering solid particles in flue gas and a second filtering mechanism for secondarily filtering solid particles in flue gas are sequentially arranged at the upper end of the chimney from bottom to top, the first filtering mechanism comprises a flue pipe, the flue pipe is arranged in the chimney, and the flue pipe is in sealed connection with the inner wall of the chimney through an annular plate; a fixed frame is arranged above the flue pipe, the fixed frame is fixedly connected with the chimney, and an impeller driven by a motor to rotate is arranged in the fixed frame. The flue gas spray desulfurization and the subsequent flue gas dust filtering and discharging are integrated in one chimney, so that the overall size of the device can be obviously reduced, and the device is convenient to popularize and use.

Description

Technical Field

[0001] The utility model belongs to the technical field of flue gas desulfurization devices, in particular to a flue gas desulfurization device for electrolytic aluminum. Background Art

[0002] Desulfurization of electrolytic aluminum flue gas is an essential process in the treatment of electrolytic aluminum flue gas. Electrolytic aluminum flue gas is only allowed to be discharged after desulfurization.

[0003] In the prior art, there are many methods that can be used to desulfurize the flue gas of electrolytic aluminum, such as the spray-dry flue gas desulfurization process.

[0004] Spray dry flue gas desulfurization, this process uses atomized lime slurry to contact with flue gas in a spray desulfurization tower. The lime slurry reacts with SO to generate dry solid reactants. Due to the fine spray, the volume of the generated solid reactants is also small. Finally, they enter the dust collector together with the flue gas flow and are collected by the dust collector. However, such equipment in the prior art generally has a complicated structure and a large volume. The dust collector and the spray desulfurization tower occupy more space. Therefore, an electrolytic aluminum flue gas desulfurization device is needed to improve this problem. Utility Model Content

[0005] In order to solve the above defects in the prior art, the utility model discloses an electrolytic aluminum flue gas desulfurization device, which is implemented by adopting the following technical solutions.

[0006] A flue gas desulfurization device for electrolytic aluminum comprises a chimney, wherein the upper and lower ends of the chimney are both sealed and a smoke inlet is arranged on the side wall of the lower end, a spray mechanism for spraying and desulfurizing the flue gas therein is arranged in the middle of the chimney, a first filtering mechanism for preliminarily filtering out solid particles in the flue gas and a second filtering mechanism for secondary filtering out solid particles in the flue gas are arranged in sequence from bottom to top at the upper end of the chimney, the first filtering mechanism comprises a flue pipe, the flue pipe is arranged in the chimney, the flue pipe is sealed and connected to the inner wall of the chimney through an annular plate, and the annular plate is located at the lower end of the flue pipe, a fixed frame is arranged above the flue pipe, the fixed frame is fixedly connected to the chimney, and an impeller driven to rotate by a motor is arranged in the fixed frame.

[0007] Furthermore, the spray mechanism is composed of a plurality of atomizing nozzles evenly arranged on the middle wall of the chimney, one end of the atomizing nozzle is provided with a connecting flange, and the connecting flange is fixed to the inner wall of the chimney by bolts.

[0008] Furthermore, the second filtering mechanism includes an annular fixed bin, which is arranged around the upper end of the chimney, and a plurality of air outlet gaps are evenly arranged in the circumferential direction of the upper part of the chimney, the air outlet gaps are connected to the annular fixed bin, and a partition is arranged in the annular fixed bin to divide it into upper and lower parts of the space, and a smoke exhaust pipe is arranged at the upper end of the chimney, and the smoke exhaust pipe and the chimney are sealed and connected, and a plurality of air inlet gaps are evenly arranged on the circumferential surface of the smoke exhaust pipe, the air inlet gaps are located above the partition and are connected with the upper space of the annular fixed bin, and a plurality of through grooves are arranged on the partition and on the bottom of the annular fixed bin, and the through grooves on the partition correspond to the through grooves at the bottom of the annular fixed bin one by one, and a mesh cylinder is installed between the through grooves at the bottom of the annular fixed bin and the corresponding through grooves on the partition, a filter element is installed in the mesh cylinder, and a sealing cover is threadedly installed in the through groove at the bottom of the annular fixed bin.

[0009] Furthermore, the impeller is installed on a rotating shaft, the rotating shaft is rotatably connected to a fixed frame, the motor is installed on the top of the fixed frame, and the output shaft of the motor is transmission-connected to the rotating shaft through a coupling.

[0010] Furthermore, an inspection port is provided on the wall surface of the chimney, and the inspection port is located above the annular plate.

[0011] Furthermore, an exhaust pipe is arranged on the circumferential surface of the lower end of the chimney.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] 1. The utility model has good use effect, and integrates the flue gas spray desulfurization and the subsequent flue gas dust filtration and discharge inside a chimney, which can significantly reduce the overall volume of the device, thereby facilitating popularization and use.

[0014] 2. The utility model is provided with two sets of filtering mechanisms for filtering dust particles in the flue gas, including sulfide solid particles produced during desulfurization. The two filtering methods complement each other and can greatly improve the effect of filtering the flue gas of the device, thereby improving the treatment effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a cross-sectional view of the spray mechanism structure in the utility model;

[0017] Figure 3 It is a distribution cross-sectional view of the first filter mechanism and the second filter mechanism in the utility model;

[0018] Figure 4It is a schematic diagram of the second filtering mechanism in the utility model;

[0019] The reference numerals in the figure are as follows: chimney 1; smoke inlet 2; atomizing nozzle 3; connecting flange 4; annular plate 5; flue pipe 6; fixed frame 7; impeller 8; smoke exhaust pipe 9; annular fixed bin 10; air outlet gap 11; air inlet gap 12; partition 13; through groove 14; mesh tube 15; sealing cover 16; motor 17; inspection port 18; discharge pipe 19. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below through embodiments and in combination with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0021] The serial numbers of the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections. In the description of the present utility model, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, 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 therefore cannot be understood as a limitation to the present utility model.

[0022] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0023] like Figure 1-4As shown, a flue gas desulfurization device for electrolytic aluminum comprises a chimney 1, wherein the upper and lower ends of the chimney 1 are sealed and a smoke inlet 2 is arranged on the side wall of the lower end, an exhaust pipe 19 is arranged on the circumferential surface of the lower end of the chimney 1, a spray mechanism for spraying and desulfurizing the flue gas therein is arranged in the middle of the chimney 1, and the spray mechanism is composed of a plurality of atomizing nozzles 3 evenly arranged on the wall surface of the middle part of the chimney 1, a connecting flange 4 is arranged at one end of the atomizing nozzle 3, and the connecting flange 4 is fixed to the inner wall of the chimney 1 by bolts; the upper end of the chimney 1 is sequentially provided with nozzles for preliminarily filtering out solid particles in the flue gas from bottom to top. The first filtering mechanism and the second filtering mechanism for secondary filtering of solid particles in the flue gas, the first filtering mechanism includes a flue pipe 6, the flue pipe 6 is arranged in the chimney 1, the flue pipe 6 is sealed and connected to the inner wall of the chimney 1 through an annular plate 5, and the annular plate 5 is located at the lower end of the flue pipe 6, a fixed frame 7 is arranged above the flue pipe 6, the fixed frame 7 is fixedly connected to the chimney 1, the impeller 8 is installed on the rotating shaft, the rotating shaft is rotatably connected to the fixed frame 7, the motor 17 is installed on the top of the fixed frame 7, and the output shaft of the motor 17 is connected to the rotating shaft through a coupling. The chimney 1 is dynamically connected, and an inspection port 18 is arranged on the wall of the chimney 1, and the inspection port 18 is located above the annular plate 5; the second filtering mechanism includes an annular fixed warehouse 10, and the annular fixed warehouse 10 is arranged around the upper end of the chimney 1, and a plurality of air outlet gaps 11 are evenly opened in the circumferential direction of the upper part of the chimney 1, and the air outlet gaps 11 are connected to the annular fixed warehouse 10, and a partition 13 is arranged in the annular fixed warehouse 10 to divide it into two parts of the space, an upper and lower part, and an exhaust pipe 9 is arranged at the upper end of the chimney 1, and the exhaust pipe 9 is sealed and connected to the chimney 1, and the exhaust pipe 9 is sealed and connected to the chimney 1. A plurality of air inlet notches 12 are evenly provided on the circumferential surface, the air inlet notches 12 are located above the partition 13 and are communicated with the upper space of the annular fixed bin 10, a plurality of through grooves 14 are provided on the partition 13 and at the bottom of the annular fixed bin 10, the through grooves 14 on the partition 13 correspond one to one with the through grooves 14 at the bottom of the annular fixed bin 10, a mesh cylinder 15 is installed between the through grooves 14 at the bottom of the annular fixed bin 10 and the corresponding through grooves 14 on the partition 13, a filter element is installed in the mesh cylinder 15, and a sealing cover 16 is threadedly installed in the through groove 14 at the bottom of the annular fixed bin 10.

[0024] The working principle of the utility model is as follows:

[0025] When the device is used, the flue gas to be treated and desulfurized can be injected into the chimney 1 through the smoke inlet 2, and then the agent is sprayed out through the atomizing nozzle 3 for spray desulfurization. During the spray desulfurization, the agent (lime slurry) sprayed from the atomizing nozzle 3 reacts with SO to generate dry solid reactants. Due to the fine spray, the volume of the generated solid reactants is also small. A part of the solid reactants falls to the bottom of the chimney 1 and is discharged from the exhaust pipe 19, and the other part goes up together with the flue gas and enters the flue pipe 6 to contact the impeller 8; then the impeller 8 rotates at a high speed to drive the flue gas to flow quickly, and at the same time, the impeller 8 relies on centrifugal force to throw the flue gas out, so that the solid particles in the flue gas will be thrown onto the inner wall of the chimney 1 under the action of centrifugal force, thereby separating from the flue gas and falling onto the annular plate 5; in this way, the primary dust removal treatment of the flue gas can be completed, and the solid reactants dropped on the annular plate 5 can be taken out through the inspection port 18;

[0026] The smoke after one filtration can enter the annular fixed bin 10 through the air outlet gap 11, then pass through the mesh tube 15 and the filter element, enter the upper end of the partition 13, and then pass through the air inlet gap 12, so that the smoke filtered by the filter element enters the smoke exhaust pipe 9 and is discharged; in this way, the second filtering mechanism can be used to further filter the smoke in a systematic manner to improve the filtering effect of the smoke.

Claims

1. An aluminum electrolytic flue gas desulfurization device, comprising a chimney (1), characterized in that: The upper and lower ends of the chimney (1) are sealed and a smoke inlet (2) is provided on the side wall of the lower end. A spray mechanism for spraying and desulfurizing the smoke therein is provided in the middle of the chimney (1). A first filtering mechanism for preliminarily filtering out solid particles in the smoke and a second filtering mechanism for secondary filtering out solid particles in the smoke are provided at the upper end of the chimney (1) in sequence from bottom to top. The first filtering mechanism comprises a flue pipe (6). The flue pipe (6) is provided in the chimney (1). The flue pipe (6) is sealedly connected to the inner wall of the chimney (1) via an annular plate (5). The annular plate (5) is located at the lower end of the flue pipe (6). A fixed frame (7) is provided above the flue pipe (6). The fixed frame (7) is fixedly connected to the chimney (1). An impeller (8) driven to rotate by a motor (17) is provided in the fixed frame (7).

2. The aluminum electrolytic flue gas desulfurization device according to claim 1, characterized in that: The spray mechanism is composed of a plurality of atomizing nozzles (3) evenly arranged on the middle wall surface of the chimney (1); a connecting flange (4) is arranged at one end of the atomizing nozzle (3); and the connecting flange (4) is fixed to the inner wall of the chimney (1) by bolts.

3. The aluminum electrolytic flue gas desulfurization device according to claim 1, characterized in that: The second filtering mechanism comprises an annular fixed bin (10), the annular fixed bin (10) being arranged around the upper end of the chimney (1), a plurality of air outlet notches (11) being uniformly provided in the circumferential direction of the upper part of the chimney (1), the air outlet notches (11) being connected to the annular fixed bin (10), a partition (13) being provided in the annular fixed bin (10) for dividing the annular fixed bin (10) into two spaces, an upper part and an lower part, a smoke exhaust pipe (9) being arranged at the upper end of the chimney (1), the smoke exhaust pipe (9) being sealedly connected to the chimney (1), a plurality of air inlet notches (12) being uniformly provided on the circumferential surface of the smoke exhaust pipe (9), the air inlet notches (11) being connected to the upper end of the chimney (1), and the air inlet notches (12) being uniformly provided on the circumferential surface of the smoke exhaust pipe (9). 12) is located above the partition (13) and is connected to the upper space of the annular fixed bin (10). A plurality of through grooves (14) are provided on the partition (13) and at the bottom of the annular fixed bin (10). The through grooves (14) on the partition (13) correspond to the through grooves (14) at the bottom of the annular fixed bin (10) one by one. A mesh cylinder (15) is installed between the through grooves (14) at the bottom of the annular fixed bin (10) and the corresponding through grooves (14) on the partition (13). A filter element is installed in the mesh cylinder (15). A sealing cover (16) is installed in the through groove (14) at the bottom of the annular fixed bin (10) through a thread.

4. The aluminum electrolytic flue gas desulfurization device according to claim 1, characterized in that: The impeller (8) is mounted on a rotating shaft, the rotating shaft is rotationally connected to a fixed frame (7), the motor (17) is mounted on the top of the fixed frame (7), and the output shaft of the motor (17) is transmission-connected to the rotating shaft via a coupling.

5. The aluminum electrolytic flue gas desulfurization device according to claim 1, characterized in that: An inspection opening (18) is provided on the wall surface of the chimney (1), and the inspection opening (18) is located above the annular plate (5).

6. An aluminum electrolytic flue gas desulfurization device according to claim 1, characterized in that: An exhaust pipe (19) is arranged on the circumferential surface of the lower end of the chimney (1).

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