Alumina feed control apparatus

Abstract

The utility model discloses an alumina feed control equipment is set up in the feed port of aluminium electrolytic cell, and its characterized in that includes: the tubular material channel, and the first side plate is set up to give place to the cavity, and the throttle baffle is slidably assembled in the first side plate, and through the give place to the cavity and can reciprocatingly enter the material channel inner chamber, the throttle baffle middle part is equipped with the through -hole of axial, and its through -flow cross -section area is less than the material channel nominal through -flow cross -section area, the motor is fixed in the material channel outer wall, and the output end and the throttle baffle constitute the motion transmission chain, wherein when the motor drive throttle baffle enters the working position, its board body hides the material channel flow cross section, and the material passes through the through -hole and is limited to flow. The utility model discloses a tubular material channel, throttle baffle with through -hole, motor and its motion transmission chain are set up, utilize motor drive throttle baffle and enter the working position quickly, make its board body hide the material channel flow cross section, and the material can only pass through the through -hole and is limited to flow, realized the instant, accurate regulation of alumina feed flow.

Description

Technical Field

[0001] This utility model relates to the field of aluminum electrolysis technology, and in particular to an alumina feeding control device. Background Technology

[0002] The electrolytic aluminum production process employs the cryolite-alumina molten salt electrolysis method, using molten cryolite as the solvent and alumina as the solute. A direct current is passed between the carbon anode and the molten aluminum cathode, and the electrochemical reaction takes place at a high temperature of 950℃-970℃. During this process, the alumina concentration is a crucial parameter for maintaining the material balance and efficient operation of the electrolytic cell. Fluctuations in alumina concentration directly trigger a chain reaction of problems, including an increased probability of anodic effects, decreased current efficiency, and cell voltage instability.

[0003] Current alumina concentration control mainly relies on two technologies: speed regulation of the feeding device and throttling of the discharge equipment, such as variable frequency screw feeders or pneumatic flap valves. These technologies have inherent response delays: the time from the issuance of the concentration detection signal to the completion of the actuator action exceeds 30 seconds, causing the actual feeding to lag behind the process requirements. At the same time, single-stage throttling structures are prone to flow overshoot during adjustment, with instantaneous alumina feeding fluctuations reaching over 15%, exacerbating tank condition fluctuations.

[0004] Therefore, it is necessary to develop an alumina feed control device with fast response and precise flow rate classification to solve the concentration runaway problem caused by the delay defect and ensure the efficient and stable operation of the electrolytic cell. Utility Model Content

[0005] In view of the above situation and to overcome the defects of the prior art, this utility model provides an alumina feeding control device that is set at the alumina inlet and can quickly respond and accurately regulate the flow rate in stages.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model provides an alumina feeding control device, installed at the feed inlet of an aluminum electrolysis cell, comprising:

[0008] The cylindrical material channel has a clearance cavity in its first side plate;

[0009] A throttling baffle is slidably mounted on the first side plate and can reciprocate into and out of the inner cavity of the material channel through the clearance cavity; the throttling baffle has an axial through hole in the middle, and its flow cross-sectional area is smaller than the nominal flow cross-sectional area of ​​the material channel.

[0010] The motor is fixed to the outer wall of the material channel, and its output end and the throttling baffle form a motion transmission chain;

[0011] When the motor drives the throttling baffle to enter the working position, its plate body blocks the flow section of the material channel, and the material passes through the through hole with limited flow.

[0012] Furthermore, the motor output shaft is fixedly connected to a gear;

[0013] The throttling baffle is provided with an inclined platform near the motor, and a rack that meshes with the gear is machined on the inclined surface of the inclined platform;

[0014] in,

[0015] The gear and the rack form a meshing pair, which can convert the rotational motion of the motor into the linear displacement of the throttling baffle.

[0016] Furthermore, the normal vector of the inclined plane of the ramp is biased towards the downstream direction of the cylindrical material channel;

[0017] The angle between the inclined plane and the axis of the cylindrical material channel is θ, and θ satisfies 30°≤θ≤60°.

[0018] Furthermore, the cylindrical material channel also includes a second side plate and a third side plate connected to both sides of the first side plate and extending in the same direction as the first side plate;

[0019] The second side plate has a left-side groove with the same height as the clearance cavity of the first side plate on the side facing the inside of the cylindrical material channel.

[0020] The third side plate has a right-side groove with the same height as the clearance cavity of the first side plate on the side facing the inside of the cylindrical material channel.

[0021] in,

[0022] The two sides of the throttling baffle form a double-sided constraint sliding pair with the left side slide groove and the right side slide groove respectively, and the throttling baffle can be translated along the extension direction of the slide groove.

[0023] Furthermore, the cylindrical material channel also includes a fourth side plate disposed on the opposite side of the first side plate, and the side of the fourth side plate facing the interior of the cylindrical material channel is provided with a support slot at the same height as the clearance cavity of the first side plate.

[0024] in,

[0025] Once the throttling baffle is fully inside the cylindrical material channel, the end of the throttling baffle facing the fourth side plate can be inserted into the support slot.

[0026] Furthermore, the device includes multiple throttling baffles, and the through holes on the multiple throttling baffles have different areas for material to pass through;

[0027] The plurality of throttling baffles are arranged in descending order of the area of ​​their through holes that allows material to pass through, along the axial direction of the cylindrical material channel.

[0028] Furthermore, along the material flow direction in the cylindrical material channel, the flow cross-sectional area A_{1} of the through hole of the first-stage throttling baffle and the material flow cross-sectional area A_{0} of the cylindrical material channel (1) satisfy: A_{1}=0.8*A_{0};

[0029] The flow cross-sectional area A_{n} of the subsequent nth stage throttling baffle satisfies the recursive relationship with the flow cross-sectional area A_{n-1} of the preceding stage throttling baffle: A_{n}=0.8* A_{n-1}, where n≥2.

[0030] Furthermore, it includes at least four throttling baffles.

[0031] This utility model has at least the following advantages or beneficial effects:

[0032] This invention utilizes a cylindrical feed channel, a throttling baffle with through-holes, a motor, and its motion transmission chain. The motor drives the throttling baffle to quickly enter the working position, causing it to block the flow section of the feed channel. Material can only pass through the through-holes, achieving real-time and precise adjustment of the alumina feed flow rate. This structure has a fast response speed, shortening the time from the issuance of the control signal to the completion of the flow adjustment, effectively overcoming the deficiency of existing technologies with a response delay exceeding 30 seconds. This ensures timely material feeding to match process requirements and stabilizes the alumina concentration in the electrolytic cell.

[0033] Furthermore, by fixing a gear to the motor output shaft and setting a rack-equipped inclined platform on the motor side of the throttling baffle, the gear and rack form a meshing pair, efficiently and reliably converting the motor's rotational motion into precise linear displacement of the throttling baffle. By setting a fourth side plate with a support slot on the opposite side of the first side plate, the end of the throttling baffle can be inserted into the support slot after it is fully inside the material channel, significantly enhancing the baffle's support rigidity and resistance to material impact during operation, preventing deformation. By setting multiple throttling baffles with different through-hole flow areas, arranged sequentially along the material channel axis from largest to smallest through-hole area, multi-stage fine flow control is achieved. This step-by-step throttling effectively avoids the flow overshoot problem easily caused by single-stage adjustment. Specifically, by limiting the flow cross-sectional area of ​​the first-stage baffle A_{1} = 0.8 * A_{0}, and the flow cross-sectional area of ​​the subsequent nth-stage baffle A_{n} = 0.8 * A_{0}, the throttling cross-sectional area of ​​the first-stage baffle is limited to A_{n} = 0.8 * A_{0}. A_{n-1}, (where n≥2), forms a progressively decreasing rate of 80%, providing a scientifically reasonable flow rate gradient to ensure smooth flow regulation and high control precision. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the alumina feeding control device of this utility model;

[0036] Figure 2 This is a schematic diagram of a cylindrical material channel structure;

[0037] Figure 3 for Figure 1 Front view at point A in the middle;

[0038] Figure 4 This is a schematic diagram of the alumina feeding control device of this utility model, showing multiple throttling baffles entering the cylindrical material channel.

[0039] Figure label:

[0040] 1-Cylindrical feed channel; 11-First side plate; 111-Relief cavity; 12-Second side plate; 121-Left side chute; 13-Third side plate; 131-Right side chute; 14-Fourth side plate; 141-Support slot;

[0041] 2-Throttle baffle; 21-Through hole; 22-Sloping platform; 23-Rack;

[0042] 3-Motor; 31-Gear. Detailed Implementation

[0043] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0044] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0045] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0046] In this utility model, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of the structural relationship between the various parts or elements of this utility model and do not specifically refer to any part or element in this utility model. They should not be construed as limitations on this utility model.

[0047] In this utility model, terms such as "fixed", "connected", and "linked" should be interpreted broadly, indicating that it can be a fixed connection, an integral connection, or a detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. For relevant scientific researchers or technicians in this field, the specific meaning of the above terms in this utility model can be determined according to the specific circumstances, and should not be construed as a limitation of this utility model.

[0048] The embodiments of this utility model will be described in detail below.

[0049] This utility model discloses an alumina feeding control device.

[0050] In this embodiment, through the sliding engagement of the clearance cavity 111 of the cylindrical material channel 1 and the throttling baffle 2 with through hole 21, when the motor 3 drives the throttling baffle 2 into the working position, the throttling baffle 2 blocks the flow section of the cylindrical material channel 1, and the material can only flow through the through hole 21 on the throttling baffle 2. This structure achieves precise control of material flow rate in a short time. The direct drive mode of the motor 3 to the throttling baffle 2 compresses the throttling response time to within 5 seconds, which solves the problem of material feeding lag to a certain extent. The specific details are as follows:

[0051] Figure 1 This is a schematic diagram of the alumina feeding control device in this embodiment. As shown in the diagram, the alumina feeding control device mainly includes a cylindrical feed channel 1, a throttling baffle 2, and a motor 3. The upper end of the cylindrical feed channel 1 is connected to an alumina raw material supply device (not shown in the diagram); the lower end is connected to the feed inlet of the alumina electrolytic cell (not shown in the diagram). Four clearance cavities 111 are spaced apart along the axial direction of the first side plate 11 of the cylindrical feed channel 1. The clearance cavities 111 allow the throttling baffle 2 to enter or exit the interior of the cylindrical feed channel 1.

[0052] There are four throttling baffles 2, each slidably installed within one of the four clearance cavities 111. Each throttling baffle 2 has a through hole 21. Therefore, when a throttling baffle 2 enters the cylindrical material channel 1, the baffle blocks the flow section of the cylindrical material channel 1, and the material can only flow through the through hole 21 on the throttling baffle 2. The cross-sectional area of ​​the through hole 21 on each throttling baffle 2 that allows material to pass through is different, and it is along the material flow direction in the cylindrical material channel 1 (in this embodiment, this direction is...). Figure 1 The materials are arranged in descending order of size (from top to bottom). In this embodiment, the materials are arranged along the material flow direction within the cylindrical material channel 1 (in this embodiment, this direction is...). Figure 1 (From top to bottom) The flow cross-sectional area A_{1} of the through hole 21 of the first-stage throttling baffle 2 and the material flow cross-sectional area A_{0} of the cylindrical material channel 1 satisfy: A_{1}=0.8*A_{0}; The flow cross-sectional area A_{n} of the subsequent nth-stage throttling baffle 2 and the flow cross-sectional area A_{n-1} of the previous-stage throttling baffle 2 satisfy the recursive relationship: A_{n}=0.8*A_{n-1}, where n≥2.

[0053] All throttling baffles 2 are driven by motors 3. Motors 3 are mounted on the cylindrical feed channel 1. In this embodiment, motors 3 are located outside the first side plate 11 and below the corresponding throttling baffle 2. A rack 23 is provided on the side of the throttling baffle 2 closest to the motor 3. The rack 23 meshes with a gear fixedly mounted on the output shaft of the motor 3, forming a gear pair, thereby achieving a transmission connection between the motor 3 and the throttling baffle 2.

[0054] Figure 2 This is a schematic diagram of the cylindrical material channel 1. As shown in the diagram, a second side plate 12 and a third side plate 13 are provided on both sides of the first side plate 11. On the side of the second side plate 12 facing the interior of the cylindrical material channel 1, multiple left-side sliding grooves 121 are provided, with the height of the multiple left-side sliding grooves 121 being the same as that of the multiple clearance cavities 111. On the side of the third side plate 13 facing the interior of the cylindrical material channel 1, multiple right-side sliding grooves 131 are provided, with the height of the multiple right-side sliding grooves 131 being the same as that of the multiple clearance cavities 111. The right-side sliding grooves 131 are slidably connected to the right side wall of the throttling baffle 2, forming a sliding pair; the left-side sliding grooves 121 are slidably connected to the left side wall of the throttling baffle 2, forming a sliding pair. Therefore, the right-side sliding grooves 131, the clearance cavities 111, and the left-side sliding grooves 121 can restrict the degrees of freedom of the throttling baffle 2, thereby allowing the throttling baffle 2 to reciprocate along the axial direction of the left-side sliding grooves 121 and the right-side sliding grooves 131.

[0055] On the opposite side of the first side plate 11, a fourth side plate 14 is also provided. Multiple support slots 141 are provided on the fourth side plate 14. The support slots 141 allow the free end of the throttling baffle 2 to be inserted into the cylindrical material channel 1 after entering it. Therefore, when the throttling baffle 2 is fully inside the cylindrical material channel 1, its free end can be detachably inserted into the support slot 141, thereby enhancing structural strength.

[0056] Figure 3 for Figure 1 The front view at point A. As can be seen from the figure, a ramp 22 is provided on the side of the throttling baffle 2 near the motor 3. The normal vector of the ramp 22 is biased towards the downstream direction of the cylindrical feed channel 1 (in this embodiment, it is...). Figure 3 The inclined plane of the inclined platform 22 is perpendicular to the axis of the cylindrical feed channel 1, and the angle between the inclined plane of the inclined platform 22 and the axis of the cylindrical feed channel 1 is θ, wherein θ satisfies 30°≤θ≤60°. In this embodiment, θ is 45°. A rack 23 is provided on the inclined plane of the inclined platform 22. The rack 23 can mesh with the gear 31 mounted on the output shaft of the motor 3 to form a gear pair. Thus, the rotational displacement of the motor 3 is converted into the translational displacement of the throttling baffle 2. In this embodiment, the motor 3 is mounted vertically on the first side plate 11, so the gear 31 mounted on the output shaft of the motor 3 is a bevel gear; in other embodiments, the motor 3 can also be mounted in an inclined state on the first side plate 11 or the second side plate 12. When the output shaft of the motor 3 is parallel to the inclined plane of the inclined platform 22, the gear 31 can also be a cylindrical gear. Furthermore, since the rack 23 is located on the inclined surface of the ramp 22, that is, on the side away from the throttling baffle 2 that is directly impacted by the material (in this embodiment, the upper side), the rack 23 is not easily disturbed by the material, which to a certain extent ensures the transmission efficiency between the motor 3 and the throttling baffle 2.

[0057] Figure 4 This diagram illustrates the structure of the alumina feeding control device in this embodiment, showing multiple throttling baffles entering the cylindrical feed channel. When it is necessary to reduce the supply of alumina raw materials, simply activating the corresponding motor 3 pushes the designated throttling baffle into the cylindrical feed channel 1. When motor 3 drives the throttling baffle 2 into its working position, the throttling baffle 2 blocks the flow section of the cylindrical feed channel 1, restricting the material flow only through the through-holes 21 on the throttling baffle 2. This achieves rapid response and precise flow rate classification control.

[0058] In the aforementioned process of reducing the supply of alumina raw materials, when the first-stage throttling baffle 2 needs to be pushed into the cylindrical feed channel 1, the other throttling baffles 2 remain outside the cylindrical feed channel 1. When the nth-stage throttling baffle 2 is pushed into the cylindrical feed channel 1, preferably, the first-stage throttling baffle 2 is pushed into the cylindrical feed channel 1 first, then the second-stage throttling baffle 2 is pushed into the cylindrical feed channel 1, and so on, until the nth-stage throttling baffle 2 is pushed into the cylindrical feed channel 1. At this time, the n throttling baffles 2 in the cylindrical feed channel 1 together form a multi-stage fine flow control system. By throttling step by step, the flow overshoot problem that is easily caused by single-stage adjustment is avoided to a certain extent, a scientific and reasonable flow grade gradient is provided, and smooth transition of flow regulation and high control accuracy are ensured.

[0059] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An alumina feeding control device, installed at the feed inlet of an aluminum electrolysis cell, characterized in that, include: The cylindrical material channel (1) has a clearance cavity (111) on its first side plate (11). The throttling baffle (2) is slidably mounted on the first side plate (11) and can reciprocate into and out of the inner cavity of the material channel through the clearance cavity (111); the throttling baffle (2) is provided with an axial through hole (21) in the middle, and the flow cross-sectional area of ​​the through hole (21) is smaller than the nominal flow cross-sectional area of ​​the material channel (1); The motor (3) is fixed to the outer wall of the material channel (1), and its output end and the throttling baffle (2) form a motion transmission chain; When the motor (3) drives the throttling baffle (2) to enter the working position, its plate body blocks the flow section of the material channel, and the material passes through the through hole (21) in a limited manner.

2. The alumina feeding control device according to claim 1, characterized in that: The output shaft of the motor (3) is fixed to a gear (31). The throttling baffle (2) has a ramp (22) near the motor side, and a rack (23) that meshes with the gear (31) is machined on the ramp (22). in, The gear (31) and the rack (23) form a meshing pair, which can convert the rotational motion of the motor (3) into the linear displacement of the throttling baffle (2).

3. The alumina feeding control device according to claim 2, characterized in that, The normal vector of the inclined plane of the inclined platform (22) is biased towards the downstream direction of the cylindrical material channel (1); The angle between the inclined plane and the axis of the cylindrical material channel (1) is θ, and θ satisfies 30°≤θ≤60°.

4. The alumina feeding control device according to claim 1, characterized in that, The cylindrical material channel (1) also includes a second side plate (12) connected to both sides of the first side plate (11) and extending in the same direction as the first side plate (11) and a third side plate (13). The second side plate (12) has a left side groove (121) with the same height as the clearance cavity (111) of the first side plate (11) on the side facing the inside of the cylindrical material channel (1). The third side plate (13) has a right side groove (131) with the same height as the clearance cavity (111) of the first side plate (11) on the side facing the inside of the cylindrical material channel (1). in, The two sides of the throttling baffle (2) form a double-sided constraint sliding pair with the left side slide groove (121) and the right side slide groove (131) respectively, and the throttling baffle (2) can be translated along the extension direction of the slide groove.

5. The alumina feeding control device according to claim 1, characterized in that, The cylindrical material channel (1) also includes a fourth side plate (14) disposed on the opposite side of the first side plate (11). The fourth side plate (14) has a support slot (141) at the same height as the clearance cavity (111) of the first side plate (11) on the side facing the inside of the cylindrical material channel (1). in, When the throttling baffle (2) is fully inside the cylindrical material channel (1), one end of the throttling baffle (2) facing the fourth side plate (14) can be inserted into the support slot (141).

6. The alumina feeding control device according to claim 1, characterized in that, It includes multiple throttling baffles (2), and the through holes (21) on the multiple throttling baffles (2) have different areas for material to pass through; The plurality of the throttling baffles (2) are arranged in descending order of the area of ​​their through holes (21) through which material can pass, along the axial direction of the cylindrical material channel (1).

7. The alumina feeding control device according to claim 6, characterized in that, Along the material flow direction in the cylindrical material channel (1), the flow cross-sectional area A_{1} of the through hole (21) of the first-stage throttling baffle (2) and the material flow cross-sectional area A_{0} of the cylindrical material channel (1) satisfy: A_{1}=0.8*A_{0}; The flow cross-sectional area A_{n} of the subsequent nth stage throttling baffle (2) and the flow cross-sectional area A_{n-1} of the previous stage throttling baffle (2) satisfy the recursive relationship: A_{n}=0.8* A_{n-1}, where n≥2.

8. The alumina feeding control device according to claim 6, characterized in that, It includes at least 4 throttling baffles (2).

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