Spill-proof automatic powder discharging device for particle silicon by-product silicon powder
By designing an automatic powder discharge device and utilizing components such as a vacuum dust collector and a flow control valve, the problems of environmental pollution and health risks in silicon powder emissions were solved, and stable, low-waste silicon powder emissions were achieved.
Patent Information
- Application Number
- CN202520019086.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-06
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2035-01-06
AI Technical Summary
In the existing technology, silicon powder is directly discharged through the open port, causing environmental pollution and damage to the occupational health of operators. The unstable control of the manual ball valve causes silicon powder to spray out, and the discharge speed cannot be effectively controlled.
An automatic powder discharge device including a silicon powder storage container, a silicon powder collection container, a silicon powder filter and a vacuum dust collector was designed. Silicon powder was collected by negative pressure and the discharge was controlled by a flow control valve and a shut-off valve to reduce silicon powder escape.
It effectively prevents silicon powder splashing, reduces environmental pollution and occupational health risks, improves the stability and efficiency of emission control, and reduces silicon powder waste.
Smart Images
Figure CN223355947U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of granular silicon production, in particular to an overflow-proof automatic powder discharge device for granular silicon byproduct silicon powder. Background Art
[0002] In the granular silicon process, silane gas enters the fluidized bed and is subjected to high temperatures, decomposing it into silicon and hydrogen. The silicon accumulates on the seed crystals, growing into particles of a certain size that are discharged into the product collector and sold as a product. A small amount of silane decomposes to form metallic silicon powder. This metallic silicon powder is called silicon powder, a byproduct, and must be regularly discharged from the system.
[0003] In related prior art, silicon powder is discharged directly into open silicon powder bags through a discharge pipeline. The gas within the bags can carry some of the silicon powder with it into the atmosphere, causing environmental pollution and harming the occupational health of operators. Furthermore, a manual ball valve is installed on the discharge pipeline to control the flow of silicon powder in the pipeline. Due to the high torque of the manual ball valve, manual control of the valve can lead to an inability to close or reduce the valve opening in a timely manner, resulting in excessive silicon powder discharge. This can cause more silicon powder to be ejected from the bags, further polluting the environment and harming the occupational health of operators.
[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to ordinary technicians in this field. Utility Model Content
[0005] Purpose of the utility model: The technical problem to be solved by the utility model is to provide an automatic powder discharge device for granular silicon byproduct silicon powder which can prevent overflow, so as to reduce environmental pollution and damage to the occupational health of operators.
[0006] In order to solve the above technical problems, the utility model discloses an automatic discharge device for silicon powder, a by-product of granular silicon, which can prevent overflow. The device comprises:
[0007] A silicon powder storage container for storing silicon powder, including a discharge port;
[0008] A silicon powder collection container includes a feed port and an exhaust port; the discharge port of the silicon powder storage container is selectively connected to the feed port of the silicon powder collection container;
[0009] And a powder exhaust filtration unit, including a silicon powder filter and a vacuum dust collector, the silicon powder filter is connected to the exhaust port of the silicon powder collection container, and the vacuum dust collector is connected to the silicon powder filter; the vacuum dust collector is used to provide negative pressure to the silicon powder filter and the silicon powder collection container.
[0010] In some embodiments, the device includes a powder discharge pipeline and a first shut-off valve. The discharge port of the silicon powder storage container is connected to the feed port of the silicon powder collection container through the powder discharge pipeline. The first shut-off valve is provided on the powder discharge pipeline, and the first shut-off valve is used to control the on and off of the powder discharge pipeline.
[0011] In some embodiments, the device includes a flow control valve, and the flow control valve is provided on the powder discharge pipeline.
[0012] In some embodiments, the flow control valve is a pneumatic control valve.
[0013] In some embodiments, two first shut-off valves are provided.
[0014] In some embodiments, two first shut-off valves are disposed between the silicon powder storage container and the flow control valve.
[0015] In some embodiments, the device includes an exhaust line, and the silicon powder filter is connected to the exhaust port of the silicon powder collection container through the exhaust line.
[0016] In some embodiments, the apparatus includes a pressure gauge connected to the exhaust line.
[0017] In some embodiments, the apparatus comprises a second shut-off valve disposed on the exhaust line.
[0018] In some embodiments, the silicon powder collection container is a silicon powder collection bag, comprising a main bag cavity, an upper bag cavity directly connected to the main bag cavity, and a powder inlet sleeve. The powder inlet sleeve has a top opening and a bottom opening. The bottom opening of the powder inlet sleeve is located in the main bag cavity, and the top opening of the powder inlet sleeve extends upwardly out of the upper bag cavity to serve as the feed port of the silicon powder collection container. The exhaust port of the silicon powder collection container is located on the side wall of the upper bag cavity.
[0019] Beneficial effects:
[0020] 1. This utility model's overflow-proof automatic discharge device for granular silicon byproduct, silicon powder, uses a vacuum dust collector to apply negative pressure to the silicon powder filter and the silicon powder collection container. Most of the silicon powder is collected in the silicon powder collection container, and gas carrying a small amount of silicon powder flows from the silicon powder collection container to the silicon powder filter under the negative pressure. The gas filtered by the silicon powder filter is then discharged through the vacuum dust collector. Compared to the prior art method of directly discharging silicon powder into an open silicon powder collection container, this utility model avoids the environmental pollution and occupational health impacts caused by the direct discharge of silicon powder-containing gas into the atmosphere after overflow.
[0021] 2. The utility model provides a flow control valve on the powder discharge pipeline. The flow control valve is used to control the flow rate of the powder discharged in the powder discharge pipeline to prevent the discharge speed from being too fast, which may lead to an increase in the pressure of the vacuum dust collector and further cause silicon powder overflow.
[0022] 3. The utility model adopts a special silicon powder collection bag, which can minimize the silicon powder from being raised and escaping from the exhaust port to the exhaust pipeline along with the gas, causing waste of silicon powder.
[0023] 4. The utility model adopts two first shut-off valves to ensure that the powder discharge pipeline is reliably shut off when the powder discharge work is not in progress.
[0024] 5. The utility model provides a second shut-off valve on the exhaust pipeline, and shuts off the exhaust pipeline through the second shut-off valve to allow the silicon powder filter to be cleaned. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, and the above and / or other advantages of the present invention will become more apparent.
[0026] Figure 1 A schematic structural diagram of an overflow-proof automatic discharge device for granular silicon byproduct silicon powder provided by an embodiment of the present invention.
[0027] Description of the accompanying drawings:
[0028] 1. Silicon powder storage container; 11. Feeding port; 2. Silicon powder collection container; 21. Feeding port; 22. Exhaust port; 23. Bag main cavity; 24. Bag upper cavity; 25. Powder inlet sleeve; 26. Bottom opening; 3. Silicon powder filter; 4. Vacuum dust collector; 51. Powder discharge pipeline; 52. First shut-off valve; 53. Flow control valve; 54. Control box; 61. Exhaust pipeline; 62. Pressure gauge; 63. Second shut-off valve; 7. Vent pipeline. DETAILED DESCRIPTION
[0029] like Figure 1 As shown, the utility model provides an overflow-proof automatic discharge device for granular silicon byproduct silicon powder, which includes a silicon powder storage container 1, a silicon powder collection container 2 and a powder discharge filter unit.
[0030] like Figure 1As shown, the silicon powder storage container 1 is used to store silicon powder and can adopt a tank structure. The bottom end of the silicon powder storage container 1 is provided with a discharge port 11. The silicon powder collection container 2 includes a feed port 21 and an exhaust port 22. The discharge port 11 of the silicon powder storage container 1 and the feed port 21 of the silicon powder collection container 2 can be selectively connected on and off. The powder exhaust filtration unit includes a silicon powder filter 3 and a vacuum dust collector 4. The silicon powder filter 3 is connected to the exhaust port 22 of the silicon powder collection container 2, and the vacuum dust collector 4 is connected to the silicon powder filter 3. The vacuum dust collector 4 is used to provide negative pressure to the silicon powder filter 3 and the silicon powder collection container 2.
[0031] In one embodiment, see Figure 1 As shown, the device includes a powder discharge pipeline 51 and a first shut-off valve 52. The discharge port 11 of the silicon powder storage container 1 is connected to the feed port 21 of the silicon powder collection container 2 through the powder discharge pipeline 51. The first shut-off valve 52 is provided on the powder discharge pipeline 51. The first shut-off valve 52 is used to control the on and off of the powder discharge pipeline 51.
[0032] In one embodiment, see Figure 1 As shown, two first shut-off valves 52 may be provided. The two first shut-off valves 52 can ensure that the powder discharge pipeline 51 is stably and reliably shut off when powder is not discharged.
[0033] In one embodiment, see Figure 1 As shown, the device includes a flow control valve 53, and the powder discharge pipeline 51 is provided with a flow control valve 53. The flow control valve 53 is used to control the flow rate of the powder discharged in the powder discharge pipeline 51.
[0034] In one embodiment, two first shut-off valves 52 are provided between the silicon powder storage container 1 and the flow control valve 53 .
[0035] In one embodiment, see Figure 1 As shown, the flow control valve 53 is a pneumatic control valve. In a specific embodiment, the flow control valve 53 is a pneumatic actuator with a model number of CTEN0-A-270DA+SD-5+LT produced by Wuxi Chengtiannuo Actuator Manufacturing Co., Ltd.
[0036] In one embodiment, see Figure 1 As shown, the device includes a control box 54 for controlling the opening of the pneumatic control valve.
[0037] The control box 54 can be a control box with a handle, combined with Figure 1In a specific embodiment, the handle of the control box 54 has a return position N, an increase opening adjustment position A, and a decrease opening adjustment position B. The handle is in the return position N when no force is applied. When an external force acts on the handle to move it from the return position N toward the increase opening adjustment position A, the opening of the pneumatic control valve increases. When the external force is removed, the handle automatically returns to the return position N. The opening of the pneumatic control valve increases by 5% with each fluctuation. Similarly, when an external force acts on the handle to move it from the return position N toward the decrease opening adjustment position B, the opening of the pneumatic control valve decreases. When the external force is removed, the handle automatically returns to the return position N. The opening of the pneumatic control valve decreases by 5% with each fluctuation. More specifically, a pneumatic control valve with an opening scale display can be selected to facilitate opening adjustment.
[0038] Since the control box 54 controls the opening of the pneumatic control valve, which belongs to the prior art and its structure itself is not the main invention of this application, it will not be described here in detail.
[0039] In one embodiment, see Figure 1 As shown, the device includes an exhaust line 61 , and the silicon powder filter 3 is connected to the exhaust port 22 of the silicon powder collecting container 2 through the exhaust line 61 .
[0040] In one embodiment, see Figure 1 As shown, the device includes a pressure gauge 62 connected to the exhaust line 61.
[0041] In one embodiment, see Figure 1 As shown, the device includes a second shut-off valve 63 , which is provided on the exhaust line 61 .
[0042] In one embodiment, see Figure 1 As shown, the silicon powder collection container 2 is a silicon powder collection bag, comprising a main bag cavity 23, an upper bag cavity 24 that is directly connected to the main bag cavity 23 and has a smaller cross-section than the main bag cavity 23, and a powder inlet sleeve 25. The powder inlet sleeve 25 has a top opening and a bottom opening 26. The bottom opening 26 of the powder inlet sleeve 25 is located in the main bag cavity 23, and the top opening of the powder inlet sleeve 25 extends upwardly out of the upper bag cavity 24 to serve as the feed port 21 of the silicon powder collection container 2. The exhaust port 22 of the silicon powder collection container 2 is provided on the side wall of the upper bag cavity 24.
[0043] In this embodiment, during powder discharge, the silicon powder in the powder discharge pipeline 51 enters through the top opening of the powder inlet sleeve 25 and flows out through the bottom opening 26 of the powder inlet sleeve 25 into the bag main chamber 23. The gas in the bag main chamber 23 and the raised silicon powder mix and then flow out through the exhaust port 22 on the side wall of the bag upper chamber 24 to the exhaust pipeline 61. Because the cross-section of the bag upper chamber 24 is smaller than that of the bag main chamber 23, most of the raised silicon powder is stopped by the inner wall of the top of the bag main chamber 23 and does not escape directly from the exhaust port 22 with the gas, thereby reducing silicon powder waste.
[0044] It should be understood that a vent line 7 may be connected to the vent port of the vacuum dust collector 4 .
[0045] Taking the flow control valve 53 as a pneumatic control valve and the silicon powder collecting container 2 as a silicon powder collecting bag as an example, Figure 1 The powder discharge process of the automatic silicon powder discharge device disclosed in one embodiment of the present utility model is described.
[0046] First, depressurize the silicon powder storage container 1 to a slightly positive pressure. Open the vacuum dust collector 4, which controls the pressure within the silicon powder filter 3 and exhaust line 61 to -50 kPa. Use the pressure gauge 62 to monitor whether the pressure within the exhaust line 61 remains stable at -50 kPa. Open the two first shut-off valves 52 to direct the silicon powder to the pneumatic control valve.
[0047] Then, the feed port 21 of the silicon powder collecting container 2 is connected to the powder discharge pipeline 51, and the connection between the powder discharge pipeline 51 and the silicon powder collecting container 2 is sealed by spraying polyurethane to prevent environmental pollution during the powder discharge process.
[0048] Then, by operating the control box 54, the valve handle is rotated from the N position to the A position, and the pneumatic control valve is slowly opened to the required opening to slowly discharge the powder.
[0049] Then, when the pressure gauge 62 shows that the pressure in the exhaust line 61 increases, the valve handle is rotated from the N position to the B position by operating the control box 54, and the pneumatic control valve 3 is slowly closed to the required opening to prevent the system pressure from increasing due to excessive powder discharge and causing leakage.
[0050] Then, by continuing to control the vacuum dust collector 4, it is ensured that the system pressure is stable at -50kPa during the powder discharge process.
[0051] When the silicon powder collection bag reaches the target powder filling amount, the control box 54 is operated to rotate the valve handle from position B to position N to close the pneumatic control valve, thereby completing one bagging of silicon powder.
[0052] When silicon powder bagging is not required for a long time, the two first shut-off valves 52 are closed to ensure that the powder discharge pipeline 51 is shut off.
[0053] This utility model provides a concept and method for an overflow-proof automatic discharge device for granular silicon byproduct, silicon powder. There are many methods and approaches to implement this technical solution. The above is only a preferred embodiment of the utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the utility model, and such improvements and modifications should also be considered within the scope of protection of the utility model. Any components not specified in this embodiment may be implemented using existing technologies.
Claims
1. An overflow-proof automatic discharge device for granular silicon byproduct silicon powder, characterized in that: include: A silicon powder storage container (1) for storing silicon powder, comprising a discharge port (11); The silicon powder collecting container (2) comprises a feed port (21) and an exhaust port (22); the discharge port (11) of the silicon powder storage container (1) and the feed port (21) of the silicon powder collecting container (2) are selectively connected in an on-off manner; And a powder exhaust filtration unit, comprising a silicon powder filter (3) and a vacuum dust collector (4), wherein the silicon powder filter (3) is communicated with the exhaust port (22) of the silicon powder collection container (2), and the vacuum dust collector (4) is communicated with the silicon powder filter (3); the vacuum dust collector (4) is used to provide negative pressure to the silicon powder filter (3) and the silicon powder collection container (2).
2. The overflow-proof automatic discharge device for granular silicon byproduct silicon powder according to claim 1, characterized in that: The invention comprises a powder discharge pipeline (51) and a first shut-off valve (52); the discharge port (11) of the silicon powder storage container (1) is connected to the feed port (21) of the silicon powder collection container (2) via the powder discharge pipeline (51); the first shut-off valve (52) is provided on the powder discharge pipeline (51); and the first shut-off valve (52) is used to control the on-off of the powder discharge pipeline (51).
3. The overflow-proof automatic discharge device for granular silicon byproduct silicon powder according to claim 2, characterized in that: It comprises a flow control valve (53), and the powder discharge pipeline (51) is provided with the flow control valve (53).
4. The overflow-proof automatic discharge device for granular silicon byproduct silicon powder according to claim 3, characterized in that: The flow control valve (53) is a pneumatic control valve.
5. The overflow-proof automatic discharge device for granular silicon byproduct silicon powder according to claim 3, characterized in that: Two first shut-off valves (52) are provided.
6. The overflow-proof automatic discharge device for granular silicon byproduct silicon powder according to claim 5, characterized in that: The two first shut-off valves (52) are arranged between the silicon powder storage container (1) and the flow control valve (53).
7. The overflow-proof automatic discharge device for granular silicon byproduct silicon powder according to claim 1, characterized in that: It comprises an exhaust pipeline (61), and the silicon powder filter (3) is connected to the exhaust port (22) of the silicon powder collecting container (2) through the exhaust pipeline (61).
8. The overflow-proof automatic discharge device for granular silicon byproduct silicon powder according to claim 7, characterized in that: A pressure gauge (62) is included, and the pressure gauge (62) is connected to the exhaust line (61).
9. The overflow-proof automatic discharge device for granular silicon byproduct silicon powder according to claim 7, characterized in that: A second shut-off valve (63) is included, and the second shut-off valve (63) is arranged on the exhaust line (61).
10. The overflow-proof automatic discharge device for granular silicon byproduct silicon powder according to claim 1, characterized in that: The silicon powder collection container (2) is a silicon powder collection bag, comprising a bag main cavity (23), a bag upper cavity (24) directly connected to the bag main cavity (23), and a powder inlet sleeve (25), wherein the powder inlet sleeve (25) is provided with a top opening and a bottom opening (26), wherein the bottom opening (26) of the powder inlet sleeve (25) is located in the bag main cavity (23), and the top opening of the powder inlet sleeve (25) passes upward out of the bag upper cavity (24) to serve as a feed port (21) of the silicon powder collection container (2); and the exhaust port (22) of the silicon powder collection container (2) is provided on the side wall of the bag upper cavity (24).