Heating structure and novel silicon powder drying tank

Abstract

The utility model provides a heating structure and a novel silicon powder drying tank, and relates to the technical field of polycrystalline silicon. The heating structure comprises a plurality of heating ring layers, and each heating ring layer comprises a plurality of heating pipes which are distributed in a circular array mode. A plurality of heating subareas, each heating subarea comprises at least one heating pipe, the number of the heating pipes of the heating subareas is the same or different, and the heating pipes of the heating subareas do not coincide; the control system is used for independently controlling the working states of the heating pipes in the heating subareas; wherein the total number of the heating pipes is larger than 36, and the number of the heating ring layers is larger than three. On one hand, the total number of the heating pipes is increased, and on the other hand, the internal space of the tank body is divided into a plurality of heating subareas which can be independently controlled, so that a more flexible heating operation mode is provided, the problem of uneven heating can be solved, and the energy-saving effect can also be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of polysilicon, in particular to a heating structure and a novel silicon powder drying tank. Background Art

[0002] In the polysilicon cold hydrogenation system, the silicon powder drying tank is used to heat and dry the silicon powder. Figure 1 The electric heating tubes of the previous generation of silicon powder drying tanks used by the company were vertically arranged blind tubes. There were 36 blind tubes in total, arranged in three circles with 6 tubes (innermost circle) + 12 tubes (middle circle) + 18 tubes (outermost circle). All the electric heating tubes were started and stopped synchronously, resulting in uneven heating, high energy consumption, poor drying effect, and other problems, which affected the normal production and conversion efficiency of the cold hydrogenation system.

[0003] 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

[0004] In view of the above situation, the utility model provides a heating structure and a novel silicon powder drying tank, aiming to solve the technical problems of uneven heating, high energy consumption and poor drying effect in existing equipment.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] In a first aspect, the utility model provides a heating structure, which is arranged in a silicon powder drying tank, comprising:

[0007] A plurality of heating ring layers, each of which comprises a plurality of uniformly distributed heating tubes;

[0008] A plurality of heating zones, each of which comprises at least one heating tube, the number of heating tubes in each heating zone is the same or different, and the heating tubes in each heating zone do not overlap;

[0009] A control system, used to independently control the working state of the heating tubes in each of the heating zones;

[0010] Among them, the total number of the heating tubes is greater than 36, and the number of the heating ring layers is greater than three.

[0011] In some embodiments of the present invention, the heating tube is an electric heating tube.

[0012] In some embodiments of the present invention, there are 60 heating tubes in total.

[0013] In some embodiments of the present invention, each of the heating ring layers is coaxially arranged.

[0014] In some embodiments of the present invention, there are four heating ring layers.

[0015] In some embodiments of the present invention, the number of heating tubes in each heating ring layer from the inside to the outside is 6, 12, 18, and 24 respectively.

[0016] In some embodiments of the present invention, each of the heating zones includes at least two heating tubes respectively located at two adjacent heating ring layers.

[0017] In some embodiments of the present invention, there are ten heating zones.

[0018] In some embodiments of the present invention, the two innermost heating ring layers together constitute four heating zones, and the two outermost heating ring layers together constitute six heating zones.

[0019] In a second aspect, the utility model provides a novel silicon powder drying tank, comprising: a tank body and the above-mentioned heating structure; the tank body is provided with a silicon powder inlet and a silicon powder outlet.

[0020] The embodiments of the present invention have at least the following advantages or beneficial effects:

[0021] 1. On the one hand, the total number of heating tubes is increased, and on the other hand, the internal space of the tank is divided into multiple independently controllable heating zones, thereby providing a more flexible heating operation mode, which can not only solve the problem of uneven heating, but also achieve energy-saving effects (the working status of the heating tubes in each heating zone is determined according to the moisture content of the silicon powder in each heating zone).

[0022] 2. The new silicon powder drying tank has a better drying effect on silicon powder and a lower moisture content in silicon powder.

[0023] 3. The new silicon powder drying tank can process a large amount of silicon powder at one time, which is conducive to improving production efficiency.

[0024] 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

[0025] 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.

[0026] Figure 1 It is a structural schematic diagram of an existing silicon powder drying tank;

[0027] Figure 2 It is a schematic diagram of the layout of the existing electric heating pipe;

[0028] Figure 3 A schematic diagram of the structure of a novel silicon powder drying tank provided in this embodiment;

[0029] Figure 4 A schematic diagram of the layout of the heating tubes provided in this embodiment.

[0030] icon:

[0031] 1-tank body, 11-safety discharge port, 12-temperature measuring port, 13-silicon powder inlet, 14-nitrogen outlet, 15-pressure gauge interface, 16-manhole, 17-support, 18-nitrogen inlet, 19-silicon powder outlet,

[0032] 2-heating partition, 21-heating tube, 22-fin,

[0033] 3- Blind pipe. DETAILED DESCRIPTION

[0034] 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.

[0035] In the description of the embodiments of the present invention, it should be understood that the terms "inside", "outside", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are 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.

[0036] In addition, the term "plurality" means two or more than two, unless clearly and specifically defined otherwise.

[0037] 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.

[0038] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0039] Example 1

[0040] The tank body 1 is provided with a safety relief port 11 , a temperature measuring port 12 , a silicon powder inlet 13 , a nitrogen outlet 14 , a pressure gauge interface 15 , a manhole 16 , a support 17 , a nitrogen inlet 18 and a silicon powder outlet 19 .

[0041] The heating structure includes a plurality of heating zones 2 , a control system (not shown in the figure) and at least four heating ring layers coaxially arranged with the tank body 1 .

[0042] Each heating ring layer includes a plurality of heating tubes 21 that are evenly distributed (such as in a circular array), and each heating tube 21 is arranged vertically (along Figure 3 Specifically, in this embodiment, the heating tubes 21 are electric heating tubes 21, a total of 60 tubes, and there are four heating ring layers. From the inside to the outside, the number of heating tubes 21 in each heating ring layer is 6, 12, 18, and 24, respectively.

[0043] In other embodiments, the total number of heating tubes 21 and the number of heating coil layers may be adjusted as needed, as long as the total number of heating tubes 21 is greater than 36 and the number of heating coil layers is greater than three.

[0044] A plurality of heating zones 2 are arranged in the tank body 1, each heating zone 2 includes at least one heating tube 21, the number of heating tubes 21 in each heating zone 2 is the same or different, and the heating tubes 21 in each heating zone 2 do not overlap. In this embodiment, each heating zone 2 includes at least two heating tubes 21 respectively located in two adjacent heating ring layers; preferably, there are ten heating zones 2, the two innermost heating ring layers together constitute four heating zones 2, and the two outermost heating ring layers together constitute six heating zones 2.

[0045] The control system is used to independently control the working state of the heating tubes 21 in each heating zone 2.

[0046] In combination with the above content, this embodiment has at least the following beneficial effects:

[0047] 1. On the one hand, the total number of heating tubes 21 is increased, and on the other hand, the internal space of the tank body 1 is divided into a plurality of independently controllable heating zones 2, thereby providing a more flexible heating operation mode, which can not only solve the problem of uneven heating, but also achieve energy-saving effects (the working state of the heating tubes 21 in each heating zone 2 is determined according to the moisture content of the silicon powder in each heating zone 2).

[0048] 2. The new silicon powder drying tank has a better drying effect on silicon powder and a lower moisture content in silicon powder.

[0049] 3. The new silicon powder drying tank can process a large amount of silicon powder at one time, which is conducive to improving production efficiency.

[0050] Example 2

[0051] See also Figure 3 , which is different from Example 1, in this embodiment, a plurality of fins 22 are distributed on the outer wall of the heating tube 21 to increase the surface area and improve the heating effect (previously it was a blind tube).

[0052] 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. A heating structure, arranged in a silicon powder drying tank, characterized in that: include: A plurality of heating ring layers, each of which comprises a plurality of uniformly distributed heating tubes; A plurality of heating zones, each of which comprises at least one heating tube, the number of heating tubes in each heating zone is the same or different, and the heating tubes in each heating zone do not overlap; A control system, used to independently control the working state of the heating tubes in each of the heating zones; Among them, the total number of the heating tubes is greater than 36, and the number of the heating ring layers is greater than three.

2. The heating structure according to claim 1, characterized in that: The heating tube is an electric heating tube.

3. The heating structure according to claim 1, characterized in that: There are 60 heating tubes in total.

4. The heating structure according to claim 1, characterized in that: Each of the heating ring layers is coaxially arranged.

5. The heating structure according to claim 3, characterized in that: There are four heating ring layers.

6. The heating structure according to claim 5, characterized in that: From the inside to the outside, the number of heating tubes in each heating circle layer is 6, 12, 18 and 24 respectively.

7. The heating structure according to claim 5, characterized in that: Each of the heating zones includes at least two heating tubes respectively located at two adjacent heating ring layers.

8. The heating structure according to claim 6, characterized in that: There are ten heating zones.

9. The heating structure according to claim 7, characterized in that: The two innermost heating ring layers together constitute four heating zones, and the two outermost heating ring layers together constitute six heating zones.

10. A novel silicon powder drying tank, characterized in that: It comprises a tank body and a heating structure as claimed in any one of claims 1 to 9; the tank body is provided with a silicon powder inlet and a silicon powder outlet.

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