Hydrolysis device and polycrystalline silicon production system

Abstract

The utility model relates to the technical field of polycrystalline silicon, and provides a hydrolysis device and a polycrystalline silicon production system.The hydrolysis device comprises at least one hydrolysis tank, at least one liquid level meter assembly and a cleaning structure, and the cleaning structure communicates with a connecting pipeline between the liquid level meter assembly and the hydrolysis tank; the cleaning structure can flush the solid hydrolysate in the connecting pipeline into the hydrolysis tank, and the cleaning structure flushes the connecting pipeline to achieve the effect of dredging the connecting pipeline between the liquid level meter assembly and the hydrolysis tank, so that the problem that the liquid level meter assembly cannot display normally is solved.

Description

Technical Field

[0001] This application relates to the field of polysilicon technology, and in particular to a hydrolysis apparatus and a polysilicon production system. Background Technology

[0002] In the polysilicon production process, slurry is discharged from the distillation section, the recycling section and the cold hydrogen chemical section. The slurry can pollute the environment, so it needs to be hydrolyzed. After the slurry undergoes the hydrolysis reaction, wastewater containing solid hydrolysates is produced.

[0003] To monitor the liquid level inside the hydrolysis tank, a level gauge assembly is installed on one side of the tank. The reading on the level gauge assembly is used to determine whether to add material or discharge wastewater containing solid hydrolysates.

[0004] Because the hydrolysate produced during the hydrolysis process contains solids, after a period of time, the solid hydrolysate can cause blockage in the connecting pipe between the level gauge assembly and the hydrolysis tank, causing the level gauge assembly to be unable to indicate pressure normally, thus affecting the normal operation of determining whether to add material and discharge. Utility Model Content

[0005] This application provides a hydrolysis device and a polysilicon production system to solve the problem that the level gauge assembly cannot display properly due to blockage of the connecting pipeline between the level gauge assembly and the hydrolysis tank.

[0006] On one hand, this application provides a hydrolysis apparatus, comprising:

[0007] At least one hydrolysis tank, the hydrolysis tank having an internal space for accommodating the substance to be hydrolyzed, the hydrolysis tank being adapted to hydrolyze the substance to be hydrolyzed and generate wastewater;

[0008] At least one set of level gauge assemblies, the level gauge assemblies being connected to the hydrolysis tank via connecting pipes; the level gauge assemblies are adapted to display the liquid level inside the hydrolysis tank;

[0009] A cleaning structure is connected to the connecting pipeline; the cleaning structure is adapted to clean solids inside the connecting pipeline.

[0010] This application provides a hydrolysis apparatus, wherein the cleaning structure includes:

[0011] A liquid storage tank, the interior of which is adapted to store liquid;

[0012] A first pipeline is adapted to connect the storage tank and the connecting pipeline; the liquid in the storage tank flushes the solid in the connecting pipeline into the hydrolysis tank through the first pipeline.

[0013] This application provides a hydrolysis apparatus, wherein the cleaning structure further includes:

[0014] A cleaning pump is installed on the first pipeline; the cleaning pump is adapted to drive the liquid in the storage tank to move from the storage tank toward the hydrolysis tank.

[0015] This application provides a hydrolysis device, wherein the connecting pipeline includes a first connecting pipeline and a second connecting pipeline. The first connecting pipeline is adapted to communicate with the hydrolysis tank and form a first detection end on the hydrolysis tank. The second connecting pipeline is adapted to communicate with the hydrolysis tank and form a second detection end on the hydrolysis tank. The level gauge assembly displays the liquid level of the hydrolysis tank through the pressure difference between the first detection end and the second detection end.

[0016] The first pipeline includes:

[0017] A main pipeline, wherein the main pipeline is adapted to be connected to the liquid storage tank;

[0018] At least two branch pipes are provided, and the two branch pipes are respectively connected to the first connecting pipe and the second connecting pipe; the storage tank flushes the solids in the first connecting pipe and the second connecting pipe into the hydrolysis tank through the branch pipes.

[0019] This application provides a hydrolysis device, wherein a wastewater treatment port is provided on one side of the hydrolysis tank, and the wastewater enters the wastewater treatment device through the wastewater treatment port and a wastewater pipeline;

[0020] The cleaning structure also includes:

[0021] The second pipeline is adapted to be connected to the wastewater pipeline and the storage tank, so that the wastewater in the hydrolysis tank flows into the storage tank through the second pipeline;

[0022] A first valve is installed on the second pipeline; the first valve is adapted to control the on / off state of the second pipeline.

[0023] The hydrolysis apparatus provided in this application further includes:

[0024] A filter structure is installed on the second pipeline; the filter structure is adapted to filter the wastewater entering the storage tank.

[0025] The hydrolysis apparatus provided in this application further includes:

[0026] The second valve is located between the wastewater pipeline and the wastewater treatment device at the connection point between the wastewater pipeline and the second pipeline. When the liquid level in the storage tank is a first value, the first valve opens and the second valve closes, allowing the wastewater in the hydrolysis tank to flow to the wastewater treatment device. When the liquid level in the storage tank is a second value, the second valve opens and the first valve closes, allowing the wastewater in the hydrolysis tank to flow to the storage tank.

[0027] The hydrolysis apparatus provided in this application further includes:

[0028] A control structure is provided, which is adapted to monitor the liquid level in the storage tank; the control structure is adapted to control the first valve and the second valve; the control structure includes a first working state and a second working state. When the control structure detects that the liquid level in the storage tank is a first value, the control structure is in the first working state, and the control structure controls the first valve to open and the second valve to close; when the control structure detects that the liquid level in the storage tank is a second value, the control structure is in the second working state, and the control structure controls the second valve to open and the first valve to close.

[0029] On the other hand, this application provides a polysilicon production system, including a processing device and a hydrolysis device as described above, disposed on the processing device.

[0030] This application provides a polysilicon production system, wherein the processing equipment includes a distillation section processing unit, a recycling section processing unit, and a cold hydrogen chemical processing unit.

[0031] This application provides a hydrolysis device and a polysilicon production system, wherein the hydrolysis tank includes at least one hydrolysis tank and at least one set of level gauge components, as well as a cleaning structure. The cleaning structure is connected to the connecting pipe between the level gauge components and the hydrolysis tank. The cleaning structure can clean the solids in the connecting pipe, thereby clearing the connecting pipe between the level gauge components and the hydrolysis tank and solving the problem that the level gauge components cannot display normally. Attached Figure Description

[0032] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0033] Figure 1 A schematic diagram of a hydrolysis device provided in this application.

[0034] Explanation of reference numerals in the attached figures:

[0035] 100. Hydrolysis tank;

[0036] 200. Level gauge assembly; 210. Connecting pipe; 211. First connecting pipe; 212. Second connecting pipe;

[0037] 300. Cleaning structure; 310. Storage tank; 320. First pipeline; 321. Main pipeline; 322. Branch pipeline; 330. Cleaning pump; 340. Second pipeline; 350. Filter structure; 360. First valve;

[0038] 400. Second valve;

[0039] 500. Control structure;

[0040] 600. Wastewater pipelines;

[0041] 700. Wastewater treatment equipment.

[0042] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0043] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0044] First, let me explain the terms used in this application:

[0045] Polysilicon production process: Crude silicon powder from industrial silicon reacts with hydrogen and silicon tetrachloride in a cold hydrogenation synthesis furnace to produce a mixture of dichlorosilane (SiH2Cl2, abbreviated as DCS) and trichlorosilane gas (SiHCl3, abbreviated as TCS). After being separated into crude trichlorosilane in a cold hydrogenation primary separation tower, it is sent to the distillation section. The crude trichlorosilane is purified by distillation and then sent to the reduction furnace. Hydrogen and trichlorosilane react in the reduction furnace, depositing polysilicon at high temperature. The reduction tail gas from the reduction furnace is sent to the tail gas recovery workshop to separate the chlorosilane liquid from the gas. The hydrogen is recycled back to the reduction furnace or the cold hydrogenation synthesis furnace for continued use. The chlorosilane liquid is sent to distillation to separate silicon tetrachloride and trichlorosilane. The silicon tetrachloride is sent to cold hydrogenation again to be converted into crude trichlorosilane, which is then sent back to the reduction furnace to produce polysilicon.

[0046] Slurry: Slurry contains a large amount of heavy metal ions and organic matter. If it is discharged directly without treatment, it will cause serious pollution to soil and water bodies and disrupt the ecological balance. Slurry includes: high boiling point substances, trichlorosilane, silicon tetrachloride, metal chlorides and silicon powder.

[0047] Hydrolysis: Hydrolysis is a chemical unit process that uses water to decompose substances into new substances. In the hydrolysis of slurry, water or a hydrolysis medium is added to cause complex organic or inorganic substances in the slurry to decompose and generate simpler substances. These substances may include soluble salts, gases, precipitates, etc., which facilitate subsequent separation and recovery.

[0048] In order to observe the liquid level in the hydrolysis tank 100 and to determine whether to add materials or discharge wastewater containing hydrolysate based on the liquid level in the hydrolysis tank 100, a liquid level gauge assembly 200 is also installed on one side of the hydrolysis tank 100. The operator can judge the liquid level in the hydrolysis tank 100 by observing the reading of the liquid level gauge assembly 200.

[0049] Because the hydrolysate produced during the hydrolysis process contains solids, after a period of time, the solid hydrolysate will adhere to the inner wall of the connecting pipe 210 between the level gauge assembly 200 and the hydrolysis tank 100. When the solid hydrolysate on the inner wall of the connecting pipe 210 increases, it will cause the connecting pipe 210 to become blocked, thereby causing the level gauge assembly 200 to malfunction. The operator will not be able to judge the liquid level in the hydrolysis tank 100 based on the level gauge assembly 200, thus affecting the operator's normal work in judging whether to add or discharge materials.

[0050] To address the aforementioned issues, this application provides a hydrolysis tank 100, wherein a cleaning structure 300 is connected to a connecting pipe 210 between the level gauge assembly 200 and the hydrolysis tank 100. The cleaning structure 300 can flush the connecting pipe 210 between the level gauge assembly 200 and the hydrolysis tank 100, flushing the solid hydrolysate in the connecting pipe 210 into the hydrolysis tank 100, thereby clearing the connection pipe 210 between the level gauge assembly 200 and the hydrolysis tank 100 and solving the problem that the level gauge assembly 200 cannot display properly.

[0051] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will be described below with reference to the accompanying drawings.

[0052] like Figure 1As shown, in one aspect, the hydrolysis device provided in this application includes at least one hydrolysis tank 100, at least one set of level gauge assemblies 200, and a cleaning structure 300. The hydrolysis tank 100 has an internal space for accommodating the material to be hydrolyzed. The hydrolysis tank 100 is suitable for hydrolyzing the material to be hydrolyzed and generating wastewater. The level gauge assembly 200 is connected to the hydrolysis tank 100 via a connecting pipe 210. The level gauge assembly 200 is suitable for displaying the liquid level inside the hydrolysis tank 100. The cleaning structure 300 is suitable for connecting the level gauge assembly 200 and the hydrolysis tank 100 via the connecting pipe 210. The cleaning structure 300 is suitable for flushing the solid hydrolysate in the connecting pipe 210 into the hydrolysis tank 100, thereby clearing the connecting pipe 210 between the level gauge assembly 200 and the hydrolysis tank 100 and solving the problem of level gauge assembly 200 malfunction. The material to be hydrolyzed is specifically slurry.

[0053] It should be noted that a set of level gauge components 200 includes at least two level gauges. The operator determines whether the level gauge group is malfunctioning by checking whether the readings of multiple level gauges are the same. When the readings of multiple level gauges are inconsistent, it is determined that the level gauge group is malfunctioning. When the readings of multiple level gauges are all the same, the level gauge component 200 is in normal working condition.

[0054] Specifically, the level gauge assembly 200 includes two differential pressure level gauges. The differential pressure level gauges operate on the principle that the hydrostatic pressure of the liquid is proportional to the liquid level. Specifically, the differential pressure level gauge determines the liquid level by measuring the pressure difference between two different heights in the liquid. A differential pressure level gauge typically consists of two pipes connected to the liquid container at different heights. One pipe connects to the bottom of the liquid, and the other connects to a height above the liquid. The liquid pressure is transmitted to the two measuring points of the level gauge, causing a pressure difference between the two measuring points. The differential pressure level gauge determines the liquid level by measuring this pressure difference.

[0055] In this embodiment, there are two hydrolysis tanks 100, and each hydrolysis tank 100 is provided with a level gauge assembly 200. It should be noted that the number of hydrolysis tanks 100 and the number of level gauge assemblies 200 can be reasonably increased or decreased according to actual needs.

[0056] Furthermore, in the hydrolysis apparatus provided in this application embodiment, the cleaning structure 300 includes a storage tank 310 and a first pipeline 320, wherein the storage tank 310 is adapted to store liquid; wherein the first pipeline 320 is adapted to communicate with the storage tank 310 and the connecting pipeline 210; the liquid in the storage tank 310 flushes the solid hydrolysate in the connecting pipeline 210 into the hydrolysis tank body 100 through the first pipeline 320.

[0057] It should be noted that the liquid in the storage tank 310 moves toward the hydrolysis tank 100. During the movement of the liquid in the storage tank 310, it can flush the connecting pipe 210, thereby causing the solid hydrolysate in the connecting pipe 210 to move toward the hydrolysis tank 100, thus achieving the effect of unblocking the connecting pipe 210 between the level gauge assembly 200 and the hydrolysis tank 100.

[0058] Specifically, further, the hydrolysis device provided in this application embodiment includes a cleaning structure 300 that further includes a cleaning pump 330. The cleaning pump 330 is disposed on the first pipeline 320 and is adapted to drive the liquid in the storage tank 310 to move from the storage tank 310 toward the hydrolysis tank 100. By setting the cleaning pump 330, external energy (such as electrical energy, internal combustion engine or wind power) can be converted into mechanical energy, thereby realizing the pumping, lifting, pressurization or transmission of water or other liquids. By setting the cleaning pump 330, the liquid flow rate in the storage tank 310 can be increased, further increasing the flushing effect of the liquid on the connecting pipeline 210, and avoiding the inability of the liquid to be unblocked due to insufficient impact force after the connecting pipeline 210 is blocked.

[0059] In this embodiment, the hydrolysis device provided in this application includes a connecting pipe 210 comprising a first connecting pipe 211 and a second connecting pipe 212. The first connecting pipe 211 is adapted to communicate with the hydrolysis tank 100 and form a first detection end on the hydrolysis tank 100. The second connecting pipe 212 is adapted to communicate with the hydrolysis tank 100 and form a second detection end on the hydrolysis tank 100. The level gauge assembly 200 displays the level of the hydrolysis tank 100 through the pressure difference between the first detection end and the second detection end.

[0060] Specifically, the first pipeline 320 includes a main pipeline 321 and at least two branch pipelines 322, wherein the main pipeline 321 is adapted to be connected to the storage tank 310, and the two branch pipelines 322 are respectively connected to the first connecting pipeline 211 and the second connecting pipeline 212. The storage tank 310 flushes the solids in the first connecting pipeline 211 and the second connecting pipeline 212 into the hydrolysis tank 100 through the branch pipelines 322.

[0061] It should be noted that the first connecting pipe 211 is connected to the bottom of the hydrolysis tank 100, and the second connecting pipe 212 is connected to the top of the hydrolysis tank 100. The level gauge assembly 200 detects the pressure difference between the first detection end and the second detection end inside the hydrolysis tank 100 through the first connecting pipe 211 and the second connecting pipe 212, thereby determining the liquid level of the hydrolysis tank 100. In this application, the first pipe 320 is combined with a main pipe 321 and two branch pipes 322, which can more accurately flush the first connecting pipe 211 and the second connecting pipe 212 to ensure the normal operation of the level gauge assembly 200.

[0062] Furthermore, in the hydrolysis device provided in this application embodiment, a wastewater treatment port is provided on one side of the hydrolysis tank 100, and wastewater enters the wastewater treatment device 700 through the wastewater treatment port wastewater pipe 600; wherein the wastewater treatment device 700 and the wastewater pipe 600 are arranged on one side of the hydrolysis tank 100.

[0063] In this embodiment, the wastewater treatment port is located at the bottom of the hydrolysis tank 100 in order to ensure the discharge effect.

[0064] It should be noted that the wastewater treatment device 700 is generally used to collect and store wastewater. Wastewater generated during the polysilicon production process is generally collected and stored in the wastewater treatment device 700.

[0065] Specifically, the cleaning structure 300 also includes a second pipeline 340 and a first valve 360. The second pipeline 340 is adapted to be connected to the wastewater pipeline 600 and the storage tank 310 so that the wastewater in the hydrolysis tank 100 flows into the storage tank 310 through the second pipeline 340. The first valve 360 ​​is installed on the second pipeline 340 and is adapted to control the opening and closing of the second pipeline 340.

[0066] It should be noted that the wastewater generated in the hydrolysis tank 100 flows into the storage tank 310 through the second pipeline 340. The storage tank 310 then stores the wastewater generated in the hydrolysis tank 100. When the connecting pipeline 210 becomes blocked, the wastewater in the storage tank 310 flows back into the hydrolysis tank 100 through the connecting pipeline 210, thereby realizing the recycling of wastewater in the hydrolysis tank 100. Material recycling and reuse can bring significant economic benefits. Furthermore, the storage tank 310 can also recycle slurry or wastewater generated in other processes.

[0067] Specifically, when the liquid in the storage tank 310 is low, the first valve 360 ​​is opened, and the wastewater generated in the hydrolysis tank 100 flows into the hydrolysis tank 100 through the second pipeline 340. When the hydrolysis tank 100 is full, the first valve 360 ​​is closed.

[0068] Furthermore, the hydrolysis device provided in this application embodiment also includes a filter structure 350, wherein the filter structure 350 is disposed on the second pipeline 340, and the filter structure 350 is adapted to filter the liquid entering the storage tank 310; specifically, the filter structure 350 mainly filters the solid hydrolysates from the wastewater, preventing the solid hydrolysates in the hydrolysis tank 100 from entering the wastewater tank and then flowing back into the connecting pipeline 210 through the first pipeline 320, thereby aggravating the blockage of the connecting pipeline 210.

[0069] It should be noted that the filter structure 350 serves as a solid-liquid separator, filtering out solids from the liquid. Specifically, in this embodiment, the filter structure 350 is a basket filter, named for its precise filter screen structure and basket-like shape. It mainly consists of a connecting pipe, a cylinder, a filter basket, and a flange. The working principle of the basket filter is relatively simple and efficient. When liquid enters the filter basket through the cylinder, solid impurity particles are trapped inside the basket, while the clean fluid passes through and exits through the filter outlet. As filtration progresses, particles accumulate in the basket until cleaning is required. At this point, the fluid can be drained by unscrewing the bottom plug of the main pipe, the flange cover can be removed, and the filter basket can be cleaned. The precise filter screen structure of the basket filter effectively filters out larger solid impurities in the fluid.

[0070] Furthermore, the hydrolysis device provided in this application embodiment also includes a second valve 400, which is disposed between the connection between the wastewater pipeline 600 and the second pipeline 340 and the wastewater treatment device 700; when the liquid level in the storage tank 310 is a first value, the first valve 360 ​​opens and the second valve 400 closes, and the wastewater in the hydrolysis tank 100 flows to the wastewater treatment device 700; when the liquid level in the storage tank 310 is a second value, the second valve 400 opens and the first valve 360 ​​closes, and the wastewater in the hydrolysis tank 100 flows to the storage tank 310.

[0071] It should be noted that the flow direction of wastewater in the hydrolysis tank 100 is controlled by opening and closing the first valve 360 ​​and the second valve 400. The first value is generally the value when the liquid level in the storage tank 310 is low, and the second value is generally the value when the liquid level in the storage tank 310 is high. Specifically, it can be controlled by manual operation. The operator observes the liquid level in the storage tank 310 and controls the flow direction of wastewater in the hydrolysis tank 100 by manually opening and closing the first valve 360 ​​and the second valve 400.

[0072] Furthermore, the hydrolysis device provided in this application embodiment also includes a control structure 500, which is adapted to monitor the liquid level in the storage tank 310; the control structure 500 is adapted to control the first valve 360 ​​and the second valve 400; the control structure 500 includes a first working state and a second working state.

[0073] When the control structure 500 detects that the liquid level in the storage tank 310 is a first value, the control structure 500 is in a first working state, and the control structure 500 controls the first valve 360 ​​to open and the second valve 400 to close; when the control structure 500 detects that the liquid level in the storage tank 310 is a second value, the control structure 500 is in a second working state, and the control structure 500 controls the second valve 400 to open and the first valve 360 ​​to close.

[0074] It should be noted that in this application, the control structure 500 consists of a differential pressure level gauge and a controller. The differential pressure level gauge detects the liquid level in the storage tank 310, and the controller controls the opening and closing of the first valve 360 ​​and the second valve 400 by detecting the liquid level in the storage tank 310.

[0075] On the other hand, an embodiment of this application provides a polysilicon production system, including a processing device and the hydrolysis device described above disposed on the processing device.

[0076] This application provides a polysilicon production system, wherein the processing equipment includes a distillation section processing equipment, a recycling section processing equipment, and a cold hydrogen chemical processing section processing equipment.

[0077] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0078] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A hydrolysis apparatus, characterized in that, include: At least one hydrolysis tank (100) has an internal space for accommodating the substance to be hydrolyzed, and the hydrolysis tank (100) is adapted to hydrolyze the substance to be hydrolyzed and generate wastewater; At least one set of level gauge assemblies (200) are connected to the hydrolysis tank (100) via connecting pipes (210); the level gauge assemblies (200) are adapted to display the liquid level in the hydrolysis tank (100); A cleaning structure (300) is connected to the connecting pipe (210); the cleaning structure (300) is adapted to clean solids in the connecting pipe (210).

2. The hydrolysis apparatus according to claim 1, characterized in that, The cleaning structure (300) includes: A liquid storage tank (310), the interior of which is adapted to store liquid; A first pipeline (320) is adapted to connect the storage tank (310) and the connecting pipeline (210); the liquid in the storage tank (310) flushes the solid in the connecting pipeline (210) into the hydrolysis tank (100) through the first pipeline (320).

3. The hydrolysis apparatus according to claim 2, characterized in that, The cleaning structure (300) also includes: A cleaning pump (330) is provided on the first pipeline (320); the cleaning pump (330) is adapted to drive the liquid in the storage tank (310) to move from the storage tank (310) toward the hydrolysis tank (100).

4. The hydrolysis apparatus according to claim 2, characterized in that, The connecting pipe (210) includes a first connecting pipe (211) and a second connecting pipe (212). The first connecting pipe (211) is adapted to communicate with the hydrolysis tank (100) and form a first detection end on the hydrolysis tank (100). The second connecting pipe (212) is adapted to communicate with the hydrolysis tank (100) and form a second detection end on the hydrolysis tank (100). The level gauge assembly (200) displays the level of the hydrolysis tank (100) through the pressure difference between the first detection end and the second detection end. The first conduit (320) includes: Main pipeline (321), said main pipeline (321) being adapted to communicate with said liquid storage tank (310); At least two branch pipes (322) are connected to the first connecting pipe (211) and the second connecting pipe (212) respectively; the storage tank (310) flushes the solids in the first connecting pipe (211) and the second connecting pipe (212) into the hydrolysis tank (100) through the branch pipes (322).

5. The hydrolysis apparatus according to any one of claims 2-4, characterized in that, The hydrolysis tank (100) has a wastewater treatment port on one side, and the wastewater enters the wastewater treatment device (700) through the wastewater treatment port and the wastewater pipeline (600); The cleaning structure (300) also includes: A second pipeline (340) is adapted to be connected to the wastewater pipeline (600) and the storage tank (310) so that the wastewater in the hydrolysis tank (100) flows into the storage tank (310) through the second pipeline (340); A first valve (360) is disposed on the second pipeline (340); the first valve (360) is adapted to control the opening and closing of the second pipeline (340).

6. The hydrolysis apparatus according to claim 5, characterized in that, Also includes: A filter structure (350) is provided on the second pipeline (340); the filter structure (350) is adapted to filter the wastewater entering the storage tank (310).

7. The hydrolysis apparatus according to claim 5, characterized in that, Also includes: The second valve (400) is located between the wastewater pipeline (600) and the second pipeline (340) and the wastewater treatment device (700). When the liquid level in the storage tank (310) is a first value, the first valve (360) opens and the second valve (400) closes, and the wastewater in the hydrolysis tank (100) flows to the wastewater treatment device (700). When the liquid level in the storage tank (310) is a second value, the second valve (400) opens and the first valve (360) closes, and the wastewater in the hydrolysis tank (100) flows to the storage tank (310).

8. The hydrolysis apparatus according to claim 7, characterized in that, Also includes: A control structure (500) adapted to monitor the liquid level in the storage tank (310); The control structure (500) is adapted to control the first valve (360) and the second valve (400); the control structure (500) includes a first working state and a second working state. When the control structure (500) detects that the liquid level in the storage tank (310) is a first value, the control structure (500) is in the first working state, and the control structure (500) controls the first valve (360) to open and the second valve (400) to close; when the control structure (500) detects that the liquid level in the storage tank (310) is a second value, the control structure (500) is in the second working state, and the control structure (500) controls the second valve (400) to open and the first valve (360) to close.

9. A polycrystalline silicon production system, characterized in that, It includes a processing device and a hydrolysis device according to any one of claims 1-8 disposed on the processing device.

10. The polycrystalline silicon production system according to claim 9, characterized in that, The processing unit includes a distillation section, a recovery section, and a cold hydrogen chemical processing section.

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