Silicon powder pushing device of cold hydrogenation fluidized bed reactor

Abstract

The utility model discloses a silicon powder pushing device of a cold hydrogenation fluidized bed reactor. The silicon powder pushing device comprises the cold hydrogenation fluidized bed reactor, a silicon powder pushing pipeline and a silicon powder pushing disperser, the silicon powder pushing pipeline penetrates through the side wall of the cold hydrogenation fluidized bed reactor, the outer end of the silicon powder pushing pipeline is connected with an external silicon powder feeding mechanism, and the inner end of the silicon powder pushing pipeline is arranged in the cold hydrogenation fluidized bed reactor; the silicon powder pushing disperser comprises a metal ball and a metal rod, and the metal ball is welded to an outlet in the inner end of the silicon powder pushing pipeline through the metal rod. The metal balls have the effects of dispersing the silicon powder in time and maintaining stable fluidization. Static electricity is easily generated due to friction between the silicon powder and the metal ball of the pushing disperser, and can be eliminated through the static grounding module connected with the outer side of the metal rod.

Description

Technical Field

[0001] The utility model belongs to the field of polysilicon production, and particularly relates to a silicon powder feeding device for a cold hydrogeneration fluidized bed reactor. Background Art

[0002] The cold hydrogeneration process is an important step in the current production of crystalline silicon materials, and the cold hydrogeneration fluidized bed reactor is the core equipment of this process. The mixed gas of silicon tetrachloride and hydrogen is heated to a certain temperature and then enters the fluidized bed to fluidize industrial silicon powder for reaction to produce trichlorosilane. In the existing process, silicon powder mixed with a certain proportion of catalyst is intermittently supplemented into the fluidized bed through an inserted feeding pipeline to balance the reaction consumption. Supplying silicon powder through the inserted feeding pipeline is the current mainstream method, but the silicon powder cannot be evenly dispersed in the fluidized bed in time, which affects the fluidization of silicon powder and the product yield; if the silicon powder is too concentrated and not dispersed, it will even cause phenomena such as silicon powder bridging and bed dropping, affecting production. Summary of the Invention

[0003] Purpose of the utility model: The technical problem to be solved by the utility model is to provide a silicon powder feeding device aiming at the deficiencies of the existing technology, improve the feeding form of silicon powder, make it disperse well in time, reduce the influence of silicon powder feeding on the fluidization of the cold hydrogeneration fluidized bed, maintain stable fluidization, and extend the operation cycle.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A silicon powder feeding device for a cold hydrogeneration fluidized bed reactor includes a cold hydrogeneration fluidized bed reactor, a silicon powder feeding pipeline, and a silicon powder feeding disperser; the silicon powder feeding pipeline penetrates through the side wall of the cold hydrogeneration fluidized bed reactor, the outer end is connected to an external silicon powder feeding mechanism, and the inner end is arranged inside the cold hydrogeneration fluidized bed reactor; the silicon powder feeding disperser includes a metal ball and a metal rod, and the metal ball is welded to the outlet at the inner end of the silicon powder feeding pipeline through the metal rod.

[0006] Specifically, the metal rod is bent so that the metal ball is located at the outlet of the inner end of the silicon powder feeding pipeline, and the silicon powder entering the cold hydrogeneration fluidized bed reactor from the outlet of the silicon powder feeding pipeline can impact on the metal ball.

[0007] Specifically, the silicon powder feeding pipeline is inclined, and the angle between it and the side wall of the cold hydrogeneration fluidized bed reactor is 45° - 75°, preferably 60°.

[0008] Further, the ratio between the inner diameter of the silicon powder feeding pipeline and the outer diameter of the metal ball is 0.8 - 1.2:1, preferably 1:1.

[0009] Furthermore, the distance between the metal ball and the outlet at the inner end of the silicon powder pushing pipeline does not exceed 100 mm.

[0010] Furthermore, the metal rod is connected to an external static grounding wire to eliminate the static electricity generated by the friction of the metal ball.

[0011] Preferably, both the metal ball and the metal rod are of hollow structure.

[0012] Furthermore, a thermal electrode is arranged inside the metal ball. The thermal electrode is connected to an external thermocouple monitoring device by a wire passing through the metal rod, and is used to monitor the temperature change inside the metal ball.

[0013] Furthermore, an optical fiber probe is arranged inside the metal ball. The optical fiber probe is connected to an external optical fiber probe monitoring device by an optical fiber passing through the metal rod, and is used to monitor the powder stacking state.

[0014] Preferably, the thermal electrode and the optical fiber probe are located on the back of the contact surface between the metal ball of the pushing and dispersing device and the silicon powder, so as to avoid damage to the components caused by the friction of the silicon powder. Beneficial Effects

[0015] (1) The silicon powder pushing and dispersing device of the present utility model is composed of two parts, a metal ball and a metal rod; it plays the role of timely dispersing the silicon powder and maintaining a stable fluidization state. Static electricity is easily generated by the friction between the silicon powder and the metal ball of the pushing and dispersing device, and the static electricity can be eliminated through the static grounding module connected to the outside of the metal rod.

[0016] (2) Except for the part welded to the upper outer wall of the pushing pipeline, the rest of the surface of the silicon powder pushing and dispersing device of the present utility model is sprayed with wear-resistant materials, integrally formed, wear-resistant and stress-dispersing, and suitable for long-term operation.

[0017] (3) In the present utility model, the dispersing device can be welded to the pushing pipeline, with simple operation and wide applicability.

[0018] (4) The dispersing device of the present utility model is internally provided with an optical fiber probe and a thermal electrode, and can monitor the operation parameters of the fluidized bed in real time, such as the pushing temperature of the fluidized bed, the bed layer distribution around the pushing port, the bubble diameter, and the solid content. Description of the Drawings

[0019] The following further specifically describes the present utility model in conjunction with the drawings and specific embodiments, and the above and / or other advantages of the present utility model will become clearer.

[0020] Figure 1 is the overall structural schematic diagram of the silicon powder pushing device.

[0021] Figure 2 is the internal structural schematic diagram of the silicon powder pushing and dispersing device.

[0022] Among them, each attached drawing reference numeral represents respectively:

[0023] 1 - Cold hydrogenation fluidized bed reactor; 2 - Silicon powder feeding pipeline; 3 - Silicon powder feeding disperser; 4 - Optical fiber; 5 - Conducting wire; 6 - Static grounding wire; 7 - Optical fiber probe monitoring device; 8 - Optical fiber probe; 9 - Thermal electrode. Specific embodiments

[0024] The present utility model can be better understood according to the following embodiments.

[0025] The structures, ratios, sizes, etc. shown in the attached drawings of the specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present utility model. Therefore, they do not have technical essential significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "front", "rear", "middle", etc. cited in this specification are only for the convenience of clear narration and are not used to limit the scope for the implementation of the present utility model. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope for the implementation of the present utility model.

[0026] Combined with Figure 1 and Figure 2 , the silicon powder feeding device of the cold hydrogenation fluidized bed reactor of the present utility model includes a cold hydrogenation fluidized bed reactor 1, a silicon powder feeding pipeline 2, and a silicon powder feeding disperser 3.

[0027] Among them, the silicon powder feeding pipeline 2 penetrates through the side wall of the cold hydrogenation fluidized bed reactor 1, the outer end is connected to an external silicon powder feeding mechanism, and the inner end is arranged inside the cold hydrogenation fluidized bed reactor 1; the silicon powder feeding disperser 3 includes a metal ball and a metal rod, and the metal ball is welded to the outlet at the inner end of the silicon powder feeding pipeline 2 through the metal rod.

[0028] Among them, the metal rod is bent so that the metal ball is located at the outlet of the inner end of the silicon powder feeding pipeline 2, and the silicon powder entering the cold hydrogenation fluidized bed reactor 1 from the outlet of the silicon powder feeding pipeline 2 can impact on the metal ball.

[0029] In this embodiment, the silicon powder feeding pipeline 2 is inclined, and the angle with the side wall of the cold hydrogenation fluidized bed reactor 1 is 60°.

[0030] In this embodiment, the ratio between the pipe diameter (inner diameter of the pipe) of the silicon powder feeding pipeline 2 and the outer diameter (diameter) of the metal ball is 1:1.

[0031] In this embodiment, the distance between the metal ball and the outlet at the inner end of the silicon powder feeding pipeline 2 does not exceed 100 mm.

[0032] In this embodiment, the metal rod is connected to an external static grounding wire 6 to eliminate the static electricity generated by the friction of the metal ball.

[0033] In this embodiment, both the metal ball and the metal rod are of hollow structure.

[0034] In this embodiment, a thermal electrode 9 is arranged inside the metal ball. The thermal electrode 9 is connected to an external thermocouple monitoring device by a wire 5 passing through the metal rod, and is used to monitor the temperature change inside the metal ball.

[0035] In this embodiment, an optical fiber probe 8 is arranged inside the metal ball. The optical fiber probe 8 is connected to an external optical fiber probe monitoring device 7 by an optical fiber 4 passing through the metal rod, and is used to monitor the powder stacking state.

[0036] In this embodiment, the thermal electrode and the optical fiber probe are located on the back of the contact surface between the metal ball of the feeding and dispersing device and the silicon powder, so as to avoid damage to the components caused by the friction of the silicon powder.

[0037] During use, the silicon powder enters the cold hydrofluorination fluidized bed reactor 1 through the silicon powder feeding pipeline 2. With a certain initial velocity, it will continue to move downward and forward, hitting the metal ball to achieve the dispersion of the silicon powder. The spherical shape has uniform stress and can better disperse the silicon powder. The wear-resistant material on the surface of the metal ball ensures its long-term operation without being worn. The bent metal rod is welded to the feeding pipeline, which is simple and applicable to various feeding pipelines. The silicon powder feeding and dispersing device is integrally formed to ensure that its stress will not be overly concentrated and it will not be deformed or damaged during long-term operation. The metal rod is inserted into the fluidized bed from the outside. The inside of the metal ball and the metal rod is hollow to introduce the thermal electrode 9 and the optical fiber probe 8. Their functions are as follows: monitor the temperature distribution around the feeding port through the thermocouple, judge whether the feeding is smooth and whether there is a blockage phenomenon around the feeding port according to the temperature. Monitor the fluidized bed operation parameters such as the bed layer distribution, bubble diameter, and solid content around the feeding port through the optical fiber probe, judge whether the bed layer is in a good fluidization state, and adjust the feeding form in time. The thermal electrode 9 is connected to an external junction box to realize temperature measurement. The optical fiber probe 8 is connected to a computer through an optical fiber to monitor and analyze the feeding and bed layer parameters in the fluidized bed in real time. The friction between the silicon powder and the metal ball of the feeding and dispersing device is likely to generate static electricity, which can be eliminated by the static grounding module connected to the outside of the metal rod.

[0038] Through this feeding device, the rapid dispersion of the silicon powder into the fluidized bed can be realized, and the influence on the fluidization of the silicon powder in the fluidized bed can be reduced; the bed layer stability and product yield are increased, and the operation cycle is prolonged. Real-time monitoring of the fluidized bed feeding temperature, fluidized bed operation parameters such as the bed layer distribution, bubble diameter, and solid content around the feeding port helps to optimize and adjust various operation parameters. This device has a simple structure, is easy to implement, and is applicable to various cold hydrofluorination fluidized beds.

[0039] The utility model provides an idea and method for a silicon powder feeding device of a cold hydrofluoric acid fluidized bed reactor. There are many methods and ways to specifically implement this technical solution. The above is only the preferred embodiment of the utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the utility model. Each component not clearly defined in this embodiment can be realized by the prior art.

Claims

1. A silicon powder feeding device for a cold hydrofluoric acid fluidized bed reactor, characterized in that, It includes a cold hydrofluosilation fluidized bed reactor (1), a silicon powder feeding pipeline (2), and a silicon powder feeding disperser (3); the silicon powder feeding pipeline (2) penetrates through the side wall of the cold hydrofluosilation fluidized bed reactor (1), the outer end is connected to an external silicon powder feeding mechanism, and the inner end is arranged inside the cold hydrofluosilation fluidized bed reactor (1); the silicon powder feeding disperser (3) includes a metal ball and a metal rod, and the metal ball is welded to the outlet of the inner end of the silicon powder feeding pipeline (2) through the metal rod.

2. The silicon powder pushing device of the cold hydrofluoric acid fluidized bed reactor according to claim 1, characterized in that The metal rod is bent so that the metal ball is located at the outlet of the inner end of the silicon powder feeding pipeline (2), and the silicon powder entering the cold hydrofluosilation fluidized bed reactor (1) from the outlet of the silicon powder feeding pipeline (2) can impact on the metal ball.

3. The silicon powder pushing device of the cold hydrofluoric acid fluidized bed reactor according to claim 1, characterized in that, The silicon powder feeding pipeline (2) is inclined, and the angle with the side wall of the cold hydrofluosilation fluidized bed reactor (1) is 45° - 75°.

4. The silicon powder pushing device of the cold hydrogenation fluidized bed reactor according to claim 1, characterized in that The ratio between the pipe diameter of the silicon powder feeding pipeline (2) and the outer diameter of the metal ball is 0.8 - 1.2:

1.

5. The silicon powder pushing device of the cold hydrofluoric acid fluidized bed reactor according to claim 1, characterized in that The distance between the metal ball and the outlet of the inner end of the silicon powder feeding pipeline (2) does not exceed 100 mm.

6. The silicon powder pushing device of the cold hydrogenation fluidized bed reactor according to claim 1, characterized in that, The metal rod is connected to an external static grounding wire (6) to eliminate the static electricity generated by the friction of the metal ball.

7. The silicon powder pushing device of the cold hydrofluoric acid fluidized bed reactor according to claim 1, characterized in that, Both the metal ball and the metal rod are of hollow structure.

8. The silicon powder feeding device of the cold hydrofluoric acid fluidized bed reactor according to claim 7, characterized in that A thermal electrode (9) is arranged inside the metal ball, and the thermal electrode (9) is connected to an external thermocouple monitoring device by a wire (5) passing through the metal rod, for monitoring the temperature change inside the metal ball.

9. The silicon powder pushing device of the cold hydrofluoric acid fluidized bed reactor according to claim 8, characterized in that, An optical fiber probe (8) is arranged inside the metal ball, and the optical fiber probe (8) is connected to an external optical fiber probe monitoring device (7) by an optical fiber (4) passing through the metal rod, for monitoring the powder stacking state.

10. The silicon powder feeding device of the cold hydrofluoric acid fluidized bed reactor according to claim 9, characterized in that, The thermal electrode and the optical fiber probe are located on the back of the contact surface between the metal ball of the feeding disperser and the silicon powder, to avoid damage to the components caused by the friction of the silicon powder.

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