Washing device and polycrystalline silicon production system

Abstract

The utility model discloses a washing device and a polycrystalline silicon production system. The washing device comprises a washing unit with a cavity and a driving unit, a washing liquid outlet of the washing unit is communicated with a washing liquid inlet of the washing unit through the driving unit, and the elevation of the washing liquid inlet of the washing unit is higher than that of the washing liquid outlet of the washing unit; the washing unit comprises a washing tower, a flow guide hose comprising a fixed end and a free end is arranged in the washing tower, the fixed end of the flow guide hose is communicated with a washing liquid outlet of the washing unit, and a floating ball is arranged at the free end of the flow guide hose. The washing device provided by the utility model has the characteristics of difficulty in blockage and longer continuous operation time.

Description

Technical Field

[0001] The utility model relates to a washing device and a polysilicon production system, belonging to the field of applied chemical industry. Background Art

[0002] At present, the mainstream polysilicon production process in China adopts the modified Siemens method, which uses hydrogen to reduce gaseous trichlorosilane in the reduction furnace, and chemically deposits the trichlorosilane on the silicon core in the reduction furnace to generate rod-shaped polysilicon. The reduction furnace production process is an intermittent operation, and the furnace needs to be opened regularly to unload the polysilicon rods and install the silicon core. Before the reduction furnace stops depositing and opens the furnace, it is necessary to use nitrogen to replace the gas in the reduction furnace multiple times. The nitrogen containing silicon powder obtained by the replacement enters the washing tower, and water is used in the washing tower for spray washing.

[0003] In the prior art, washing liquid is usually extracted from the bottom of the washing tower and pumped into the top of the washing tower by a circulating pump for spray washing. However, since the washing liquid contains silicon powder, the washing tower has the disadvantages of easy blockage of the circulation pipeline and short continuous operation time.

[0004] Therefore, developing a washing device that is not easy to clog and has a long continuous operation time has become a research direction. Utility Model Content

[0005] The utility model provides a washing device which has the characteristics of being not easily blocked and having a long continuous operation time.

[0006] The utility model also provides a polysilicon production system, which has the characteristic of long continuous operation time.

[0007] The utility model provides a washing device, which comprises a washing unit with a cavity and a driving unit;

[0008] The washing liquid outlet of the washing unit is connected to the washing liquid inlet of the washing unit through the driving unit, and the washing liquid inlet of the washing unit is at a higher elevation than the washing liquid outlet of the washing unit;

[0009] The washing unit comprises a washing tower, in which a guide hose comprising a fixed end and a free end is arranged, the fixed end of the guide hose is communicated with a washing liquid outlet of the washing unit, and a float is arranged at the free end of the guide hose.

[0010] The washing device as described above, wherein the volume of the float is 0.2-0.5m 3 .

[0011] The washing device as described above, wherein the nominal diameter of the flow guiding hose is DN50-DN200.

[0012] The washing device as described above, wherein the washing device further comprises an elbow pipe fitting connected to the free end, and the free end of the elbow pipe fitting is directed away from the liquid surface of the washing liquid.

[0013] The washing device as described above, wherein the angle of the elbow pipe fitting is 90°-135°.

[0014] The washing device as described above, wherein the angle of the elbow pipe is 90°.

[0015] In the washing device as described above, the free end of the diversion hose is provided with a filter screen with a filtering accuracy of 40-100 meshes.

[0016] The washing device as described above, wherein the washing device further comprises a sedimentation unit, and the washing liquid outlet of the washing unit is connected to the washing liquid inlet of the washing unit through the sedimentation unit and the driving unit in sequence;

[0017] The precipitation unit comprises N precipitation chambers which are connected in sequence, and at least one precipitation chamber silicon powder discharge port is arranged at the bottom of each precipitation chamber, and N≥2.

[0018] The washing device as described above, wherein the washing device further comprises a nitrogen supply unit, a reduction unit and a water replenishment unit, wherein the nitrogen supply unit is connected to the replacement gas inlet of the washing unit through the reduction unit, and the replenishment water outlet of the water replenishment unit is connected to the replenishment water inlet of the washing unit.

[0019] The utility model also provides a polysilicon production system, which comprises any one of the above-mentioned washing devices.

[0020] The washing device provided by the utility model has the characteristics of being not easy to be blocked and having a long continuous operation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model 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 one by one below. Obviously, the drawings in the following description are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 A structural diagram of a first washing device provided in the first aspect of the utility model;

[0023] Figure 2 for Figure 1 Equipment diagram of the washing device shown;

[0024] Figure 3An equipment diagram of a second washing device provided by the utility model;

[0025] Figure 4 The equipment diagram of the third washing device provided by the utility model;

[0026] Figure 5 A structural diagram of a fourth washing device provided by the utility model;

[0027] Figure 6 for Figure 5 Equipment diagram of the washing unit shown.

[0028] Description of reference numerals:

[0029] A-nitrogen supply unit;

[0030] A1-Plant nitrogen source;

[0031] B-reduction unit;

[0032] B1-reduction furnace;

[0033] C-washing unit;

[0034] C1-wash tower;

[0035] C11- diversion hose;

[0036] C12-Float;

[0037] C13-90° elbow fittings;

[0038] C14-filter;

[0039] D-precipitation unit;

[0040] D1- Sedimentation tank;

[0041] D11-first precipitation chamber;

[0042] D12-second precipitation chamber;

[0043] E-drive unit;

[0044] E1-centrifugal pump;

[0045] F-water replenishment unit;

[0046] F1-factory washing water source. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to better understand the scheme of the utility model, the utility model is further described in detail below. The specific implementation methods listed below are only for describing the principles and features of the utility model. The examples are only used to explain the utility model and do not limit the scope of the utility model. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0048] Figure 1 A structural diagram of a washing device provided in the first aspect of the utility model, such as Figure 3 As shown, the washing device comprises a C-washing unit having a cavity and an E-driving unit;

[0049] The washing liquid outlet of the C-washing unit is connected to the washing liquid inlet of the C-washing unit through the E-driving unit, and the washing liquid inlet of the C-washing unit is at a higher elevation than the washing liquid outlet of the C-washing unit;

[0050] The C-washing unit comprises a C1-washing tower, in which a C11-guiding hose comprising a fixed end and a free end is arranged, the fixed end of the C11-guiding hose is connected to the washing liquid outlet of the C-washing unit, and the free end of the C11-guiding hose is provided with a C12-float.

[0051] The C-washing unit is used to wash the object to be processed. Specifically, the object to be processed enters the cavity of the C-washing unit, and the washing liquid moves in the cavity along the direction of gravity to wash the object to be processed.

[0052] The C-washing unit includes a washing liquid inlet and a washing liquid outlet, wherein the washing liquid inlet is at a higher elevation than the washing liquid outlet. The washing liquid enters the C-washing unit from the washing liquid inlet, moves in the direction of gravity, washes the objects to be processed during the movement, and leaves the C-washing unit from the washing liquid outlet.

[0053] The E-drive unit is used to drive the washing liquid, specifically, to drive the washing liquid to be transported from the washing liquid outlet of the C-washing unit at a lower elevation to the washing liquid inlet of the C-washing unit. The utility model does not limit the specific equipment selection of the E-drive unit. In one embodiment, the E-drive unit is an E1-centrifugal pump. The setting of the E-drive unit can realize the circulation of the washing liquid of the C-washing unit.

[0054] The present invention does not limit the connection method between the washing liquid outlet of the C-washing unit, the E-driving unit, and the washing liquid inlet of the C-washing unit. In one embodiment, a pipeline connection is used.

[0055] In one embodiment, the C-washing unit comprises a C1-washing tower. It is well known in the art that the C1-washing tower contains a cavity, and in this embodiment, the inner space of the C1-washing tower is the washing device cavity, the washing liquid inlet of the C1-washing tower is the washing liquid inlet of the C-washing unit, and the washing liquid outlet of the C1-washing tower is the washing liquid outlet of the C-washing unit.

[0056] Figure 2 for Figure 1 The equipment diagram of the device shown. Figure 2 As shown, Figure 2 It includes C1-washing tower and E1-centrifugal pump. Among them, C1-washing tower is provided with C11-flow guiding hose including fixed end and free end, the fixed end of C11-flow guiding hose is connected with the washing liquid outlet of C-washing unit, and the free end of C11-flow guiding hose is provided with C12-floating ball.

[0057] The function of the C11-diversion hose is to send the washing liquid in the C1-washing tower out of the C-washing unit through the washing liquid outlet of the C-washing unit. The C11-diversion hose includes a fixed end and a free end, and the fixed end and the free end are two end faces of a C11-diversion hose. Among them, the fixed end of the C11-diversion hose is connected to the washing liquid outlet of the C-washing unit, and the free end of the C11-diversion hose is not fixed and is provided with a C12-float. The C12-float is a structure including a cavity, and the cavity is filled with gas. When the C12-float is placed in the liquid, it can float on the liquid surface. When the free end of the C11-guiding hose is provided with a C12-float, the C12-float can make the free end of the C11-guiding hose be located near the liquid surface, so that the liquid near the liquid surface enters the C11-guiding hose through the free end of the C11-guiding hose, and leaves the C-washing unit through the washing liquid outlet of the C-washing unit connected to the fixed end of the C11-guiding hose, passes through the E-driving unit, and enters the C1-washing tower from the washing liquid inlet of the C-washing unit, completing the circulation of the washing liquid.

[0058] When the object to be treated is a gas containing water-insoluble solid impurities, this part of the solid impurities enters the washing liquid and is deposited at the bottom of the washing liquid. When the washing liquid is extracted from the bottom of the washing liquid, the solid impurities are easily sucked into the E-drive unit, causing equipment wear and pipeline blockage. When the C11-guide hose and C12-float are set in the C1-washing tower, the C12-float can make the free end of the C11-guide hose absorb the washing liquid from near the liquid surface. Since the solid impurities are deposited at the bottom of the washing liquid, absorbing the washing liquid from near the liquid surface can reduce the amount of solid impurities entering the E-drive unit and its affiliated pipelines, reduce the probability of pipeline blockage and equipment damage, and make the washing device provided by the utility model have a longer continuous operation time and lower operating costs.

[0059] The washing device provided by the utility model is not limited to the type of the object to be treated, and the device is particularly suitable for washing gas containing water-insoluble solids. In one embodiment, the object to be treated is nitrogen containing silicon powder.

[0060] It can be understood that, in order to discharge the solid impurities deposited in the C1-washing tower, in one embodiment, at least one solid impurity discharge port is provided at the bottom of the C1-washing tower.

[0061] In one embodiment, the C12-float is filled with nitrogen with a volume of 0.2-0.5m 3 Nitrogen is inert and will not react with the material to be treated in the C1-washing tower when leaking; within the above volume range, the C12-float can generate sufficient buoyancy in the washing liquid, so that the free end of the C11-diversion hose floats near the liquid surface, and the washing liquid containing less solid impurities near the liquid surface enters the C11-diversion hose, further reducing the probability of pipeline blockage and equipment damage, so that the washing device provided by the utility model has a longer continuous operation time and lower operating costs.

[0062] Furthermore, in one embodiment, the nominal diameter of the C11-flow-guiding hose is DN50-DN200. The C11-flow-guiding hose meeting the above characteristics can better achieve a balance between flow capacity and weight, so that the washing liquid can circulate more quickly through the flow-guiding hose.

[0063] Figure 3 The equipment diagram of the second washing device provided by the utility model is as follows: Figure 3 As shown, the washing device also includes an elbow pipe connected to the free end, and the free end of the elbow pipe is oriented away from the washing liquid surface. In one embodiment, the angle of the elbow pipe is 90-135°. The elbow pipe is a pipe that matches the size of the C11-diversion hose and can change the pipeline offset angle. The elbow pipe has two end faces: a fixed end and a free end, wherein the fixed end is connected to the free end of the C11-diversion hose, and the free end is not fixed. The direction of the free end of the elbow pipe away from the washing liquid surface means that the ray emitted from the center of the cross section of the free end of the elbow pipe away from the elbow pipe does not intersect with the liquid surface, but intersects with the bottom and part of the side wall of the C1-washing tower below the liquid surface. This setting direction allows the C11-diversion hose to extract the washing liquid below the liquid surface, while preventing the air above the liquid surface from entering the C11-diversion hose from the free end of the C11-diversion hose, so that the C1-washing tower has a better washing effect. In one embodiment, the angle of the elbow pipe is 90°. The free end of the C13-90° elbow pipe is parallel to the liquid surface and away from the liquid surface of the washing liquid, which can further reduce the air entering the C11-guiding hose and improve the washing effect of the C1-washing tower.

[0064] Furthermore, in one embodiment, the free end of the C11-flow guiding hose is provided with a C14-filter with a filtering accuracy of 40-100 meshes. The C14-filter can intercept solid impurities, further reducing the amount of solid impurities entering the C11-flow guiding hose, so that the washing device provided by the utility model has a longer continuous operation time and a lower operating cost.

[0065] In one embodiment, the washing device provided by the utility model further includes a D-precipitation unit, and the washing liquid outlet of the C-washing unit is connected to the washing liquid inlet of the C-washing unit through the D-precipitation unit and the E-driving unit in sequence.

[0066] The D-precipitation unit receives the washing liquid obtained after washing the object to be treated. The washing liquid leaves the C-washing unit through the washing liquid outlet of the C-washing unit and enters the D-precipitation unit through the washing liquid inlet of the D-precipitation unit for precipitation treatment. The washing liquid containing solid impurities enters the D-precipitation unit, where the solid impurities settle under the action of gravity, completing the separation process from the washing liquid.

[0067] The present invention does not limit the specific equipment selection of the D-precipitation unit. In one embodiment, the D-precipitation unit is a D1-precipitation tank.

[0068] The washing liquid obtained after the solid impurities are precipitated enters the C-washing unit again through the washing liquid inlet of the C-washing unit under the action of the E-driving unit. Since the washing liquid inlet of the C-washing unit is at a higher elevation than the washing liquid outlet of the C-washing unit, the washing liquid re-entering the C-washing unit falls under the action of gravity and washes the replacement gas again during the falling process, and then leaves the C-washing unit through the washing liquid outlet of the C-washing unit and enters the D-precipitation unit to start the next cycle.

[0069] In one embodiment, the D-precipitation unit includes N precipitation chambers connected in sequence, each precipitation chamber is provided with at least one precipitation chamber silicon powder discharge port at the bottom, and N≥2.

[0070] The D-sedimentation unit slows down the liquid flow rate by increasing the flow area, so that the solid impurities in the washing liquid settle under the action of gravity. Providing multiple mutually connected sedimentation chambers in the D-sedimentation unit is equivalent to adding multiple baffles connected to the bottom of the D-sedimentation unit in the D-sedimentation unit. The solid impurities slide down along the baffles to the bottom of the D-sedimentation unit due to the obstruction of the baffles during the sedimentation, thereby achieving the purpose of removing the solid impurities in the washing liquid. Correspondingly, the cavity walls of the multiple sedimentation chambers are equivalent to baffles. The solid impurities are blocked by the cavity walls during the sedimentation and slide to the bottom of the sedimentation chamber. The water flows from the upper end of the sedimentation chamber into the next sedimentation chamber, completing the removal of the solid impurities.

[0071] Providing mutually interconnected sedimentation chambers in the D-sedimentation unit helps to reduce the volume of the D-sedimentation unit, reduce construction costs, and improve the solid impurity removal efficiency of the D-sedimentation unit.

[0072] Furthermore, in one embodiment, at least one solid impurity discharge port is provided at the bottom of each sedimentation chamber to discharge the solid impurities accumulated at the bottom of the sedimentation chamber, thereby improving the operation efficiency of the D-sedimentation unit.

[0073] Figure 4 This is a diagram of the third type of washing device provided by the utility model. Figure 3 As shown, N=2, the D1-sedimentation tank is provided with a D11-first sedimentation chamber and a D12-second sedimentation chamber, wherein the washing liquid inlet of the D11-first sedimentation chamber is connected to the washing liquid outlet of the C-washing unit, and the liquid outlet of the D12-second sedimentation chamber is connected to the washing liquid inlet of the C-washing unit through the E-drive unit.

[0074] In this embodiment, the number of sedimentation chambers is 2, the washing liquid inlet of the D11-first sedimentation chamber is connected to the washing liquid outlet of the C-washing unit, and the liquid outlet of the D12-second sedimentation chamber is connected to the washing liquid inlet of the C-washing unit through the E-driving unit. Providing two sedimentation chambers in the D-sedimentation unit can further improve the solid impurity removal efficiency of the D-sedimentation unit while reducing the construction cost.

[0075] In one embodiment, the washing device provided by the utility model further includes an A-nitrogen supply unit and a B-reduction unit, and the A-nitrogen supply unit is connected to the replacement gas inlet of the C-washing unit through the B-reduction unit.

[0076] The above-mentioned device can be used to prepare polysilicon. Specifically, the raw materials including hydrogen and silicon trichloride undergo oxidation-reduction reaction in the B-reduction unit to generate silicon element. The utility model does not limit the specific equipment selection of the B-reduction unit. In one embodiment, the B-reduction unit is a B1-reduction furnace. The production process of the B1-reduction furnace is an intermittent operation, and the furnace needs to be opened regularly to unload polysilicon rods and install silicon cores. Before the B1-reduction furnace stops depositing and opens the furnace, it is necessary to use nitrogen from the A-nitrogen supply unit to replace the gas in the B1-reduction furnace multiple times, and the replacement gas (the component is nitrogen including silicon powder) needs to enter the C-washing unit for further processing. The utility model does not limit the specific equipment selection of the A-nitrogen supply unit. In one embodiment, the A-nitrogen supply unit is the A1-plant nitrogen source.

[0077] Figure 5 This is a structural diagram of the fourth washing device provided by the utility model. Figure 5As shown, the washing device provided by the utility model includes not only A-nitrogen supply unit, B-reduction unit, C-washing unit, D-precipitation unit, and E-driving unit connected in sequence, but also F-water replenishment unit, and the replenishment water outlet of the F-water replenishment unit is connected to the replenishment water inlet of the C-washing unit.

[0078] In one embodiment, the washing device provided by the utility model uses water as washing liquid. As the washing process proceeds, the washing liquid is lost, and at this time, the F-water replenishment unit is required to provide additional water as washing liquid. Specifically, the replenishment water from the F-water replenishment unit enters the C-washing unit through the replenishment water inlet of the C-washing unit. The utility model does not limit the specific equipment selection of the F-water replenishment unit, and it only needs to provide washing liquid. In one embodiment, the F-water replenishment unit is the washing water source of the factory area.

[0079] Figure 6 for Figure 5 The equipment diagram of the device shown. Figure 6 As shown, the device includes A1-plant nitrogen source, B1-reduction furnace, C1-washing tower, D1-sedimentation tank, E1-centrifugal pump connected in sequence, and also includes F1-plant washing water source connected to B1-reduction furnace. Among them, C1-washing tower includes C1-washing tower, C11-diversion hose, C12-float, C13-90° elbow pipe fittings, C14-filter, D1-sedimentation tank includes D11-first sedimentation chamber and D12-second sedimentation chamber. Among them, the nominal diameter of C11-diversion hose is DN200, and the volume of C12-float is 0.5m 3 , the precision of C14 filter is 100 mesh.

[0080] During operation, nitrogen from the A-nitrogen supply unit enters the B1-reduction furnace to form replacement gas with silicon powder, and the replacement gas enters the C1-washing tower and is washed by the washing liquid. The washing liquid contacts the replacement gas in the direction of gravity, transfers the silicon powder in the replacement gas to the washing liquid, and the remaining gas of the replacement gas is discharged from the vent outlet at the top of the B1-reduction furnace. The washing liquid carrying silicon powder gathers at the bottom of the C1-washing tower, and the liquid level rises. The free end of the guide hose and the elbow pipe fitting float near the liquid surface under the buoyancy of the float ball. The washing liquid near the liquid surface passes through the C13-90° elbow pipe fitting, C14-filter, and C11-guide hose in turn into the D1-sedimentation tank. In the D1-sedimentation tank, it passes through the D11-first sedimentation chamber and the D12-second sedimentation chamber respectively, and is sent back to the upper part of the C1-washing tower by the E1-centrifugal pump, completing a washing liquid cycle. The precipitated silicon powder can be discharged from the bottom of C1-washing tower, D11-first precipitation chamber and D12-second precipitation chamber.

[0081] The second aspect of the present invention provides a polysilicon production system, which includes any of the above-mentioned washing devices. Since the washing device provided by the present invention has the characteristics of not being easily blocked and having a long continuous operation time, the polysilicon production system provided by the present invention also has the characteristics of not being easily blocked and having a long continuous operation time.

[0082] The washing device provided by the utility model is described in detail below through specific embodiments.

[0083] Example

[0084] This embodiment uses Figure 6 The equipment shown is produced.

[0085] like Figure 6 As shown, the device includes A1-plant nitrogen source, B1-reduction furnace, C1-washing tower, D1-sedimentation tank, E1-centrifugal pump connected in sequence, and also includes F1-plant washing water source connected to B1-reduction furnace. Among them, C1-washing tower includes C11-flow guide hose, C12-float, C13-90° elbow pipe fittings, C14-filter, D1-sedimentation tank includes D11-first sedimentation chamber and D12-second sedimentation chamber. Among them, the nominal diameter of C11-flow guide hose is DN200, and the volume of C12-float is 0.5m 3 , the precision of C14 filter is 100 mesh.

[0086] Among them, A1-plant nitrogen source belongs to A-nitrogen supply unit; B1-reduction furnace belongs to B-reduction unit; C1-washing tower, C11-flow guide hose, C12-float, C13-90° elbow pipe fittings, C14-filter belong to C-washing unit; D1-sedimentation tank, D11-first sedimentation chamber and D12-second sedimentation chamber belong to D-sedimentation unit; E1-centrifugal pump belongs to E-drive unit; F1-plant washing water source belongs to F-water replenishment unit.

[0087] During operation, nitrogen from the A-nitrogen supply unit enters the B1-reduction furnace to form replacement gas with silicon powder, and the replacement gas enters the C1-washing tower and is washed by the washing liquid. The washing liquid contacts the replacement gas in the direction of gravity, transfers the silicon powder in the replacement gas to the washing liquid, and the remaining gas of the replacement gas is discharged from the vent outlet at the top of the B1-reduction furnace. The washing liquid carrying silicon powder gathers at the bottom of the C1-washing tower, and the liquid level rises. The free end of the guide hose and the elbow pipe fitting float near the liquid surface under the buoyancy of the float ball. The washing liquid near the liquid surface passes through the C13-90° elbow pipe fitting, C14-filter, and C11-guide hose in turn into the D1-sedimentation tank. In the D1-sedimentation tank, it passes through the D11-first sedimentation chamber and the D12-second sedimentation chamber respectively, and is sent back to the upper part of the C1-washing tower by the E1-centrifugal pump, completing a washing liquid cycle. The precipitated silicon powder can be discharged from the bottom of C1-washing tower, D11-first precipitation chamber and D12-second precipitation chamber.

[0088] Comparative Example

[0089] The equipment used in this comparative example is Figure 6 They are basically the same, except that there is no guide hose, float, elbow pipe fitting, filter screen, or sedimentation tank in the washing tower, and the washing liquid outlet of the washing tower is directly connected to the centrifugal pump.

[0090] Test example

[0091] The devices of the embodiment and the comparative example were used to produce polysilicon respectively, and the continuous operation time of each device was counted. The data are shown in Table 1.

[0092] Table 1 Continuous operation time data

[0093] Device Continuous operation time (days) Example 30 Comparative Example 7

[0094] It can be seen from Table 1 that the washing device provided by the utility model used in the embodiment has a longer continuous operation time.

[0095] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection 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 this application can be understood according to specific circumstances.

[0096] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the comparative examples of the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of the utility model.

Claims

1. A washing device, characterized in that: It includes a washing unit having a cavity and a driving unit; The washing liquid outlet of the washing unit is connected to the washing liquid inlet of the washing unit through the driving unit, and the washing liquid inlet of the washing unit is at a higher elevation than the washing liquid outlet of the washing unit; The washing unit comprises a washing tower, in which a guide hose comprising a fixed end and a free end is arranged, the fixed end of the guide hose is communicated with a washing liquid outlet of the washing unit, and a float is arranged at the free end of the guide hose.

2. The washing device according to claim 1, characterized in that: The volume of the float is 0.2-0.5m 3 .

3. The washing device according to claim 1, characterized in that: The nominal diameter of the diversion hose is DN50-DN200.

4. The washing device according to claim 1, characterized in that: The washing device further comprises an elbow pipe connected to the free end, wherein the free end of the elbow pipe is directed away from the liquid surface of the washing liquid.

5. The washing device according to claim 4, characterized in that: The angle of the elbow pipe fitting is 90°-135°.

6. The washing device according to claim 5, characterized in that: The angle of the elbow pipe fitting is 90°.

7. The washing device according to claim 6, characterized in that: The free end of the diversion hose is provided with a filter screen with a filtering accuracy of 40-100 meshes.

8. The washing device according to claim 7, characterized in that: The washing device further comprises a settling unit, wherein a washing liquid outlet of the washing unit is connected to a washing liquid inlet of the washing unit through the settling unit and the driving unit in sequence; The precipitation unit comprises N precipitation chambers which are connected in sequence, and at least one precipitation chamber silicon powder discharge port is arranged at the bottom of each precipitation chamber, and N≥2.

9. The washing device according to any one of claims 1 to 8, characterized in that: The washing device further comprises a nitrogen supply unit, a reduction unit and a water replenishment unit. The nitrogen supply unit is connected to the replacement gas inlet of the washing unit through the reduction unit, and the replenishment water outlet of the water replenishment unit is connected to the replenishment water inlet of the washing unit.

10. A polysilicon production system, characterized in that: A washing device comprising the washing device according to any one of claims 1 to 9.

Images