Fan-shaped uniform feeding device

Abstract

The utility model discloses a fan -shaped even feeding device relates to feeding device technical field, including the blanking bottom plate and the control material baffle, be provided with the blanking port on the blanking bottom plate, the control material baffle covers on blanking port and with the support shaft rotation connection that is provided on the blanking bottom plate, through the control material baffle with support shaft is the axle rotation, realizes the opening size of adjusting blanking port, the fan -shaped even feeding device in the utility model, through angle control flow passage cross -section area size, realizes the control of reactor feeding quantity, through the open area reduction of increasing in unit length within the impurity blockage risk, solves the problem that the feeding device exists and feeds unevenly, and the problem of frequent blockage.

Description

Technical Field

[0001] This utility model relates to the field of feeding device technology, and in particular to a fan-shaped uniform feeding device. Background Technology

[0002] In the electrolytic aluminum production industry, hydrogen fluoride (HF) and dust emissions are the main pollutants. Dry adsorption purification technology using alumina is currently the mainstream treatment method. Its principle is to utilize alumina particles to adsorb fluorides in flue gas and achieve gas-solid separation through filter bags or filter cartridges. However, existing technologies still have the following problems in practical applications:

[0003] Insufficient uniformity of feed: If the fresh alumina feed is not distributed evenly, it will cause fluctuations in the adsorption efficiency in the reactor, which in turn will affect the stability of the fluoride emission concentration.

[0004] Material blockage risk: During the conveying process, alumina is prone to blockage of the chute due to material control methods and the accumulation of impurities, requiring frequent manual cleaning and affecting the continuous operation of the system.

[0005] The equipment has a simple structure: the existing feeding device relies on the control plate for regulation, and is entirely controlled by manual experience. There is no control indicator, which can easily lead to insufficient or no material in the end reactor.

[0006] The aforementioned problems directly lead to fluctuations in purification efficiency and an increase in fluoride salt consumption, necessitating a mechanical, highly reliable, uniform feeding device.

[0007] II. Analysis of Existing Similar Technical Solutions

[0008] 1. Insert plate feeding device (closest to existing technology)

[0009] Technical principle: The material flow rate is controlled by adjusting the orifice plate and sliding door through the fresh alumina chute.

[0010] Typical structure: The side wall of the fresh alumina chute is equipped with adjustable openings, and the flow rate can be adjusted by sliding adjustment plates.

[0011] Advantages: Flow control is achieved through mechanical adjustment.

[0012] Disadvantages: The regulating plate relies on manual operation and has no opening indication, which cannot guarantee the uniformity of feeding in each reactor; it is prone to blockage due to the accumulation of material impurities.

[0013] 2. Electric control device for feeding gate

[0014] Technical principle: The gate is raised and lowered by a vertical screw, and the opening and closing of the feeding port is adjusted by remote control.

[0015] Typical structure: A screw drive mechanism is installed on the support frame, and the motor drives the screw to rotate to control the gate height; a matching sensor monitors the material flow rate to achieve closed-loop control.

[0016] Advantages: Reduces manual intervention and improves feeding efficiency.

[0017] Disadvantages: It only solves the problem of gate opening and closing, without addressing the optimization of material mixing and distribution; it is sensitive to particulate matter caking and is prone to jamming during long-term operation.

[0018] 3. Automatic removal device for caking material

[0019] Technical principle: The spiral conveyor blades are used to screen agglomerated particles, and a fluidized bed is used to achieve fine material circulation.

[0020] Typical structure:

[0021] The screw conveyor separates impurities with a particle size >3mm; the undersize fine material enters the fluidized bed, and the conveying speed is controlled by the material level sensor.

[0022] Advantages: Reduces the risk of material blockage and improves system continuity.

[0023] Disadvantages: It requires additional screens and fluidized bed, taking up a lot of space; it cannot optimize the uniformity of feeding, and is only for the treatment of impurities in the later stage.

[0024] Current status of existing plate feeding devices

[0025] Technical principle: The material flow rate is controlled by adjusting the orifice plate and sliding door through the fresh alumina chute.

[0026] Typical structure: The side wall of the fresh alumina chute is equipped with adjustable openings, and the flow rate can be adjusted by sliding adjustment plates.

[0027] Advantages: Flow control is achieved through mechanical adjustment.

[0028] Disadvantages: The regulating plate relies on manual operation based on experience and has no opening degree indication, which cannot guarantee the uniformity of feeding in each reactor; it is prone to blockage due to the accumulation of material impurities.

[0029] In summary, existing feeding devices suffer from problems such as uneven feeding and frequent blockages. Utility Model Content

[0030] The purpose of this invention is to provide a fan-shaped uniform feeding device to solve the problems existing in the prior art. By controlling the uniform feeding of alumina and reducing the risk of impurity blockage through the opening angle of the fan shape, it achieves the purpose of controlling the uniform feeding of alumina and reducing the risk of impurity blockage.

[0031] To achieve the above objectives, this utility model provides the following solution:

[0032] This utility model provides a fan-shaped uniform feeding device, including a feeding base plate and a material control baffle. The feeding base plate is provided with a feeding port, and the material control baffle covers the feeding port and is rotatably connected to a support shaft provided on the feeding base plate. By controlling the material control baffle to rotate around the support shaft, the opening size of the feeding port can be adjusted.

[0033] Preferably, the discharge port is a fan-shaped hole with a central angle of 60°.

[0034] Preferably, the material control baffle is a fan-shaped plate with a central angle of 75°.

[0035] Preferably, the material control baffle is sleeved on the support shaft via a connecting disc.

[0036] Preferably, a ratchet is welded to the top of the connecting disc, and a pawl that cooperates with the ratchet is provided on the feeding base plate, so that the feeding angle is positioned by the cooperation of the ratchet and the pawl.

[0037] Preferably, a limiting plate is provided at the top of the support shaft, and a compression spring sleeved on the support shaft is provided between the limiting plate and the ratchet, with the two ends of the compression spring abutting against the limiting plate and the ratchet respectively.

[0038] Preferably, the top of the material control baffle is also provided with a handle, which controls the rotation of the material control baffle.

[0039] Preferably, an angle gauge is provided on the feeding base plate at a position opposite to the feeding port, and the angle gauge is used to read the opening angle of the feeding port.

[0040] The present invention achieves the following technical advantages over the prior art:

[0041] The fan-shaped uniform feeding device of this utility model controls the amount of feed into the reactor by controlling the cross-sectional area of ​​the flow channel through angle control. It also reduces the risk of impurity blockage by increasing the opening area per unit length, thus solving the problems of uneven feeding and frequent blockage in feeding devices. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a top view of the fan-shaped uniform feeding device of this utility model;

[0044] Figure 2 This is a front view of the fan-shaped uniform feeding device of this utility model;

[0045] In the diagram: 1. Feeding base plate; 2. Material control baffle; 3. Feeding port; 4. Support shaft; 5. Connecting disc; 6. Ratchet; 7. Pawl; 8. Limiting plate; 9. Compression spring; 10. Handle; 11. Angle ruler. Detailed Implementation

[0046] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0047] The purpose of this invention is to provide a fan-shaped uniform feeding device to solve the problems existing in the prior art.

[0048] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] The fan-shaped uniform feeding device in this embodiment, such as Figures 1-2 As shown, the device includes a feeding base plate 1 and a material control baffle 2. The feeding base plate 1 has a feeding port 3. The material control baffle 2 covers the feeding port 3 and is rotatably connected to a support shaft 4 on the feeding base plate 1. By controlling the rotation of the material control baffle 2 around the support shaft 4, the opening size of the feeding port 3 can be adjusted. The material control baffle 2 can rotate at multiple angles, ensuring that the cross-sectional area of ​​the alumina flow channel is controllable and guaranteeing uniform material distribution.

[0050] In this specific embodiment, the feed port 3 is a fan-shaped hole with a central angle of 60°; the control baffle 2 is a fan-shaped plate with a central angle of 75°. The fan-shaped angle ensures the amount of alumina material; the opening area of ​​the traditional insert-type control plate is optimized, reducing the risk of impurity blockage.

[0051] In this specific embodiment, the material control baffle 2 is sleeved on the support shaft 4 via a connecting disc 5. The bottom of the support shaft 4 is welded to the unloading base plate 1 for fixation.

[0052] In this specific embodiment, a ratchet 6 is welded to the top of the connecting disc 5, and a pawl 7 is provided on the feeding base plate 1 to cooperate with the ratchet 6. The feeding angle is positioned by the cooperation of the ratchet 6 and the pawl 7. When the material control baffle 2 is adjusted to the required feeding angle, the position of the material control baffle 2 is locked by the ratchet 6 and the pawl 7.

[0053] In this specific embodiment, a limiting plate 8 is provided at the top of the support shaft 4, and a compression spring 9 sleeved on the support shaft 4 is provided between the limiting plate 8 and the ratchet 6. The two ends of the compression spring 9 abut against the limiting plate 8 and the ratchet 6, respectively. The compression spring 9 is used to press the material control baffle 2.

[0054] In this specific embodiment, a handle 10 is also provided on the top of the material control baffle 2, and the material control baffle 2 is rotated by the handle 10.

[0055] In this specific embodiment, an angle ruler 11 is provided on the bottom plate 1 opposite to the discharge port 3. The angle ruler 11 is used to read the opening angle of the discharge port 3. When the required discharge angle needs to be adjusted, the angle ruler 11 can be used to determine whether the material control baffle 2 is in place.

[0056] Calculation of flow rate for fresh alumina chute conveying:

[0057] 1. Key Parameter Compilation

[0058] Chute dimensions: width 250mm (0.25m), height 300mm (0.3m)

[0059] Air supply pressure: 6.5 kPa (Please confirm whether this is the driving pressure or pressure drop).

[0060] Material: Fresh alumina (ultra-dense phase conveying, typically solid-to-gas ratio >50)

[0061] Assumptions:

[0062] The system is in a steady flow state. Local resistance is ignored, and only pressure drop along the flow path is considered.

[0063] Alumina density (ρ) p )≈1,000kg / m 3 air density (ρ) a )≈1.2kg / m 3 .

[0064] The flow rate of the ultra-dense phase is usually low (on the order of 0.1 to 1 m / s).

[0065] 2. Flow velocity estimation method

[0066] The flow rate (v) of the ultra-dense phase transport can be initially estimated through the relationship between material balance and pressure drop:

[0067] Step 1: Calculate airflow

[0068] If the supply air pressure (ΔP) is used entirely to overcome the pressure drop in the chute, the Darcy-Weisbach formula applies: ΔP=f*L / Dh*ρ a v 2 / 2

[0069] Dh is the hydraulic diameter (rectangular chute):

[0070] Dh = 2 × width × height / (width + height) = 2 × 0.25 × 0.3 / (0.25 + 0.3) ≈ 0.273mf is the friction coefficient (which needs to be determined based on the Reynolds number and roughness; for now, we assume f ≈ 0.02).

[0071] The chute length L = 10m.

[0072] Obtain air velocity (Va):

[0073]

[0074] Step 2: Correction of ultra-dense phase flow rate

[0075] Solid particles in a highly concentrated phase can significantly reduce the actual flow rate. Empirically:

[0076] v≈va / 50-va / 100

[0077] (When the solid-to-gas ratio is high, the airflow velocity is much higher than the material velocity.)

[0078] Therefore: v≈12.1 / 50~12.1 / 100=0.24~0.12m / s

[0079] Known

[0080] Defluorination end reactor mass flow rate: Qm = 2.91 tons / hour

[0081] Alumina density: ρ = 1000 kg / m³ 3 = 1 ton / m 3

[0082] Mass flow rate converted to volumetric flow rate

[0083] Volumetric flow rate Q satisfies:

[0084] Q = Qmρ = 2.91 tons / hour 1 ton / m 3 =2.91m 3 / Hour

[0085] Convert to standard units:

[0086] Q = 2.91 / 3600 ≈ 0.00080833m3 / s

[0087] The cross-sectional area can be obtained by solving the formula Q = v × A:

[0088] A = Q / v

[0089] When v = 0.24 m / s, A = 0.00080833 / 0.24 ≈ 0.003368 m 2

[0090] When v = 0.12 m / s, A = 0.00080833 / 0.12 ≈ 0.006736 m 2

[0091] Therefore, the cross-sectional area of ​​the flow channel must meet the requirement of 0.0034m². 2 ≤A≤0.0067m 2

[0092] When the opening sector is 60° and the control baffle radius is 12cm, the discharge port radius is 7cm. The corresponding area relationship is as follows:

[0093] 30° 31.13 square centimeters

[0094] 46.71 square centimeters at 45°

[0095] 62.28 square centimeters at 60°

[0096] By controlling the cross-sectional area of ​​the flow channel by angle, the amount of feed into the reactor can be controlled, and the risk of impurity blockage can be reduced by increasing the opening area per unit length.

[0097] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A fan-shaped uniform feeding device, characterized in that: It includes a material feeding base plate and a material control baffle. The material feeding base plate is provided with a material feeding port. The material control baffle covers the material feeding port and is rotatably connected to a support shaft provided on the material feeding base plate. By controlling the material control baffle to rotate around the support shaft, the opening size of the material feeding port can be adjusted.

2. The fan-shaped uniform feeding device according to claim 1, characterized in that: The discharge port is a fan-shaped hole with a central angle of 60°.

3. The fan-shaped uniform feeding device according to claim 1, characterized in that: The material control baffle is a fan-shaped plate with a central angle of 75°.

4. The fan-shaped uniform feeding device according to claim 3, characterized in that: The material control baffle is sleeved on the support shaft via a connecting disc.

5. The fan-shaped uniform feeding device according to claim 4, characterized in that: A ratchet is welded to the top of the connecting disc, and a pawl that cooperates with the ratchet is provided on the feeding base plate. The feeding angle is positioned by the cooperation of the ratchet and the pawl.

6. The fan-shaped uniform feeding device according to claim 5, characterized in that: A limiting plate is provided at the top of the support shaft, and a compression spring sleeved on the support shaft is provided between the limiting plate and the ratchet. The two ends of the compression spring abut against the limiting plate and the ratchet, respectively.

7. The fan-shaped uniform feeding device according to claim 1, characterized in that: The top of the material control baffle is also provided with a handle, which controls the rotation of the material control baffle.

8. The fan-shaped uniform feeding device according to claim 1, characterized in that: An angle gauge is provided on the bottom plate opposite to the discharge port, and the angle gauge is used to read the opening angle of the discharge port.

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