Fluidized bed feeding and discharging device beneficial to silicon powder recovery
By improving the design of the fluidized bed feed and discharge device, and adopting a combination of main feed inlet, auxiliary air inlet and side air inlet pipe, the problem of easy agglomeration of silicon powder under high temperature conditions was solved, and uniform distribution and efficient recovery of silicon powder were achieved, thereby improving production efficiency.
Patent Information
- Application Number
- CN202423315911.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2034-12-31
AI Technical Summary
In existing fluidized bed reactors, silicon powder tends to agglomerate into clumps under high-temperature conditions, causing blockage of the gas distributor, affecting silicon powder recovery efficiency, and making cleaning difficult.
The design combines a main feed inlet and an auxiliary air inlet, along with a side air inlet and a backflush air inlet, eliminating the need for a traditional gas distribution plate and achieving uniform distribution and recovery of silicon powder within the fluidized bed.
It effectively prevents silicon powder agglomeration, improves silicon powder recovery efficiency, reduces downtime, and enhances production efficiency.
Smart Images
Figure CN223717088U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to organic silicon synthesis device technical field, concretely relates to a fluidized bed feeding and discharging device beneficial to silicon powder recovery. BACKGROUND
[0002] Organic silicon monomer synthesis usually adopts fluidized bed reactor, but currently domestic fluidized bed reactor still has certain inconvenience in the structure design of silicon powder recovery, and urgently needs to be optimized. In the organic silicon monomer synthesis reaction, the fluidized bed reactor usually adopts the bed layer structure of cylindrical or the combination of cone and cylinder, and is provided with a gas distributor at the bottom, and the common one is the conical sieve plate type gas distributor. Although this design can meet the gas distribution demand of the fluidized bed under the conventional working condition, but there is certain limitation in the organic silicon monomer synthesis reaction under the high temperature condition. In the reaction, the raw material gas methyl chloride and the by-product generated in the reaction will pyrolyze and carbonize under the high temperature, form carbonaceous deposits, and these deposits will combine with the silicon powder particles, cause the silicon powder to agglomerate into blocks.
[0003] In the actual production process, when stopping and treating, through the equipment detection and silicon powder recovery work, it is found that these agglomerated blocks will block the air holes on the gas distributor, and the silicon powder that is not completely reacted cannot be smoothly recovered through the air holes in the distribution plate, and the accumulation of the silicon powder, copper powder and other materials on the distribution plate also becomes a cleaning problem. A large amount of production time is wasted in cleaning the blockage and accumulation, and further influences the recovery efficiency. Therefore, a new design needs to be developed, which can cancel the traditional gas distribution plate, optimize the silicon powder recovery device, reduce the blockage problem during stopping, and thus improve the recovery efficiency of the organic silicon synthesis raw material. CONTENT OF THE UTILITY MODEL
[0004] The utility model provides a fluidized bed feeding and discharging device beneficial to silicon powder recovery, changes the feed inlet from the original one feed inlet to the combination of main air inlet and auxiliary air inlet, blows and scatters the material through the air inlet of auxiliary air inlet, uses the air inlet of auxiliary air inlet as fluidization gas, and cooperates with the lateral air inlet pipe of side wall, so that the silicon powder is evenly distributed in the lower cone, to replace the original distributor device.
[0005] The utility model realizes the following technical scheme:
[0006] A fluidized bed feeding and discharging device beneficial to silicon powder recovery, including the feeding and discharging device of fluidized bed bottom, the feeding and discharging device is set up in the conical body, the bottom of feeding and discharging device is provided with main feed inlet, air inlet auxiliary mouth, the air inlet auxiliary mouth is set up above the main feed inlet, and is provided with a plurality of and is along the main feed inlet circle even setting, is provided with lateral air inlet pipe above the air inlet auxiliary mouth, the lateral air inlet pipe is provided with a plurality of horizontal oblique and inserts the feeding and discharging device.
[0007] Further, the inlet and outlet device is further provided with a back-blowing air inlet pipe, the back-blowing air inlet pipe is arranged above the lateral air inlet pipe and is inserted into the inlet and outlet device obliquely downwards.
[0008] Further, the direction of the back-blowing air inlet pipe of the inlet and outlet device is opposite to the direction of the lateral air inlet pipe inserted into the inlet and outlet device.
[0009] Further, the taper angle of the inlet and outlet device is 30°-70°.
[0010] Further, the air inlet auxiliary port is located in the circle formed by the vertical projection of the air outlet of the lateral air inlet pipe
[0011] The utility model discloses beneficial effect lies in,
[0012] I, the inlet and outlet device is arranged as a cone structure, a plurality of air inlet auxiliary ports are arranged on the main inlet by arranging a main inlet. The main inlet is the inlet of chloromethane and is also used for taking the silicon powder into the fluidized bed reactor by chloromethane, and the air inlet auxiliary port and the main inlet ensure that the chloromethane gas is uniformly distributed in the fluidized bed in the radial direction.
[0013] II, in order to effectively control the adhesion of the unreacted silicon powder to the cylinder wall, reduce the accumulation of the silicon powder and improve the production efficiency of the reactor, the back-blowing air inlet pipe is further arranged above the lateral air inlet pipe of the inlet and outlet device, and the unreacted raw materials adhered to the cylinder wall can be controlled to enter the reaction zone by the reverse oblique blowing, and the materials hung on the inlet and outlet device can be effectively blown off during shutdown, thereby improving the recovery effect.
[0014] III, in order to improve the gas control effect of the back-blowing air inlet pipe, the back-blowing air inlet pipe is opposite to the insertion direction of the lateral air inlet pipe. DRAWINGS
[0015] The drawings are used to provide further understanding of the utility model and constitute a part of the specification, are used to explain the utility model together with the embodiments of the utility model and do not constitute the limitation to the utility model. In the drawings:
[0016] Figure 1 It is the structure schematic diagram of the utility model.
[0017] Figure 2 It is the overhead structure schematic diagram of the utility model. CONCRETE IMPLEMENTING METHOD
[0018] The preferred embodiments of the utility model are described below in combination with the drawings, and it should be understood that the preferred embodiments described here are only used to illustrate and explain the utility model and are not used to limit the utility model.
[0019] As Figures 1-2As shown, a fluidized bed inlet and outlet device for facilitating silicon powder recovery, comprising a fluidized bed bottom inlet and outlet device 10, the inlet and outlet device 10 is arranged in a cone shape, the bottom of the inlet and outlet device 10 is provided with a main inlet port 101, an auxiliary inlet port 102, the auxiliary inlet port 102 is arranged above the main inlet port 101, and is provided with a plurality of and arranged uniformly along the circumference of the main inlet port 101, and a lateral inlet pipe 103 is arranged above the auxiliary inlet port 102, the lateral inlet pipe 103 is provided with a plurality of horizontal oblique insertion into the inlet and outlet device 10.
[0020] Further, the inlet and outlet device 10 is also provided with a backblowing inlet pipe 104, the backblowing inlet pipe 104 is arranged above the lateral inlet pipe 103 and obliquely downward into the inlet and outlet device 10.
[0021] Further, the direction of the backblowing inlet pipe 104 into the inlet and outlet device 10 is opposite to the direction of the lateral inlet pipe 103 into the inlet and outlet device 10.
[0022] Further, the cone angle of the inlet and outlet device 10 is 30°~70°.
[0023] Further, the auxiliary inlet port 102 is located within the circle formed by the vertical projection of the lateral inlet pipe 103 outlet.
[0024] Specifically, in use, the main inlet port 101 is both the inlet of chloromethane and the silicon powder is carried into the fluidized bed reactor by chloromethane, the auxiliary inlet port 102 and the main inlet port 101 ensure that the chloromethane gas is uniformly distributed in the radial direction in the fluidized bed, further ensuring that the silicon powder in the fluidized bed is in a fluidized state. A plurality of lateral inlet pipes 103 are arranged on the inlet and outlet device 10, the lateral inlet pipes 103 can be arranged as shown in the attached drawings, and the lateral inlet pipes 103 are arranged in the form of a plurality of horizontal oblique insertion into the inlet and outlet device 10. Figure 2As shown, the side wall of the lower cone is uniformly distributed along the circumferential direction for the cyclone injection of the feed chloromethane gas in the fluidized bed, and the gas distribution plate in the fluidized bed can be cancelled due to the use of the feeding and discharging device 10. Through the combination of the main feeding port, the auxiliary gas inlet and the side blowing gas flow, the material is uniformly transported into the fluidized bed. In this way, the gas in the bed is more uniform, effectively ensuring the uniform fluidization in the fluidized bed reactor. During the shutdown of the fluidized bed, in order to effectively control the adhesion of the unreacted silicon powder to the lower vertebral cylinder wall and reduce the accumulation of silicon powder, improve the recovery efficiency of the reactor, a backblowing gas inlet pipe 104 is arranged above the lateral gas inlet pipe 103, and the backblowing gas inlet pipe 104 is inserted into the feeding and discharging device 10 obliquely downward, and the insertion direction is opposite to that of the lateral gas inlet pipe 103, and the insertion angle can be 35°, the selection range is 30°~60°, in order to reduce the waste of raw materials, the protective gas nitrogen in the fluidized bed is used as the raw material of the backblowing pipe, and the unreacted raw material adhered to the cylinder wall is blown off by the backblowing gas inlet pipe 104 to realize the full recovery of the silicon powder.
[0025] During the reaction process, as the silicon powder is continuously consumed, the diameter of the silicon powder particles will continuously decrease, and the surface tension of the particles will increase, and part of the silicon powder will be adsorbed on the side wall of the feeding and discharging device 10, when the periodic shutdown is carried out, due to the arrangement of the backblowing gas inlet pipe 104, during the shutdown, only the backblowing gas inlet pipe 104 needs to be opened to continue to run for a period of time, and the residual part of the silicon powder and copper powder on the side wall of the feeding and discharging device 10 can be blown away by the backblowing gas inlet pipe 104, thereby improving the recovery efficiency of the silicon powder and copper powder.
[0026] Finally, it should be noted that: the above only describes the preferred embodiments of the present application, and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. A fluidized bed in-out material device for facilitating silicon powder recovery, comprising a fluidized bed in-out material device (10) at the bottom of the fluidized bed, characterized in that, The inlet and outlet device (10) is arranged in a conical shape, the bottom of the inlet and outlet device (10) is provided with a main inlet (101) and an auxiliary air inlet (102), the auxiliary air inlet (102) is arranged above the main inlet (101) and is provided with a plurality of auxiliary air inlets which are uniformly arranged along the circumference of the main inlet (101), a lateral air inlet pipe (103) is further arranged above the auxiliary air inlets (102), and the lateral air inlet pipe (103) is provided with a plurality of horizontal inclined pipes which are inserted into the inlet and outlet device (10).
2. The fluidized bed in-and-out feed device for facilitating silicon powder recovery according to claim 1, wherein, The inlet and outlet device (10) is further provided with a back-blowing air inlet pipe (104), the back-blowing air inlet pipe (104) is arranged above the lateral air inlet pipe (103) and is inserted into the inlet and outlet device (10) in an inclined downward direction.
3. The fluidized bed in-and-out feed device for facilitating silicon powder recovery according to claim 2, wherein, The direction of the back-blowing air inlet pipe (104) and the inlet and outlet device (10) is opposite to the direction of the lateral air inlet pipe (103) and the inlet and outlet device (10).
4. The fluidized bed in-out feed device for facilitating silicon powder recovery according to claim 1, wherein, The conical angle of the inlet and outlet device (10) is 30°-70°.
5. The fluidized bed in-out feed device for facilitating silicon powder recovery according to claim 1, wherein, The auxiliary air inlets (102) are located within the circle formed by the vertical projection of the air outlet of the lateral air inlet pipe (103).