Chlorosilane-containing silicon dust collection device

Abstract

The application provides a chlorosilane-containing silica ash collecting device, which comprises a tank body, a jacket layer arranged on the outer wall of the tank body, a flange assembly arranged on the top and bottom of the jacket layer, a discharge port arranged on the bottom of the tank body, an air inlet arranged on the tank body, a filter assembly arranged on the top of the tank body and extending into the tank body, and an air outlet arranged on the top of the filter assembly. The jacket layer arranged on the outer wall of the tank body can continuously heat and keep the tank body warm, and the flange assembly arranged on the top and bottom of the jacket layer can make the temperature-controllable heat-conducting fluid enter and exit the jacket layer. The temperature of the tank body is kept constant by controlling the temperature of the temperature-controllable heat-conducting fluid, so that the condensation of the mixed gas caused by the excessively low temperature is avoided. The problem that the mixed gas is condensed due to the influence of the ambient temperature in the prior art is solved, so that the condensed liquid contacts the silica ash, the silica ash is agglomerated, and the collection of the silica ash is affected.

Description

Technical Field

[0001] This utility model relates to the technical field of silica fume collection, and in particular to a silica fume collection device containing chlorosilane. Background Technology

[0002] In the production process of chlorosilanes, byproducts such as silicon tetrachloride, dichlorosilane, and silicon powder are often generated simultaneously, forming a mixed gas. Among them, silica ash, as a solid waste generated in the production process of chlorosilanes, needs to be separated from the mixed gas to obtain chlorosilane gas with higher purity.

[0003] The mainstream separation process for silica fume in the current technology is to use dry separation, which transports the exhaust gas to a bag filter through a cyclone separator to achieve the recovery of chlorosilane and the safe separation of silica powder. Since the filter bags used in the bag filter (such as PPS and PTFE materials) have strict temperature tolerance limits, the exhaust gas needs to be cooled in a cooling box before entering the bag filter to prevent high-temperature objects from damaging the filter bags.

[0004] However, the mixed gas will condense due to the influence of ambient temperature, causing the condensed liquid to come into contact with silica fume, resulting in silica fume agglomeration and affecting the collection of silica fume. Utility Model Content

[0005] The purpose of this invention is to solve the problem in the prior art where the mixed gas condenses due to the influence of ambient temperature, causing the condensed liquid to come into contact with silica fume, resulting in silica fume agglomeration and affecting the collection of silica fume.

[0006] To achieve the above objectives, this application proposes a chlorinated silane silica fume collection device, comprising: Tank body; A jacket fitted onto the outer wall of the tank body for continuous heating and insulation; The interlayer is provided with a flange assembly at both the top and bottom; The discharge port is located at the bottom of the tank. An air inlet is provided on the tank body; A filter assembly disposed at the top of the tank and extending into the interior of the tank; An air outlet is provided on the top of the filter assembly.

[0007] This application provides a jacketed structure on the outer wall of the tank for continuous heating and insulation. A flange assembly is located at both the top and bottom of the jacket, allowing temperature-controlled heat transfer fluid to enter and exit. By controlling the temperature of the heat transfer fluid, the internal temperature of the tank is kept constant, preventing condensation of the mixed gas due to excessively low temperatures. This solves the problem in existing technologies where the mixed gas condenses due to ambient temperature, causing the condensed liquid to come into contact with silica fume, resulting in silica fume agglomeration and hindering silica fume collection.

[0008] Furthermore, in order to allow the temperature-controlled heat-conducting fluid to fill the interlayer, the interlayer forms an insulation channel, and the insulation channel also has an inlet located at the bottom of the interlayer and an outlet located at the top of the interlayer.

[0009] Furthermore, in order to utilize the gravity of silica fume to assist in settling, the air inlet is located at the top of the tank.

[0010] Furthermore, in order to achieve a rigid sealing connection between the flange and the clamp, an extended-layout filter bag is provided. The filter assembly includes: a filter bag extending into the tank body, a flange fitted over the open end of the filter bag and connected to the air outlet, and the filter bag being connected to the flange via a clamp.

[0011] Furthermore, the air outlet includes: an air outlet channel penetrating the top of the tank; and a limiting boss surrounding the edge of the air outlet channel and forming a support for the flange.

[0012] Furthermore, an annular sealing groove is provided on the limiting boss, and an O-ring is embedded in the annular sealing groove to seal the gap between the flange and the limiting boss.

[0013] Furthermore, a guide plate is provided inside the interlayer, and the guide plate extends spirally along the inner wall of the interlayer to guide the heating medium to flow uniformly.

[0014] The beneficial effects of this application are as follows: 1. This application provides a jacketed structure on the outer wall of the tank that can continuously heat and insulate the tank. A flange assembly is provided at the top and bottom of the jacket to allow temperature-controlled heat transfer fluid to enter and exit the jacket. By controlling the temperature of the heat transfer fluid, the internal temperature of the tank is kept constant, preventing condensation of the mixed gas due to excessively low temperatures. This solves the problem in the prior art where the mixed gas condenses due to ambient temperature, causing the condensed liquid to come into contact with silica fume, resulting in silica fume agglomeration and affecting silica fume collection.

[0015] 2. The chlorinated silane silica fume collection device of this application has the inlet located on the bottom surface of the jacket and the outlet located on the top surface of the jacket. When adding temperature-controlled heat-conducting fluid into the jacket, it can ensure that the internal cavity of the jacket is filled, thereby improving the heat preservation performance. During shutdown maintenance, opening the inlet located on the bottom surface of the jacket allows the temperature-controlled heat-conducting fluid in the jacket to flow out completely, preventing the temperature-controlled heat-conducting fluid from stagnating in the jacket. At the same time, the guide plate installed on the inner wall of the jacket can guide the heating medium to flow evenly, avoiding the phenomenon of local inadequate heating.

[0016] 3. The air outlet channel of this application is located at the top of the tank. When the silica fume settles inside the tank, it has a longer travel distance, which can make full use of the gravity of the silica fume itself, assist the settling effect, and improve the collection efficiency of silica fume. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a chlorinated silane silica fume collection device according to an embodiment of this application.

[0019] Explanation of reference numerals in the attached figures: 1. Tank body; 2. Interlayer; 21. Deflector plate; 31. Liquid inlet; 32. Liquid outlet; 4. Discharge port; 5. Air intake; 6. Filter assembly; 61. Filter bag; 62. Flange; 7. Air outlet; 71. Air outlet channel; 72. Limiting boss; 721. Annular sealing groove; 722. O-ring seal. Detailed Implementation

[0020] The following will be combined with the appendix Figure 1 The embodiments of the technical solutions of this application are described in detail below. The following embodiments are only used to more clearly illustrate the technical solutions of this application, and are therefore merely examples and should not be used to limit the scope of protection of this application. Furthermore, the technical features involved in the various embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0021] Implementation Method 1 like Figure 1This embodiment illustrates a chlorosilane-containing silica ash collection device, comprising a tank 1 and a jacket 2 fitted onto its outer wall. A temperature-controlled heat-conducting fluid, such as heat-conducting oil, flows into the jacket 2, forming a heat-insulating channel. This channel also has an inlet 31 at the bottom of the jacket 2 and an outlet 32 ​​at the top. A circulation loop is formed between the outlet 32 ​​and the inlet 31. When the mixed gas enters the tank 1 through the inlet 5, the jacket 2 maintains the tank temperature above the chlorosilane condensation point through heat conduction. Specifically, the continuous circulation of the heat-conducting fluid, coupled with the spiral guide plate 21 on the inner wall of the jacket 2, creates a uniform vortex, preventing localized temperature fluctuations and thus preventing the chlorosilane components in the mixed gas from condensing into liquid, and avoiding contact and agglomeration of the silica ash with the condensate.

[0022] Implementation Method 2 like Figure 1 This illustration depicts a chlorosilane-containing silica fume collection device according to this application. This embodiment focuses on the cooperative structure of the flange assembly 3 and the guide plate 21. The inlet 31 is located on the bottom surface of the jacket 2, and the outlet 32 ​​is located on the top surface, forming an upward fluid path. During shutdown maintenance, opening the inlet 31 completely drains the heat-conducting fluid from the jacket 2. The guide plate 21 extends spirally along the inner wall of the jacket 2, guiding the fluid to form a rotating flow, eliminating the laminar boundary layer, and reducing the axial temperature difference of the tank 1. This structure ensures uniform heating of the tank 1 by the jacket 2 through forced convection heat transfer, avoiding localized overheating or insulation failure caused by fluid stagnation.

[0023] Implementation Method 3 like Figure 1 This illustration depicts a chlorosilane-containing silica fume collection device of this application. The air inlet 5 is located at the top of the tank 1, forming a vertical airflow path with the open end of the filter bag 61 of the filter assembly 6. After the mixed gas enters from the top, it settles naturally under gravity. Large silica fume particles fall directly into the outlet 4, while fine particles are filtered by the filter bag 61. The filter bag 61 is rigidly connected to the flange 62 via a clamp. The bottom of the flange 62 is supported by a limiting boss 72 at the air outlet 7, and an O-ring 722 on the boss 72 ensures airtightness. This arrangement extends the gas travel distance within the tank 1, fully utilizing the gravity of the silica fume to assist settling and improve filtration efficiency, while simultaneously preventing damage to the filter bag 61 from direct gas scouring.

[0024] In the description of the embodiments of this application, the technical terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0025] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "set," "equipped with," "connected," and "installed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for collecting silica fume containing chlorosilane, characterized in that, include: Tank body (1); A jacket (2) is fitted on the outer wall of the tank (1) to continuously heat and keep the tank (1) warm; The discharge port (4) is located at the bottom of the tank (1); An air inlet (5) is provided on the tank (1); A filter assembly (6) is disposed on the top of the tank (1) and extends into the tank (1). The filter assembly (6) is provided with an air outlet (7) at its top.

2. The chlorinated silane silica fume collection device according to claim 1, characterized in that, The interlayer (2) forms a heat-insulating channel, which also has an inlet (31) at the bottom of the interlayer (2) and an outlet (32) at the top of the interlayer (2).

3. The chlorinated silane silica fume collection device according to claim 1, characterized in that, The air inlet (5) is located on the top of the tank (1).

4. The chlorinated silane silica fume collection device according to claim 1, characterized in that, The filter assembly (6) includes: a filter bag (61) extending into the tank (1), a flange (62) fitted onto the open end of the filter bag (61) and connected to the air outlet (7), and the filter bag (61) being connected to the flange (62) by a clamp.

5. The chlorinated silane silica fume collection device according to claim 4, characterized in that, The air outlet (7) includes: an air outlet channel (71) penetrating the top of the tank (1); and a limiting boss (72) surrounding the edge of the air outlet channel (71) and forming a support for the flange (62).

6. The chlorinated silane silica fume collection device according to claim 5, characterized in that, The limiting boss (72) is provided with an annular sealing groove (721), and an O-ring (722) is embedded in the annular sealing groove (721) to seal the gap between the flange (62) and the limiting boss (72).

7. The chlorinated silane silica fume collection device according to claim 1, characterized in that, A flow guide plate (21) is provided inside the interlayer (2), and the flow guide plate (21) extends spirally along the inner wall of the interlayer (2) to guide the heating medium to flow uniformly.

Images