Continuous feeding apparatus for fluidized bed of a cold hydrogenation unit

Abstract

The utility model relates to cold hydrogenation production technical field, and disclose a kind of continuous feeding equipment of cold hydrogenation device fluidized bed, including fluidized bed reactor A, fluidized bed reactor B, high-pressure silicon powder tank A, high-pressure silicon powder tank B, spare high-pressure silicon powder tank C, low-pressure silicon powder tank A and connecting pipeline, equipment starts, first by completing initial feed reserve, then, make high-pressure silicon powder tank A to fluidized bed reactor A feed, high-pressure silicon powder tank B to fluidized bed reactor B feed, spare high-pressure silicon powder tank C pass through hydrogen gas pressure charging pipeline to be charged to with fluidized bed reactor exists suitable pressure difference, in standby state, when high-pressure silicon powder tank A in silicon powder is about to be exhausted, by spare high-pressure silicon powder tank C to replace feed, simultaneously through tail gas venting pipeline to high-pressure silicon powder tank A pressure relief, re-pressurization standby after low-pressure silicon powder tank A replenishment, realize the continuous feeding of fluidized bed.

Description

Technical Field

[0001] This utility model relates to the field of cold hydrogenation production technology, and in particular to a continuous feeding device for a fluidized bed in a cold hydrogenation apparatus. Background Technology

[0002] In the cold hydrogenation production process, the fluidized bed reactor is the core equipment. This process involves vaporizing silicon tetrachloride and hydrogen in a specific ratio to form a mixed gas, which is then heated and introduced into the fluidized bed reactor. The flowing gas agitates the silicon powder within the reactor, giving it fluidized characteristics. Subsequently, under conditions of 3.0-3.5 MPa and 550-600℃, a catalyst is used to react and produce trichlorosilane and dichlorosilane. In existing technologies, silicon powder is fed into the fluidized bed intermittently, and each tank has a limited weight. When the material in the silicon powder tank is depleted, the high-pressure silicon powder tank needs to be depressurized and refilled. During the process of depressurizing and refilling the high-pressure silicon powder tank, the fluidized bed is in a state of material depletion, which is detrimental to the reaction. If this state persists for a long time, waste and impurities from the bed will be carried into the subsequent product system, affecting product quality. Utility Model Content

[0003] The technical problem this invention aims to solve is that existing technologies use intermittent feeding of silicon powder into a fluidized bed, and each container has a limited weight of silicon powder. When the silicon powder container is empty, it is necessary to depressurize the high-pressure container and refill it, which is detrimental to the reaction. Therefore, we propose a continuous feeding device for a fluidized bed in a cold hydrogenation apparatus.

[0004] To achieve the above objectives, this application adopts the following technical solution: a continuous feeding device for a fluidized bed in a cold hydrogenation unit, comprising a fluidized bed reactor A, a fluidized bed reactor B, a high-pressure silicon powder tank A, a high-pressure silicon powder tank B, a spare high-pressure silicon powder tank C, a low-pressure silicon powder tank A, and connecting pipelines. The low-pressure silicon powder tank A is connected to the high-pressure silicon powder tank A, the high-pressure silicon powder tank B, and the spare high-pressure silicon powder tank C via connecting pipelines. The high-pressure silicon powder tank A is connected to the fluidized bed reactor A via connecting pipelines. The high-pressure silicon powder tank B is connected to the fluidized bed reactor B via connecting pipelines. The spare high-pressure silicon powder tank C is connected to both the fluidized bed reactor A and the fluidized bed reactor B via connecting pipelines. Valves are provided on each of the multiple sets of connecting pipelines for controlling the on / off of silicon powder conveying.

[0005] Furthermore, the outer walls of the fluidized bed reactor A, fluidized bed reactor B, high-pressure silicon powder tank A, high-pressure silicon powder tank B, spare high-pressure silicon powder tank C, and low-pressure silicon powder tank A are all provided with connecting plates for connecting pipelines, and quick-connect components are provided between the connecting pipelines and the connecting plates.

[0006] Furthermore, the quick-connect assembly includes a quick connector rotatably connected to the connecting pipeline at one end, and a quick-connect cavity opened inside the connecting plate, wherein the quick connector is threadedly connected to the inner wall of the quick-connect cavity.

[0007] Furthermore, an auxiliary block is fixedly connected to the side wall of the quick connector, an adsorption magnetic block A is arranged around the outer wall of the quick connector, and an adsorption magnetic block B is arranged around the inner wall of the quick connector cavity. The adsorption magnetic block A and the adsorption magnetic block B are attracted to each other by opposite poles.

[0008] Furthermore, when the auxiliary block is attached to the outer wall of the connecting disk, the positions of the adsorption magnetic block A and the adsorption magnetic block B coincide.

[0009] Furthermore, the quick connector has an internal movable channel that connects the connecting pipeline and the connecting plate.

[0010] The technical effects and advantages of this utility model are as follows:

[0011] In this invention, after the equipment is started, the initial material supply and storage are completed first. Then, high-pressure silicon powder tank A supplies material to fluidized bed reactor A, and high-pressure silicon powder tank B supplies material to fluidized bed reactor B. At this time, the standby high-pressure silicon powder tank C is pressurized through the hydrogen pressurization pipeline to a suitable pressure difference with the fluidized bed reactor and is in standby mode. When the silicon powder in high-pressure silicon powder tank A is about to be exhausted, the standby high-pressure silicon powder tank C takes over the supply. At the same time, the high-pressure silicon powder tank A is depressurized through the exhaust gas venting pipeline, and then repressurized and put into standby mode after being replenished by the low-pressure silicon powder tank A. Similarly, when the high-pressure silicon powder tank A is about to be exhausted, the standby high-pressure silicon powder tank C takes over the supply. When the silicon powder in silicon powder tank B is about to run out, the backup high-pressure silicon powder tank C is activated to supply material to the fluidized bed reactor B. At the same time, the high-pressure silicon powder tank B is depressurized, replenished, and pressurized to achieve continuous feeding of the fluidized bed. This solves the problem that when silicon powder is fed into the fluidized bed intermittently, and the weight of silicon powder in each tank is limited, the high-pressure silicon powder tank needs to be depressurized and refilled after the material in the silicon powder tank is depleted. This causes the fluidized bed to be in a state of material shortage for a long time, which is not conducive to the reaction and will bring waste and impurities in the bed into the subsequent system products, affecting product quality. Attached Figure Description

[0012] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts:

[0013] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the overall structure of this utility model from another perspective;

[0015] Figure 3 For the present utility model Figure 1 A magnified structural diagram at point A;

[0016] Figure 4 This is a schematic diagram of the quick-connect assembly structure of this utility model.

[0017] Legend: 1. Fluidized bed reactor A; 2. Fluidized bed reactor B; 3. High-pressure silicon powder tank A; 4. High-pressure silicon powder tank B; 5. Standby high-pressure silicon powder tank C; 6. Low-pressure silicon powder tank A; 7. Connecting pipeline; 8. Connecting plate; 9. Quick-connect assembly; 91. Quick connector; 92. Quick-connect cavity; 93. Auxiliary block; 94. Adsorption magnetic block A; 95. Adsorption magnetic block B. Detailed Implementation

[0018] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0019] Please see Figures 1-4 To address the issue of intermittent feeding of silicon powder into a fluidized bed, where each container has a limited weight, and the need to depressurize and refill the high-pressure container after it runs out, resulting in prolonged bed depletion and hindering the reaction process, as well as introducing waste and impurities into downstream products and affecting product quality, the following preferred technical solution is provided:

[0020] A continuous feeding device for a fluidized bed in a cold hydrogenation unit includes a fluidized bed reactor A1, a fluidized bed reactor B2, a high-pressure silicon powder tank A3, a high-pressure silicon powder tank B4, a standby high-pressure silicon powder tank C5, a low-pressure silicon powder tank A6, and connecting pipelines 7. The low-pressure silicon powder tank A6 is connected to the high-pressure silicon powder tanks A3, B4, and C5 via the connecting pipelines 7. The high-pressure silicon powder tank A3 is connected to the fluidized bed reactor A1 via the connecting pipelines 7. The high-pressure silicon powder tank B4 is connected to the fluidized bed reactor B2 via the connecting pipelines 7. The standby high-pressure silicon powder tank C5 is connected to both the fluidized bed reactor A1 and B2 via the connecting pipelines 7. Valves are installed on multiple sets of connecting pipelines 7 to control the on / off flow of silicon powder. The standby high-pressure silicon powder tank C5 is also connected to a hydrogen blowing pipeline, a hydrogen pressurization pipeline, and a tail gas venting pipeline. Through the connection and coordination of the above components and pipelines, continuous feeding of the fluidized bed in the cold hydrogenation unit is achieved.

[0021] The outer walls of fluidized bed reactor A1, fluidized bed reactor B2, high-pressure silicon powder tank A3, high-pressure silicon powder tank B4, spare high-pressure silicon powder tank C5, and low-pressure silicon powder tank A6 are all equipped with connecting discs 8 for connecting pipelines 7. A quick-connect assembly 9 is provided between the connecting pipeline 7 and the connecting disc 8. The quick-connect assembly 9 includes a quick connector 91 rotatably connected to the connecting pipeline at one end, and a quick-connect cavity 92 opened inside the connecting disc 8. The quick connector 91 is threadedly connected to the inner wall of the quick-connect cavity 92. An auxiliary block 93 is fixedly connected to the side wall of the quick connector 91. An adsorption magnetic block A94 is arranged around the outer wall of the quick connector 91, and an adsorption magnetic block B95 is arranged around the inner wall of the quick-connect cavity 92. The adsorption magnetic blocks A94 and B95 are attracted by opposite poles. When the auxiliary block 93 is attached to the outer wall of the connecting disc 8, the positions of the adsorption magnetic blocks A94 and B95 coincide. The quick connector 91 has an internal movable channel that connects the connecting pipeline 7 and the connecting disc 8.

[0022] Specifically, after the equipment starts up, the low-pressure silicon powder tank A6 first supplies silicon powder to the high-pressure silicon powder tank A3, high-pressure silicon powder tank B4, and the standby high-pressure silicon powder tank C5 via connecting pipeline 7, completing the initial feeding and storage. Next, the valves on the connecting pipeline 7 between high-pressure silicon powder tank A3 and fluidized bed reactor A1, and between high-pressure silicon powder tank B4 and fluidized bed reactor B2, are opened, allowing high-pressure silicon powder tank A3 to supply material to fluidized bed reactor A1, and high-pressure silicon powder tank B4 to fluidized bed reactor B2. At this time, the standby high-pressure silicon powder tank C5 is pressurized through the hydrogen pressurization pipeline until a suitable pressure difference exists between it and the fluidized bed reactor, and is in standby mode. When the silicon powder in high-pressure silicon powder tank A3 is about to be exhausted, its valve to fluidized bed reactor A1 is closed, and the valve between the standby high-pressure silicon powder tank C5 and fluidized bed reactor A1 is opened, allowing the standby high-pressure silicon powder tank to supply material to the fluidized bed reactor. Silicon powder tank C5 takes over the feeding, while the high-pressure silicon powder tank A3 is depressurized through the exhaust gas venting pipeline. After being replenished by the low-pressure silicon powder tank A6, it is repressurized and ready for use. Similarly, when the silicon powder in the high-pressure silicon powder tank B4 is about to run out, the standby high-pressure silicon powder tank C5 is activated to feed the fluidized bed reactor B2. At the same time, the high-pressure silicon powder tank B4 is depressurized, replenished, and repressurized. During this process, the hydrogen blowing pipeline on the standby high-pressure silicon powder tank C5 prevents the pipeline from being blocked by silicon powder. Through this cyclical operation, continuous feeding of the fluidized bed is achieved, which solves the problem of intermittent feeding of silicon powder into the fluidized bed. Since the weight of silicon powder in each tank is limited, when the material in the silicon powder tank is depleted, the high-pressure silicon powder tank needs to be depressurized and refilled, which makes the fluidized bed in a state of material shortage for a long time, which is not conducive to the reaction and will bring waste and impurities in the bed into the downstream system products, affecting product quality.

[0023] During the overall equipment installation and pipeline connection process, firstly, align the quick connector 91 at one end of the connecting pipeline 7 with the connecting plate 8 on the outer wall of the corresponding tank (such as low-pressure silicon powder tank A6, high-pressure silicon powder tank A3, etc.). At this time, the magnetic adsorption block A94 on the outer wall of the quick connector 91 and the magnetic adsorption block B95 on the inner wall of the quick-connect cavity 92 generate attraction due to opposite polarities, guiding the quick connector 91 to quickly approach the quick-connect cavity 92 and achieve initial alignment. Subsequently, the operator holds the auxiliary block 93 on the side wall of the quick connector 91 and rotates it clockwise. Connector 91 gradually engages with the inner thread of quick-connect cavity 92. During this process, magnetic blocks A94 and B95 continuously attract each other, ensuring that the threaded connection direction is accurate and does not deviate. When auxiliary block 93 is completely in contact with the outer wall of connecting plate 8, it indicates that quick connector 91 has been screwed to the preset position. At this time, magnetic blocks A94 and B95 are completely overlapped, further enhancing the connection stability. Moreover, the active channel inside quick connector 91 accurately connects the connecting pipeline 7 and the connecting plate 8, realizing the smooth flow of silicon powder or gas.

[0024] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A continuous charging apparatus for a fluidized bed of a cold hydrogenation unit, characterized in that, The system includes a fluidized bed reactor A, a fluidized bed reactor B, a high-pressure silicon powder tank A, a high-pressure silicon powder tank B, a standby high-pressure silicon powder tank C, a low-pressure silicon powder tank A, and connecting pipelines. The low-pressure silicon powder tank A is connected to the high-pressure silicon powder tank A, the high-pressure silicon powder tank B, and the standby high-pressure silicon powder tank C via connecting pipelines. The high-pressure silicon powder tank A is connected to the fluidized bed reactor A via connecting pipelines. The high-pressure silicon powder tank B is connected to the fluidized bed reactor B via connecting pipelines. The standby high-pressure silicon powder tank C is connected to both the fluidized bed reactor A and the fluidized bed reactor B via connecting pipelines. Valves are installed on each of the connecting pipelines to control the on / off flow of silicon powder.

2. A continuous feeding apparatus for a fluidized bed of a cold hydrogenation unit according to claim 1, characterized in that: The outer walls of fluidized bed reactor A, fluidized bed reactor B, high-pressure silicon powder tank A, high-pressure silicon powder tank B, spare high-pressure silicon powder tank C, and low-pressure silicon powder tank A are all equipped with connecting plates for connecting pipelines, and quick-connect components are provided between the connecting pipelines and the connecting plates.

3. A continuous feeding apparatus for a fluidized bed of a cold hydrogenation unit according to claim 2, characterized in that: The quick-connect assembly includes a quick connector rotatably connected to a connecting pipeline at one end, and a quick-connect cavity opened inside the connecting plate, wherein the quick connector is threadedly connected to the inner wall of the quick-connect cavity.

4. A continuous feeding apparatus for a fluidized bed of a cold hydrogenation unit according to claim 3, characterized in that: An auxiliary block is fixedly connected to the side wall of the quick connector. An adsorption magnetic block A is arranged around the outer wall of the quick connector, and an adsorption magnetic block B is arranged around the inner wall of the quick connector cavity. The adsorption magnetic block A and the adsorption magnetic block B are attracted to each other by opposite polarities.

5. A continuous feeding apparatus for a fluidized bed of a cold hydrogenation unit according to claim 4, characterized in that: When the auxiliary block is attached to the outer wall of the connecting disk, the positions of magnetic adsorption block A and magnetic adsorption block B coincide.

6. A continuous feeding apparatus for a fluidized bed of a cold hydrogenation unit according to claim 5, characterized in that: The quick connector has an internal movable channel that connects the connecting pipeline and the connecting plate.

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