Protection device and reactor for polycrystalline silicon cold hydrogenation
By using multiple switching and detection components in the polycrystalline silicon cold hydrogenation protection device, the problems of poor sealing and safety hazards between the silicon powder receiving tank and the feeding tank were solved, and the airtightness and safety between the tanks were improved.
Patent Information
- Application Number
- CN202423072718.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-12-12
AI Technical Summary
In polysilicon production, there are problems with poor sealing and significant safety hazards between silicon powder receiving tanks and silicon powder feeding tanks.
A polycrystalline silicon cold hydrogenation protection device is adopted, including a first tank, a second tank, a connecting pipe, and multiple switching components. By setting multiple switching components and detection components, the airtightness and safety between the tanks are ensured, and the connecting pipe is used to guide hydrogen to the rinsing components to reduce safety hazards.
It improves the airtightness between tanks, reduces the frequency of poor sealing, enhances safety performance, and reduces safety hazards.
Smart Images
Figure CN223570675U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of polysilicon production technology, and in particular to a protective device and reactor for the cold hydrogenation of polysilicon. Background Technology
[0002] Cold hydrogenation technology is an important process in polycrystalline silicon production. Silicon powder and hydrogen chloride undergo a hydrogenation reaction under the action of a catalyst to produce intermediate products such as trichlorosilane and silicon tetrachloride. The intermediate products then undergo a reduction reaction with hydrogen in a reduction furnace to obtain polycrystalline silicon.
[0003] The fluidized bed reactor is the core equipment of cold hydrogenation technology. The silicon powder in the fluidized bed is continuously consumed, so it needs to be continuously replenished into the fluidized bed by the silicon powder feed tank, and the silicon powder receiving tank needs to be used to replenish the silicon powder in the silicon powder feed tank.
[0004] In related technologies, as fluidized bed reactors operate for extended periods, issues arise between the silicon powder receiving tank and the silicon powder feeding tank, leading to problems such as inadequate sealing and significant safety hazards. Utility Model Content
[0005] This application provides a protective device and reactor for the cold hydrogenation of polysilicon, which solves the problems of poor sealing and significant safety hazards between the silicon powder receiving tank and the silicon powder feeding tank.
[0006] On one hand, this application provides a protection device for the cold hydrogenation of polycrystalline silicon, comprising:
[0007] The first tank is used to contain silicon powder and hydrogen gas;
[0008] The second tank is used to contain silicon powder;
[0009] The first connecting pipe has one end connected to the first tank and the other end connected to the second tank.
[0010] At least one first switching element is disposed on the first connecting pipe;
[0011] At least one second switch is disposed on the first connecting pipe. Along the extension direction of the first connecting pipe, the first switch and the second switch are disposed at intervals, and the first switch is located on the side of the second switch away from the second tank body.
[0012] The second connecting pipe is connected to the first connecting pipe, and the first switch, the second connecting pipe and the second switch are arranged adjacent to each other along the extension direction of the first connecting pipe.
[0013] The first switch is used to open or close the connection between the first tank and the second connecting pipe.
[0014] In one feasible implementation, the second connecting pipe is used to connect an external rinsing assembly. When the first switch opens the connection between the first tank and the second connecting pipe, the first tank is connected to the rinsing assembly through the second connecting pipe.
[0015] In one feasible implementation, it further includes:
[0016] The first detection element is installed on the second connecting pipe and is used to detect the internal pressure of the second connecting pipe.
[0017] In one feasible implementation, it further includes:
[0018] The second detection element is installed on the second tank body and is used to detect the internal pressure of the second tank body.
[0019] In one feasible implementation, it further includes:
[0020] The third switch is mounted on the second connecting pipe, and the first detection element is located at the end of the third switch that is furthest from the first tank.
[0021] In one feasible implementation, multiple first switching elements are provided, and the multiple first switching elements are arranged sequentially at intervals along the extension direction of the first connecting pipe.
[0022] In one feasible implementation, the side of the first tank facing away from the second tank is used for connecting an external reactor.
[0023] In one feasible implementation, it further includes:
[0024] The fourth switch is located on the second connecting pipe and is used to open or close the connection between the first tank and the rinsing assembly.
[0025] In one feasible implementation, it further includes:
[0026] The fifth switch is located on the second tank and is used to open or close the connection between the second tank and the second detection element.
[0027] On the other hand, this application provides a reactor including a protective device for the cold hydrogenation of polycrystalline silicon.
[0028] In a protective device for the cold hydrogenation of polycrystalline silicon provided in an embodiment of this application, a first tank is connected to a next process to transport silicon powder in the first tank to the next process; a second tank is connected to the first tank via a first connecting pipe to transport silicon powder in the second tank to the first tank after passing through the first connecting pipe, thereby replenishing the silicon powder in the first tank; a first switch and a second switch are used to open or close the connection between the second tank and the first tank; the second connecting pipe is used to guide hydrogen in the first tank to the rinsing assembly in the event of wear of the first switch, thereby reducing the safety hazard between the first tank and the second tank; increasing the number of the first switch and the second switch can improve the airtightness between the first tank and the second tank, thereby reducing the occurrence of poor sealing between the first tank and the second tank, and improving the safety performance between the first tank and the second tank.
[0029] Therefore, the embodiments of this application provide a protection device for the cold hydrogenation of polycrystalline silicon, which can solve the problems of poor sealing and significant safety hazards between the silicon powder receiving tank and the silicon powder feeding tank. Attached Figure Description
[0030] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.
[0031] Figure 1 A schematic diagram of the main structure of a protection device for cold hydrogenation of polycrystalline silicon provided for embodiments of this application;
[0032] Figure 2 A schematic diagram of the connection structure of the protection device and reactor for the cold hydrogenation of polycrystalline silicon provided in the embodiments of this application.
[0033] Explanation of reference numerals in the attached figures:
[0034] 10-Reactor;
[0035] 100 - First tank;
[0036] 200 - Second tank;
[0037] 300 - First connecting pipe;
[0038] 400 - First switch element;
[0039] 500 - Second switch;
[0040] 600 - Second connecting pipe;
[0041] 700 - First inspection component; 701 - Third switch component;
[0042] 800 - Second inspection component; 801 - Fifth switch component;
[0043] 900 - Fourth switch.
[0044] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation
[0045] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below. The specific embodiments listed below are merely descriptions of the principles and features of the present invention, and the examples are only used to explain the present invention and are not intended to limit its scope. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.
[0046] Hydrogen, silicon powder, and silicon tetrachloride react in a fluidized bed at a preset temperature and pressure. The silicon powder in the fluidized bed is continuously consumed, so silicon powder needs to be continuously replenished into the fluidized bed by a silicon powder feeder. The internal pressure of the silicon powder feeder is greater than the pressure of the fluidized bed, which causes the silicon powder to flow into the fluidized bed under the action of the internal pressure.
[0047] In related technologies, a silicon powder receiving tank is installed above the silicon powder feeding tank. The silicon powder in the receiving tank is added manually through the discharge port or by gas conveying. A switch valve is installed between the silicon powder receiving tank and the silicon powder feeding tank to open or close the connection between them.
[0048] It should be noted that when the connection between the silicon powder receiving tank and the silicon powder feeding tank is closed by the switch valve, the internal pressure of the silicon powder receiving tank is less than that of the silicon powder feeding tank, and the silicon powder feeding tank is filled with hydrogen gas.
[0049] When the silicon powder in the silicon powder feeder is used up, the silicon powder feeder is depressurized so that the internal pressure of the silicon powder receiving tank is greater than that of the silicon powder feeder. Then, the switching valve opens the connection between the silicon powder receiving tank and the silicon powder feeder. The silicon powder in the silicon powder receiving tank will move towards the side closer to the silicon powder feeder under the action of the internal pressure of the silicon powder receiving tank and enter the silicon powder feeder.
[0050] However, due to the high hardness of silicon powder, prolonged operation can cause wear on the switching valve, leading to poor sealing. This can cause hydrogen gas in the silicon powder feeding tank to pass through the switching valve and enter the silicon powder receiving tank, causing the internal pressure of the silicon powder receiving tank to rise. If silicon powder is added at this time, oxygen will enter the silicon powder receiving tank, posing a risk of flash explosion and increasing the safety hazard.
[0051] In the protective device for cold hydrogenation of polycrystalline silicon provided in the embodiments of this application, a first tank is used to connect to the next process to transport silicon powder in the first tank to the next process; a second tank is connected to the first tank through a first connecting pipe to transport silicon powder in the second tank to the first tank after passing through the first connecting pipe, thereby replenishing the silicon powder in the first tank; a first switch and a second switch are used to open or close the connection between the second tank and the first tank; the second connecting pipe is used to guide hydrogen in the first tank to the rinsing assembly in the event of wear of the first switch, thereby reducing the safety hazards between the first tank and the second tank; increasing the number of the first switch and the second switch can improve the airtightness between the first tank and the second tank, thereby reducing the occurrence of poor sealing between the first tank and the second tank, and improving the safety performance between the first tank and the second tank.
[0052] like Figure 1 As shown, the protection device for cold hydrogenation of polycrystalline silicon provided in the embodiments of this application includes: a first tank 100, a second tank 200, a first connecting pipe 300, at least one first switch 400, at least one second switch 500, and a second connecting pipe 600. The first tank 100 is used to contain silicon powder and hydrogen, and the second tank 200 is used to contain silicon powder. One end of the first connecting pipe 300 is connected to the first tank 100, and the other end of the first connecting pipe 300 is connected to the second tank 200. A first switch 400 and a second switch 500 are disposed on the first connecting pipe 300. The first switch 400 and the second switch 500 are spaced apart along the extension direction of the first connecting pipe 300, and the first switch 400 is located on the side of the second switch 500 away from the second tank 200. The second connecting pipe 600 is connected to the first connecting pipe 300. The first switch 400, the second connecting pipe 600, and the second switch 500 are adjacent to each other along the extension direction of the first connecting pipe 300. The first switch 400 is used to open or close the connection between the first tank 100 and the second connecting pipe 600.
[0053] It should be noted that the first switch 400 has several different configuration methods, and the configuration methods of the first switch 400 will be illustrated below.
[0054] In one feasible implementation, the first switching element 400 is a first disc valve.
[0055] In another feasible implementation, the first switching element 400 is a first ball valve.
[0056] Understandably, there are no restrictions on the specific configuration of the first switch 400; it can be selected according to actual usage requirements.
[0057] It should be noted that the second switch 500 has several different configuration methods, and the configuration methods of the second switch 500 will be illustrated below.
[0058] In one feasible implementation, the second switching element 500 is a second disc valve.
[0059] In another feasible implementation, the second switching element 500 is a second ball valve.
[0060] Understandably, there are no restrictions on the specific configuration of the second switch 500; it can be selected according to actual usage requirements.
[0061] It should be noted that the second connecting pipe 600 is used to connect an external rinsing assembly. When the first switch 400 opens the connection between the first tank 100 and the second connecting pipe 600, the first tank 100 is connected to the rinsing assembly through the second connecting pipe 600.
[0062] Understandably, the second connecting pipe 600 is used to transfer the pressure inside the first tank 100 to the washing assembly when the first tank 100 is depressurized, thereby reducing the risk of environmental pollution caused by the first tank 100 depressurizing to the external environment. In the event of wear on the first switch 400, the pressure inside the first tank 100 will be transferred to the washing assembly through the second connecting pipe 600, reducing the pressure increase in the first connecting pipe 300 and thus reducing wear on the second switch 500. This extends the service life of the second switch 500 and improves the sealing stability between the first tank 100 and the second tank 200, thereby reducing potential safety hazards between the two tanks.
[0063] The protective device for cold hydrogenation of polycrystalline silicon provided in the embodiments of this application further includes: a first detection element 700, which is disposed on the second connecting pipe 600 and is used to detect the internal pressure of the second connecting pipe 600.
[0064] Understandably, the first detection element 700 is used to measure the internal air pressure of the second connecting pipe 600. When the first switch element 400 opens the connection between the first tank 100 and the second connecting pipe 600, the first detection element 700 can measure the internal air pressure of the second connecting pipe 600 and compare it with a preset air pressure value to determine whether the air pressure inside the first tank 100 is leaking into the second connecting pipe 600. If the air pressure detected by the first detection element 700 is greater than or equal to the preset air pressure value, it can remind the operator to inspect the first switch element 400. When the first switch element 400 closes the connection between the first tank 100 and the second connecting pipe 600, the first detection element 700 can measure the internal air pressure of the second connecting pipe 600. The operator can compare the measured air pressure value with the preset air pressure value. If the measured air pressure value is greater than the preset air pressure value, the first switch element 400 is worn, which can serve as a reminder to replace or repair the first switch element 400.
[0065] It should be noted that the first detection element 700 has several different settings, and the following examples illustrate the settings of the first detection element 700.
[0066] In one feasible implementation, the first detection element 700 is a first remote pressure transmitter.
[0067] In another feasible implementation, the first detection element 700 is a first pneumatic solenoid valve.
[0068] Understandably, there are no restrictions on the specific settings of the first testing component 700; it can be selected according to actual usage requirements.
[0069] The protective device for cold hydrogenation of polycrystalline silicon provided in the embodiments of this application further includes: a second detection element 800, which is disposed on the second tank 200 and is used to detect the internal pressure of the second tank 200.
[0070] Understandably, the second detection element 800 allows operators to easily monitor the internal pressure of the second tank 200. Furthermore, by simultaneously setting the first detection element 700 and the second detection element 800, when the first switch 400 opens the connection between the first tank 100 and the second connecting pipe 600, the difference between the second detection element 800 and the first detection element 700 can be observed. If the difference is greater than or equal to a preset difference, the depressurization of the first tank 100 is complete, offering the advantage of simple operation.
[0071] It should be noted that the second detection element 800 has several different settings, and the following examples illustrate the settings of the second detection element 800.
[0072] In one feasible implementation, the second detection element 800 is a second remote pressure transmitter.
[0073] In another feasible implementation, the second detection element 800 is a second pneumatic solenoid valve.
[0074] Understandably, there are no restrictions on the specific settings of the second detection component 800; it can be selected according to actual usage requirements.
[0075] The protective device for cold hydrogenation of polycrystalline silicon provided in the embodiments of this application further includes: a third switch 701 disposed on the second connecting pipe 600, and a first detection element 700 located at the end of the third switch 701 away from the first tank 100.
[0076] Understandably, the third switch 701 is used to open or close the connection between the first detection element 700 and the second connecting pipe 600. When the third switch 701 closes the connection between the first detection element 700 and the second connecting pipe 600, the third switch 701 can prevent the silicon powder and hydrogen gas in the second connecting pipe 600 from moving towards the side closer to the first detection element 700, so as to protect the first detection element 700 and extend the service life of the first detection element 700.
[0077] It should be noted that the third switch 701 has several different configuration methods, and the configuration methods of the third switch 701 will be illustrated below.
[0078] In one feasible implementation, the third switching element 701 is a third shut-off valve.
[0079] In another feasible implementation, the third switching element 701 is a third ball valve.
[0080] Understandably, there are no restrictions on the specific configuration of the third switch 701, and it can be selected according to actual usage requirements.
[0081] The embodiments of this application provide a plurality of first switching elements 400, which are arranged sequentially at intervals along the extension direction of the first connecting pipe 300.
[0082] It is understandable that increasing the number of first switch components 400 can improve the connection stability and airtightness between the first tank 100 and the second tank 200, and can reduce the occurrence of hydrogen in the first tank 100 moving towards the second tank 200, so as to protect the safety of the operators.
[0083] It should be noted that the first switch 400 has a variety of different configurations, and the configurations of the first switch 400 will be illustrated below with examples.
[0084] In one feasible implementation, the first switch 400 is provided with one.
[0085] Understandably, a first switch 400 is used to open or close the connection between the first tank 100 and the first connecting pipe 300.
[0086] In another feasible implementation, two first switching elements 400 are provided.
[0087] Understandably, the two first switching components 400 are used to open or close the connection between the first tank 100 and the first connecting pipe 300, and can reduce the wear of the first switching components 400 by the silicon powder in the first tank 100, thereby improving the airtightness and safety of the first tank 100, and can also provide safety protection for the second tank 200.
[0088] Understandably, there is no limit to the number of first switch components 400 that can be installed; they can be selected according to actual usage requirements.
[0089] like Figure 2 As shown, the side of the first tank 100 opposite to the second tank 200 provided in the embodiment of this application is used to connect an external reactor 10.
[0090] It should be noted that the internal pressure of the first tank 100 is greater than the internal pressure of the reactor 10.
[0091] Understandably, the silicon powder and hydrogen in the first tank 100 can be moved toward the side closer to the reactor 10 under the pressure inside the first tank 100, so as to complete the addition of silicon powder and hydrogen in the reactor 10, which has the advantage of being easy to add.
[0092] The protective device for cold hydrogenation of polycrystalline silicon provided in the embodiments of this application further includes: a fourth switch 900, which is disposed on the second connecting pipe 600 and is used to open or close the connection between the first tank 100 and the rinsing assembly.
[0093] Understandably, when the fourth switch 900 opens the connection between the first tank 100 and the rinsing assembly, the silicon powder or hydrogen in the first tank 100 can be depressurized to the rinsing assembly. After the first tank 100 is depressurized, the fourth switch 900 closes the connection between the first tank 100 and the rinsing assembly, thereby facilitating the adjustment of the internal pressure or internal stress in the first tank 100 and improving the conveying efficiency of the second tank 200 towards the first tank 100 after passing through the first connecting pipe 300.
[0094] It should be noted that the fourth switch 900 has several different configuration methods, and the configuration methods of the fourth switch 900 will be illustrated with examples below.
[0095] In one possible implementation, the fourth switching element 900 is a fourth shut-off valve.
[0096] In another feasible implementation, the fourth switching element 900 is a fourth ball valve.
[0097] Understandably, there are no restrictions on the specific configuration of the fourth switch 900; it can be selected according to actual usage requirements.
[0098] The protective device for cold hydrogenation of polycrystalline silicon provided in the embodiments of this application further includes: a fifth switch 801, which is disposed on the second tank 200 and is used to open or close the connection between the second tank 200 and the second detection element 800.
[0099] Understandably, the fifth switch 801 is used to open or close the connection between the second tank 200 and the second detection element 800. When the fifth switch 801 closes the connection between the second tank 200 and the second detection element 800, the fifth switch 801 prevents the gas pressure inside the second tank 200 from moving towards the side closer to the second detection element 800. This facilitates the repair and replacement of the second detection element 800 in case of a malfunction, thereby improving the safety performance of the protection device used for polycrystalline silicon cold hydrogenation.
[0100] It should be noted that the fifth switch 801 has several different configuration methods, and the configuration methods of the fifth switch 801 will be illustrated below.
[0101] In one feasible implementation, the fifth switching element 801 is a fifth shut-off valve.
[0102] In another feasible implementation, the fifth switching element 801 is a fifth ball valve.
[0103] It is understandable that there are no restrictions on the specific configuration of the fifth switch 801, and it can be selected according to actual usage requirements.
[0104] Embodiments of this application provide a reactor, including a protection device for the cold hydrogenation of polycrystalline silicon provided in the above embodiments.
[0105] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.
[0106] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.
Claims
1. A protection device for the cold hydrogenation of polycrystalline silicon, characterized in that, include: The first tank (100) is used to contain silicon powder and hydrogen gas; The second tank (200) is used to contain silicon powder; A first connecting pipe (300) is connected at one end to the first tank (100) and at the other end to the second tank (200). At least one first switching element (400) is disposed on the first connecting pipe (300); At least one second switch (500) is disposed on the first connecting pipe (300). Along the extension direction of the first connecting pipe (300), the first switch (400) and the second switch (500) are spaced apart. The first switch (400) is located on the side of the second switch (500) away from the second tank (200). The second connecting pipe (600) is connected to the first connecting pipe (300). Along the extension direction of the first connecting pipe (300), the first switch (400), the second connecting pipe (600) and the second switch (500) are arranged adjacent to each other. The first switch (400) is used to open or close the connection between the first tank (100) and the second connecting pipe (600).
2. The protection device for cold hydrogenation of polycrystalline silicon according to claim 1, characterized in that, The second connecting pipe (600) is used to connect an external rinsing assembly. When the first switch (400) opens the connection between the first tank (100) and the second connecting pipe (600), the first tank (100) is connected to the rinsing assembly through the second connecting pipe (600).
3. The protection device for cold hydrogenation of polycrystalline silicon according to claim 2, characterized in that, Also includes: A first detection element (700) is disposed on the second connecting pipe (600), and the first detection element (700) is used to detect the internal pressure of the second connecting pipe (600).
4. A protection device for the cold hydrogenation of polycrystalline silicon according to claim 3, characterized in that, Also includes: A second detection element (800) is disposed on the second tank (200) and is used to detect the internal pressure of the second tank (200).
5. A protection device for the cold hydrogenation of polycrystalline silicon according to claim 4, characterized in that, Also includes: The third switch (701) is disposed on the second connecting pipe (600), and the first detection element (700) is located at the end of the third switch (701) away from the first tank (100).
6. A protective device for the cold hydrogenation of polycrystalline silicon according to any one of claims 1-5, characterized in that, Multiple first switching elements (400) are provided, and multiple first switching elements (400) are arranged at intervals along the extension direction of the first connecting pipe (300).
7. A protective device for the cold hydrogenation of polycrystalline silicon according to any one of claims 1-5, characterized in that, The side of the first tank (100) facing away from the second tank (200) is used for connecting an external reactor.
8. A protection device for the cold hydrogenation of polycrystalline silicon according to claim 3, characterized in that, Also includes: A fourth switch (900) is disposed on the second connecting pipe (600), and the fourth switch (900) is used to open or close the connection between the first tank (100) and the rinsing assembly.
9. A protection device for the cold hydrogenation of polycrystalline silicon according to claim 4, characterized in that, Also includes: A fifth switch (801) is disposed on the second tank (200), and the fifth switch (801) is used to open or close the connection between the second tank (200) and the second detection element (800).
10. A reactor, characterized in that, Includes a protective device for cold hydrogenation of polycrystalline silicon according to any one of claims 1-9.