Annular chute assembly and aluminum electrolysis dry purification system

Abstract

The utility model discloses an annular chute assembly, which relates to the technical field of aluminum electrolysis dry purification, and mainly comprises an annular chute main body and a ventilation layer, the annular chute main body is used for being arranged inside a reactor, the annular chute main body is provided with discharge holes, the discharge holes are arranged along the circumferential direction of the annular chute main body, and the discharge holes are used for discharging materials. The ventilation layer is arranged in the annular chute main body and can divide the space of the annular chute main body into a first space and a second space, the first space is provided with a feeding hole, the feeding hole is used for allowing materials to enter, the first space is used for allowing the materials to pass through, the second space is used for allowing gas to pass through, and the first space is located above the second space. The aluminum electrolysis dry purification system provided by the utility model comprises the annular chute assembly. Aluminum oxide materials pass through the first space and then are discharged into the reactor through the annularly arranged discharge holes, so that the aluminum oxide is more dispersed when being put into the reactor, the reactor is prevented from being blocked, and the purification effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum electrolysis dry purification, in particular to an annular chute component and an aluminum electrolysis dry purification system. Background Art

[0002] Aluminum electrolysis purification system mainly adopts two methods: wet purification and dry purification. After years of development and application, dry purification has gradually replaced wet purification process with advantages such as simple control and clear process to become the main aluminum electrolysis flue gas purification process. Dry purification is to use sand-like alumina as adsorbent to remove pollutants such as HF in aluminum electrolysis flue gas through physical adsorption and chemical adsorption, and at the same time generate fluorine-containing alumina to return to the electrolytic cell for production and use, so as to realize the recovery and reuse of pollutants such as fluoride in aluminum electrolysis flue gas, and at the same time reduce the consumption of fluoride salt in aluminum electrolysis production. The process flow of the aluminum electrolysis dry purification system is as follows: the flue gas generated by electrolysis is powered by the induced draft fan, and is gathered to the main flue pipe through the electrolytic cell gas collection hood and branch flue pipes. The flue gas enters the vertical reactor from the main flue pipe, and is mixed with the alumina input from the alumina circulation system to undergo an adsorption reaction, converting the HF gas into solid fluorine-carrying alumina. The flue gas after the reaction is separated from the fluorine-carrying alumina through gas-solid separation in the dust collector, and then transported to each electrolytic cell material box for production use through the super-dense phase system. The clean gas after the reaction is desulfurized by the subsequent desulfurization system and then discharged into the atmosphere through the chimney.

[0003] However, in the existing device, alumina enters the reactor directly through a chute and then reacts with the flue gas. Since the reactor has been used for a long time, field operation observations have shown that the alumina added to the reactor is not more dispersed, resulting in reactor blockage, which affects the purification efficiency of the purification system and the normal operation of the purification system, and cannot meet the increasingly severe environmental protection situation.

[0004] Patent CN220034695U discloses a decentralized electrolytic flue gas purification system, which also uses a straight chute to allow alumina to enter the reactor for reaction. The system also has the problem of the alumina being added to the reactor not being more dispersed, resulting in reactor blockage.

[0005] Therefore, it is urgent to provide an annular chute assembly and an aluminum electrolysis dry purification system to solve the above-mentioned problems existing in the prior art. Utility Model Content

[0006] The utility model aims to provide an annular chute assembly and an aluminum electrolysis dry purification system to solve the problems existing in the above-mentioned prior art, so that the aluminum oxide is put into the reactor more dispersedly, avoids clogging the reactor, and improves the purification effect.

[0007] To achieve the above purpose, the utility model provides the following solutions:

[0008] The utility model provides an annular chute assembly, comprising

[0009] an annular chute body, the annular chute body is used to be arranged inside the reactor, the annular chute body is provided with discharge holes, the discharge holes are arranged along the circumference of the annular chute body, and the discharge holes are used to discharge materials; and

[0010] A ventilation layer is arranged inside the annular chute body, and can divide the space of the annular chute body into a first space and a second space, and the first space is located above the second space; wherein, a feed hole is arranged on the first space, and the feed hole is used for material to enter, and the first space is connected with the discharge hole, and an air inlet is arranged on the second space for air intake, and the ventilation layer can allow the air in the second space to pass into the first space to promote the movement of the material.

[0011] Preferably, the annular chute body includes a top cover, a trough body and a trough bottom, the top cover is located above the trough body and fixedly connected to the trough body, the trough bottom is located below the trough body and fixedly connected to the trough body, and the discharge hole is opened on the top cover.

[0012] Preferably, the top cover and the groove bottom are both conical structures.

[0013] Preferably, it also includes a pneumatic chute, one end of which is connected to the annular chute body, and the other end is connected to the electrolytic cell. A ventilation layer is provided inside the pneumatic chute, and the pneumatic chute is divided into a material chamber and an air chamber by the ventilation layer. The material chamber is connected to the first space, and the air chamber is connected to the second space. The material chamber is used to provide a channel for the material, and the air chamber is used to fill with high-pressure gas. The pneumatic chute is used to fluidize the material.

[0014] Preferably, it further comprises a flange, and the annular chute body is connected to the pneumatic chute via the flange.

[0015] Preferably, the ventilation layer is a sintered mesh.

[0016] Preferably, the annular chute body and the pneumatic chute are both made of manganese steel.

[0017] The utility model also provides an aluminum electrolysis dry purification system, comprising the annular chute assembly as described above.

[0018] Compared with the prior art, the utility model has achieved the following technical effects:

[0019] The annular chute body of the utility model is used to be arranged inside the reactor, and is provided with discharge holes, which are arranged circumferentially along the annular chute body, and are used for discharging materials. A ventilation layer is arranged inside the annular chute body, and can divide the space of the annular chute body into a first space and a second space, and the first space is located above the second space; wherein, a feed hole is provided on the first space, and the feed hole is used for material to enter, and the first space is connected with the discharge hole, and an air inlet is provided on the second space for air intake, and the ventilation layer can allow the air intake in the second space to pass into the first space to promote the movement of the material, and the aluminum oxide material passes through the first space and then is discharged into the reactor through the annularly arranged discharge holes, so that the aluminum oxide input into the reactor is more dispersed, the reactor is avoided from being blocked, and the purification effect is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a schematic structural diagram of an annular chute assembly in an embodiment of the utility model;

[0022] Figure 2 It is a schematic diagram of an aluminum electrolysis dry purification system in an embodiment of the utility model.

[0023] In the figure: 1-discharge hole; 2-ventilation layer; 3-top cover; 4-trough body; 5-trough bottom; 6-first space; 7-second space; 8-material chamber; 9-air chamber; 10-pneumatic chute; 11-flange. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiment is only a spatial embodiment of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] The utility model aims to provide an annular chute assembly and an aluminum electrolysis dry purification system to solve the problems existing in the above-mentioned prior art, so that the aluminum oxide is put into the reactor more dispersedly, avoids clogging the reactor, and improves the purification effect.

[0026] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] Embodiment 1:

[0028] like Figure 1-Figure 2 As shown, the utility model provides an annular chute assembly, including an annular chute body and a ventilation layer 2, the annular chute body is arranged inside the reactor of the aluminum electrolysis dry purification system, a discharge hole 1 is arranged on the top of the annular chute body, the discharge hole 1 is arranged along the circumference of the annular chute body, the discharge hole 1 is used for material discharge, the ventilation layer 2 is arranged inside the annular chute body, and the space of the annular chute body can be divided into a first space 6 and a second space 7, the first space 6 is located above the second space 7; wherein, a feed hole is arranged on the first space 6, the feed hole is used for material entry, and the first space 6 is connected with the discharge hole 1, and an air inlet is arranged on the second space 7 for air intake, the ventilation layer 2 can make the air intake in the second space 7 pass into the first space 6 to promote the movement of the material, and the aluminum oxide material passes through the first space 6 and then is discharged into the reactor through the annularly arranged discharge hole 1, so that the aluminum oxide is put into the reactor more dispersed, avoids clogging the reactor, improves the purification effect, and at the same time does not make the aluminum oxide enter the reactor in piles, causing wear to the reactor.

[0029] It should be noted that the annular chute body and the reactor are preferably concentrically arranged, which can ensure the uniform input of the alumina material to a greater extent. They can also be eccentrically arranged, as long as the annular chute body can be located inside the reactor. The gas passing through the second space 7 is pressurized high-pressure gas, which needs to be able to blow the alumina material from the ventilation layer and discharge it through the discharge hole, wherein the discharge hole is preferably arranged in multiple circumferential directions to ensure the multi-directional discharge of alumina, or it can be set as a discharge hole arranged circumferentially, as long as the dispersed discharge of the alumina material can be ensured.

[0030] In this embodiment, the annular chute body includes a top cover 3, an annular trough body 4 and a trough bottom 5. The top cover 3 is located above the trough body 4 and is fixedly connected to the trough body 4. The trough bottom 5 is located below the trough body 4 and is fixedly connected to the trough body 4. A discharge hole 1 is opened on the top cover 3. The discharge hole 1 is arranged in multiple circumferential directions to ensure that the material can be discharged smoothly through the discharge hole 1. The top cover 3 and the trough bottom 5 are both conical structures, which can reduce the vortex near the annular chute, reduce the resistance of the purification system, and increase the flue gas flow rate. After the original multi-stage rotating reactor is replaced with an annular chute, the overall resistance of the reactor can be significantly reduced by 90-110Pa.

[0031] In the present embodiment, the annular chute assembly further includes a pneumatic chute 10, one end of which is connected to the annular chute body, and the other end is connected to the electrolytic cell. A ventilation layer 2 is also provided inside the pneumatic chute 10, and the pneumatic chute 10 is divided into a material chamber 8 and an air chamber 9 by the ventilation layer 2. The material chamber 8 is connected to the first space 6, and the air chamber 9 is connected to the second space 7. After passing through the material chamber, the alumina material directly enters the first space 6, and the flow is smooth. The material chamber 8 is used to provide a channel for the material, and the air chamber 9 is used to fill with high-pressure gas. The pneumatic chute 10 is used to fluidize the material. After the fluidization treatment, the alumina material is in a fluidized state close to that of a liquid, and can smoothly flow into the annular chute body, and then be blown out of the discharge hole by the high-pressure gas.

[0032] It should be noted that the pneumatic chute 10 adopts a straight bar setting in a straight line, and the end close to the annular chute body is lower than the end close to the electrolytic cell, which can facilitate the circulation of alumina materials. In order to facilitate the connection between the electrolytic cell and the annular chute body, other shapes of chutes can also be used, such as L-shaped chutes, S-shaped chutes or other types of chutes, but it is also necessary to ensure that the end close to the annular chute body is lower than the end close to the electrolytic cell, so as to ensure that the connection between the electrolytic cell and the annular chute body can be achieved and the fluid state of the alumina material can be guaranteed.

[0033] In this embodiment, the annular chute assembly also includes a flange 11, and the annular chute assembly is connected to the pneumatic chute through the flange 11. The flange 11 includes a first flange and a second flange. The first flange is used to connect to the pneumatic chute 10, and the second flange is used to connect to the annular chute body. The first flange is arranged on the side of the annular chute body, and the first flange is used to connect to the second flange on the pneumatic chute.

[0034] In this embodiment, the ventilation layer 2 is a sintered mesh, which has good wear resistance and can increase the service life. It should be noted that the ventilation layer 2 can also adopt other settings, such as ventilation plates, ventilation meshes, etc., as long as good ventilation can be achieved.

[0035] In this embodiment, the annular chute body and the pneumatic chute 10 are both made of manganese steel, which has good wear resistance and impact resistance and can increase the service life. It should be noted that ordinary steel, carbon steel or other types of steel can also be used.

[0036] Embodiment 2:

[0037] In this embodiment, an aluminum electrolysis dry purification system is also provided, including the above annular chute assembly.

[0038] Specifically, the flow process of alumina and flue gas in the aluminum electrolysis dry purification system is as follows:

[0039] Flue gas flow process: The flue gas passes through the electrolytic cell, the annular chute assembly in the reactor, the bag filter, the main exhaust fan, the chimney and then discharged into the atmosphere.

[0040] Alumina circulation process: Alumina enters the annular chute assembly in the reactor from the electrolytic cell and then enters the bag filter. After entering the bag filter, it is divided into the first part and the second part. The first part enters the circulating alumina chute, and is blown by the high-pressure centrifugal fan and enters the reactor again for a circulation reaction. The second part enters the return alumina chute, and is also blown by the high-pressure centrifugal fan, and then enters the bucket elevator and pneumatic hoist. The alumina in the pneumatic hoist is further blown to the fluorine-containing alumina silo by the Roots blower. The alumina in the bucket elevator directly enters the fluorine-containing alumina silo, and then the alumina in the fluorine-containing alumina silo enters the super-dense phase conveying system. Under the action of the centrifugal fan, it comes out of the super-dense phase conveying system and enters the electrolytic cell for another circulation reaction.

[0041] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An annular chute assembly, characterized in that: include An annular chute body, the annular chute body is used to be arranged inside the reactor, the annular chute body is provided with discharge holes, the discharge holes are arranged along the circumference of the annular chute body, and the discharge holes are used to discharge materials; and A ventilation layer is arranged inside the annular chute body, and can divide the space of the annular chute body into a first space and a second space, and the first space is located above the second space; wherein, a feed hole is arranged on the first space, and the feed hole is used for material to enter, and the first space is connected with the discharge hole, and an air inlet is arranged on the second space for air intake, and the ventilation layer can allow the air in the second space to pass into the first space to promote the movement of the material.

2. The annular chute assembly according to claim 1, characterized in that: The annular chute body includes a top cover, a trough body and a trough bottom. The top cover is located above the trough body and fixedly connected to the trough body. The trough bottom is located below the trough body and fixedly connected to the trough body. The discharge hole is opened on the top cover.

3. The annular chute assembly according to claim 2, characterized in that: The top cover and the groove bottom are both conical structures.

4. The annular chute assembly according to claim 1, characterized in that: It also includes a pneumatic chute, one end of which is connected to the annular chute body, and the other end is connected to the electrolytic cell. A ventilation layer is arranged inside the pneumatic chute, and the ventilation layer divides the pneumatic chute into a material chamber and an air chamber, wherein the material chamber is connected to the first space, and the air chamber is connected to the second space. The material chamber is used to provide a channel for the material, and the air chamber is used to fill with high-pressure gas to fluidize the material in the pneumatic chute.

5. The annular chute assembly according to claim 4, characterized in that: It also includes a flange, and the annular chute body is connected to the pneumatic chute through the flange.

6. The annular chute assembly according to claim 1, characterized in that: The ventilation layer is a sintered mesh.

7. The annular chute assembly according to claim 4, characterized in that: The annular chute body and the pneumatic chute are both made of manganese steel.

8. An aluminum electrolysis dry purification system, characterized in that: Comprising an annular chute assembly as described in any one of claims 1-7.

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