Gas cooling mechanism for polycrystalline silicon production

Abstract

The utility model provides a gas cooling mechanism for polycrystalline silicon production, which relates to the technical field of silicon powder production gas treatment and comprises a first exhaust pipe of a compressor; an inlet and an outlet are formed in the opposite side walls of the shell, an air inlet pipe passing through the inlet and a second exhaust pipe passing through the outlet are arranged in the shell, and the air inlet pipe is communicated with the first exhaust pipe; a cooling assembly communicating with the air inlet pipe and the second exhaust pipe is arranged in the shell, and a ventilation opening is further formed in the side wall of the shell. And the air inlet end of the condenser communicates with the second exhaust pipe. According to the air cooling system, air exhausted by the compressor can be subjected to air cooling treatment, so that the refrigerating heat load of the condenser is reduced, and the operation cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gas treatment for silicon powder production, in particular to a gas cooling mechanism for polysilicon production. Background Art

[0002] Compressors are used in the production process of polysilicon to compress gas, compress air sources, and provide compressed hydrogen to hydrogen production equipment. A compressor is a driven fluid machinery that raises low-pressure gas to high-pressure gas. The compressor compresses hydrogen involved in the production process in order to reduce the oxides on the surface of the polysilicon crystals into pure silicon. This method is called hydrogen cooling, but the cooling of hydrogen requires additional cooling treatment after the compressor compression process in order to cool the gas compressed and discharged by the compressor. Therefore, a condenser is used. The condenser is directly connected to the exhaust pipe of the compressor, and cools the compressed gas. After the exhaust gas is compressed by the compressor, the temperature of the gas discharged from the exhaust port of the compressor is about 75°C. After being discharged from the compressor, the gas will directly enter the condenser, and be cooled by the refrigerant medium in the condenser. After the temperature drops to -18°C, it is recovered. In this process, due to the large temperature difference between the exhaust gas when passing through the compressor and the condenser, the heat load of the condenser increases. It is necessary to increase the number of condensers to reduce the high heat load caused by the exhaust gas, which leads to increased costs and accelerated losses of the compressor and condenser. Utility Model Content

[0003] In order to solve the problem that the temperature of the exhaust gas changes too much when passing through the compressor and the condenser, resulting in an increase in the heat load of the condenser, which increases the number of operations of the condenser and increases the energy loss, the utility model provides a gas cooling mechanism for polysilicon production, which can perform air cooling and temperature reduction treatment on the gas discharged by the compressor to reduce the refrigeration heat load of the condenser and reduce the operating cost.

[0004] The technical solution adopted by the utility model is:

[0005] A gas cooling mechanism for polysilicon production is provided, comprising:

[0006] A first exhaust pipe of the compressor;

[0007] A shell, an inlet and an outlet are provided on opposite side walls of the shell, an air intake pipe passing through the inlet and a second exhaust pipe passing through the outlet are provided inside the shell, and the air intake pipe is connected to the first exhaust pipe; a cooling component connecting the air intake pipe and the second exhaust pipe is provided inside the shell, and a vent is provided on the side wall of the shell;

[0008] A condenser, wherein an air inlet end of the condenser is communicated with the second exhaust pipe.

[0009] In some embodiments of the utility model, the cooling component includes a first connecting plate, a second connecting plate and a first connecting pipe, the first connecting plate and the second connecting plate are both arranged inside the shell, the first connecting plate is provided with a first cavity connected to the intake pipe, and the side wall of the first connecting plate is provided with a first opening connected to the first cavity; the second connecting plate is provided with a second cavity connected to the second exhaust pipe, and the side wall of the second connecting plate is provided with a second opening connected to the second cavity; the first connecting pipe is located between the first connecting plate and the second connecting plate, and both ends of the first connecting pipe are respectively connected to the first opening and the second opening.

[0010] In some embodiments of the present utility model, a plurality of second connecting pipes are connected between the first exhaust pipe and the intake pipe, and a first gap is provided between adjacent second connecting pipes.

[0011] In some embodiments of the present invention, the cross section of each second connecting pipe is in the shape of a Chinese character "J", and the plurality of second connecting pipes are distributed in a ring shape along the central axis of the first exhaust pipe.

[0012] In some embodiments of the present invention, a plurality of fins are disposed on the outer wall of each first connecting tube, and a second gap is provided between adjacent fins.

[0013] In some embodiments of the utility model, multiple vents are respectively arranged on opposite side walls of the shell, and a fan is provided inside each vent. The wind direction of the fan on the side wall on one side is toward the fins, and the wind direction of the fan on the side wall on the other side is toward the outside of the shell.

[0014] In some embodiments of the present invention, each first connecting pipe and the inner bottom of the shell have a third gap.

[0015] In some embodiments of the present invention, the central axis of each fan and the central axis of each first connecting pipe are in the same plane.

[0016] The beneficial effects of the utility model are:

[0017] 1. After being compressed by the compressor, the gas discharged in the production of polysilicon enters the intake pipe through the first exhaust pipe. The intake pipe is located at the inlet of the shell and is used to connect the compressor and the shell so that the gas can enter the cooling component in the shell for pre-cooling treatment. The gas after pre-cooling treatment is discharged through the second exhaust pipe connected to the cooling component at the other end of the shell, and then enters the condenser for the final cooling treatment, which avoids the compressor directly transporting the high-temperature gas to the condenser through the first exhaust pipe after compressing the gas, thereby increasing the energy consumption of the condenser and reducing the refrigeration heat load of the condenser;

[0018] 2. By opening a plurality of vents on the shell, the inside of the shell is connected with the outside, so that the internal gas flowability of the shell is increased, and it is convenient to dissipate the heat of the gas passing through the cooling components inside the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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 embodiments or the description of the prior art 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 creative work.

[0020] Figure 1 It is a schematic diagram of the composition of the cooling mechanism;

[0021] Figure 2 Schematic diagram of the cooling component structure in the cooling mechanism Figure 1 ;

[0022] Figure 3 Schematic diagram of the cooling component structure in the cooling mechanism Figure 2 ;

[0023] Figure 4 It is a three-dimensional schematic diagram of the second connecting pipe.

[0024] Reference numerals:

[0025] 1- compressor, 10- first exhaust pipe, 2- condenser, 3- shell, 30- inlet, 31- outlet, 32- air inlet pipe, 33- second exhaust pipe, 34- first connecting plate, 35- second connecting plate, 36- vent, 37- fan, 38- first connecting pipe, 39- fin, 4- second connecting pipe. DETAILED DESCRIPTION

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention.

[0028] The embodiments of the utility model are described in detail below with reference to the accompanying drawings. Example

[0029] like Figure 1 As shown, this embodiment provides a gas cooling mechanism for polysilicon production, comprising:

[0030] A first exhaust pipe 10 of the compressor 1;

[0031] The shell 3 has an inlet 30 and an outlet 31 on opposite side walls of the shell 3. An air intake pipe 32 passing through the inlet 30 and a second exhaust pipe 33 passing through the outlet 31 are respectively provided inside the shell 3, and the air intake pipe 32 is connected to the first exhaust pipe 10. A cooling component connecting the air intake pipe 32 and the second exhaust pipe 33 is provided inside the shell 3, and a vent 36 is also provided on the side wall of the shell 3.

[0032] The condenser 2 has an air inlet end connected to the second exhaust pipe 33 .

[0033] The condenser 2 is specifically a cascade condenser, and its working principle is to use the evaporation and condensation process of the refrigerant at different temperatures to absorb and release heat to achieve a refrigeration effect. The compressor 1 is used to compress the gas. After the compression is completed, the high-temperature and high-pressure compressed gas will be discharged through the first exhaust pipe 10 and used for the production of polysilicon. The opening position of the vent 36 is located on the side walls of the inlet 30 and the outlet 31 opened on different shells 3, that is, on another pair of opposite side walls of the shell 3. The vent 36 is used to connect the internal space of the shell 3 with the outside world, so as to realize the circulation exchange of air.

[0034] When in use, after the compressor 1 completes the compression of the gas, the compressed gas will enter the intake pipe 32 connected thereto through the first exhaust pipe 10, and the intake pipe 32 will then pass the compressed gas into the cooling component located in the shell 3 for cooling treatment, that is, the high-temperature and high-pressure gas generated by the compressor 1 can be cooled in advance to prevent the compressed gas from directly entering the condenser 2 in a high-temperature and high-pressure state. The compressed gas after the cooling treatment by the cooling component is discharged to the second exhaust pipe 33 through the second connecting plate 35, and finally enters the condenser 2 to complete the cooling treatment, thereby preventing the condenser 2 from directly contacting the high-temperature and high-pressure compressed gas, thereby increasing the refrigeration heat load of the condenser 2, reducing the number of operations of the condenser 2, and reducing the energy consumption of the condenser 2.

[0035] Further, such as Figure 1-3 As shown, the cooling component includes a first connecting plate 34, a second connecting plate 35 and a first connecting pipe 38. The first connecting plate 34 and the second connecting plate 35 are both arranged inside the shell 3. The first connecting plate 34 is provided with a first cavity connected to the intake pipe 32, and a first opening connected to the first cavity is provided on the side wall of the first connecting plate 34; the second connecting plate 35 is provided with a second cavity connected to the second exhaust pipe 33, and a second opening connected to the second cavity is provided on the side wall of the second connecting plate 35; the first connecting pipe 38 is located between the first connecting plate 34 and the second connecting plate 35, and both ends of the first connecting pipe 38 are respectively connected to the first opening and the second opening.

[0036] The first connecting plate 34 is arranged on the inner bottom of the shell 3 near the inlet 30, and the second connecting plate 35 is arranged on the inner bottom of the shell 3 near the outlet 31. The first connecting plate 34 and the second connecting plate 35 are parallel to the same side wall of the shell 3, and the first connecting plate 34 and the second connecting plate 35 are distributed along the length direction of the shell 3. There is a gap between the first connecting plate 34 and the second connecting plate 35, and the gap is used to place the first connecting pipe 38. The first opening is formed at one end of the first connecting plate 34 facing the second connecting plate 35, the second opening is formed at one end of the second connecting plate 35 facing the first connecting plate 34, and the first connecting plate 34 has a first cavity connected to the first opening inside, which is used to connect the air intake pipe 32 and the first opening, and the second connecting plate 35 has a second cavity connected to the second opening inside, which is used to connect the second exhaust pipe 33 and the second cavity, and the first connecting pipe 38 is connected between the first opening on the first connecting plate 34 and the second opening on the second connecting plate 35, which is used to cool the compressed gas discharged from the first exhaust pipe 10 and then discharge it to the inside of the condenser 2 through the second exhaust pipe 33 for the final cooling treatment. The multiple first connecting pipes 38 located between the first connecting plate 34 and the second connecting plate 35 are distributed along the length direction of the first connecting plate 34, and there is a spacing between adjacent first connecting pipes, which facilitates the heat transferred on the first connecting pipe 38 to be dissipated to avoid heat accumulation.

[0037] When in use, after completing gas compression, the compressor 1 discharges the compressed gas into the first cavity on the first connecting plate 34 through the first exhaust pipe 10, and then enters the first connecting pipe 38 from the multiple first openings opened on the other side of the first connecting plate 34. The compressed gas entering the first connecting pipe 38 transfers heat to the first connecting pipe 38, and the first connecting pipe 38 and the air temperature in the shell 3 are heat exchanged to achieve pre-cooling treatment of the compressed gas. After the heat exchange treatment on the first connecting pipe 38, the compressed gas enters the second cavity on the second connecting plate 35 through the second opening opened on the second connecting plate 35, and finally gathers into the second exhaust pipe 33 connected to the other side of the second connecting plate 35 and is discharged, completing the pre-cooling treatment of the compressed gas.

[0038] Further, such as Figure 1 and Figure 4 As shown, a plurality of second connecting pipes 4 are connected between the first exhaust pipe 10 and the intake pipe 32 , and a first gap is provided between adjacent second connecting pipes 4 .

[0039] When in use, the first exhaust pipe 10 passes the gas compressed and discharged by the compressor 1 into the second connecting pipe 4, and the heat of the compressed gas is transferred to the first exhaust pipe 10. The first exhaust pipe 10 is in direct contact with the outside air. Therefore, the heat on the first exhaust pipe 10 can achieve heat exchange with the external atmospheric environment, and the heat on the second connecting pipe 4 can be dissipated to the outside, thereby realizing pre-cooling treatment of the compressed gas.

[0040] Further, such as Figure 4 As shown, the cross section of each second connecting pipe 4 is in the shape of a Chinese character “J”, and the plurality of second connecting pipes 4 are distributed in a ring shape along the central axis of the first exhaust pipe 10 .

[0041] The cross section of the second connecting pipe 4 is in the shape of a Chinese character "J", and the convex part of the second connecting pipe 4 is arranged along the direction in which the radius of the first exhaust pipe 10 gradually increases. A plurality of second connecting pipes 4 are distributed on the first exhaust pipe 10 in a circular array based on the central axis of the first exhaust pipe 10, and are connected to the first exhaust pipe 10. There is a second gap between adjacent second connecting pipes 4, and the second gap can enhance the air flow between the second connecting pipes 4. The gas compressed by the compressor 1 enters the second connecting pipe 4, and the second connecting pipe 4 contacts the air in the atmospheric environment and realizes heat exchange, thereby achieving pre-cooling treatment of the compressed gas.

[0042] When in use, the compressor 1 compresses the gas into the second connecting pipe 4 through the first exhaust pipe 10, and the compressed gas transfers the heat to the second connecting pipe 4. The second connecting pipe 4 then realizes heat exchange with the external atmospheric environment to dissipate the heat on the second connecting pipe 4, thereby pre-cooling the compressed gas in advance.

[0043] Further, such as Figure 1 and Figure 2 As shown, a plurality of fins 39 are provided on the outer wall of each first connecting tube 38 , and a second gap is provided between adjacent fins 39 .

[0044] The fins 39 are arranged on the outer wall of the first connecting tube 38 and face the top side of the shell 3. The fins 39 are metal sheets with strong thermal conductivity and are used to increase the heat exchange surface area of ​​the first connecting tube 38. A second gap is required between adjacent fins 39. The second gap facilitates air circulation between adjacent fins 39, which is beneficial for the fins 39 to dissipate heat from the first connecting tube 38.

[0045] When in use, the first connecting pipe 38 passes through the high-temperature compressed gas discharged by the compressor 1, and the first connecting pipe 38 absorbs the heat of the compressed gas and transfers the heat to the fins 39. The fins 39 then dissipate the heat to the air inside the shell 3, and finally exchange heat with the relatively low-temperature air outside through the vents 36 provided on the shell 3. It is worth noting that the fins 39 are not set on the outer wall of the first connecting pipe 38 facing the inner bottom of the shell 3. Since the two ends of the first connecting pipe 38 need to be connected to the first connecting plate 34 and the second connecting plate 35, there is a gap between the first connecting pipe 38 and the inner bottom of the shell 3. The air circulation in the gap is poor. If the fins 39 extend to the outer wall of the first connecting pipe 38 facing the inner bottom of the shell 3, it is easy to cause heat to accumulate on the inner bottom of the shell 3, which is not conducive to heat dissipation.

[0046] Further, such as Figure 1-3 As shown, a plurality of vents 36 are respectively arranged on opposite side walls of the shell 3, and a fan 37 is provided inside each vent 36. The wind direction of the fan 37 on the side wall on one side is toward the fin 39, and the wind direction of the fan 37 on the side wall on the other side is toward the outside of the shell 3.

[0047] There are at least two vents 36, which are respectively arranged on opposite side walls of the housing 3. The positions of the vents 36 on the opposite side walls correspond to each other, and the opening directions of the vents 36 are all toward the first connecting pipe 38. A fan 37 is arranged on the vent 36, and the fan 37 in the vent 36 on one side wall blows toward the first connecting pipe 38 in the housing 3, and the fan 37 in the vent 36 on the other opposite side wall blows toward the outside of the housing 3, so that the internal air of the housing 3 circulates, that is, because the gas temperature of the compressed gas discharged from the first exhaust pipe 10 is relatively high, and is about 75°C, and the air circulation direction formed by the fan 37 on the opposite side wall of the housing 3 can achieve the effect of cooling the temperature inside the housing 3 through the natural temperature outside the housing 3, that is, using the atmospheric environment temperature for cooling, and the summer temperature when the atmospheric environment temperature is relatively high is usually between 10-35°C, and the east-west temperature when the temperature is relatively low is usually between -30-0°C, which can achieve the effect of cooling the first connecting pipe 38 in the housing 3 while improving the air flow.

[0048] When in use, the fans 37 on the opposite side walls operate simultaneously, so that air circulation is formed between the interior of the shell 3 and the outside, and the internal temperature of the shell 3, which is relatively higher than the outside temperature, is cooled down by the outside atmospheric temperature, thereby further reducing the temperature of the compressed gas from the compressor 1 when it reaches the condenser 2, thereby reducing the refrigeration heat load of the condenser 2.

[0049] Further, such as Figure 3 As shown, each first connecting pipe 38 has a third gap with the inner bottom of the shell 3 .

[0050] The first connecting tube 38 located between the first connecting plate 34 and the second connecting plate 35 is not in contact with the inner bottom of the shell 3, that is, a third gap is left between the first connecting tube 38 and the inner bottom of the shell 3, so that the heat emitted from the first connecting tube 38 can be discharged from the upper and lower ends, thereby enhancing the air circulation around the first connecting tube 38.

[0051] When in use, a third gap is left between the first connecting tube 38 and the inner bottom of the shell 3. The third gap can enhance the air flow around the first connecting tube 38, and prevent the heat on the first connecting tube 38 from accumulating at the bottom of the first gap between adjacent first connecting tubes 38 after being dissipated, so that the heat dissipation effect of the first connecting tube 38 is reduced, affecting the cooling treatment of the compressed gas.

[0052] Further, such as Figure 3 As shown, the central axis of each fan 37 and the central axis of each first connecting pipe 38 are in the same plane.

[0053] The central axis of the second connecting tube 4 and the central axis of the fan 37 intersect, and the plane where these two intersecting axes lie is perpendicular to the side wall of the shell 3. At this time, the fan 37 can blow wind to the top and bottom of the first connecting tube 38. When the wind of the fan 37 blows to the top of the first connecting tube 38, the heat conducted and dissipated by the fins 39 on the first connecting tube 38 can be blown away; when the wind of the fan 37 blows to the bottom of the first connecting tube 38, the heat dissipated to the third gap on the bottom of the shell 3 through the first connecting tube 38 can be blown away, thereby avoiding heat accumulation and reducing the heat dissipation effect.

[0054] When in use, the fan 37 arranged on one of the side walls blows the natural temperature wind from the outside into the interior of the shell 3. The wind direction of the fan 37 on the side wall is directed towards the first connecting pipe 38, which can take away the heat dissipated from the fins 39 on the first connecting pipe 38 and cool the first connecting pipe 38. The side wall opposite to the other side of the side wall blows the blown heat out from the vent 36 by running the fan 37, so that air circulation is achieved inside the shell 3, avoiding heat accumulation inside the shell 3 and affecting the cooling of the compressed gas.

[0055] 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 have various modifications and variations. In the absence of conflicts, the embodiments of the present application and the features in the embodiments may be arbitrarily combined with each other. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gas cooling mechanism for polysilicon production, characterized in that: include: A first exhaust pipe of the compressor; A shell, wherein an inlet and an outlet are provided on opposite side walls of the shell, an air intake pipe passing through the inlet and a second exhaust pipe passing through the outlet are provided inside the shell, and the air intake pipe is connected to the first exhaust pipe; a cooling component connecting the air intake pipe and the second exhaust pipe is provided inside the shell, and a vent is also provided on the side wall of the shell; A condenser, wherein an air inlet end of the condenser is connected to the second exhaust pipe.

2. A gas cooling mechanism for polysilicon production according to claim 1, characterized in that: The cooling component includes a first connecting plate, a second connecting plate and a first connecting pipe, the first connecting plate and the second connecting plate are both arranged inside the shell, the first connecting plate is provided with a first cavity connected to the intake pipe, and the side wall of the first connecting plate is provided with a first opening connected to the first cavity; the second connecting plate is provided with a second cavity connected to the second exhaust pipe, and the side wall of the second connecting plate is provided with a second opening connected to the second cavity; the first connecting pipe is located between the first connecting plate and the second connecting plate, and the two ends of the first connecting pipe are respectively connected to the first opening and the second opening.

3. A gas cooling mechanism for polysilicon production according to claim 2, characterized in that: A plurality of second communicating pipes are connected between the first exhaust pipe and the intake pipe, and a first gap is provided between adjacent second communicating pipes.

4. A gas cooling mechanism for polysilicon production according to claim 3, characterized in that: The cross section of each of the second connecting pipes is in the shape of a Chinese character "J", and the plurality of the second connecting pipes are distributed in a ring shape along the central axis of the first exhaust pipe.

5. The gas cooling mechanism for polysilicon production according to claim 2, characterized in that: A plurality of fins are arranged on the outer wall of each of the first connecting tubes, and a second gap is provided between adjacent fins.

6. A gas cooling mechanism for polysilicon production according to claim 5, characterized in that: The plurality of vents are respectively arranged on opposite side walls of the shell, each of which is provided with a fan inside, and the wind direction of the fan on the side wall on one side is toward the fins, and the wind direction of the fan on the side wall on the other side is toward the outside of the shell.

7. A gas cooling mechanism for polysilicon production according to claim 6, characterized in that: Each of the first communicating tubes and the inner bottom of the shell has a third gap.

8. A gas cooling mechanism for polysilicon production according to claim 7, characterized in that: The central axis of each of the fans and the central axis of each of the first connecting pipes are in the same plane.

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