A granular silicon dust removal system

Abstract

The application discloses a granular silicon dust removal system in the field of granular silicon dust removal, which comprises an air inlet unit, a humidifying unit and a dust removal unit. The dust removal unit is arranged between the air inlet unit and the humidifying unit, is arranged obliquely, and is connected with the air outlet end of the air inlet unit at the low end and the air outlet end of the humidifying unit at the high end. A separation tank is further connected between the dust removal unit and the humidifying unit, and a separation assembly is arranged in the separation tank and used for intercepting the granular silicon. The bottom of the separation tank is further connected with the feeding end of the dust removal unit. When in use, the gas enters the separation tank, the space is increased, and part of the granular silicon falls. The granular silicon flowing with the gas is bounced and passively falls after colliding with the separation assembly. The separation assembly has a good blocking effect, and the granular silicon is recovered into the dust removal unit, so that the device can well avoid material waste.

Description

Technical Field

[0001] This application relates to the field of particulate silicon dust removal technology, specifically to a particulate silicon dust removal system. Background Technology

[0002] Chinese patent CN117019763A discloses a method and apparatus for continuous removal of dust from the surface of granular silicon, including a roller unit, a feeding unit, and an air intake unit. The roller unit is inclined, with one end higher than the other. The feeding unit is located at the higher end of the roller unit and is used to feed granular silicon material into the roller unit. The air intake unit is located at the lower end of the roller unit and is used to introduce clean gas into the roller unit, which blows the dust in the roller unit to the other end for discharge. This invention enables continuous feeding and discharging of granular silicon, humidification and removal of static electricity between particles to achieve fully enclosed system operation, prevent the introduction of external impurities, realize continuous production, reduce unnecessary manual input, and reduce waiting time for feeding and discharging, effectively improving production capacity. However, during the rotation of the roller, a small amount of granular silicon will be carried out with the gas. Although the amount per unit time is small, the equipment works continuously for a long time, which will still cause waste in the long run and relatively reduce profits. Utility Model Content

[0003] The purpose of this application is to provide a particulate silicon dust removal system to address the shortcomings of existing technologies that lead to the waste of particulate silicon.

[0004] To achieve the above objectives, this application employs the following technical solution:

[0005] This application discloses a particulate silicon dust removal system, which includes

[0006] Intake unit;

[0007] Humidification unit;

[0008] A dust removal unit is provided between the air intake unit and the humidification unit. The dust removal unit is inclined and its lower end is connected to the air outlet of the air intake unit, while its upper end is connected to the air outlet of the humidification unit.

[0009] The dust removal unit and the humidification unit are connected by a separation tank. The separation tank is equipped with an isolation component for intercepting the particulate silicon. The bottom of the separation tank is also connected to the feed end of the dust removal unit.

[0010] In a further embodiment of this application, the air intake unit includes a first pipeline and a second pipeline, the second pipeline being used for gas plasmaization, and the second pipeline and the second pipeline being interconnected.

[0011] In a further embodiment of this application, the dust removal unit includes an axially rotatable drum, the inner wall of which is spirally provided with baffles, the drum is arranged at different heights, a connecting part one is rotatably installed at the high end of the drum, and a connecting part two is rotatably installed at the low end of the drum.

[0012] The lower end of the connecting part is provided with a discharge port and a gas outlet; the gas outlet is connected to the separating tank.

[0013] The lower end of the connecting part two is provided with a material discharge port, and the top is provided with a material inlet communicating with the roller, and also with a gas inlet; the gas inlet is connected to the gas outlet of the air inlet unit;

[0014] In a further embodiment of this application, the dust removal unit further includes a drive unit, the roller is fixed to the base by a rotating bracket, and the drive unit includes a motor fixed to the base and a gear radially fixed to the roller, wherein the drive teeth on the output shaft of the motor mesh with the gear.

[0015] In a further embodiment, the inner wall of the roller is coated with a polyurethane layer.

[0016] In a further embodiment of this application, the isolation assembly includes a perforated plate and a filter screen with water slicks fixed inside the separation tank.

[0017] In a further embodiment, the filter screen is positioned higher than the perforated plate.

[0018] In a further embodiment of this application, the dust removal unit, the separation tank, and the humidification unit are arranged in space from low to high.

[0019] In a further embodiment of this application, the air intake unit, dust removal unit, separator, and humidification unit are all sequentially connected via pipelines.

[0020] The beneficial effects of this application are as follows:

[0021] This application designs a separation tank. When the gas enters the separation tank, the increased space causes the airflow to decrease, and some particulate silicon falls. The particulate silicon that follows the gas flow bounces off the isolation component and falls passively. The isolation component plays a good role in blocking the flow and recovers this part of the particulate silicon into the dust removal unit. The device can effectively avoid material waste and achieve the functions of cost reduction and efficiency improvement.

[0022] The air intake unit generates plasma gas, which can effectively eliminate the static electricity generated by the silicon particles during rolling and mutual friction, preventing dust from adhering to the silicon particles and enhancing the dust removal effect. Attached Figure Description

[0023] Figure 1This is a schematic diagram of the particulate silicon dust removal system in the embodiments of this application.

[0024] The components include: 10. Air intake unit; 20. Dust removal unit; 30. Humidification unit;

[0025] 102. Air inlet; 103. Main pipe; 104. Air outlet; 105. Ionizing air generator;

[0026] 201. Drum; 202. Polyurethane layer; 203. Gear; 204. Motor; 205. Baffle; 206. Connecting device; 207. Material inlet; 209. Discharge port; 211. Material discharge port; 213. Gas inlet; 214. Gas outlet; 215. Transfer pipe; 216. Separator; 217. Filter screen; 218. Perforated plate; 219. Recovery pipe; 221. Main discharge pipe. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use.

[0028] like Figure 1 As shown, this embodiment of a particulate silicon dust removal system includes an air inlet unit 10, a dust removal unit 20, and a humidification unit 30 connected in sequence; the dust removal unit 20 is inclined, and the lower end of the dust removal unit 20 is connected to the air outlet of the air inlet unit 10, and the upper end of the dust removal unit 20 is connected to the air outlet of the humidification unit 30.

[0029] The dust removal unit 20 and the humidification unit 30 are connected by a separation tank 216. The separation tank 216 is equipped with an isolation component for intercepting particulate silicon. The bottom of the separation tank 216 is also connected to the feed end of the dust removal unit 20. In the space, the dust removal unit 20, the separation tank 216 and the humidification unit 30 are arranged from low to high.

[0030] In use, the air intake unit is activated to generate purging gas, which enters the dust removal unit 20. The movement of the dust removal unit 20 causes the silicon particles inside the gas to move, generating dust. At the same time, the purging gas carries the dust generated by the friction of the silicon particles out of the dust removal unit 20. The mixed impurities enter the separator 216 (the diameter of the separator is larger than the diameter of the pipeline), where the flow rate decreases. The isolation components set in the separator 216 can also block the remaining silicon particles. Finally, all of them are collected into the feed end of the dust removal unit 20, reducing the loss of silicon particles, saving costs, and reducing waste.

[0031] In some embodiments, a particulate silicon dust removal system is designed as follows.

[0032] The air intake unit 10 includes high-purity nitrogen gas from the air intake 101. The nitrogen gas is divided into two paths. One path enters the plasma air generator 105 through an external pipeline. The plasma nitrogen gas from the plasma air generator 105 is mixed with nitrogen gas from the main pipe 102 through a pipeline and then used as purge gas. It enters the drum dust collector unit 20 through the air outlet 103 and the gas inlet 213.

[0033] The dust removal unit 20 includes a base and a roller 201. The roller 201 is mounted on the base via a rotating bracket. Typically, the roller 201 is a Y-shaped bracket with multiple arc-shaped bearings fixed to the top. The outer wall of the roller 201 has radially arranged mounting grooves. During installation, the bearings are placed in the mounting grooves, and the bottom of the Y-shaped bracket is fixed to the base. In addition, the left side of the roller 201 is higher than the right side, so the gas enters the roller 201 from the lower side, which to a certain extent prolongs the dust removal time of particulate silicon (the gas stays in the roller 201 for a relatively longer time) and improves the dust removal effect.

[0034] The high end of the drum 201 is equipped with a connecting part one, and the low end of the drum 201 is equipped with a connecting part two. The connecting parts here use hollow kits. The low end of the connecting part one is provided with a discharge port 209, and the side away from the drum 201 is also provided with a gas outlet 214. The gas outlet 214 is connected to the separator tank 216. Both the connecting parts one and two are rotatably connected to the drum 201 through the connecting device 206. In the specific installation, the connecting device 206 can use a bearing. The specific installation is not described in detail. The connection should be properly sealed. The low end of the connecting part two is provided with a material discharge port 211, and the top is provided with a material inlet 207 that communicates with the drum 201. It is also provided with a gas inlet 213. The gas inlet 213 is connected to the gas outlet of the air inlet unit 10.

[0035] In use, the granular silicon is put into the pipe and then enters the interior of the roller 201 through the material inlet 207. The inside of the roller 201 is provided with a clean polyurethane layer 202 to prevent the granular silicon from contacting the roller 201. The inner wall of the roller 201 is spirally provided with semi-circular or arc-shaped baffles 205. When the roller 201 is rotated, the baffles 205 continuously convey the material to a higher position until it is discharged from the outlet 209.

[0036] The roller 201 rotates via a drive unit. In this embodiment, the drive unit includes a motor 204 fixed to the base and a gear 203 radially fixed to the roller 201. The drive teeth on the output shaft of the motor 204 mesh with the gear 203.

[0037] As the drum 201 rotates, the material at the bottom of the drum 201 is lifted up by the semi-circular or arc-shaped baffle 205 and thrown down from a height. The high-purity nitrogen purging gas from the gas inlet 213 blows through the inside of the drum 201, further separating the silicon powder and granular silicon. The plasma gas contained in the purging gas can effectively eliminate the static electricity generated by the granular silicon during rolling and mutual friction.

[0038] In this embodiment, the isolation assembly includes a perforated plate 218 and a filter screen 217 that are horizontally spaced and fixed inside the separation tank 216.

[0039] A small amount of particulate silicon, along with silicon powder and nitrogen, is carried away from the gas outlet 214 of the dust removal unit 20 and enters the silicon powder and particulate silicon separation tank 216 through the transmission pipe 215. In the separation tank 216, the space inside the separation tank 216 suddenly increases, which is conducive to the separation of the small amount of particulate silicon that was carried out due to gravity.

[0040] Meanwhile, the separator 216 is equipped with a perforated plate 218 and a filter screen 217. A small amount of silicon particles that are not separated by gravity are carried by the gas and encounter the perforated plate 218, where they are blocked. Because the silicon particles impact the perforated plate 218, they passively fall. The silicon powder passing through the perforated plate 218 contains even fewer silicon particles, and the silicon particles and silicon powder are separated by the filter screen 217. The perforated plate 218 reduces the load on the filter screen 217. A backflushing gas pipe can also be installed at the top of the separator 216 to ensure the filter screen 217 remains unobstructed. In the separator 216, the silicon particles carried away from the drum 201 by the purge gas are separated and returned to the drum 201 via the recovery pipe 219 and material inlet 207. The silicon particles separated in the separator 216 can be returned to the drum 201 continuously or intermittently.

[0041] The humidification unit 30 mainly uses a humidification device. When in use, nitrogen gas passes through the pipeline humidification device. In the humidification device, the nitrogen gas is humidified. The humidified nitrogen gas is discharged from the humidification device and mixed with the nitrogen gas containing silicon powder in the separation tank 216. This humidifies the silicon powder from the separation tank 216, eliminates the static electricity generated by the silicon powder during the later transportation process, and facilitates the later recovery of silicon powder.

[0042] The entire system has a good dust removal effect and can eliminate static electricity in silicon powder, enabling stable recovery of silicon powder.

[0043] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

Claims

1. A particulate silicon dust removal system, characterized in that, include Intake unit; Humidification unit; A dust removal unit is provided between the air intake unit and the humidification unit. The dust removal unit is inclined and its lower end is connected to the air outlet of the air intake unit, while its upper end is connected to the air outlet of the humidification unit. The dust removal unit and the humidification unit are connected by a separation tank. The separation tank is equipped with an isolation component for intercepting the particulate silicon. The bottom of the separation tank is also connected to the feed end of the dust removal unit.

2. The particulate silicon dust removal system according to claim 1, characterized in that, The air intake unit includes a first pipe and a second pipe, the second pipe being used for gas plasmaization, and the second pipe and the second pipe being interconnected.

3. The particulate silicon dust removal system according to claim 1, characterized in that, The dust removal unit includes an axially movable A rotating drum, the inner wall of which is spirally provided with baffles, the drum is arranged at different heights, a connecting part one is rotatably installed at the upper end of the drum, and a connecting part two is rotatably installed at the lower end of the drum; The lower end of the connecting part is provided with a discharge port and a gas outlet; the gas outlet is connected to the separating tank. The lower end of the second connecting part is provided with a material discharge port, and the top is provided with a material inlet communicating with the roller, as well as a gas inlet; the gas inlet is connected to the gas outlet of the air inlet unit.

4. The particulate silicon dust removal system according to claim 3, characterized in that, The dust removal unit also includes a drive unit. The roller is fixed to the base by a rotating bracket. The drive unit includes a motor fixed to the base and a gear radially fixed to the roller. The drive teeth on the output shaft of the motor mesh with the gear.

5. The particulate silicon dust removal system according to claim 3, characterized in that, The inner wall of the roller is coated with a polyurethane layer.

6. The particulate silicon dust removal system according to claim 1, characterized in that, The isolation assembly includes a perforated plate and a filter screen that are fixed at horizontal intervals within the separation tank.

7. The particulate silicon dust removal system according to claim 6, characterized in that, The filter screen is positioned higher than the perforated plate.

8. The particulate silicon dust removal system according to claim 1, characterized in that, The dust removal unit, the separation tank, and the humidification unit are arranged from low to high in the space.

9. The particulate silicon dust removal system according to claim 1, characterized in that, The air intake unit, dust removal unit, separator, and humidification unit are all connected sequentially via pipelines.

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