Treatment system for reducing silicon powder in tail gas
Through the combined processing system of filter and gas washing tower, the problem of failure to effectively remove silicon powder in the reducing exhaust gas is solved, and the complete filtering of silicon powder is achieved, which improves the system operation and product purification effect.
Patent Information
- Application Number
- CN202422327940.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-09-24
AI Technical Summary
In the prior art, a small amount of silicon powder is still in the reduced exhaust gas produced during the production of polycrystalline silicon, which fails to effectively remove, resulting in high quality of subsequent system impurities and affecting the product purification effect.
The processing system consisting of a filter, condenser, gas washing tower and separator is used to initially filter the silicon powder through the filter, and then the silicon powder in the exhaust gas is removed by using the hedge form of gas and liquid in the gas washing tower.
The complete filtering and removal of silicon powder from the reduced exhaust gas has been achieved, improving the operating quality of the subsequent system and product purification effect.
Smart Images
Figure CN223159058U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a treatment system for reduction tail gas, and specifically to a treatment system for silicon powder in reduction tail gas. Background Art
[0002] In the process of producing polysilicon, reduction tail gas carrying fine-grained silicon powder is generated. Generally, the amount of silicon powder with a particle size less than 1 micron accounts for 5% of the total carried amount. [[ID=IO]]
[0003] To ensure the normal operation of the system, a filter element with a filtration accuracy of 1 micron is usually used for filtration. However, the interception rate of the filter is 90%, and a small amount of silicon powder still enters the subsequent system, resulting in a high impurity content inside the subsequent system during operation and a decline in the purification effect of the product. Summary of the Utility Model
[0004] Aiming at the technical problem that a small amount of silicon powder still enters the subsequent system after filtering the reduction tail gas, the utility model provides a treatment system for silicon powder in reduction tail gas, which has the advantage of completely filtering the silicon powder in the reduction tail gas.
[0005] The technical solution of the utility model is as follows:
[0006] A treatment system for silicon powder in reduction tail gas, comprising:
[0007] A filter, with reduction tail gas input on one side and filtered tail gas output on the other side;
[0008] A condenser, communicated with the filter;
[0009] A gas scrubbing tower, having a gas inlet communicated with the condenser on the side of the lower half, a gas outlet at the top, a liquid inlet on the side of the upper half, and a liquid outlet at the bottom;
[0010] A separator, communicated with the liquid outlet of the gas scrubbing tower, having a slag outlet at the bottom and a clear liquid outlet at the top;
[0011] Wherein, the gas outlet of the gas scrubbing tower is connected to a compression system.
[0012] Optionally, a plurality of condensers are provided between the filter and the gas scrubbing tower, and a plurality of temperature regulators are also provided between the gas scrubbing tower and the compression system.
[0013] Optionally, the filter element accuracy in the filter is higher than 1 micron.
[0014] Optionally, the gas inlet and the liquid inlet are respectively arranged on both sides of the gas scrubbing tower.
[0015] Optionally, a sprinkling component is provided inside the gas scrubbing tower.
[0016] Optionally, the sprinkler assembly has a number of water outlet holes, and all the water outlet holes are evenly laid in the upper half of the air scrubbing tower.
[0017] Optionally, a water trap is installed on the liquid outlet at the bottom of the air scrubbing tower.
[0018] Optionally, the separator is equipped with a filter element with a filtration accuracy higher than 0.5 microns.
[0019] Optionally, the clear liquid outlet of the separator is connected to a purification system.
[0020] Optionally, the slag outlet of the separator is connected to a concentration system.
[0021] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0022] First, a filter is provided to filter most of the silicon powder in the reduction tail gas, then the reduction tail gas is cooled, and then the reduction tail gas containing a small amount of silicon powder is introduced into the air scrubbing tower, and the reduction tail gas enters the inside of the air scrubbing tower from the bottom of the air scrubbing tower. A liquid inlet is provided at the top of the air scrubbing tower, and then through the countercurrent form of the gas flowing upward and the liquid flowing downward, the silicon powder in the reduction tail gas is removed. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0024] Figure 1 It is a schematic structural diagram of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0025] In the following text, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present utility model. Therefore, the drawings and the description are considered to be exemplary in nature and not restrictive.
[0026] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0027] The following disclosure provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present utility model. In addition, the present utility model may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present utility model provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.
[0028] The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.
[0029] Embodiment:
[0030] See Figure 1 , this embodiment discloses a treatment system for silicon powder in reduction tail gas, including a filter 10, a condenser 20, a gas scrubber 30, and a separator 40. Among them, one end of the conveying pipeline of the reduction tail gas is connected to the input end of the filter 10. In the filter 10, most of the silicon powder in the reduction tail gas is filtered. The reduction tail gas output from the filter 10 is sent into the condenser 20, and the filter element accuracy in the filter 10 is higher than 1 micron.
[0031] The side surface of the lower half of the aforementioned gas scrubber 30 has a gas inlet 31, which is used to connect one end of the gas output from the condenser 20. The top of the gas scrubber 30 has a gas outlet 32, and the side surface of the upper half of the gas scrubber 30 has a liquid inlet 33. At the bottom of the gas scrubber 30, there is a liquid outlet 34.
[0032] A clear liquid (such as clean water) is connected to the liquid inlet 33 of the gas scrubbing tower 30, and the clear liquid is sprayed downward from the top inside the gas scrubbing tower 30. After the clear liquid falls to the bottom of the gas scrubbing tower 30, it converges at the liquid outlet 34 and flows out. A separator 40 is connected to the liquid outlet 34. The separator 40 is provided with a filter element with a filtration accuracy higher than 0.5 microns. A slag outlet 41 is provided at the bottom of the separator 40, and a clear liquid outlet 42 is provided at the top. Among them, the clear liquid outlet 42 of the separator 40 is connected to a purification system, and the slag outlet 41 of the separator 40 is connected to a concentration system. The used clear liquid is purified through the purification system and then recycled, and the silicon powder is recovered and utilized through the concentration system.
[0033] The gas outlet 32 of the gas scrubbing tower 30 is used to output the reduction tail gas after thoroughly removing silicon powder, and the reduction tail gas is introduced into a compression system for subsequent treatment.
[0034] In this embodiment, first, a filter 10 is set to filter most of the silicon powder in the reduction tail gas. Then, the preliminarily filtered reduction gas is introduced into a condenser 20 to cool down the high-temperature reduction tail gas. Then, the reduction tail gas containing a small amount of silicon powder is introduced into the gas scrubbing tower 30, and the reduction tail gas enters the inside of the gas scrubbing tower 30 from the bottom. The purpose of cooling down the high-temperature reduction tail gas is to avoid the clear liquid from evaporating and mixing into the reduction gas after the high-temperature reduction gas contacts the clear liquid. In addition, a liquid inlet 33 is provided at the top of the gas scrubbing tower 30, and then through the counter-flow form of the gas flowing upward and the liquid flowing downward, the silicon powder in the reduction tail gas is removed.
[0035] In one specific embodiment:
[0036] A plurality of condensers 20 are provided between the filter 10 and the gas scrubbing tower 30. The purpose is to cool down the reduction tail gas through the plurality of condensers 20 and shorten the residence time of the reduction tail gas in a single condenser 20, thereby improving the working efficiency of the entire system.
[0037] A plurality of temperature regulators 50 are provided between the gas scrubbing tower 30 and the compression system. The reduction tail gas output from the gas scrubbing tower 30 is temperature-regulated through the temperature regulators 50 to make the reduction tail gas meet the temperature requirements of the compression system.
[0038] In another specific embodiment:
[0039] The gas inlet 31 and the liquid inlet 33 on the gas scrubbing tower 30 are respectively arranged on both sides of the gas scrubbing tower 30. Its working principle is that after the reduced tail gas enters the gas scrubbing tower 30, it will quickly move upward and, under the action of inertia, move to the middle of the gas scrubbing tower 30 and the side close to the liquid inlet 33. After the clear liquid enters the gas scrubbing tower 30 from the liquid inlet 33, it will also move towards the middle of the gas scrubbing tower 30 under the action of inertia. However, since the clear liquid has a large mass, relatively less clear liquid moves to the middle of the gas scrubbing tower 30 and the side close to the gas inlet 31, and most of it will fall on the side close to the liquid inlet 33. Therefore, through the above design, the impact effect between the clear liquid and the reduced tail gas can be improved.
[0040] In another specific embodiment:
[0041] A sprinkling component (not shown in the figure) is provided inside the gas scrubbing tower 30. Specifically, the sprinkling component has a number of water outlet holes, and all the water outlet holes are evenly laid on the upper half inside the gas scrubbing tower 30. By providing the sprinkling component, the clear liquid can be evenly spread inside the gas scrubbing tower 30. Preferably, the clear liquid sprayed out from the water outlet holes can also be in the form of water mist.
[0042] In another specific embodiment:
[0043] A water trap (not shown in the figure) is installed on the liquid outlet 34 at the bottom of the gas scrubbing tower 30. By providing the water trap, the reduced tail gas is prevented from escaping from the liquid outlet 34 of the gas scrubbing tower 30.
[0044] The above-described embodiments only represent the specific implementation manners of the present utility model, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation to the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model.
Claims
1. A treatment system for silicon powder in reduction tail gas, characterized in that, Comprising: A filter, with the reduced tail gas input on one side and the filtered tail gas output on the other side; A condenser, connected to the filter; A gas scrubbing tower, having a gas inlet connected to the condenser on the side of its lower half, a gas outlet at the top, a liquid inlet on the side of its upper half, and a liquid outlet at the bottom; A separator, connected to the liquid outlet of the gas scrubbing tower, having a slag outlet at the bottom and a clear liquid outlet at the top; Wherein, the gas outlet of the gas scrubbing tower is connected to a compression system.
2. The treatment system for silicon powder in the reduced tail gas according to claim 1, characterized in that A plurality of condensers are provided between the filter and the gas scrubbing tower, and a plurality of temperature regulators are also provided between the gas scrubbing tower and the compression system.
3. The treatment system for silicon powder in the reduced tail gas according to claim 1, characterized in that The filter element in the filter has a precision higher than 1 micron.
4. The treatment system for silicon powder in the reduced tail gas according to claim 1, characterized in that The gas inlet and the liquid inlet are respectively provided on both sides of the gas scrubbing tower.
5. The treatment system for silicon powder in the reduced tail gas according to claim 1, characterized in that A sprinkling assembly is provided in the gas scrubbing tower.
6. The treatment system for silicon powder in the reduced tail gas according to claim 5, characterized in that The sprinkling assembly has a number of water outlet holes, and all the water outlet holes are evenly laid in the upper half of the gas scrubbing tower.
7. The treatment system for silicon powder in the reduced tail gas according to claim 1, characterized in that A water trap is installed at the liquid outlet at the bottom of the gas scrubbing tower.
8. The treatment system for silicon powder in the reduced tail gas according to claim 1, characterized in that The separator has a filter element with a precision higher than 0.5 micron.
9. The treatment system for silicon powder in the reduced tail gas according to claim 1, characterized in that The clear liquid outlet of the separator is connected to a purification system.
10. The treatment system for silicon powder in the reduced tail gas according to claim 1, characterized in that The slag outlet of the separator is connected to a concentration system.