阅读说明：本技术 连通装置和残液提纯系统 (Intercommunication device and raffinate purification system ) 是由 万烨 曾晓国 李俊杰 严大洲 孙强 于 2019-10-22 设计创作，主要内容包括：本发明公开了连通装置和残液提纯系统。其中,连通装置包括：本体,所述本体沿长度方向的两端分别具有进液口、出液口,所述本体内部限定有容纳空间；搅拌机构,所述搅拌机构包括旋转轴,所述旋转轴设在所述容纳空间内,所述旋转轴上设有多个刮刀和多个搅拌叶片组；其中,每个所述搅拌叶片组包括一个正向搅拌叶片和一个反向搅拌叶片,所述正向搅拌叶片的直径大于所述反向搅拌叶片的直径；驱动机构,所述驱动机构包括驱动电机,所述驱动电机设在所述本体的一端,且与所述旋转轴相连。采用该连通装置作为物料输送管道,可以有效解决管道堵塞的问题,且连通装置具有结构简单、检修方便等优点。(The invention discloses a communication device and a raffinate purification system. Wherein, the intercommunication device includes: the liquid storage device comprises a body, a liquid storage tank and a liquid outlet, wherein a liquid inlet and a liquid outlet are respectively formed in two ends of the body along the length direction, and an accommodating space is defined in the body; the stirring mechanism comprises a rotating shaft, the rotating shaft is arranged in the accommodating space, and a plurality of scrapers and a plurality of stirring blade groups are arranged on the rotating shaft; each stirring blade group comprises a forward stirring blade and a reverse stirring blade, and the diameter of the forward stirring blade is larger than that of the reverse stirring blade; and the driving mechanism comprises a driving motor, and the driving motor is arranged at one end of the body and is connected with the rotating shaft. Adopt this intercommunication device as material pipeline, can effectively solve the problem of pipeline jam, and the intercommunication device has advantages such as simple structure, maintenance convenience.)

1. A communication device, comprising:

the liquid storage device comprises a body, a liquid storage tank and a liquid outlet, wherein a liquid inlet and a liquid outlet are respectively formed in two ends of the body along the length direction, and an accommodating space is defined in the body;

the stirring mechanism comprises a rotating shaft, the rotating shaft is arranged in the accommodating space, and a plurality of scrapers and a plurality of stirring blade groups are arranged on the rotating shaft; each stirring blade group comprises a forward stirring blade and a reverse stirring blade, and the diameter of the forward stirring blade is larger than that of the reverse stirring blade;

and the driving mechanism comprises a driving motor, and the driving motor is arranged at one end of the body and is connected with the rotating shaft.

2. The communication device according to claim 1, wherein the body is cylindrical in shape.

3. The communication device of claim 1, wherein the scraper is spaced from the inner wall of the body by no more than 10 mm; preferably, the distance between the scraper and the inner wall of the body is 1.5-10 mm.

4. The communication device of claim 1, wherein the scraper is a leaf spring scraper.

5. The communicating device according to claim 1, wherein in one of the stirring blade groups, the forward stirring blade and the reverse stirring blade are spaced from each other by 700 to 900 mm.

6. The communication device according to claim 1, wherein the angle between the forward stirring blade and the rotation shaft is 40 to 50 °, and the angle between the reverse stirring blade and the rotation shaft is 130 to 140 °.

7. The communication device according to claim 1, wherein a seal structure is provided between the drive motor and the rotary shaft.

8. The communication device according to claim 1, further comprising: and the liquid outlet is arranged on the lower part of the body and is positioned between the liquid inlet and the liquid outlet.

9. A communication device according to any of claims 1 to 8, further comprising: a support mechanism comprising a plurality of standoffs.

10. A raffinate purification system, comprising:

a raffinate purification column having a discharge port and a feed back port;

the communicating means of any one of claims 1 to 9, wherein a liquid inlet of the communicating means is connected to a discharge port of the raffinate purification column;

and the reboiler is connected with the liquid outlet of the communicating device and the feed back port of the residual liquid purifying tower.

Technical Field

The invention relates to the field of chemical industry, in particular to a communication device and a residual liquid purification system.

Background

A large amount of silicon tetrachloride is produced in the process of producing polysilicon by the improved Siemens method. At present, most polysilicon enterprises adopt a silicon tetrachloride cold hydrogenation technology to treat byproducts and convert the byproducts into trichlorosilane which is a raw material for producing polysilicon. The silicon tetrachloride cold hydrogenation technology is that metallurgical grade silicon powder, hydrogen and silicon tetrachloride react under the action of a catalyst under the conditions of certain temperature and pressure to generate trichlorosilane. Because metallurgical-grade silicon powder contains metal impurities, fine silicon powder and metal impurities can be introduced into hydrogenated products (chlorosilane). In the quenching tower or the leaching tower and the subsequent chlorosilane rough distillation process, in order to prevent equipment blockage and remove metal impurities, the fine silicon powder and the metal impurities are discharged from the bottom of the tower along with silicon tetrachloride liquid, and the discharged part of solid-liquid mixture is hydrogenated residual liquid. Discharging the generated hexachlorodisilane, siloxane and other polysilicichlorosilanes along with the residual liquid in a tail gas dry distillation process, and mixing the discharged hexachlorodisilane, siloxane and other polysilicichlorosilanes with the hydrogenated residual liquid to obtain chlorosilane residual liquid in the production process of the polysilicon. After crude silicon powder is primarily separated from chlorosilane residual liquid by a filter, the chlorosilane residual liquid is sent to a residual liquid purification tower for purification, a large amount of silicon tetrachloride is recovered, the residual liquid in a tower kettle is concentrated residual liquid, which is called secondary residual liquid, and the residual liquid is sent to a residual liquid drying and recovery system. The residual liquid contains silicon powder and metal chloride, which is easy to block equipment and pipelines. In the process of purifying the residual liquid, a large amount of silicon powder and metal chloride are enriched in a tower kettle, and the pipe diameter of a liquid phase communicating pipe of the tower kettle and a reboiler is large, so that the liquid phase communicating pipe is slow in liquid phase flow velocity, the pipeline is easy to block, and the residual liquid purifying tower cannot continuously and stably operate.

The problem of blockage of a liquid phase pipe of a tower kettle of a raffinate purification tower is an old and difficult problem of polysilicon enterprises, a better solution is not provided temporarily, most manufacturers are provided with two raffinate purification towers, the towers are stopped for maintenance after the operating towers are blocked, and the standby towers are opened at the same time. In the process of tower stopping and maintenance, materials need to be poured and replaced, a large amount of manpower and material resources are wasted, and residual chlorosilane in the pipeline is easy to react with air in the process of maintenance, hydrochloric acid is generated, surrounding equipment and pipelines are corroded, and the surrounding operation environment is polluted. Therefore, the existing polysilicon production equipment still needs to be improved.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, it is an object of the present invention to provide a means for communicating with a raffinate purification system. Adopt this intercommunication device as material pipeline, can effectively solve the problem of pipeline jam, and the intercommunication device has advantages such as simple structure, maintenance convenience.

In one aspect of the invention, a communication device is provided. According to an embodiment of the invention, the communication device comprises: the liquid storage device comprises a body, a liquid storage tank and a liquid outlet, wherein a liquid inlet and a liquid outlet are respectively formed in two ends of the body along the length direction, and an accommodating space is defined in the body; the stirring mechanism comprises a rotating shaft, the rotating shaft is arranged in the accommodating space, and a plurality of scrapers and a plurality of stirring blade groups are arranged on the rotating shaft; each stirring blade group comprises a forward stirring blade and a reverse stirring blade, and the diameter of the forward stirring blade is larger than that of the reverse stirring blade; and the driving mechanism comprises a driving motor, and the driving motor is arranged at one end of the body and is connected with the rotating shaft.

The communicating device is used as a material conveying pipeline, materials discharged by upstream equipment enter the containing space in the communicating device body through the liquid inlet at one end of the communicating device body, and move to the liquid outlet at the other end of the communicating device body along with the rotation of the rotating shaft driven by the driving motor and are discharged to downstream equipment through the liquid outlet. The stirring mechanism adopts bidirectional stirring, the forward stirring blade and the reverse stirring blade act together to enable the material to be in a violent turbulent flow state, and the diameter of the forward stirring blade is larger than that of the reverse stirring blade, so that the overall flowing direction of the fluid cannot be influenced. Meanwhile, the scraper on the rotating shaft can timely remove the problem of deposition on the inner wall of the equipment. Therefore, under the disturbance of the stirring mechanism, the materials are not easy to deposit in the conveying process, so that the problem of blockage of the communication pipeline can be effectively solved. The communicating device is used as a communicating pipeline between the residual liquid purifying tower and the reboiler in the improved Siemens method polysilicon production process, so that silicon powder and metal chloride in chlorosilane residual liquid can be effectively prevented from being deposited and blocked in the pipeline, the residual liquid purifying tower can stably run for a long time, the problems of maintenance cost and environmental pollution caused by frequent maintenance of the residual liquid purifying tower are avoided, the spare amount of the residual liquid purifying tower can be reduced, and the equipment investment is reduced. In addition, the communicating device has the advantages of simple structure, small structural size, convenient maintenance and the like.

In addition, the communication device according to the above embodiment of the present invention may further have the following additional technical features:

in some embodiments of the invention, the body is cylindrical in shape.

In some embodiments of the invention, the scraper is spaced from the inner wall of the body by no more than 10 mm.

In some embodiments of the invention, the distance between the scraper and the inner wall of the body is 1.5-10 mm.

In some embodiments of the invention, the scraper is a leaf spring scraper.

In some embodiments of the present invention, in one stirring blade group, the distance between the forward stirring blade and the reverse stirring blade is 700-900 mm.

In some embodiments of the present invention, an angle between the forward stirring blade and the rotating shaft is 40 to 50 °, and an angle between the reverse stirring blade and the rotating shaft is 130 to 140 °.

In some embodiments of the invention, the angle between the forward stirring blade and the rotating shaft is 45 °, and the angle between the reverse stirring blade and the rotating shaft is 135 °.

In some embodiments of the present invention, a sealing structure is provided between the driving motor and the rotating shaft.

In some embodiments of the invention, the communication device further comprises: and the liquid outlet is arranged on the lower part of the body and is positioned between the liquid inlet and the liquid outlet.

In some embodiments of the invention, the communication device further comprises: a support mechanism comprising a plurality of standoffs.

In another aspect of the invention, a raffinate purification system is provided. According to an embodiment of the present invention, the raffinate purification system comprises: a raffinate purification column having a discharge port and a feed back port; in the communicating device of the above embodiment, a liquid inlet of the communicating device is connected with a discharge hole of the raffinate purifying tower; and the reboiler is connected with the liquid outlet of the communicating device and the feed back port of the residual liquid purifying tower. Due to the density difference between the gas-liquid mixture in the reboiler and the tower bottom liquid of the raffinate purification tower, the tower bottom liquid flows to the reboiler through the communication device in the above embodiment under the action of thermosiphon. In the operation process of the raffinate purifying tower, the communication device continuously operates, liquid-phase silicon powder and metal chloride (aluminum chloride, titanium chloride and the like) are not easy to deposit under the disturbance of the stirring mechanism of the communication device, and meanwhile, a scraper in the stirring mechanism can timely remove the silicon powder and the metal chloride deposited on the inner wall of the device. Therefore, the residual liquid purification system can enable the residual liquid purification tower to stably operate for a long time by adopting the communication device of the embodiment, avoids the problems of maintenance cost and environmental pollution caused by frequent maintenance of the residual liquid purification tower, and can reduce the spare amount of the residual liquid purification tower, thereby reducing the equipment investment.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of a communication device according to one embodiment of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a schematic diagram of the configuration of a raffinate purification system according to one embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In one aspect of the invention, a communication device is provided. According to an embodiment of the present invention, referring to fig. 1, the communication device 1000 includes: body 100, stirring mechanism and actuating mechanism. Wherein, the body 100 is provided with a liquid inlet 101 and a liquid outlet 102 at two ends along the length direction, and the body 100 is internally defined with an accommodating space; the stirring mechanism includes a rotating shaft 200, the rotating shaft 200 is disposed in the accommodating space of the body 100, and a plurality of scrapers 210 and a plurality of stirring blade sets are disposed on the rotating shaft 200; wherein, each stirring blade group comprises a forward stirring blade 220 and a reverse stirring blade 230, and the diameter of the forward stirring blade 220 is larger than that of the reverse stirring blade 230; the driving mechanism includes a driving motor 300, and the driving motor 300 is disposed at one end of the body 100 and connected to the rotating shaft 200.

The communicating device is used as a material conveying pipeline, materials discharged by upstream equipment enter the containing space in the communicating device body through the liquid inlet at one end of the communicating device body, and move to the liquid outlet at the other end of the communicating device body along with the rotation of the rotating shaft driven by the driving motor and are discharged to downstream equipment through the liquid outlet. The stirring mechanism adopts bidirectional stirring, the forward stirring blade and the reverse stirring blade act together to enable the material to be in a violent turbulent flow state, and the diameter of the forward stirring blade is larger than that of the reverse stirring blade, so that the overall flowing direction of the fluid cannot be influenced. Meanwhile, the scraper on the rotating shaft can timely remove the problem of deposition on the inner wall of the equipment. Therefore, under the disturbance of the stirring mechanism, the materials are not easy to deposit in the conveying process, so that the problem of blockage of the communication pipeline can be effectively solved. The communicating device is used as a communicating pipeline between the residual liquid purifying tower and the reboiler in the improved Siemens method polysilicon production process, so that silicon powder and metal chloride in chlorosilane residual liquid can be effectively prevented from being deposited and blocked in the pipeline, the residual liquid purifying tower can stably run for a long time, the problems of maintenance cost and environmental pollution caused by frequent maintenance of the residual liquid purifying tower are avoided, the spare amount of the residual liquid purifying tower can be reduced, and the equipment investment is reduced. In addition, the communicating device has the advantages of simple structure, small structural size, convenient maintenance and the like.

The communication device according to an embodiment of the present invention is further described in detail below with reference to fig. 1-2.

The specific shape of the body 100 is not particularly limited according to the embodiment of the present invention, and may be selected by those skilled in the art according to actual needs. According to some embodiments of the invention, the body 100 is cylindrical in shape. Therefore, the material in the communication device can further flow, and the material is prevented from being blocked or deposited on the inner wall of the body.

According to an embodiment of the present invention, the blade 210 is spaced from the inner wall of the body 100 by no more than 10 mm. Thereby, the wall scraping effect of the scraper can be further improved.

According to an embodiment of the present invention, the distance between the scraper 210 and the inner wall of the body may be 1.5 to 10 mm, for example, 1.5 mm, 3 mm, 4.5 mm, 6 mm, 7.5 mm, or 10 mm. Thereby, the wall scraping effect of the scraper can be further improved. If the distance between the scraper and the inner wall of the body is too small, excessive friction between the scraper and the inner wall of the body can be caused, and the service life and the operation efficiency of the scraper are influenced; if the distance between the scraper and the inner wall of the body is too large, the effect of effectively cleaning materials attached to the inner wall is difficult to achieve.

According to an embodiment of the present invention, the scraper 210 may be a spring blade scraper. Specifically, the scraper 210 may be a detachable spring blade scraper, and the scraper may be made of a wear-resistant material, so that the running resistance of the scraper may be further reduced.

According to an embodiment of the present invention, in one stirring blade set, the distance between the forward stirring blade 220 and the reverse stirring blade 230 may be 700 to 900 mm, for example 700 mm, 750 mm, 800 mm, 850 mm or 900 mm. Specifically, the distance between the forward stirring blade 220 and the reverse stirring blade 230 is as l in fig. 2, and the inventor finds that, for silicon powder and metal chloride materials discharged from a raffinate purification tower in a polysilicon production process, by setting the distance between the forward stirring blade 220 and the reverse stirring blade 230 in the above range, the forward stirring blade and the reverse stirring blade can generate a better turbulence effect on the materials, and the loss to the forward stirring blade and the reverse stirring blade is smaller.

According to the embodiment of the present invention, an angle formed between the forward stirring blade 220 and the rotating shaft 200 may be 40 to 50 °, and preferably 45 °; the angle between the counter stirring blade 230 and the rotation shaft 200 may be 130 to 140 °, and preferably 135 °. Specifically, the angle between the forward stirring vanes 220 and the rotating shaft 200 is shown as α in fig. 2, and the angle between the reverse stirring vanes 230 and the rotating shaft 200 is shown as β in fig. 2. The inventor finds that, for silicon powder and metal chloride materials discharged from a raffinate purifying tower in a polysilicon production process, by setting the angle between the forward stirring blade 220 and the rotating shaft 200 and the angle between the reverse stirring blade 230 and the rotating shaft 200 in the above ranges, the forward stirring blade and the reverse stirring blade can generate a better turbulence effect on the materials, and the loss to the forward stirring blade and the reverse stirring blade is smaller.

According to an embodiment of the present invention, a sealing structure 400 is provided between the driving motor 300 and the rotating shaft 200. Therefore, leakage of materials from the rotating shaft can be effectively avoided. The specific kind of the sealing structure 400 is not particularly limited, and for example, a mechanical seal or a magnetic seal may be employed.

According to an embodiment of the present invention, the communication device further includes: a liquid discharge port 103. The liquid outlet 103 is disposed at the lower part of the body 100, is located between the liquid inlet 101 and the liquid outlet 102, and can be used for continuously discharging the residue (also called secondary residue) from the tower bottom.

According to an embodiment of the present invention, the communication device further includes: a support mechanism comprising a plurality of seats 500, the seats 500 being adapted to support the communicating means.

In another aspect of the invention, a raffinate purification system is provided. According to an embodiment of the present invention, referring to fig. 3, the raffinate purification system includes: the communication means 1000, raffinate purification column 2000 and reboiler 3000 of the above example. Wherein, the raffinate purification column 2000 has a discharge port 10 and a feed back port 20; a liquid inlet 101 of the communicating device 1000 is connected with a discharge hole 10 of the residual liquid purifying tower 2000; reboiler 3000 is connected to liquid outlet 102 of means for communicating 1000 with feed back port 20 of raffinate purification column 2000.

According to some embodiments of the present invention, the connection manner of the communication means 1000, the raffinate purification column 2000 and the reboiler 3000 is not particularly limited, and for example, flange connection or direct welding may be employed.

Due to the density difference between the gas-liquid mixture in the reboiler and the tower bottom liquid of the raffinate purification tower, the tower bottom liquid flows to the reboiler through the communication device in the above embodiment under the action of thermosiphon. In the operation process of the raffinate purifying tower, the communication device continuously operates, liquid-phase silicon powder and metal chloride (aluminum chloride, titanium chloride and the like) are not easy to deposit under the disturbance of the stirring mechanism of the communication device, and meanwhile, a scraper in the stirring mechanism can timely remove the silicon powder and the metal chloride deposited on the inner wall of the device. Therefore, the residual liquid purification system can enable the residual liquid purification tower to stably operate for a long time by adopting the communication device of the embodiment, avoids the problems of maintenance cost and environmental pollution caused by frequent maintenance of the residual liquid purification tower, and can reduce the spare amount of the residual liquid purification tower, thereby reducing the equipment investment.

In addition, it should be noted that the raffinate purification system has all the features and advantages described above for the communication means, and thus, the detailed description thereof is omitted.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.