Improved polycrystalline silicon cold hydrogenation fluidized bed reactor

Abstract

The utility model provides an improved polycrystalline silicon cold hydrogenation fluidized bed reactor, which relates to the technical field of polycrystalline silicon production and comprises a shell, a gas-phase inlet, a gas-phase outlet, a liquid-phase inlet, a liquid-phase outlet, a liquid-phase outlet and a liquid-phase outlet, the gas phase inlet adopts a smooth transition elbow structure; the interface arranged on the shell is connected with a matched part through a sealing assembly; and a sealing assembly. The sealing assembly comprises a first flange with a concave surface on one side; a convex surface matched with the concave surface is arranged on one side of the second flange; the bolt and the nut are used for connecting the first flange and the second flange. According to the utility model, a three-way structure of a gas phase inlet is improved into a smooth transition elbow structure, so that connection sealing points are reduced, and mechanical stress concentration points of a pipeline are eliminated, thereby reducing the operation risk; the original RJ sealing surface structure with high requirements on the mounting technology is changed into the FM sealing surface structure with simple requirements on the mounting technology, so that the labor intensity of manual mounting is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of polysilicon production, in particular to an improved polysilicon cold hydrogenation fluidized bed reactor. Background Art

[0002] The polysilicon cold hydrogenation fluidized bed reactor is a device used to produce high-purity silicon. Figure 1 The existing reactor includes a shell 11, and arranged on the shell 11: a gas phase inlet 12, a drain port 13, a silicon powder inlet 14, a hydrogen inlet 15, a support 16, a manhole 17, a thermometer interface 18, a gas phase outlet 19, a pressure gauge interface 21 and a safety valve interface 22.

[0003] The structural design of the existing reactor has the following defects:

[0004] 1. Since the design temperature of the original equipment is relatively high, the shell needs to have a higher wall thickness δ1, which results in a heavier total weight of the equipment and a large one-time investment (such as high construction cost).

[0005] 2. The equipment uses two thermometers, and the procurement cost of the thermometers is relatively high; there are two sealing points for the thermometer to be installed, and the number of sealing points is relatively large.

[0006] 3. The thickness δ1 of the outer insulation layer of the shell is relatively large, which requires the equipment interface to extend outward to a larger size, resulting in a large initial investment.

[0007] 4. The gas phase inlet of the equipment adopts a three-way structure. Based on the characteristics of the three-way structure, the inner wall of the gas phase inlet may produce local mechanical stress concentration at the connection seal when subjected to internal pressure, resulting in a high risk of leakage.

[0008] 5. A safety valve is installed on the top of the equipment. The safety valve needs to be interfaced with the equipment, which increases the sealing points and the risk of leakage.

[0009] 6. The flanges of each interface of the equipment are RJ sealing surfaces, which have high installation technical requirements and require a large number of hot and cold tightening operations, resulting in slow start and stop speeds of the equipment and high leakage rates at sealing points.

[0010] In view of the above-mentioned defects, the inventors have made improvements to the structure of the existing reactor to solve at least one of the defects.

[0011] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or any form of implication that the information constitutes the prior art known to those skilled in the art. Utility Model Content

[0012] In view of the above situation, the utility model provides an improved polysilicon cold hydrogenation fluidized bed reactor, aiming to solve at least one defect pointed out in the above background technology.

[0013] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0014] The utility model provides an improved polysilicon cold hydrogenation fluidized bed reactor, comprising a shell, and a gas phase inlet and a gas phase outlet arranged on the shell;

[0015] The gas phase inlet adopts a smooth transition elbow structure;

[0016] The interface provided on the housing is connected to the matching component through a sealing assembly;

[0017] The sealing assembly includes:

[0018] A first flange is connected to a corresponding interface provided on the housing; one side of the first flange has a concave surface;

[0019] A second flange connected to the matching component; one side of the second flange has a convex surface used in conjunction with the concave surface;

[0020] Bolts and nuts are used to connect the first flange and the second flange.

[0021] In some embodiments of the present invention, the sealing assembly further includes a sealing member disposed between the concave surface and the convex surface.

[0022] In some embodiments of the present invention, the sealing element comprises a herringbone gasket.

[0023] In some embodiments of the present invention, the sealing assembly further includes an anti-loosening member for preventing the nut from loosening.

[0024] In some embodiments of the present invention, the anti-loosening member includes a disc spring.

[0025] In some embodiments of the present invention, a thermometer interface is provided on the housing.

[0026] In some embodiments of the present invention, the number of the thermometer interface is 1.

[0027] In some embodiments of the present invention, the thermometer interface is connected to the matching thermometer through a sealing component.

[0028] In some embodiments of the present invention, a heat-insulating layer is provided outside the shell.

[0029] In some embodiments of the utility model, the gas phase outlet is connected to a matching discharge pipeline; and a safety valve interface is provided on the matching discharge pipeline.

[0030] The embodiments of the present invention have at least the following advantages or beneficial effects:

[0031] 1. The three-way structure of the gas phase inlet is improved to a smooth transition elbow structure, which reduces the connection sealing points and eliminates the mechanical stress concentration points of the pipeline, thereby reducing the risk of leakage during operation.

[0032] 2. The original RJ sealing surface structure with high installation technology requirements is changed to the FM sealing surface structure with simple installation technology requirements to reduce the labor intensity of manual installation and improve operating efficiency and starting and stopping speed.

[0033] Other features and advantages of the present invention will be set forth in the following description, and in part will become apparent from the description, or may be understood by practicing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 It is a structural schematic diagram of the existing equipment;

[0036] Figure 2 It is a schematic diagram of the structure of an improved polysilicon cold hydrogenation fluidized bed reactor;

[0037] Figure 3 A schematic diagram of the structure of the sealing component.

[0038] Figure 1 Icons in: 11-shell, 12-gas phase inlet, 13-drain port, 14-silicon powder inlet, 15-hydrogen inlet, 16-support, 17-manhole, 18-thermometer interface, 19-gas phase outlet, 21-pressure gauge interface, 22-safety valve interface, 23-three-way structure, 24-insulation layer;

[0039] Figure 2 and Figure 3 Icons in: 31-shell, 32-gas phase inlet, 33-drain port, 34-silicon powder inlet, 35-hydrogen inlet, 36-support, 37-manhole, 38-thermometer interface, 39-gas phase outlet, 41-pressure gauge interface, 42-insulation layer, 43-elbow structure, 44-first flange, 45-second flange, 46-seal, 47-bolt, 48-nut, 49-anti-loosening part, 51-concave surface, 52-convex surface. DETAILED DESCRIPTION

[0040] In the following, only some exemplary embodiments are briefly described. As those skilled in the art can appreciate, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present invention.

[0041] In the description of the embodiments of the present invention, it needs to be understood that the orientation or positional relationship indicated by the terms "thickness", "top", "bottom", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0042] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0043] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0044] See also Figure 1 to Figure 3 The present application provides an improved polysilicon cold hydrogenation fluidized bed reactor, comprising a shell 31, and arranged on the shell 31: a gas phase inlet 32, a drain port 33, a silicon powder inlet 34, a hydrogen inlet 35, a support 36, a manhole 37, a thermometer interface 38, a gas phase outlet 39 and a pressure gauge interface 41.

[0045] The wall thickness of the shell 31 is δ3, δ3<δ1, and δ1 refers to the wall thickness of the existing equipment.

[0046] The shell 31 has a heat-insulating layer 42 outside, and the thickness of the heat-insulating layer 42 is δ4, δ4<δ2, and δ2 refers to the thickness of the heat-insulating layer 42 of the existing equipment.

[0047] The gas phase inlet 32 ​​is arranged at the bottom of the shell 31 , and the gas phase inlet 32 ​​adopts a smoothly transitioned elbow structure 43 .

[0048] The thermometer interface 38 is used to connect a thermometer, and the thermometer interface 38 is located at the top of the housing 31 and there is only one thermometer interface 38. In a specific implementation scenario, the thermometer is an armored thermometer.

[0049] The gas phase outlet 39 is used to be connected to a matching discharge pipeline, and a safety valve interface for installing a safety valve is provided on the matching discharge pipeline.

[0050] The above-mentioned interfaces (such as gas phase inlet 32, thermometer interface 38, gas phase outlet 39) provided on the housing 31 are connected to the matching components through a sealing assembly. The sealing assembly includes a first flange 44, a second flange 45, a sealing member 46, a bolt 47, a nut 48 and a locking member 49.

[0051] The first flange 44 is connected to a corresponding interface provided on the housing 31. One side of the first flange 44 has a concave surface 51.

[0052] The second flange 45 is connected to the matching component. One side of the second flange 45 has a convex surface 52 used in conjunction with the concave surface 51. The convex surface 52 and the concave surface 51 cooperate to form an FM sealing surface structure.

[0053] The sealing member 46 is disposed between the concave surface 51 and the convex surface 52. In a specific implementation scenario, the sealing member 46 includes a herringbone gasket.

[0054] The bolts 47 and the nuts 48 are used to connect the first flange 44 and the second flange 45 .

[0055] The anti-loosening member 49 is used to prevent the nut 48 from loosening. In a specific implementation scenario, the anti-loosening member 49 includes a disc spring.

[0056] In view of the above, the present application has made a series of structural adjustments based on the existing equipment, which has brought at least the following beneficial effects:

[0057] First, the wall thickness of the housing 31 is reduced, the total weight of the equipment is reduced, and the primary investment is reduced.

[0058] It should be noted that, under the premise of meeting the reaction operating temperature, by lowering the equipment design temperature to a reasonable value, those skilled in the art can reduce the wall thickness of the shell 31 accordingly, as long as the design requirements of the pressure vessel can be met.

[0059] Second, by reducing the thickness of the thermal insulation layer 42, the overhanging dimensions of each interface of the equipment are reduced.

[0060] It should be noted that those skilled in the art can select the thickness of the thermal insulation layer 42 as needed, as long as the improvement concept of reducing the thickness of the thermal insulation layer 42 is met.

[0061] 3. The original two thermometer interfaces 38 are reduced to one thermometer interface 38, and the number of thermometers purchased is reduced accordingly, which reduces the one-time investment and subsequent repair and maintenance costs, and reduces the risk points of leakage.

[0062] Fourth, the three-way structure of the gas phase inlet 32 ​​is improved to a smoothly transitioned elbow structure 43, which reduces the connection sealing points and eliminates the mechanical stress concentration points of the pipeline, thereby reducing the risk of leakage during operation.

[0063] 5. The safety valve interface is transferred to the matching discharge pipe connected to the gas phase outlet 39, which further reduces the number of interfaces of the shell 31, reduces the sealing points, and reduces the risk of equipment operation.

[0064] 6. The original RJ sealing surface structure with high installation technology requirements is changed to the FM sealing surface structure with simple installation technology requirements to reduce the labor intensity of manual installation and improve operating efficiency and starting and stopping speed.

[0065] 7. The combined application of herringbone gasket + disc spring + FM sealing surface structure jointly improves the sealing performance and reduces the leakage rate of static sealing points.

[0066] The specific implementation of the above-mentioned sealing assembly will be described below by way of example.

[0067] Example 1

[0068] See also Figure 1 to Figure 3 In this embodiment, the gas phase inlet 32 ​​is connected to the matching feed pipeline through a sealing component. The first flange 44 is connected to the gas phase inlet 32, and the second flange 45 is connected to the matching feed pipeline.

[0069] When connecting the gas phase inlet 32 ​​with the matching feed pipeline, the herringbone gasket can be first placed in the concave surface 51 of the first flange 44, and then the convex surface 52 of the second flange 45 can be placed in the concave surface 51 of the first flange 44, and then the first flange 44 and the second flange 45 can be connected and tightened by bolts 47, nuts 48 and anti-loosening parts 49, so as to conveniently complete the connection between the gas phase inlet 32 ​​and the matching feed pipeline.

[0070] Example 2

[0071] See also Figure 1 to Figure 3 In this embodiment, the thermometer interface 38 is connected to the matching thermometer through a sealing assembly. The first flange 44 is connected to the thermometer interface 38, and the second flange 45 is connected to the matching thermometer.

[0072] When connecting the thermometer interface 38 with the matching thermometer, the herringbone gasket can be first placed in the concave surface 51 of the first flange 44, and then the convex surface 52 of the second flange 45 can be placed in the concave surface 51 of the first flange 44, and then the first flange 44 and the second flange 45 can be connected and tightened by bolts 47, nuts 48 and anti-loosening parts 49, so as to conveniently complete the connection between the thermometer interface 38 and the matching thermometer.

[0073] Example 3

[0074] See also Figure 1 to Figure 3 In this embodiment, the gas phase outlet 39 is connected to the matching discharge pipe through a sealing component. The first flange 44 is connected to the gas phase outlet 39, and the second flange 45 is connected to the matching discharge pipe.

[0075] When connecting the gas phase outlet 39 with the matching discharge pipe, the herringbone gasket can be first placed in the concave surface 51 of the first flange 44, and then the convex surface 52 of the second flange 45 can be placed in the concave surface 51 of the first flange 44, and then the first flange 44 and the second flange 45 can be connected and tightened by bolts 47, nuts 48 and anti-loosening parts 49, so as to conveniently complete the connection between the gas phase outlet 39 and the matching discharge pipe.

[0076] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. In the absence of conflicts, the embodiments of the present application and the features in the embodiments may be combined with each other at will. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An improved polysilicon cold hydrogenation fluidized bed reactor, characterized in that: It comprises a shell, and: a gas phase inlet and a gas phase outlet arranged on the shell; The gas phase inlet adopts a smoothly transitioned elbow structure; An interface provided on the housing is connected to a matching component via a sealing assembly; The sealing assembly comprises: A first flange connected to a corresponding interface provided on the housing; one side of the first flange has a concave surface; A second flange connected to the matching component; one side of the second flange has a convex surface used in conjunction with the concave surface; Bolts and nuts are used to connect the first flange and the second flange.

2. The improved polysilicon cold hydrogenation fluidized bed reactor according to claim 1, characterized in that: The sealing assembly also includes a sealing member disposed between the concave surface and the convex surface.

3. The improved polysilicon cold hydrogenation fluidized bed reactor according to claim 2, characterized in that: The seal comprises a herringbone gasket.

4. The improved polysilicon cold hydrogenation fluidized bed reactor according to claim 1, characterized in that: The sealing assembly also includes an anti-loosening member for preventing the nut from loosening.

5. The improved polysilicon cold hydrogenation fluidized bed reactor according to claim 4, characterized in that: The anti-loosening member includes a disc spring.

6. The improved polysilicon cold hydrogenation fluidized bed reactor according to claim 1, characterized in that: The shell is provided with a thermometer interface.

7. The improved polysilicon cold hydrogenation fluidized bed reactor according to claim 6, characterized in that: The number of the thermometer interface is 1.

8. The improved polysilicon cold hydrogenation fluidized bed reactor according to claim 6, characterized in that: The thermometer interface is connected to the matching thermometer through a sealing component.

9. The improved polysilicon cold hydrogenation fluidized bed reactor according to claim 1, characterized in that: The shell is provided with a heat-insulating layer outside.

10. The improved polysilicon cold hydrogenation fluidized bed reactor according to any one of claims 1 to 9, characterized in that: The gas phase outlet is connected to a matching discharge pipeline; a safety valve interface is provided on the matching discharge pipeline.

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